Electric folding headrest with self-locking function

Abstract

The application relates to the field of seat accessories, and discloses a power-driven folding headrest with a self-locking function. An unlocking assembly comprises a connecting sliding block and an unlocking rod. The fixed end of an unlocking motor is connected with a cover, and the output end is connected with the connecting sliding block. The unlocking rod is in transmission connection with the connecting sliding block. The unlocking rod is in transmission connection with a self-locking ratchet and a locking ratchet. The locking ratchet is provided with an abutting groove. The self-locking ratchet is provided with an abutting protrusion matched with the abutting groove. A connecting assembly comprises a fixed ratchet, a rotary torsional spring and a supporting rod. The locking ratchet is in shape matching with the fixed ratchet. The fixed ratchet is fixedly sleeved on the outer wall of the supporting rod. The rotary torsional spring is sleeved on the outer wall of the supporting rod. One end of the rotary torsional spring is connected with the cover, and the other end is connected with the fixed ratchet. The supporting rod is fixedly connected with a headrest rod. The application realizes the function of power-driven control of the folding headrest, is beneficial to driving safety, and because the headrest has the self-locking function, the locking strength is enhanced, and the safety of passengers is improved.

Description

Technical Field

[0001] This invention relates to the field of seat accessories, and in particular to electric headrest structures. Background Technology

[0002] Because the headrests of the rear seats often obstruct the driver's view of the road behind through the rearview mirror while the vehicle is in motion, and the linkage unlocking mechanisms currently available in the market still have problems such as complex structure, simple unlocking mechanism, relatively many parts, and difficulty in installation and assembly, the manufacturing cost of the headrests has also increased. Moreover, most headrests are unlocked manually, which makes it inconvenient for the driver to unlock the rear seat headrests if there is only one person in the car.

[0003] The technical problem to be solved by this application is: how to design a headrest that can realize electric flip-folding function and has a simple structure and is safe and reliable. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an electric folding headrest with a self-locking function.

[0005] The technical solution adopted in this invention is as follows: an electric folding headrest with self-locking function, including a cover, a headrest rod, and an unlocking motor, an unlocking component, a self-locking ratchet, a locking ratchet, and a connecting component disposed within the cover. The unlocking component includes a connecting slider and an unlocking rod. The fixed end of the unlocking motor is connected to the cover, and the output end is connected to the connecting slider. The unlocking rod is drivenly connected to the connecting slider and the unlocking rod is drivenly connected to the self-locking ratchet and the locking ratchet. The locking ratchet has an abutting groove, and the self-locking ratchet has an abutting protrusion that cooperates with the abutting groove. The connecting component includes a fixed ratchet, a rotary torsion spring, and a support rod. The locking ratchet and the fixed ratchet are shaped to fit together. The fixed ratchet is fixedly sleeved on the outer wall of the support rod, and the rotary torsion spring is sleeved on the outer wall of the support rod. One end of the rotary torsion spring is connected to the cover, and the other end is connected to the fixed ratchet. The support rod is fixedly connected to the headrest rod.

[0006] The unlocking motor operates, and through the transmission connection between the connecting slider and the unlocking rod, the self-locking ratchet and the locking ratchet rotate. Only when the self-locking ratchet disengages from the locking ratchet and the locking ratchet disengages from the fixed ratchet can the cover fold and flip due to the elastic force of the rotational torsion spring. Because the fixed and locking ratchets are shaped to fit each other, the locking ratchet is locked by the fixed ratchet. To further prevent the locking ratchet from rotating when the cover is in use, the self-locking ratchet locks the locking ratchet.

[0007] In some embodiments, the connecting slider has a connecting inclined surface, the unlocking rod has an unlocking inclined surface that abuts against the connecting inclined surface, and the cover has a connecting groove and an unlocking groove communicating with the connecting groove. The connecting slider slides within the connecting groove, and the unlocking rod slides within the unlocking groove. When the connecting slider slides within the connecting groove, the unlocking groove moves along the connecting inclined surface within the connecting groove because the connecting inclined surface abuts against the unlocking inclined surface.

[0008] In some embodiments, the device includes a self-locking cam that rotates coaxially with the self-locking ratchet and a locking cam that rotates coaxially with the locking ratchet. The unlocking rod is provided with a self-locking groove and a locking groove. The self-locking cam abuts against the wall of the self-locking groove, and the locking cam abuts against the wall of the locking groove. When the unlocking rod is driven by the connecting slider, the self-locking cam rotates before the locking cam, which can ensure that the locking ratchet can only rotate after the self-locking ratchet is released from its connection with the locking ratchet.

[0009] In some embodiments, the self-locking cam and the locking cam are respectively located on opposite sides of the unlocking lever, and the self-locking ratchet and the locking ratchet rotate in different directions.

[0010] In some embodiments, the headrest rod has a supporting bend, and both ends of the supporting rod have flat-ended tubes with arc-shaped grooves. The outer wall of the supporting bend matches the shape of the arc-shaped grooves, and the supporting bend and the flat-ended tubes are fixedly connected. The flat-ended tubes provide support and fixation for the supporting bend.

[0011] In some embodiments, a locking assembly is included, comprising a locking connecting shaft and a locking torsion spring. A locking ratchet and a locking cam are fixedly sleeved on the outer wall of the locking connecting shaft, and the locking torsion spring is sleeved on the outer wall of the locking connecting shaft. One end of the locking torsion spring is connected to a cover, and the other end is connected to the locking ratchet. The locking ratchet is reset due to the elastic force of the locking torsion spring.

[0012] In some embodiments, a self-locking assembly is included. This assembly comprises a self-locking connecting shaft and a self-locking torsion spring. A self-locking ratchet and a self-locking cam are fixedly sleeved on the outer wall of the self-locking connecting shaft. The self-locking torsion spring is also sleeved on the outer wall of the self-locking connecting shaft. The self-locking connecting shaft rotates at its upper limit on the fixing member. One end of the self-locking torsion spring is fixedly connected to a cover, and the other end is connected to the self-locking ratchet. The self-locking ratchet is reset due to the elastic force of the self-locking torsion spring.

[0013] In some embodiments, a connecting spring and an unlocking spring are included. One end of the connecting spring is connected to the connecting slider, and the other end is connected to the inner wall of the connecting groove. One end of the unlocking spring is connected to the unlocking rod, and the other end is connected to the inner wall of the unlocking groove. The connecting slider is reset due to the elastic force of the connecting spring, and the unlocking rod is reset due to the elastic force of the unlocking spring.

[0014] The beneficial effects of this invention are as follows:

[0015] This electric folding headrest with self-locking function, through its simple structure and self-locking folding mechanism, enables the driver to electrically control the folding of the headrest without stopping the vehicle, which is beneficial to driving safety. Because the headrest has a self-locking function, the locking strength is enhanced, improving passenger safety and further enhancing the product's competitiveness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the cover;

[0017] Figure 2 This is a schematic cross-sectional view of the internal structure of the cover;

[0018] Figure 3 This is a side view of the overall structure along the A-A' direction;

[0019] Figure 4 This is a schematic cross-sectional view of the internal structure of the cover along the A-A' direction;

[0020] Figure 5 This is a schematic cross-sectional view of the internal structure of the cover along the A-A' direction;

[0021] Figure 6 This is a schematic diagram of the connection structure of the components inside the cover.

[0022] The labels and names in the diagram correspond as follows: 1. Cover; 2. Headrest rod; 3. Unlocking motor; 4. Unlocking assembly; 5. Self-locking assembly; 6. Locking assembly; 7. Connecting assembly; 11. Fixing component; 12. Connecting groove; 13. Unlocking groove; 21. Support bend; 41. Connecting slider; 42. Unlocking rod; 43. Connecting spring; 44. Unlocking spring; 51. Self-locking ratchet; 52. Self-locking connecting shaft; 53. Self-locking cam; 54. Self-locking torsion bar. 61. Spring; 62. Locking connecting shaft; 63. Locking ratchet; 64. Locking cam; 71. Locking torsion spring; 72. Support rod; 73. Fixed ratchet; 74. Rotary torsion spring; 75. Flat-head tube; 111. Limiting block; 411. Connecting inclined surface; 421. Unlocking inclined surface; 422. Self-locking groove; 423. Locking groove; 511. Abutting protrusion; 621. Abutting groove; 622. Fixed tooth; 721. Fixed groove; 722. Limiting part. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1 This invention provides a technical solution: an electric folding headrest with a self-locking function, comprising a cover 1, a headrest rod 2, an unlocking motor 3, an unlocking component 4, a self-locking component 5, a locking component 6, and a connecting component 7. The unlocking motor 3, unlocking component 4, self-locking component 5, locking component 6, and connecting component 7 are all disposed within the cover 1. The headrest rod 2 has a supporting curved tube 21 connected to the cover 1. The cover 1 has several slots for placing the various components. The fixed end of the unlocking motor 3 is fixedly connected to the cover 1.

[0025] Please see Figure 1 and Figure 2 The unlocking component 4 includes a connecting slider 41, an unlocking rod 42, a connecting spring 43, and an unlocking spring 44. The connecting slider 41 is connected to the unlocking rod 42. The connecting slider 41 has a connecting inclined surface 411, and the unlocking rod 42 has an unlocking inclined surface 421 that abuts against the connecting inclined surface 411. The cover 1 has a connecting groove 12 and an unlocking groove 13 that communicates with the connecting groove 12. The connecting slider 41 and the unlocking rod 42 are normally arranged to each other. The connecting slider 41 slides within the connecting groove 12. One end of the connecting slider 41 is fixedly connected to the output end of the unlocking motor 3, and the other end is connected to the connecting spring 43. One end of the connecting spring 43 is connected to the connecting slider 41, and the other end is connected to the inner wall of the connecting groove 12. The unlocking rod 42 slides within the unlocking groove 13. One end of the unlocking spring 44 is connected to the unlocking rod 42, and the other end is connected to the inner wall of the unlocking groove 13. Therefore, the connecting groove 12 and the unlocking groove 13 are connected to each other and are normally arranged to each other. The unlocking lever 42 is also provided with a self-locking groove 422 and a locking groove 423, which are arranged along the moving direction of the unlocking lever 42. When the unlocking motor 3 is activated, the connecting slider 41 moves to the end away from the unlocking motor 3. Due to the contact between the connecting inclined surface and the unlocking inclined surface 421, the unlocking lever 42 moves upward.

[0026] Please see Figures 1-5The cover 1 includes a fixing member 11 fixedly installed inside the cover 1. The self-locking assembly 5 includes a self-locking ratchet 51, a self-locking connecting shaft 52, a self-locking cam 53, and a self-locking torsion spring 54. The self-locking connecting shaft 52 rotates at the upper limit of the fixing member 11. The self-locking ratchet 51 and the self-locking cam 53 are fixedly sleeved on the outer wall of the self-locking connecting shaft 52. The self-locking torsion spring 54 is sleeved on the outer wall of the self-locking connecting shaft 52. The self-locking connecting shaft 52 rotates at the upper limit of the fixing member 11. One end of the self-locking torsion spring 54 is fixedly connected to the fixing member 11, and the other end is connected to the self-locking ratchet 51. The unlocking rod 42 is connected to the self-locking ratchet 51 in a transmission connection. The self-locking cam 53 is provided with a self-locking protrusion provided in the self-locking groove 422. When the unlocking rod 42 moves upward, the self-locking protrusion abuts against the groove wall of the self-locking groove 422 below the self-locking protrusion and is thus moved by the self-locking groove 422, which ultimately drives the self-locking connecting shaft 52 to rotate clockwise in the A-A' direction. The self-locking torsion spring 54 has the function of driving the self-locking connecting shaft 52 to rotate counterclockwise in the A-A' direction.

[0027] Please see Figures 1-5The locking assembly 6 includes a locking connecting shaft 61, a locking ratchet 62, a locking cam 63, and a locking torsion spring 64. The locking connecting shaft 61 rotates at its upper limit on the fixing member 11. The locking ratchet 62 and the locking cam 63 are fixedly sleeved on the outer wall of the locking connecting shaft 61. The locking torsion spring 64 is sleeved on the outer wall of the locking connecting shaft 61. One end of the locking torsion spring 64 is fixedly connected to the fixing member 11, and the other end is connected to the locking ratchet 62. The unlocking rod 42 is drivenly connected to the locking ratchet 62. The locking cam 63 has a locking protrusion set in the locking groove 423. The groove wall of the locking groove 423 below the locking cam 63 has a sliding plane and a sliding slope that are connected to each other. The sliding slope is closer to the locking cam 63. During the upward movement of the unlocking lever 42, the locking cam 63 abuts against the wall of the locking groove 423 located below it, thus being driven by the locking groove 423 to move. Furthermore, the self-locking cam 53 and the locking cam 63 are respectively positioned on opposite sides of the unlocking lever 42, ultimately causing the locking connecting shaft 61 to rotate counterclockwise in the A-A' direction. Because the locking cam 63 abuts against the wall of the locking groove 423 in the order of sliding the plane first and then the inclined plane, the locking cam 63 remains unchanged after rotating a certain angle. Moreover, when the unlocking lever 42 moves upward, the self-locking cam 53 rotates before the locking cam 63, because the distance between the self-locking protrusion and the wall of the self-locking groove 422 is less than the distance between the locking protrusion and the wall of the locking groove 423. The locking torsion spring 64 has the function of driving the locking connecting shaft 61 to rotate clockwise in the A-A' direction. The headrest is in contact with the surfaces of the self-locking ratchet 51 and the locking ratchet 62. The surface of the locking ratchet 62 is provided with an abutment groove 621, and the surface of the self-locking ratchet 51 is provided with an abutment protrusion 511 that matches the shape of the abutment groove 621. The self-locking ratchet 51 and the locking ratchet 62 abut against each other through the abutment protrusion 511 and the abutment groove 621, thereby achieving the function of locking the position of the locking ratchet 62 by the self-locking ratchet 51.

[0028] Please see Figures 1-2The connecting assembly 7 includes a support rod 71, a fixed ratchet 72, a rotary torsion spring 73, and a flat-headed tube 74. Flat-headed tubes 74 are fixedly installed at both ends of the support rod 71, and are located at the bottom of the support bend 21. The flat-headed tubes 74 have arc-shaped grooves, and the outer wall of the support bend 21 matches the shape of the arc-shaped grooves. The support bend 21 and the flat-headed tubes 74 are fixedly connected by welding. The support bend 21 serves to support the cover 1. The fixed ratchet 72 is fixedly sleeved on the outer wall of the support rod 71, and the rotary torsion spring 73 is sleeved on the outer wall of the support rod 71. One end of the rotary torsion spring 73 is connected to the fixing member 11, and the other end is connected to the fixed ratchet 72. The rotary torsion spring 73 has the function of driving the fixing member 11 to rotate counterclockwise in the A-A' direction. The fixing ratchet 72 has a fixing groove, and the locking ratchet 62 has a fixing tooth 622 that matches the shape of the fixing groove. When the fixing tooth 622 is in the fixing groove, the locking ratchet 62 is locked on the fixing ratchet 72. The fixing member 11 is sleeved on the outer wall of the support rod 71, and the fixing member 11 can rotate within the upper limit on the outer wall of the support rod 71.

[0029] Please see Figure 6 The bottom of the fixing 72 is provided with a limiting part 722, and the bottom of the fixing member 11 is provided with a limiting block 111. The fixing member 11 rotates counterclockwise on the support rod 71 until the limiting block 111 abuts against the limiting part 722.

[0030] When the present invention is in use, the fixing tooth 622 is in the fixing groove, the locking ratchet 62 is locked on the fixing ratchet 72, the abutting protrusion 511 abuts against the abutting groove 621, and the self-locking ratchet 51 locks the position of the locking ratchet 62, and the entire structure is in a self-locking state.

[0031] Unlocking Process: The unlocking motor 3 operates, pushing the connecting slider 41 to move. The unlocking lever 42 moves upward. The self-locking cam 53 rotates before the locking cam 63. The self-locking ratchet 51 rotates clockwise in the A-A' direction due to the transmission of the self-locking cam 53, disengaging the abutment protrusion 511 and the abutment groove 621. The self-locking ratchet 51 releases the locking ratchet 62. At this time, the unlocking lever 42 continues to move upward, and the locking cam 63 rotates counterclockwise in the A-A' direction. The locking ratchet 62 rotates counterclockwise due to the transmission of the locking cam 63, releasing the locking ratchet 62 from the fixed ratchet 72. Due to the elastic force of the rotating torsion spring 73, the cover 1 rotates counterclockwise in the A-A' direction, achieving a flip-fold until the fixed part 11 abuts against the fixed ratchet 72. After completion, the unlocking motor 3 resets, the connecting slider 41 resets due to the action of the connecting spring 43, and the unlocking lever 42 resets due to the action of the unlocking spring 44.

[0032] Reset process: When the cover 1 is manually pushed back to the working position, under the action of the locking torsion spring 64, the locking ratchet 62 is reset by the locking torsion spring 64 and is locked on the fixed ratchet 72. The self-locking ratchet 51 is reset by the self-locking torsion spring 54 and locks the position of the locking ratchet 62.

[0033] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electric folding headrest with a self-locking function, characterized in that, The device includes a cover (1), a headrest rod (2), and an unlocking motor (3), an unlocking assembly (4), a self-locking ratchet (51), a locking ratchet (62), and a connecting assembly (7) disposed within the cover (1). The unlocking assembly (4) includes a connecting slider (41) and an unlocking rod (42). The fixed end of the unlocking motor (3) is connected to the cover (1), and the output end is connected to the connecting slider (41). The unlocking rod (42) is drivenly connected to the connecting slider (41), and the unlocking rod (42) is drivenly connected to the self-locking ratchet (51) and the locking ratchet (62). The locking ratchet (62) is provided with an abutment groove. 621), the self-locking ratchet (51) is provided with abutting protrusion (511) that cooperates with the abutting groove (621), the connecting assembly (7) includes a fixed ratchet (72), a rotary torsion spring (73) and a support rod (71), the locking ratchet (62) is shaped to fit the fixed ratchet (72), the fixed ratchet (72) is fixedly sleeved on the outer wall of the support rod (71), the rotary torsion spring (73) is sleeved on the outer wall of the support rod (71), one end of the rotary torsion spring (73) is connected to the cover (1) and the other end is connected to the fixed ratchet (72), the support rod (71) is fixedly connected to the headrest rod (2); It also includes a self-locking cam (53) that rotates coaxially with the self-locking ratchet (51) and a locking cam (63) that rotates coaxially with the locking ratchet (62). The unlocking rod (42) is provided with a self-locking groove (422) and a locking groove (423). The self-locking cam (53) abuts against the groove wall of the self-locking groove (422), and the locking cam (63) abuts against the groove wall of the locking groove (423). When the unlocking rod (42) is driven by the connecting slider (41), the self-locking cam (53) rotates before the locking cam (63).

2. The electric folding headrest with self-locking function according to claim 1, characterized in that, The connecting slider (41) is provided with a connecting inclined surface (411), the unlocking rod (42) is provided with an unlocking inclined surface (421) that abuts against the connecting inclined surface (411), the cover (1) is provided with a connecting groove (12) and an unlocking groove (13) that communicates with the connecting groove (12), the connecting slider (41) slides within the connecting groove (12), and the unlocking rod (42) slides within the unlocking groove (13).

3. The electric folding headrest with self-locking function according to claim 1, characterized in that, The self-locking cam (53) and the locking cam (63) are respectively located on opposite sides of the unlocking rod (42), and the self-locking ratchet (51) and the locking ratchet (62) rotate in different directions.

4. The electric folding headrest with self-locking function according to claim 1, characterized in that, The headrest rod (2) is provided with a support bend (21), and the support rod (71) is provided with flat tubes (74) at both ends. The flat tubes (74) are provided with arc grooves. The outer wall of the support bend (21) matches the shape of the arc groove. The support bend (21) and the flat tubes (74) are fixedly connected.

5. An electric folding headrest with self-locking function according to claim 1, characterized in that, The device includes a locking assembly (6), which includes a locking connecting shaft (61) and a locking torsion spring (64). The locking ratchet (62) and the locking cam (63) are fixedly sleeved on the outer wall of the locking connecting shaft (61). The locking torsion spring (64) is sleeved on the outer wall of the locking connecting shaft (61). One end of the locking torsion spring (64) is connected to the cover (1), and the other end is connected to the locking ratchet (62).

6. The electric folding headrest with self-locking function according to claim 1, characterized in that, The device includes a self-locking assembly (5), which includes a self-locking connecting shaft (52) and a self-locking torsion spring (54). The self-locking ratchet (51) and the self-locking cam (53) are fixedly sleeved on the outer wall of the self-locking connecting shaft (52). The self-locking torsion spring (54) is sleeved on the outer wall of the self-locking connecting shaft (52). The self-locking connecting shaft (52) rotates at the upper limit on the fixing member (11). One end of the self-locking torsion spring (54) is fixedly connected to the cover (1), and the other end is connected to the self-locking ratchet (51).

7. An electric folding headrest with self-locking function according to claim 2, characterized in that, It includes a connecting spring (43) and an unlocking spring (44). One end of the connecting spring (43) is connected to the connecting slider (41) and the other end is connected to the inner wall of the connecting groove (12). One end of the unlocking spring (44) is connected to the unlocking rod (42) and the other end is connected to the inner wall of the unlocking groove (13).

Images