阅读说明：本技术 一种便于上下扶梯的高稳定性婴儿车 (High stability perambulator convenient to upper and lower staircase ) 是由 刘艳明 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种便于上下扶梯的高稳定性婴儿车,属于婴儿车领域,一种便于上下扶梯的高稳定性婴儿车,在需要上下扶梯时,使用者可用脚直接踩踏气转杆和借力横挡进行借力,气转杆内气体发生转移,带动下斥球进入支撑杆内,与圆头顶杆产生相互排斥力,此时向上提车体,可实现对直轮高度的改变,使直轮和斜轮高低错落,符合楼梯的特征,相较于现有技术,有效避免在上下扶梯时,车轮悬空或者婴儿篮倾斜的情况发生,大幅度提高上下扶梯时的稳定性以及安全性,另外,相较于现有技术中通过螺栓调整高度的方式,显著降低操作难度,提高独自带婴儿出行的家长操作的便利性。(The invention discloses a high-stability baby carriage convenient for getting on and off an escalator, belonging to the field of baby carriages, when the user needs to get on or off the escalator, the user can directly step on the air rotating rod and the force-assisting crosspiece by feet to assist the force, the air in the air rotating rod is transferred to drive the lower repelling balls to enter the supporting rod to generate mutual repulsion force with the round-head ejector rods, and then the cart body is lifted upwards, can change the height of the straight wheel, make the straight wheel and the oblique wheel staggered and fall, meet the characteristics of stairs, effectively avoid the problems of climbing stairs, the suspension of the wheels or the inclination of the baby basket can greatly improve the stability and the safety when the baby basket goes up and down the escalator, in addition, compare in prior art through the mode of bolt height-adjusting, show and reduce the operation degree of difficulty, improve the convenience of taking the head of a family's operation of baby's trip alone.)

1. The utility model provides a high stability perambulator convenient to escalator, is including having the rotatable automobile body that pushes away the handle, the automobile body lower extreme is connected with a pair of oblique wheel and a pair of straight wheel, its characterized in that: a gas rotating rod (2) and a force-borrowing transverse baffle (3) are fixedly connected between the straight wheels, the force-borrowing transverse baffle (3) is positioned below the gas rotating rod (2), the upper ends of the straight wheels are fixedly connected with a round-head ejector rod (10), the lower end of the trolley body is fixedly connected with a supporting rod (1), the round-head ejector rod (10) is connected with the supporting rod (1) in a clamping manner, the round-head ejector rod (10) is positioned in the supporting rod (1), two middle-shrinkage snap rings (5) are fixedly connected with the inner wall of the vertical section of the supporting rod (1), an upper baffle (6) is arranged above the middle-shrinkage snap ring (5) above the supporting rod, a lower baffle ring (11) is arranged below the middle-shrinkage snap ring (5) below the supporting rod (1), the lower baffle ring (11) and the upper baffle (6) are both fixedly connected with the inner wall of the supporting rod (1), and a gas sealing sheet (7) is fixedly connected with the end part of the gas rotating rod (2) close to the supporting rod (1), one end of the air sealing sheet (7) close to the support rod (1) is fixedly connected with a lower repelling ball (8), and the ends of the lower repelling ball (8) and the round-head ejector rod (10) are matched with each other.

2. The high stability baby carriage convenient for getting on and off the stairs of claim 1, wherein: the magnetic blocks are embedded in the end part of the round-head ejector rod (10) and the lower repelling ball (8), and the two magnetic blocks repel each other.

3. The high stability baby carriage convenient for getting on and off the stairs of claim 2, wherein: the utility model discloses a support bar, including bracing piece (1), draw-in groove (9) are dug to bracing piece (1) upper end, draw-in groove (9) with repel ball (8) phase-match down, repel ball (8) tip down and extend to bracing piece (1) in, just repel ball (8) down and be located the part of bracing piece (1) and be no more than half.

4. The high stability baby carriage convenient for getting on and off the stairs of claim 1, wherein: the air sealing piece (7) is an elastic sealing structure, and the supporting rod (1) is communicated with the air rotating rod (2).

5. The high stability baby carriage convenient for getting on and off the stairs of claim 1, wherein: the pneumatic rotating rod (2) comprises a hollow tube (21) connected between the two support rods (1) and a pre-flat bag (22) connected to the middle of the hollow tube (21), the hollow tube (21) is communicated with the pre-flat bag (22), and air with the compression multiple of 1-1.5 is filled in a space surrounded by the hollow tube (21), the pre-flat bag (22) and the air sealing sheet (7).

6. The high stability baby carriage convenient for getting on and off the stairs of claim 5, wherein: the hollow tube (21) is of a hard structure, the pre-flat bag (22) is of an elastic sealing structure, and the diameter of the pre-flat bag (22) is 5-10 times that of the hollow tube (21).

7. The high stability baby carriage convenient for getting on and off the stairs of claim 6, wherein: the middle part of the force-borrowing transverse baffle (3) is of a flat structure, and the middle part of the force-borrowing transverse baffle (3) is in contact with the top point of the lower end part of the pneumatic rotating rod (2).

8. The high stability baby carriage convenient for getting on and off the stairs of claim 1, wherein: the outer surface of the pre-flat bag (22) is fixedly connected with a rubber strip (4), and the rubber strip (4) is of an arc-shaped protruding structure.

9. The high stability baby carriage convenient for getting on and off the stairs of claim 1, wherein: the utility model discloses a powder production device, including well shrinkage snap ring (5), powder discharge ring hole has been dug to well shrinkage snap ring (5) inside packing has graphite alkene powder, it moves seal ring (52) to go out to cut at the middle part turn department of shrinkage snap ring (5), it seals ring (52) to move to be equipped with between (52) and bracing piece (1) inner wall a plurality of vaulting poles (51) that become to move.

10. The high stability baby carriage convenient for getting on and off the stairs of claim 9, wherein: the variable stay bar (51) is made of silicon rubber materials, and the diameter of the dynamic seal ring (52) is larger than the radial span of the powder outlet ring hole.

Technical Field

The invention relates to the field of strollers, in particular to a high-stability stroller convenient for getting on and off an escalator.

Background

The baby carriage is a tool carriage designed for providing convenience for outdoor activities of babies, and has various vehicle types, the baby carriage is generally played by children aged 1 to 2 years, the toy carriage with wheels is played by children aged over 2 years, the baby carriage can bring certain benefits to the intelligence development of the children, and the brain development of the children is increased.

In actual life, although a user is not recommended to push the baby carriage to take the escalator, in a large public environment, such as a shopping mall, the phenomenon that the baby carriage goes up the escalator often exists, in the prior art, the using environment is rarely considered when the baby carriage is manufactured, so that the problem that the baby carriage generally has the following problem of being rarely solved because the escalator is in an inclined stair shape is solved.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a high-stability baby carriage convenient for getting on and off an escalator, when the baby carriage needs to get on and off the escalator, a user can directly step on an air rotating rod and an assisting transverse baffle by feet to assist the force, the air in the air rotating rod is transferred to drive a repellent ball to enter a supporting rod and generate mutual repulsion force with a round-head ejector rod, and then the air rotating rod lifts a carriage body upwards to change the height of a straight wheel, so that the straight wheel and an inclined wheel are staggered in height, the characteristics of a stair are met.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A high-stability baby carriage convenient for getting on and off an escalator comprises a carriage body with a rotatable push handle, wherein the lower end of the carriage body is connected with a pair of oblique wheels and a pair of straight wheels, an air rotating rod and a force-assisting crosspiece are fixedly connected between the pair of straight wheels, the force-assisting crosspiece is positioned below the air rotating rod, the upper end of each straight wheel is fixedly connected with a round-head ejector rod, the lower end of the carriage body is fixedly connected with a supporting rod, the round-head ejector rod is clamped with the supporting rod, the round-head ejector rod is positioned in the supporting rod, the inner wall of the vertical section of the supporting rod is fixedly connected with two middle-shrinkage snap rings, an upper baffle is arranged above the middle-shrinkage snap rings, a lower baffle is arranged below the middle-shrinkage snap rings below the lower baffle, the lower baffle and the upper baffle are both fixedly connected with the inner wall of the supporting rod, the end part of the air rotating rod, which is close to the supporting rod, is fixedly connected with an air sealing sheet, one end of the air sealing sheet, which is close to the supporting rod, is fixedly connected with a lower repelling ball, and the ends of the lower repelling ball and the round head ejector rod are matched with each other.

Furthermore, the magnetic blocks are embedded in the end part of the round-head ejector rod and the lower repelling ball, and the two magnetic blocks are mutually exclusive, when the user needs to go up and down stairs and adjust the height of the straight wheel, the user can directly step on the air rotating rod by feet to enable the air in the air rotating rod to be concentrated towards the end part of the air rotating rod and generate thrust on the air sealing sheet, so that the lower repelling ball is driven to completely enter the supporting rod, the lower repelling ball and the round-head ejector rod generate mutual repulsion force under the action of the magnetic blocks, the vehicle body is lifted upwards at the moment, the round-head ejector rod leaves the middle-contraction-shaped clamping ring and is clamped in the middle-contraction-shaped clamping ring below the middle-contraction-shaped clamping ring, the height change of the round-head ejector rod and the inclined wheel is realized, the straight wheel and the inclined wheel are staggered in height and accord with the characteristics of the stairs, so that the stability and the safety when the user goes up and down the stairs are obviously improved, compared with the mode of adjusting the height through bolts in the prior art, the operation difficulty is obviously reduced, and the convenience of the independent operation of parents with the baby on the travel, in addition, when the baby carriage descends to the escalator, the direction of the push handle can be changed in a rotating mode, and a user can conveniently hold and position the baby carriage.

Further, the upper end of the support rod is provided with a clamping groove, after mutual repulsion force is generated, the lower repellent ball is moved upwards to be clamped into the clamping groove, so that the lower repellent ball is difficult to extrude back into the air rotating rod, and then the repulsion force generated by the lower repellent ball on the round-head ejector rod after treading is effectively guaranteed, the operation difficulty of a user is reduced, the clamping groove is matched with the lower repellent ball, the end of the lower repellent ball extends into the support rod, and the lower repellent ball is located in the support rod and is not more than half of the part, so that the lower repellent ball and the round-head ejector rod are difficult to generate mutual repulsion force when a baby carriage is normally pushed.

Furthermore, the air sealing piece is an elastic sealing structure, and the supporting rod is communicated with the air rotating rod, so that the air in the air rotating rod is effectively prevented from overflowing.

Further, the air bull stick is including connecting the hollow tube between two bracing pieces and connecting the flat bag in advance at the hollow tube middle part, the hollow tube communicates with each other with flat bag in advance, the hollow tube, fill in the space that flat bag and air-tight piece enclose in advance has the compression multiple at 1-1.5's air, when trampling air bull stick borrow power tensile bracing piece and button head ejector pin, the impact to air-tight piece can be improved to the compressed air, in the ball that repels under being convenient for entered into the bracing piece, the tensile of the effective auxiliary stay pole of repulsion force and button head ejector pin of production reduces user's self required application of force, improves the operation convenience.

Furthermore, the hollow tube is of a hard structure, the pre-flat bag is of an elastic sealing structure, the diameter of the pre-flat bag is 5-10 times of that of the hollow tube, so that relatively more air is stored in the pre-flat bag, and after the pre-flat bag is trampled and transferred into the hollow tube, the thrust generated by the air sealing sheet is larger, and the situation that the lower repellent ball enters the upper part of the round head ejector rod is effectively guaranteed.

Further, borrow power crosspiece middle part and be the platykurtic structure, and borrow power crosspiece middle part and the contact of tip summit department under the gas bull stick, on the one hand, borrow the flat structure of power crosspiece, be convenient for step on and make the vertical quick deformation of gas bull stick when stepping on the gas bull stick, on the other hand is convenient for borrow power, reduces the degree of difficulty that the user changed position between button head ejector pin and the well contraction shape snap ring.

Further, the outer fixed surface of the pre-flat bag is connected with a rubber strip, the rubber strip is of an arc-shaped protruding structure, the rubber strip is used for skid prevention, the phenomenon that when the rubber strip is trampled, a pneumatic rotating rod and a force-assisted cross bar generate large position deviation is effectively avoided, and the smooth transfer of air in the pre-flat bag is effectively guaranteed.

Furthermore, the inside packing of well shrinkage shape snap ring has graphite alkene powder, well shrinkage shape snap ring middle part turn department cuts out and has a powder ring hole, be equipped with on the powder ring hole and move the seal ring, it is connected with a plurality of vaulting poles to move between seal ring and the bracing piece inner wall.

Further, it makes for silicon rubber materials to become the vaulting pole, makes it have certain elasticity, and the button head ejector pin produces the extrusion force to moving the seal ring when taking place the position change, makes to move to produce certain space between seal ring and the play powder trepan boring, makes inside graphite alkene powder drop to effectively reduce the frictional force between button head ejector pin and the well contraction shape snap ring, reduce the degree of difficulty of extension bracing piece, move the seal ring diameter and be greater than the radial span of a powder trepan boring, make the seal ring be difficult for droing, effectively guarantee the shutoff to graphite alkene powder.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) this scheme is when the staircase about needs, the user can directly step on gas bull stick and borrow the power crosspiece with the foot and borrow the power, gaseous emergence shifts in the gas bull stick, drive down repel the ball and get into in the bracing piece, produce repulsion force each other with the button head ejector pin, to the automobile body of lifting this moment, can realize the change to the straight wheel height, make straight wheel and oblique wheel height fall by mistake, accord with the characteristic of stair, compare in prior art, effectively avoid when going up and down the staircase, the unsettled or baby basket slope's of wheel condition takes place, stability and security when going up and down the staircase are increased substantially, in addition, compare in prior art through the mode of bolt height-adjusting, show the reduction operation degree of difficulty, improve the convenience of the head of a family's operation of taking the baby to go on a journey alone.

(2) Round-head ejector pin tip all inlays in repelling the ball with down and has the magnetic path, and two magnetic paths repel each other, when the needs walk up and down stairs, when the height of adjustment straight wheel, can the foot directly step on the gas bull stick, make its inside gas concentrate towards the gas bull stick tip, produce thrust to sealing the gas piece, and then drive down repel the ball and enter into the bracing piece completely, under the magnetic path effect, make and repel ball and round-head ejector pin under and produce repulsion force each other, lift the automobile body to this moment, make round-head ejector pin leave in the shrink shape snap ring and block into in the shrink shape snap ring of below, show and reduce the operation degree of difficulty, the realization is to its change of height.

(3) The upper end of the supporting rod is provided with a clamping groove in a chiseling mode, after mutual repulsion force is generated, the lower repelling ball moves upwards and is clamped into the clamping groove, the lower repelling ball is made to be difficult to extrude back into the air rotating rod, the repulsion force generated by the lower repelling ball on the round-head ejector rod after treading is effectively guaranteed, the operation difficulty of a user is reduced, the clamping groove is matched with the lower repelling ball, the end of the lower repelling ball extends into the supporting rod, the part of the lower repelling ball located in the supporting rod is not more than half, and the lower repelling ball and the round-head ejector rod are made to be difficult to generate mutual repulsion force when a baby carriage is normally pushed.

(4) The air sealing piece is an elastic sealing structure, and the supporting rod is communicated with the air rotating rod, so that the air in the air rotating rod is effectively prevented from overflowing.

(5) The air rotating rod comprises a hollow tube connected between two supporting rods and a pre-flat bag connected to the middle of the hollow tube, the hollow tube is communicated with the pre-flat bag, the hollow tube is filled with air with a compression multiple of 1-1.5 in the space enclosed by the pre-flat bag and the air sealing piece, when the air rotating rod is trampled and the supporting rod and the round-head ejector rod are stretched by virtue of force, the compressed air can improve the impact on the air sealing piece, the repelling balls can enter the supporting rod conveniently, the generated repulsion force effectively assists in stretching the supporting rod and the round-head ejector rod, the required force applied by a user is reduced, and the operation convenience is improved.

(6) The hollow tube is the stereoplasm structure, and the flat bag is elastic seal structure in advance, and the flat bag diameter in advance is 5-10 times of hollow tube diameter, makes the air of storing in the flat bag in advance relatively more, shifts to the back in the hollow tube when trampling, makes the thrust that produces to sealing the gas piece bigger, effectively guarantees to repel the ball down and enters into button head ejector pin top.

(7) Borrow power crosspiece middle part and be the platykurtic structure, and borrow power crosspiece middle part and the contact of tip summit department under the gas bull stick, on the one hand, borrow the flat structure of power crosspiece, make the vertical quick deformation of gas bull stick when being convenient for step on the gas bull stick, on the other hand is convenient for borrow power, reduces the degree of difficulty that the user changed position between button head ejector pin and the well contraction shape snap ring.

(8) The outer fixed surface of the pre-flat bag is fixedly connected with a rubber strip which is of an arc-shaped protruding structure, the rubber strip is used for preventing skidding, the phenomenon that when the rubber strip is trampled, a large position deviation is generated between the pneumatic rotating rod and the force-assisted cross bar is effectively avoided, and the smooth transfer of air in the pre-flat bag is effectively guaranteed.

(9) The graphite powder is filled in the middle shrinkage snap ring, a powder outlet annular hole is formed in the middle turning position of the middle shrinkage snap ring, a movable sealing ring is arranged on the powder outlet annular hole, and a plurality of variable support rods are connected between the movable sealing ring and the inner wall of the support rod.

(10) Become the vaulting pole and make for silicon rubber material, make it have certain elasticity, the button head ejector pin when taking place the position change, produce the extrusion force to moving the seal ring, make to move to seal the ring and produce certain space between the powder annular ring, make inside graphite alkene powder drop, thereby effectively reduce the frictional force between button head ejector pin and the well contraction shape snap ring, reduce the degree of difficulty of extension bracing piece, move the diameter of the seal ring and be greater than the radial span who goes out the powder annular ring, make the seal ring be difficult for droing, effectively guarantee the shutoff to graphite alkene powder.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic diagram of a partial perspective structure of the straight wheel of the present invention;

FIG. 3 is a schematic structural view of the air rotating rod of the present invention;

FIG. 4 is a schematic structural view of a pre-flaccid capsule of the present invention;

FIG. 5 is a schematic view of the inner portion of the brace of the present invention;

FIG. 6 is a schematic view of the joint between the air roller and the support rod according to the present invention;

FIG. 7 is a schematic view of the structure of the joint between the air spindle and the support rod during the pedaling process of the present invention;

FIG. 8 is a schematic view of the connection between the pneumatic rotary bar and the support bar after pedaling;

FIG. 9 is a schematic perspective view of a snap ring of the present invention;

FIG. 10 is a schematic structural view of a cross section of a middle-shrinkage snap ring of the present invention;

fig. 11 is a schematic view of the structure of the present invention when descending an escalator;

fig. 12 is a schematic view showing a structure of a baby carriage on an escalator in the prior art.

The reference numbers in the figures illustrate:

the device comprises a support rod 1, a pneumatic rotating rod 2, a hollow tube 21, a pre-flat bag 22, a force-assisted cross bar 3, a rubber strip 4, a middle-shrinkage snap ring 5, a variable stay rod 51, a dynamic seal ring 52, an upper baffle 6, an air seal sheet 7, a lower 8-repelling ball, a clamping groove 9, a round-head ejector rod 10 and a lower 11-blocking ring.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-2, a high stability baby carriage convenient for getting on and off an escalator comprises a carriage body with a rotatable push handle, a pair of oblique wheels and a pair of straight wheels are connected to the lower end of the carriage body, an air rotating rod 2 and a force-borrowing cross bar 3 are fixedly connected between the pair of straight wheels, and the force-borrowing cross bar 3 is located below the air rotating rod 2.

Referring to fig. 5, a round-head ejector rod 10 is fixedly connected to the upper end of a straight wheel, a support rod 1 is fixedly connected to the lower end of a vehicle body, the round-head ejector rod 10 is connected with the support rod 1 in a clamped mode, the round-head ejector rod 10 is located in the support rod 1, two middle-shrinkage clamp rings 5 are fixedly connected to the inner wall of the vertical section of the support rod 1, an upper baffle plate 6 is arranged above the middle-shrinkage clamp ring 5 above the middle-shrinkage clamp ring 10, a lower baffle ring 11 is arranged below the middle-shrinkage clamp ring 5 below the middle-shrinkage clamp ring, and the lower baffle ring 11 and the upper baffle plate 6 are both fixedly connected to the inner wall of the support rod 1.

Referring to fig. 6, an end portion of the air rotating rod 2 close to the support rod 1 is fixedly connected with an air sealing sheet 7, the air sealing sheet 7 is an elastic sealing structure, the support rod 1 is communicated with the air rotating rod 2, so as to effectively prevent air in the air rotating rod 2 from overflowing, one end of the air sealing sheet 7 close to the support rod 1 is fixedly connected with a lower repelling ball 8, the lower repelling ball 8 is matched with an end portion of the round-head ejector rod 10, magnetic blocks are embedded in the end portion of the round-head ejector rod 10 and the lower repelling ball 8, and the two magnetic blocks repel each other, when the height of the straight wheel is adjusted to go up and down stairs, a foot can directly step on the air rotating rod 2, so that air in the air rotating rod 2 is concentrated towards the end portion of the air rotating rod 2, as shown in fig. 7-8, thrust is generated on the air sealing sheet 7, the lower repelling ball 8 is further driven to completely enter the support rod 1, the lower repelling ball 8 and the round-head ejector rod 10 generate mutual repulsion under the action of the magnetic blocks, and at the action of the magnetic blocks, at this time, a car body repulsion force is lifted upwards, the round-head ejector rod 10 is separated from the middle-shrinkage snap ring 5 and clamped into the middle-shrinkage snap ring 5 below, the operation difficulty is obviously reduced, and the height of the round-head ejector rod is changed.

In addition, as shown in fig. 11, when the baby carriage descends the staircase, the direction of the push handle can be changed in a rotating way, so that the baby carriage is convenient for a user to hold and position.

Referring to fig. 6, a clamping groove 9 is chiseled at the upper end of the supporting rod 1, as shown in fig. 8, after a mutual repulsion force is generated, the lower repulsion ball 8 moves upwards and is clamped into the clamping groove 9, so that the lower repulsion ball 8 is not easily squeezed back into the air rotating rod 2, the repulsion force generated by the trample to the round-head ejector rod 10 is effectively ensured, the operation difficulty of a user is reduced, the clamping groove 9 is matched with the lower repulsion ball 8, the end of the lower repulsion ball 8 extends into the supporting rod 1, and the part of the lower repulsion ball 8 located in the supporting rod 1 is not more than half, so that the mutual repulsion force is not easily generated between the lower repulsion ball 8 and the round-head ejector rod 10 when the baby carriage is normally pushed.

Referring to fig. 3-4, the air rotating rod 2 includes a hollow tube 21 connected between two support rods 1 and a pre-flatting bag 22 connected to the middle of the hollow tube 21, the hollow tube 21 is communicated with the pre-flatting bag 22, the space enclosed by the hollow tube 21, the pre-flatting bag 22 and the air sealing sheet 7 is filled with air with a compression multiple of 1-1.5, when the air rotating rod 2 is trampled to stretch the support rods 1 and the round head push rods 10 by virtue of force, the compressed air can improve the impact on the air sealing sheet 7, so that the lower repelling balls 8 can enter the support rods 1, the generated repelling force effectively assists in stretching the support rods 1 and the round head push rods 10, the force required by the user is reduced, and the operation convenience is improved.

The hollow tube 21 is a hard structure, the pre-flat bag 22 is an elastic sealing structure, the diameter of the pre-flat bag 22 is 5-10 times of that of the hollow tube 21, so that relatively more air is stored in the pre-flat bag 22, after the pre-flat bag is trampled and transferred into the hollow tube 21, the thrust generated on the air sealing sheet 7 is larger, the lower repellent ball 8 is effectively ensured to enter the upper part of the round-head ejector rod 10, the middle part of the borrowing cross bar 3 is of a flat structure, and the middle part of the borrowing cross bar 3 is contacted with the vertex of the lower end part of the air rotating rod 2, on one hand, the flat structure of the borrowing cross bar 3 is convenient to trample the air rotating rod 2 to longitudinally and rapidly deform the air rotating rod 2, on the other hand, the borrowing of the force is convenient, the difficulty of changing the position between the round-head ejector rod 10 and the middle shrinkage clamp ring 5 by a user is reduced, the rubber strip 4 is fixedly connected to the outer surface of the pre-flat bag 22, the rubber strip 4 is of an arc-shaped bulge structure, the rubber strip 4 is used as an antiskid function, and is effectively avoided when the trampling, the air rotating rod 2 and the force-assisted cross bar 3 generate larger position deviation, and the air in the pre-flat bag 22 can be effectively ensured to be smoothly transferred.

Referring to fig. 9-10, graphene powder is filled in the middle-shrinkage snap ring 5, a powder discharge ring hole is formed at a turning position in the middle of the middle-shrinkage snap ring 5, a movable seal ring 52 is arranged on the powder discharge ring hole, a plurality of variable stay bars 51 are connected between the movable seal ring 52 and the inner wall of the support rod 1, and the variable stay bars 51 are made of silicon rubber material and have certain elasticity, when the position of the round-head ejector rod 10 changes, extrusion force is generated on the movable seal ring 52, a certain gap is generated between the movable seal ring 52 and the powder discharge ring hole, so that the graphene powder in the inner part drops, friction between the round-head ejector rod 10 and the middle-shrinkage snap ring 5 is effectively reduced, difficulty in extending the support rod 1 is reduced, the diameter of the movable seal ring 52 is greater than the radial span of the powder discharge ring hole, the movable seal ring 52 is not easy to drop, and plugging of the graphene powder is effectively ensured.

When the staircase is gone up and down in needs, the user can directly step on gas bull stick 2 and borrow power crosspiece 3 with the foot and borrow the power, gas takes place to shift in the gas bull stick 2, drive in repelling ball 8 gets into bracing piece 1 down, produce repulsion force each other with button head ejector pin 10, upwards carry the automobile body this moment, can realize the change to the straight wheel height, make straight wheel and oblique wheel height fall by mistake, accord with the characteristic of stair, compare in the prior art in figure 12, effectively avoid when going up and down the staircase, the unsettled or baby basket slope's the condition of wheel takes place, stability and security when going up and down the staircase increase substantially, in addition, compare in prior art through the mode of bolt height adjustment, show the reduction operation degree of difficulty, improve alone the convenience of taking the head of a family's operation of baby's trip.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.