JPS5911644Y2 - Automobile seat liner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile seat recliner, that is, a seat inclination angle adjustment device.

In particular, the inclination angle of the seatback is adjusted by fixing a latch to the seatback concentrically with its pivot axis, pivoting a pole to the seat, and engaging and disengaging the teeth of the pole and the teeth of the latch with each other. Regarding seat recliners.

Specifically, as shown in FIG. 6, an arm 30 fixed to a seat back (not shown) is pivoted to a base 31 fixed to a seat (not shown) by a pivot 32. The present invention relates to a seat recliner in which a latch 1 is integrally fixed to an arm 30 concentrically with a shaft 32, and a pawl 2 is pivotally connected to a base 31 by a pivot 3.

In addition, in the figure, the manual operation handle 33 is connected to the pivot 32.
It is also pivotally connected to the base 31.

The hand groove 33 has a cam hole 34 into which the pole 2 is inserted.
A pin 35 protruding from is engaged.

The handle 33 is biased by a spring 36 to rotate counterclockwise in the figure, and remains stationary at the solid line position when the cam hole 34,
Pole 2 is maintained in engagement with latch 1 via pin 35.

On the other hand, at the imaginary line position of the handle, the pole is disengaged from the latch, and the arm 30 and therefore the seat back can be tilted about the pivot 32.

In this type of seat recliner, in the middle of the operation when the seat back is tilted forward at a large angle, the seat back is raised up to the normal use angle, and the seat back is locked and held in that position, the pole is The latch changes from a state of sliding movement with the toothless portion of the peripheral edge of the latch to a state of engagement with the toothed portion.

When this state is reached, the seat back temporarily stops pivoting, and is then tilted at a small angle in the same direction, finely adjusted, and locked.

However, in conventional seat recliners, when the pole should first engage with the toothed portion of the latch, the seat back tilts at an excessive angle without engaging with the teeth of the latch, resulting in a so-called skipping phenomenon. Adjusting the inclination angle of the seat back can be difficult and time-consuming.

Particularly in so-called two-door automobiles, passengers in the rear seats enter and exit the vehicle with the seatbacks of the front passenger seats tilted forward, and therefore the seatbacks are frequently folded and raised forward.

Therefore, it is extremely inconvenient to take time and effort to adjust the angle of the seat back as described above.

The above is a disadvantage when the height of the toothless part of the latch is higher than the tooth height of the latch, but if the toothless part of the latch is shaped to almost the same height as the tooth height of the latch, When the seat back is raised, while the teeth of the pole are still partially rubbing against the toothless part, the teeth of the latch adjacent to this toothless part hit one of the teeth of the pole, and as a result, the pole and The latch teeth become unable to interlock.

The present invention attempts to avoid the above-mentioned drawbacks of the prior art, and the tooth height of each tooth of the pole is increased sequentially from the tooth closest to the axis of the pole to the tooth furthest from the axis of the pole.

The seat recliner of the present invention will be explained below with reference to the drawings while comparing it with a conventional one.

1-3 illustrate a portion of a conventional seat recliner latch and pole.

Reference numeral 1 indicates a latch fixed to the side of the seat back of an automobile seat, and reference numeral 2 indicates a pole pivotally connected to the side of the seat in the form of a lever.

Reference numeral 3 designates a pivot shaft of the pole 2, which occupies a predetermined position on the side of the seat.

Note that the pawl 2 is biased by a spring (not shown) so as to rotate the latch in the engaging direction.

The latch 1 has a series of teeth 4 arranged in an arc.

The center of curvature of this arcuate tooth row is concentric with the pivot center of the seat back (not shown).

The latch 1 has an arcuate toothless portion 5 following the teeth 4.

When raising the seat back, the latch 1 is rotated in the direction of the arrow, and when lowering the seat back, it is rotated in the direction opposite to the arrow.

Therefore, the seat back is folded down forward toward the left in FIG. 1 and raised toward the right.

When the seat pack is folded forward, the teeth 6 of the pawl 2 are in a sliding state on the toothless portion 5 of the latch 1, and in the state shown in Fig. 1, the seat back is rotated from the forward folded position to the upright position. It is shown that the teeth 6 of the pawl 2 are all beginning to engage the teeth 4 of the latch 1 near the end position of its rotation stroke.

From this state, when the latch 1 is further rotated by a slight angle in the direction of the arrow, the state shown in FIG. 2 is obtained.

In the state shown in Fig. 2, the leading tooth 6a of the pawl 2 is the latch 1.
It rests on the tip of tooth 4b.

Since the pawl 2 makes a lever motion around the pivot 3, there is a difference in the timing at which the teeth 6a and 6g start engaging with the latch.

In this state, the engagement between the teeth of the pawl 2 and the teeth of the latch 1 is temporarily interrupted.

However, since latch 1 still rotates in the direction of the arrow, pole 2
should be easier to engage with the latch teeth, but Paul 2
The falling of each tooth is delayed from the rotation of the latch,
You will be in the state shown in Figure 3 and you will win.

Although the pawl 2 is biased by the spring in the direction of engagement with the latch 1 as described above, this delay is likely to occur depending on the speed of the seat back raising operation.

In other words, there must have been an opportunity for the tooth 6a to engage with the tooth 4a more easily than in the stage shown in FIG. Full engagement is still delayed and the skipped stitch phenomenon described above occurs.

As a result, the latch 1 slides and rotates against the pawl 2 while being disengaged from the pawl 2 while making an unusual noise.

Therefore, the seat back is tilted backwards by an excessive angle, and the seat back is rotated forward again to adjust the tilt angle.

The toothless portion 5 of the latch 1 is normally sized to allow the seat back to freely rotate until its inclination angle approaches the angle most frequently used.

Therefore, the teeth from 6a to 6g of pole 2 and 4 of latch 1 are
If the latch 1 rotates in the direction of the arrow by passing several pitches or more without engaging the teeth from a to 4g, it will take time to adjust the seat back inclination as described above. .

The proposed seat recliner has each tooth 16 of its pole 12.
By shaping the teeth a to 16g such that the tooth height increases sequentially from the side closer to the axis 3 of the pawl 2, that is, from the left side in the drawing, the above-described drawbacks of the conventional art are avoided.

The length of each of the teeth 163 to 16g is obtained by removing the portion from the imaginary line shown in FIG. 2 to the crushing surface of the tooth.

The proposed pole 12 with tooth height set along this imaginary line is as shown in Fig. 4, with each tooth 16a to 16g of the pole 12.
The curve connecting the tips of the teeth is determined to form a circular arc centered on the axis of the latch when the pawl starts to mesh with the teeth 141 to 14g of the latch 11.

Therefore, each tooth 16a to 16g of the pole is tooth 1 of the latch.
It is possible to start meshing and proceed at the same time as 4a to 14g.

The condition shown in FIG. 4 is almost equivalent to the conventional staircase shown in FIG. tooth 16
a is not interfered with by tooth 14b.

In addition, the teeth 16b to 16f are similarly not interfered with by the corresponding teeth of the latch 11.

Thus, as shown in FIG. 5, all teeth of pawl 12 engage teeth 14a-14g of latch 11 at the same time.

Therefore, even if the height of the toothless portion 5 of the latch 11 is made approximately equal to the height of each tooth 14a to 14g of the latch, the last tooth 16g of the pawl 12 still remains on the toothless portion 5. The teeth 16a do not come into contact with the teeth of the latch when the latch is closed.

It should be noted that it is theoretically possible to obtain the same effect even if the tooth height of the teeth 142 to 14g of the latch 11 is shaped as described above instead of shaping the tooth height of the pawl 12 as described above. is conceivable.

However, in this case, if for some reason the tooth 16a of the pole comes into engagement with the tooth next to the tooth 14a, the desired effect will no longer be obtained at all.

As described above, the seat recliner of the present invention can avoid the drawbacks of the conventional seat recliner by simply setting the tooth height of the pawl 12 to increase gradually as it moves away from the pivot axis of the pawl.

[Brief explanation of drawings]

Figures 1 to 3 are partially cutaway enlarged front views showing the engagement operation of the latch and pawl of a conventional seat recliner in the order of stages of engagement, and Figures 4 and 5 are the latch and pawl of the seat recliner of the present invention. FIG. 6 is a partially cutaway enlarged front view showing the stage of engagement with the seat recliner of the present invention. 1, 11... Latch, 2, 12... Pole, 3... Pivot, 5, 15... Toothless part.

Claims (1)

[Scope of utility model registration request] In a seat recliner for a car seat in which a seat back is pivotally attached to the seat, a latch having a series of external gear-shaped teeth arranged in an arc concentric with the pivot axis of the seat back is fixed to the seat, and the latch is attached to the seat recliner. A pawl having a predetermined number of engaging teeth in the form of an internal gear is pivotally mounted to the seat, and the pivot shaft is such that each tooth of the pawl engages or disengages with the teeth of the latch as the pawl pivots. Further, the latch is provided with an arc-shaped toothless portion following the row of teeth in such a position that the teeth of the pole are movably engaged when the seat back is tilted forward at a large angle. Further, each tooth of the above-mentioned pole increases in tooth height sequentially from the tooth closest to the axis of the pole to the tooth farthest from the axis of the pole,
Seat recliner featuring shaped teeth