Backrest lock with improved stay wire structure

Abstract

A backrest lock with an improved stay wire structure comprises a backrest lock body, the backrest lock body comprises a bottom plate, a stop hook is hinged to the bottom plate, a rivet is riveted to the upper end of the stop hook, a cylindrical block is coaxially connected to the upper end of the rivet, a long circular block is connected to the upper end of the cylindrical block, a connector is arranged on the cylindrical block in a sleeved mode, and the connector is connected with a stay wire. A long round hole matched with the long round block is formed in the connector, the long diameter of the long round hole is larger than or equal to the long diameter of the long round block, the short diameter of the long round hole is larger than or equal to the short diameter of the long round block, and the short diameter of the long round hole is smaller than the long diameter of the long round block. The stay wire is connected with the stop hook through the connector and the rivet, and when the oblong hole of the connector and the oblong block are staggered, namely the long diameter of the oblong hole is not parallel to the long diameter of the oblong block, the oblong block can firmly clamp the connector, so that the stay wire is assembled in place. And when the long diameter of the long circular hole is parallel to the long diameter of the long circular block, the joint can be detached and replaced.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a device for adjusting the angle of a car seat backrest, in particular to a backrest lock with an improved pull-wire structure. Background Art

[0002] The car seat back lock is used to lock the backrest after adjusting the angle. In the prior art, the seat back lock includes a base plate, a stop hook is arranged on the base plate, a pull wire is connected to the stop hook, and the pull wire and the stop hook can be connected by a plastic sleeve or by riveting a joint with a rivet. However, for the plastic sleeve, when the pull wire has a large load-bearing capacity, the plastic sleeve is easy to break, and the pull wire is separated from the stop hook, resulting in functional failure; for the rivet riveting method, the pull wire cannot be disassembled and replaced. Summary of the invention

[0003] The utility model aims to provide a backrest lock with an improved cable structure, which solves the technical problems in the prior art that the cable structure has a small bearing capacity and cannot be disassembled and replaced.

[0004] The utility model discloses a backrest lock with an improved pull-wire structure, comprising a backrest lock body, the backrest lock body comprising a bottom plate, a notch opening downwardly is arranged on the bottom plate, a ratchet shaft is arranged on the bottom plate, a pawl is hingedly connected to the bottom plate through the ratchet shaft, a torsion spring is arranged between the ratchet shaft and the pawl, the torsion spring biases the pawl in a counterclockwise direction, a bayonet opening to the right and a stop groove are arranged on the pawl, the stop groove is located above the bayonet, a stop hook is hingedly connected to the right of the pawl through a fixed column on the bottom plate, a stop block matching the stop groove is arranged on the left side of the stop hook, and the upper end of the stop hook Rivets are riveted, and the upper end of the rivet is coaxially connected to a cylindrical block, and the upper end of the cylindrical block is coaxially connected to an oblong block. A joint is sleeved on the cylindrical block, and a pull wire is connected to the joint. An oblong hole matching the oblong block is provided in the joint, the long diameter of the oblong hole is greater than or equal to the long diameter of the oblong block, the short diameter of the oblong hole is greater than or equal to the short diameter of the oblong block, the short diameter of the oblong hole is smaller than the long diameter of the oblong block, the thickness of the joint is less than or equal to the axial length of the cylindrical block, a tension spring is connected between the rivet and the upper end of the pawl, and a limiting column is provided on the left side of the pawl on the bottom plate.

[0005] Furthermore, the pull wire is a steel wire rope.

[0006] Compared with the prior art, the utility model has a positive and obvious effect. The pull wire of the utility model is connected with the stop hook through the joint, the rivet, and when the oblong hole of the joint is misaligned with the oblong block, that is, when the long diameter of the oblong hole is not parallel to the long diameter of the oblong block, the oblong block can firmly clamp the joint so that the pull wire is assembled in place. When the joint is rotated so that the long diameter of the oblong hole is parallel to the long diameter of the oblong block, the joint can be disassembled and replaced, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The utility model is a schematic diagram of a backrest lock with an improved pull-wire structure.

[0008] Figure 2 The utility model is a three-dimensional schematic diagram of a pull wire structure in a backrest lock with an improved pull wire structure.

[0009] Figure 3 The utility model is a cross-sectional schematic diagram of a pull wire structure in a backrest lock with an improved pull wire structure. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with an embodiment, but the present invention is not limited to the embodiment. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of clear description and is not a limitation on the technical solution of the present invention.

[0011] like Figure 1-Figure 3 As shown, a backrest lock with an improved pull-wire structure of the utility model comprises a backrest lock body, wherein the backrest lock body comprises a bottom plate 1, a notch 2 opening downward is provided on the bottom plate 1, a ratchet shaft 12 is provided on the bottom plate 1, a pawl 4 is hingedly connected to the bottom plate 1 through the ratchet shaft 12, a torsion spring is provided between the ratchet shaft 12 and the pawl 4, the torsion spring biases the pawl 4 in a counterclockwise direction, a bayonet 5 opening to the right and a stop groove 6 are provided on the pawl 4, the stop groove 6 is located above the bayonet 5, a stop hook 7 is hingedly connected to the right of the pawl 4 on the bottom plate 1 through a fixing column 13, a stop block 8 cooperating with the stop groove 6 is provided on the left side of the stop hook 7, a rivet 15 is riveted to the upper end of the stop hook 7, The upper end of the rivet 15 is coaxially connected to a cylindrical block 16, and the upper end of the cylindrical block 16 is coaxially connected to an oblong block 17. A joint 18 is sleeved on the cylindrical block 16, and the joint 18 is connected to a pull wire 9. An oblong hole 19 matching the oblong block 17 is provided in the joint 18. The long diameter of the oblong hole 19 is greater than or equal to the long diameter of the oblong block 17, the short diameter of the oblong hole 19 is greater than or equal to the short diameter of the oblong block 17, and the short diameter of the oblong hole 19 is smaller than the long diameter of the oblong block 17. The thickness of the joint 18 is less than or equal to the axial length of the cylindrical block 16. A tension spring 10 is connected between the rivet 15 and the upper end of the pawl 4, and a limiting column 11 is provided on the left side of the pawl 4 on the bottom plate 1.

[0012] Furthermore, the pull wire 9 is a steel wire rope.

[0013] Specifically, the backrest lock body, the pawl 4, the torsion spring, the stop hook 7, the stop block 8, etc. in this embodiment all adopt the well-known solutions in the prior art, which are well understood by those skilled in the art and will not be described in detail here.

[0014] The working principle of this embodiment is as follows: the seat back of the car is connected with a lock buckle 14. In the initial state, the backrest is at a 0° state, and the lock buckle 14 has not yet been inserted into the backrest lock. When the backrest angle needs to be adjusted to 90°, the pull wire 9 is used to pull the stop hook 7 clockwise, and the stop block 8 is disengaged from the stop groove 6. At the same time, the stop hook 7 drives the pawl 4 to rotate clockwise through the tension spring 10 to overcome the elastic force of the torsion spring, so that the pawl 4 is unlocked, and then the backrest is adjusted so that the lock buckle 14 is inserted into the notch 2. Then the pull wire 9 is released, and the pawl 4 rotates counterclockwise back to its original position by relying on the elastic force of the torsion spring, and the stop block 8 is driven by the tension spring 10 to enter the stop groove 6, and the pawl 4 and the lock buckle 14 are locked, so that the backrest angle is fixed. When the backrest angle needs to be adjusted again, the above unlocking action is repeated to unlock the pawl 4, and the lock buckle 14 is disengaged from the notch 2, so that the backrest is restored to the 0° state.

[0015] The pull wire 9 of the utility model is connected to the stop hook 7 through the joint 18 and the rivet 15. When the oblong hole 19 of the joint 18 is misaligned with the oblong block 17, that is, when the long diameter of the oblong hole 19 is not parallel to the long diameter of the oblong block 17, since the short diameter of the oblong hole 19 is smaller than the long diameter of the oblong block 17, the oblong block 17 can firmly clamp the joint 18 in the axial direction, so that the pull wire 9 is assembled in place. When the joint 18 is rotated so that the long diameter of the oblong hole 19 is parallel to the long diameter of the oblong block 17, the joint can be disassembled and replaced, reducing maintenance costs.

Claims

1. A backrest lock with an improved pull-wire structure, characterized in that: The backrest lock body includes a bottom plate, a notch opening downward is provided on the bottom plate, a ratchet shaft is provided on the bottom plate, a ratchet pawl is hinged on the bottom plate through the ratchet shaft, a torsion spring is provided between the ratchet shaft and the ratchet pawl, the torsion spring biases the ratchet pawl in a counterclockwise direction, a bayonet opening to the right and a stop groove are provided on the ratchet pawl, the stop groove is located above the bayonet, a stop hook is hinged on the right side of the ratchet pawl through a fixing column on the bottom plate, a stop block matching the stop groove is provided on the left side of the stop hook, a rivet is riveted on the upper end of the stop hook, and a rivet is provided on the rivet The end is coaxially connected with a cylindrical block, the upper end of the cylindrical block is coaxially connected with an oblong block, a joint is sleeved on the cylindrical block, the joint is connected with a pull wire, an oblong hole matching the oblong block is provided in the joint, the long diameter of the oblong hole is greater than or equal to the long diameter of the oblong block, the short diameter of the oblong hole is greater than or equal to the short diameter of the oblong block, the short diameter of the oblong hole is smaller than the long diameter of the oblong block, the thickness of the joint is less than or equal to the axial length of the cylindrical block, a tension spring is connected between the rivet and the upper end of the pawl, and a limiting column is provided on the left side of the pawl on the bottom plate.

2. A backrest lock with an improved pull-wire structure according to claim 1, characterized in that: The pull wire is a steel wire rope.

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