CN113653409A

CN113653409A - Multi-point linkage locking crank latch body system

Info

Publication number: CN113653409A
Application number: CN202111026094.6A
Authority: CN
Inventors: 周发展; 王金平; 石燕红
Original assignee: Suzhou D Snap Technologies Co ltd
Current assignee: Suzhou D Snap Technologies Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2021-11-16

Abstract

A multi-point linkage locking crank latch system including a crank lock, at least one linkage, and a plurality of latch body assemblies; the connecting rod is connected with the plurality of bolt body assemblies and the crank lock, and the connecting rod is driven by the crank lock to advance and retreat along the length direction of the connecting rod so as to drive each bolt body assembly to act; after the bolt body assembly on the crank lock is connected with the connecting rod, at least one bolt body assembly is additionally connected in the length extending direction of the connecting rod; each bolt body assembly comprises a shell, a gear component, a rack component, an elastic piece, a pin, a lock rod and a lock tongue; the housing has at least one passage therethrough for the rack member, the passage having at least one opening, the at least one rack member being selectively mounted into the passage from one of the openings. This scheme is through setting up a crank lock and a plurality of bolt body group spare on the cabinet door for can realize the multiple spot locking during the cabinet door locking, prevent that the cabinet door from deforming, promote leakproofness, the security of cabinet door, satisfy IPX5, the EMC shielding requirement to the cabinet door with this.

Description

Multi-point linkage locking crank latch body system

Technical Field

The invention relates to a lock, in particular to a locking mechanism of a crank lock, which comprises a straight pull type crank lock and a rotary type crank lock, is suitable for locking doors, cabinets and other objects, and is particularly suitable for locking an electrical control cabinet.

Background

The crank lock is widely applied to the fields of industrial cabinets, engineering mechanical equipment, communication, medical technology, refrigeration, food industry, environmental technology, rail locomotives and the like due to the advantages of small occupied space and high protection level. The crank lock commonly used at present comprises a body base and a handle, wherein a locking mechanism is arranged between the handle and the body base, and the handle is locked on the body base in a locking state; when the door is opened, the following three steps are needed: firstly, unlocking a locking mechanism between a handle and a body base, and pulling a hand away from the body base; secondly, rotating the handle under the state that the handle is separated from the body base, and rotating the handle clockwise or anticlockwise by 90 degrees to unlock the crank lock; and thirdly, pulling the door open.

On some cabinet bodies applying the crank lock, certain dustproof and waterproof requirements and certain EMC (electromagnetic compatibility) shielding requirements are met, and due to the fact that some cabinet doors are large and easy to deform, when the conventional crank lock is used for locking, gaps of the cabinet doors are uneven, the gaps in the middle are small, the gaps in two sides are large, and therefore the shielding requirements for IPX5 and EMC of the cabinet doors cannot be met.

In order to solve the above problems, the existing lock manufacturers design multi-point linkage locks, and can lock the cabinet door at multiple points through one set of locking system, but in the process of implementing the present invention, the inventor finds that the existing multi-point linkage locking system at least has the following problems:

1. in the existing multipoint linkage locking system lockset, a main driving bolt body part used for manual control and a passive bolt body part used for linkage with the main driving bolt body part mostly adopt different structures, so that inconvenience is brought to design, production, installation, maintenance, repair and the like of a multipoint linkage locking system, the design and production cost is high, and operators are required to face different structures during installation, maintenance and repair;

2. the control of the lock tongue in a common multipoint linkage locking system only controls the rotation of the lock tongue and does not control the tensioning of the lock tongue, so that a gap can exist in a cabinet door in a locking state; in some fields such as a sliding door system of a high-speed rail motor train unit, a single-point pneumatic pressing locking device and a linkage pneumatic pressing locking device can be arranged, and a door leaf can be tensioned during locking.

Therefore, how to solve the above-mentioned deficiencies of the prior art is a subject to be studied and solved by the present invention.

Disclosure of Invention

The invention aims to provide a multi-point linkage locking crank latch system.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention discloses a multi-point linkage locking crank lock bolt system, which is used for multi-point linkage locking of a cabinet door, and defines the inner side of the cabinet door as a left side and the outer side of the cabinet door as a right side, and has the innovation points that:

the bolt body system comprises a crank lock, at least one connecting rod and a plurality of bolt body components;

the crank lock comprises a handle, a locking mechanism and a body base; the upper end of the handle is a rotating end and is rotatably connected to the upper end of the body base, and the lower end of the handle is a locking end; the locking mechanism is arranged at the lower end of the body base and matched with the locking end of the handle to lock and unlock the handle; one of the bolt body assemblies is arranged in the body base and is matched with the rotating end of the handle to lock and unlock the bolt body system;

the connecting rod is connected with the plurality of bolt body assemblies and the crank lock, and the connecting rod is driven by the crank lock to advance and retreat along the length direction of the connecting rod so as to drive each bolt body assembly to act; after the bolt body assembly on the crank lock is connected with the connecting rod, at least one bolt body assembly is additionally connected in the length extending direction of the connecting rod;

each bolt body assembly comprises a shell, a gear component, a rack component, an elastic piece, a pin, a lock rod and a lock tongue; wherein the content of the first and second substances,

the housing having at least one passage therethrough for the rack member, the passage having at least one opening, the at least one rack member being selectively mounted into the passage from one of the openings;

the gear component is positioned and penetrated in the shell in the left-right direction and only rotates relative to the shell through limiting; the gear component comprises a gear body and a rotating action part, a gear action surface is arranged on the circumferential direction of the gear body, a gear connecting part is arranged at one end of the gear body facing the outer side of the cabinet door, and the gear connecting part is selectively matched and connected with the rotating end of the handle; a spiral groove is formed in the circumferential direction of the rotating action part, the first end of the spiral groove is close to the gear body, and the second end of the spiral groove is far away from the gear body;

the rack member is inserted from the opening direction of the channel and then meshed with the gear member, the rack member comprises a rack body and a rack connecting part, one side of the rack body facing the gear body is provided with a rack acting surface used for being meshed with the gear acting surface, and the rack acting surface is provided with a first position and a second position which are meshed with the gear body and are arranged in the length direction of the rack body; the rack connecting part is connected with the connecting rod in a positioning way;

the lock rod is arranged in the rotation action part in a left-right direction in a penetrating mode, an elastic piece is sleeved between the lock rod and the rotation action part, and the elastic piece acts between the lock rod and the gear component to enable the lock rod to keep the trend of leftward displacement; the pin vertically penetrates through the lock rod, and in the assembly state of the gear member and the lock rod, the end part of the pin extends out of the lock rod and then extends into the spiral groove, so that the lock rod is driven to move in the left-right direction and rotate in the circumferential direction through the matching of the pin and the spiral groove when the gear member rotates;

the left end of the lock rod is provided with a fastening part, and the fastening part extends towards the left side of the shell and is fixedly connected with the lock tongue;

the bolt body system is configured to:

in a locking state, the end parts of the pins in all the bolt body assemblies are positioned at the first ends of the spiral grooves, the handle of the crank lock is in an initial locking position, the rack members in the bolt body assemblies on the crank lock are positioned at the second positions meshed with the gear body, the rack members in the other bolt body assemblies are positioned at the first positions or the second positions meshed with the gear body, and the lock tongue presses the cabinet door;

in an unlocking state, the handle of the crank lock is in an unlocking position, the rotating end of the handle drives the gear member to rotate, the rack member in the latch body assembly on the crank lock is positioned at a first position meshed with the gear body, the rack members in the other latch body assemblies are positioned at a second position or a first position meshed with the gear body after the linkage connecting rod advances and retreats, the pin is forced to move to the second end of the spiral groove by the spiral groove, and the pin drives the lock rod to rotate and displace so that the lock bolt rotates and is separated from the cabinet door.

The invention is explained below:

1. in the scheme, the crank lock and the bolt body assemblies are arranged on the cabinet door, so that the cabinet door can be locked at multiple points when being locked, the cabinet door is prevented from being deformed, the sealing performance and the safety of the cabinet door are improved, and the shielding requirements on IPX5 and EMC of the cabinet door are met; through the design of the bolt body assembly, the bolt body assembly can be used on a crank lock and an independent bolt body assembly for multi-point locking, the design, production, installation, maintenance and repair costs are reduced, the convenience is improved, and the multi-point linkage locking and unlocking of the crank lock are completed by one bolt body assembly; this bolt body subassembly must use the gear component ingeniously, the rack component and corresponding elastic component, the pin, the cooperation of locking lever, can be at taut spring bolt under the locking state, possess taut function, further promote security, the leakproofness of cabinet door, this bolt body subassembly has carried out ingenious, effectual combination with gear structure and taut structure, makes this bolt body system can possess taut function under the prerequisite that the structure is fairly simple, the cost is fairly low, make the cabinet door lock completely.

2. In the above scheme, a rack limiting surface in the same direction as the insertion direction of the rack member into the channel is arranged on the rack body; aiming at the rack limiting surface, a rack abutting surface which is opposite to the direction of the rack member inserted into the channel is arranged on the shell, and the rack limiting surface abuts against the rack abutting surface so as to limit the stroke of the rack member inserted into the channel; therefore, the forming position of the rack member insertion channel is limited, the uniformity of the rack member insertion length is ensured, the action height of each identical bolt body assembly is uniform during linkage, and the accuracy and the stability of a bolt body system are improved.

3. In the above scheme, one of the channel and the rack body is provided with the sliding chute, the other one is provided with the sliding block corresponding to the sliding chute, and the sliding chute is matched with the sliding block to form a moving path of the rack member in the channel, so that the rack member can better slide on one side and be meshed with the gear member under the driving of the connecting rod in the channel, the stability of the latch body assembly during operation is improved, and the rack member can be ensured to well slide along the moving path.

4. In the above scheme, the inside fixing base that is used for passing the fastener that is provided with of casing, the fixing base makes the bolt body subassembly fix on the cabinet door or on the crank lock after passing the fastener, it is provided with the slider or the spout that correspond with spout or slider on the passageway to correspond on the fixing base, the fixing base is located the removal route of passageway wherein, with this make the overall structure of bolt body subassembly compacter, reduce the whole volume of bolt body subassembly, when reducing, simplifying the structure, still possess the expansion function, for example the fixing base possesses the function that is used for with other parts fixed promptly, also possess the limiting displacement who is used for improving the stability when bolt body subassembly moves as rack component in the slide.

5. In the above scheme, in one of the passages, the sliding grooves or the sliding blocks are arranged in parallel, the sliding grooves or the sliding blocks are arranged in a plurality of numbers, the sliding grooves or the sliding blocks are arranged according to the positions of the corresponding passages on the shell, for example, the cavity and the supporting body are arranged on the shell, the sliding grooves or the sliding blocks are arranged at the corresponding positions of the cavity and the supporting body, the parts in the shell corresponding to the passages are effectively utilized, the parts on the path of the passage are designed into the sliding grooves or the sliding blocks for guiding and limiting, the design is ingenious, the sliding of the rack member is accurate, and the accuracy and the stability of meshing with the gear member are improved.

6. In the above scheme, the channel has two openings formed at two ends along the length direction of the channel, at least one rack member is selectively installed in the channel from at least one of the openings, or the two rack members can be respectively inserted from two openings of one channel, the inserted rack members do not interfere with each other, the two rack members can be meshed and slide with the gear member at respective opening angles, and the rack members drive the rack members inserted into two different openings in one channel to be meshed and driven, so that the corresponding transmission, locking and unlocking purposes are achieved.

7. In the above scheme, two rows of parallel sliding grooves or sliding blocks are arranged along the path direction of the channel, the number of the corresponding sliding blocks or sliding grooves on the rack body is one row, and two parallel rack components can be oppositely arranged in one channel in a penetrating manner.

8. In the scheme, four channels are arranged in one shell, the four channels penetrate through the shell and are arranged in parallel in pairs, and the channels are positioned on the extension line of the rotating tangent plane of the gear body; more specifically, two channels of one set run through the long side of the rectangular housing, and two channels of the second set run through the short side of the rectangular housing, and the first set of channels can be perpendicular to the long side of the housing, and can also be designed to be inclined to the long side of the housing, as long as the channels are arranged around the extension line of the rotation tangent plane of the gear body, and generally perpendicular is preferred.

9. In the above aspect, the latch body assemblies are selectively arranged in parallel or perpendicular to the length extension direction of the connecting rod, the direction of the channel between two connected latch body assemblies in the previous latch body assembly and the next latch body assembly is parallel or perpendicular, and the rack members are inserted into the parallel or perpendicular channels, so that the moving direction of the rack members is parallel or perpendicular. The arrangement of the bolt body assembly can be a linear multipoint linkage bolt body system parallel to the length extension direction of the connecting rod, and the bolt body drives the connecting rod to advance and retreat along the same parallel direction; the bolt body assembly can also be arranged into a 90-degree-angle multi-point linkage bolt body system which is vertical to the length extension direction of one of the connecting rods, at the moment, a pair of adjacent bolt body assemblies are vertically arranged, the connecting rod connected with the previous bolt body assembly is vertical to the connecting rod connected with the next bolt body assembly, and when the connecting rod of the previous bolt body assembly drives the rack member to transmit along the a direction, the rack member in the next bolt body assembly can be driven to transmit along the direction vertical to the a direction.

10. In the scheme, the bolt body system further comprises a joint, wherein one end of the joint is connected with the connecting rod in a positioning mode, and the other end of the joint is connected with the rack connecting part in a positioning mode; the connecting rod is provided with a cylindrical rod body, and a rack connecting part of the rack component is in a square shape; the joint is provided with a first space for inserting the rod body and a second space for inserting the rack connecting part, a deformable semicircular groove body is arranged in the first space, a stop block is arranged at the joint of the first space and the second space, one side of the stop block is connected with the joint, the other side of the stop block is disconnected with the joint, an opening is formed in the second space towards one side of the rack member, and fastening holes are formed in the inner walls of the two sides of the opening; under the assembly state of the joint, the connecting rod and the rack connecting part, the connecting rod is inserted into the first space of the joint, and the rack connecting part is inserted into the second space of the joint; a bolt penetrates through the fastening hole and the rack connecting part to form fixed connection of the rack component and the joint, and the semicircular groove body is deformed to enable the stop block to be close to the connecting rod; the connecting rod is propped against the semicircular groove body and the stop block to form fixed connection between the connecting rod and the joint. The joint of the structure that sets up can get connecting rod and rack component better, makes it fixed more firm, can satisfy the connection under the different compound mode of a plurality of bolt body subassemblies moreover, makes more general in various occasions of bolt body subassembly, realizes the modularization equipment.

11. In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, coupled between two elements, or coupled in any other manner that does not materially affect the operation of the device, unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

12. In the present invention, the terms "center", "front", "rear", "axial", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional arrangements shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

13. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Due to the application of the scheme, compared with the prior art, the invention has the following advantages and effects:

1. according to the scheme, the crank lock and the bolt body assemblies are arranged on the cabinet door, so that the cabinet door can be locked at multiple points when being locked, the cabinet door is prevented from being deformed, the sealing performance and the safety of the cabinet door are improved, and the shielding requirements of IPX5 and EMC of the cabinet door are met.

2. According to the scheme, through the design of the bolt body assembly, the bolt body assembly can be used for a crank lock and an independent bolt body assembly for multi-point locking, the design, production, installation, maintenance and repair costs are reduced, the convenience is improved, and multi-point linkage locking and unlocking of the crank lock are completed through one bolt body assembly.

3. According to the scheme, the bolt body assembly skillfully applies the matching of the gear member, the rack member, the corresponding elastic piece, the pin and the lock rod, can tension the lock tongue in a locking state, has a tensioning function, and further improves the safety and the sealing performance of the cabinet door.

4. According to the scheme, due to the universal design of the bolt body assembly, the multipoint linkage mode of the bolt body system can be more diversified, when the multipoint linkage structure is designed, the application of the bolt body assembly can realize modular application, the multipoint linkage mode is simpler and more convenient to design, the multipoint linkage structure is more convenient to arrange, and all parts which are completely universal can be combined freely.

Drawings

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

FIG. 2 is a perspective view of a latch body assembly in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the latch body assembly in operation in accordance with an embodiment of the present invention;

FIG. 4 is an exploded view of the bolt body assembly in an embodiment of the present invention;

FIG. 5 is a schematic structural view of a housing in the latch body assembly of an embodiment of the present invention;

FIG. 6 is a schematic illustration of the construction of the gear member in the latch body assembly in accordance with an embodiment of the present invention;

FIG. 7 is a schematic structural view of a rack member in the latch body assembly of an embodiment of the present invention;

FIG. 8 is a schematic structural view of a joint in the latch body assembly according to an embodiment of the present invention;

FIG. 9 is a cross-sectional view of the latch body assembly under tension in an embodiment of the present invention;

FIG. 10 is a side schematic view of a bolt assembly in a tensioned condition in accordance with an embodiment of the present invention;

FIG. 11 is a cross-sectional view of the latch body assembly in an unlocked condition in accordance with an embodiment of the present invention;

FIG. 12 is a side elevational view of the latch body assembly in an unlocked condition in accordance with an embodiment of the present invention;

FIG. 13 is a perspective view of an embodiment of the present invention in an initial closed state;

FIG. 14 is a right side view of an embodiment of the present invention in an initial closed position;

FIG. 15 is a front view of an embodiment of the present invention in an initial closed state;

FIG. 16 is a left side view of an embodiment of the present invention in an initial closed position;

FIG. 17 is a schematic perspective view of an embodiment of the present invention in which a key is rotated 180 degrees counterclockwise to unlock the crank lock during unlocking;

FIG. 18 is a perspective view of the embodiment of the present invention lifting the handle of the crank lock during unlocking;

FIG. 19 is a schematic perspective view of the embodiment of the present invention showing the latch bolt bouncing and disengaging from the cabinet door in a fully unlocked state after the crank lock is rotated during unlocking;

FIG. 20 is a perspective view of an embodiment of the present invention in an initial open position;

FIG. 21 is a right side view of an embodiment of the present invention in an initial open position;

FIG. 22 is a front view of an embodiment of the present invention in an initial open state;

FIG. 23 is a left side view of an embodiment of the present invention in an initial open position;

FIG. 24 is an isometric view of the latch body assembly with the handle rotated 180 clockwise during latching in accordance with an embodiment of the present invention;

FIG. 25 is a schematic perspective view of the latch bolt of each latch body assembly rotating together to the inside of the cabinet door during locking in accordance with an embodiment of the present invention;

FIG. 26 is a perspective view of the embodiment of the present invention showing the handle of the crank lock being depressed during a locking operation;

FIG. 27 is a schematic perspective view of a lock with a crank handle locked by rotating a key 180 degrees clockwise according to an embodiment of the present invention during locking

FIG. 28 is a schematic illustration of the arrangement of one of the latch body assemblies arranged perpendicular to the crank lock in accordance with the embodiment of the present invention;

FIG. 29 is a schematic view of the latch body assembly connection configuration of FIG. 16 in the "home position";

FIG. 30 is a schematic illustration of the latch body assembly connection configuration of FIG. 16 in the "relay position";

FIG. 31 is a schematic illustration of the latch body assembly connection configuration of FIG. 16 in the "end position";

FIG. 32 is a schematic illustration of the latch body assembly connection configuration of FIG. 28 in the "relay position"; .

In the above drawings:

1. a crank lock; 11. a handle; 12. a body base; 13. a locking mechanism;

2. a latch body assembly;

21. a housing; 211. a channel; 2111. a slider; 21111. a rack abutment surface; 212. a fixed seat;

22. a gear member;

221. a gear body; 2210. a gear action surface; 2211. a gear connecting portion;

222. a rotation action part; 2220. a helical groove; 2221. a first end; 2222. a second end; 2223. a card slot;

23. a rack member;

231. a rack body; 2310. a rack action surface; 2311. a first position; 2312. a second position; 2323. a chute; 23231. a rack limiting surface;

232. a rack connecting portion;

24. an elastic member;

25. a pin;

26. a lock lever; 261. a fastening section;

27. a latch bolt;

28. a split washer;

29. an auxiliary rack;

3. a connecting rod;

4. a joint; 41. a first space; 411. a semicircular groove body; 42. a second space; 421. a fastening hole; 43. a stopper; 44. and (4) screws.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

As shown in fig. 1 to 32, a multi-point linkage locking crank latch system according to an embodiment of the present invention includes a crank lock 1, a plurality of connecting rods 3, and a plurality of latch assemblies 2, wherein the crank lock 1 and the latch assemblies 2 are fixed on a cabinet door, and the crank lock 1 is provided with the latch assembly 2; the crank lock 1 comprises a handle 11, a locking mechanism 13 and a body base 12; the upper end of the handle 11 is a rotating end and is rotatably connected to the upper end of the body base 12, and the lower end of the handle 11 is a locking end; the locking mechanism 13 is disposed at the lower end of the body base 12 and is matched with the locking end of the handle 11 to lock and unlock the handle 11 (the locking mechanism 13 is a common component of the crank lock 1 and will not be described herein); the connecting rod 3 connects a plurality of bolt assemblies 2 and the crank lock 1, and the connecting rod 3 moves forward and backward along the length direction of the connecting rod 3 under the driving of the crank lock 1 so as to operate the bolt assemblies 2; one of the latch assemblies 2 is disposed at the upper end of the body base 12 and is matched with the rotating end of the handle 11 to lock and unlock the latch system of the crank lock 1.

The connecting rod 3 is connected with a plurality of bolt assemblies 2 and the crank lock 1, and the connecting rod 3 is driven by the crank lock 1 to advance and retreat along the length direction of the connecting rod 3 so as to drive each bolt assembly 2 to act; after the bolt body assembly 2 on the crank lock 1 is connected with the connecting rod 3, at least one bolt body assembly 2 is additionally connected in the length extending direction of the connecting rod 3;

each of the bolt body assemblies 2 comprises a shell 21, a gear member 22, a rack member 23, an elastic piece 24, a pin 25, a lock rod 26 and a lock tongue 27; wherein the content of the first and second substances,

the housing 21 has at least one channel 211 through which the rack member 23 passes, the channel 211 having at least one opening, and the at least one rack member 23 is selectively installed into the channel 211 from one of the openings;

the gear member 22 is positioned and penetrated in the housing 21 in the left-right direction and only rotates relative to the housing 21 through limitation; the gear member 22 comprises a gear body 221 and a rotation acting part 222, wherein the gear body 221 is provided with a gear acting surface 2210 in the circumferential direction, one end of the gear body 221 facing the outer side of the cabinet door is provided with a gear connecting part 2211, and the gear connecting part 2211 is selectively matched and connected with the rotation end of the handle 11; a spiral groove 2220 is formed in the circumferential direction of the rotation acting portion 222, and a first end 2221 of the spiral groove 2220 is arranged close to the gear body 221, and a second end 2222 thereof is arranged far away from the gear body 221; specifically, a slot 2223 is formed in an end, facing the inside of the cabinet door, of the rotation acting portion 222 of the gear member 22, and the rotation acting portion 222 is fixed to the slot 2223 by the split washer 28 after extending out of an end of the housing 21, so as to form a positioning connection between the gear member 22 and the housing 21, and limit displacement of the gear member 22 in the left-right direction. Preferably, the gear connecting portion 2211 is a square groove, the square groove can be in running fit with the handle 11, a rotating shaft is installed in the square groove, the rotating shaft is rotatably connected with the handle 11, the rotating shaft is driven to rotate when the handle 11 rotates, and the rotating shaft drives the gear connecting portion 2211 to rotate for a certain angle, so as to complete unlocking and locking actions. However, the present invention is not limited thereto, and the gear connecting portion 2211 may be a groove with other shapes, such as a prismatic, oval or special-shaped groove, which can complete a rotational fit, or the gear connecting portion 2211 may also be a protruded column structure, which is directly rotationally connected to the handle 11.

The rack member 23 is inserted from the opening direction of the channel 211 and then meshed with the gear member 22, the rack member 23 comprises a rack body 231 and a rack connecting part 232, one side of the rack body 231 facing the gear body 221 is provided with a rack acting surface 2310 used for being meshed with the gear acting surface 2210, the rack acting surface 2310 is provided with a first position 2311 and a second position 2312 which are meshed with the gear body 221 in the length direction of the rack body 231, the first position 2311 is the position of the end of the rack member 23 inserted into the channel 211, and the second position 2312 is the far end of the first position 2311; the rack connecting part 232 is connected with the connecting rod 3 in a positioning way;

the lock rod 26 is arranged in the rotation acting part 222 in a left-right direction in a penetrating mode, the elastic piece 24 is sleeved between the lock rod 26 and the rotation acting part 222, and the elastic piece 24 acts between the lock rod 26 and the gear component 22 to enable the lock rod 26 to keep the trend of moving leftwards; the pin 25 vertically penetrates through the lock rod 26, and in the assembled state of the gear member 22 and the lock rod 26, the end part of the pin 25 extends out of the lock rod 26 and then extends into the spiral groove 2220, so that when the gear member 22 rotates, the lock rod 26 is driven to move in the left-right direction and rotate in the circumferential direction through the matching of the pin 25 and the spiral groove 2220;

the left end of the lock rod 26 is provided with a fastening part 261, and the fastening part 261 is fixedly connected with the lock tongue 27 after extending towards the left side of the casing 21.

The bolt body system of an embodiment of the present invention is configured to:

in a locked state, the end parts of the pins 25 in all the bolt body assemblies 2 are positioned at the first end 2221 of the spiral groove 2220, the handle 11 of the crank lock 1 is in an initial locking position, the rack members 23 in the bolt body assemblies 2 on the crank lock 1 are positioned at the second position 2312 meshed with the gear body 221, the bolt body assemblies 2 on the crank lock 1 drive the other linkage rods 3 to retract towards the crank lock 1, the rack members 23 in the other bolt body assemblies 2 are positioned at the first position 2311 or the second position 2312 meshed with the gear body 221 under the driving of the linkage rods 3, and the lock tongue 27 presses the cabinet door;

in the unlocked state, the handle 11 of the crank lock 1 is in the unlocked position, and after the rotation end of the handle 11 drives the gear member 22 to rotate, the rack members 23 in the bolt body assemblies 2 on the crank lock 1 are located at the second position 2312 meshed with the gear body 221, and the rack members 23 in the rest of the bolt body assemblies 2 are located at the second position 2312 or the first position 2311 meshed with the gear body 221 after the linkage link 3 moves back, the spiral groove 2220 forces the pin 25 to move to the second end 2222 of the spiral groove 2220, and the pin 25 drives the lock rod 26 to rotate and displace so as to rotate the lock tongue 27 and disengage from the cabinet door.

More specifically, in the above embodiment, the rack body 231 is provided with the rack stopper surface 23231 in the same direction as the direction in which the rack member 23 is inserted into the passage 211; for the rack limiting surface 23231, a rack abutting surface 21111 opposite to the direction of inserting the rack member 23 into the channel 211 is provided on the housing 21, and the rack limiting surface 23231 abuts against the rack abutting surface 21111 for limiting the stroke of inserting the rack member 23 into the channel 211; therefore, the forming position of the rack member 23 inserting channel 211 is limited, the uniformity of the inserting length of the rack member 23 is ensured, the action height of each same bolt body assembly 2 is uniform during linkage, and the accuracy and the stability of the bolt body system are improved. Preferably, a sliding groove 2323 is disposed on one of the channel 211 and the rack body 231, and a sliding block 2111 is disposed on the other corresponding to the sliding groove 2323, so that a moving path of the rack member 23 in the channel 211 is formed by the cooperation of the sliding groove 2323 and the sliding block 2111, so that the rack member 23 can better slide on one side and engage with the gear member 22 under the driving of the connecting rod 3 in the channel 211, thereby improving the stability of the latch assembly 2 during operation and ensuring that the rack member 23 can slide well along the moving path.

In the embodiment of the present invention, in one of the channels 211, the sliding slots 2323 or the sliders 2111 are arranged in parallel, the number of the sliding slots 2323 or the sliders 2111 is plural, the sliding slots 2323 or the sliders 2111 are arranged according to the position of the corresponding channel 211 on the housing 21, for example, a cavity and a support body are arranged on the housing 21, and when the sliding slots 2323 or the sliders 2111 are located at corresponding positions of the cavity and the support body, parts arranged in the housing 21 corresponding to the channel 211 are effectively utilized, and components on the path of the channel 211 are designed into the sliding slots 2323 or the sliders 2111 for guiding and limiting, so that the design is ingenious, the sliding of the rack member 23 is accurate, and the accuracy and the stability of meshing with the gear member 22 are improved.

In the embodiment of the present invention, the channel 211 has two openings opened at two ends along the length direction of the channel 211, at least one rack member 23 is selectively installed in the channel 211 from at least one of the openings, or the two rack members 23 are respectively inserted from two openings of one channel 211, the inserted rack members 23 do not interfere with each other, the two rack members 23 can be engaged and slid with the gear member 22 at respective opening angles, and the rack members 23 drive the rack members 23 inserted into two different openings of one channel 211 to be engaged and driven, so as to achieve the corresponding driving, locking and unlocking purposes. Two rows of parallel sliding grooves 2323 or sliding blocks 2111 are arranged along the path direction of the channel 211, the corresponding sliding blocks 2111 or sliding grooves 2323 on the rack body 231 are arranged in a row, and two parallel rack members 23 can be oppositely arranged in one channel 211.

In the embodiment of the present invention, more specifically, four channels 211 are disposed in one of the housings 21, the four channels 211 are disposed in parallel after penetrating through the housing 21, and the channels 211 are located on an extension line of a rotation section of the gear body 221; more specifically, one set of two passages 211 penetrates through the long side of the rectangular housing 21, and the other second set of two passages 211 penetrates through the short side of the rectangular housing 21, the first set of passages 211 may be perpendicular to the long side of the housing 21, or the first set of passages 211 may be inclined to the long side of the housing 21, as long as the passages 211 are arranged around the extension line of the rotation tangent plane of the gear body 221, and generally perpendicular is preferred.

In the embodiment of the present invention, two fixing seats 212 for passing through a fastener are disposed inside the housing 21, after the fastener passes through the fixing seats 212, the latch body assembly 2 is fixed on the cabinet door or the crank lock 1, the fixing seats 212 are correspondingly provided with the sliding blocks 2111 or the sliding grooves 2323 corresponding to the sliding grooves 2323 or the sliding blocks 2111 on the channel 211, and the fixing seats 212 are located on a moving path of the channel 211 therein, so as to make the overall structure of the latch body assembly 2 more compact, reduce the overall volume of the latch body assembly 2, reduce and simplify the structure, and at the same time, still have expanded functions, for example, the fixing seats 212 have functions for fixing with other components, and also have functions for improving the stability of the latch body assembly 2 during operation as a limiting function of the rack member 23 in the sliding way.

In the embodiment of the invention, the bolt body system further comprises a joint 4, one end of the joint 4 is connected with the connecting rod 3 in a positioning way, and the other end of the joint 4 is connected with the rack connecting part 232 in a positioning way; the link 3 has a cylindrical rod body, and the rack connecting portion 232 of the rack member 23 is square; the joint 4 is provided with a first space 41 for inserting a rod body and a second space 42 for inserting the rack connecting part 232, the first space 41 is provided with a deformable semicircular groove body 411, the joint of the first space 41 and the second space 42 is provided with a stop block 43, one side of the stop block 43 is connected with the joint 4, the other side of the stop block 43 is disconnected with the joint 4, the second space 42 faces one side of the rack member 23 to form an opening, and the inner walls of the two sides of the opening are provided with fastening holes 421; in the assembled state of the joint 4 with the link 3 and the rack connecting portion 232, the link 3 and the rack connecting portion 232 are inserted into the first space 41 and the second space 42 of the joint 4; a screw 44 penetrates through the fastening hole 421 and the rack connecting part 232 to form the fixed connection of the rack member 23 and the joint 4, and the semicircular groove body 411 is deformed to enable the stop block 43 to be close to the connecting rod 3; the connecting rod 3 is abutted against the semicircular groove 411 and the stop 43 to form a fixed connection between the connecting rod 3 and the joint 4. The joint 4 of this kind of structure that sets up can get better connecting rod 3 and rack component 23, makes it fix more firm, can satisfy the connection under the different compound mode of a plurality of bolt body subassemblies 2 moreover, makes bolt body subassembly 2 more general in various occasions, realizes the modularization equipment.

In the embodiment of the present invention, since one bolt body assembly 2 has a plurality of channels 211, but the rack member 23 for connecting with the connecting rod 3 does not extend all the channels 211, the auxiliary rack 29 can be inserted into the channel 211 which is not inserted into the rack member 23, and the auxiliary rack 29 is different from the rack member 23 in that the auxiliary rack 29 does not have the rack connecting portion 232 in the rack member 23, and when the rack member 23 drives the gear member 22 to rotate, the auxiliary rack 29 is attached to the other side and is simultaneously engaged with the gear member 22 for transmission, so that the accuracy and reliability of the operation of the bolt body assembly 2 can be further improved.

In the above embodiment, the latch body assembly 2 at least includes the "start position" and the "end position" according to the position, and at least one "relay position" can be set as required, and the "relay position" can not only realize the extension in the linear direction, but also realize the connection in the corner. Wherein the bolt body assembly 2 of the "initial position" refers to the bolt body assembly 2 on the crank lock 1; the bolt body assembly 2 at the "end position" refers to the bolt body assembly 2 to which the last link 3 at the end position of the bolt body system is connected; the latch body assembly 2 in the "relay position" refers to the latch body assembly 2 located between the connection in the "start position" and the "end position"; through the special design of bolt body subassembly 2, can arrange in a flexible way according to the whole functional requirement of tool to lock, and then outstanding application level 'modularization' effect, have stronger commonality and functional.

To better understand this solution, the following description will be made of the initial closed state, initial open state, and unlocking and locking processes of the multi-point linked locking crank latch system, taking the example of the latch body assembly 2 having two channels 211, into which the rack member 23 can be selectively inserted into the channels 211.

Initial off state:

initial closed state referring to fig. 13 to 16, in the locked state, the ends of the pins 25 in all the bolt body assemblies 2 are located at the first ends 2221 of the spiral grooves 2220, the handles 11 of the crank lock 1 are in the initial locked position, the rack members 23 in the bolt body assemblies 2 on the crank lock 1 are located at the second positions 2312 meshed with the gear body 221, the rack members 23 in the other bolt body assemblies 2 are located at the first positions 2311 or the second positions 2312 meshed with the gear body 221, and the lock tongue 27 presses the cabinet door; the latch body assembly 2 in the "initial position" is shown in fig. 29, which is an enlarged schematic view of the latch body assembly 2 in the initial closed state of the crank lock 1, wherein the two rack members 23 on the latch body assembly 2 are respectively inserted into the channels 211 at the left and right sides from the up-down direction, and after the rack members 23 are inserted to the bottom, the two rack members 23 are both located at the second position 2312 meshed with the gear body 221; the latch body assembly 2 in the "relay position" is shown with reference to fig. 30, and is the latch body assembly 2 in the "relay position" in which the latch body assembly 2 at the crank lock 1 is drivingly connected by the link 3, and two rack members 23 in the latch body assembly 2 are respectively inserted into one passage 211 on the same side from the up-down direction, wherein the proximal rack member 23 linked with the link 3 of the latch body assembly 2 at the "start position" is located at a first position 2311 engaged with the gear body 221, and the other distal rack member 23 is located at a second position 2312 engaged with the gear body 221; bolt assembly 2 in the "end position" as shown with reference to figure 31, the bolt assembly 2 is simply passed through one rack member 23, the rack member 23 is connected to the link 3 at the distal end of the bolt assembly 2 in the "relay position", and the rack member 23 is in a first position 2311 in which it engages the gear body 221.

An unlocking process:

the unlocking process can be seen with reference to fig. 17 to 19, with the following steps:

1. as shown in fig. 17, the key is rotated 180 ° counterclockwise, unlocking the crank lock 1;

2. as shown in fig. 18, the handle 11 of the crank lock 1 is lifted;

3. rotating handle 11 of crank lock 1 counterclockwise, when rotating the first 60 °, handle 11 drives gear member 22 in bolt body assembly 2 of crank lock 1 to rotate, driving pin 25 to rotate along spiral groove 2220, and the end of pin 25 moves from first end 2221 to second end 2222 of spiral groove 2220; the gear member 22 rotates and drives the rack member 23 to engage for transmission, in the latch body assembly 2 on the crank lock 1, the rack member 23 moves from the first position 2311 engaged with the gear body 221 to the second position 2312, that is, the gear member 22 is driven to extend upwards and downwards, and the gear member 22 drives the connecting rod 3 and the latch body assembly 2 at each of the relay position and the tail end position connected to the rear surface to perform linkage; the bolt 27 of the tightening lock mechanism of each bolt body assembly 2 is gradually bounced, and the pressure of the bolt 27 on the cabinet door is relieved; and then continuing to rotate anticlockwise, driving the bolt 27 to rotate together until the bolt 27 is completely separated from the cabinet door, and completely unlocking.

And after the bolt body system is unlocked, the initial open state is entered.

Initial open state:

referring to fig. 20 to 23, in the initial open state, the handle 11 of the crank lock 1 is in the unlocked position, the gear member 22 is rotated by the rotating end of the handle 11, so that the rack member 23 in the bolt body assembly 2 of the crank lock 1 is located at the first position 2311 engaged with the gear body 221, the rack member 23 in the rest of the bolt body assemblies 2 is located at the second position 2312 or the first position 2311 engaged with the gear body 221 after the linkage link 3 is moved back and forth, the spiral groove 2220 forces the pin 25 to move to the second end 2222 of the spiral groove 2220, and the pin 25 drives the lock rod 26 to rotate and displace to rotate the lock tongue 27 and disengage from the cabinet door. In the initial open state, the two rack members 23 on the latch body assembly 2 located at the "home position" are located at the first position 2311 engaged with the gear body 221; in the latch body assembly 2 in the "relay position", the proximal rack member 23, which is interlocked with the link 3 of the latch body assembly 2 in the "start position", is located at the second position 2312 engaged with the gear body 221, and the other distal rack member 23 is located at the first position 2311 engaged with the gear body 221; the rack member 23 in the "end position" latch body assembly 2 is in a second position 2312 engaging the gear body 221

And (3) locking process:

the locking process can be seen with reference to fig. 24 to 28, with the following steps:

1. as shown in fig. 18, when the handle 11 of the crank lock 1 is rotated clockwise, the locking tongues 27 of the respective bolt bodies are rotated together to the inner side of the door frame when rotated by the first 60 °; continuing to rotate clockwise, the tightening lock mechanism of the bolt body assembly 2 drives the bolt 27 to press the door frame;

2. when the handle 11 is rotated to the same direction as the crank lock 1 body, the handle 11 is pressed;

3. the key is rotated 180 deg. clockwise to lock the crank lock 1.

After the locking of the crank lock 1 is completed, the initial closed state shown in fig. 13 to 16 is entered again.

In the embodiment of the present invention, the latch body assemblies 2 are selectively arranged in parallel or perpendicular to the length extension direction of the connecting rod 3, the direction of the channel 211 in the previous latch body assembly 2 and the next latch body assembly 2 is parallel or perpendicular between the two connected latch body assemblies 2, and the rack member 23 is inserted into the parallel or perpendicular channel 211 so that the moving direction of the rack member 23 is parallel or perpendicular. The arrangement of the bolt body assembly 2 can be a linear type multipoint linkage bolt body system which is parallel to the length extension direction of the connecting rod 3, and the bolt body drives the connecting rod 3 to advance and retreat along the same parallel direction; the bolt body assembly 2 can also be arranged into a 90-degree-angle multi-point linkage bolt body system which is vertical to the length extending direction of one of the connecting rods 3, at this time, a pair of adjacent bolt body assemblies 2 are vertically arranged, the connecting rod 3 connected with the previous bolt body assembly 2 is vertical to the connecting rod 3 connected with the next bolt body assembly 2, and when the connecting rod 3 of the previous bolt body assembly 2 drives the rack member 23 to transmit along the direction a, the rack member 23 in the next bolt body assembly 2 is driven to transmit along the direction perpendicular to the direction a.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The multi-point linkage locking crank bolt system is used for multi-point linkage locking of a cabinet door, defines that the inner side of the cabinet door is the left side, and the outer side of the cabinet door is the right side, and is characterized in that:

the bolt body system comprises a crank lock (1), at least one connecting rod (3) and a plurality of bolt body assemblies (2);

the crank lock (1) comprises a handle (11), a locking mechanism (13) and a body base (12); the upper end of the handle (11) is a rotating end and is rotatably connected to the upper end of the body base (12), and the lower end of the handle (11) is a locking end; the locking mechanism (13) is arranged at the lower end of the body base (12) and is matched with the locking end of the handle (11) to lock and unlock the handle (11); one of the bolt body assemblies (2) is arranged in the body base (12) and is matched with the rotating end of the handle (11) to lock and unlock a bolt body system;

the connecting rod (3) is connected with the bolt body assemblies (2) and the crank lock (1), and the connecting rod (3) is driven by the crank lock (1) to advance and retreat along the length direction of the connecting rod (3) so as to drive each bolt body assembly (2) to act; after the bolt body assembly (2) on the crank lock (1) is connected with the connecting rod (3), at least one bolt body assembly (2) is additionally connected in the length extending direction of the connecting rod (3);

each bolt body assembly (2) comprises a shell (21), a gear component (22), a rack component (23), an elastic piece (24), a pin (25), a lock rod (26) and a bolt (27); wherein the content of the first and second substances,

the housing (21) is provided with at least one channel (211) for the rack member (23) to pass through, the channel (211) is provided with at least one opening, and the at least one rack member (23) is selectively installed into the channel (211) from one opening;

the gear component (22) is positioned and arranged in the shell (21) in the left-right direction and only rotates relative to the shell (21) through limitation; the gear member (22) comprises a gear body (221) and a rotation acting part (222), a gear acting surface (2210) is arranged on the circumferential direction of the gear body (221), a gear connecting part (2211) is arranged at one end, facing the outer side of the cabinet door, of the gear body (221), and the gear connecting part (2211) is selectively matched and connected with the rotation end of the handle (11); a spiral groove (2220) is formed in the circumferential direction of the rotating action part (222), a first end (2221) of the spiral groove (2220) is arranged close to the gear body (221), and a second end (2222) is arranged far away from the gear body (221);

the rack member (23) is inserted from the opening direction of the channel (211) and then meshed with the gear member (22), the rack member (23) comprises a rack body (231) and a rack connecting part (232), one side of the rack body (231) facing the gear body (221) is provided with a rack acting surface (2310) used for being meshed with the gear acting surface (2210), and the rack acting surface (2310) is provided with a first position (2311) and a second position (2312) which are meshed with the gear body (221) in the length direction of the rack body (231); the rack connecting part (232) is connected with the connecting rod (3) in a positioning way;

the lock rod (26) is arranged in the rotation action part (222) in a left-right direction in a penetrating mode, an elastic piece (24) is sleeved between the lock rod (26) and the rotation action part (222), and the elastic piece (24) acts between the lock rod (26) and the gear component (22) to enable the lock rod (26) to keep the trend of leftward displacement; the pin (25) vertically penetrates through the lock rod (26), and in the assembly state of the gear member (22) and the lock rod (26), the end part of the pin (25) extends out of the outer side of the lock rod (26) and then extends into the spiral groove (2220), so that when the gear member (22) rotates, the lock rod (26) is driven to move in the left-right direction and rotate in the circumferential direction through the matching of the pin (25) and the spiral groove (2220);

the left end of the lock rod (26) is provided with a fastening part (261), and the fastening part (261) extends towards the left side of the shell (21) and then is fixedly connected with the lock tongue (27);

the bolt body system is configured to:

in a locked state, the ends of the pins (25) in all the bolt body assemblies are positioned at the first end (2221) of the spiral groove (2220), the handle (11) of the crank lock (1) is in an initial locking position, the rack member (23) in the bolt body assembly (2) on the crank lock (1) is positioned at the second position (2312) meshed with the gear body (221), the rack member (23) in the other bolt body assemblies (2) is positioned at the first position (2311) or the second position (2312) meshed with the gear body (221), and the lock tongue (27) presses the cabinet door;

in an unlocking state, the handle (11) of the crank lock (1) is in an unlocking position, after the rotation end of the handle (11) drives the gear member to rotate, the rack members (23) in the bolt body assemblies (2) on the crank lock (1) are positioned on the first position (2311) meshed with the gear body (221), the rack members (23) in the other bolt body assemblies (2) are positioned on the second position (2312) or the first position (2311) meshed with the gear body (221) after the linkage connecting rod (3) advances and retreats, the pin (25) is forced by the spiral groove (2220) to move to the second end (2222) of the spiral groove (2220), and the pin (25) drives the lock rod (26) to rotate and displace so that the lock tongue (27) rotates and is separated from the cabinet door.

2. The multi-point linkage locking handle latch system of claim 1, wherein: a rack limiting surface (23231) which is in the same direction as the insertion channel (211) of the rack member (23) is arranged on the rack body (231); for the rack limiting surface (23231), a rack abutting surface (21111) which is opposite to the direction of the insertion channel (211) of the rack member (23) is arranged on the shell (21), and the rack limiting surface (23231) abuts against the rack abutting surface (21111) so as to limit the stroke of the insertion channel (211) of the rack member (23).

3. The multi-point linkage locking handle latch system of claim 1, wherein: between the two of the channel (211) and the rack body (231), one of the two is provided with a sliding chute (2323), the other one is provided with a sliding block (2111) corresponding to the sliding chute (2323), and the sliding chute (2323) is matched with the sliding block (2111) to form a moving path of the rack member (23) in the channel (211).

4. The multi-point linkage locking handle latch system of claim 3, wherein: two fixing seats (212) used for penetrating through fasteners are arranged in the shell (21), the fixing seats (212) are fixed on the cabinet door after penetrating through the fasteners, and sliders (2111) or sliding grooves (2323) corresponding to the sliding grooves (2323) or the sliders (2111) are correspondingly arranged on the fixing seats (212).

5. The multi-point linkage locking handle latch system of claim 3, wherein: in one channel (211), the sliding grooves (2323) or the sliding blocks (2111) are arranged in parallel, and the number of the sliding grooves (2323) or the sliding blocks (2111) is multiple.

6. The multi-point linkage locking handle latch system of claim 1, wherein: the channel (211) has two openings, at least one rack member (23) being selectively installed into the channel (211) from at least one of the openings.

7. The multi-point linkage locking handle latch system of claim 5, wherein: two rows of parallel sliding grooves (2323) or sliding blocks (2111) are arranged along the path direction of the channel (211), the corresponding sliding blocks (2111) or sliding grooves (2323) on the rack body (231) are arranged in a row, and two parallel rack components (23) can oppositely penetrate through one channel (211).

8. The multi-point linkage locking handle latch system of claim 1, wherein: the gear is characterized in that four channels (211) are arranged in one shell (21), the four channels (211) penetrate through the shell (21) and are arranged in parallel, and the channels (211) are located on the extension line of the rotating tangent plane of the gear body (221).

9. The multi-point linkage locking handle latch system of claim 1, wherein: the bolt body assembly (2) is selectively arranged to be parallel or perpendicular to the length extension direction of the connecting rod (3).

10. The multi-point linkage locking handle latch system of claim 1, wherein: the bolt body system further comprises a joint (4), one end of the joint (4) is connected with the connecting rod (3) in a positioning mode, and the other end of the joint (4) is connected with the rack connecting part (232) in a positioning mode; the connecting rod (3) is provided with a cylindrical rod body, a rack connecting part (232) of the rack component (23) is in a square shape, and a hole is formed in the rack connecting part (232); the joint (4) is provided with a first space (41) for inserting the rod body and a second space (42) for inserting the rack connecting part (232), the first space (41) is internally provided with a deformable semicircular groove body (411), a stop block (43) is arranged at the joint of the first space (41) and the second space (42), one side of the stop block (43) is connected with the joint (4), the other side of the stop block is disconnected with the joint (4), the second space (42) faces one side of the rack member (23) to form an opening, and the inner walls of the two sides of the opening are provided with fastening holes (421); the connecting rod (3) and the rack connecting part (232) are inserted into the first space (41) and the second space (42) of the joint (4) in the assembling state of the joint (4) with the connecting rod (3) and the rack connecting part (232); a screw (44) penetrates through the fastening hole (421) and the rack connecting part (232) to form fixed connection between the rack member (23) and the joint (4), and the semicircular groove body (411) is deformed to enable the stop block (43) to be close to the connecting rod (3); the connecting rod (3) is abutted against the semicircular groove body (411) and the stop block (43) to form fixed connection of the connecting rod (3) and the joint (4).