JP2580654Y2 - Reclining mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a lower arm fixed to a seat cushion side, an upper arm provided to be tiltable with respect to the lower arm via a hinge pin, and to rotate integrally with the upper arm. A ratchet with teeth formed thereon, rotatably provided on the lower arm,
A pole formed with teeth that can be disengaged from the teeth of the ratchet, a release arm that presses the back of the pole to engage the teeth of the pawl with the teeth of the ratchet, The present invention relates to a reclining mechanism including a release arm and a lower arm plate disposed between poles.

[0002]

2. Description of the Related Art Next, a conventional example will be described with reference to the drawings. FIG. 5 is a side view showing one of conventional double-sided reclining devices, and FIG. 6 is a sectional view taken along the line AA in FIG.

[0003] First, a lower arm 1 is fixed to the seat cushion side, and a hinge pin 2 is attached to the lower arm 1.
Thus, the upper arm 3 is pivotally supported so as to be tiltable.
The upper arm 3 has its upper part fixed to the seat back side, and is urged by a spiral spring 4 in the forward falling direction. Reference numeral 5 denotes a fan-shaped ratchet, whose base end is fixed to the upper arm 3 and rotates integrally with the upper arm 3. In this ratchet 5,
A pin 7 having one end inserted into the arc-shaped long hole 6 of the lower arm 1 is fixed. The maximum rotation angle of the upper arm 3 is
It is determined by the rotation range of the pin 7. Further, the ratchet 5 has teeth 5a with engraved teeth at the lower and center portions of the arc portion, and a plain topping portion 5b at the upper portion of the arc portion.
Are formed.

[0004] Reference numeral 8 denotes a pole having a tooth 8a which can be engaged with the tooth 5a of the ratchet 5 formed at the rotation end, and is rotatably attached to the lower arm 1 by a pole hinge pin 9. A pin 10 is implanted on the pole 8. Reference numeral 11 denotes a release arm pivotally mounted on the hinge pin 2 and urged by a tension spring 20 in a counterclockwise direction in FIG. 3, and the pin 10 is inserted through the cam hole 12 thereof. The extension of the release arm 11 is
It has become. An arm plate 14 has one end pivotally attached to the hinge pin 2 and the other end fixed to the release arm 11 with an arm hinge pin 15. A roller 16 that comes into contact with the back of the pole 8 is inserted through the large diameter portion of the arm hinge pin 15. Reference numeral 17 denotes a connecting pipe to which a hook plate 18 is fixed at an end by welding or the like.
The small diameter portion of the hinge pin 2 is inserted into one end.

[0005] The tip of the hook plate 18 is inserted into a connection hole 19 of the arm plate 14. The width of the tip of the hook plate 18 is
Is smaller than the width of the connection hole 19.

Reference numeral 21 denotes a release arm 11 and a pole 8
A lower arm plate having a substantially triangular shape disposed between the lower arm 1 and the lower arm 1. The other two ends are engaged with the lower arm 1 by the pole hinge pins 9 and the pins 23. I have. The lower arm plate 21 covers the meshing portion between the pawl 8 and the ratchet 5,
An axial displacement of the hinge pin 2 in the engagement between the pawl 8 and the ratchet 5 is regulated.

The lower arm 1, the ratchet 5, the upper arm 3, the lower arm plate 21, and the release arm 1
Reference numeral 1 indicates that the hinge pin 2 is prevented from moving in the axial direction by the flange portion 2a of the hinge pin 2 and the E-ring 22 engaging with the hinge pin 2.

Next, the operation of the above configuration will be described. When the handle 13 (release arm 11) is rotated clockwise in FIG. 5 against the urging force of the tension spring 20, the pawl 8 is guided by the cam hole 12 and rotates counterclockwise. The engagement with the tooth portion 5a is released, and the upper arm 3 can be tilted with respect to the lower arm 1.

On the other hand, the turning force of the handle 13 is applied to the hook plate 1 inserted into the connecting hole 19 in the arm plate 14.
8. The hook plate 18 is transmitted to the inner reclining device via the connecting pipe 17 to which the hook plate 18 is fixed.

When the desired reclining angle is obtained by tilting the upper arm 3, the force for rotating the handle 13 is released. Then, the urging force of the tension spring 20 is transmitted to the roller 16 via the release arm 11 and the pin 15, and the roller 16 presses the back of the pawl 8, and the tooth 8 a of the pawl 8 returns to the tooth 5 a of the ratchet 5. And lock state.

When the handle 13 is rotated clockwise in FIG. 5 in a non-seated state to disengage the teeth 8a of the pawl 8 and the teeth 5a of the ratchet 5, the urging force of the spiral spring 4 is released. Thus, the upper arm 3
The pin 7 is tilted forward until it contacts the lower end of the slot 6.
Then, the tooth portion 8a of the pawl 8 comes into contact with the topping portion 5b of the ratchet 5 to be in an unlocked state, and the upper arm 3 is in a forwardly inclined state in which the upper arm 3 can be inclined backward against the urging force of the spiral spring 4.

[0012]

However, in the reclining mechanism having the above structure, when an excessive external load such as a collision occurs, the pole 8 exceeds the pressing force of the roller 16 and the pole 8 moves in the radial direction of rotation. And the engagement (engagement) between the pawl 8 and the ratchet 5 may be released.

The present invention has been made in view of the above problems, and has as its object to provide a reclining mechanism capable of increasing the engagement strength between a pawl and a ratchet.

[0014]

According to the present invention, there is provided a lower arm fixed to a seat cushion,
An upper arm that is provided to be tiltable with respect to the lower arm via a hinge pin; a ratchet that rotates integrally with the upper arm and has a tooth portion; and a ratchet that is rotatably provided on the lower arm and that is provided on the lower arm. A pole having a tooth portion that can be disengaged from the portion, a release arm that presses a back portion of the pole to engage the tooth portion of the pawl with the tooth portion of the ratchet,
A reclining mechanism comprising a lower arm plate disposed between the poles, wherein a circular arc-shaped long hole centered on the rotation center of the pole is formed at the rotating end of the pole, and the lower arm and the lower arm plate are disposed between the lower arm and the lower arm plate. Is provided with a pin that is loosely fitted in the arc-shaped elongated hole.

[0015]

In the reclining mechanism of the present invention, even if an external load acts on the pole, the pole engages with the pin at two points, the rotating end and the rotating end, and the pole moves in the radial direction of rotation. Since the movement is restricted, the engagement with the ratchet is not easily released.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing one side of a reclining device according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of BB in FIG. 1, FIG. 3 is an exploded perspective view of a pole in FIG. 1, and FIG. FIG.

In the drawing, reference numeral 31 denotes a lower arm fixed to the seat cushion side, and an upper arm 33 is pivotally supported on the lower arm 31 by a hinge pin 32 so as to be tiltable. The upper arm 33 has an upper part fixed to the seat back side.
4 is urged in the forward falling direction. A fan-shaped ratchet 35 has a base end fixed to the upper arm 33 and rotates integrally with the upper arm 33. A pin 37 whose one end is inserted into the arc-shaped long hole 36 of the lower arm 1 is fixed to the ratchet 35. The maximum rotation angle of the upper arm 33 is determined by the rotation range of the pin 37. Further, a tooth portion 35a with teeth is formed at a lower portion and a central portion of the arc portion of the ratchet 35,
A plain topping portion 35b is formed above the arc portion.

Numeral 38 denotes a pole which has a tooth portion 38a which can be engaged with the tooth portion 35a of the ratchet 35 formed at an intermediate portion, and which is rotatably mounted on the upper end of the lower arm 31 by a pole hinge pin 39 at a rotation base end portion. is there. In addition, Paul 3
An arc-shaped elongated hole 38b centered on the pole hinge pin 39 is formed at the rotating end of the shaft 8. Also, Paul 38
, A pin 40 is implanted. 41 is the hinge pin 3
A pin 40 is inserted through a cam hole 42 of the release arm which is pivotally mounted on the release arm 2 and urged by a tension spring 50 in a counterclockwise direction in FIG. An extension of the release arm 41 is a handle 43. 44
Is an arm plate having one end pivotally connected to a hinge pin 32 and the other end fixed to the release arm 41 with an arm hinge pin 45. A roller 46 that comes into contact with the back of the pole 38 is inserted through the large diameter portion of the arm hinge pin 45.

Reference numeral 47 denotes a connecting pipe having a hook plate 48 fixed to an end by welding or the like, and a small-diameter portion of the hinge pin 32 is inserted into one end of the connecting pipe. The tip of the hook plate 48 is inserted into a connection hole 49 of the arm plate 44. The width of the tip of the hook plate 48 is selected to be smaller than the width of the connection hole 49 of the arm plate 44.

Reference numeral 51 denotes a substantially triangular lower arm plate disposed between the release arm 41 and the pole 38.
One end engages the hinge pin 32, and one end is locked to the lower arm 31 with the hinge pin 39,
The other end is erected on the lower arm 31 and is engaged with a lower arm pin 60 that is loosely fitted in the elongated hole 38 b of the pole 38. The lower arm plate 51 covers the meshing portion between the pawl 38 and the ratchet 35 and regulates the displacement of the hinge pin 32 in the meshing between the pawl 38 and the ratchet 35 in the axial direction.

The lower arm 31, the ratchet 35, the upper arm 33, the lower arm plate 51, and the release arm 41 are connected to the hinge pin 32a of the hinge pin 32 and the E-ring 52 which engages with the hinge pin 32.
2 is prohibited in the axial direction.

Next, the operation of the above configuration will be described. When the handle 43 (release arm 41) is rotated clockwise in FIG. 1 against the urging force of the tension spring 50, the pawl 38 is guided by the cam hole 42 and rotates clockwise, and the teeth of the ratchet 35 are rotated. The engagement with the portion 35a is released, and the upper arm 33 can be tilted with respect to the lower arm 31.

On the other hand, the rotational force of the handle 43 is applied to the hook plate 4 inserted into the connecting hole 49 in the arm plate 44.
8, transmitted to the inner reclining device via the connecting pipe 47 to which the hook plate 48 is fixed.

When the upper arm 33 is tilted to obtain a desired reclining angle, the force for rotating the handle 43 is released. Then, due to the urging force of the tension spring 50, the teeth 38a of the pawl 38 again engage with the teeth 35a of the ratchet 35, and the lock state is established.

In a non-seat state, the handle 43 is rotated clockwise in FIG.
When the engagement between the ratchet 35 and the teeth 35a of the ratchet 35 is released,
The biasing force of the spiral spring 34 causes the upper arm 33 to lean forward until the pin 37 contacts the lower end of the elongated hole 36. And the tooth portion 38a of the pole 38 is
The ratchet 53 comes into contact with the topping portion 35b of the ratchet 53 and is unlocked, and the upper arm 33 is tilted forward to be able to tilt backward against the urging force of the spiral spring 34.

According to the above configuration, even if an external load acts on the pole 38, the pole 38 has its base end rotated by the pole hinge pin 39 and its rotation end has the lower arm pin 6
Since the movement is restricted in the radial direction of rotation by 0, the engagement with the ratchet 35 is not easily released. Therefore, the engagement strength between the pawl and the ratchet can be increased as compared with the conventional reclining mechanism.

[0027]

As described above, according to the present invention, it is possible to realize a climbing mechanism capable of increasing the engagement strength between the pawl and the ratchet.

[Brief description of the drawings]

FIG. 1 is a side view showing one side of a two-sided reclining device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is an exploded perspective view of the pole in FIG.

FIG. 4 is a sectional view taken along the line CC in FIG. 1;

FIG. 5 is a side view showing one of conventional double-sided reclining devices.

6 is a sectional view taken along line AA in FIG. 5;

[Explanation of symbols]

 31 Lower Arm 32 Hinge Pin 33 Upper Arm 35 Ratchet 35a, 38a Tooth 38 Pole 38b Slot 39 Pole Hinge Pin 60 Lower Arm Pin

Claims (1)

(57) [Scope of request for utility model registration] 1. A lower arm (31) fixedly mounted on a seat cushion side, an upper arm (33) provided to be tiltable with respect to the lower arm (31) via a hinge pin (32), and an upper arm (33). ), And a ratchet (35) having teeth formed thereon, and teeth rotatably provided on the lower arm (31) and capable of engaging and disengaging with the teeth (35a) of the ratchet (35). The pole (38) formed with the portion and the back of the pole (38) are pressed to engage the teeth (38a) of the pole (38) with the teeth (35a) of the ratchet (35). Arm (41) for performing the following, and a lower arm plate (51) disposed between the release arm and the pole (38).
A reclining mechanism comprising: a circular arc-shaped elongated hole (38b) centered on the rotation center of the pole (38) at a rotating end of the pole (38);
The lower arm (31), the lower arm plate (5
1) A reclining mechanism comprising a pin (60) for loosely fitting into the arc-shaped long hole (38b) therebetween.