Adjustable seat pack return structure

Abstract

The utility model relates to the technical field of seat, and disclose a kind of adjustable seat bag recovery structure, including connecting shaft, the angle code piece and ratchet wheel rotatably covered on connecting shaft, and pawl for being used to brake ratchet wheel and being swingably arranged on angle code piece, ratchet wheel is connected with connecting shaft by torsion recovery component;Maintenance hole for being used to pass through tool to drive pawl to disengage from ratchet wheel is opened in angle code piece, and one end of ratchet wheel is exposed outward and is provided with twist force hole.The adjustable seat bag recovery structure provided by the utility model has the exposed design of maintenance hole, twist force hole, cooperates with the quick unlocking of pawl and the gear structure of ratchet wheel;Without disassembling seat bag cloth or outer plate, just using hex wrench and round nut wrench can complete adjustment, significantly improve maintenance efficiency.General tool operation and ratchet wheel standardization gear design avoid replacing torsion recovery component, ordinary staff can operate, reduce dependence on professional maintenance personnel, substantially reduce labor and parts cost.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to an adjustable seat cushion recovery structure. Background Technology

[0002] Since auditoriums, theaters and other similar venues often need to accommodate a large number of audience members and have extremely high requirements for space utilization efficiency, the seats are mainly equipped with a seat cushion concealed retraction mechanism. Compared with an external retraction mechanism, the seat cushion concealed retraction mechanism is hidden inside the seat and does not occupy additional public space such as auditorium aisles and seating areas, making the overall layout more regular and effectively avoiding the risk of audience members being injured due to accidental touch or bumping into external parts.

[0003] Existing seat-mounted return mechanisms require pre-adjustment of the seat's return force during installation before being installed onto the seat plate and covered with fabric or an outer panel. However, in actual installation scenarios, inconsistent seat return speeds often occur. Because the return mechanism is enclosed, if insufficient return force is detected, the fabric or seat plate must be removed for secondary adjustment. Some products don't even have an adjustment function, requiring the replacement of a torque-return component with a higher torque when insufficient return force is found. Regardless of the method, disassembly of the seat for maintenance is unavoidable. This maintenance method is not only cumbersome but also requires professional personnel with specific tools and skills, significantly increasing usage and maintenance costs and reducing user experience.

[0004] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a structure that allows for convenient adjustment of the seat cushion's return force without disassembling the seat cushion, using only simple tools, when the seat is fully installed and in normal use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An adjustable seat recovery structure is provided, which is disposed on the seat plate inside the seat and includes a connecting shaft, a corner bracket rotatably sleeved on the connecting shaft and a ratchet, and a pawl oscillatingly disposed on the corner bracket for braking the ratchet. The ratchet is connected to the connecting shaft through a torque recovery assembly. The corner bracket has a maintenance hole for a tool to pass through to drive the pawl out of the ratchet. One end of the ratchet is exposed outward and has a turning force hole.

[0008] As a further improvement to the above technical solution, the torque recovery component is a torque spring, the torque spring is sleeved on the connecting shaft, the connecting shaft is provided with a fixing screw for fixing one end of the torque spring, and the ratchet is provided with a traction hole for fixing to the other end of the torque spring.

[0009] As a further improvement to the above technical solution, the corner bracket is provided with a limiting screw that can abut against the fixing screw.

[0010] As a further improvement to the above technical solution, a sleeve for isolating the torsion spring is fitted on the connecting shaft.

[0011] As a further improvement to the above technical solution, the cross-section of the connecting shaft is polygonal, a first bushing and a second bushing are sleeved on the connecting shaft, a first adapter hole and a second adapter hole are provided on the corner bracket, the first bushing is connected to the first adapter hole, the ratchet is a hollow structure and is sleeved on the second bushing, and the ratchet is connected to the second adapter hole.

[0012] As a further improvement to the above technical solution, a cotter pin is provided on the connecting shaft to restrict the disengagement of the first bushing.

[0013] As a further improvement to the above technical solution, the pawl rotates around a pivot screw fixed on the corner bracket, and the pivot screw is provided with a torsion spring for driving the pawl to swing towards the ratchet.

[0014] As a further improvement to the above technical solution, the pawl is provided with a lifting insertion hole facing the maintenance hole.

[0015] As a further improvement to the above technical solution, the ratchet has multiple turning force holes arranged in a circumferential array.

[0016] As a further improvement to the above technical solution, a limit post is provided on the outer surface of the corner code.

[0017] The beneficial effects of this utility model are as follows: Compared with the prior art, the adjustable seat recovery structure provided by this utility model has an exposed design of maintenance holes and turning force holes, combined with a ratchet for quick unlocking and a ratchet for shifting; there is no need to disassemble the seat fabric or outer panel, and adjustment can be completed with only general tools such as hex wrenches and round nut wrenches, which significantly improves maintenance efficiency. There is no need to replace the torque recovery component, and ordinary workers can operate it, reducing reliance on professional maintenance personnel and greatly reducing labor and parts costs. Attached Figure Description

[0018] Figure 1 The three-dimensional adjustable seat recovery structure provided by this utility model Figure 1 .

[0019] Figure 2 The three-dimensional adjustable seat recovery structure provided by this utility model Figure 2 .

[0020] Figure 3 This is a schematic diagram illustrating the use of tools to adjust the seat cushion return force of the seat cushion return structure.

[0021] Figure 4 An exploded view of the adjustable seat recovery structure provided by this utility model.

[0022] Figure 5 This is a schematic diagram of the connection between a torsion spring and a ratchet.

[0023] Figure 6 This is a schematic diagram of the seat cushion recovery structure installed on the seat plate.

[0024] Explanation of main component symbols: 1-Connecting shaft, 11-Fixing screw, 2-Angle bracket, 21-Maintenance hole, 23-First adapter hole, 24-Second adapter hole, 25-Folding ear, 26-Vertical plate, 27-Flat plate, 3-Ratchet, 31-Traction hole, 32-Tightening force hole, 4-Pawl, 41-Lifting insertion hole, 51-Torsion spring, 52-Torsion spring, 53-Washer, 61-Limit screw, 62-Cotter pin, 63-Limit post, 64-Pivot screw, 71-Sleeve, 72-First bushing, 73-Second bushing, 81-Seat plate, 82-Protective cover, 91-Hex wrench, 92-Round nut wrench. Detailed Implementation

[0025] This utility model provides an adjustable seat recovery structure. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail 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 the scope of protection of this utility model.

[0026] Please see Figures 1 to 6 This utility model provides an adjustable seat cushion return structure. The adjustable seat cushion return structure is installed on the seat plate 81 inside the seat cushion and includes a connecting shaft 1, a corner bracket 2 rotatably sleeved on the connecting shaft 1 and a ratchet 3, and a pawl 4 oscillatingly mounted on the corner bracket 2 for braking the ratchet 3. The ratchet 3 is connected to the connecting shaft 1 through a torque return assembly. The corner bracket 2 has a maintenance hole 21 for a tool to pass through to drive the pawl 4 out of the ratchet 4. One end of the ratchet 3 is exposed outward and has a turning force hole 32.

[0027] The connecting shaft 1 is firmly fixed to the seat armrest, serving as a static support base for the entire seat cushion recovery structure; the angle bracket 2 is fixed to the seat plate 81 of the seat cushion, forming a rotatable connection with the connecting shaft 1. The ratchet 3 is a disc gear with special unidirectional sawtooth or trapezoidal teeth. Under normal conditions, the pawl 4 and the teeth of the ratchet 3 are tightly meshed, and when meshed, the ratchet 3 can only rotate in one direction relative to the pawl 4. When the seat is pressed down, the seat plate 81 drives the corner bracket 2 to rotate around the connecting shaft 1. Due to the preload provided by the torsion spring, the pawl 4 will form a dynamic balance after locking the teeth of the ratchet 3. That is, the ratchet 3 will not rotate relative to the pawl 4, but will swing synchronously with the corner bracket 2 and the pawl 4. During this process, the torque return component stores energy. When the external force is removed, the torque return component releases the stored energy and drives the ratchet 3 to rotate in the opposite direction. Since the pawl 4 continues to lock the teeth of the ratchet 3, through the working principle that the ratchet 3 can only rotate in one direction relative to the pawl 4, it drives the pawl 4 and the corner bracket 2 to rotate in the opposite direction together, so as to realize the automatic return of the seat plate and the seat.

[0028] Ratchet 3 divides the 360° circumference into 10-20 precise positions, each with an angle between 18° and 36°. When inconsistent seat return speeds occur during on-site installation, or when the torque spring 51 weakens after years of use, there is no need to disassemble the seat. Simply use a hex wrench 91 to lift the pawl 4 through the maintenance hole 21 on the corner bracket 2, disengaging it from the ratchet 3 and releasing the lock. Then, insert a round nut wrench 92 into the exposed tightening hole 32 at one end of the ratchet 3, and rotate the ratchet 3 in increments as needed: clockwise rotation increases the preload of the torque return component, enhancing the seat return force; counterclockwise rotation decreases the return force. After adjustment, remove the tools, and the pawl 4 will re-engage with the ratchet 3 under gravity or elasticity, fixing the adjusted state and ensuring stable seat return force.

[0029] Compared with existing technologies, the adjustable seat recovery structure provided by this utility model features an exposed design with maintenance holes 21 and tightening force holes 32, combined with a ratchet 4 for quick unlocking and a ratchet 3 with a geared structure. Adjustment can be completed using only a hex wrench 91 and a round nut wrench 92 without disassembling the seat fabric or outer panel, significantly improving maintenance efficiency. The universal tool operation and standardized geared design of the ratchet 3 eliminate the need to replace the torque recovery component, allowing ordinary workers to operate it, reducing reliance on professional maintenance personnel and significantly lowering labor and parts costs.

[0030] Specifically, the torque recovery assembly is a torsion spring 51, which is sleeved on the connecting shaft 1. The connecting shaft 1 is provided with a fixing screw 11 for fixing one end of the torsion spring 51, and the ratchet 3 is provided with a traction hole 31 for fixing to the other end of the torsion spring 51. The two ends of the torsion spring 51 are designed with hooks. On the one hand, the fixing screw 11 can be inserted into one hook end of the torsion spring 51, and the head of the fixing screw 11 presses the end of the torsion spring 51 tightly onto the connecting shaft 1; on the other hand, the other hook end of the torsion spring 51 can be engaged into the traction hole 31 of the ratchet 3, ensuring that the torsion spring 51 will not disengage from the ratchet 3. The torsion spring 51 is positioned in a limited space, so that even in frequent force and high impact scenarios (such as auditorium audiences quickly sitting down), the spring will not spring open or loosen due to torque.

[0031] Of course, in addition to using the torsion spring 51, the torque recovery assembly can also use spiral springs, rubber torsion blocks, disc springs, elastic polymer torsion bars, etc.

[0032] In practice, if the torsion spring 51 in its natural state (i.e., in a relaxed state with no torque) were to be set with a seat restoring force at the construction site, the pawl 4 would have to be lifted and the ratchet 3 rotated several times before the seat could be assembled. This would be labor-intensive and significantly reduce on-site construction efficiency. Therefore, the corner bracket 2 is equipped with a limiting screw 61 that can abut against the fixing screw 11, ensuring that the torsion spring of the restoring structure is in a certain pre-tensioned state at the factory and already possesses initial restoring force, which basically meets the requirements of on-site construction. There is no need to lift the pawl 4 and rotate the ratchet 4 several times to set the restoring force as before; the structure can simply be installed in place. If insufficient torque of the restoring structure is found during on-site use, adjustments can be made, reducing the workload and improving construction efficiency.

[0033] At the factory, the torsion spring 51 is preloaded by the limit screw 61. During on-site installation, there is no need to rotate the ratchet 4 multiple times to set the restoring force, which eliminates the originally cumbersome initial adjustment steps. Construction personnel can directly assemble it, which significantly reduces construction time and improves on-site construction efficiency. It is especially suitable for places such as auditoriums and theaters that require a large number of seats.

[0034] Furthermore, a sleeve 71 is fitted onto the connecting shaft 1 to isolate the torsion spring 51. Made of Teflon, the sleeve 71 has an extremely low coefficient of friction and excellent wear resistance, effectively isolating the torsion spring 51 from direct contact with the connecting shaft 1. During frequent use of the seat, the frictional noise generated by the relative movement of the spring and shaft during the seat's compression and recovery is significantly reduced. Actual measurements show that after installing the sleeve 71, the seat's operating noise is reduced from 45 decibels in the traditional structure to below 25 decibels, effectively eliminating interference caused by seat friction in quiet environments such as auditoriums and theaters, and significantly improving the comfort of the audience's viewing experience.

[0035] In this embodiment, the cross-section of the connecting shaft 1 is polygonal (such as hexagonal). When it is installed into the polygonal fixing hole corresponding to the handrail, the edges of the polygon form a surface contact with the inner wall of the handrail fixing hole. This surface contact method can effectively limit the rotation and displacement of the connecting shaft 1 in the handrail hole.

[0036] In fact, the corner bracket 2 includes a corner bracket body and a folded lug 25 disposed on the flat plate portion 27 of the corner bracket body. The folded lug 25 is parallel to the vertical plate portion 26 of the corner bracket body. A first bushing 72 and a second bushing 73 are sleeved on the connecting shaft 1. The corner bracket 2 has a coaxial first adapter hole 23 and a second adapter hole 24. The first adapter hole 23 is located on the folded lug 25, and the second adapter hole 24 is located on the vertical plate portion 26. The first bushing 72 is connected to the first adapter hole 23. The ratchet 3 has a hollow structure and is sleeved on the second bushing 73. The ratchet 3 is connected to the second adapter hole 24. The inner diameters of the first bushing 72 and the second bushing 73 are precisely machined according to the polygonal cross-sectional dimensions of the connecting shaft 1, while the outer diameters are designed according to the tolerance range of the adapter hole of the corner bracket 2 and the inner hole of the ratchet 3. By setting the first bushing 72 and the second bushing 73, it can be ensured that the corner bracket 2 and the ratchet 3 rotate smoothly around the connecting shaft 1.

[0037] When the seat is subjected to frequent downward and rebound forces during use, the first bushing 72 may experience axial displacement due to vibration or other reasons. Therefore, a cotter pin 62 is provided on the connecting shaft 1 to prevent the first bushing 72 from disengaging. The cotter pin 62 effectively prevents the first bushing 72 from moving axially along the connecting shaft 1, ensuring that it maintains a stable fit with the first adapter hole 23 of the angle bracket 2. This prevents the angle bracket 2 from swaying abnormally due to the first bushing 72 disengaging, thus affecting the normal rebound function of the seat.

[0038] The pawl 4 rotates around a pivot screw 64 fixed to the corner bracket 2. The pivot screw 64 is equipped with a torsion spring 52 that drives the pawl 4 to swing towards the ratchet 3. The torsion spring 52 continuously provides the pawl 4 with an elastic torque to swing towards the ratchet 3. When the seat is pressed down, causing the corner bracket 2 to swing, the pawl 4 remains firmly against the teeth of the ratchet 3 under the action of the torsion spring 52. Even in high-frequency use or vibration environments, this ensures the stable and reliable one-way locking function between the pawl 4 and the ratchet 3, preventing accidental seat retraction or locking failure due to pawl 4 loosening. Furthermore, as the seat is used over time, the teeth of the pawl 4 and the ratchet 3 may wear due to friction, leading to an increased meshing clearance. The elastic force of the torsion spring 52 automatically compensates for this clearance, maintaining close contact between the pawl 4 and the ratchet 3 by continuously pushing the pawl 4.

[0039] To avoid rigid contact between the pawl 4 and the corner bracket 2, a gasket 53 is provided between the pawl 4 and the corner bracket 2.

[0040] To reliably actuate the pawl 4, a lifting insertion hole 41 facing the maintenance hole 21 is provided on the pawl 4. Specifically, the lifting insertion hole 41 can be a round hole, with a diameter only slightly larger than the outer diameter of the hex wrench 91, allowing for quick insertion without precise alignment. During maintenance, the operator simply inserts the hex wrench 91 into the maintenance hole 21; the natural guidance of the hole's shaft allows it to easily engage the lifting insertion hole 41. Applying upward force then lifts the pawl 4, separating it from the ratchet 3. This is particularly suitable for high-altitude operations or dimly lit environments, eliminating the need for precise visual alignment and allowing operation through touch, significantly reducing maintenance difficulty.

[0041] Understandably, lifting the socket 41 allows for direct compatibility with commonly available hex wrenches 91 (such as 4mm and 5mm sizes), eliminating the need for custom-shaped tools. Maintenance personnel in venues like auditoriums and theaters can perform operations using their everyday wrenches without needing to purchase specialized tools, thus reducing tool costs. Furthermore, the use of standardized tools prevents maintenance delays caused by tool shortages.

[0042] Preferably, the ratchet 3 has multiple tightening holes 32 arranged in a circumferential array. The operator can select any one of the tightening holes 32 to insert a round nut wrench 92 for adjustment, depending on space constraints and tool grip angle.

[0043] A limiting post 63 is provided on the outer surface of the corner bracket 2. By cooperating with the armrest, the limiting post 63 limits the rotation range of the seat 81, allowing the seat 81 to rotate within a reasonable angle range. This ensures that the seat's tilt angle meets ergonomic requirements when the audience sits down, improving seating comfort. It also ensures that the seat returns to a reasonable position.

[0044] Preferably, the corner bracket 2 is provided with a protective cover 82 to protect the ratchet 3 and the pawl 4. The protective cover 82 tightly covers the outside of the ratchet 3 and the pawl 4, forming a physical barrier, effectively preventing the filling materials such as sponge, fabric fibers, and foam particles in the seat from entering the rotation gap between the ratchet 3 and the pawl 4, solving problems such as seat recovery failure and pawl 4 jamming caused by foreign objects, and ensuring long-term stable operation of the seat.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. An adjustable seat cushion return structure, wherein the adjustable seat cushion return structure is disposed on a seat plate inside the seat cushion, characterized in that, It includes a connecting shaft, a corner bracket and a ratchet rotatably mounted on the connecting shaft, and a pawl oscillatingly mounted on the corner bracket for braking the ratchet. The ratchet is connected to the connecting shaft via a torque return assembly. The corner bracket has a maintenance hole for a tool to pass through to drive the pawl away from the ratchet. One end of the ratchet is exposed outward and has a turning force hole.

2. The adjustable seat cushion return structure according to claim 1, characterized in that, The torque recovery assembly is a torque spring, which is sleeved on the connecting shaft. The connecting shaft is provided with a fixing screw for fixing one end of the torque spring, and the ratchet is provided with a traction hole for fixing to the other end of the torque spring.

3. The adjustable seat cushion recovery structure according to claim 2, characterized in that, The corner bracket is provided with a limiting screw that can abut against the fixing screw.

4. The adjustable seat cushion return structure according to claim 2, characterized in that, A sleeve for isolating the torsion spring is fitted onto the connecting shaft.

5. The adjustable seat cushion return structure according to claim 1, characterized in that, The cross-section of the connecting shaft is polygonal. A first bushing and a second bushing are fitted on the connecting shaft. A first adapter hole and a second adapter hole are provided on the corner bracket. The first bushing is connected to the first adapter hole. The ratchet is a hollow structure and is fitted on the second bushing. The ratchet is connected to the second adapter hole.

6. The adjustable seat cushion recovery structure according to claim 5, characterized in that, The connecting shaft is provided with a cotter pin to prevent the first bushing from disengaging.

7. The adjustable seat cushion recovery structure according to claim 1, characterized in that, The pawl rotates about a pivot screw fixed to a corner bracket, and the pivot screw is provided with a torsion spring for driving the pawl to swing towards the ratchet.

8. The adjustable seat cushion return structure according to claim 1, characterized in that, The pawl has a lifting insertion hole facing the maintenance hole.

9. The adjustable seat cushion return structure according to claim 1, characterized in that, The ratchet has multiple turning holes arranged in a circumferential array.

10. The adjustable seat cushion return structure according to claim 1, characterized in that, Limiting posts are provided on the outer surface of the corner bracket.

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