Suitcase hand brake device

Abstract

The utility model relates to a travel suitcase hand brake device which comprises a shell, a brake push button component, a brake cable and a traction sliding block unit, a sliding seat of the brake push button component is limited in the shell and slides in the transverse direction, and the brake push button component is provided with a locking mechanism for locking the brake push button component at a brake position. The elastic element provides spring force for driving the brake push button component to reset from the brake position to the release position, the traction sliding block unit is limited in the shell to slide in the longitudinal direction, the traction sliding block unit is provided with a linkage part and a wire connecting part, the linkage part comprises a connecting block, the connecting block is provided with a push-pull inclined rail extending in an inclined mode in the longitudinal direction, and the wire connecting part is connected with the push-pull inclined rail. The push-pull inclined rail obliquely extends from the upper end to the lower end in the direction corresponding to the moving direction of the brake push button component from the release position to the brake position, a push-pull arm is arranged on the sliding seat, a push-pull part is arranged on the push-pull arm, and the push-pull part is matched with the push-pull inclined rail in a pushing mode. The device has the advantages of simple structure and stable action.

Description

Technical Field

[0001] The utility model relates to luggage accessories, specifically a handbrake device for a suitcase. Background Art

[0002] The braking system with a handbrake operation form is a common braking structure on existing suitcases. It realizes the connection between the operation part arranged on the top of the luggage and the braking part of the casters through a steel wire. Among them, the operation part has a pressing operation using a longitudinal button or a pushing button form of horizontal sliding (such as the "A Pull - rope Brake Wheel and Travel Luggage" disclosed in the application number 202311736023.4). However, the existing push - button operating mechanism has the problems of complex structure and unstable action reliability. Summary of the Invention

[0003] The invention object of the utility model: To overcome the defects existing in the prior art, the utility model provides a handbrake device for a suitcase with a simple structure and stable action.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] A handbrake device for a suitcase, comprising a housing, a brake push - button member, a brake wire, and a traction slider unit. The brake push - button member includes a sliding seat and an operation button arranged on the sliding seat and exposed outside the housing. The brake push - button member is restricted to slide horizontally in the housing through the sliding seat. The brake push - button member has a braking position and a release position along the sliding direction. The brake push - button member is configured with a locking mechanism for locking the brake push - button member in the braking position and an elastic element for providing a spring force to drive the brake push - button member to reset from the braking position to the release position. The traction slider unit is restricted to slide longitudinally in the housing. The traction slider unit has a linkage part linked to the brake push - button member and a wire connection part for connecting the brake wire. It is characterized in that: The linkage part includes a connecting block. A push - pull inclined rail extending obliquely longitudinally is arranged on the connecting block. The push - pull inclined rail extends obliquely from the upper end to the lower end in a direction corresponding to the moving direction of the brake push - button member from the release position to the braking position. A push - pull arm is arranged on the sliding seat of the brake push - button member, and a push - pull part is arranged on the push - pull arm. The push - pull part is in top - push cooperation with the push - pull inclined rail.

[0006] Preferably, the push - pull part is a convex cylinder arranged on the push - pull arm, and the push - pull inclined rail is a groove arranged on the connecting block. The convex cylinder is inserted into the groove.

[0007] Preferably, the locking mechanism includes a button that is restricted to slide longitudinally on the housing and a button spring that drives the button to pop up. A locking post protrudes from the bottom of the button. A swollen locking head end is provided at the free end of the columnar body of the locking post. A locking plate is provided on the sliding seat. The locking plate has a forked head. The fork groove of the forked head is adapted to the columnar body of the locking post. A locking groove corresponding to the end of the fork groove and larger than the width of the fork groove is provided at the bottom of the forked head. The locking groove forms a constriction connecting to the fork groove. The bottom end opening of the locking groove is connected to a ramp driving wall provided at the bottom of the fork arm of the forked head. The ramp driving wall extends obliquely from the end close to the root of the fork arm towards the free end of the fork arm to form a gradually thinning fork arm. When the columnar body of the locking post is inserted into the fork groove of the forked head, the ramp driving wall pushes against the locking head end to drive the button to press and slide. When the locking head end corresponds to the position of the locking groove, the locking head end falls into the locking groove. The locking head end is restricted by the constriction to form the locking of the button to the brake push button member.

[0008] Preferably, the traction slider unit includes an active slider having the linkage portion and a driven slider having the wire connection portion. Both the active slider and the driven slider are configured to be restricted to slide in the housing. An accommodation space is provided on the active slider. The driven slider is placed in the accommodation space and associated with the active slider. The active slider and the driven slider can slide relative to each other. A pushing portion is provided on the active slider. A spiral pushing spring for realizing the linkage of the active slider and the driven slider is provided between the pushing portion and the driven slider.

[0009] Preferably, the driven slider includes two wire connection portions and an intermediate connection portion located between the two wire connection portions. The intermediate connection portion connects two hanging portions. A sliding positioning structure is provided on the intermediate connection portion. A guiding slide rail for guiding and cooperating with the sliding positioning structure is provided on the active slider.

[0010] Preferably, the guiding slide rail includes a sliding guide groove. Wall plates are provided on both lateral sides of the sliding guide groove. The sliding positioning structure includes a positioning block on the intermediate connection portion. The positioning block extends into the sliding guide groove and is in sliding positioning cooperation with the sliding guide groove. Spacing grooves are formed at intervals between the positioning block and the two hanging portions. The wall plates are inserted into the spacing grooves.

[0011] Preferably, a clamping rib is provided at the bottom of the sliding guide groove. Clearance grooves are provided on both sides of the clamping rib at the bottom of the sliding guide groove. Two oppositely arranged elastic claws are provided on the positioning block. The claw heads of the two elastic claws are arranged facing each other. A clamping opening is formed between the two elastic claws. The elastic claws pass through the clearance grooves, and the clamping opening is buckled on the clamping rib and the elastic claws can slide relative to the clamping rib in a cooperating manner.

[0012] Preferably, the lateral side of the accommodation space further has side plates opposite to the two wall plates respectively. A spring accommodation groove is formed between the side plate and the adjacent wall plate. The hanging part and the spiral push spring are both placed in the spring accommodation groove, and the hanging part is in guiding cooperation with the spring accommodation groove.

[0013] Preferably, the housing includes a bottom case having an assembly cavity and a cover case covering the opening of the assembly cavity. After the brake push button member and the traction slider unit are assembled in the assembly cavity, they are covered by the cover case. The accommodation space of the active slider has a bottom plate. The traction slider unit is assembled into the bottom case in the direction of the bottom plate facing the opening of the assembly cavity. The connecting block is arranged on one side of the active slider close to the bottom plate. Thus, a space is formed between the lower part of the connecting block and the bottom wall of the assembly cavity of the bottom case, and the pushing and pulling part is correspondingly located in the space. When the traction slider unit is inserted into and taken out of the assembly cavity, the pushing and pulling part is engaged with and disengaged from the pushing and pulling inclined rail.

[0014] By adopting the above technical solutions, a single relatively movable matching point between the brake push button member and the traction slider unit realizes linkage, with a simple structure and stable and reliable driving. Moreover, mutual acting forces can be provided between the push button member and the traction slider unit to ensure that both the brake push button member and the traction slider unit achieve relatively reliable reset actions. In addition, the traction slider unit adopts the cooperation of an active slider, a driven slider and a spiral push spring to form an elastic space between the operation part and the transmission path of the brake wire. This elastic space can well adapt to the error of the brake wire length, thereby eliminating the problems of braking misoperation or non-operation caused by the deviation of the brake wire length.

[0015] The present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the travel case handbrake device of the present invention;

[0017] Figure 2 is a view showing the open state of the cover case of the travel case handbrake device of the present invention;

[0018] Figure 3 is a view showing the state where the traction slider unit is removed of the present invention;

[0019] Figure 4 is a schematic internal structural view of the travel case handbrake device of the present invention;

[0020] Figure 5 is a schematic structural view of the traction slider unit of the present invention;

[0021] Figure 6 is an exploded view of the traction slider unit of the present invention;

[0022] Figure 7This is a schematic structural view of another embodiment of the present utility model. Specific Embodiment

[0023] Refer to the appendix Figures 1 - 6 , a suitcase handbrake device disclosed by the present utility model includes a housing 1, a brake push button member 2, a brake cable 3, and a traction slider unit 4. The housing 1 generally includes a bottom shell 11 having an assembly cavity and a cover shell 12 covering the opening of the assembly cavity. After the brake push button member 2 and the traction slider unit 4 are assembled in the assembly cavity, they are covered by the cover shell 12. The brake push button member 2 includes a sliding seat 21 and an operation button 22 provided on the sliding seat 21 and exposed from the housing. The brake push button member 2 is restricted to slide transversely (in the direction of the X axis) within the housing 1 through the sliding seat 21. The brake push button member 2 has a braking position and a release position along the sliding direction (refer to Figure 2 shown), the brake push button member 2 is configured with a locking mechanism 5 for locking the brake push button member 2 in the braking position, and an elastic element 6 for providing a spring force to drive the brake push button member 2 to reset from the braking position to the release position. The traction slider unit 4 is restricted to slide longitudinally (in the direction of the Y axis) within the housing 1. The traction slider unit 4 has a linkage portion 411 linked to the brake push button member 2 and a wire connection portion 421 for connecting the brake cable 3. The linkage portion 411 includes a connection block 4110, and a push-pull inclined rail 4111 extending obliquely longitudinally is provided on the connection block 4110. The push-pull inclined rail 4111 extends obliquely from the upper end a to the lower end b in a direction corresponding to the moving direction of the brake push button member 2 from the release position to the braking position (such as Figure 1 the direction of the indication arrow x1 on the panel of the housing in the figure). A push-pull arm 23 is provided on the sliding seat 21 of the brake push button member 2, and a push-pull portion 231 is provided on the push-pull arm 23. The push-pull portion 231 is in top-push cooperation with the push-pull inclined rail 4111. There is a single relatively movable mating point between the brake push button member and the traction slider unit to achieve linkage, with a simple structure and stable and reliable driving; and mutual acting forces can be provided between the push button member and the traction slider unit to ensure relatively reliable reset actions of both the brake push button member and the traction slider unit.

[0024] Furthermore, the push-pull portion 231 is a convex cylinder provided on the push-pull arm 23, and the push-pull inclined rail 4111 is a groove provided on the connection block. The convex cylinder is inserted into the groove. It has a simple structure, is convenient for processing, and is convenient for connection and disconnection. Of course, the push-pull portion can also be designed with a mating groove, and the push-pull inclined rail is designed as a protruding track bar, and the mating groove is buckled on the protrusion to achieve top-push cooperation; however, this design has the defects of inconvenient assembly and inconvenient processing.

[0025] As an implementation manner of the present utility model, the locking mechanism includes a button 51 restricted to slide longitudinally on the housing 1 and a button spring 52 for driving the button 51 to bounce. A locking column 511 protrudes from the bottom of the button 51. A swollen locking head end 5111 is provided at the free end of the columnar body of the locking column 511. A locking plate 24 is provided on the sliding seat 21. The locking plate 24 has a fork-shaped head. The fork groove 241 of the fork-shaped head is adapted to the columnar body of the locking column 511. A locking groove 242 corresponding to the end of the fork groove 241 and larger than the width of the fork groove 241 is provided at the bottom of the fork-shaped head. The locking groove 242 forms a constriction connecting to the fork groove 241. The bottom opening of the locking groove 242 is connected to a ramp driving wall 2431 provided at the bottom of the fork arm 243 of the fork-shaped head. The ramp driving wall 2431 shows an inclined extension gradually thinning the fork arm 243 from the end close to the root of the fork arm 243 to the free end of the fork arm. When the columnar body of the locking column 511 is inserted into the fork groove of the fork-shaped head, the ramp driving wall 2431 pushes the locking head end 5111 to drive the button 51 to press and slide down. When the locking head end 5111 corresponds to the position of the locking groove 242, the locking head end 5111 falls into the locking groove 242. The locking head end 5111 is locked by the button to the brake push button member 2 under the restriction of the constriction. Push the operation button, and the brake push button member slides to the braking position. While driving the traction slider unit, the fork opening of the fork-shaped head on the locking plate enters the locking column. The fork-shaped head presses the locking head end through the ramp driving wall to drive the button to press down. When the locking head end corresponds to the position of the locking groove, driven by the button spring, the button bounces up, and the locking head end falls into the locking groove. Under the restriction of the constriction of the locking groove, the locking column cannot withdraw along the fork groove, and the button locks the brake push button member in the braking position; when unlocking, press the button to push the locking head end out of the locking groove. Driven by the elastic element, the fork-shaped head withdraws from the locking column, and the brake push button member resets to the release position. More simply, the button 51 is installed and positioned by the card feet.

[0026] In this specific embodiment, the traction slider unit 4 includes a driving slider 41 having the linkage portion 411 and a driven slider 42 having the wire connection portion 421. The driving slider 41 and the driven slider 42 are both configured to be restricted to slide in the housing 1. A receiving space is provided on the driving slider 41. The driven slider 42 is placed in the receiving space and associated with the driving slider 41. The driving slider 41 and the driven slider 42 can slide relative to each other. A pushing portion 412 is provided on the driving slider 41. A spiral pushing spring 43 for realizing the linkage of the driving slider 41 and the driven slider 42 is arranged between the pushing portion 412 and the driven slider 42. Compared with the traditional design of a single slider and a slider return spring, the brake push button member pushes the driving slider. The driving slider drives the driven slider to pull the brake wire through the spiral pushing spring. An elastic space is formed between the brake push button member (operating part) and the transmission path of the brake wire. This elastic space can well adapt to the error of the brake wire length, thereby eliminating the problem of braking malfunction or non-action caused by the length deviation of the brake wire.

[0027] To achieve a more compact design, the pushing portion 412 and the wire connection portion 421 on the driven slider 42 are arranged oppositely. A wire avoidance channel 4121 for the brake wire 3 to pass through is provided on the pushing portion 412. The wire avoidance channel 4121 is in the shape of an open slot to facilitate the disassembly and assembly between the brake wire and the driven slider. One end of the spiral pushing spring 43 abuts against the wire connection portion 421, and the other end of the spiral pushing spring 43 abuts against the pushing portion 412. The brake wire 3 passes through the spiral pushing spring 43 through the wire avoidance channel 4121 and is connected to the wire connection portion 421. A more compact design of the driven slider along the sliding direction is realized, making the structures of the driven slider and the driving slider compact. Therefore, as a feasible way of the present invention, the driven slider can adopt a pushing structure design independent of the wire connection portion. A space for avoidance needs to be provided between the pushing structure and the wire connection portion to enable the pushing portion to be arranged between the pushing structure and the wire connection portion and provide an installation space for the spiral pushing spring; this design makes the longitudinal dimension of the driven slider larger and the required assembly space increases.

[0028] Generally, the brake cable is designed with two cables. To achieve a matching drive and considering the possible sliding stability problem due to the relatively compact longitudinal dimension design of the driven slider, the following further optimized design is adopted. The driven slider 42 is provided with two cable connection parts 421 and an intermediate connection part 422 located between the two cable connection parts 421. The intermediate connection part 422 connects the two hanging parts 421. A sliding positioning structure is provided on the intermediate connection part 422, and a guiding slide rail that is guidingly matched with the sliding positioning structure is provided on the active slider 41. In this way, two hanging parts are directly formed on a single driven slider to provide connections for the brake cables, realizing an expansion of the transverse dimension of the driven slider, and this expansion does not increase the overall transverse dimension because the traction slider unit usually needs to be configured with a structure for connecting two brake cables. Compared with a single driven slider configured with one cable connection part, the design of using two driven sliders, without an obvious increase in volume, realizes more positionable settings on the driven slider, that is, a sliding positioning structure is provided on the intermediate connection part, and a guiding slide rail that is guidingly matched with the sliding positioning structure is provided on the active slider.

[0029] Among them, the design of the sliding positioning structure and the guiding slide rail can adopt the simple design as Figure 6 shown, which uses the guiding rib on the active slider 41 to cooperate with the groove on the intermediate connection part 422 to achieve positioning and guiding, but the positioning and guiding reliability of the driven slider is insufficient; therefore, the following more reliable design is adopted, as Figures 1 - 5 shown, specifically:

[0030] The guiding slide rail includes a sliding guide groove 413, and wall plates 414 are provided on both lateral sides of the sliding guide groove 413. The sliding positioning structure includes a positioning block 4221 on the intermediate connection part 422. The positioning block 4221 extends into the sliding guide groove 413 and is slidably and positioningly matched with the sliding guide groove 413. Spacing grooves 4222 are formed at intervals between the positioning block 4221 and the two hanging parts 421, and the wall plates 414 are inserted into the spacing grooves 4222.

[0031] In the specific application process, usually the brake cable and the traction slider unit need to be separately packaged and transported. When they are to be assembled onto the luggage, the brake cable and the traction slider unit are then connected. Therefore, the traction slider unit usually needs to be removed from the housing, the brake cable is installed, and then it is installed back into the housing. Therefore, as a detachable module, the connection of the traction slider unit is reliable and not easily scattered to avoid unnecessary trouble during use. Although the driven slider can be associated with the driving slider to form a whole under the limitation of positioning and the helical pushing spring 43, there is still a risk. Therefore, the following optimized design is adopted: a clamping rib 415 is provided at the bottom of the sliding guide groove 413, and clearance grooves 416 are provided on both sides of the clamping rib 415 at the bottom of the sliding guide groove 413. Two oppositely arranged elastic claws 4223 are provided on the positioning block 4221, the claw heads of the two elastic claws 4223 are arranged towards each other, and a clamping opening is formed between the two elastic claws 4223. The elastic claws 4223 pass through the clearance grooves 416, the clamping opening is buckled on the clamping rib 415, and the elastic claws 4223 and the clamping rib 415 can be slidably matched with each other.

[0032] On the lateral side of the accommodation space, there are also side plates 417 opposite to the two wall plates 414 respectively. A spring accommodation groove 418 is formed between the side plate 417 and the adjacent wall plate 414. The hanging part 421 and the helical pushing spring are both placed in the spring accommodation groove 418 to realize the limitation and protection of the helical pushing spring and the hanging part, and the spring accommodation groove can also realize the design of positioning and guiding cooperation for the hanging part.

[0033] In view of the actual disassembly and assembly requirements of the traction slider unit from the housing, the accommodation space of the driving slider 41 has a bottom plate 419. The traction slider unit 4 is assembled into the bottom shell 11 with the bottom plate 419 facing the opening of the assembly cavity. The connecting block 4110 is arranged on the side of the driving slider 41 close to the bottom plate 419. Therefore, an empty space I is formed between the lower part of the connecting block 4110 and the bottom wall of the assembly cavity of the bottom shell 11, and the pushing and pulling part 231 is correspondingly located in the empty space I. When the traction slider unit 4 is placed into the assembly cavity, the pushing and pulling part 231 and the pushing and pulling inclined rail 4111 are mutually engaged, and when the traction slider unit 4 exits the assembly cavity, the pushing and pulling part 231 and the pushing and pulling inclined rail 4111 are mutually disengaged. Figure 6 Compared with the design of the scheme shown, the disassembly and assembly of the traction slider unit will not be affected by the pushing and pulling part and the pushing and pulling inclined rail.

Claims

1. A suitcase handbrake device, comprising a housing, a brake push button component, a brake line and a traction slider unit, wherein the brake push button component comprises a sliding seat and an operating button disposed on the sliding seat and exposed from the housing, the brake push button component is restricted to slide laterally in the housing via the sliding seat, the brake push button component has a braking position and a release position along the sliding direction, the brake push button component is provided with a locking mechanism for locking the brake push button component in the braking position, and an elastic element for providing a spring force for driving the brake push button component to return from the braking position to the release position, the traction slider unit is restricted to slide longitudinally in the housing, the traction slider unit has a linkage portion linked to the brake push button component and a wire connection portion for connecting the brake line, characterized in that: The linkage part includes a connecting block, on which is provided a push-pull inclined rail extending obliquely along the longitudinal direction. The push-pull inclined rail extends obliquely from the upper end to the lower end in a direction corresponding to the direction of movement of the brake push button component from the release position to the braking position. A push-pull arm is provided on the sliding seat of the brake push button component, and a push-pull part is provided on the push-pull arm, which is matched with the push-pull inclined rail.

2. The suitcase handbrake device according to claim 1, characterized in that: The push-pull part is a convex cylinder arranged on the push-pull arm, and the push-pull inclined rail is a groove arranged on the connecting block, and the convex cylinder is inserted into the groove.

3. The suitcase handbrake device according to claim 1, characterized in that: The locking mechanism includes a button restricted to slide longitudinally on the shell and a button spring for driving the button to pop up, a locking column protruding at the bottom of the button, a bulging locking head end being provided at the free end of the columnar body of the locking column, and a locking plate being provided on the sliding seat, the locking plate having a fork-shaped head, the fork groove of the fork-shaped head being adapted to the columnar body of the locking column, the bottom of the fork head being provided with a locking groove corresponding to the end of the fork groove and larger than the width of the fork groove, the locking groove forming a shrinkage connected to the fork groove, the bottom end opening of the locking groove being connected with a ramp driving wall arranged at the bottom of the fork arm of the fork-shaped head, the ramp driving wall presents an inclined extension from one end close to the root of the fork arm to the free end of the fork arm to form a gradually thinning fork arm, when the columnar body of the locking column is inserted into the fork groove of the fork-shaped head, the ramp driving wall pushes the locking head end to drive the button to slide downward, and when the locking head end corresponds to the position of the locking groove, the locking head end falls into the locking groove, and the locking head end constitutes the button locking the brake push button component under the limitation of the shrinkage.

4. The suitcase handbrake device according to claim 1, characterized in that: The traction slider unit includes an active slider having the linkage part, and a driven slider having the wire connection part. The active slider and the driven slider are both configured to be restricted to slide in the shell. The active slider is provided with an accommodating space. The driven slider is placed in the accommodating space and is associated with the active slider. The active slider and the driven slider can slide relatively. The active slider is provided with a pushing part. A spiral pushing spring is provided between the pushing part and the driven slider to realize the linkage between the active slider and the driven slider.

5. The suitcase handbrake device according to claim 4, characterized in that: The pushing part is arranged opposite to the wire connecting part on the driven slider, and a wire avoidance channel is provided on the pushing part for the brake wire to pass through. One end of the spiral pushing spring abuts against the wire connecting part, and the other end of the spiral pushing spring abuts against the pushing part. The brake wire passes through the spiral pushing spring through the wire avoidance channel and is connected to the wire connecting part.

6. The suitcase handbrake device according to claim 5, characterized in that: The driven slider includes two wire connecting parts and an intermediate connecting part located between the two wire connecting parts, the intermediate connecting part connects the two hanging parts, a sliding positioning structure is provided on the intermediate connecting part, and a guide rail that cooperates with the sliding positioning structure is provided on the active slider.

7. The suitcase handbrake device according to claim 6, characterized in that: The guide rail includes a sliding guide groove, and wall panels are provided on both sides of the sliding guide groove. The sliding positioning structure includes a positioning block on the middle connecting part, the positioning block extends into the sliding guide groove and cooperates with the sliding guide groove for sliding positioning. A spacing groove is formed between the positioning block and the two hanging parts, and the wall panel is inserted into the spacing groove.

8. The suitcase handbrake device according to claim 7, characterized in that: A snap-fitting convex strip is provided at the bottom of the sliding guide groove, and an avoidance groove is provided at the bottom of the sliding guide groove on both sides of the snap-fitting convex strip. Two elastic claws arranged opposite to each other are provided on the positioning block, and the claw heads of the two elastic claws are arranged opposite to each other. A bayonet is formed between the two elastic claws. The elastic claw passes through the avoidance groove, and the bayonet is buckled on the snap-fitting convex strip, and the elastic claw and the snap-fitting convex strip can slide relatively to each other.

9. The suitcase handbrake device according to claim 7, characterized in that: The lateral sides of the accommodating space also have side panels respectively opposite to the two wall panels, and a spring accommodating groove is formed between the side panel and the adjacent wall panel. The hanging part and the spiral push spring are both placed in the spring accommodating groove, and the hanging part is guided and matched with the spring accommodating groove.

10. The suitcase handbrake device according to claim 4 or 5 or 6 or 7 or 8 or 9, characterized in that: The shell body includes a bottom shell having an assembly cavity and a cover shell covering the mouth of the assembly cavity. The assembly cavity is covered by the cover shell after the brake push button component and the traction slider unit are assembled. The accommodating space of the active slider has a bottom plate. The traction slider unit is assembled in the bottom shell with the bottom plate facing the mouth of the assembly cavity. The connecting block is arranged on the side of the active slider close to the bottom plate, so that a space is formed between the bottom of the connecting block and the bottom wall of the assembly cavity of the bottom shell, and the push-pull part corresponds to the space. When the traction slider unit is placed in and out of the assembly cavity, the push-pull part and the push-pull inclined rail are engaged and disengaged with each other.

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