JPH0670643U - Reclining mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object to provide a reclining mechanism capable of increasing the engagement strength between a pole and a ratchet. The release arm 41 is provided with a taper roller 46 which can be brought into contact with the back of the pole 38 and whose diameter decreases toward the lower arm 31 side.
It is configured to form a taper surface that comes into surface contact with the taper roller 46.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention has a lower arm fixed to the seat cushion side, an upper arm tiltably provided to the lower arm via a hinge pin, and rotates integrally with the upper arm to form a tooth portion. A ratchet, a pole rotatably provided on the lower arm and having a tooth portion which can be engaged with and disengaged from a tooth portion of the ratchet, and a tooth portion of the pole and the tooth of the ratchet by pressing the back portion of the pole. The present invention relates to a reclining mechanism that includes a release arm that engages with a member and a lower arm plate that is disposed between the release arm and the pole.

[0002]

[Prior art]

 Next, a conventional example will be described with reference to the drawings. FIG. 3 is a side view showing one of the conventional double-sided reclining devices, and FIG. 4 is a sectional view taken along the line AA in FIG.

First, 1 is a lower arm fixed to the seat cushion side, and an upper arm 3 is pivotally supported by a hinge pin 2 on the lower arm 1 so as to be tiltable. The upper part of the upper arm 3 is fixed to the seat back side, and is biased by the spiral spring 4 in the forward tilt direction. Reference numeral 5 denotes a fan-shaped ratchet, the base end portion of which is fixed to the upper arm 3 and rotates integrally with the upper arm 3. A pin 7 whose one end is inserted into the arc-shaped long hole 6 of the lower arm 1 is fixed to the ratchet 5. The maximum rotation angle of the upper arm 3 is determined by the rotation range of the pin 7. Further, a tooth portion 5a having teeth formed on the lower and central portions of the arc portion of the ratchet 5 is formed, and a plain topping portion 5b is formed on the upper portion of the arc portion.

Reference numeral 8 denotes a pole having a toothed portion 8 a engageable with the toothed portion 5 a of the ratchet 5 formed at a rotating end portion, and is rotatably attached to the lower arm 1 by a pin 9. A pin 10 is planted in the pole 8. Reference numeral 11 denotes a release arm pivotally attached to the hinge pin 2 and biased counterclockwise in FIG. 3 by a tension spring 20. The pin 10 is inserted into a cam hole 12 of the release arm. The extended portion of the release arm 11 is a handle 13. An arm plate 14 has one end pivotally attached to the hinge pin 2 and the other end fixed to the release arm 11 by 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 is a connecting pipe having a hook plate 18 fixed to its end by welding or the like, and the small diameter portion of the hinge pin 2 is inserted at one end side.

The tip of the hook plate 18 is inserted into the connecting hole 19 of the arm plate 14. The width of the tip portion of the hook plate 18 is selected to be smaller than the width of the connecting hole 19 of the arm plate 14.

Reference numeral 21 denotes a substantially triangular lower arm plate disposed between the release arm 11 and the pole 8, one end of which engages with the hinge pin 2 and the other two ends thereof. It is locked to the lower arm 1 with a pin. The lower arm plate 21 covers the meshing portion between the pole 8 and the ratchet 5, and restricts the axial displacement of the hinge pin 2 at the meshing between the pole 8 and the ratchet 5.

Further, the lower arm 1, the ratchet 5, the upper arm 3, the lower arm plate 21, and the release arm 11 are prohibited from axial movement of the hinge pin 2 by an E ring 22 that engages with the flange portion 2a of the hinge pin 2 and the hinge pin 2. Has been done.

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 biasing force of the tension spring 20, the pawl 8 is guided by the cam hole 12 and rotated counterclockwise to move the ratchet. The engagement of the tooth portion 5a of 5 with the upper arm 3 is released, and the upper arm 3 can be tilted with respect to the lower arm 1.

On the other hand, the rotational force of the handle 13 is transmitted to the inner reclining device via the hook plate 18 inserted into the connecting hole 19 of the arm plate 14 and the connecting pipe 17 to which the hook plate 18 is fixed. .

Then, when the upper arm 3 is tilted and a desired reclining angle is obtained, the force for rotating the handle 13 is released. Then, the biasing 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 portion of the pole 8 so that the tooth portion 8a of the pole 8 is again toothed portion of the ratchet 5. 5a is engaged and locked.

Further, when the handle 13 is rotated clockwise in FIG. 5 in the non-seated state to release the engagement between the tooth portion 8a of the pole 8 and the tooth portion 5a of the ratchet 5, the spiral spring 4 is rotated. The urging force causes the upper arm 3 to tilt forward until the pin 7 comes into contact with the lower end of the elongated hole 6. Then, the tooth portion 8a of the pole 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 leanable state in which it can be tilted backward against the biasing force of the spiral spring 4. .

[0012]

[Problems to be solved by the device]

 However, the reclining mechanism having the above configuration has the following problems.

The lower arm plate 21 prohibits the axial movement of the pin 9 on the side of the pole 8 where the tooth portion 8 a of the pole 8 and the tooth portion 5 a of the ratchet 5 are engaged (engaged). However, since there is nothing that prohibits the axial movement of the pin 9 on the back side of the pole 8 in contact with the roller 16, if excessive load from the outside acts at the time of a collision, the pole 8 and the ratchet 5 are May be disengaged.

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

[0015]

[Means for Solving the Problems]

 The present invention which solves the above-mentioned problems is provided with a lower arm fixed to the seat cushion side, an upper arm tiltably provided to the lower arm via a hinge pin, and a tooth portion which rotates integrally with the upper arm. And a pole having a tooth on the lower arm rotatably formed on the lower arm and a tooth that can be engaged with and disengaged from the tooth of the ratchet, and the tooth of the pole by pressing the back of the pole. And a lower arm plate arranged between the release arm and the pole, the release arm engaging the tooth portion of the ratchet, and the lower arm plate disposed between the release arm and the pole. A taper roller that can be contacted and whose diameter decreases toward the lower arm side is provided, and the back part of the pole comes into surface contact with the taper roller. The taper surface is formed.

[0016]

[Action]

 In the reclining mechanism of the present invention, the back part of the pole is provided on the release arm so that it can come into contact with the back part of the pole, and it comes into surface contact with the taper roller whose diameter decreases toward the lower arm side. Therefore, the movement of the pole in the lower arm direction is prohibited by contacting the lower arm, and the movement in the direction opposite to the lower arm is prohibited by the taper surface of the taper roller.

[0017]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing one of the two-sided reclining devices of one embodiment of the present invention, which is a sectional view taken along the line BB in FIG. 2, and FIG. 2 is a side view of one of the two-sided reclining devices of the one embodiment of the present invention. .

In the figure, 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 part of the upper arm 33 is fixed to the seat back side, and is biased in the forward tilt direction by a spiral spring 34. Reference numeral 35 is a fan-shaped ratchet, the base end of which is fixed to the upper arm 33 and rotates integrally with the upper arm 33. A pin 37 is fixed to the ratchet 35, one end of which is inserted into an arc-shaped long hole 36 of the lower arm 1. The maximum rotation angle of the upper arm 33 depends on the rotation range of the pin 37. Further, tooth portions 35a having teeth formed on the lower and central portions of the arc portion of the ratchet 35 are formed, and a plain topping portion 35b is formed on the upper portion of the arc portion.

Reference numeral 38 is a pole having a toothed portion 38 a engageable with the toothed portion 35 a of the ratchet 35 at the rotating end portion, and the rotating base end portion is a pole rotatably attached to the upper portion of the lower arm 31 by a pin 39. . A pin 40 is planted in the pole 38. Reference numeral 41 denotes a release arm pivotally attached to the hinge pin 32 and biased counterclockwise in FIG. 2 by a tension spring 50, and the pin 40 is inserted into a cam hole 42 of the release arm. The extended portion of the release arm 41 is a handle 43. Reference numeral 44 is an arm plate, one end of which is pivotally attached to the hinge pin 32, and the other end of which is fixed to the release arm 41 by an arm hinge pin 45. A taper roller 46 that contacts the back of the pole 38 is inserted through the large-diameter portion of the arm hinge pin 45. The cylindrical surface of the taper roller 46 is a taper whose diameter decreases toward the lower arm 31 side. The back of the pole 38 is a taper surface that comes into contact with the cylindrical surface of the taper roller 46.

Reference numeral 47 denotes a connecting pipe having a hook plate 48 fixed to its end portion by welding or the like, and a small diameter portion of the hinge pin 32 is inserted at one end side thereof. The tip of the hook plate 48 is inserted into the connecting 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 connecting 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 of the lower arm plate engages with the hinge pin 32, and the other two end portions have lower arm 31. It is locked with a pin. The lower arm plate 51 covers the meshing portion between the pole 38 and the ratchet 35, and regulates the axial displacement of the hinge pin 32 at the meshing between the pole 38 and the ratchet 35.

Further, the lower arm 31, the ratchet 35, the upper arm 33, the lower arm plate 51 and the release arm 41 are prohibited from axial movement of the hinge pin 32 by the E ring 52 which engages with the flange portion 32a of the hinge pin 32 and the hinge pin 32. Has been done.

Next, the operation of the above configuration will be described. When the handle 43 (release arm 41) is rotated clockwise in FIG. 2 against the biasing force of the tension spring 50, the pawl 38 is guided by the cam hole 42 to rotate clockwise, and the ratchet 35. The engagement with the tooth portion 35a is released, and the upper arm 33 becomes tiltable with respect to the lower arm 31.

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

Then, when the upper arm 33 is tilted and a desired reclining angle is obtained, the force for rotating the handle 43 is released. Then, the tooth portion 38a of the pawl 38 is again engaged with the tooth portion 35a of the ratchet 35 by the biasing force of the tension spring 50, and a locked state is established.

Further, when the handle 43 is rotated clockwise in FIG. 2 in the non-seated state to release the engagement between the tooth portion 38a of the pole 38 and the tooth portion 35a of the ratchet 35, the spiral spring 34 is rotated. The urging force causes the upper arm 33 to tilt forward until the pin 37 comes into contact with the lower end of the elongated hole 36. Then, the tooth portion 38a of the pole 38 comes into contact with the topping portion 35b of the ratchet 53 to be in an unlocked state, and the upper arm 33 is in a forwardly leanable state in which it can be tilted backward against the biasing force of the spiral spring 34. .

According to the above configuration, the back portion of the pole 38 is formed into a taper surface that can come into surface contact with the taper cylindrical surface whose diameter decreases toward the lower arm 31 side of the taper roller 46. Therefore, the movement of the back portion of the pole 38 toward the lower arm 31 is prohibited by contacting the lower arm 31, and the movement toward the opposite side of the lower arm 31 is prohibited by the taper surface of the taper roller 46. On the tooth 38a side of the pole 38, the lower arm 31 and the lower arm plate 51 prevent the pin 39 from moving on the shaft side.

Therefore, the engagement strength between the pole and the ratchet can be increased as compared with the conventional example.

[0029]

[Effect of device]

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

[Brief description of drawings]

FIG. 1 is a side view showing one of the two-sided reclining devices of one embodiment of the present invention, which is a sectional view taken along the line BB in FIG.

FIG. 2 is a side view showing one of the two-sided reclining devices according to one embodiment of the present invention.

FIG. 3 is a side view showing one of conventional double-sided reclining devices.

FIG. 4 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 31 Lower Arm 32 Hinge Pin 33 Upper Arm 35 Ratchet 35a, 38a Teeth 38 Pole 46 Tapered Roller

Claims (1)

[Scope of utility model registration request] 1. A lower arm (31) fixed to a seat cushion side, an upper arm (33) tiltably provided to the lower arm (31) via a hinge pin (32), and the upper arm (33). ) And a ratchet (35) having teeth formed thereon, and a tooth rotatably provided on the lower arm (31) and disengageable with the teeth (35a) of the ratchet (35). The pole (38) having the formed portion and the back portion of the pole (38) are pressed to engage the tooth portion (38a) of the pole (38) with the tooth portion (35a) of the ratchet (35). Release arm (41) for performing the lower arm plate (51) arranged between the release arm and the pole (38)
In the reclining mechanism including: the release arm (41) is provided with a taper roller (46) capable of contacting the back of the pole (38) and having a diameter that decreases toward the lower arm (31) side. The back of (38) has the taper roller (4
A reclining mechanism characterized in that a taper surface that comes into surface contact with 6) is formed.