JPH0415074Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reclining device for a vehicle seat, and particularly relates to a reclining device that adjusts the angle by meshing a gear and a latch.

[Prior Art] A reclining device that adjusts the inclination angle of a seat bag with respect to a seat cushion has conventionally used gears and latches that mesh with each other. Moreover, in such a reclining device,
A return spring is incorporated, and this return spring biases the seat back in the forward direction (Japanese Patent Laid-Open No. 57-134340, Japanese Patent Laid-open No. 58
-199233, Japanese Unexamined Patent Publication No. 58-39538). Therefore, when the gear and the latch are disengaged, the seat back is once brought forward by the spring force of the return spring, and from this state the seat back is raised to bring the gear and the latch into engagement.

[Problems to be solved by the invention] However, in the conventional reclining device, when the seat is folded forward and the gear and the latch engage with each other, the engagement is not ensured, and the gear and the latch do not engage with each other. There is a collision and friction. For this reason, there are problems in that abnormal noise is generated during meshing, and the gear and latch wear out prematurely.

The present invention was made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a reclining device that can reliably engage the gear and the latch.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a mechanism for adjusting the angle of the back frame by meshing the gear provided at the pivot portion of the back frame with the gear provided on the cushion frame. It is equipped with a latch to perform the
A guide surface rising higher than the gear is formed at the end of the gear, and a shoulder portion is formed at the end of the latch to slide into contact with the guide surface at a position where it meshes with the gear. It is characterized by

[Function] Since the present invention is constructed as described above, the sliding contact between the shoulder portion of the latch and the guide surface of the gear causes
Guidance for engagement between the gear and the latch is provided.

[Example] Hereinafter, the present invention will be specifically described with reference to an illustrative example.

Fig. 1 is an exploded perspective view of one embodiment of the present invention;
The figure is a side view showing the reclining operation.
Figures a, b, and c are side views showing the relationship between the gear and the latch. 1 is a cushion frame (not shown)
A base bracket is fixed to the base bracket, and an arm 2 constituting the lower end of a back frame (not shown) is rotatably supported. The arm 2 is pivotally supported by attaching the arm 2 to the base bracket 1 via the main shaft 10 which is inserted into the base bracket 1 with its rotation restricted, thereby allowing the back frame to recline with respect to the cushion frame. It is operational. A gear 3 is fixed to the arm 2 by a plurality of pins 13 so as to rotate integrally with the arm 2. Gear teeth 3a are formed on the lower edge of the gear 3, and a guide pin 14 for guiding the rotation of the arm 2 is attached to the upper part of the gear 3.
It is inserted into an arcuate guide slit 16 provided at the top. This allows the guide pin 14 to align with the guide slit 16 during the reclining operation.
sliding, ensuring rattling-free operation. A sub-bracket 6 holds the arm 2 and gear 3 between it and the base bracket 1 to prevent them from coming off. The main shaft 10 passes through the sub-bracket 6, and the center end of a return spring 8 made of a spiral spring is locked to the tip of the main shaft 10 that has passed through the sub-bracket 6.
The outer end of the arm 2 is locked to the guide pin 14 passing through the arm 2. As a result, the back frame is always urged forward via the arm 2. Therefore, after the seat back is reclined, when the lock is released, the seat back is automatically rotated back by the spring force of the return spring 8. On the other hand, the angle adjustment of the seat back during reclining is performed by the latch 4 meshing with the gear 3. The latch 4 is rotatably attached to the base bracket 1 by a latch pin 11, and its gear teeth 4a are formed to mesh with the gear teeth 3a of the gear 3. Further, a slightly recessed cam portion 4b is formed on the surface opposite to the latch teeth 4a, and the cam 5 is in contact with the cam portion 4b. cam 5
is rotatably attached to the base bracket 1 with one end fixed to a cam pin 12 rotatably inserted into the base bracket 1. The other end of the cam pin 12 is inserted into and fixed to an operating lever 7 rotatably attached to the base bracket 1 by a release pin 15, and when the operating lever 7 is rotated, the cam 5 is moved to the cam of the latch 4. It rotates away from the pressure on the surface 4b. Rotation of the operating lever 7 is guided by the tip of a latch pin 11 inserted into a long hole 7a formed in the operating lever 7.
As a result, the latch 4 is disengaged from the gear 3 and the lock is released, making it possible to adjust the angle of the seat back. A release spring 9 such as a tension spring is stretched between the release pin 15 and the sub-bracket 6, and the operating lever 7 is biased to rotate counterclockwise. is energized so as to press against the cam surface of the latch 4.

In this embodiment, the gear 3 and latch 4 are constructed as shown in FIG. That is, the upper end of the gear tooth 3a of the gear 3 has a guide surface 1 that stands up higher than the gear tooth 3a.
7 is formed, and a shoulder portion 18 corresponding to the guide surface 17 is formed at the upper end of the latch 4. The shoulder portion 18 is formed at a lower position than the gear teeth 4a formed on the latch 4, and
Preferably, the notch is cut out in an arc shape. The shoulder portion 18 and the guide surface 17 are in sliding contact with each other to guide the gear tooth 3a of the gear 3 and the latch tooth 4a of the latch 4 so that they mesh reliably, and the angle and height thereof are determined by the gear tooth 3a. ，
It is designed as appropriate based on the correlation with 4a.

Next, the operation of this embodiment will be explained. Figure 2 shows
The rotation range of the arm 2 is shown, with region B being the range in which reclining can be adjusted, and region A being the range in which the seat back (that is, arm 2) can be tilted forward. In region B, the gear 3 and latch 4 mesh to adjust the seat back angle. On the other hand, area A
The gear 3 and the latch 4 are disengaged, and the return spring 8 is biased so that the seatback is tilted forward. When the seatback is raised from this state, the gear 3 and the latch 4 are engaged in the neutral position. In such a raising operation, in region A, the guide surface 17 of the gear 3 and the toothless surface continuing upward from the guide surface 17 slide on the gear teeth 4a of the latch 4, as shown in FIG. 3a. When approaching the end of the raising position, that is, the neutral position, the guide surface 17 of the gear 3 is moved toward the latch 4 as shown in FIG. 3b.
approaches the gear tooth 4a of the latch 4, and the shoulder part 1 of the latch 4
Slide into contact with 8. When the neutral position is reached, the guide surface 17 of the gear 3 reaches the end of the shoulder portion 18 of the latch 4, and the guide surface 17 fits into the shoulder portion 18, as shown in FIG. 3c. Guide surface 1
7 and the shoulder portion 18 are formed at an angle and height such that the gear teeth 3a of the gear 3 and the gear teeth 4a of the latch 4 mesh with each other.
will surely engage in the proper position. Therefore, the gear teeth 3a and 4a at the beginning of meshing between the gear 3 and the latch 4
Since the collision between the two gears is avoided, the occurrence of abnormal noise and wear of the gear teeth 3a, 4a can be prevented.

``Effects of the invention'' As described above, in this invention, the gear and latch that adjust the angle of the seatback are provided with a guide surface and a shoulder portion that guide the meshing of the gear teeth, so that the meshing between the gear and the latch is ensured. This can prevent noise, damage, and wear.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of one embodiment of the present invention;
The figure is a side view showing the reclining operation.
Figures a, b, and c are side views showing the relationship between the gear and the latch during reclining operation. 3...Gear, 3a...Gear tooth, 4...Latch,
4a...Gear tooth, 17...Guide surface, 18...Shoulder portion.

Claims (1)

[Scope of utility model registration request] It comprises a gear provided at the pivot point of the back frame, and a latch provided on the cushion frame that meshes with the gear to adjust the angle of the back frame, and a latch is provided at the end of the gear that is higher than the gear. A reclining device characterized in that a guide surface is formed that stands up as shown in FIG.