Lock catch

Abstract

The utility model discloses a lock catch which comprises a seat body, two ends of the seat body are respectively provided with a shaft hole, a rotatable square shaft is arranged in each shaft hole in a penetrating mode, one end of each square shaft is connected with a locking block, the other end of each square shaft is connected with an operation handle, two oppositely-arranged protruding blocks are arranged on the inner walls of the shaft holes, and the protruding blocks are matched with the circumferential faces of the square shafts. When the square shaft is driven by the operating handle to rotate by 90 degrees clockwise or anticlockwise, a pair of parallel surfaces of the square section of the square shaft can abut against the limiting surfaces of the two protruding blocks, stable surface contact is formed, and therefore accurate limiting is achieved. The double locking blocks can effectively prevent the square shaft from accidentally rotating in a non-operation state, and the locking state is more stable and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to connecting device technical field especially relates to a lock catch. BACKGROUND

[0002] The lock catch is mainly applied to the scenes such as amusement facilities, safety protection net, indoor and outdoor decoration and exhibition building, and is used for the lock catch of fast connecting section bar and tensioning rope, chain or grid.

[0003] In the prior art, such lock catch usually includes a seat body installed on section bar or base plate, and an operating shaft rotatably arranged in the seat body. One end of the operating shaft cooperates with external operating tool (such as handle), and the other end is connected with a lock block rotatable with it. By rotating the operating shaft, the lock block is driven to rotate a certain angle relative to the seat body, so that it is clamped into the slot of section bar or forms limiting with the installation base plate, thereby realizing the fixation of the lock catch. The adjacent lock catches can be connected with rope, steel wire or elastic net to constitute a complete fence, safety net or decorative surface.

[0004] However, the existing lock catch structure has defects: only one operating shaft is arranged on the seat body, in order to ensure that the lock block can reach the locking position after small-angle rotation (usually 30°-60°), the lock block must be designed to be long. This design relies on the two end parts of the lock block to be limited in the inner wall of the section bar or base after rotation, thereby realizing locking. The central part of the long lock block connected with the operating shaft bears huge torque and shearing force when being stressed, which is the weak link of the whole structure, and there is a risk of fracture. The single lock block design scheme is easy to cause the whole lock catch to fail. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at overcoming the defects and deficiencies in the prior art and provides a lock catch.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a lock catch, including seat body, the seat body is equipped with the connecting portion for connecting external component, the both ends of seat body are equipped with the shaft hole respectively, a square shaft is rotatably arranged in each shaft hole, the both ends of square shaft are connected with lock block and operating handle respectively, the inner wall of shaft hole is equipped with two opposite setting protrusions, when the square shaft rotates 90° clockwise or counterclockwise, the two opposite wide surfaces on the square shaft respectively abut with two protrusions to realize rotation limiting.

[0007] As a preferred technical scheme of the utility model, two protrusions are symmetrically arranged in the shaft hole and separate the shaft hole into two symmetric fan-shaped spaces; each protrusion forms two mutually perpendicular limiting surfaces, and when the square shaft rotates 90° clockwise or counterclockwise, the two opposite wide surfaces can respectively form surface contact with the limiting surfaces of two protrusions.

[0008] As a preferred technical scheme of the utility model, one end of the operating handle facing the seat body is provided with a plug-in groove matched with the shape of the square shaft end, the operating handle is plugged with the square shaft through the plug-in groove and is fixedly connected through a fastener.

[0009] As a preferred technical scheme of the utility model, one end of the square shaft is provided with a plug, a limiting groove is arranged in the lock block, the square shaft is arranged in the lock block and the plug abuts against the groove wall of the limiting groove and is fixedly connected through a fastener.

[0010] As a preferred technical scheme of the utility model, a spring mounting hole is formed in the side of the operating handle facing the seat body, a compression spring and a positioning bead are arranged in the spring mounting hole, the positioning bead partially protrudes from the opening of the spring mounting hole, an arc-shaped positioning ring groove is arranged on the end face of the seat body opposite to the operating handle, two positioning recesses are formed in the groove bottom of the arc-shaped positioning ring groove at intervals of 90° in the circumferential direction, and the positioning bead is clamped into the corresponding positioning recess under the elastic force of the spring when the operating handle is rotated to the limiting position clockwise or counterclockwise.

[0011] As a preferred technical scheme of the utility model, the connecting part is a connecting piece arranged in the middle part of the seat body, and a connecting hole is formed in the connecting piece.

[0012] As a preferred technical scheme of the utility model, the connecting piece comprises a rod part and a limiting part arranged at one end of the rod part, and the connecting hole is arranged on the rod part, a through hole through which the rod part passes and an installation cavity communicated with the through hole are formed in the seat body, the limiting part is accommodated in the installation cavity and is fixedly connected with the seat body through a fastener.

[0013] In conclusion, the utility model has the advantages that the double lock block mechanisms symmetrically arranged at the two ends of the seat body, one lock block is driven by a square shaft, the locking of the double lock buckles is realized, the symmetrical stress structure makes the locking force more uniform, the problems of eccentric load and shaking possibly caused by single-point locking are effectively avoided, and the rigidity and stability of the lock buckle are improved. Through the unique cooperation of the square shaft and the protruding block in the shaft hole, the accurate 90° rotation limiting is realized. When operating, the operating handle only needs to be rotated by 90°, and the plane of the square shaft forms a large-area surface contact with the limiting surface of the protruding block. The angle of this limiting mode is accurate, the stopping is crisp, the locking or unlocking state can be quickly confirmed without multiple attempts or observation, and the operation is very convenient. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a structure schematic view in the unlocking state of the utility model;

[0015] Fig. 2It is the structure schematic diagram of the locking state of the utility model;

[0016] Fig. 3 It is the structure schematic diagram of the utility model in the lock seat;

[0017] Fig. 4 It is the structure schematic diagram of the utility model in the lock seat, lock block, square shaft cooperation;

[0018] Fig. 5 It is the structure schematic diagram of the utility model in the square shaft, lock block;

[0019] Fig. 6 It is the structure schematic diagram of the utility model in the operation handle.

[0020] Reference signs: 1, seat body;2, connecting piece;3, shaft hole;4, square shaft;5, lock block;6, operation handle;7, protruding block;8, limiting surface;9, plug-in slot;10, plug;11, limiting slot;12, spring mounting hole;13, positioning bead;14, arc-shaped positioning ring groove;15, positioning pit;16, connecting hole;17, rod part;18, limiting part;19, through hole;20, installation cavity;21, fan-shaped space;22, wide surface. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the following further describes the utility model in combination with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the utility model, and are not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor all belong to the protection scope of the utility model.

[0022] The specific embodiments of the utility model are described below in combination with the drawings.

[0023] As Figs. 1 to 6 shown, a lock catch includes a seat body 1, the seat body 1 is equipped with the connecting part for connecting external component, the seat body 1 both ends are equipped with shaft hole 3 respectively, every shaft hole 3 can rotatably be equipped with a square shaft 4 in, the both ends of square shaft 4 are connected with lock block 5 and operation handle 6 respectively, the inner wall of shaft hole 3 is equipped with two oppositely arranged protruding blocks 7, when square shaft 4 rotates 90 ° clockwise or counterclockwise, the two wide surfaces 22 on square shaft 4 respectively with two protruding blocks 7 abut to realize rotation limiting. Two protruding blocks 7 are symmetrically arranged in shaft hole 3, and shaft hole 3 is divided into two symmetrical fan-shaped spaces 21;Every protruding block 7 is formed with two mutually perpendicular limiting surfaces 8, when square shaft 4 rotates 90 ° clockwise or counterclockwise, two opposite wide surfaces 22 can respectively form surface contact with the limiting surface 8 of two protruding blocks 7.

[0024] The double locking block 5 mechanism symmetrically arranged at both ends of the seat body 1 drives one locking block 5 through a square shaft 4, realizes the locking of the double locking buckle, and the symmetrical stress structure makes the locking force more uniform, effectively avoids the problems of unbalanced load and shaking that may be caused by single-point locking, and improves the rigidity and stability of the locking buckle. Through the unique cooperation of the square shaft 4 and the protrusion 7 in the shaft hole 3, precise 90° rotation limiting is realized. When operating, only the operation handle 6 needs to be rotated by 90°, and the plane of the square shaft 4 forms a large-area surface contact with the limiting surface 8 of the protrusion 7. This limiting method is accurate in angle and crisp in stopping, and the locking or unlocking state can be quickly confirmed without multiple attempts or observation, and the operation is very convenient.

[0025] One end of the operation handle 6 facing the seat body 1 is provided with a plug-in groove 9 matched with the shape of the end of the square shaft 4, the operation handle 6 is plugged with the square shaft 4 through the plug-in groove 9, and is fixedly connected through a fastener (screw). When assembling, the end of the square shaft 4 is inserted into the plug-in groove 9 to preliminarily position the operation handle 6 and the square shaft 4 in the circumferential direction to prevent relative rotation; then, a fastening screw is inserted and tightened to finally fixedly connect the operation handle 6 and the square shaft 4. This connection mode combining plug-in and screw fastening is not only convenient to assemble, but also ensures the reliability of the transmission of operation torque. It can be understood that the fastening mode is not limited to a screw, and other equivalent fastening modes known to those skilled in the art such as a pin shaft and riveting can also be used, as long as reliable fixation of the operation handle 6 and the square shaft 4 can be achieved.

[0026] One end of the square shaft 4 is provided with a plug 10, the locking block 5 is provided with a limiting groove 11, the square shaft 4 is inserted into the locking block 5, and the plug 10 abuts against the groove wall of the limiting groove 11. After the other end of the square shaft 4 is plugged with the operation handle 6 and connected through a fastener, the square shaft 4, the locking block 5 and the operation handle 6 are installed on the seat body 1.

[0027] The operation handle 6 facing the seat body 1 is provided with a spring mounting hole 12, a compression spring and a positioning bead 13 are arranged in the spring mounting hole 12, and the positioning bead 13 partially protrudes from the opening of the spring mounting hole 12; an arc-shaped positioning ring groove 14 is arranged on the end face of the seat body 1 opposite to the operation handle 6, and two positioning recesses 15 are arranged at intervals of 90° along the circumferential direction at the groove bottom of the arc-shaped positioning ring groove 14; after the operation handle 6 is rotated clockwise or counterclockwise to the limiting position (i.e., a pair of parallel planes of the square shaft 4 abut against two protrusions 7 respectively), the positioning bead 13 is clamped into the corresponding positioning recess 15 under the elastic force of the spring.

[0028] The connecting part is a connecting piece 2 arranged in the middle of the seat body 1, and a connecting hole 16 is arranged on the connecting piece 2. The connecting piece 2 comprises a rod part 17 and a limiting part 18 arranged at one end of the rod part 17, and the connecting hole 16 is arranged on the rod part 17; a through hole 19 through which the rod part 17 passes and a mounting cavity 20 communicated with the through hole 19 are arranged on the seat body 1, the limiting part 18 is accommodated in the mounting cavity 20 and is fixedly connected with the seat body 1 through a fastener. In the embodiment, the connecting hole 16 of the connecting part can be directly used for penetrating or hanging a flexible or chain member such as a rope, a woven tape, a chain or a metal mesh, and when in operation, the rope or the mesh is penetrated through the connecting hole 16 and is fixed.

[0029] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A latch, comprising a base (1), wherein the base (1) is provided with a connecting portion for connecting an external component, characterized in that: The base (1) has shaft holes (3) at both ends. A square shaft (4) is rotatably inserted in each shaft hole (3). A locking block (5) and an operating handle (6) are connected to both ends of the square shaft (4). Two opposing protrusions (7) are provided on the inner wall of the shaft hole (3). When the square shaft rotates 90° clockwise or counterclockwise, the two opposite wide surfaces on the square shaft abut against the two protrusions to achieve rotational limitation.

2. The latch according to claim 1, characterized in that: Two protrusions (7) are symmetrically arranged in the shaft hole (3) and divide the shaft hole (3) into two symmetrical fan-shaped spaces (21); each of the protrusions (7) has two mutually perpendicular limiting surfaces (8). When the square shaft (4) rotates 90° clockwise or counterclockwise, its two opposite wide surfaces (22) can respectively form surface contact with the limiting surfaces (8) of the two protrusions (7).

3. The latch according to claim 1, characterized in that: The operating handle (6) has a insertion groove (9) at one end facing the base (1) that is adapted to the shape of the end of the square shaft (4). The operating handle (6) is inserted into the square shaft (4) through the insertion groove (9) and fixedly connected by fasteners.

4. The latch according to claim 1 or 3, characterized in that: One end of the square shaft (4) is provided with a plug (10), and the locking block (5) is provided with a limiting groove (11). The square shaft (4) passes through the locking block (5) and the plug (10) abuts against the groove wall of the limiting groove (11) and is fixedly connected by fasteners.

5. The latch according to claim 1 or 3, characterized in that: The operating handle (6) has a spring mounting hole (12) on the side facing the base (1). A compression spring and a positioning bead (13) are provided in the spring mounting hole (12). The positioning bead (13) protrudes from the opening of the spring mounting hole (12). An arc-shaped positioning ring groove (14) is provided on the end face of the base (1) opposite to the operating handle (6). Two positioning recesses (15) are opened at 90° intervals along the bottom of the arc-shaped positioning ring groove (14). When the operating handle (6) is rotated clockwise or counterclockwise to the limit position, the positioning bead (13) is inserted into the corresponding positioning recess (15) under the elastic force of the spring.

6. The latch according to claim 1, characterized in that: The connecting part is a connector (2) located in the middle of the base (1), and the connector (2) has a connecting hole (16).

7. The latch according to claim 6, characterized in that: The connector (2) includes a rod (17) and a limiting part (18) located at one end of the rod (17). The connecting hole (16) is provided on the rod (17). The base (1) is provided with a through hole (19) through which the rod (17) passes and a mounting cavity (20) communicating with the through hole (19). The limiting part (18) is housed in the mounting cavity (20) and is fixedly connected to the base (1) by fasteners.

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