Back chasing structure of seat

Abstract

The utility model relates to the technical field of seats, in particular to a seat back chasing structure which comprises a seat frame and a back support, supporting frames are symmetrically arranged at the bottom of the seat frame, the front ends of the supporting frames are connected with the two sides of the bottom end of the back support respectively, the bottom of the seat frame is connected with the supporting frames through a plurality of movable rods, and the movable rods are connected with the back support. Linkage shafts are symmetrically connected between the front end of the seat frame and the bottom end of the back support through connecting shafts, a transverse shaft is arranged between the front ends of the supporting frames, the two sides of the outer portion of the transverse shaft are each sleeved with a spiral spring, and a linkage piece is jointly connected between the spiral springs; an air cylinder used for pneumatically locking the angle position of the back support is arranged between the front ends of the supporting frames. According to the back chasing structure of the seat, the high-performance spiral spring is adopted to replace an air spring, and an innovative pneumatic locking structure is combined, so that a user can quickly and accurately adjust and fix the seat back to an ideal position, and the use convenience and comfort of the seat are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, and particularly to a seat back chasing structure. Background Technique

[0002] With the acceleration of the work and life rhythms, the health problems faced by office workers due to long-term sedentary sitting are becoming increasingly serious, especially the frequent occurrence of occupational diseases such as neck, shoulder, and waist pain. Therefore, the design concept of push-back seats has emerged, aiming to adapt to and support the natural posture of the human body through personalized adjustment of the seats, and reduce the health risks brought by long-term sitting.

[0003] The patent with the application number CN202322413668.6 discloses a push-back seat. The utility model adds an installation groove in the seat, places the gas spring in the installation groove, and the connection point between the transmission rod and the back bracket is always within the enclosing range of the back bracket, hiding the push-back mechanism as a whole in the seat, effectively preventing pinching hands, and the overall design is relatively beautiful, optimizing the design of the seat. Although the above scheme has improvements, it still uses the gas spring as the power source for the backrest adjustment. This not only may be limited by the service life and maintenance problems of the gas spring, but also has certain functional limitations. In particular, its gas spring locking mechanism tends to adopt a relatively complex mechanical structure, and such a design may not be simple and fast enough in actual operation, making it difficult for users to quickly and accurately adjust and fix the backrest to the ideal position, thus affecting the convenience and comfort of seat use. Content of the Utility Model

[0004] The purpose of the utility model is to provide a seat back chasing structure to solve the problems raised in the above background technique, that is, most current push-back seats rely on gas springs as the power source for backrest adjustment, with short service life, difficult maintenance, and inconvenient operation. In particular, the complex mechanical locking mechanism affects the convenience and accuracy of backrest adjustment, reducing the comfort and efficiency of user experience.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A seat back chasing structure, including a seat frame and a back bracket. The bottom of the seat frame is symmetrically provided with support frames. The front ends of the support frames are respectively connected to both sides of the bottom end of the back bracket. The bottom of the seat frame is connected to the support frames through a plurality of movable rods. And symmetrically connected with a linkage shaft between the front end of the seat frame and the bottom end of the back bracket through a coupling shaft. A transverse shaft is provided between the front ends of the support frames. Both sides of the outside of the transverse shaft are sleeved with spiral springs. A linkage member is commonly connected between the spiral springs. And a cylinder for pneumatically locking the angular position of the back bracket is provided between the front ends of the support frames.

[0006] Preferably, a linkage seat is provided on the outside of the back bracket, and the output end of the cylinder is connected to the inner side of the bottom end of the linkage seat.

[0007] Preferably, the support frames are connected by a plurality of support shafts, and the rear end of the air cylinder is movably sleeved outside the middle of one of the support shafts.

[0008] Preferably, a rotating shaft is connected between the front ends of the support frames, and both sides of the bottom of the back support are movably sleeved outside the rotating shaft.

[0009] Preferably, there are two groups of the movable rods, and the tops of the movable rods are respectively movably connected to the four corners of the bottom of the seat frame, and the bottoms of the movable rods are respectively movably connected to the outside of the support frame and form a movable connection with the support frame.

[0010] Preferably, the linkage member is in a "U" shape, and the upper end of the linkage member is in pressing contact with the inner side of the back support.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: The seat backrest following structure of the present utility model uses a high-performance helical spring to replace the gas spring, and combines an innovative pneumatic locking structure, enabling users to quickly and accurately adjust and fix the backrest to an ideal position, improving the convenience and comfort of seat use. The seat backrest following structure is based on two support frames, combined with movable rods, connecting shafts and linkage shafts, ensuring that the backrest can smoothly follow the back movements of users. It uses a high-performance helical spring to replace the traditional gas spring, works in coordination with the linkage member, provides personalized and sensitive backrest following support for different users. At the same time, the integrated air cylinder pneumatic locking mechanism allows users to easily and quickly lock or adjust the backrest angle to an ideal position, which is more efficient and stable than traditional mechanical locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of a seat backrest following structure of the present utility model;

[0013] Figure 2 is a top view structural diagram of a seat backrest following structure of the present utility model;

[0014] Figure 3 is a side view structural diagram of a seat backrest following structure of the present utility model;

[0015] Figure 4 is a schematic diagram of the inner side structure of the upper end of the back support of a seat backrest following structure of the present utility model.

[0016] In the figure: 1, seat frame; 2, support frame; 3, linkage shaft; 4, back support; 5, linkage seat; 6, movable rod; 7, connecting shaft; 8, support shaft; 9, air cylinder; 10, horizontal shaft; 11, rotating shaft; 12, helical spring; 13, linkage member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0018] Please refer to Figures 1-4, the present utility model provides a technical solution: a seat following-back structure, including a seat frame 1 and a backrest support 4. The bottom of the seat frame 1 is symmetrically provided with support frames 2. The front ends of the support frames 2 are respectively connected to both sides of the bottom end of the backrest support 4. The bottom of the seat frame 1 is connected to the support frames 2 through a plurality of movable rods 6. And symmetrically connected between the front end of the seat frame 1 and the bottom end of the backrest support 4 through a coupling shaft 7 is a linkage shaft 3. The coupling shaft 7 is fixed at the front end of the seat frame 1. The rear ends of the two linkage shafts 3 are movably sleeved outside both sides of the coupling shaft 7. Between the front ends of the support frames 2 is provided a cross shaft 10. Both sides of the outside of the cross shaft 10 are sleeved with spiral springs 12. A linkage member 13 is commonly connected between the spiral springs 12. And between the front ends of the support frames 2 is provided a cylinder 9 for pneumatically locking the angular position of the backrest support 4. The seat frame 1 and the backrest support 4 of this structure constitute a seat following-back mechanical linkage structure via the support frames 2, movable rods 6, coupling shaft 7 and linkage shaft 3, ensuring the natural following of the backrest with the movement of the user's back. Among them, the outside of the cross shaft 10 at the front end of the support frame 2 cooperates with the linkage member 13 through the assembly of the spiral spring 12, serving as the power source for the seat following-back, that is, using the elastic restoring force and durability of the high-performance spiral spring 12, it can make a sensitive response to different body shapes and sitting postures, provide just the right support force, and abandon the traditional gas spring as the power source for backrest adjustment. This design has good elastic characteristics and can smoothly adjust the tilt angle of the backrest according to the subtle changes in the user's back pressure to achieve "following the back with the body", enhancing the comfort and support of the seat. At the same time, the cylinder 9 integrated at the front end of the support frame 2 constitutes an innovative pneumatic locking mechanism, that is, when the user adjusts the backrest to the ideal position, the valve is started through the controller to inflate the cylinder 9, and the backrest support 4 is fixed using the gas pressure to achieve the instant positioning and locking of the backrest. On the contrary, when unlocking, only the gas in the cylinder 9 needs to be released, and the backrest angle can be easily adjusted. This pneumatic locking method is faster, smoother than the traditional mechanical locking, and has a simple operation without complex operations, ensuring both safety and improving the convenience and speed of adjustment. On the outside of the backrest support 4 is provided a linkage seat 5. The inner side of the top end of the linkage seat 5 is welded and fixed at the bottom outer side of the backrest support 4. And the output end of the cylinder 9 is connected to the inner side of the bottom end of the linkage seat 5 through a hinge. In this structure, when the cylinder 9 works according to the user's adjustment requirements, the change in the internal gas pressure drives the output end of the cylinder 9 to move along the hinge, and then pulls the linkage seat 5 to achieve precise control of the angle of the backrest support 4. This linkage process not only ensures the flexibility and smoothness of the backrest adjustment, but also relies on the stability of the hinge connection, enabling the backrest to quickly respond and maintain the preset position under the action of the pneumatic locking mechanism in both the locked and unlocked states. The support frames 2 are connected through a plurality of support shafts 8. And the rear end of the cylinder 9 is movably sleeved outside the middle of one of the support shafts 8. The support shaft 8 of this structure not only strengthens the stability of the overall frame, but also plays a role in connection and conduction. When the cylinder 9 inflates or exhausts gas for backrest locking and unlocking operations,Its dynamic changes can be directly transmitted to the entire support structure through the support shaft 8, achieving uniform distribution and efficient conversion of force. A rotating shaft 11 is connected between the front ends of the support frames 2, and the two sides of the bottom of the back support 4 are movably sleeved outside the rotating shaft 11. In this structure, when the user's back applies pressure to the backrest or changes the sitting posture, the rotating shaft 11 serves as a fulcrum, linking the mechanical linkage system composed of the seat frame 1, the movable rod 6, the coupling shaft 7, and the linkage shaft 3, cooperating with the dynamic support force provided by the spiral spring 12 and the pneumatic locking mechanism of the air cylinder 9 to jointly achieve smooth adjustment and instant locking of the backrest. In this way, the rotating shaft 11 not only ensures the flexibility and stability of the swing of the back support 4 but also promotes the smooth interaction of all components in the entire back-tracking structure. There are two groups of movable rods 6, and the tops of the movable rods 6 are respectively movably connected to the four corners of the bottom of the seat frame 1 through hinges, and the bottoms of the movable rods 6 are respectively movably connected to the outside of the support frame 2 through hinges and form a movable connection with the support frame 2. In this structure, when the user adjusts the sitting posture or the backrest tilts backward, the movable rod 6 serves as a key transmission element and can synchronously transmit force and motion, that is, receive pressure changes from the bottom of the seat frame 1 and smoothly guide them to the support frame 2 through the rotational dynamics of the hinges, prompting the entire backrest structure to adapt to the user's back movements. The linkage 13 is in a "U" shape, and the upper end of the linkage 13 is in pressing contact with the inner side of the back support 4. In this structure, when the user's back applies pressure or changes the posture to the back support 4, the linkage 13, as a linkage component, can instantly sense the changes in the back movements and effectively convert these tiny changes into mechanical kinetic energy. And through the close contact of the "U" shape structure, the linkage 13 ensures the continuity and accuracy of force transmission, enabling the spiral spring 12 to make corresponding adjustments accordingly and provide a more effective back-tracking support force.

[0019] Working principle: When using this seat back-tracking structure, first, after the user sits down, the pressure exerted by the user's back on the back support 4 is first transmitted to the linkage seat 5. The air cylinder 9 inflates or exhausts according to the controller's instructions to achieve locking and unlocking of the backrest. At the same time, this pressure is also transmitted through the linkage 13 (in a "U" shape) inside the back support 4. The linkage 13 presses against the inner side of the back support 4, causing the spiral spring 12 to compress or stretch accordingly, providing adaptive support. And after being driven by the linkage 13, the spiral spring 12 uses its elastic restoring force and durability to smoothly adjust the tilt angle of the backrest according to the change in back pressure, achieving the back-tracking effect. At the same time, the two groups of movable rods 6 can dynamically move between the seat frame 1 and the support frame 2 in real time to ensure the smooth transmission of force from the seat frame 1 to the bottom support. The rotating shaft 11 cooperates with other components between the front ends of the support frames 2 and the bottom of the back support 4 to enable the backrest to swing flexibly and maintain stability, thus completing a series of operations.

[0020] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A seat back structure, comprising a seat frame (1) and a back support (4), characterized in that: A support frame (2) is symmetrically arranged at the bottom of the seat frame (1), and the front end of the support frame (2) is respectively connected to the two sides of the bottom end of the back support (4), the bottom of the seat frame (1) is connected to the support frame (2) through a plurality of movable rods (6), and the front end of the seat frame (1) is symmetrically connected to the bottom end of the back support (4) through a connecting shaft (7) with a linkage shaft (3), a transverse axis (10) is arranged between the front ends of the support frames (2), and both sides of the outside of the transverse axis (10) are sleeved with coil springs (12), and a linkage member (13) is commonly connected between the coil springs (12), and a cylinder (9) for pneumatically locking the angular position of the back support (4) is arranged between the front ends of the support frames (2).

2. The seat back structure according to claim 1, characterized in that: A linkage seat (5) is provided on the outer side of the back support (4), and the output end of the cylinder (9) is connected to the inner side of the bottom end of the linkage seat (5).

3. The seat back structure according to claim 1, characterized in that: The support frames (2) are connected to each other via a plurality of support shafts (8), and the rear end of the cylinder (9) is movably sleeved outside the middle of one of the support shafts (8).

4. The seat back structure according to claim 1, characterized in that: A rotating shaft (11) is connected between the front ends of the support frame (2), and two sides of the bottom of the back support (4) are movably sleeved outside the rotating shaft (11).

5. The seat back structure according to claim 1, characterized in that: The movable rods (6) are provided with two groups in total, and the top ends of the movable rods (6) are movably connected to the four corners of the bottom of the seat frame (1), and the bottom ends of the movable rods (6) are movably connected to the outer sides of the support frame (2) and form a movably connected relationship with the support frame (2).

6. The seat back structure according to claim 1, characterized in that: The linkage member (13) is a "U"-shaped structure, and the upper end of the linkage member (13) is in pressing contact with the inner side of the back support (4).

Images