A foldable automobile headrest frame structure

Abstract

A foldable automobile headrest frame structure includes a connecting rod and a connecting frame. The connecting frame is rotatably connected to a crossbar at the bottom of the connecting rod. A locking mechanism and a connecting rod reset mechanism are provided on the connecting frame. The locking mechanism includes a rotating wheel, a direction-changing wheel, a locking block, a locking block reset mechanism, and a snap block. The snap block is fixed to the crossbar. The locking block is connected to the connecting frame and contacts the snap block. The locking block is connected to a first pull cord, which is redirected by the direction-changing wheel and connected to the rotating wheel. The rotating wheel is connected to the connecting frame. A second pull cord is wound around the rotating wheel and fixed to the rotating wheel. The second pull cord passes through the connecting frame. The distance from the connection between the first pull cord and the rotating wheel to the rotating wheel's rotational center is shorter than the distance from the connection between the second pull cord and the rotating wheel to the rotating wheel's rotational center. Advantages of this structure include: the locking mechanism occupies less space within the connecting frame, and unlocking is labor-saving.

Description

Technical Field

[0001] The invention relates to the technical field of automobile headrest manufacturing, in particular to a foldable automobile headrest frame structure. Background Art

[0002] There is an existing Chinese invention patent application with application number CN202010406507.2 and titled "A foldable headrest with a pull cord", which discloses a foldable headrest with a pull cord, including a pillow body, a connecting frame and a pillow frame. The pillow frame is arranged on the connecting frame, and the pillow body is connected to the pillow frame. A locking mechanism and a pillow frame reset mechanism are provided on the connecting frame. A transmission mechanism, a roller and a roller reset mechanism are provided on the connecting frame. The pull cord is composed of multiple wires, the lower ends of the multiple wires pass through the wire sleeves and extend out of the connecting frame, and the upper ends of the multiple wires are respectively connected to the rollers. One end of the transmission mechanism is linked to the roller, and the other end of the transmission mechanism is linked to the locking mechanism. When one end of the pull cord extending out of the connecting frame is pulled, the rope pulls the roller to rotate, and the locking mechanism unlocks the pillow frame. When there is no tension on the pull cord, the roller reset mechanism drives the roller to rotate in reverse and reset. The advantages of this method are that it avoids direct connection between the pull cord and the headrest rotation trigger structure, ensuring uniform force distribution at the connection between the pull cord and the pull cord tension transmission structure, making it less susceptible to damage and extending its service life. However, the locking mechanism used in this foldable headrest has many components, which takes up more space in the pillow frame and is inconvenient to install. Therefore, the structure of this foldable headrest needs further improvement. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a foldable automobile headrest frame structure with a simple locking mechanism, small space occupation, labor-saving unlocking, and easy use in response to the above-mentioned existing technical status.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows: the foldable car headrest frame structure comprises a connecting rod that can be connected to the car headrest and a connecting frame that can be connected to the car seat, the connecting frame and the cross bar at the bottom of the connecting rod are rotatably connected together, and a locking mechanism that can lock the connecting rod on the connecting frame and unlock the connecting rod when the pull rope is pulled, and a connecting rod reset mechanism that drives the connecting rod to reset after the connecting rod is unlocked is provided on the connecting frame, characterized in that: the locking mechanism comprises a rotating wheel, a changing wheel, a locking block, a locking block reset mechanism and a snap block, the snap block is fixed on the cross bar, one end of the locking block is rotatably connected to the connecting frame, and the other end of the locking block is rotatably connected to the connecting frame. The end touches the buckle block through the locking block reset mechanism, and the other end of the locking block is connected to one end of the first pull rope, and the other end of the first pull rope is connected to the rotating wheel after changing direction of the changing wheel. The rotating wheel can be rotatably connected to the connecting frame, and the rotating wheel can pull the locking block and the buckle block apart by the first pull rope, so that the connecting rod is driven by the connecting rod reset mechanism to be reset relative to the connecting frame. A second pull rope is wound on the rotating wheel, and one end of the second pull rope is fixed to the rotating wheel, and the other end of the second pull rope passes through the connecting frame and extends to the outside of the connecting frame. The distance from the connection between the other end of the first pull rope and the rotating wheel to the rotation center of the rotating wheel is smaller than the distance from the connection between one end of the second pull rope and the rotating wheel to the rotation center of the rotating wheel.

[0005] As an improvement, a rotating wheel reset torsion spring is concentrically sleeved on the rotating shaft of the rotating wheel, which can keep the rotating wheel pulling the first pull rope. One end of the rotating wheel reset torsion spring is connected to the connecting frame, and the other end of the rotating wheel reset torsion spring is connected to the rotating wheel.

[0006] Further improvement is that a protrusion is provided on the side wall of the connecting frame, and a connecting frame recess is provided on the inner wall of the connecting frame corresponding to the protrusion, the rotating shaft of the rotating wheel is connected to the side wall of the connecting frame recess, and the rotating wheel reset torsion spring is located between the side wall of the connecting frame recess and the side wall of the rotating wheel.

[0007] Further improvement, an auxiliary wheel body is provided on the side wall of the rotating wheel away from the rotating wheel reset torsion spring, and an annular groove is provided on the side wall of the auxiliary wheel body. The other end of the first pull rope is located in the annular groove and connected to the auxiliary wheel body. One end of the first pull rope changes direction along the annular groove and extends to the direction-changing wheel.

[0008] As a further improvement, an annular changing wheel groove is provided on the side wall of the changing wheel, the changing wheel groove and the annular groove are located on the same vertical plane, and one end of the first pull rope extending into the changing wheel groove is connected to the locking block after being changed in direction by the changing wheel.

[0009] As a further improvement, a protrusion is provided on the direction-changing wheel groove to prevent the first pull rope from falling out.

[0010] As an improvement, the connecting rod reset mechanism is a connecting rod reset torsion spring, which is sleeved on the cross bar, one end of the connecting rod reset torsion spring is connected to the connecting frame, and the other end of the connecting rod reset torsion spring is connected to the connecting rod.

[0011] As an improvement, the locking block can be rotatably connected to the rotating shaft, the rotating shaft is fixed on the connecting frame, the locking block reset mechanism is a locking block reset torsion spring sleeved on the rotating shaft, one end of the locking block reset torsion spring is connected to the connecting frame, and the other end of the locking block reset torsion spring is connected to the locking block.

[0012] As an improvement, a drawstring protective sleeve is provided on the connecting frame, and the other end of the second drawstring passes through the drawstring protective sleeve.

[0013] As an improvement, a limiting boss is provided on the outer wall of the connecting frame, which can prevent the connecting rod from continuing to rotate when the locking block is separated from the buckle block.

[0014] Compared with the prior art, the advantages of the present invention are as follows: the first pull rope is driven to move by pulling the second pull rope, thereby unlocking the locking mechanism; the two pull ropes share the pulling force, thereby extending their respective service lives; the distance between the connection point between the other end of the first pull rope and the rotating wheel and the rotation center of the rotating wheel is smaller than the distance between the connection point between the one end of the second pull rope and the rotating wheel and the rotation center of the rotating wheel; the torque for pulling the second pull rope is greater than the torque for pulling the first pull rope, and it is more labor-saving when pulling. This facilitates unlocking of the car headrest; the second pull rope is wound on the rotating wheel and is not easy to loosen, making it more labor-saving to use; the structural design of the car headrest frame is ingenious, with fewer components for unlocking and locking, occupying less space in the connecting frame, and having good use effect and very labor-saving unlocking, which is worthy of application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A three-dimensional view of the middle connecting rod after rotation;

[0017] Figure 3 yes Figure 1 Front projection of

[0018] Figure 4 yes Figure 3 Section along line AA;

[0019] Figure 5 yes Figure 2 Front projection of

[0020] Figure 6 yes Figure 5 The cross-section along line BB;

[0021] Figure 7 yes Figure 2 A stereogram at another angle;

[0022] Figure 8 yes Figure 1 A stereogram at another angle;

[0023] Figure 9 yes Figure 3 Enlarged view of part I;

[0024] Figure 10 yes Figure 7 Enlarged view of part II;

[0025] Figure 11 yes Figure 8 Enlarged view of part III. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 11 As shown, the foldable car headrest frame structure of this embodiment includes a connecting rod 2 that can be connected to the car headrest and a connecting frame 1 that can be connected to the car seat. The connecting frame 1 is rotatably connected to the cross bar 21 at the bottom of the connecting rod 2. A locking mechanism that can lock the connecting rod 2 in position on the connecting frame 1 and unlock the connecting rod 2 when the pull rope 4 is pulled, and a connecting rod reset mechanism that drives the connecting rod 2 to reset after the connecting rod 2 is unlocked are provided on the connecting frame 1. The locking mechanism includes a rotating wheel 3, a changing wheel 4, a locking block 5, a locking block reset mechanism and a buckle block 22. The buckle block 22 is fixed on the cross bar 21, and one end of the locking block is fixed to the cross bar 21. The connecting rod 2 is rotatably connected to the connecting frame 1. The other end of the locking block contacts the snap block 22 via the locking block reset mechanism. The other end of the locking block is connected to one end of the first pull rope. The other end of the first pull rope is connected to the rotating wheel 3 after being changed in direction by the changing wheel 4. The rotating wheel 3 is rotatably connected to the connecting frame 1. The rotating wheel 3 can pull the locking block 5 and the snap block 22 apart via the first pull rope 61, so that the connecting rod 2 is reset relative to the connecting frame 1 by the connecting rod reset mechanism. A second pull rope 62 is wound around the rotating wheel 3. One end of the second pull rope is fixed to the rotating wheel 3, and the other end of the second pull rope passes through the connecting frame 1 and extends to the outside of the connecting frame 1. The second pull rope 62 can be restrained in an annular groove on the side wall of the rotating wheel 3. The distance S1 from the connection point of the other end of the first pull rope to the rotating wheel to the rotation center of the rotating wheel is less than the distance S2 from the connection point of the one end of the second pull rope to the rotating wheel to the rotation center of the rotating wheel.

[0028] A rotating wheel reset torsion spring 31 is concentrically mounted on the rotating shaft of the rotating wheel 3, capable of maintaining the rotating wheel 3 in pulling the first pull rope 61. One end of the rotating wheel reset torsion spring 31 is connected to the connecting frame 1, and the other end is connected to the rotating wheel 3. A protrusion 11 is provided on the side wall of the connecting frame 1, and a connecting frame recess 111 is provided on the inner wall of the connecting frame 1 corresponding to the protrusion 11. The rotating shaft of the rotating wheel 3 is connected to the side wall of the connecting frame recess 111, and the rotating wheel reset torsion spring 31 is located between the side wall of the connecting frame recess 111 and the side wall of the rotating wheel 3. An auxiliary wheel body 32 is provided on the side wall of the rotating wheel 3 away from the rotating wheel reset torsion spring 31. An annular groove 321 is provided on the side wall of the auxiliary wheel body 32. The other end of the first pull rope is located in the annular groove 321 and connected to the auxiliary wheel body 32. One end of the first pull rope extends along the annular groove 321 toward the rearward-direction wheel 4. An annular turning wheel groove 41 is provided on the side wall of the turning wheel 4. The turning wheel groove 41 and the annular groove 321 are located on the same vertical plane. One end of the first pull rope extending into the turning wheel groove 41 is connected to the locking block 5 after being changed in direction by the turning wheel 4. A protrusion 42 is provided on the turning wheel groove 41 to prevent the first pull rope 61 from falling out. The connection method of the two ends of the rotating wheel reset torsion spring 31 is well known in the art and can be as follows: Figure 9 As shown, one end is inserted into the connecting hole of the connecting frame, and the other end is inserted into the connecting groove of the side wall of the rotating wheel.

[0029] The connecting rod reset mechanism is a connecting rod reset torsion spring 23, which is sleeved on the cross bar 21, one end of the connecting rod reset torsion spring 23 is connected to the connecting frame 1, and the other end of the connecting rod reset torsion spring 23 is connected to the connecting rod 2. The locking block 5 is rotatably connected to the rotating shaft 51, and the rotating shaft 51 is fixed to the connecting frame 1. The locking block reset mechanism is a locking block reset torsion spring 52 sleeved on the rotating shaft 51, one end of the locking block reset torsion spring 52 is connected to the connecting frame 1, and the other end of the locking block reset torsion spring 52 is connected to the locking block 5. A pull rope protective sleeve 12 is provided on the connecting frame 1, and the other end of the second pull rope passes through the pull rope protective sleeve 12. The pull rope protective sleeve 12 is a rigid sleeve. A limiting boss 13 is provided on the outer wall of the connecting frame 1, which can prevent the connecting rod 2 from continuing to rotate when the locking block 5 is separated from the buckle block 22. The connection method of the two ends of the locking block reset torsion spring 52 belongs to the well-known technology, which can be as follows Figure 10 The two ends are buckled in the corresponding positions. The connection method of the two ends of the connecting rod reset torsion spring 23 is also a well-known technology. Figure 7 As shown, one end contacts the inner wall of the connecting frame, and the other end is snapped onto the pin on the crossbar of the connecting rod.

[0030] Working principle: Pull the second pull rope. Since one end of the second pull rope is wound on the rotating wheel, the second pull rope pulls the rotating wheel to rotate, and the auxiliary wheel body rotates with the rotating wheel, thereby pulling the first pull rope. After the first pull rope is tensioned and changed in direction by the changing wheel, it pulls the locking block, so that the locking block is separated from the buckle block. The connecting rod is rotated relative to the connecting frame by the action of the connecting rod reset torsion spring, thereby rotating and resetting.

[0031] When the headrest is needed, the headrest or the connecting rod is pushed, and the connecting rod rotates in the opposite direction so that the buckle block is buckled on the locking block and locked, so that the headrest rises for the user to lean on.

Claims

1. A foldable automobile headrest frame structure, comprising a connecting rod (2) capable of connecting to an automobile headrest and a connecting frame (1) capable of connecting to an automobile seat, wherein the connecting frame (1) and a crossbar (21) at the bottom of the connecting rod (2) are rotatably connected together, and a locking mechanism capable of locking and positioning the connecting rod (2) on the connecting frame (1) and unlocking the connecting rod (2) when a pull rope (4) is pulled is provided on the connecting frame (1), and a connecting rod reset mechanism for driving the connecting rod (2) to reset after the connecting rod (2) is unlocked is provided, characterized in that: The locking mechanism comprises a rotating wheel (3), a direction-changing wheel (4), a locking block (5), a locking block reset mechanism and a snap block (22); the snap block (22) is fixed on the cross bar (21); one end of the locking block is rotatably connected to the connecting frame (1); the other end of the locking block contacts the snap block (22) via the locking block reset mechanism; the other end of the locking block is connected to one end of the first pull rope; the other end of the first pull rope is connected to the rotating wheel (3) after being changed in direction by the direction-changing wheel (4); the rotating wheel (3) is rotatably connected to the connecting frame (1); The rotating wheel (3) can pull the locking block (5) and the buckle block (22) apart by the first pull rope (61), so that the connecting rod (2) is driven by the connecting rod reset mechanism to reset relative to the connecting frame (1). A second pull rope (62) is wound on the rotating wheel (3), one end of the second pull rope is fixed to the rotating wheel (3), and the other end of the second pull rope passes through the connecting frame (1) and extends to the outside of the connecting frame (1). The distance (S1) from the connection point of the other end of the first pull rope with the rotating wheel to the rotation center of the rotating wheel is smaller than the distance from the connection point of the second pull rope with the rotating wheel to the rotation center of the rotating wheel. The distance (S2) between the center and the center of the rotating wheel (3) is concentrically sleeved on the rotating shaft of the rotating wheel (3) with a rotating wheel reset torsion spring (31) capable of keeping the rotating wheel (3) pulling the first pull rope (61), one end of the rotating wheel reset torsion spring (31) is connected to the connecting frame (1), and the other end of the rotating wheel reset torsion spring (31) is connected to the rotating wheel (3); a protrusion (11) is provided on the side wall of the connecting frame (1), and a connecting frame recess (111) is provided on the inner wall of the connecting frame (1) corresponding to the protrusion (11), and the rotating wheel (3) is rotated. The shaft is connected to the side wall of the connecting frame recess (111), and the rotating wheel reset torsion spring (31) is located between the side wall of the connecting frame recess (111) and the side wall of the rotating wheel (3); an auxiliary wheel body (32) is provided on the side wall of the rotating wheel (3) away from the rotating wheel reset torsion spring (31), and an annular groove (321) is provided on the side wall of the auxiliary wheel body (32); the other end of the first pull rope is located in the annular groove (321) and connected to the auxiliary wheel body (32), and one end of the first pull rope changes direction along the annular groove (321) and extends toward the rearward-direction-changing wheel (4).

2. The automobile headrest frame structure according to claim 1, characterized in that: An annular direction-changing wheel groove (41) is provided on the side wall of the direction-changing wheel (4), and the direction-changing wheel groove (41) and the annular groove (321) are located on the same vertical plane. One end of the first pull rope extending into the direction-changing wheel groove (41) is connected to the locking block (5) after being changed in direction by the direction-changing wheel (4).

3. The automobile headrest frame structure according to claim 2, characterized in that: A protrusion (42) capable of preventing the first pull rope (61) from falling out is provided on the direction-changing wheel groove (41).

4. The automobile headrest frame structure according to any one of claims 1 to 3, characterized in that: The connecting rod reset mechanism is a connecting rod reset torsion spring (23), which is sleeved on the cross bar (21), one end of the connecting rod reset torsion spring (23) is connected to the connecting frame (1), and the other end of the connecting rod reset torsion spring (23) is connected to the connecting rod (2).

5. The automobile headrest frame structure according to any one of claims 1 to 3, characterized in that: The locking block (5) is rotatably connected to a rotating shaft (51), and the rotating shaft (51) is fixed to a connecting frame (1). The locking block reset mechanism is a locking block reset torsion spring (52) sleeved on the rotating shaft (51), one end of the locking block reset torsion spring (52) is connected to the connecting frame (1), and the other end of the locking block reset torsion spring (52) is connected to the locking block (5).

6. The automobile headrest frame structure according to any one of claims 1 to 3, characterized in that: A drawstring protective sleeve (12) is provided on the connecting frame (1), and the other end of the second drawstring passes through the drawstring protective sleeve (12).

7. The automobile headrest frame structure according to any one of claims 1 to 3, characterized in that: A limiting boss (13) is provided on the outer wall of the connecting frame (1) and is capable of preventing the connecting rod (2) from continuing to rotate when the locking block (5) and the buckle block (22) are separated.

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