JPH0450846Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for adjusting the position of the lower backrest of a seat used in a vehicle such as an automobile.

[Prior Art] In order to reduce occupant fatigue in the rear seat of an automobile, a device has been proposed that allows the position of the lower half of the seat back to be adjusted in the longitudinal direction according to the seating posture, preference, etc. For example, Utsukai Showa 63-
The seat back disclosed in Japanese Patent No. 61950 allows the amount of protrusion of the lower part of the seat back to be adjusted by operating a locking mechanism using an operating lever.

[Problems to be solved by the invention] In the above prior art, the operating lever for operating the lock mechanism must be placed in a part of the seat back, and the lock mechanism must be placed in the middle part of the seat back in the vertical direction. Therefore, when you are seated, the control lever, lock mechanism, etc. may feel like foreign objects. In particular, when the pad is made thinner in order to make the seat back thinner, the locking mechanism and the like tend to be felt as foreign objects, making it difficult to respond to the thinner seat.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a device which allows a locking mechanism to be compactly housed under the seat and which allows the position of the lower part of the seat back to be adjusted without using an operating lever.

[Means for solving the problem] In order to achieve the above purpose, the adjustment device of the present invention has the following features:
A movable frame that is pivotally attached to the seat frame so as to be rotatable in the front and rear directions around a durable shaft, a pad provided on this movable frame, and a horizontal support shaft that is rotatably supported at the bottom of the seat frame. and an interlocking member provided between the movable frame and the support shaft, which rotates the support shaft in one direction when the movable frame moves forward and rotates the support shaft in the opposite direction when the movable frame moves backward; A locking member that rotates together with the support shaft and has one or more locking portions in the circumferential direction of the support shaft, and a locking member that engages with the locking portion and a non-locking position that disengages the locking member. a movably provided ratchet; a ratchet biasing means that always presses the ratchet toward the locking position; When the locking member rotates within a predetermined angle range, the ratchet is in a stopped state, and the ratchet is maintained in the locked position, and when the locking member rotates beyond a predetermined angle, it rotates together with the locking member. and a cam member having a cam surface for displacing the ratchet to the release position.

[Operation] In the device of the present invention having the above mechanism, when the pad provided on the movable frame is pulled forward by hand, the movable frame moves forward and the support shaft rotates via the interlocking member. When the spindle rotates, the lock member also rotates in the same direction, and while the rotation angle of the lock member is small, the cam member is kept in a stopped state, and the ratchet engages with the locking part according to the rotation angle of the lock member. The movable frame is fixed by engagement.

When the lock member reaches a predetermined angle by pulling the pad further forward and further rotating the support shaft and lock member, the cam member will rotate together with the lock member, and the ratch will move along the cam surface. By moving, it is displaced to the release position. In this state, when the pad is pressed rearward, the lock member rotates in the opposite direction by a predetermined angle, and then the cam member rotates together with the lock member, and the movable frame returns to its initial retracted state.

[Example] An example of the present invention will be described below with reference to the drawings.

The seat back 1 of the automobile rear seat shown in FIG. 2 is equipped with a pair of left and right adjustment devices 2. As shown in FIG. 3, this adjustment device 2 is configured so that a cushion pad 3 that supports the vicinity of the lumbar region of a seated person can be reciprocated in the front and back direction within a stroke L range.

FIG. 1 shows the adjusting device 2 without the pad. The movable frame 5 made of a metal pipe has a substantially U-shaped shape when viewed from the front, and the sturdy parts of the movable frame 5 are pivoted so as to be rotatable in the front and back directions about shafts 6 and 7. . The shafts 6, 7 are provided on a pair of left and right upper brackets 8, 9, and these brackets 8, 9 are fixed to a seat frame 10a (only a portion of which is shown in FIG. 1).

A pair of left and right lower brackets 11 and 12 are fixed to the seat frame 10b located on the lower side. A horizontal support shaft 13 is rotatably supported between the lower brackets 11 and 12.

At both ends of the support shaft 13, interlocking members 15 and 16 are provided between the movable frame 5 and the movable frame 5. One interlocking member 15 has a pair of links 17 and 18 connected to a shaft 19.
They are rotatably connected in a dogleg shape. The other interlocking member 16 also has a pair of links 21,
22 are rotatably connected by a shaft 23 in a dogleg shape. The ends of the links 17 and 21 are
Support members 2 each fixed to a movable frame 5
5 and 26 via link pins 27 and 28, and the ends of the links 18 and 22 are fixed to both ends of the support shaft 13. Therefore, when the movable frame 5 moves forward of the seat, the support shaft 13 rotates counterclockwise in the drawing, and when the movable frame 5 moves backward, the support shaft 13 rotates clockwise in the drawing. The interlocking members 15 and 16 include links 17 and 1.
In order to prevent 8, 21, and 22 from rotating more than necessary, a stopper 29 (only one of which is shown in FIG. 4) is provided to restrict the initial rotation position (storage position).

A gear-shaped lock member 30 is fixed to one end of the support shaft 13. The lock member 30 rotates together with the support shaft 13, and has a first recess 31, a second recess 32, and a third recess 33 in the circumferential direction of the support shaft 13.
is provided. As shown in FIG. 7, etc., the second recess 32 includes a slope portion 35 whose distance from the support shaft 13 changes in a tapered shape, and a first locking portion 36 rising on the rear side of the slope portion 35. It is equipped with Third
The recess 33 also includes a slope portion 38 whose distance from the support shaft 13 changes in a tapered manner, and a second locking portion 39 rising from the rear side of the slope portion 38. A stopper pin 40 is provided protruding from the side surface of the lock member 30.

The ratchet 42 is rotatably supported on the bracket 11 by a shaft 43. Ratchet 42
has a lock position (position closer to the spindle 13) where the tip enters the recesses 31, 32, 33, and a release position (position away from the spindle 13) where the tip comes out of the recesses 31, 32, 33. It can be rotated freely. The end of the ratchet 42 has a thickness that spans the outer periphery of both the lock member 30 and a cam member 46, which will be described later.

The ratchet 42 is always pressed toward the locking position, that is, in the direction of entering the recesses 31, 32, 33, by a ratchet biasing means 44, such as a torsion spring.

The cam member 46 is rotatable with respect to the support shaft 13. The outer diameter of cam member 46 is slightly larger than the outer diameter of lock member 30. An arcuate long hole 47 is provided in the side surface of the cam member 46 at a position corresponding to the stopper pin 40, and the stopper pin 40 is inserted into this hole 47. Stopper pin 4
0 is movable by a predetermined distance in the length direction of the hole 47, that is, in the circumferential direction of the cam member 46. In other words, the cam member 46 can reciprocate relative to the lock member 30 only within the range in which the stopper pin 40 can move within the hole 47.

A recess 50 is provided on the outer periphery of the cam member 46 and is shaped so that the tip of the ratchet 42 can fit therein. This recess 50 is formed in a similar shape to the second recess 32 or the third recess 33 of the locking member 30. That is, the recessed portion 50 includes an oblique cam surface 51 and a locking portion 52 that stands up on the rear side of the cam surface 51. The recess 50 is provided in a positional relationship such that the cam member 46 can move from the first recess 31 to the third recess 33 within a range in which the cam member 46 can rotate relative to the lock member 30. There is.

These lock member 30, ratchet 42, cam member 46, etc. constitute a lock mechanism section 53.

A return spring 56 using a tension coil spring or the like is provided between the arm 55 provided at the other end of the support shaft 13 and the bracket 12. The return spring 56 urges the support shaft 13 clockwise in the figure, that is, in the direction in which the movable frame 5 is retracted.

Next, the operation of the embodiment of the apparatus configured as described above will be explained.

4 and 7 show the movable frame 5 in its retracted state. At this time, the pad 3 is in the most rearward position and is prevented from moving back any further by the stopper 29.

When the pad 3 is pulled forward by hand, the movable frame 5 rotates forward about the shaft 6, and the support shaft 13 rotates counterclockwise in the drawing via the links 17, 18, 21, and 22. When the spindle 13 rotates, the lock member 30 also rotates in the same direction, and the stopper pin 40 also moves in the same direction, but as long as the rotation angle of the lock member 30 is small, the stopper pin 40
Since the cam member 46 moves within the hole 47, the cam member 46 is maintained at rest with the ratchet 42 engaged with the recess 50. When the lock member 30 is rotated by a predetermined angle (for example, 20 degrees) due to further rotation of the support shaft 13, the ratchet 42 enters the second recess 32 as shown in FIGS. 5 and 8. In this state, the pad 3 protrudes slightly forward from the initial position. Even if a backward load is applied to the movable frame 5 when the person is seated, the movable frame 5 does not move because the ratchet 42 abuts against the first locking portion 36.

When the pad 3 is pulled further forward by hand, the support shaft 13
Further counterclockwise rotation causes further rotation of the locking member 30, so that the tip of the ratchet 42 enters the third recess 33 as shown in FIG. In this state, the pad 3 moves further forward and is locked. At this time, even if a backward load is applied to the pad 3, the movable frame 5 does not move because the ratchet 42 is in contact with the second locking portion 39. It should be noted that as the lock member 30 rotates, the stopper pin 40 also displaces by the same angle, but since the stopper pin 40 only moves within the hole 47 up to this angle, the cam member 46 does not engage the ratchet 42 in the recess 50. It remains in the stopped state. However, at this time, the stopper pin 40 is inserted into the hole 4.
7 near one end 47a.

When the pad 3 is fully pulled out to the release position on the near side, the support shaft 13 and the locking member 30 further rotate counterclockwise, so as shown in FIGS. 6 and 1.
As shown in Figure 0, the stopper pin 40 is inserted into the hole 4.
The cam member 46 rotates together with the lock member 30 by continuing to rotate while abutting against the end 47a of the cam member 7. Therefore, the tip of the ratchet 42 slides onto the cam surface 51 of the cam member 46, and as a result, the tip of the ratchet 42 comes out of the recess 33 and the recess 50, and the tip of the ratchet 42 slides onto the cam surface 51 of the cam member 46. They come into sliding contact. The angle through which the support shaft 13 rotates until this state is reached is, for example, 74°.

When you let go of Pad 3 at this release position,
Due to the elasticity of the return spring 56, the 11th
As shown in the figure, the support shaft 13 and the lock member 30 rotate clockwise, the stopper pin 40 hits the other end 47b of the hole 47, and the lock member 30 further rotates clockwise, so that the cam member 46 rotates clockwise together with the locking member 30. Therefore, as shown in FIG.
It enters the recess 50 while sliding down along the line, and finally returns to the initial retracted state shown in FIGS. 4 and 7.

According to the adjusting device 2 having the above configuration, the position of the pad 3 in the longitudinal direction can be changed from the retracted state (initial position) to the first stage → second stage → retracted state (initial position) by simply pulling out the pad 3 to a desired position. position), and the position can be adjusted in multiple stages without using an operating member such as an operating lever. and,
The lock member 30, ratchet 42, cam member 46, links 17, 18, 21, 22, support shaft 13, etc. that constitute the lock mechanism section 53 can all be accommodated near the lower end of the seat back.

[Effects of the Invention] According to the present invention, the locking mechanism can be compactly housed in the lower part of the seat, so even if the seat is made thinner, the locking mechanism will not cause a feeling of being a foreign body. The locking and releasing operations of the locking mechanism can be performed by simply pulling out the pad at the bottom of the seat back by hand, making the operation extremely simple and eliminating the need for a lever or the like.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the adjustment device without the pad, Fig. 2 is a perspective view of the rear seat, Fig. 3 is a side view of the rear seat, and Fig. 4 is a perspective view of the adjustment device without the pad.
6 through 6 are side views of the adjusting device showing different operating states, and FIGS. 7 through 12 are side views showing a portion of the adjusting device in the order of operation. 3... Padded, 5... Movable frame, 10a,
10b...Seat frame, 13...Spindle, 1
5, 16... Interlocking member, 30... Locking member, 3
6...First locking part, 39...Second locking part, 40...
...stopper pin, 42...ratchet, 44...
...Ratchet biasing means, 46...Cam member, 47
...hole, 53...lock mechanism section.

Claims (1)

[Scope of Claim for Utility Model Registration] A movable frame pivotably attached to a seat frame so as to be rotatable in the front and rear directions about an upper shaft, a pad provided on the movable frame, and a pad rotatably attached to the bottom of the seat frame. a supported horizontal spindle, and a spindle provided between the movable frame and the spindle, which rotates the spindle when the movable frame moves forward and rotates the spindle in the opposite direction when the movable frame moves backwards. an interlocking member to be rotated;
A locking member provided with locking portions at more than one point, a ratchet provided movably between a locking position where it engages with the locking portion and a non-locking position where it disengages, and the ratchet always being locked. a ratchet biasing means for pressing toward a position; a ratchet biasing means rotatably attached to the support shaft and rotatable relative to the locking member only within a predetermined angular range; a cam surface that is in a stopped state when rotating within the locking member, maintains the ratchet in the locked position, and rotates together with the locking member to displace the ratchet to the release position when the locking member rotates by a predetermined angle or more; A seatback adjustment device comprising: a cam member having the following features: