Joint adjusting device for backrest and headrest of automobile seat and automobile seat with joint adjusting device

Abstract

The utility model discloses an automobile seat backrest and headrest joint adjusting device and an automobile seat, the automobile seat is provided with a seat cushion, a backrest and a headrest, the headrest is connected with the backrest through a headrest rod, the backrest is rotatably and fixedly connected with the seat cushion through a rotating shaft, the joint adjusting device comprises an inhaul cable triggering mechanism, and the inhaul cable triggering mechanism is connected with the headrest rod. The inhaul cable triggering mechanism comprises inhaul cables connected with the headrest and the backrest respectively, and the inhaul cables are connected with the rotating shaft so that the rotating shaft can rotate to drive the inhaul cables to do linear motion. The conversion mechanism is arranged in the headrest and comprises a rotary moving shaft, and the inhaul cable is connected with the rotary moving shaft, so that the inhaul cable linearly moves to drive the rotary moving shaft to rotate and translate. Through the inhaul cable triggering mechanism and the conversion mechanism, linear motion of the inhaul cable is converted into rotary translation motion in the conversion mechanism, and joint debugging of the headrest and the backrest under the zero-pressure posture is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile seats, in particular to an automobile seat backrest and headrest joint adjustment device and an automobile seat. Background Art

[0002] With the rapid development of the automotive industry, passengers have higher and higher requirements for the comfort of car seats. The zero-pressure posture of a seat generally refers to a design that simulates the natural state of the human body in a weightless state to reduce the gravitational pressure on the body and thus provide maximum comfort.

[0003] The existing effects of achieving joint adjustment of the zero-pressure posture of the seat and the headrest basically rely on electric configuration, that is, achieving joint adjustment of the zero-pressure posture and the headrest through an electric long slide rail, a recliner and a five-link structure of a special-shaped seat cushion, but the electric configuration increases the production cost.

[0004] In order to improve the competitiveness of low-priced cars, more and more car companies are committed to achieving zero-pressure posture of seats and adjustment of headrests in the form of manual adjustment. However, the current mainstream front headrest stroke is 50mm-70mm, which does not meet the long stroke of headrest adjustment under zero-pressure state. In addition, when the seat back rotates along the axis, the backrest tilts backward, and at the same time drives the headrest to move backward continuously as the backrest tilts. At this time, without manually adjusting the headrest, this will result in the passenger in a zero-pressure posture lying on the seat with his head unable to make good contact with the headrest, and either the passenger's head will be suspended in the air or the passenger's head will be resting on the backrest. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a joint adjustment device for a car seat backrest and a headrest, wherein the car seat comprises a seat cushion, a backrest and a headrest, wherein the headrest is connected to the backrest through a headrest rod, and the backrest and the seat cushion are rotatably fixedly connected through a rotating shaft, and the joint adjustment device comprises:

[0006] A cable trigger mechanism, the cable trigger mechanism comprising cables respectively connected to the headrest and the backrest, the cables being connected to the rotating shaft so that the rotation of the rotating shaft drives the cables to perform linear motion; and

[0007] The conversion mechanism is built into the headrest, and the conversion mechanism includes a rotational movable shaft. The cable is connected to the rotational movable shaft so that the linear movement of the cable drives the rotational movable shaft to perform rotational and translational movements.

[0008] Furthermore, a rotatable turntable is provided at the connection between the backrest and the seat cushion, the rotating shaft is axially provided on the turntable, and a stopper is provided along the radially outward circumferential edge of the turntable.

[0009] Furthermore, the cable trigger mechanism further includes a cable rotating block, a cable fixing block and a stopper, wherein:

[0010] An arc-shaped rotating block is provided along the radial direction of the rotating disk and connected to the rotating shaft, and the cable rotating block is extended and provided on one radial side of the arc-shaped rotating block;

[0011] The cable fixing block is arranged on the same circumference as the cable rotating block, a protrusion is arranged along the radially outward edge of the arc-shaped rotating block, one side of the cable fixing block is connected to the cable, and when the backrest does not rotate relative to the seat cushion, the side of the cable fixing block away from the cable can contact the protrusion;

[0012] The stopper is located between the cable fixing block and the cable rotating block. When the backrest rotates more than 15 degrees relative to the seat cushion, the stopper contacts the cable rotating block to limit the freedom of the cable.

[0013] Furthermore, the headrest includes a front cover and a rear cover with matching contact surfaces, and the contact surfaces of the rear cover and the front cover are provided with sliding teeth. Under the action of the cable, the sliding teeth restrict the front cover to perform only linear lifting and lowering motion relative to the rear cover.

[0014] Furthermore, the sliding teeth are in an L-shaped structure, and the sliding teeth are symmetrically distributed about the conversion mechanism to limit the vertical and horizontal displacements of the front cover relative to the rear cover.

[0015] Furthermore, a countersunk hole is provided on the contact surface between the rear cover and the front cover, and the conversion mechanism is embedded in the countersunk hole.

[0016] Furthermore, the conversion mechanism also includes a rack, a translation axis groove is arranged adjacent to one side of the rack, both ends of the rotational movable axis pass through the translation axis groove and gears are arranged at both ends of the rotational movable axis, and the gears can rotate and translate along the rack.

[0017] Furthermore, a tension spring rotating hook is sleeved on the rotating movable shaft located between the translation shaft grooves, and a reset tension spring is connected between the tension spring rotating hook and the upper edge of the inner wall of the countersunk hole to pull the rotating movable shaft to move linearly along the translation shaft groove.

[0018] Furthermore, a concave surface is provided near the end position of the rotating movable shaft, and a rib matching the concave surface is provided at the starting position of the translation axis groove; a return torsion spring is wound around the rotating movable shaft located between the translation axis grooves so that the rotating movable shaft is subjected to force to rotate and fix at the starting position of the translation axis groove.

[0019] A car seat comprises the car seat back and headrest joint adjustment device.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model converts the linear motion of the cable into a rotational translation motion in the conversion mechanism through a cable trigger mechanism and a conversion mechanism, thereby realizing the joint adjustment of the headrest and the backrest in a zero-pressure posture to adapt to the head position of the passenger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure disclosed in the embodiment of the utility model, showing a state diagram when the headrest and the backrest are not adjusted together;

[0023] Figure 2 It is a schematic diagram of the overall structure disclosed in the embodiment of the utility model, showing the state diagram of the headrest and the backrest when they are adjusted together;

[0024] Figure 3 It is a partial structural schematic diagram of the embodiment of the utility model, showing the state diagram of the cable trigger mechanism when the backrest is not rotated relative to the seat cushion;

[0025] Figure 4 It is a partial structural schematic diagram of the embodiment of the utility model, showing the state diagram of the cable trigger mechanism when the backrest rotates relative to the seat cushion;

[0026] Figure 5 It is a partial structural schematic diagram of the embodiment of the utility model, showing a schematic diagram of the back cover of the headrest;

[0027] Figure 6 It is a partial structural schematic diagram disclosed in an embodiment of the utility model, showing a state diagram of the headrest when the headrest and the backrest are not adjusted together;

[0028] Figure 7 It is a partial structural schematic diagram disclosed in the embodiment of the utility model, showing the state diagram of the headrest when the headrest and the backrest are adjusted in conjunction;

[0029] Figure 8 It is a partial structural schematic diagram disclosed in an embodiment of the utility model, showing the state of the headrest when the headrest and the backrest are adjusted in place;

[0030] Fig. 9 It is a partial structural schematic diagram disclosed in the embodiment of the utility model, showing a structural schematic diagram of the translation axis slot;

[0031] Fig.10 It is a partial structural schematic diagram disclosed in an embodiment of the utility model, showing a structural schematic diagram of a reset torsion spring.

[0032] In the figure:

[0033] 100. Cushion;

[0034] 200, backrest;

[0035] 210, cable trigger mechanism, 211, cable; 212, cable rotating block; 213, cable fixing block; 214, stopper;

[0036] 215, rotating shaft; 216, rotating disk; 217, arc-shaped rotating block; 218, convex block;

[0037] 300, headrest;

[0038] 301, headrest rod; 302, front cover; 303, rear cover; 304, countersunk hole; 305, sliding tooth;

[0039] 310. conversion mechanism; 311. rotational movement axis; 312. translation axis slot; 313. rack; 314. gear; 315. tension spring rotation hook; 316. reset tension spring; 317. reset torsion spring. DETAILED DESCRIPTION

[0040] In order to make the technical scheme and technical effect of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments.

[0041] like Figure 1-2 As shown, the utility model aims to provide a joint adjustment device for a car seat backrest and a headrest, which is used to realize the joint adjustment of the headrest and the backrest in a zero-pressure posture to adapt to the head position of the passenger. The car seat has a seat cushion 100, a backrest 200 and a headrest 300, wherein the headrest 300 is connected to the backrest 200 through a headrest rod 301, and the backrest 200 and the seat cushion 100 are rotatably fixedly connected through a rotating shaft 215. The joint adjustment device mainly includes a cable trigger mechanism 210 and a conversion mechanism 310 built into the headrest 300. Among them, the cable trigger mechanism 210 includes a cable 211 respectively connected to the headrest 300 and the backrest 200, and the cable 211 is connected to the rotating shaft 215 so that the rotating shaft 215 rotates and drives the cable 211 to perform linear motion; the conversion mechanism 310 includes a rotating movable shaft 311, and the cable 211 is connected to the rotating movable shaft 311 so that the linear motion of the cable 211 drives the rotating movable shaft 311 to rotate and translate.

[0042] Regarding the cable trigger mechanism 210: Figure 3-4As shown, a rotatable turntable 216 is provided at the connection between the backrest 200 and the seat cushion 100, and a rotating shaft 215 is axially provided on the turntable 216. The turntable 216 and the rotating shaft 215 are conventionally provided for seats to realize the rotation adjustment of the backrest 200 relative to the seat cushion 100. The cable trigger mechanism 210 also includes a cable rotating block 212, a cable fixing block 213 and a stopper 214. Among them, an arc-shaped rotating block 217 is provided along the radial direction of the turntable 216 and connected to the rotating shaft 215, and a cable rotating block 212 is extended from the radial side edge of the arc-shaped rotating block 217; the cable fixing block 213 and the cable rotating block 212 are arranged on the same circumference; a stopper 214 is provided along the radially outward circumferential edge of the turntable 216, and the stopper 214 is located between the cable fixing block 213 and the cable rotating block 212. A protrusion 218 is provided along the radially outward edge of the arc-shaped rotating block 217. A cable 211 is connected to one side of the cable fixing block 213. When the backrest 200 does not rotate relative to the cushion 100, the side of the cable fixing block 213 away from the cable 211 can contact the protrusion 218. When the backrest 200 rotates within 15° relative to the cushion 100, the cable 211 is in a relaxed state, and the block 214 does not limit the movement of the cable 211; when the backrest 200 rotates more than 15° relative to the cushion 100, the block 214 contacts the cable rotating block 212 to limit the freedom of the cable 211, that is, to drive the cable 211 to lengthen, while the length of the cable 211 itself is fixed, and at this time the cable 211 will drive the rotating movable shaft 311 to rotate and translate.

[0043] Regarding the conversion mechanism 310: Figure 5-8 As shown, the headrest 300 includes a front cover 302 and a rear cover 303 whose contact surfaces match each other. The contact surfaces of the rear cover 303 and the front cover 302 are provided with sliding teeth 305. Under the action of the cable 211, the sliding teeth 305 restrict the front cover 302 to only perform linear lifting and lowering motion relative to the rear cover 303. Preferably, the sliding teeth 305 are L-shaped, and the sliding teeth 305 are symmetrically distributed about the conversion mechanism 310 to restrict the vertical displacement and horizontal displacement of the front cover 302 relative to the rear cover 303, wherein two groups of sliding teeth 305 with openings facing each other are used to restrict the vertical displacement of the front cover 302 relative to the rear cover 303, and a group of sliding teeth 305 with openings facing each other are used to restrict the horizontal displacement of the front cover 302 relative to the rear cover 303. The contact surface of the rear cover 303 and the front cover 302 is provided with a countersunk hole 304, and the conversion mechanism 310 is embedded in the countersunk hole 304. The conversion mechanism 310 also includes a rack 313, a translation axis slot 312 is provided adjacent to one side of the rack 313, both ends of the rotation axis 311 pass through the translation axis slot 312, and both ends of the rotation axis 311 are provided with gears 314, and the gears 314 can rotate and translate along the rack 313. Fig. 9As shown, the rotational movable shaft 311 is provided with a concave surface near the end position, and the starting position of the translational shaft groove 312 is provided with a rib that matches the concave surface. A tension spring rotating hook 315 is sleeved on the rotational movable shaft 311 located between the translational shaft grooves 312, and a reset tension spring 316 is connected between the tension spring rotating hook 315 and the upper edge of the inner wall of the countersunk hole 304. The reset tension spring 316 is used to pull the rotational movable shaft 311 to move linearly along the translational shaft groove 312 when the headrest 300 is reset. Fig.10 As shown, a return torsion spring 317 is wound around the rotational movable shaft 311 located between the translational shaft slots 312 . The function of the return torsion spring 317 is to rotate and fix the rotational movable shaft 311 at the starting position of the translational shaft slots 312 .

[0044] The structural principle of the utility model is: when the car seat back 200 and the headrest 300 are in the starting position, the angle between the backrest 200 and the cushion 100 is set, and the cable 211 is in a relaxed state; when the angle of the seat back 200 relative to the cushion 100 is adjusted, within the rotation range of the backrest 200 within 15°, the block 214 will not limit the cable 211, so the headrest 300 remains stationary during the rotation of the backrest 200 within 15°; when the backrest 200 rotates more than 15°, the block 214 begins to intervene to limit the freedom of the cable 211. At this time, continuing to rotate the backrest angle will cause the cable 211 to begin to be stretched by force. As the length of the fixed cable is extended, the conversion mechanism 310 will be driven to rotate and translate, that is, the gear 314 rotates and translates along the rack 313, so that the front cover 302 of the headrest 300 moves up and down along the sliding teeth 305. The full stroke only requires the backrest 200 to rotate to drive the headrest 100 to move up and down, thereby achieving the coordinated adjustment of the headrest 100 and the backrest 200.

[0045] It should be noted that the automobile seat including the automobile seat backrest and headrest joint adjustment device also falls within the protection scope of the present utility model.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle seat backrest and headrest joint adjustment device, the vehicle seat comprising a seat cushion (100), a backrest (200) and a headrest (300), the headrest (300) being connected to the backrest (200) via a headrest rod (301), the backrest (200) being rotatably fixedly connected to the seat cushion (100) via a rotating shaft (215), characterized in that: The joint adjustment device comprises: A cable trigger mechanism (210), the cable trigger mechanism (210) comprising a cable (211) respectively connected to the headrest (300) and the backrest (200), the cable (211) being connected to the rotating shaft (215) so that the rotating shaft (215) rotates to drive the cable (211) to perform linear motion; and A conversion mechanism (310) is built into the headrest (300), wherein the conversion mechanism (310) comprises a rotationally movable shaft (311), and the cable (211) is connected to the rotationally movable shaft (311) so that the linear movement of the cable (211) drives the rotationally movable shaft (311) to perform a rotational and translational movement.

2. The automobile seat back and headrest joint adjustment device according to claim 1, characterized in that: A rotatable turntable (216) is provided at the connection between the backrest (200) and the seat cushion (100), the turntable (216) is axially provided with the rotating shaft (215), and a stopper (214) is provided along the radially outward circumferential edge of the turntable (216).

3. The vehicle seat back and headrest joint adjustment device according to claim 2, characterized in that: The cable trigger mechanism (210) further comprises a cable rotating block (212) and a cable fixing block (213), wherein: An arc-shaped rotating block (217) is provided radially along the rotating disk (216) and connected to the rotating shaft (215), and the cable rotating block (212) is extendedly provided on one radial side of the arc-shaped rotating block (217); The cable fixing block (213) is arranged on the same circumference as the cable rotating block (212), and a protrusion (218) is provided along the radially outward edge of the arc-shaped rotating block (217); one side of the cable fixing block (213) is connected to the cable (211); when the backrest (200) does not rotate relative to the seat cushion (100), the side of the cable fixing block (213) away from the cable (211) can contact the protrusion (218); The stopper (214) is located between the cable fixing block (213) and the cable rotating block (212); when the backrest (200) rotates more than 15 degrees relative to the seat cushion (100), the stopper contacts the cable rotating block (212) to limit the degree of freedom of the cable (211).

4. The automobile seat back and headrest joint adjustment device according to claim 1, characterized in that: The headrest (300) comprises a front cover (302) and a rear cover (303) whose contact surfaces match each other. The contact surfaces of the rear cover (303) and the front cover (302) are provided with sliding teeth (305). Under the action of the cable (211), the sliding teeth (305) restrict the front cover (302) to perform only linear lifting and lowering motion relative to the rear cover (303).

5. The vehicle seat back and headrest joint adjustment device according to claim 4, characterized in that: The sliding teeth (305) are in an L-shaped structure, and the sliding teeth (305) are symmetrically distributed with respect to the conversion mechanism (310) to limit the vertical displacement and horizontal displacement of the front cover (302) relative to the rear cover (303).

6. The automobile seat back and headrest joint adjustment device according to claim 4, characterized in that: A countersunk hole (304) is provided on the contact surface between the rear cover (303) and the front cover (302), and the conversion mechanism (310) is embedded in the countersunk hole (304).

7. The vehicle seat back and headrest joint adjustment device according to claim 6, characterized in that: The conversion mechanism (310) further comprises a rack (313), a translation axis slot (312) being arranged adjacent to one side of the rack (313), both ends of the rotational movable axis (311) passing through the translation axis slot (312), and gears (314) being arranged at both ends of the rotational movable axis (311), and the gears (314) can perform rotational and translational movements along the rack (313).

8. The vehicle seat back and headrest joint adjustment device according to claim 7, characterized in that: A tension spring rotating hook (315) is sleeved on the rotating movable shaft (311) located between the translation shaft grooves (312), and a reset tension spring (316) is connected between the tension spring rotating hook (315) and the upper edge of the inner wall of the countersunk hole (304) to pull the rotating movable shaft (311) to move linearly along the translation shaft groove (312).

9. The automobile seat back and headrest joint adjustment device according to claim 7, characterized in that: The rotating movable shaft (311) is provided with a concave surface near the end position, and the starting position of the translation axis slot (312) is provided with a rib that matches the concave surface; a return torsion spring (317) is wound around the rotating movable shaft (311) located between the translation axis slots (312) so that the rotating movable shaft (311) is subjected to force to rotate and fix at the starting position of the translation axis slot (312).

10. A car seat, characterized in that: The invention comprises the automobile seat back and headrest joint adjustment device as claimed in any one of claims 1 to 9.

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