CN113277391B

CN113277391B - Spliced screen for elevator

Info

Publication number: CN113277391B
Application number: CN202110705848.4A
Authority: CN
Inventors: 贺志强; 谢瑾
Original assignee: Shenzhen Hongtiansheng Information Technology Co ltd
Current assignee: Shenzhen Hongtiansheng Information Technology Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-08-12
Anticipated expiration: 2041-06-24
Also published as: CN113277391A

Abstract

The application discloses a spliced screen for an elevator, which relates to the technical field of advertisement machines and solves the problem that the elevator advertisement machine cannot adjust the position according to the requirement of subsequent use after being installed, and comprises a bottom plate, wherein the bottom plate is fixed on the side wall of the elevator, a support frame is connected to the bottom plate in a sliding manner along the horizontal direction, the support frame comprises two stop levers which are parallel to each other, the stop levers are perpendicular to the sliding direction of the support frame, a connecting rod is connected between every two adjacent stop levers, and the middle part of the connecting rod is rotatably connected with a first gear; the support frame top is connected with the mounting bracket, and the inside ladder groove that is provided with of mounting bracket, mounting bracket include two first side levers that are parallel to each other and two second side levers that are parallel to each other, and the laminating of first side lever is on the pin, and one side that is close to first gear on one of them first side lever is provided with the first rack with first gear engagement, is provided with the rotatory drive assembly of the relative connecting rod of drive first gear on the bottom plate. The application can realize convenient adjustment of the position of the advertising player after installation.

Description

Spliced screen for elevator

Technical Field

The application relates to the technical field of advertising machines, in particular to a splicing screen for an elevator.

Background

The elevator advertisement machine is a new generation intelligent device which utilizes standard display devices, televisions and other display terminals to realize information display and video advertisement playing through modes of networking, multimedia system control and the like.

Most elevator advertisement machines need be earlier with the bolt fastening on the elevator lateral wall at the in-process of installation, and the back of elevator advertisement machine is offered and is used for hanging the mouth that hangs of elevator advertisement machine, after the bolt position is fixed well, realizes being connected with the bolt through hanging the mouth with elevator advertisement machine.

In view of the above-mentioned related art, the inventor believes that the elevator advertising machine in the above-mentioned is fixed in position as a whole after the installation is completed, and cannot be adjusted in position according to the need of subsequent use.

Disclosure of Invention

In order to realize the convenient adjustment of elevator advertisement machine position after the installation, this application provides a concatenation screen for elevator.

The application provides a concatenation screen for elevator adopts following technical scheme:

a spliced screen for an elevator comprises a bottom plate, wherein the bottom plate is fixed on the side wall of the elevator, a support frame is connected to the bottom plate in a sliding mode along the horizontal direction, the support frame comprises two stop levers which are parallel to each other, the stop levers are perpendicular to the sliding direction of the support frame, a connecting rod is connected between every two adjacent stop levers, and the middle of each connecting rod is rotatably connected with a first gear; the support frame top is connected with the mounting bracket that is used for placing elevator advertisement machine, the inside ladder groove that is used for placing advertisement machine that is provided with of mounting bracket, the mounting bracket includes two first side levers that are parallel to each other and two second side levers that are parallel to each other, sets up perpendicularly between first side lever and the second side lever, and the laminating of first side lever is on the pin, and one side that is close to first gear on one of them first side lever is provided with the first rack with first gear engagement, be provided with the rotatory drive assembly of the relative connecting rod of the first gear of drive on the bottom plate.

Through adopting above-mentioned technical scheme, install the advertisement machine on the mounting bracket, remove through promoting the support frame, realize that the support frame drives the position of advertisement machine horizontal direction and remove, when the ascending position of needs adjustment advertisement machine vertical direction, make the first gear of drive assembly drive rotatory, make and move in the relative support frame vertical direction of first rack with first gear engagement, thereby the ascending position of adjustment advertisement machine vertical direction, thereby make the advertisement machine of installation completion according to subsequent needs, carry out the follow-up adjustment of advertisement machine position.

Optionally, the drive assembly includes the second gear of being connected with first gear and the rotatory driving piece of the relative connecting rod of drive second gear, first gear axle center is connected with the pivot that extends towards the bottom plate direction, the center of second gear is connected in the pivot, one side that the second gear is close to the bottom plate is connected with first forked tail piece, second gear and first forked tail piece swivelling joint, supply the gliding first dovetail of first forked tail piece to be seted up in the position that corresponds first forked tail piece on the bottom plate.

Through adopting above-mentioned technical scheme, through the setting of second gear for the second gear drives the relative connecting rod rotation of first gear when rotatory under the effect of driving piece, thereby realizes the driving action of first gear to first rack, realizes the ascending removal of mounting bracket vertical side, because first dovetail piece is installed to one side that the second gear is close to the bottom plate, makes the second gear realize the removal of horizontal direction along the extending direction of first dovetail.

Optionally, the second gear is located between the connecting rod and the bottom plate, the driving piece is a second rack meshed with the second gear, the second rack moves in the horizontal direction relative to the bottom plate, one side, facing the bottom plate, of the second rack is connected with a second dovetail block, and a second dovetail groove for enabling the second dovetail block to slide is formed in the bottom plate.

Through adopting above-mentioned technical scheme, through the relative ascending removal of bottom plate horizontal direction of second rack, realize the drive effect of second rack to the second gear to realize the rotation of the relative connecting rod of second gear.

Optionally, the second rack is symmetrically arranged on the upper side and the lower side of the second gear.

By adopting the technical scheme, through the arrangement of the two second racks, when the two second racks are pulled to the same direction, the second gear does not rotate, so that the support frame moves in the horizontal direction relative to the bottom plate; when the two second racks move in opposite directions, the second racks drive the second gear, so that the second gear rotates relative to the connecting rod, and the mounting rack moves in the vertical direction.

Optionally, the second gear is located between the connecting rod and the bottom plate, the driving piece is a worm meshed with the second gear, the worm is rotatably connected to the bottom plate, and mounting seats for the worm to rotate are arranged at two ends of the bottom plate, corresponding to the worm.

Through adopting above-mentioned technical scheme, through the rotation of worm to can realize the drive effect of worm to the second gear, when making the worm rotatory, drive the second gear rotatory, realize the adjustment of the vertical direction position of mounting bracket, when the position of support frame horizontal direction needs to be adjusted, promote the removal of support frame relative bottom plate horizontal direction, thereby can realize the adjustment of support frame horizontal position, at the in-process of support frame relative bottom plate horizontal movement, the second gear drive worm is rotatory.

Optionally, the worms are symmetrically arranged on the upper side and the lower side of the second gear, and the two worms can rotate in the same direction or in opposite directions relative to the mounting seat.

Through adopting above-mentioned technical scheme, when two worms syntropy rotated, realize the horizontal slip of the relative two worm length direction of second gear, when the direction of rotation of two worms was opposite, the drive second gear was rotatory to realize the adjustment of mounting bracket vertical direction position.

Optionally, four apex angle departments of bottom plate are provided with the supporting shoe that is used for supporting the bottom plate, bottom plate bottom threaded connection has the screw rod that extends to the inside of second dovetail, the screw rod extends to the inside one end butt of second dovetail on second dovetail, the one end that the second dovetail was kept away from to the screw rod is provided with the carousel, the carousel extends to the outside border of bottom plate.

Through adopting above-mentioned technical scheme, through the setting of screw rod, when the advertisement machine removed to required position, remove to the direction that is close to second dovetail block through carousel drive screw rod to can realize that the screw rod is fixed to second dovetail block, be convenient for fix the position of advertisement machine.

Optionally, be provided with the butt piece that is used for butt advertisement machine on the first side lever, the butt piece is connected with and link up to the outside inserted bar of first side lever, the outside one end of first side lever is arranged in to the inserted bar is provided with the gag lever post, the cover is equipped with the spring on the inserted bar, the both ends of spring butt respectively at the inside wall of butt piece and first side lever.

Through adopting above-mentioned technical scheme, through the setting of butt piece, when the position of ladder groove was arranged in to the advertisement machine, butt piece butt was along the position at the side of advertisement machine upper surface, and the spring diastole promotes the position removal of butt piece to the mounting bracket middle part to the realization is to the location of advertisement machine.

In summary, the present application includes at least one of the following benefits:

1. the advertising machine is arranged on the mounting frame, the support frame is pushed to move, the support frame drives the advertising machine to move in the horizontal direction, when the position of the advertising machine in the vertical direction needs to be adjusted, the driving assembly drives the first gear to rotate, the first rack meshed with the first gear moves in the vertical direction relative to the support frame, and therefore the position of the advertising machine in the vertical direction is adjusted, and the mounted advertising machine can perform subsequent adjustment on the position of the advertising machine according to subsequent needs;

2. through the setting of second gear for when the second gear is rotatory under the effect of driving piece, it is rotatory to drive the relative connecting rod of first gear, thereby realizes the drive effect of first gear to first rack, realizes the ascending removal of mounting bracket vertical side, because first dovetail block is installed to one side that the second gear is close to the bottom plate, makes the second gear realize the removal of horizontal direction along the extending direction of first dovetail.

Drawings

FIG. 1 is a schematic structural view of the overall structure of the first embodiment;

FIG. 2 is an exploded view of a highlighted scaffolding structure according to an embodiment;

FIG. 3 is an exploded view of a raised floor structure according to one embodiment;

FIG. 4 is a schematic view of a highlighted mount structure of the embodiment;

FIG. 5 is a schematic cross-sectional view of a backplane structure according to an embodiment;

FIG. 6 is an enlarged schematic view at A in FIG. 2;

FIG. 7 is an enlarged schematic view at B of FIG. 1;

FIG. 8 is a schematic structural view of a base plate according to the second embodiment;

FIG. 9 is a diagram illustrating the adjustment status of the second embodiment.

Description of reference numerals: 1. a base plate; 11. a support block; 12. a first dovetail groove; 13. a second dovetail groove; 2. a bolt; 3. a support frame; 31. a stop lever; 311. a containing groove; 312. a chute; 32. a connecting rod; 4. a mounting frame; 41. a first side bar; 411. a positioning bar; 42. a second side bar; 43. a stepped groove; 5. a first gear; 51. a limiting plate; 6. a rotating shaft; 7. a second gear; 8. a first dovetail block; 9. a first rack; 10. a second rack; 14. a second dovetail block; 141. a limiting groove; 15. a limiting sheet; 16. a screw; 161. a turntable; 17. a butting block; 171. a bevel; 18. inserting a rod; 19. a limiting rod; 20. a spring; 21. a worm; 22. a mounting seat; 23. a motor; 24. an advertising machine; 25. and a bearing.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

The first embodiment is as follows:

the embodiment of the application discloses a splicing screen for an elevator. Referring to fig. 1 and 2, the advertising machine for the elevator comprises a bottom plate 1, wherein supporting blocks 11 are welded at four corners of one side of the bottom plate 1 facing an elevator side wall, the bottom plate 1 is fixed on the elevator side wall by using bolts 2, and the bolts 2 are fixed at the positions of the supporting blocks 11. A supporting frame 3 is installed above the bottom plate 1, the supporting frame 3 moves in the horizontal direction relative to the bottom plate 1, an installation frame 4 used for positioning an advertising machine 24 is installed on the supporting frame 3, and the advertising machine 24 is installed on the installation frame 4.

Referring to fig. 3 and 4, the supporting frame 3 includes two stop levers 31 perpendicular to the moving direction of the supporting frame 3, a connecting rod 32 is connected between two adjacent stop levers 31, the connecting rod 32 is located at the middle position of the stop lever 31, a first gear 5 is disposed on one side of the supporting frame 3 away from the bottom plate 1, a driving assembly for driving the first gear 5 to rotate relative to the connecting rod 32 is disposed on the bottom plate 1, the driving assembly includes a rotating shaft 6 of the connecting rod 32 and a second gear 7 disposed at the axis of the first gear 5, the second gear 7 is connected to the position where the rotating shaft 6 extends to the middle of the supporting frame 3 and the bottom plate 1, the rotating shaft 6 is connected to the axis of the second gear 7, one side of the rotating shaft 6 close to the bottom plate 1 penetrates through the second gear 7, one end of the rotating shaft 6 penetrating through the second gear 7 is rotatably connected to the first dovetail block 8, a bearing 25 is disposed between the rotating shaft 6 and the first dovetail block 8, a first dovetail groove 12 for the first dovetail block 8 to slide is disposed at the position of the bottom plate 1 corresponding to the first dovetail block 8, when the first dovetail block 8 is in inserted fit with the first dovetail groove 12, the first dovetail block 8 moves inside the first dovetail groove 12, and the movement of the entire support frame 3 in the horizontal direction is realized.

Referring to fig. 3 and 4, a containing groove 311 for bearing the mounting frame 4 is formed in one side of the stop lever 31 close to the connecting rod 32, the mounting frame 4 includes two first side levers 41 and two second side levers 42, the two first side levers 41 are parallel to each other, the two second side levers 42 are parallel to each other, and the first side levers 41 are all perpendicular to the second side levers 42, so that a placing portion is formed between the two first side levers 41 and the two second side levers 42.

Referring to fig. 3 and 4, the first side lever 41 is attached to the stop lever 31, the first gear 5 is disposed at the middle of the mounting frame 4, a first rack 9 is fixedly bonded to one side of the first side lever 41 close to the first gear 5, the first rack 9 is meshed with the first gear 5, and when the first gear 5 rotates relative to the connecting rod 32, the first rack 9 meshed with the first gear 5 is driven to move relative to the first gear 5, so that the position of the mounting frame 4 in the vertical direction is adjusted.

Referring to fig. 4, one side welded fastening of the first side lever 41 attached to the stop lever 31 has a positioning bar 411, and a sliding groove 312 for sliding the positioning bar 411 is provided at a position of the stop lever 31 corresponding to the positioning bar 411, so that the moving direction of the mounting frame 4 is guided by the positioning bar 411 and the sliding groove 312.

Referring to fig. 1 and 4, the stepped groove 43 for bearing the advertisement player 24 is disposed on the inner side of the mounting bracket 4, the height of the first rack 9 is set to be lower than the bottom of the stepped groove 43, a limiting plate 51 is welded on one side of the first gear 5 away from the second gear 7, the diameter of the limiting plate 51 is greater than that of the first gear 5, when the first gear 5 is matched with the mounting bracket 4, the limiting plate 51 is lapped on the side wall of the first rack 9 away from the second gear 7, so that the upper plate surface of the limiting plate 51 is located on the same horizontal plane as the bottom of the stepped groove 43, and the mounting bracket 4 is not easily separated from the second gear 7.

Referring to fig. 4 and 5, a driving member for driving the second gear 7 to rotate is disposed on the bottom plate 1, the driving member is a second rack 10 disposed on the bottom plate 1 and engaged with the second gear 7, a second dovetail block 14 is welded and fixed on one side of the second rack 10 close to the bottom plate 1, a second dovetail groove 13 for the second dovetail block 14 to slide is disposed on the bottom plate 1 corresponding to the second dovetail block 14, the second racks 10 are symmetrically disposed on the upper and lower sides of the second gear 7, such that both the second racks 10 are engaged with the second gear 7, when the two second racks 10 move in the same direction, the second gear 7 is driven to move horizontally relative to the bottom plate 1, when the two second racks 10 move in opposite directions, it is realized that the two second racks 10 drive the second gear 7 to rotate, when the second gear 7 rotates, the first rack 9 is driven to move, so that the position of the mounting rack 4 in the vertical direction is adjusted.

Referring to fig. 3 and 6, a limiting groove 141 is formed in one side of the second dovetail block 14 close to the first dovetail groove 12, two ends of the limiting groove 141 do not penetrate through the second dovetail block 14, a limiting piece 15 is arranged at one end of the bottom plate 1, and the limiting piece 15 is fixed on the side wall of the bottom plate 1 by using a bolt 2. In the process of installing the second dovetail block 14, the second dovetail block 14 is first inserted into the second dovetail groove 13 and then the limiting piece 15 is inserted into the limiting groove 141, and the limiting piece 15 is fixed to the side wall of the bottom plate 1 by using the bolt 2.

Referring to fig. 5 and 6, in the process that the second dovetail block 14 drives the second rack 10 to move relative to the second dovetail groove 13, the limiting piece 15 limits the second rack 10, so that the second rack 10 is always connected with the base plate 1.

Referring to fig. 5, a screw 16 extending into the second dovetail groove 13 is connected to the bottom of the bottom plate 1 in a threaded manner, and when the second dovetail block 14 is disposed in the second dovetail groove 13, an end of the screw 16 abuts against the second dovetail block 14, and the screw 16 is abutted in a direction approaching the second dovetail block 14, so that the position of the second gear 7 is fixed. The side of the screw 16 far away from the bottom plate 1 is welded with a rotary plate 161, and the side of the rotary plate 161 extends to the outside of the bottom plate 1, so that the screw 16 is operated by rotating the rotary plate 161.

Referring to fig. 3 and 4, in the process of carrying out the integral erection, with first gear 5 and pivot 6 welded fastening, at first with first gear 5 and the cooperation of pegging graft of mounting bracket 4, make limiting plate 51 overlap joint on the last face of first rack 9, later run through connecting rod 32 with pivot 6, run through first dovetail block 8 in pivot 6 one end of connecting rod 32, the bearing 25 is established to the cover on the pivot 6, the inner circle and the pivot 6 welded fastening of bearing 25, welded fastening between the outer lane of bearing 25 and first dovetail block 8, make second gear 7 take place to rotate relative to first dovetail block 8.

Referring to fig. 5 and 6, the two second racks 10 are in plug fit with the second dovetail grooves 13 through the second dovetail blocks 14, the second gear 7 is limited in moving displacement through the limiting pieces 15, then the two second racks 10 are pulled to the outside of the base plate 1, the second gear 7 is placed between the two second racks 10 and synchronously pushed to the base plate 1, and integral installation is achieved.

Referring to fig. 1 and 7, an abutting block 17 for abutting against the advertisement machine 24 is arranged on the second side lever 42, an inserting rod 18 penetrating to the outside of the first side lever 41 is welded on one side of the abutting block 17 far away from the middle of the mounting frame 4, a limiting rod 19 is welded on one end of the inserting rod 18 extending to the outside of the second side lever 42, a spring 20 is sleeved on one end of the inserting rod 18 arranged in the mounting frame 4, two ends of the spring 20 abut against the inner side walls of the abutting block 17 and the second side lever 42 respectively, an inclined surface 171 which is inclined downwards from a position far away from the middle of the mounting frame 4 to a position close to the middle of the mounting frame 4 is arranged on the abutting block 17, when the advertisement machine 24 is connected with the mounting frame 4, the abutting block 17 extrudes the abutting block 17 to move towards a direction far away from the center of the mounting frame 4, when the advertisement machine 24 abuts against the position of the stepped groove 43 of the mounting frame 4, the abutting block 17 moves towards a direction close to the middle of the mounting frame 4 under the action of the spring 20, so that the abutting block 17 abuts on the upper plate surface of the advertising machine 24, thereby realizing the fixation of the advertising machine 24.

Referring to fig. 1 and 7, the number of the abutting blocks 17 is three along the length direction of the second side rod 42, and the abutting blocks 17 are mounted on the second side rods 42 at the upper and lower sides, so that the advertisement machine 24 is stably fixed.

The implementation principle of this application embodiment splicing screen for elevator does:

when the position of the advertising machine 24 is adjusted and the position of the advertising machine 24 in the horizontal direction needs to be adjusted, the two second racks 10 are pulled simultaneously, so that the two second racks 10 clamp the second gear 7 to move in the horizontal direction relative to the bottom plate 1, when the position of the advertising machine 24 in the vertical direction needs to be adjusted, the two second racks 10 are pulled in opposite directions, so that the second gear 7 arranged between the two second racks 10 rotates relative to the connecting rod 32, the first gear 5 is driven to rotate by the connection and fixation of the rotating shaft 6 between the second gear 7 and the first gear 5, the first gear 5 is driven to rotate, the first rack 9 meshed with the first gear 5 is driven to move, so that the position of the advertising machine 24 in the vertical direction is adjusted, when the advertising machine 24 moves to the required position, the screw 16 is driven to rotate by the turntable 161, so that the screw 16 is tightly abutted to the second dovetail block 14, the position of the second gear 7 is fixed.

The second embodiment is different from the first embodiment in that, as shown in fig. 8 and 9, worms 21 engaged with the second gear 7 are installed on the upper and lower sides of the second gear 7, mounting seats 22 for rotatably connecting the worms 21 are welded on both ends of the base plate 1 corresponding to the length direction of the worms 21, when the worms 21 rotate in the same direction, the second gear 7 is driven to move along the horizontal direction of the base plate 1, when the rotating directions of the worms 21 are opposite, the rotation of the second gear 7 is driven, and a motor 23 for driving the worm 21 to rotate is installed on the end of each worm 21, and the worm 21 is driven to rotate relative to the mounting seat 22 by the motor 23.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an elevator is with concatenation screen which characterized in that: the elevator car door locking device comprises a bottom plate (1), wherein the bottom plate (1) is fixed on the side wall of an elevator, a support frame (3) is connected to the bottom plate (1) in a sliding mode along the horizontal direction, the support frame (3) comprises two stop levers (31) which are parallel to each other, the stop levers (31) are perpendicular to the sliding direction of the support frame (3), a connecting rod (32) is connected between every two adjacent stop levers (31), and the middle of each connecting rod (32) is rotatably connected with a first gear (5); the elevator advertising machine is characterized in that a mounting frame (4) used for placing an elevator advertising machine (24) is connected above the supporting frame (3), a stepped groove (43) used for placing the elevator advertising machine (24) is formed in the mounting frame (4), the mounting frame (4) comprises two first side rods (41) which are parallel to each other and two second side rods (42) which are parallel to each other, the first side rods (41) and the second side rods (42) are vertically arranged, the first side rods (41) are attached to the stop lever (31), a first rack (9) meshed with the first gear (5) is arranged on one side, close to the first gear (5), of one first side rod (41), and a driving assembly for driving the first gear (5) to rotate relative to the connecting rod (32) is arranged on the bottom plate (1); the driving assembly comprises a second gear (7) connected with the first gear (5) and a driving piece for driving the second gear (7) to rotate relative to the connecting rod (32), the axis of the first gear (5) is connected with a rotating shaft (6) extending towards the direction of the bottom plate (1), the rotating shaft (6) is connected with the center of the second gear (7), one side, close to the bottom plate (1), of the second gear (7) is connected with a first dovetail block (8), the second gear (7) is rotationally connected with the first dovetail block (8), and a first dovetail groove (12) for the first dovetail block (8) to slide is formed in the position, corresponding to the first dovetail block (8), of the bottom plate (1); the second gear (7) is positioned between the connecting rod (32) and the bottom plate (1), the driving piece is a second rack (10) meshed with the second gear (7), the second rack (10) moves in the horizontal direction relative to the bottom plate (1), one side, facing the bottom plate (1), of the second rack (10) is connected with a second dovetail block (14), and a second dovetail groove (13) for the second dovetail block (14) to slide is formed in the bottom plate (1); the second racks (10) are symmetrically arranged on the upper side and the lower side of the second gear (7).

2. The spliced screen for elevators according to claim 1, wherein: the second gear (7) is located between the connecting rod (32) and the bottom plate (1), the driving piece is a worm (21) meshed with the second gear (7), the worm (21) is rotatably connected to the bottom plate (1), and mounting seats (22) for the worm (21) to rotate are arranged at two ends of the bottom plate (1) corresponding to the worm (21).

3. The spliced screen for an elevator as set forth in claim 2, wherein: the worms (21) are symmetrically arranged on the upper side and the lower side of the second gear (7), and the two worms (21) can rotate in the same direction or in opposite directions relative to the mounting seat (22).

4. The spliced screen for elevators according to claim 1, wherein: four apex angle departments of bottom plate (1) are provided with supporting shoe (11) that are used for supporting bottom plate (1), bottom plate (1) bottom threaded connection has screw rod (16) that extend to second dovetail (13) inside, screw rod (16) extend to the inside one end butt of second dovetail (13) on second dovetail piece (14), the one end that second dovetail (13) were kept away from in screw rod (16) is provided with carousel (161), carousel (161) extend to the outside border of bottom plate (1).

5. The spliced screen for elevators according to claim 1, wherein: be provided with butt piece (17) that are used for butt advertisement machine (24) on first side lever (41), butt piece (17) are connected with and link up to outside inserted bar (18) of first side lever (41), the outside one end of first side lever (41) is arranged in inserted bar (18) is provided with gag lever post (19), the cover is equipped with spring (20) on inserted bar (18), the both ends difference butt of spring (20) are at the inside wall of butt piece (17) and first side lever (41).