阅读说明：本技术 一种避偏轴的窄幅同步变形轮滑鞋 (Narrow width synchronous deformation roller skate capable of avoiding eccentric shaft ) 是由 卢伟 刘尊波 姚嘉 曾婉琳 吴其汉 邱茂昌 姚远东 于 2021-09-18 设计创作，主要内容包括：一种避偏轴的窄幅同步变形轮滑鞋。现有的轮滑鞋中触发变形的位置易与轮滑动作相冲突,导致轮滑过程中因偶发误触而引起轮滑运动事故,因鞋体变形性能使其控制重量大且同轴位置的两个轮体间距大,导致偏轴问题严重且难以避免。本发明包括鞋底架、旋钮、方形杆、两个内置控制组件、两个前长杆、两个后长杆、两个长杆用轮体、两个前短杆、两个后短杆和两个短杆用轮体,所述鞋底架水平设置,鞋底架沿其宽度方向的纵向截面形状为匚字形,两个内置控制组件分别设置在鞋底架的两侧内壁上,方形杆沿鞋底架的宽度方向穿设在鞋底架内,方形杆的一端与鞋底架的一侧内壁相铰接,方形杆的另一端穿过鞋底架的另一侧壁后与旋钮相连接。(A narrow width synchronous deformation roller skate capable of avoiding deviation of a shaft. The position of triggering deformation in the existing roller skate is easy to conflict with roller skating action, so that roller skating accidents are caused due to accidental mistaken triggering in the roller skating process, and the problem of off-axis is serious and difficult to avoid due to the fact that the deformation performance of a shoe body enables the control weight of the shoe body to be large and the distance between two wheel bodies in the coaxial position to be large. The shoe comprises a shoe sole frame, a knob, a square rod, two built-in control assemblies, two front long rods, two rear long rods, two long rod wheel bodies, two front short rods, two rear short rods and two short rod wheel bodies, wherein the shoe sole frame is horizontally arranged, the longitudinal section of the shoe sole frame along the width direction of the shoe sole frame is Contraband-shaped, the two built-in control assemblies are respectively arranged on the inner walls of the two sides of the shoe sole frame, the square rod penetrates through the shoe sole frame along the width direction of the shoe sole frame, one end of the square rod is hinged with the inner wall of one side of the shoe sole frame, and the other end of the square rod penetrates through the other side wall of the shoe sole frame and then is connected with the knob.)

1. The utility model provides a narrow width synchronous deformation roller skate of aversion axle which characterized in that: the shoe sole comprises a shoe sole frame (1), a knob (2), a square rod (3), two built-in control assemblies, two front long rods (11), two rear long rods (12), two wheel bodies (13) for the long rods, two front short rods (14), two rear short rods (15) and two wheel bodies (16) for the short rods, wherein the shoe sole frame (1) is horizontally arranged, the longitudinal section of the shoe sole frame (1) in the width direction is Contraband-shaped, the two built-in control assemblies are respectively arranged on the inner walls of the two sides of the shoe sole frame (1), the square rod (3) penetrates through the shoe sole frame (1) in the width direction of the shoe sole frame (1), one end of the square rod (3) is hinged to one side inner wall of the shoe sole frame (1), and the other end of the square rod (3) penetrates through the other side wall of the shoe sole frame (1) and then is connected with the knob (2);

the two front long rods (11) and the two rear long rods (12) are arranged in the shoe sole frame (1) in parallel, one end of each front long rod (11) and one end of each rear long rod (12) are respectively hinged to the middle part of the shoe sole frame (1), one wheel body (13) for one long rod in the two wheel bodies (13) for the long rods is hinged between the other ends of the two front long rods (11), and the other wheel body (13) for the other long rod in the two wheel bodies (13) for the long rods is hinged between the other ends of the two rear long rods (12);

the upper ends of the two front short rods (14) are hinged to the front end of the sole frame (1), one short rod wheel body (16) of the two short rod wheel bodies (16) is hinged between the lower ends of the two front short rods (14), the upper ends of the two rear short rods (15) are hinged to the rear end of the sole frame (1), and the other short rod wheel body (16) of the two short rod wheel bodies (16) is hinged between the lower ends of the two rear short rods (15);

the square rod (3) is respectively connected with two built-in control components through a connecting rod component, and each built-in control component is hinged with a front long rod (11), a rear long rod (12), a front short rod (14) and a rear short rod (15) which are close to the built-in control component.

2. The narrow width synchronous deformation roller skate of claim 1, characterized in that: each built-in control component comprises a front Contraband-shaped connecting block (4) and a rear Contraband-shaped connecting block (5), the front Contraband-shaped connecting block (4) and the rear Contraband-shaped connecting block (5) are respectively arranged on the inner side wall of the sole frame (1), the front Contraband-shaped connecting block (4) is in sliding fit with the inner side wall of the sole frame (1), the rear Contraband-shaped connecting block (5) is in sliding fit with the inner side wall of the sole frame (1), the front Contraband-shaped connecting block (4) and the rear Contraband-shaped connecting block (5) are identical in structure, the rear Contraband-shaped connecting block (5) comprises a rear upper cross bar (5-1), a rear middle vertical bar (5-2), a rear lower cross bar (5-3) and a rear extension bar (5-4), the rear middle vertical bar (5-2) is vertically arranged, the rear upper cross bar (5-1) and the rear lower cross bar (5-3) are sequentially arranged on one side of the rear middle vertical bar (5-2) from top to bottom along the length direction of the sole frame (1), the shoe frame comprises a rear upper cross rod (5-1), a rear middle vertical rod (5-2) and a rear lower cross rod (5-3), wherein the rear upper cross rod (5-1), the rear middle vertical rod (5-2) and the rear lower cross rod (5-3) are fixedly connected into a whole, a first opening (5-5) is formed by enclosing the rear upper cross rod (5-1), the rear middle vertical rod (5-2) and the rear lower cross rod (5-3), a first hinged raised head (23) and a second hinged raised head (24) are arranged on one side surface, facing the inside of the shoe frame (1), of the rear middle vertical rod (5-2) from top to bottom, the length direction of the rear extension rod (5-4) is the same as that of the rear lower cross rod (5-3), and one end of the rear extension rod (5-4) is fixedly connected with the end of the rear lower cross rod (5-3).

3. The narrow width synchronous deformation roller skate of claim 2, characterized in that: the two rear long rods (12) are provided with a first rotating shaft (25), a second rotating shaft (26) and a third rotating shaft (27) in a matching way, the first rotating shaft (25) and the second rotating shaft (26) are both arranged in the sole frame (1) in a penetrating way, two ends of the first rotating shaft (25) are respectively hinged with two side walls of the sole frame (1), one end of each of the two rear long rods (12) is fixedly sleeved on the first rotating shaft (25), the second rotating shaft (26) is positioned below the first rotating shaft (25), each end of the second rotating shaft (26) penetrates through a first gap (5-5) of a rear Contraband-shaped connecting block (5) close to the end of the second rotating shaft and then is hinged with the side wall of the sole frame (1), the middle parts of two rear long rods (12) are fixedly sleeved on the second rotating shaft (26), a third rotating shaft (27) is arranged between the lower ends of the two rear long rods (12), and the third rotating shaft (27) is sleeved with the wheel body (13) for the other long rod in the two wheel bodies (13) for the long rods;

the two rear short rods (15) are provided with a fourth rotating shaft (28), a fifth rotating shaft (29) and a sixth rotating shaft (30) in a matching way, the fourth rotating shaft (28) and the fifth rotating shaft (29) are both arranged in the sole frame (1) in a penetrating way, two ends of the fourth rotating shaft (28) are respectively hinged with two side walls of the sole frame (1), the upper ends of the two rear short rods (15) are fixedly sleeved on the fourth rotating shaft (28), fifth pivot (29) are in the below of fourth pivot (28), and fifth pivot (29) cooperate with back extension bar (5-4), and the both ends of fifth pivot (29) are articulated mutually with the both sides wall of sole frame (1) respectively, and the middle part of two back quarter butt (15) is all fixed the suit on fifth pivot (29), is provided with sixth pivot (30) between the lower extreme of two back quarter butt (15), and the cover is equipped with another in two quarter butt wheel bodies (16) on sixth pivot (30) the quarter butt is with wheel body (16).

4. The narrow width synchronous deformation roller skate of claim 2, characterized in that: two rear elastic control pieces are arranged between the two rear short rods (15) and the two rear long rods (12) in a matched mode, the rear short rods (15) and the rear long rods (12) are arranged in a one-to-one corresponding mode, each rear short rod (15) is arranged close to the corresponding rear long rod (12), the outer walls of the two sides of the sole frame (1) are respectively provided with one rear elastic control piece, each rear elastic control piece comprises an extension spring (31) and a flat connecting rod (32), the middle of the outer side wall of the sole frame (1) is provided with a bulge (33), the bulge (33) is arranged close to the bottom of the sole frame (1), the two ends of the flat connecting rod (32) are sleeved on the fifth rotating shaft (29) and the second rotating shaft (26), one end of the extension spring (31) is detachably connected to the bulge (33), the other end of the extension spring (31) is sleeved on the second rotating shaft (26), and a long hole is machined in the thickness direction of the flat connecting rod (32); two front elastic control pieces are arranged between the two front short rods (14) and the two front long rods (11) in a matched mode, the outer walls of the two sides of the sole frame (1) are respectively provided with one front elastic control piece, and the structure of each front elastic control piece is the same as that of each rear elastic control piece.

5. The narrow width synchronous deformation roller skate of claim 2, characterized in that: a first placing groove (34) and a second placing groove (35) are formed in the inner side wall of the sole frame (1), the first placing groove (34) and the second placing groove (35) are sequentially arranged along the length direction of the sole frame (1), the shape of the first placing groove (34) is matched with that of a front Contraband-shaped connecting block (4), the shape of the second placing groove (35) is matched with that of a rear Contraband-shaped connecting block (5), the front Contraband-shaped connecting block (4) is arranged in the first placing groove (34), the opening end of the front Contraband-shaped connecting block (4) is arranged towards the front end of the sole frame (1), and the front Contraband-shaped connecting block (4) slides in a reciprocating mode along the length direction of the first placing groove (34); the rear Contraband-shaped connecting block (5) is arranged in the second placing groove (35), the opening end of the rear Contraband-shaped connecting block (5) faces the rear end of the sole frame (1) and is arranged, the rear Contraband-shaped connecting block (5) slides in a reciprocating mode along the length direction of the second placing groove (35), a first arc-shaped hole (36) and a second arc-shaped hole (37) are machined in the side wall of the sole frame (1), the first arc-shaped hole (36) and the second arc-shaped hole (37) are respectively communicated with the second placing groove (35), the first arc-shaped hole (36) is separated through a rear upper cross rod (5-1) to form a first hole site (6) and a second hole site (7), the first hole site (6) and the second hole site (7) are respectively matched with the second rotating shaft (26), the second arc-shaped hole (37) is separated through a rear extension rod (5-4) to form a third hole site (8) and a fourth hole site (9), and the third hole site (8) and the fourth hole site (9) are respectively matched with the fifth rotating shaft (29).

6. The narrow width synchronous deformation roller skate of claim 2, characterized in that: the connecting rod assembly comprises a connecting main rod (10-1), two connectors (10-2) and four auxiliary rods (10-3), the connecting main rod (10-1) is arranged in the sole frame (1), the length direction of the connecting main rod (10-1) is in the same direction with the width direction of the sole frame (1), the two connectors (10-2) are respectively sleeved on the connecting main rod (10-1), each connector (10-2) is correspondingly provided with two auxiliary rods (10-3), each connector (10-2) is respectively hinged with the corresponding two auxiliary rods (10-3), one auxiliary rod (10-3) in the two auxiliary rods (10-3) is hinged with a first hinged raised head (23) of a front Contraband-shaped connecting block (4), and the other auxiliary rod (10-3) in the two auxiliary rods (10-3) is hinged with a second hinged raised head (24) of a rear Contraband-shaped connecting block (5) The square rod (3) is hinged with one end of the connecting main rod (10-1).

7. The narrow width synchronous deformation roller skate of claim 1, characterized in that: the two front long rods (11) are arranged in the sole frame (1) in parallel, the distance between the two front long rods (11) is smaller than the width of the sole frame (1), the two front short rods (14) are arranged in the sole frame (1) in parallel, the two front short rods (14) are positioned between the two front long rods (11), and the distance between the two front short rods (14) is smaller than the distance between the two front long rods (11); two back stock (12) set up side by side in sole frame (1), and the distance between two back stock (12) is less than the width of sole frame (1), and two back quarter butt (15) set up side by side in sole frame (1), and two back quarter butt (15) are in between two back stock (12), and the distance between two back quarter butt (15) is less than the distance between two back stock (12).

8. The narrow width synchronous deformation skidding shoe of any one of claims 1 to 7, wherein: processing has first bellying (18) on every preceding stock (11), processing has second bellying (19) on every back stock (12), two preceding stocks (11), two back stocks (12), two preceding quarter butt (14) and two back quarter butt (15) are the flat body of rod, processing has a plurality of first lightening holes (38) along its thickness direction in every preceding stock (11), processing has a plurality of second lightening holes (39) along its thickness direction in every back stock (12), processing has third lightening hole (40) along its thickness direction in every preceding quarter butt (14), processing has fourth lightening hole (41) along its thickness direction in every back quarter butt (15).

9. The narrow width synchronous deformation roller skate of claim 1, characterized in that: the shoe sole frame (1) comprises a first composition side cover (1-1), a second composition side cover (1-2) and a top cover (1-3), the first composition side cover (1-1) and the second composition side cover (1-2) are vertically arranged in parallel, a first groove is processed on one side, facing the second composition side cover (1-2), of the first composition side cover (1-1), a second groove is processed on one side, facing the first composition side cover (1-1), of the second composition side cover (1-2), the top cover (1-3) is horizontally arranged between the first composition side cover (1-1) and the second composition side cover (1-2), and two sides of the top cover (1-3) are detachably connected with the first composition side cover (1-1) and the second composition side cover (1-2) respectively.

The technical field is as follows:

the invention relates to a narrow synchronous deformation roller skate capable of avoiding deviation of an axle, and belongs to the technical field of sports goods.

Background art:

compared with a double-row roller skate, the single-row roller skate has obvious advantages, when the single-row roller skate is used, the matching structure of the using state of the common skate and the using state of the roller skate is complex when the using state of the single-row roller skate is changed, the roller skate is easy to be clamped in the deformation process, the roller is required to be directly operated by hands when the roller skate is not completely opened, the operation is clumsy and easily hurt the hands, a small number of products are shoes which have the using characteristics of common walking shoes and roller skates, because the related matching control structure is not reasonable enough in the using state of the roller skate, the unfolding or folding actions of a plurality of roller bodies are difficult to be simultaneously carried out, and because the triggering positions are more at the heel part of the shoe body, the control structure is complex, the quick recovery stability in the unfolding or folding process is poor, and simultaneously, when the related actions that the rear root part is attached to the ground are involved, the roller skate is easy to mistakenly touch a switch to cause the folding actions of each roller body, influence the performance of roller skate, can threaten user's health safety even, in addition, because of the deformation gesture of deformation roller skate is various for corresponding control structure weight is big, and two wheel body intervals that are in the coaxial position still can lead to the off-axis problem greatly, and the off-axis problem can seriously make the stability of shoes body when using difficult to guarantee, not only uses the travelling comfort to reduce, still can cause the skidding motion accident, also has adverse effect to the development of the correct action custom of sliding of roller skate.

The invention content is as follows:

in order to solve the problems mentioned in the background art, the invention aims to provide a narrow width synchronous deformation roller skate capable of avoiding deviation.

A narrow width synchronous deformation roller skate for avoiding an offset shaft comprises a sole frame, a knob, a square rod, two built-in control assemblies, two front long rods, two rear long rods, wheel bodies for the two long rods, two front short rods, two rear short rods and wheel bodies for the two short rods, wherein the sole frame is horizontally arranged, the longitudinal section of the sole frame in the width direction is Contraband-shaped, the two built-in control assemblies are respectively arranged on the inner walls of the two sides of the sole frame, the square rod penetrates through the sole frame in the width direction, one end of the square rod is hinged with the inner wall of one side of the sole frame, and the other end of the square rod penetrates through the other side wall of the sole frame and is connected with the knob;

the two front long rods and the two rear long rods are arranged in the shoe sole frame in parallel, one end of each front long rod and one end of each rear long rod are respectively hinged to the middle part of the shoe sole frame, one wheel body for the long rods in the two wheel bodies for the long rods is hinged between the other ends of the two front long rods, and the other wheel body for the long rods in the two wheel bodies for the long rods is hinged between the other ends of the two rear long rods;

the upper ends of the two front short rods are hinged to the front end of the sole frame, one of the two short rod wheel bodies is hinged between the lower ends of the two front short rods, the upper ends of the two rear short rods are hinged to the rear end of the sole frame, and the other of the two short rod wheel bodies is hinged between the lower ends of the two rear short rods;

the square rod is respectively connected with two built-in control components through a connecting rod component, and each built-in control component is hinged with a front long rod, a rear long rod, a front short rod and a rear short rod which are close to the built-in control component.

Compared with the prior art, the invention has the beneficial effects that:

the shoe comprises a shoe bottom frame, a knob, a square rod, two built-in control assemblies, two front long rods, two rear long rods, two front short rods and two rear short rods, wherein the two front long rods and the two rear long rods are matched with each other to realize the synchronous unfolding or folding process of the wheel bodies for the two long rods and the wheel bodies for the two short rods.

The rotary knob, the square rod, the connecting rod assembly and the two built-in control assemblies are matched to realize synchronous unfolding or folding actions of the wheel bodies for the two long rods and the wheel bodies for the two short rods, the folding actions of the wheel bodies for the long rods and the wheel bodies for the short rods are unified, and the rolling heights of the wheel bodies for the long rods and the wheel bodies for the short rods after being unfolded and released are also unified.

In the invention, each component in the knob, the square rod and the two built-in control assemblies moves in a preset track, so that the occurrence of unconstrained free components is avoided, and the stability and smoothness of folding or unfolding actions of the invention are ensured.

Fourthly, the invention realizes that a single screwing external force simultaneously controls the square rod, the two built-in control components, the two front long rods, the two rear long rods, the wheel bodies for the two long rods, the two front short rods, the two rear short rods and the two wheel bodies for the short rods to fold or unfold, so that the screwing force of the knob is more stable in transmission.

And fifthly, the width of the shoe frame is narrowed through the mutual matching of the two front long rods, the two rear long rods, the two front short rods and the two rear short rods which are arranged in the shoe frame, the weight of the whole structure can be reduced through the narrow structural form, and the shoe frame is small and compact in structure and free of off-axis phenomenon.

Description of the drawings:

for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.

FIG. 1 is a schematic front view of the present invention in the extended limit state;

FIG. 2 is a schematic top view of the present invention at the limit of deployment;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is an enlarged view of the structure at C in FIG. 4;

FIG. 6 is a schematic view of a first three-dimensional configuration of the present invention at the limit of deployment;

FIG. 7 is a schematic view of a second perspective view of the present invention in the extended limit condition;

FIG. 8 is a third perspective view of the present invention at the limit of deployment;

FIG. 9 is a schematic perspective view of the present invention at the closed limit;

FIG. 10 is a schematic perspective view of the connection between the knob, the square rod, the connecting rod assembly and the built-in control assembly;

in the drawings, 1-shoe sole frame; 1-1-a first composition side cover; 1-2-a second composition side cover; 1-3-top cover; 2-a knob; 3-a square rod; 4-front Contraband-shaped connecting block; 5-rear Contraband-shaped connecting blocks; 5-1-rear upper cross bar; 5-2-rear middle vertical bar; 5-3-rear bottom rail; 5-4-rear extension bar; 6-first hole site; 7-second hole site; 8-third hole site; 9-fourth hole site; 10-1-connecting the main rod; 10-2-connector; 10-3-subsidiary rod; 11-front long rod; 12-rear long rod; 13-wheel body for long rod; 14-front short bar; 15-rear short bar; 16-wheel body for short rod; 17-strip-shaped convex ribs; 18-a first boss; 19-a second boss; 23-a first hinge nose; 24-a second hinge projection; 25-a first shaft; 26-a second shaft; 27-a third shaft; 28-a fourth rotating shaft; 29-a fifth rotating shaft; 30-a sixth rotating shaft; 31-an extension spring; 32-flat bar for connection; 33-protrusions; 34-a first placing groove; 35-a second holding groove; 36-a first arcuate aperture; 37-a second arcuate aperture; 38-a first lightening hole; 39-second lightening holes; 40-a third lightening hole; 41-fourth lightening holes; 42-return spring.

The specific implementation mode is as follows:

in order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.

The first embodiment is as follows: as shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10, the present embodiment adopts the following technical solutions, including a sole frame 1, a knob 2, a square rod 3, two built-in control components, two front long rods 11, two rear long rods 12, two wheel bodies for long rods 13, two front short rods 14, two rear short rods 15 and two wheel bodies for short rods 16, wherein the sole frame 1 is horizontally arranged, the longitudinal cross-sectional shape of the sole frame 1 along the width direction thereof is Contraband-shaped, the two built-in control components are respectively arranged on the inner walls of both sides of the sole frame 1, the square rod 3 is penetrated in the sole frame 1 along the width direction of the sole frame 1, one end of the square rod 3 is hinged with one inner wall of the sole frame 1, and the other end of the square rod 3 is connected with the knob 2 after penetrating through the other side wall of the sole frame 1;

two front long rods 11 and two rear long rods 12 are arranged in parallel in the shoe sole frame 1, one end of each front long rod 11 and one end of each rear long rod 12 are respectively hinged to the middle part of the shoe sole frame 1, one wheel body 13 for one long rod in two wheel bodies 13 for the long rods is hinged between the other ends of the two front long rods 11, and the other wheel body 13 for the other long rod in the two wheel bodies 13 for the long rods is hinged between the other ends of the two rear long rods 12;

the upper ends of the two front short rods 14 are hinged to the front end of the sole frame 1, one short rod wheel body 16 of the two short rod wheel bodies 16 is hinged between the lower ends of the two front short rods 14, the upper ends of the two rear short rods 15 are hinged to the rear end of the sole frame 1, and the other short rod wheel body 16 of the two short rod wheel bodies 16 is hinged between the lower ends of the two rear short rods 15;

the square rod 3 is respectively connected with two built-in control components through a connecting rod component, and each built-in control component is hinged with a front long rod 11, a rear long rod 12, a front short rod 14 and a rear short rod 15 which are close to the built-in control component.

In the embodiment, the knob 2 performs a screwing action to drive the two front long rods 11, the two front short rods 14, the two rear long rods 12 and the two rear short rods 15 to synchronously unfold or fold through the two built-in control components, so as to drive the two wheel bodies 13 for the long rods and the two wheel bodies 16 for the short rods to synchronously release or fold. Two preceding stock 11 and two preceding quarter butt 14 constitute preceding double-wheel supporting component, and two back stock 12 and two back quarter butt 15 constitute back double-wheel supporting component, and preceding double-wheel supporting component is unanimous with the action change state of back double-wheel supporting component.

A plurality of lightening holes are respectively formed on two side walls of the sole frame 1 in the embodiment, and are used for lightening the weight of the sole frame 1. The lightening holes are triangular, so that the influence of the holes on the stability of the sole frame 1 is reduced.

The second embodiment is as follows: the embodiment is further limited by the first specific embodiment, each built-in control assembly comprises a front Contraband-shaped connecting block 4 and a rear Contraband-shaped connecting block 5, the front Contraband-shaped connecting block 4 and the rear Contraband-shaped connecting block 5 are respectively arranged on the inner side wall of the sole frame 1, the front Contraband-shaped connecting block 4 is in sliding fit with the inner side wall of the sole frame 1, the rear Contraband-shaped connecting block 5 is in sliding fit with the inner side wall of the sole frame 1, the front Contraband-shaped connecting block 4 and the rear Contraband-shaped connecting block 5 are in the same structure, the rear Contraband-shaped connecting block 5 comprises a rear upper cross bar 5-1, a rear middle vertical bar 5-2, a rear lower cross bar 5-3 and a rear extension bar 5-4, the rear middle vertical bar 5-2 is vertically arranged, the rear upper cross bar 5-1 and the rear lower cross bar 5-3 are sequentially arranged on one side of the rear middle vertical bar 5-2 from top to bottom along the length direction of the sole frame 1, the rear upper cross rod 5-1, the rear middle vertical rod 5-2 and the rear lower cross rod 5-3 are fixedly connected into a whole, a first gap 5-5 is formed among the rear upper cross rod 5-1, the rear middle vertical rod 5-2 and the rear lower cross rod 5-3 in a surrounding mode, a first hinged raised head 23 and a second hinged raised head 24 are arranged on one side face, facing the inside of the sole frame 1, of the rear middle vertical rod 5-2 from top to bottom, the length direction of the rear extension rod 5-4 is the same as that of the rear lower cross rod 5-3, and one end of the rear extension rod 5-4 is fixedly connected with the end portion of the rear lower cross rod 5-3.

The third concrete implementation mode: the present embodiment is further limited to the first or second embodiment, in which the two rear long rods 12 are provided with a first rotating shaft 25, a second rotating shaft 26 and a third rotating shaft 27, the first rotating shaft 25 and the second rotating shaft 26 are both arranged in the sole frame 1 in a penetrating way, both ends of the first rotating shaft 25 are respectively hinged with both side walls of the sole frame 1, one end of each of the two rear long rods 12 is fixedly sleeved on the first rotating shaft 25, the second rotating shaft 26 is positioned below the first rotating shaft 25, each end of the second rotating shaft 26 penetrates through a first gap 5-5 of the rear Contraband-shaped connecting block 5 close to the end and then is hinged with the side wall of the sole frame 1, the middle parts of the two rear long rods 12 are fixedly sleeved on the second rotating shaft 26, a third rotating shaft 27 is arranged between the lower ends of the two rear long rods 12, and the third rotating shaft 27 is sleeved with the wheel body 13 for the other long rod in the wheel bodies 13 for the two long rods;

two back quarter butt 15 cooperations are provided with fourth pivot 28, fifth pivot 29 and sixth pivot 30, fourth pivot 28 and fifth pivot 29 all wear to establish the inside at sole frame 1, the both ends of fourth pivot 28 are articulated mutually with the both sides wall of sole frame 1 respectively, and the equal fixed suit in fourth pivot 28 of upper end of two back quarter butts 15, fifth pivot 29 is in the below of fourth pivot 28, and fifth pivot 29 cooperatees with back extension bar 5-4, and the both ends of fifth pivot 29 are articulated mutually with the both sides wall of sole frame 1 respectively, and the middle part of two back quarter butts 15 is all fixed the cover and is adorned on fifth pivot 29, is provided with sixth pivot 30 between the lower extreme of two back quarter butts 15, and the cover is equipped with another in two quarter butt wheel bodies 16 on the sixth pivot 30 another the quarter butt wheel body 16.

In this embodiment, the first rotation shaft 25 is a rotation shaft of the rear long rod 12, and the first rotation shaft 25 is hinged to both side walls of the sole frame 1 and is used as a rotation point of the rear long rod 12. The fourth rotating shaft 28 is a rotating shaft of the rear short rod 15, and the fourth rotating shaft 28 is hinged with two side walls of the sole frame 1 and is used as a rotating point of the rear short rod 15. Similarly, the front long rod 11 is correspondingly provided with another first rotating shaft 25, the first rotating shaft 25 provides a fixed-point rotating effect for the front long rod 11, and the front short rod 14 is correspondingly provided with another fourth rotating shaft 28, and the fourth rotating shaft 28 provides a fixed-point rotating effect for the front short rod 14.

The fourth concrete implementation mode: the present embodiment is a first embodiment of the present invention, two rear elastic control pieces are arranged between the two rear short rods 15 and the two rear long rods 12 in a matched mode in the embodiment, the rear short rods 15 and the rear long rods 12 are arranged in a one-to-one correspondence mode, each rear short rod 15 is arranged close to the corresponding rear long rod 12, the outer walls of the two sides of the sole frame 1 are respectively provided with one rear elastic control piece, each rear elastic control piece comprises an extension spring 31 and a flat connecting rod 32, the middle part of the outer side wall of the sole frame 1 is provided with a bulge 33, the bulge 33 is arranged close to the bottom of the sole frame 1, the two ends of the flat connecting rod 32 are sleeved on the fifth rotating shaft 29 and the second rotating shaft 26, one end of the extension spring 31 is detachably connected to the bulge 33, the other end of the extension spring 31 is sleeved on the second rotating shaft 26, and a long hole is machined in the thickness direction of the flat connecting rod 32; two front elastic control pieces are arranged between the two front short rods 14 and the two front long rods 11 in a matching manner, the outer walls of the two sides of the sole frame 1 are respectively provided with one front elastic control piece, and the structure of the front elastic control piece is the same as that of the rear elastic control piece.

The fifth concrete implementation mode: the present embodiment is further limited to the first, second, third or fourth embodiment, in the present embodiment, a first placing groove 34 and a second placing groove 35 are provided on an inner side wall of the sole frame 1, the first placing groove 34 and the second placing groove 35 are sequentially provided along a length direction of the sole frame 1, a shape of the first placing groove 34 is matched with a shape of the front Contraband-shaped connecting block 4, a shape of the second placing groove 35 is matched with a shape of the rear Contraband-shaped connecting block 5, the front Contraband-shaped connecting block 4 is provided in the first placing groove 34, a notch end of the front Contraband-shaped connecting block 4 is provided toward a front end of the sole frame 1, and the front Contraband-shaped connecting block 4 slides back and forth along the length direction of the first placing groove 34; the rear Contraband-shaped connecting block 5 is arranged in the second placing groove 35, the opening end of the rear Contraband-shaped connecting block 5 faces the rear end of the sole frame 1, the rear Contraband-shaped connecting block 5 slides back and forth along the length direction of the second placing groove 35, a first arc-shaped hole 36 and a second arc-shaped hole 37 are processed on the side wall of the sole frame 1, the first arc-shaped hole 36 and the second arc-shaped hole 37 are respectively communicated with the second placing groove 35, the first arc-shaped hole 36 is separated by a rear upper cross rod 5-1 to form a first hole position 6 and a second hole position 7, the first hole position 6 and the second hole position 7 are respectively matched with the second rotating shaft 26, the second arc-shaped hole 37 is separated by a rear extension rod 5-4 to form a third hole position 8 and a fourth hole position 9, and the third hole position 8 and the fourth hole position 9 are respectively matched with the fifth rotating shaft 29.

In the present embodiment, the first arc-shaped hole 36 and the second arc-shaped hole 37 are arc-shaped long holes.

In the embodiment, the rear Contraband-shaped connecting block 5 is driven by the connecting rod assembly to reciprocate along the length direction of the sole frame 1, when the rear Contraband-shaped connecting block 5 is driven by the connecting rod assembly to be at the first limit position, the rear extension rod 5-4 of the rear Contraband-shaped connecting block 5 is intersected with the second arc-shaped hole 37, the rear upper cross rod 5-1 is intersected with the first arc-shaped hole 36, the rear Contraband-shaped connecting block 5 moves in the corresponding second placing groove 35, the moving limit position is one end of the second placing groove 35 close to the rear end of the sole frame 1, and at the moment, the return spring 42 is stretched to the stretching limit state by the rear Contraband-shaped connecting block 5;

the rear upper cross bar 5-1 of the rear Contraband-shaped connecting block 5 separates the first arc-shaped hole 36 into a first hole position 6 and a second hole position 7, when the two rear long bars 12 drive the long bar wheel body 13 to be in the folding limit state, the second rotating shaft 26 is blocked in the first hole position 6 under the action of the rear upper cross bar 5-1 of the rear Contraband-shaped connecting block 5, so that the positioning effect of each rear long bar 12 through the second rotating shaft 26 is ensured to be in the folding limit state, and at the moment, the rear Contraband-shaped connecting block 5 enables the rear long bars 12 to be in the locking state, so that the long bar wheel body 13 is in the locking state of the folding limit; when two back poles 12 drive wheel body 13 for the stock and be in the expansion limit state, make second pivot 26 blockked in second hole site 7 under the effect of the last back horizontal beam 5-1 of back Contraband font connecting block 5, thereby ensure that every back pole 12 is in the expansion limit state through the location effect of second pivot 26, and back Contraband font connecting block 5 makes back pole 12 be in locking state this moment, thereby make wheel body 13 for the stock be in the locking state who expands the limit, locking state is lasting, avoid the influence of other external collisions that trigger occasionally to locking state.

When the rear upper cross bar 5-1 separates the first arc-shaped hole 36 into the first hole site 6 and the second hole site 7, the rear extension bar 5-4 of the rear Contraband-shaped connecting block 5 separates the second arc-shaped hole 37 into the third hole site 8 and the fourth hole site 9, when the two rear short bars 15 drive the short bar body 16 to be in the closed limit state, the fifth rotating shaft 29 is blocked in the third hole site 8 under the action of the rear extension bar 5-4 of the rear Contraband-shaped connecting block 5, so that the positioning effect of each rear short bar 15 through the fifth rotating shaft 29 is ensured to be in the closed limit state, and at the same time, the rear Contraband-shaped connecting block 5 enables the rear short bar 15 to be in the locked state, so that the short bar wheel body 16 is in the closed limit locked state; when the two rear short rods 15 drive the short rod wheel body 16 to be in the expansion limit state, the fifth rotating shaft 29 is blocked in the fourth hole position 9 under the action of the rear extension rod 5-4 of the rear Contraband-shaped connecting block 5, so that the positioning effect of each rear short rod 15 through the fifth rotating shaft 29 is ensured to be in the expansion limit state, and the rear Contraband-shaped connecting block 5 enables the rear short rod 15 to be in the locking state at the expansion limit, so that the short rod wheel body 16 is in the locking state at the expansion limit, the locking state is durable, and the influence of other accidental triggering external collision on the locking state is avoided.

Further, the two rear Contraband-shaped connecting blocks 5 at both sides of the inside of the sole frame 1 have the same movement posture and trend, thereby ensuring the same unfolding or folding action of the two rear long rods 12 and the two rear short rods 15. The movement postures and trends of the two front Contraband-shaped connecting blocks 4 at the two inner sides of the sole frame 1 are consistent, thereby ensuring the consistent unfolding or folding actions of the two front long rods 11 and the two front short rods 14.

Further, the front Contraband-shaped connecting block 4 and the rear Contraband-shaped connecting block 5 in each built-in control assembly are respectively provided with a return spring 42. The rear Contraband-shaped connecting block 5 comprises a rear upper cross bar 5-1, a rear middle vertical bar 5-2, a rear lower cross bar 5-3 and a rear extension bar 5-4, the front Contraband-shaped connecting block 4 and the rear Contraband-shaped connecting block 5 are identical in structure, namely, the front Contraband-shaped connecting block 4 comprises a front upper cross bar, a front middle vertical bar, a front lower cross bar and a front extension bar, the rear middle vertical bar 5-2 faces to one side of the front middle vertical bar of the front Contraband-shaped connecting block 4, a first hanging protrusion is processed and used for providing a connecting position for one end of the return spring 42, and a second hanging protrusion is processed and used for providing a connecting position for the other end of the return spring 42 on the inner wall of the first placing groove 34.

Furthermore, a return spring 42 corresponding to the rear Contraband-shaped connecting block 5 is arranged opposite to a return spring 42 corresponding to the front Contraband-shaped connecting block 4, the two opposite return springs 42 are respectively used for returning the front Contraband-shaped connecting block 4 and the rear Contraband-shaped connecting block 5, the front Contraband-shaped connecting block 4 and the rear Contraband-shaped connecting block 5 are in the same movement state, and the movement directions are opposite.

Further, when the rear Contraband-shaped connecting block 5 is driven by the connecting rod assembly to be in the second limit position, the rear extension rod 5-4 of the rear Contraband-shaped connecting block 5 and the second arc-shaped hole 37 are in a non-intersecting state, the rear upper cross rod 5-1 and the first arc-shaped hole 36 are in a non-intersecting state, the rear Contraband-shaped connecting block 5 moves in the corresponding second placing groove 35, the moving limit position is one end of the second placing groove 35 close to the front end of the sole frame 1, and at this time, the return spring 42 is squeezed by the rear Contraband-shaped connecting block 5 to be in a limit compression state.

The sixth specific implementation mode: the present embodiment is further limited to the first, second, third, fourth or fifth embodiment, as shown in fig. 10, the connecting rod assembly includes a main connecting rod 10-1, two connectors 10-2 and four auxiliary rods 10-3, the main connecting rod 10-1 is disposed in the sole frame 1, the length direction of the main connecting rod 10-1 is the same as the width direction of the sole frame 1, the two connectors 10-2 are respectively sleeved on the main connecting rod 10-1, each connector 10-2 is correspondingly provided with two auxiliary rods 10-3, each connector 10-2 is respectively hinged with the two corresponding auxiliary rods 10-3, one auxiliary rod 10-3 of the two auxiliary rods 10-3 is hinged with the first hinge raised head 23 of the front Contraband-shaped connecting block 4, the other auxiliary rod 10-3 of the two auxiliary rods 10-3 is hinged with the second hinge raised head 24 of the rear Contraband-shaped connecting block 5, the square rod 3 is hinged with one end of the connecting main rod 10-1.

In this embodiment, the first hinge projection 23 is located above the second hinge projection 24, and when the sub-rod 10-3 coupled to the front Contraband-shaped joint block 4 is coupled to the first hinge projection 23 of the front Contraband-shaped joint block 4, the other sub-rod 10-3 coupled to the same sub-rod 10-3 on the same connector 10-2 is hinged to the second hinge projection 24 of the rear Contraband-shaped joint block 5.

Further, the connector 10-2 comprises a main sleeve and two sub sleeves, the main sleeve is fixedly sleeved on the main connecting rod 10-1, the two sub sleeves are arranged on the outer wall of the main sleeve in parallel and located on the same radial straight line of the main sleeve, and the two sub sleeves are respectively hinged with the two auxiliary rods 10-3 corresponding to the connector 10-2.

The seventh embodiment: the embodiment is further limited by the first, second, third, fourth, fifth or sixth embodiment, wherein two front long rods 11 are arranged in the sole frame 1 in parallel, the distance between the two front long rods 11 is smaller than the width of the sole frame 1, two front short rods 14 are arranged in the sole frame 1 in parallel, the two front short rods 14 are arranged between the two front long rods 11, and the distance between the two front short rods 14 is smaller than the distance between the two front long rods 11; the two rear long rods 12 are arranged in the sole frame 1 in parallel, the distance between the two rear long rods 12 is smaller than the width of the sole frame 1, the two rear short rods 15 are arranged in the sole frame 1 in parallel, the two rear short rods 15 are arranged between the two rear long rods 12, and the distance between the two rear short rods 15 is smaller than the distance between the two rear long rods 12.

The specific implementation mode is eight: the present embodiment is further limited to the first, second, third, fourth, fifth, sixth or seventh embodiments, wherein each front long rod 11 is formed with a first protruding portion 18, each rear long rod 12 is formed with a second protruding portion 19, each front long rod 11, each rear long rod 12, each front short rod 14 and each rear short rod 15 are flat rod bodies, each front long rod 11 is formed with a plurality of first lightening holes 38 along the thickness direction thereof, each rear long rod 12 is formed with a plurality of second lightening holes 39 along the thickness direction thereof, each front short rod 14 is formed with a third lightening hole 40 along the thickness direction thereof, and each rear short rod 15 is formed with a fourth lightening hole 41 along the thickness direction thereof.

Further, the first protruding portion 18 is a protruding tip portion, which is disposed near the wheel body 13 for the long rod of the front long rod 11, and is used for increasing the contact position of the front long rod 11 and the bottom surface when the front long rod 11 is in the folded limit state, so as to increase the force application point, and ensure the stability of the whole structure of the present invention in the folded limit state.

Similarly, the second protrusion 19 is a protruding tip portion, which is disposed near the wheel body 13 for long rod on the rear long rod 12, and is used to increase the contact position between the rear long rod 12 and the bottom surface when the rear long rod 12 is in the folded limit state, so as to increase the force application point, thereby ensuring the stability of the whole structure of the present invention in the folded limit state.

The specific implementation method nine: the sole frame 1 comprises a first composition side cover 1-1, a second composition side cover 1-2 and a top cover 1-3, the first composition side cover 1-1 and the second composition side cover 1-2 are vertically arranged in parallel, a first groove is machined on one side of the first composition side cover 1-1, which faces the second composition side cover 1-2, a second groove is machined on one side of the second composition side cover 1-2, which faces the first composition side cover 1-1, the top cover 1-3 is horizontally arranged between the first composition side cover 1-1 and the second composition side cover 1-2, and two sides of the top cover 1-3 are respectively detachably connected with the first composition side cover 1-1 and the second composition side cover 1-2.

The detailed implementation mode is ten: the embodiment is further limited to the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth embodiment, the outer side wall of the sole frame 1 is provided with a strip-shaped convex rib 17, and the strip-shaped convex rib 17 is arranged near the front end of the sole frame 1.

The both sides wall of this embodiment's sole frame 1 wears to be equipped with bar bead 17 respectively, bar bead 17 is close to the front end of sole frame 1, bar bead 17 can restrict the translation degree of freedom of the x axle of preceding stock 11, guaranteed that preceding stock 11 makes the horizontal steady when expanding or drawing in the action in, bar bead 17 plays the stability of two preceding stocks 11 along 1 width direction of sole frame of injecing promptly, ensure that the horizontal range of rocking is in stability, avoid horizontal range of rocking too big, play the effect of supporting and restriction the ascending degree of freedom of x side to preceding stock 11, thereby standardize preceding stock 11 whereabouts or ascending movement track.

The invention can ensure that one wheel body 13 for the long rod and one wheel body 16 for the short rod which are close to the front end of the sole frame 1 can synchronously unfold or fold under the driving of the front Contraband-shaped connecting block 4, and can ensure that the other wheel body 13 for the long rod and the other wheel body 16 for the short rod which are close to the rear end of the sole frame 1 can synchronously unfold or fold under the driving of the rear Contraband-shaped connecting block 5.

The displacement amounts in the z-axis direction, i.e., the width direction of the sole frame 1, are equal, so that the height consistency of the two wheel bodies 13 for long rods and the two wheel bodies 16 for short rods is ensured, and the folding or unfolding action is smoother.

As shown in fig. 1, 2, 3, 4, 5, 6, 7 and 8, when the present invention is in the extended limit position, it shows that the two wheel bodies for long poles 13 and the two wheel bodies for short poles 16 are in the extended limit position, and the two long front poles 11, the two long rear poles 12, the two short front poles 14 and the two short rear poles 15 are in the extended limit position, and the second rotating shaft 26 is in the second hole position 7 of the first arc hole 36, and the fifth rotating shaft 29 is in the fourth hole position 9 of the second arc hole 37.

When the present invention is at the folding limit position, it indicates that the two wheel bodies for long rods 13 and the two wheel bodies for short rods 16 are at the folding limit position, and the two long front rods 11, the two long rear rods 12, the two short front rods 14 and the two short rear rods 15 are at the folding limit position, at this time, the second rotating shaft 26 is in the first hole position 6 of the first arc-shaped hole 36, and the fifth rotating shaft 29 is in the third hole position 8 of the second arc-shaped hole 37.

The working process is as follows:

the changing process of the invention from the unfolding limit position to the folding limit position is the process of the invention for changing the roller skates into the common shoes:

when the invention is in the unfolding limit position, the two wheel bodies for long rods 13 and the two wheel bodies for short rods 16 are in the unfolding limit position, the two long front rods 11, the two long rear rods 12, the two short front rods 14 and the two short rear rods 15 are in the unfolding limit position, at this time, the second rotating shaft 26 is in the second hole position 7 of the first arc-shaped hole 36, and the fifth rotating shaft 29 is in the fourth hole position 9 of the second arc-shaped hole 37;

the knob 2 is rotated anticlockwise and the twisted knob 2 is kept unchanged, the knob 2 rotates to drive the square rod 3 to rotate synchronously, the square rod 3 rotates to drive the connecting rod assembly to drive the two front Contraband-shaped connecting blocks 4 to move towards the rear end of the sole frame 1 in the first placing groove 34, the two rear Contraband-shaped connecting blocks 5 move towards the front end of the sole frame 1 in the second placing groove 35, when the rear Contraband-shaped connecting blocks 5 simultaneously leave the first arc-shaped hole 36 and the second arc-shaped hole 37, the rear Contraband-shaped connecting blocks 5, the first arc-shaped hole 36 and the second arc-shaped hole 37 are in a non-intersecting state, the second rotating shaft 26 and the fifth rotating shaft 29 move upwards under the reaction force generated by extruding the ground by the wheel bodies 13 for the long rods and the wheel bodies 16 for the short rods until the second rotating shaft 26 moves to the first hole position 6, and the fifth rotating shaft 29 moves to the third hole position 8, namely, the wheel bodies 13 for the long rods and the wheel bodies 13 and the short rods at the rear end of the sole frame 1 are determined to be folded from the unfolding limit position to the folding pole extremely The control process of the limit position is similar to the control process of the front Contraband-shaped connecting block 4, the front long rod 11 and the front short rod 14 which are matched with each other, so that the control process of the wheel body 13 for the long rod and the wheel body 16 for the short rod at the front end of the sole frame 1 from the expansion limit position to the folding limit position is completed. At this time, the knob 2 is loosened, the rear Contraband-shaped connecting blocks 5 respectively limit the positions of the second rotating shaft 26 and the fifth rotating shaft 29 under the rebounding action of the return spring 42, the effect of locking the furled state is achieved, and the motion states of the two rear Contraband-shaped connecting blocks 5 are synchronous. Similarly, the two front Contraband-shaped connecting blocks 4 and the rear Contraband-shaped connecting block 5 synchronously carry out the locking and positioning process of the folding limit state on the front long rod 11 and the two front short rods 14.

The change process from the folding limit position to the unfolding limit position is the process of the invention for changing the common shoes into the roller skates:

when the invention is at the folding limit position, the two wheel bodies for long rods 13 and the two wheel bodies for short rods 16 are all at the folding limit position, the two front long rods 11, the two rear long rods 12, the two front short rods 14 and the two rear short rods 15 are all at the folding limit position, at this time, the second rotating shaft 26 is in the first hole position 6 of the first arc-shaped hole 36, and the fifth rotating shaft 29 is in the third hole position 8 of the second arc-shaped hole 37;

the knob 2 is rotated clockwise and the twisted knob 2 is kept unchanged in position after twisting, the knob 2 rotates to drive the square rod 3 to rotate synchronously, the square rod 3 rotates to drive the connecting rod assembly to simultaneously drive the two front Contraband-shaped connecting blocks 4 to move towards the front end of the sole frame 1 in the first placing groove 34, the two rear Contraband-shaped connecting blocks 5 move towards the rear end of the sole frame 1 in the second placing groove 35, when the rear Contraband-shaped connecting blocks 5 simultaneously leave the first arc-shaped hole 36 and the second arc-shaped hole 37, the rear Contraband-shaped connecting blocks 5, the first arc-shaped hole 36 and the second arc-shaped hole 37 are in a non-intersecting state, the second rotating shaft 26 and the fifth rotating shaft 29 perform falling actions under the self-weight action of the wheel bodies 13 for the long rods and the wheel bodies 16 for the short rods on the wheel bodies 13 for the long rods and the wheel bodies 16 for the short rods, until the second rotating shaft 26 moves to the second hole position 7 and the fifth rotating shaft wheel bodies 29 move to the fourth hole position 9, namely, the wheel bodies 13 for the long rods and the wheel bodies 16 for the short rods at the rear end of the sole frame 1 are determined to be folded from the limit position to the expansion limit position The control process of (2) is similar to the control process of the front Contraband-shaped connecting block 4, the front long rod 11 and the front short rod 14 which are matched with each other, thereby completing the control process of the wheel body 13 for the long rod and the wheel body 16 for the short rod at the front end of the sole frame 1 from the folding limit position to the unfolding limit position. At this time, the knob 2 is loosened, the rear Contraband-shaped connecting blocks 5 respectively limit the positions of the second rotating shaft 26 and the fifth rotating shaft 29 under the rebounding action of the return spring 42, the effect of locking the furled state is achieved, and the motion states of the two rear Contraband-shaped connecting blocks 5 are synchronous. Similarly, the two front Contraband-shaped connecting blocks 4 and the rear Contraband-shaped connecting block 5 synchronously carry out the locking and positioning process of the unfolding limit state on the front long rod 11 and the two front short rods 14.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.