阅读说明：本技术 一种变距式开口装置 (Variable-pitch opening device ) 是由 杨晓萍 王增献 胡明华 金玲芝 周映 沈敏 于 2019-10-15 设计创作，主要内容包括：本发明提供了一种变距式开口装置,属于医疗器械技术领域。它解决了现有的开口装置手术空间和视野有限的问题。本变距式开口装置,包括把手支架、支撑体一和支撑体二,所述支撑体一和支撑体二均呈长条状且相对设置,所述支撑体一和支撑体二均设置在把手支架上且能够相对平移,所述支撑体一和/或支撑体二还能够在两者的平移面内相对把手支架摆动,所述把手支架上还设有能够使所述支撑体一和/或支撑体二摆动后定位的定位件一。本开口装置集成了两侧同步张开和单侧张开的功能于一体,能够实现对患者嘴巴两侧同步张开、单侧张开以及两侧同步张开与单侧张开配合等多种应用方式,适用性更广。(The invention provides a variable-pitch opening device, and belongs to the technical field of medical instruments. It has solved the limited problem of current opening device operation space and field of vision. This displacement formula opening device, including handle support, supporter one and supporter two all are rectangular form and relative setting, supporter one and supporter two all set up on handle support and can the translation relatively, supporter one and/or supporter two can also be in the relative handle support swing of translation face between them, still be equipped with on the handle support and make the setting element one of location after the swing of supporter one and/or supporter two. This opening device has integrateed both sides and has opened in an organic whole with the open function of unilateral, can realize opening in step, the unilateral is opened and both sides are opened and unilateral multiple application such as open the cooperation in step to patient's mouth both sides, and the suitability is wider.)

1. The utility model provides a displacement formula opening device, includes handle support (1), supporter one (2) and supporter two (3) all are rectangular form and relative setting, supporter one (2) and supporter two (3) all set up on handle support (1) and can the translation relatively, its characterized in that, supporter one (2) and/or supporter two (3) can also be in the relative handle support (1) swing of translation face between them, still be equipped with on handle support (1) and make locating piece one (4) of location after supporter one (2) and/or supporter two (3) swing.

2. The variable pitch opening device according to claim 1, wherein the first supporting body (2) is rotatably connected to the handle bracket (1) through a rotating shaft (5), and the handle bracket (1) is further provided with a driving assembly capable of driving the rotating shaft (5) to rotate.

3. The pitch-variable opening device according to claim 2, wherein the driving assembly comprises a rack (6) and a gear (7), the rack (6) is slidably inserted into the handle bracket (1), one end of the rotating shaft (5) is fixed to the first supporting body (2), the other end of the rotating shaft is rotatably connected to the handle bracket (1) and the gear (7) is fixed to the end of the rotating shaft, and the rack (6) is engaged with the gear (7).

4. The variable-pitch opening device according to claim 3, wherein the positioning piece I (4) is a positioning clamping plate (4a), the middle part of the positioning clamping plate (4a) is hinged to the handle bracket (1), a locking clamping tooth I (4a1) is arranged at one end of the positioning clamping plate (4a), a plurality of locking clamping teeth II (6a) are arranged on the rack (6), an elastic member (8) is further arranged between the other end of the positioning clamping plate (4a) and the handle bracket (1), and the locking clamping tooth I (4a1) on the positioning clamping plate (4a) is meshed with one locking clamping tooth II (6a) on the rack (6) under the action of the elastic member (8).

5. The variable pitch opening device according to claim 3 or 4, wherein the handle holder (1) comprises a body holder (1a) in an elongated shape and a side holder (1b) connected to one side of the body holder (1a), the side holder (1b) has a mounting cavity (1b1) therein, the gear (7) is disposed in the mounting cavity (1b1) and engaged with the rack (6), and both ends of the rack (6) slide out of the mounting cavity (1b 1).

6. The pitch-variable opening device as claimed in claim 2, wherein the driving assembly comprises a worm wheel and a worm, the worm is rotatably connected to the handle bracket (1), one end of the rotating shaft (5) is fixed with the first supporting body (2), the other end of the rotating shaft is rotatably connected to the handle bracket (1), the worm wheel is fixed at the end of the rotating shaft, and the worm is in transmission fit with the worm wheel.

7. The variable-pitch opening device according to claim 5, wherein the second supporting body (3) is slidably connected to the body support (1a), and the body support (1a) is further provided with a control assembly capable of driving the second supporting body (3) to translate along the body support (1a) and positioning after translation.

8. Pitch-change opening device according to claim 7, characterized in that the handling assembly comprises an operating handle (9) and a sliding bar (10), the sliding strip (10) is connected to the body bracket (1a) in a sliding manner along the length direction of the body bracket (1a), the middle part of the operating handle (9) is hinged on the handle bracket (1), and the middle part of the operating handle (9) is provided with a convex swinging part (9a), the swinging part (9a) is provided with an arc-shaped surface, and the arc-shaped surface is provided with a first transmission gear (9a1), a second transmission gear (10a) is distributed on the sliding bar (10) along the length direction, the first transmission gear (9a1) is meshed with the second transmission gear (10a), the second supporting body (3) is fixed on the sliding bar (10), the control assembly further comprises a second positioning piece capable of positioning the sliding strip (10).

9. The variable-pitch opening device according to claim 8, wherein the second positioning element is a positioning block (11), the positioning block (11) has two positioning blocks (11) respectively located at two sides of the swinging portion (9a), the positioning block (11) is long-shaped, the middle portion of the positioning block (11) is hinged to the body bracket (1a), one end of the positioning block (11) is provided with a positioning portion (11a) protruding towards the direction of the sliding strip (10), the positioning portion (11a) is provided with a limiting tooth (11a1) and a limiting tooth (11a1) is clamped into the second transmission tooth (10a), one end of the positioning block (11) provided with the limiting tooth (11a1) is further provided with an open slot (11b), the swinging portion (9a) is further provided with a linkage strip (9a2) protruding towards two sides, and the linkage strip (9a2) extends into the corresponding open slot (11b), linkage strip (9a2) with one side lateral wall that slide bar (10) was kept away from in open slot (11b) pastes and leans on, linkage strip (9a2) with the clearance has between the opposite side lateral wall of open slot (11b), the other end of locating piece (11) is fixed on body support (1a), driving tooth (9a1), driving tooth two (10a) and spacing tooth (11a1) are the skewed tooth, locating piece (11) adopt elastic plastic to make.

10. The variable-pitch opening device according to claim 9, wherein the handle bracket (1) further comprises an operating plate (1c), the body bracket (1a) further comprises a limiting column (12), one end of the operating plate (1c) is fixed on the limiting column (12), a strip-shaped abdicating hole (1c1) is formed in the operating plate (1c), the operating handle (9) is partially embedded into the abdicating hole (1c1) and the middle part of the operating handle (9) is hinged on the inner wall of the abdicating hole (1c1), the other end of the operating plate (1c) is a free end and a gap is formed between the free end and the body bracket (1a), the middle part of the operating plate (1c) is provided with a convex arc leaning part, the arc leaning part is arranged on one side of the hinged position of the operating handle (9) and the operating plate (1c) close to the free end of the operating plate (1c), the arc top of the arc abutting part abuts against the body support (1a), and the operating plate (1c) is made of elastic plastic materials.

Technical Field

The invention belongs to the technical field of medical instruments, and relates to a variable-pitch opening device.

Background

The mouth gag is an instrument for opening mouth in medical procedures such as dyspnea or unconsciousness requiring gastric lavage, or dental care operations in stomatology, other oral operations and the like. The existing traditional mouth gag is generally in a U shape, and two end parts of the mouth gag are respectively and fixedly connected with a handle. The mouth gag body has elasticity, the two side arms of the mouth gag body can bend towards the inside or the outside of the mouth gag body when being pressed by external pressure, and when the external pressure disappears, the two side arms of the mouth gag body restore to the original positions again. The mouth gag has the advantages of simple structure, simple and convenient operation and low cost, is suitable for various oral medical institutions, and is particularly suitable for oral medical operations. However, the mouth gag simply supports and fixes the oral cavity, the degree of opening of the mouth gag cannot be adjusted according to different medical requirements and patient conditions, and the mouth gag is poor in applicability and comfort.

In view of the above problems, the chinese patent application (application No. 201820850321.4) discloses an adjustable orthodontic mouth gag for department of stomatology, comprising: the two supporting plates are of arc structures; the utility model discloses an adjusting structure, adjusting structure is fixed in the layer board, adjusting structure includes actuating lever, first regulating plate, sliding sleeve, slide bar, second regulating plate and bearing, first regulating plate with the second regulating plate is fixed in two that the symmetry set up respectively the layer board, the bearing embedding the inside of first regulating plate, the actuating lever with the bearing block, the actuating lever passes through the bearing with first regulating plate rotates to be connected, the sliding sleeve with the slide bar symmetry respectively is located first regulating plate with the looks remote site of second regulating plate, the slide bar with sliding sleeve sliding connection, the actuating lever run through in the sliding sleeve extends to the inside of slide bar, just the slide bar with threaded connection between the actuating lever. The distance between two supporting plates of the mouth gag can be adjusted, so that the mouth gag can be used by different people conveniently, the tension of the lip part of a patient can be adjusted, the operation flexibility is greatly improved, and the use comfort level is improved.

However, the above mouth gag still has the following defects: the mouth gag can realize the size adjustment of the opening, but the tension limit of the mouth of patients in different ages and patients in the same age are different, and some operations require the mouth of the patient to be expanded to be larger, but the operation often exceeds the tension limit of the mouth of the patient, so that the space and the visual field of the operation are limited, the operation is difficult, the operation is influenced, the operation efficiency is influenced, and even the operation effect is influenced.

In order to have enough operation space and visual field, the mouth gag is used to forcibly open the mouth of the patient to meet the requirement, and the mouth gag causes damage to the tissues of the mouth of the human body, such as muscle strain, tearing or dislocation.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a variable-pitch opening device, which aims to solve the technical problems that: how to solve the problem that the operation space and the visual field are limited due to the tension limit of the mouth of the patient.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a displacement formula opening device, includes handle support, supporter one and supporter two all are rectangular form and relative setting, supporter one and supporter two all set up on handle support and can the translation relatively, its characterized in that, supporter one and/or supporter two can also be in the relative handle support swing of translation face between them, still be equipped with on the handle support and make the setting element one of location after supporter one and/or supporter two swings.

When the opening device is used, the first supporting body and the second supporting body are used for extending into a mouth of a patient, upper jaw teeth of the patient are abutted against the first supporting body, lower jaw teeth are abutted against the second supporting body, two ends of the first supporting body and the second supporting body are equally divided into two sides of the mouth respectively, and the opening amplitude of the mouth can be achieved by adjusting the relative translation of the first supporting body and the second supporting body. Simultaneously this opening device's supporter one and/or supporter two can also be in the relative handle support swing of translation face between them to can realize the interval adjustment of unilateral through rotating, make the range of opening of patient's mouth one side great, the range of opening of opposite side is less, and to same one person, the range limit that the mouth unilateral can open will be far more than the range limit that the mouth both sides opened in step, open to suitable range after rethread setting element one location. This opening device has integrateed both sides and opened in step and unilateral open function in an organic whole promptly, has overcome the technical prejudice, through the human organizational structure's of make full use of characteristic, compares current mouth gag and has promoted the extreme value of the range that human mouth can open to there is sufficient space to carry out the operation to this side, has accomplished the back and has adjusted the opposite side again and carry out the operation, has guaranteed the smooth and easy nature of operation, has improved efficiency, also the at utmost has guaranteed the effect of operation. Meanwhile, the special structural design of the opening device also makes the adjustment mode more abundant, and the applicable medical occasions are wider.

In the above variable-pitch shedding device, the first support body is rotatably connected to the handle bracket through a rotating shaft, and the handle bracket is further provided with a driving assembly capable of driving the rotating shaft to rotate. Can control and drive the pivot through drive assembly and rotate, the pivot drives the swing of supporter one to can control patient's mouth unilateral according to the demand and open, compare and open in step and can open the range bigger with both sides, thereby can provide sufficient operation space, guarantee the smooth and easy nature of operation, improve efficiency, also furthest's assurance the effect of operation.

In the above pitch-variable opening device, the driving assembly includes a rack and a gear, the rack is slidably disposed on the handle bracket, one end of the rotating shaft is fixed to the first supporting body, the other end of the rotating shaft is rotatably connected to the handle bracket, the gear is fixed to the other end of the rotating shaft, and the rack is engaged with the gear. During the use, the pulling rack can drive the pivot through the mating reaction of gear and rotate, and the pivot drives the relative handle support swing of supporter to can control patient's mouth unilateral according to the demand and open, easy and simple to handle, it is bigger to compare the range that opens and can open in step with both sides, thereby can provide sufficient operation space, has guaranteed the smooth and easy nature of operation, has improved efficiency, also the at utmost has guaranteed the effect of operation.

In the above variable-pitch shedding device, the first positioning piece is a first positioning clamp plate, the middle part of the first positioning clamp plate is hinged to the handle support, one end of the first positioning clamp plate is provided with a first locking clamp tooth, the rack is provided with a plurality of second locking clamp teeth, an elastic part is further arranged between the other end of the first positioning clamp plate and the handle support, and the first locking clamp tooth on the first positioning clamp plate and one of the second locking clamp teeth on the rack are meshed with each other under the action of the elastic part. Under the action of elastic force of the elastic piece, the first locking clamping teeth on the positioning clamping plate are meshed with the second locking clamping teeth on the rack, so that the rack and the gear are in a clamping state, and the first support body and the second support body are kept in a fixed opening range. During the adjustment, only need press the location cardboard, the location cardboard is overcome the elastic force and is acted on around the pin joint and upwards swung, locking latch one breaks away from locking latch two and is removed the locking, then pull the rack again, just can drive the supporter through the mating reaction of gear and swing the regulation that realizes the single side of patient's mouth and open the range, and is easy and simple to handle, it is bigger to compare with both sides synchronous opening and the range that can open, thereby can provide sufficient operation space, the smoothness nature of operation has been guaranteed, the efficiency is improved, also the effect of operation has been guaranteed to the at utmost.

In the above variable-pitch opening device, the handle bracket comprises a long-strip-shaped body bracket and a side bracket connected to one side of the body bracket, an installation cavity is arranged in the side bracket, the gear is arranged in the installation cavity and meshed with the rack, and two ends of the rack are both slid out of the installation cavity. The arrangement of the side support is convenient for the installation of the gear and the rack, and the interference caused by the use of the first support body and the second support body is avoided.

Alternatively, in the above variable pitch shedding device, the driving assembly includes a worm wheel and a worm, the worm is rotatably connected to the handle bracket, one end of the rotating shaft is fixed to the first supporting body, the other end of the rotating shaft is rotatably connected to the handle bracket, the worm wheel is fixed to the other end of the rotating shaft, and the worm is in transmission fit with the worm wheel. During the use, rotate the worm, can drive the pivot through the mating reaction of worm and worm wheel and rotate, the pivot drives the relative handle support swing of supporter to can control patient's mouth unilateral and open according to the demand, easy and simple to handle, it is bigger to compare the range that opens and can open in step with both sides, thereby can provide sufficient operation space, has guaranteed the smooth and easy nature of operation, has improved efficiency, also the at utmost has guaranteed the effect of operation.

In the variable-pitch opening device, the second support body is slidably connected to the body support, and the body support is further provided with a control assembly capable of driving the second support body to translate along the body support and then to realize positioning. Can control a supporter two relative supporter translation and location through controlling the subassembly to can realize the synchronous adjustment of both sides interval of supporter one and supporter two, thereby make this mouth gag can realize opening in step, the unilateral is opened and both sides are opened and are opened with the unilateral in step and multiple application modes such as cooperation, the suitability is wider.

In foretell displacement formula opening device, control the subassembly and include operating handle and slide bar, the slide bar is along body support length direction sliding connection on body support, operating handle's middle part articulates on handle support, just operating handle's middle part has convex swing portion, it has driving tooth one to have on arcwall face and this arcwall face on the swing portion, it has driving tooth two to distribute along its length direction on the slide bar, driving tooth one and driving tooth intermeshing, supporter two is fixed on the slide bar, control the subassembly and still include the setting element two that can advance line location to the slide bar. During the use, remove the location to the sliding strip earlier with setting element two, then press operating handle and can make the swing portion swing around the pin joint, the cooperation that transmission tooth one on the arc face of swing portion and transmission tooth two on the sliding strip promotes the sliding strip and slides along body support length direction, thereby drive supporter two and a relative supporter translation on body support, thereby realize opening patient's mouth both sides in step, when adjusting to required opening range, again with the setting element two pairs of sliding strips reposition of redundant personnel connect can, easy and simple to handle.

In the above variable-pitch shedding device, the second positioning element is a positioning block, the positioning block has two positioning blocks and two positioning blocks are respectively positioned at two sides of the swinging part, the positioning block is in a long strip shape, the middle part of the positioning block is hinged on the body bracket, one end of the positioning block is provided with a positioning part protruding towards the direction of the sliding strip, the positioning part is provided with a limiting tooth and the limiting tooth is clamped into the second transmission tooth, one end of the positioning block provided with the limiting tooth is also provided with an open slot, the swinging part is also provided with a linkage strip protruding towards two sides, the linkage strip extends into the corresponding open slot, the linkage strip is attached to one side wall of the open slot far away from the sliding strip, a gap is formed between the linkage strip and the other side wall of the open slot, the other end of the positioning block is fixed on the body bracket, and the first transmission tooth, the second transmission tooth, the positioning block is made of elastic plastics.

Under normal conditions, spacing tooth card on the locating piece of both sides is gone into in the driving tooth two to deadlocking driving tooth one and driving tooth two makes both sides can not realize the transmission, when needs are adjusted, only need press operating handle once, the swing portion on the operating handle can swing around articulated department, thereby the linkage strip of swing portion one side upwards swings and promotes the tip with the locating piece that corresponds upwards swing around articulated department, spacing tooth on this locating piece breaks away from driving tooth two, the other end deformation of this locating piece produces the elastic force. The linkage strip of swing portion opposite side swings downwards, because the clearance has between this linkage strip and the lower lateral wall that corresponds the open slot on the locating piece, there is not transmission relation between this linkage strip and the locating piece, the swing portion is when the swing simultaneously, there is a thrust to the sliding strip with the cooperation of driving tooth two on the swing portion arcwall face, because spacing tooth and driving tooth two are the skewed tooth, cooperation through the skewed tooth inclined plane, can promote the one end that this locating piece has spacing tooth around articulated department upwards swing and remove the injecture under the effect of this thrust, the other end deformation of this locating piece produces the elastic force, the position of a driving tooth of sliding strip slip, then the effect of the deformation elastic force through the locating piece, two locating pieces reset, two spacing teeth are gone into again and are realized the location jointly in the driving tooth two. Analogize according to above operation to can realize controlling two relative supporter translations of supporter, convenient operation, press operating handle moreover once, the distance that two translations of supporter had a driving gear two in other words, the distance of adjustment can accurate perception.

In foretell displacement formula split device, the sliding tray has been seted up along its length direction on the body support, the slider sliding connection be in the sliding tray, be fixed with the connecting rod on the slider, the notch that the connecting rod stretches out the sliding tray with the supporter links firmly two mutually, set up the mouth of stepping down that runs through between the body on the diapire of sliding tray, the swing portion passes and lets the mouth stretch into in the sliding tray, the locating piece inlays to be established in the mouth of stepping down. Through the arrangement, the control assembly, the first support body and the second support body are respectively positioned on two sides of the body support, interference cannot occur, and meanwhile, enough operation space is provided.

In foretell displacement formula opening device, the handle support still includes the operation panel, spacing post still has on the body support, the one end of operation panel is fixed on spacing post, set up the hole of stepping down that is the bar on the operation panel, operation handle portion embedding step down downthehole and operating handle's middle part articulate on the inner wall in the hole of stepping down, the other end of operation panel has the clearance for between free end and this end and the body support, the middle part of operation panel has convex arc to support and leans on the portion, the arc supports and leans on the position in one side that the articulated department of operating handle and operation panel is close to the operation panel free end, the arc top that the arc supported the portion supports and leans on the body support, the operation panel adopts the elastic plastic material to make. Operating handle articulates on the operating panel, has used up the back, presses the free end of operating panel downwards, through lever principle, and the other end of operating panel can the upswing to drive the whole rebound of operating handle, the spacing tooth of two locating pieces and the last driving tooth of operating handle are first all breaks away from with the second driving tooth on the sliding strip, thereby can directly promote the sliding strip and slide, make supporter two can the translation reset. And because the other end of the operating panel relative to the free end is fixed on the limiting column, the operating panel generates elastic deformation when swinging upwards under the action of the lever principle, and the operating panel can automatically reset after the pressing force of the free end disappears, thereby driving the whole operating handle to reset. Through the setting of operation panel for the operation is more simple and convenient.

In foretell displacement formula opening device, the notch both sides of sliding tray still have the location turn-ups of turning over the book inwards, sliding bar sliding connection in the sliding tray and with the location turn-ups pastes mutually and lean on, the mounting groove has been seted up on the sliding bar, connecting rod one end is fixed with the supporter two phase, and the other end has the installation piece, the installation piece is type of calligraphy, the installation piece inlays to be established in the mounting groove and two step faces on the installation piece paste respectively and lean on two location turn-ups, sliding tray one end is run through the body support. The installation piece inlays the dress and fixes a position in the mounting groove of slide bar and through location turn-ups joint, and simultaneously, the one end of slide bar is run through the body support again to make and realized releasable connection, be convenient for change between the second and slide bar of supporter.

In the variable-pitch opening device, the first support body and the second support body are both arc-shaped, the first limiting flanging formed by turning over towards the direction far away from the second support body is arranged on both sides of the first support body, and the second limiting flanging formed by turning over towards the direction far away from the first support body is arranged on both sides of the second support body. The curved design accords with human mouth contour design, and the design of spacing turn-ups one and spacing turn-ups two can support with the tooth and lean on, prevents that the patient from unconsciously spitting out whole mouth gag from the mouth and influencing the treatment.

In the above-mentioned variable pitch shedding device, the first support body and/or the second support body are/is further provided with a binding piece. The binding piece can be a bandage or a magic tape, so that the whole mouth gag can be conveniently fixed on the head of a patient.

In the above-mentioned variable-pitch shedding device, the operating handle is further provided with a plurality of force application grooves, the force application grooves are arc-shaped, and a continuous corrugated structure is formed among the force application grooves. Through the design, the operation is more comfortable, and the hand feeling is better.

Compared with the prior art, the pitch-variable opening device has the following advantages:

1. this opening device has integrateed both sides and has opened in an organic whole with the open function of unilateral, can realize opening in step, the unilateral is opened and both sides are opened and unilateral multiple application such as open the cooperation in step to patient's mouth both sides, and the suitability is wider.

2. Through the design that the rotation realized the unilateral and adjusted, make full use of the characteristics of human organizational structure, compare current mouth gag and promoted the extreme value of the range that human mouth can open to there is enough space to carry out the operation to this side, has adjusted the opposite side again after having accomplished and has carried out the operation, has guaranteed the smooth and easy nature of operation, has improved efficiency, also furthest's assurance the effect of operation.

3. The whole structure is simple, and the operation is convenient.

4. The first support body and the second support body are in arc structural design, accord with the contour design of the mouth of a human body, are comfortable, and the first limit flange and the second limit flange can abut against teeth to prevent a patient from unconsciously spitting out the whole mouth gag from the mouth to affect treatment.

Drawings

Fig. 1 is a structural view of a first support body and a second support body of the variable pitch opening apparatus in a closed state.

Fig. 2 is a structural view of the first support body and the second support body of the variable pitch opening device in a state of synchronously opening both sides.

Fig. 3 is a structural view of the first support body and the second support body of the variable pitch shedding apparatus in a left-side opened state.

Fig. 4 is a structural view of the first support body and the second support body of the variable pitch opening device in a right-side opened state.

Fig. 5 is a first cross-sectional view of the present variable pitch opening device.

Fig. 6 is a second sectional view of the variable pitch opening device.

Fig. 7 is a perspective view of the body bracket.

Fig. 8 is a perspective view of the second support body.

Fig. 9 is a perspective view of the slide bar.

In the drawings, 1, a handle bracket; 1a, a body bracket; 1a1, sliding groove; 1a2, abdication port; 1a3, positioning flanges; 1b, side brackets; 1b1, mounting cavity; 1c, an operation panel; 1c1, abdicating hole; 2. a first support body; 2a, limiting and flanging one; 3. a second support body; 3a, limiting flanging two; 4. a first positioning piece; 4a, a positioning clamping plate; 4a1, locking latch I; 5. a rotating shaft; 6. a rack; 6a, locking latch II; 7. a gear; 8. an elastic member; 9. an operating handle; 9a, a swing part; 9a1, a first transmission gear; 9a2, linkage bar; 10. a slide bar; 10a, a second transmission gear; 10b, mounting grooves; 11. positioning blocks; 11a, a positioning part; 11a1, limit teeth; 11b, an open slot; 12. a limiting column; 13. a connecting rod; 14. mounting blocks; 15. a binding member.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.