JPH0576343U - Reclining device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a reclining device that can reduce weight and cost while ensuring sufficient lock strength. 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, a ratchet 35 rotating integrally with the upper arm 33, and a lower arm 31. A pawl 38 rotatably provided by using a pin 40 and engageable with the ratchet 35; In the reclining device including the ratchet 35, a first tooth portion 38b and a second tooth portion 38c having different pitch circles are formed on the engagement surface 38a of the pole 38 with the ratchet 35.
The first tooth portion 35b and the pole 38 which can be engaged with the first tooth portion 38b of the pole 38 on the engaging surface 35a with the pole 38 of
The second tooth portion 35c engageable with the second tooth portion 38c is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 A lower arm fixed to the seat cushion side, an upper arm tiltably provided to the lower arm via a hinge pin, a ratchet that rotates integrally with the upper arm, and a pin for the lower arm are used. The present invention relates to a reclining device that includes a pawl that is rotatably provided and that can engage with the ratchet, and a release arm that has a base end portion that is rotatably provided on the hinge pin and that engages and disengages the pawl and the ratchet.

[0002]

[Prior Art]

 Next, a conventional example will be described with reference to the drawings. FIG. 6 is a side view showing one of the conventional double-sided reclining devices, and FIG. 7 is a sectional view taken along line AA in FIG.

First, reference numeral 1 is a lower arm fixed to the seat cushion side, and an upper arm 3 is pivotally supported on the lower arm 1 by a hinge pin 2 so as to be tiltable. The upper part of the upper arm 3 is fixed to the seat back side, and is biased in the forward tilt direction by the spiral spring 4. A ratchet 5 is fixed to the upper arm 3 and rotates integrally with the upper arm 3. A pin 7 whose one end is inserted into an 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.

Reference numeral 8 denotes a pole that engages with the ratchet 5, and is rotatably attached to the lower arm 1 with 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. 6 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 spacer 16 that contacts 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 having a hook plate 18 fixed to the end portion 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 W1 of the tip portion of the hook plate 18 is selected to be smaller than the width W2 of the connecting hole 19 of the arm plate 14. The size of W1-W2 is such that there is some play, and is determined according to the above-mentioned variation in the lock position. The play is selected to be larger than the so-called lock position shift amount between the release arm 11 and the release arm of the other reclining device. Usually, it is about 2 to 5 mm.

Reference numeral 21 denotes a substantially triangular sub-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 of which are lower arms. It is locked with a pin. The sub-plate 21 covers the meshing portion between the pole 8 and the ratchet 5, and regulates 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 sub plate 21, and the release arm 11 are prevented from moving in the axial direction of the hinge pin 2 by the flange portion 2 a of the hinge pin 2 and the E ring 22 engaging with 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. 6 against the biasing force of the tension spring 20, the pawl 8 is guided by the cam hole 12 to rotate counterclockwise, and the ratchet. The upper arm 3 is disengaged from the lower arm 1, 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 pawl 8 is again engaged with the ratchet 5 by the urging force of the tension spring 20 to be in the locked state.

[0011]

[Problems to be solved by the device]

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

The lower arm 1, the ratchet 5, the upper arm 3, the sub plate 21, and the release arm 11 are attached by the flange portion 2 a of the hinge pin 2 and the E ring 22, but the E ring 22 has poor thickness dimensional accuracy and these Rattling is likely to occur between the lower arm 1, the ratchet 5, the upper arm 3, the sub plate 21, and the release arm 11. Therefore, in order to sufficiently secure the meshing strength between the pole 8 and the ratchet 5, the plate thickness of the pole 8 and the ratchet 5 must be increased (for example, about 5 mm), and the weight of the reclining device is reduced. The cost is high and the cost is high.

Since the sub-plate 21 is used to hold down the meshing portion between the pole 8 and the ratchet 5, rigidity of the sub-plate 21 is required, which causes an increase in weight and an increase in cost.

The present invention has been made in view of the above problems, and an object thereof is to provide a reclining device capable of reducing weight and cost while ensuring sufficient locking strength.

[0015]

[Means for Solving the Problems]

 The present invention for solving the above-mentioned problems includes a lower arm fixed to the seat cushion side, an upper arm tiltably provided to the lower arm via a hinge pin, and a ratchet that rotates integrally with the upper arm. A pole rotatably provided on the lower arm using a pin and engageable with the ratchet; and a release arm having a base end portion rotatably provided on the hinge pin for engaging and disengaging the pole and the ratchet. In the reclining device including: a first tooth portion and a second tooth portion having different pitch circles are formed on the engagement surface of the pawl with the ratchet, and the pawl engagement surface of the ratchet with the pawl A first tooth portion engageable with the first tooth portion of the pole and a second tooth portion engageable with the second tooth portion of the pole are formed.

[0016]

[Action]

 In the reclining device of the present invention, by forming two tooth portions having different pitch circles on the engagement surface between the ratchet and the pole, the axial shift between the pole and ratchet is eliminated, and the ratchet and pole locking strength is eliminated. It is possible to achieve weight reduction and cost reduction while ensuring

[0017]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a main part of an embodiment of the present invention, FIG. 2 is a side view of a reclining device according to an embodiment of the present invention, which is a sectional view taken along line BB in FIG. 3, and FIG. FIG. 4 is a side view of the example reclining device, FIG. 4 is a perspective view of the pole in FIG. 2, and FIG. 5 is a perspective view of a main part of the pole in FIG.

In these figures, reference numeral 31 is 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 by the spiral spring 34 in the forward tilt direction. A ratchet 35 is provided with teeth and is fixed to the upper arm 33 so as to rotate 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 31. The maximum rotation angle of the upper arm 33 is determined by the rotation range of the pin 37.

Reference numeral 38 denotes a pole on which teeth that engage with the teeth of the ratchet 35 are engraved, and is rotatably attached to 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. 3 by a tension spring 50, and the pin 40 is inserted into the cam hole 42 thereof. The extended portion of the release arm 41 is a handle 43. Reference numeral 44 is an arm plate whose one end is pivotally attached to the hinge pin 32 and the other end is fixed to the release arm 41 by an arm hinge pin 45. The large diameter portion of the arm hinge pin 45 is inserted with a spacer 46 that abuts against the back portion of the pole 38. Reference numeral 47 is a connecting pipe having a hook plate 48 fixed to the end portion by welding or the like, and the small diameter portion of the hinge pin 32 is inserted at one end side.

Further, the tip end portion of the hook plate 48 is inserted into the connecting hole 49 of the arm plate 44. The width W1 of the tip portion of the hook plate 48 is selected to be smaller than the width W2 of the connecting hole 49 of the arm plate 44. The size of W1-W2 is such that there is some play, and is determined according to the above-mentioned variation in the lock position. The play is selected to be larger than the so-called lock position deviation between the release arm 41 and the release arm of the other reclining device. Usually, it is about 2 to 5 mm.

Reference numeral 51 is a substantially triangular sub-plate disposed between the release arm 41 and the pole 38. One end of the sub-plate 51 is engaged with the hinge pin 32, and the other two ends are locked to the lower arm 31 with pins 52 and 39.

In this embodiment, as shown in FIGS. 1 and 5, the engagement surface 38a of the pole 38 with the ratchet 35 has a first tooth portion 38b and a second tooth portion with different pitch circles. 38c is formed. On the other hand, the engaging surface 35a of the ratchet 35 that engages with the pawl 38 has a first tooth portion 35b that is engageable with the first tooth portion 38b of the pole 38 and a second tooth portion 38c of the pole 38. Engageable second teeth 35c are formed.

Next, attachment of the lower arm 31, the ratchet 35, the upper arm 33, the sub plate 51, and the release arm 41 will be described with reference to FIG. The hinge pin 32 is formed with a first collar portion 32a, a groove portion 32b and a second collar portion 32c. The lower arm 31, the ratchet 35, the upper arm 33, the sub plate 51 and the release arm are formed on the first collar portion 32a. 41 are stacked. Then, the washer 55 is attached to the groove portion 32b of the hinge pin 32, and the second flange portion 32c is crimped (C in FIG. 4) so that the lower arm 31, the ratchet 35, the upper arm 33, the sub plate 51 and the release. The arm 41 is attached.

Next, the operation of the above configuration will be described. When the handle 43 (release arm 41) is rotated clockwise in FIG. 3 against the biasing force of the tension spring 50, the pawl 38 is guided by the cam hole 42 to rotate counterclockwise, and the ratchet. The engagement with 35 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 through 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 pawl 38 is again engaged with the ratchet 35 by the urging force of the tension spring 50, and the pawl 38 is locked.

According to the above configuration, the engaging surfaces (38a, 35a) between the pole 38 and the ratchet 35 have the first tooth portions (38b, 35b) and the second tooth portions (38c, 35c) having different pitch circles. 2), the play between the pole 38 and the ratchet 35 in the axial direction of the hinge pin 32 is eliminated. Therefore, unlike the conventional reclining device, it is not necessary to extend the sub-plate 51 to cover the meshing portion between the pole 38 and the ratchet 35, and the weight and cost can be reduced.

Further, the lower arm 31, the ratchet 35, the upper arm 33, the sub plate 51, and the release arm 41 are attached to the hinge pin 32 by using caulking, which reduces the mounting man-hour and reduces the axial direction of the hinge pin 32. The dimensional accuracy is improved, and the plate thickness of the pole 38 and the ratchet 35 can be made thinner than before. Therefore, weight reduction and cost reduction can be achieved.

[0029]

[Effect of the device]

 As described above, according to the present invention, it is possible to provide a reclining device that is light in weight and costs can be reduced while ensuring sufficient lock strength.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG. 3, showing a side view of a reclining device according to an embodiment of the present invention.

FIG. 3 is a side view of a reclining device according to an embodiment of the present invention.

FIG. 4 is a perspective view of the pole in FIG.

5 is a perspective view of a main part of the pole in FIG.

FIG. 6 is a side view showing one of conventional double-sided reclining devices.

7 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

 31 Lower Arm 32 Hinge Pin 33 Upper Arm 35 Ratchet 35a, 38a Engaging Surface 35b, 38b First Tooth Part 35c, 38c Second Tooth Part 38 Pole 40, 70, 80 Pin 41 Release Arm 50, 70a Collar 51 Sub Plate 81 plate

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 the lower arm (3)
1) is rotatably provided by using a pin (40) and is engaged with the ratchet (35), and a proximal end portion is rotatably provided on the hinge pin (32). 38) and a release arm (41) that engages and disengages the ratchet (35), in the engagement surface (38a) of the pole (38) with the ratchet (35). Different first tooth (38b)
And a second tooth portion (38c), and a first tooth portion (38) of the pole (38) is formed on an engagement surface (35a) of the ratchet (35) with the pole (38).
a first tooth portion (35b) engageable with b) and a second tooth portion (35c) engageable with a second tooth portion (38c) of the pole (38). Reclining device to do.