Adjusting device of waistband tensioning mechanism

Abstract

The utility model provides a belt tensioning mechanism adjusting device, which is characterized in that a belt winding wheel is matched and connected with a ratchet wheel and a belt, so that the belt winding wheel synchronously moves to wind the belt, one end of a fixed pawl component is fixed on a seat, and the other end of the fixed pawl component is provided with a support, an inclined surface matched with a movable pawl to move and a fixed pawl unidirectionally meshed with the ratchet wheel; the movable pawl assembly comprises a rocker arm and a movable pawl in a one-way meshing structure with the ratchet wheel, the rocker arm and the movable pawl are connected through a fixed shaft and rotate around the fixed shaft, a limiting step is arranged on the support, the ratchet wheel is pushed through the movable pawl, the waistband is rolled, and the tightened waistband is limited and kept tightened through the one-way meshing structure of the fixed pawl and the ratchet wheel. The movable pawl is matched with the inclined face to jack up the fixed pawl, disengage from meshing with the ratchet wheel and move to the limiting step, and after the fixed pawl moves to the limiting position, the movable pawl is pressed up to disengage from meshing with the ratchet wheel through matching of the inclined face, and the restrained waistband is released.

Description

Technical Field

[0001] This utility model belongs to the field of aircraft ejection rescue and relates to a belt tensioning mechanism adjustment device. Background Technology

[0002] Ejection seats include a lumbar restraint system for adjusting the pilot's lumbar support. Before takeoff, the pilot needs to adjust the lumbar restraint to ensure it is in a normal restraint position. During normal flight, especially in cruise mode, prolonged restraint can exacerbate discomfort and increase pilot fatigue, necessitating the release of the lumbar restraint. Existing lumbar belt adjustments fall into two categories: one using a connecting strap, and the other using a lever. Adjusting the connecting strap suffers from poor restraint effectiveness and inconvenience. The lever-adjustment method is complex, unreliable, and difficult to maintain. Utility Model Content

[0003] The purpose of this utility model is to provide a belt tensioning mechanism adjustment device that has a simple structure, high reliability, and good usability and maintainability.

[0004] The technical solution of this utility model is: a belt tensioning mechanism adjustment device, including a belt winding pulley, a ratchet, a belt, a fixed pawl assembly, and a movable pawl assembly. The belt winding pulley is internally connected to the ratchet and externally connected to the belt, so that the belt winding pulley moves synchronously to wind up the belt. One end of the fixed pawl assembly is fixed to the seat, and the other end is provided with a support, an inclined surface that moves in conjunction with the movable pawl, and a fixed pawl with a one-way meshing structure with the ratchet. The movable pawl assembly includes a rocker arm and a movable pawl with a one-way meshing structure with the ratchet. One end is connected to the movable pawl via a fixed axis and rotates around it, while the other end is connected to the center point of the ratchet. A limit step is provided on the support. The movable pawl pushes the ratchet to retract the belt. The unidirectional meshing structure between the fixed pawl and the ratchet limits and keeps the tightened belt taut. The movable pawl engages with the inclined plane to lift the fixed pawl, disengaging it from the ratchet and moving it to the limit step. After the fixed pawl reaches its limit position, the inclined plane presses the movable pawl up to disengage it from the ratchet, releasing the restrained belt.

[0005] In the above scheme, the fixed pawl assembly further includes a first spring and a first rotating shaft. The first rotating shaft is connected to the support, and the support is fixed to the seat. The fixed pawl is connected to the first rotating shaft and can rotate around the first rotating shaft.

[0006] In the above scheme, one end of the fixed pawl is connected to the first rotating shaft, and the other end is connected to the first spring, so that the fixed pawl engages with the ratchet under the action of the first spring.

[0007] In the above scheme, the inclined surface provided on the fixed pawl has a movement that cooperates with the movable pawl.

[0008] One end of the first spring is connected to the support, and the other end is connected to the fixed pawl.

[0009] In the above scheme, the first spring is a torsion spring, a compression spring, or a tension spring.

[0010] In the above scheme, the compression amount of the first spring is determined based on the fact that the spring does not deform when the fixed pawl engages with the ratchet and moves to the limit step.

[0011] In the above scheme, the movable pawl assembly further includes a second spring and a second rotating shaft. The second rotating shaft is connected to the rocker arm. One end of the movable pawl is connected to the second rotating shaft and rotates around the second rotating shaft. The other end is connected to the second spring, which pushes the movable pawl to engage with the ratchet.

[0012] In the above scheme, the second spring is a torsion spring, compression spring or tension spring, with one end connected to the rocker arm and the other end connected to the movable pawl.

[0013] In the above scheme, the center point is concentric with the pulley, or it can be set at any other point.

[0014] The advantages and beneficial effects of this utility model are as follows: It provides a waist belt tensioning mechanism adjustment device, which realizes the tightening and releasing of the waist belt through a fixed pawl assembly and a movable pawl assembly, solving the technical problems of complex structure and low reliability of waist belt constraint adjustment devices. The device is easy to implement, widely adaptable, and easy to use and maintain. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the fixed ratchet assembly structure of this utility model;

[0017] An inclined surface A, in which the fixed pawl and the movable pawl move in coordination, has a limit step B on the support;

[0018] Figure 3 This is a simplified structural diagram of the movable ratchet assembly of this utility model;

[0019] The movable pawl assembly has a rotation center C and a connection point D on the movable pawl.

[0020] In the figure, 1-pulley, 2-ratchet, 3-belt, 4-fixed pawl assembly, 5-movable pawl assembly, 6-fixed pawl, 7-first spring, 8-first pivot, 9-support, 10-rocker arm, 11-movable pawl, 12-second spring, 13-second pivot. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] See Figure 1 A belt tensioning mechanism adjustment device includes a belt winding pulley 1, a ratchet 2, a belt 3, a fixed pawl assembly 4, and a movable pawl assembly 5; the belt winding pulley 1 is connected to the belt 3 and is used to wind up the belt; the ratchet 2 is connected to the belt winding pulley 1 to ensure synchronous movement; one end of the fixed pawl assembly 4 is fixed to the seat, and the other end is connected to the ratchet 2; one end of the movable pawl assembly 5 is connected to rotate around a fixed axis, and the other end is connected to the ratchet 2.

[0023] The fixed pawl assembly 4 includes a fixed pawl 6, a first spring 7, a first rotating shaft 8, and a support 9; the support 9 is fixed to the seat, and the first rotating shaft 8 is connected to the support 9; the fixed pawl 6 is connected to the first rotating shaft 8 and can rotate around the first rotating shaft 8.

[0024] One end of the fixed pawl 6 is connected to the first rotating shaft 8, and the other end is connected to the first spring 7. The fixed pawl 6 on the fixed pawl assembly 4 engages with the ratchet 2 under the action of the first spring 7. The engagement between the fixed pawl 6 and the ratchet 2 is a one-way engagement structure. The fixed pawl 6 has an inclined surface A, which engages with the movable pawl 11 when the movable pawl 11 moves. The support 9 has a limiting step B to limit the rotation of the fixed pawl 6.

[0025] One end of the first spring 7 is connected to the support 9, and the other end is connected to the fixed pawl 6. It can be a torsion spring, compression spring, or tension spring. The compression of the first spring should be sufficient to ensure that after installation, the fixed pawl can engage with the ratchet, and the spring will not undergo plastic deformation when it moves to the limit step B.

[0026] The support 9 has a limiting step B to limit the rotation of the fixed pawl 6. The limiting step B should be able to limit the rotation after the fixed pawl is completely disengaged from the ratchet.

[0027] The movable pawl assembly 5 includes a rocker arm 10, a movable pawl 11, a second spring 12, and a second rotating shaft 13.

[0028] The rocker arm 10 rotates around the center point C, which can be concentric with the pulley or at other points; the connection point D is set on the rocker arm 10 and is connected to the belt handle, which pulls the rocker arm to rotate; the second rotating shaft 13 is connected to the rocker arm 10.

[0029] One end of the movable pawl 11 is connected to the second rotating shaft 13 and rotates around the second rotating shaft 13, while the other end is connected to the second spring 12. The spring pushes the movable pawl 11 to engage with the ratchet 6. The engagement between the movable pawl 11 and the ratchet 2 is a one-way engagement structure.

[0030] The second spring 12 is connected to the rocker arm 10 at one end and to the movable pawl 11 at the other end. It can be a torsion spring, compression spring, or tension spring.

[0031] The belt tensioning mechanism's adjustment device achieves the tightening and releasing functions of the belt through the movement of the movable pawl assembly.

[0032] The belt tightening function:

[0033] (1) The movable pawl assembly 5 pushes the ratchet 2 through the movable pawl 11 to retract the belt;

[0034] (2) The fixed pawl assembly 4, through the one-way meshing structure of the fixed pawl 6 and the ratchet, limits the tightened belt and keeps it in a tightened state.

[0035] The belt release function:

[0036] (1) The movable pawl assembly 5, through the engagement of the movable pawl 11 with the inclined surface A on the fixed pawl 6, lifts the fixed pawl, disengages it from the ratchet, and moves it to the limiting step B.

[0037] (2) The fixed pawl 6, after moving to the limit position, presses up the movable pawl through the cooperation of the inclined plane A, so that the movable pawl is pressed up and disengaged from the ratchet, thereby realizing the release function of the belt constraint.

[0038] The above technical solutions are merely preferred embodiments of this utility model and should not be construed as limiting the scope of this utility model. Therefore, any equivalent changes made in accordance with the scope of this utility model patent shall still fall within the protection scope of this utility model.

Claims

1. A belt tensioning mechanism adjustment device, comprising a belt winding wheel (1), a ratchet (2), a belt (3), a fixed pawl assembly (4), and a movable pawl assembly (5), wherein the belt winding wheel (1) is internally connected to the ratchet (2) and externally connected to the belt (3), so that the belt winding wheel (1) moves synchronously to wind up the belt (3), characterized in that, The fixed pawl assembly (4) is fixed at one end to the seat, and the other end is provided with a support (9), an inclined surface (A) that moves in conjunction with the movable pawl (11), and a fixed pawl (6) that engages with the ratchet (2) in one direction; the movable pawl assembly (5) includes a rocker arm (10) and a movable pawl (11) that engages with the ratchet (2) in one direction, one end of the rocker arm (10) is connected to the movable pawl (11) through a fixed axis and rotates around it, and the other end is connected to the center point (C) of the ratchet (2), and the support (9) is provided with A limiting step (B) is set, and the ratchet (2) is pushed by the movable pawl (11) to roll up the waist belt. The tightened waist belt is limited and kept tight by the one-way meshing structure of the fixed pawl (6) and the ratchet. The movable pawl (11) cooperates with the inclined plane (A) to lift the fixed pawl, disengage it from the ratchet, and move to the limiting step (B). After the fixed pawl (6) moves to the limit position, the movable pawl is pressed up by the inclined plane (A) to disengage it from the ratchet, and the restrained waist belt (3) is released.

2. The belt tensioning mechanism adjustment device as described in claim 1, characterized in that, The fixed pawl assembly (4) also includes a first spring (7) and a first rotating shaft (8). The first rotating shaft (8) is connected to the support (9), and the support (9) is fixed to the seat. The fixed pawl (6) is connected to the first rotating shaft (8) and can rotate around the first rotating shaft (8).

3. The belt tensioning mechanism adjustment device as described in claim 2, characterized in that, One end of the fixed pawl (6) is connected to the first rotating shaft (8), and the other end is connected to the first spring (7), so that the fixed pawl (6) engages with the ratchet (2) under the action of the first spring (7).

4. The belt tensioning mechanism adjustment device as described in claim 3, characterized in that, The inclined surface (A) provided on the fixed pawl (6) moves in coordination with the movable pawl (11).

5. The belt tensioning mechanism adjustment device as described in claim 2, characterized in that, One end of the first spring (7) is connected to the support (9), and the other end is connected to the fixed pawl (6).

6. The belt tensioning mechanism adjustment device as described in claim 5, characterized in that, The first spring (7) is a torsion spring, a compression spring, or a tension spring.

7. The belt tensioning mechanism adjustment device as described in claim 6, characterized in that, The compression amount of the first spring (7) is determined based on the fact that the spring does not deform when the fixed pawl engages with the ratchet and moves to the limit step (B).

8. The belt tensioning mechanism adjustment device as described in claim 1, characterized in that, The movable pawl assembly (5) also includes a second spring (12) and a second rotating shaft (13). The second rotating shaft (13) is connected to the rocker arm (10). One end of the movable pawl (11) is connected to the second rotating shaft (13) and rotates around the second rotating shaft (13). The other end is connected to the second spring (12). The second spring (12) pushes the movable pawl (11) to engage with the ratchet (2).

9. The belt tensioning mechanism adjustment device as described in claim 8, characterized in that, The second spring (12) is a torsion spring, compression spring or tension spring, with one end connected to the rocker arm (10) and the other end connected to the movable pawl (11).

10. The belt tensioning mechanism adjustment device as described in claim 1, characterized in that, The center point (C) is concentric with the pulley, or can be set at any point.

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