Novel torsion bar backrest return mechanism

Abstract

The utility model discloses a novel torsion bar backrest return mechanism which is used on a backrest assembly and a framework lower connecting assembly of a commercial vehicle seat, and the backrest assembly can rotate around the framework lower connecting assembly. The fixed end of the torsion bar backrest return mechanism is fixed to the inner side of the framework lower connecting assembly, and the other end of the torsion bar backrest return mechanism is fixed to the lower side end of the backrest assembly. When the backrest assembly rotates around the framework lower connecting assembly, the torsion bar backrest return mechanism can deform and generate elastic force, and the backrest assembly can return by means of the elastic force. The torsion bar backrest return mechanism comprises a first torsion bar and a second torsion bar, the fixed end of the first torsion bar and the fixed end of the second torsion bar are fixed to the inner side of the framework lower connecting assembly through a fixing support, and the movable end of the first torsion bar and the movable end of the second torsion bar are clamped to the lower side end of the backrest assembly and fixed through a pressing plate.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial vehicle seats, in particular to a novel torsion bar backrest return mechanism. Background Art

[0002] In the field of commercial vehicle seats, with the increasing demand for driving comfort and ease of operation, the function and performance of seat backs have received more attention. Traditional commercial vehicle seat backs have some design deficiencies:

[0003] First, the return function of the backrest is not perfect. In many cases, the backrest cannot automatically return to the original position after the angle is adjusted, or the return process is not smooth and accurate enough, which brings inconvenience to the driver, especially when the backrest angle is adjusted frequently.

[0004] Secondly, during the connection and rotation process between the backrest and the seat frame, the stability of torque transmission is poor, which leads to problems such as loose connection and inaccurate angle adjustment during long-term use or frequent adjustment of the backrest angle, affecting the service life and comfort of the seat. Utility Model Content

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a novel torsion bar backrest return mechanism to solve the above-mentioned defects.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A novel torsion bar backrest return mechanism is used on the backrest assembly and the lower frame connection assembly of a commercial vehicle seat. The backrest assembly can rotate around the lower frame connection assembly.

[0008] The fixed end of the torsion bar backrest return mechanism is fixed to the inner side of the lower connecting assembly of the frame, and the other end of the torsion bar backrest return mechanism is fixed to the lower side end of the backrest assembly; when the backrest assembly rotates around the lower connecting assembly of the frame, the torsion bar backrest return mechanism will deform and generate elastic force, and the backrest assembly can return to its original position by relying on this elastic force.

[0009] In one or more embodiments of the present invention, the torsion bar backrest return mechanism includes a first torsion bar and a second torsion bar, the fixed ends of the first torsion bar and the second torsion bar are fixed to the inner side of the lower connection assembly of the skeleton through a fixed bracket, and the movable ends of the first torsion bar and the second torsion bar are clamped at the lower side end of the backrest assembly and fixed by a pressure plate.

[0010] In one or more embodiments of the present invention, the backrest assembly includes a backrest main frame, and a closing rod is fixed on the open side of the backrest main frame; the movable ends of the first torsion bar and the second torsion bar are formed with hooks, which are clamped on the closing rod by the hooks, and a semicircular groove is formed on the inner side of the pressure plate, and the movable ends of the first torsion bar and the second torsion bar are limited and fixed by the semicircular groove; upper connecting frames are respectively fixed on the outer sides of both ends of the backrest main frame, and the lower side ends of the upper connecting frames are rotatably connected to the lower connecting assembly of the frame, and a connecting rotating rod is fixed between the two upper connecting frames.

[0011] In one or more embodiments of the present invention, the skeleton lower connecting assembly includes two relatively arranged lower connecting plates, and the backrest assembly is rotatably arranged between the two lower connecting plates; the fixed bracket is fixed to the inner side of the lower connecting plate, and the fixed ends of the first torsion bar and the second torsion bar are inserted into the fixed bracket.

[0012] In one or more embodiments of the present invention, an outward bending end is formed on the upper side of the fixing bracket, a slot is provided in the middle of the bending end, a circular hole is provided on the fixing bracket, and the fixed ends of the first torsion bar and the second torsion bar are fixed by the slot and the circular hole.

[0013] In one or more embodiments of the present invention, the pressing plate is fixed to the closing rod by bolts, and a bending portion is formed on the upper end of the pressing plate, and the bending portion is adapted to the upper side of the closing rod.

[0014] Beneficial effects of the utility model:

[0015] The utility model discloses a novel torsion bar backrest return mechanism that realizes automatic return of the backrest assembly through the torsion bar backrest return mechanism. When the driver adjusts the backrest angle, the backrest assembly rotates about the frame lower connection assembly, and the torsion bar deforms and accumulates force. When the external force disappears or resetting is required, the stored elastic force of the torsion bar causes the backrest to automatically return to its original position. This function greatly improves user convenience, especially when the vehicle is frequently used and the driver adjusts the backrest angle frequently. The backrest position can be restored without manual operation, saving time and energy. The fixed ends of the first torsion bar and the second torsion bar are fixed by slots and round holes on the fixing bracket, and the movable ends are fixed to the backrest assembly by a pressure plate. This double-end stable fixation method can effectively ensure the connection strength between the torsion bar, the fixing bracket, and the backrest during the backrest rotation process. Whether it is a small angle adjustment during normal driving or a larger angle change caused by special circumstances (such as vehicle bumps, sudden braking, etc.), the torsion bar can stably function, reliably withstand and transmit torsional force, and avoid the problem of uncontrolled backrest angle due to loose or unstable connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a front view of the present utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In this embodiment, Figures 1 to 2 As shown, a novel torsion bar backrest return mechanism is used on the backrest assembly and the lower frame connection assembly of a commercial vehicle seat. The backrest assembly can rotate around the lower frame connection assembly; the fixed end of the torsion bar backrest return mechanism is fixed to the inner side of the lower frame connection assembly, and the other end of the torsion bar backrest return mechanism is fixed to the lower side end of the backrest assembly; when the backrest assembly rotates around the lower frame connection assembly, the torsion bar backrest return mechanism will deform and generate elastic force, and the backrest assembly can return to its original position by relying on this elastic force.

[0020] In this embodiment, when the backrest assembly rotates around the lower connecting assembly of the frame, the torsion bar backrest return mechanism will store force. When the backrest assembly needs to be reset, the force stored in the torsion bar backrest return mechanism will be released, causing the backrest assembly to automatically reset.

[0021] In one or more embodiments of the present invention, the torsion bar backrest return mechanism includes a first torsion bar 1 and a second torsion bar 2, and the fixed ends of the first torsion bar 1 and the second torsion bar 2 are fixed to the inner side of the lower connection assembly of the skeleton through a fixed bracket 3, and the movable ends of the first torsion bar 1 and the second torsion bar 2 are clamped at the lower side end of the backrest assembly and fixed by a pressure plate 4.

[0022] In this embodiment, the first and second torsion bars 1 and 2 have the same structure. A torsion bar is a mechanical component primarily used to withstand torsional forces (torque) and produce elastic deformation to achieve a specific mechanical function. The first and second torsion bars 1 and 2 are elongated rod-like structures with opposing bends, and are typically made of a metal with a high elastic modulus, such as spring steel. Rotation of the backrest assembly drives the movable ends of the first and second torsion bars 1 and 2 to rotate, causing the main bodies of the first and second torsion bars 1 and 2 to twist and undergo elastic deformation.

[0023] In one or more embodiments of the present invention, the backrest assembly includes a backrest main frame 8, and a closing rod 9 is fixed to the open side of the backrest main frame 8; the movable ends of the first torsion bar 1 and the second torsion bar 2 are formed with hooks, which are clamped on the closing rod 9 by the hooks, and a semicircular groove is formed on the inner side of the pressure plate 4, and the movable ends of the first torsion bar 1 and the second torsion bar 2 are limited and fixed by the semicircular groove; upper connecting frames 5 are respectively fixed to the outer sides of both ends of the backrest main frame 8, and the lower side ends of the upper connecting frames 5 are rotatably connected to the lower connecting assembly of the frame, and a connecting rotating rod 6 is fixed between the two upper connecting frames 5.

[0024] In this embodiment, the back main frame 8 forms the main shape of the backrest, and a planar cavity is formed in the middle of the back main frame 8 and the closing rod 9. The planar cavity is fixed into a criss-cross mesh structure by a number of fixing bars to ensure the stability of the backrest; the movable ends of the first torsion bar 1 and the second torsion bar 2 are limited and fixed by the semicircular groove of the pressure plate 4, so that the connection is more stable.

[0025] In one or more embodiments of the present invention, the skeleton lower connecting assembly includes two relatively arranged lower connecting plates 7, and the backrest assembly is rotatably arranged between the two lower connecting plates 7; the fixed bracket 3 is fixed to the inner side of the lower connecting plate 7, and the fixed ends of the first torsion bar 1 and the second torsion bar 2 are inserted into the fixed bracket 3.

[0026] In this embodiment, the lower connecting plate 7 and the upper connecting frame 5 are rotatably connected via an angle adjuster or a hinge structure.

[0027] In one or more embodiments of the present invention, the upper side of the fixing bracket 3 forms an outward bent end, a slot is provided in the middle of the bent end, a circular hole is provided on the fixing bracket 3, and the fixed ends of the first torsion bar 1 and the second torsion bar 2 are fixed by the slot and the circular hole.

[0028] In this embodiment, the fixed ends of the first and second torsion bars 1 and 2 are secured by a fixing bracket 3, while their movable ends are secured to the seat back via a pressure plate 4. This connection is crucial for transmitting torque and enabling the seat back's rotational function. For example, when the seat back is rotated by an external force, the torsion bars can function stably through the fixing bracket 3 and pressure plate 4, while also better absorbing the corresponding torsional forces, ensuring the stability and reliability of the seat back's angle adjustment.

[0029] In one or more embodiments of the present invention, the pressing plate 4 is fixed to the closing rod 9 by bolts, and a bending portion is formed on the upper end of the pressing plate 4 , and the bending portion is adapted to the upper side of the closing rod 9 .

[0030] In this embodiment, the formed bent portion facilitates installation and positioning.

[0031] Working principle of this utility model:

[0032] The backrest assembly rotates around the lower connecting assembly of the frame through a rotating connection (angle adjuster or hinge structure) between the upper connecting frame 5 and the lower connecting assembly of the frame (lower connecting plate 7); when an external force acts on the backrest assembly, the backrest assembly rotates around the rotating connection point, and the position of the backrest assembly changes during this process; the fixed ends of the first torsion bar 1 and the second torsion bar 2 are fixed to the inner side of the lower connecting assembly of the frame, and the movable ends are fixed to the lower side ends of the backrest assembly; when the backrest assembly rotates, the movable end of the torsion bar rotates with the backrest, causing the torsion bar body to twist and produce elastic deformation, thereby storing force. When the external force disappears, the elastic force accumulated in the torsion bar is released, driving the backrest assembly back to its original position, realizing the automatic return function.

[0033] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," "right," and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the product of the present invention is typically placed when in use, or the positions or locations commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific position, be constructed, or operate in a specific position. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A novel torsion bar backrest return mechanism, which is used on the backrest assembly and the lower frame connection assembly of a commercial vehicle seat. The backrest assembly can rotate around the lower frame connection assembly and is characterized by: The fixed end of the torsion bar backrest return mechanism is fixed to the inner side of the lower connecting assembly of the frame, and the other end of the torsion bar backrest return mechanism is fixed to the lower side end of the backrest assembly; when the backrest assembly rotates around the lower connecting assembly of the frame, the torsion bar backrest return mechanism will deform and generate elastic force, and the backrest assembly can return to its original position by relying on this elastic force.

2. The novel torsion bar backrest return mechanism according to claim 1 is characterized in that: The torsion bar backrest return mechanism comprises a first torsion bar (1) and a second torsion bar (2), wherein the fixed ends of the first torsion bar (1) and the second torsion bar (2) are fixed to the inner side of the lower connection assembly of the frame through a fixing bracket (3), and the movable ends of the first torsion bar (1) and the second torsion bar (2) are clamped at the lower side end of the backrest assembly and fixed through a pressure plate (4).

3. The novel torsion bar backrest return mechanism according to claim 2 is characterized in that: The backrest assembly includes a backrest main frame (8), and a closing rod (9) is fixed to the open side of the backrest main frame (8); the movable ends of the first torsion bar (1) and the second torsion bar (2) are formed with hooks, which are clamped on the closing rod (9) through the hooks, and the inner side of the pressure plate (4) is formed with a semicircular groove, and the movable ends of the first torsion bar (1) and the second torsion bar (2) are limited and fixed by the semicircular groove; the outer sides of the two ends of the backrest main frame (8) are respectively fixed with upper connecting frames (5), the lower side ends of the upper connecting frames (5) are rotatably connected to the frame lower connecting assembly, and a connecting rotating rod (6) is fixed between the two upper connecting frames (5).

4. The novel torsion bar backrest return mechanism according to claim 2 is characterized in that: The skeleton lower connection assembly comprises two lower connection plates (7) arranged opposite to each other, and the backrest assembly is rotatably arranged between the two lower connection plates (7); the fixed bracket (3) is fixed to the inner side of the lower connection plate (7), and the fixed ends of the first torsion bar (1) and the second torsion bar (2) are inserted into the fixed bracket (3).

5. The novel torsion bar backrest return mechanism according to claim 4 is characterized in that: The upper side of the fixing bracket (3) forms an outwardly bent end, the middle of the bent end is provided with a slot, and the fixing bracket (3) is provided with a circular hole, and the fixed ends of the first torsion bar (1) and the second torsion bar (2) are fixed via the slot and the circular hole.

6. The novel torsion bar backrest return mechanism according to claim 3 is characterized in that: The pressing plate (4) is fixed to the closing rod (9) by means of bolts, and a bending portion is formed on the upper side end of the pressing plate (4), and the bending portion is adapted to the upper side of the closing rod (9).

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