JPH0568354U - Seat lumbar support adjustment device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is easy to adjust the pressing force of the lumbar plate that presses the lumbar vertebra of the seated person on the seat, and
Make fine adjustments possible at a fine pitch. [Structure] As a mechanism for adjusting the pressing force of the lumbar plate 3 arranged in the backrest portion 1b of the seat 1 against the lumbar support portion, a large number of sawtooth engagement portions 15a and 15b are provided.
The sector plate 15 having the above-mentioned structure is fixed to the seat back frame 2, and engaging claws 18a, which can be engaged and disengaged with the engaging portions 15a, 15b of the sector plate 15,
The lock mechanism 6 is provided with the lock plate 18 having 18b.
And the lock plate 1 in the lock mechanism 6
The engagement / disengagement operation of the locking claws 18a and 18b of No. 8 and the operation of the link mechanism 4 which controls the swing displacement of the lumbar plate 3,
The lumbar plate 3 is provided with a linkage mechanism 7 for linking the rotation of the lumbar lever 5 arranged on the side of the backrest portion 1b.
Is configured to be adjustable in multiple stages.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lumbar support adjusting device for a seat, which is used, for example, when it is mounted on an automobile seat or the like to reduce fatigue in the buttocks or the lumbar region due to long-term driving in a fixed sitting posture. The present invention relates to a lumbar support adjusting device for a seat, which is configured to displace a lumbar plate arranged at a position corresponding to the lumbar support of a seated person in the backrest of the seat.

[0002]

[Prior Art]

 As a lumbar support adjusting device for a seat of this type, as disclosed in Japanese Utility Model Laid-Open No. 54-119806, a screw shaft is provided via a rotary operation handle arranged on the side of the backrest. By rotating the screw shaft in the forward and reverse directions, the screw shaft is rotated and moved in the axial direction, and along with the movement of the screw shaft, the support arm of the lumbar plate is swung around the fulcrum, and the lumbar spine support part is rotated. It is known to displace the lumbar plate in the direction in which the pressing force on the is changed.

As another conventional example, as disclosed in Japanese Utility Model Laid-Open No. 51-107721, the knob arranged on the side of the backrest is rotated to rotate the polygonal cam. There is also known a configuration in which the lumbar plate supporting leaf spring is pivotally displaced about an axis via another cam so that the pressing force of the lumbar plate against the lumbar support portion can be changed.

[0004]

[Problems to be solved by the device]

 Among the above-mentioned conventional lumbar support adjustment devices for seats, in the former rotary screw type structure, when adjusting the pressing force on the lumbar support by the lumbar plate, it is necessary to rotate the handle many times, The adjustment itself is troublesome and cumbersome, and with the latter cam-type structure, the adjustment range of the pressing force on the lumbar support is roughly a few steps due to problems such as cam structure and strength. There was a drawback that it was restricted by.

The present invention has been made in view of the above situation, and an object thereof is to provide a lumbar vertebra support adjusting device for a seat, which can be easily adjusted and can be finely adjusted.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a seat lumbar support adjusting device according to the present invention corresponds to a seat back frame inserted into a seat back portion and a seat lumbar support portion of a seated person in the seat back portion. A lumbar plate disposed at a position where the lumbar plate is supported, a link mechanism that supports the lumbar plate on the seat back frame in a direction that changes the pressing force of the lumbar plate against the lumbar support, and the backrest. A lumbar lever rotatably arranged on the side of the seat, and a sector fixed to the seat back plate and having a large number of engaging portions on the circumferential line around the rotational axis of the lumbar lever. A lock including a plate and a locking claw that is engageable with and disengageable from the engaging portion of the sector plate and is biased in the engaging direction via a spring. And with the rotation of the lumbar lever, the locking claw of the lock plate is disengaged from the engaging portion of the sector plate against the urging force, and after the disengagement, the lumbar plate is moved through the link mechanism. And a linkage mechanism for swinging displacement.

[0007]

[Action]

 According to the above configuration, normally, the locking claw of the lock plate is engaged with one engagement portion of the sector plate by the biasing force of the spring, and the link mechanism and the lumbar plate are fixed, The pressing force on the lumbar support is kept constant. In this state, simply by rotating the lumbar lever arranged on the side of the backrest back and forth, the locking claw of the lock plate first acts against the biasing force of the spring through the linkage mechanism. While being disengaged from the engaging portion, the link mechanism operates in the rotational operating direction of the lever lever, and the lumbar plate swings and displaces in a direction that changes the pressing force applied to the lumbar support. Here, since a large number of engaging portions are formed closely on the periphery of the sector plate, it is possible to make a fine adjustment while widening the adjustment range of the pressing force.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing a lumbar vertebra support adjusting device for a seat of an automobile or the like according to an embodiment of the present invention, and FIG. 2 is a partially cutaway front view, in which FIG. 1 is a seat part. The seat 1a and the backrest 1b are covered with a cushioning outer skin 1c. A seat back frame 2 formed by bending a metal pipe into a rectangular shape is inserted in the backrest portion 1b, and at a position corresponding to a lumbar spine supporting portion of a seated person sitting on the seat portion 1a. A lumbar plate 3 is arranged in the backrest portion 1b, and the lumbar plate 3 is swung with respect to the seat back frame 2 in a direction to change the pressing force of the backrest portion 1b against the lumbar support portion. A pair of left and right link mechanisms 4 that are displaceably supported, a lumbar lever 5 disposed on one side of the backrest 1b, and a lock mechanism 6 that maintains the swing displacement of the link mechanism 4 and the lumbar plate 3 fixed. The linkage mechanism 7 is provided in the backrest portion 1b.

FIG. 3 is an exploded perspective view of a main part showing the structure of each of the mechanisms 4, 6 and 7 in detail, and FIG. 4 is an enlarged view of the main part with the respective mechanisms 4, 6, 7 assembled. FIG. 3 is a side view showing that the link mechanism 4 is rotatably fitted to the shaft 9 that is fixed to the left and right frame portions 2a of the seat back frame 2 via brackets 8 and protrudes inward. The shaft bush 10 has two links 4A and 4B which are fixed to both ends in the axial direction of the shaft bush 10 and protrude in different directions, of which one of the links 4B is laid between the free ends. The lumbar plate 3 is fixed to the stabilizer 11 via the set bracket 12, and the space between the middle portion of the other link 4A and the left and right frame portions 2a of the seat back frame 2 is A coil spring 13 for rocking and biasing the lumbar plate 3 forward, that is, in a direction that strengthens the pressing force of the lumbar spine support portion in the backrest portion 1b (direction of arrow a) and holding the lock mechanism 6 in the locked state. It is stretched.

The lock mechanism 6 is fixed to one frame portion 2 a of the seat back frame 2 and is provided at a peripheral edge on a circumferential line whose center is the shaft center of the lever shaft 14 directly connected to the lumbar lever 5. A sector plate 15 formed by forming a large number of sawtooth-shaped engaging portions 15a and 15b in both forward and reverse directions, and the sector plate 15 around the fulcrum pin 16 with respect to the sawtooth-shaped engaging portions 15a and 15b. The lock plate of the lock mechanism 6 is composed of a scissor-type lock plate 18 that is engageable and disengageable by rotation and that has locking claws 18a and 18b that are urged in the engagement direction via a spring 17. A recess 18c is formed near the fulcrum of 18 to which a lock releasing kick pin described later is fitted.

Further, the linkage mechanism 7 has a link 20 whose one end is connected to the free end of one of the links 4 A of the link mechanism 4 via a pin 19, and a pin at the free end of the link 20. An arm 22 having a substantially isosceles triangular shape, which is connected via 21 and which supports the fulcrum pin 16 of the lock plate 18 and is fitted and supported so as to be swingable around the axis of the lever shaft 14. The kick plate 23 fixed to one end of the lever shaft 14 and projected, and the lever shaft 14 axial center formed on the arm 22 and projected from one end of the kick plate 23 toward one side The kick pin 24 is inserted into the surrounding long hole 22a and fitted into the recess 18c of the lock plate 18, and is used for rotation of the lumbar lever 5. Accordingly, the lock plate 18 is rotated around the fulcrum pin 16 via the kick pin 24 so that one of the locking claws 18a and 18b resists the biasing force of the spring 17 and the engaging portion 15a, 15b is separated from one side, and the other side is brought into a sliding contact state, and after the separation, the lumbar plate 3 is swingably displaced around the shaft 9 via the arm 22 and the link mechanism 4.

In the figure, 25 is a set plate for supporting the lateral portions of the upper body, and 26 is a hinge plate for making the angle of the backrest 1b relative to the seat 1a adjustable. It is attached to the lower end of one frame 2a of the seat back frame 2.

Next, the operation of the above configuration will be described. Normally, the locking claws 18a, 18b of the lock plate 18 in the lock mechanism 6 are engaged with one selected engaging portion 15a, 15b of the sector plate 15 by the biasing force of the spring 17, as shown by the solid line in FIG. The lumber plate 3 is fixed in a fixed posture via the arm 22, the link 20 and the link mechanism 4 of the linkage mechanism 7 because the locked state is maintained, and the pressing force against the lumbar support is maintained constant. Has been done.

In this state, when the lumbar lever 5 arranged on the side of the backrest 1b is rotated back and forth, the kick plate 23 of the linkage mechanism 7 swings around the axis of the lever shaft 14, Along with the swinging, first, the kick pin 24 moves in the long hole 22a, for example, in the direction of the arrow b to rotate the lock plate 18 around the fulcrum pin 16 so that the locking claw 18a resists the urging force of the spring 17. , It is disengaged from the engaging portion 15a of the sector plate 15.

At this time, the arm 22 does not swing yet. After the locking claw 18a is disengaged from the engaging portion 15a and the lock is released, the kick pin 24 comes into contact with the inner peripheral edge of the elongated hole 22a, so that the arm 22 moves as the lever shaft 14 swings. Oscillates around the axis of the lever shaft 14 by the tensile force of the coil spring 13, and the oscillating movement is transmitted to the link mechanism 4, and the lumbar plate 3 is moved around the shaft 9 via the link mechanism 4. The oscillating displacement causes the pressing force of the backrest portion 1b against the lumbar support portion to be oscillated and urged in the direction of arrow a, which strengthens the pressing force of the lumbar support portion.

On the other hand, when the lumbar lever 5 is rotated in the other direction, the kick pin 24 moves in the elongated hole 22a, for example, in the direction of the arrow c, so that the locking claw 18b resists the biasing force of the spring 17. , The sector plate 15 is disengaged from the engaging portion 15b. After the locking claw 18b is disengaged from the engaging portion 15b and the lock is released, the kick pin 24 abuts on the inner peripheral edge of the elongated hole 22a, so that the arm 22 moves as the lever shaft 14 swings. Swings around the axis of the lever shaft 14 against the tensile force of the coil spring 13, and the swing is transmitted to the link mechanism 4, and the lumbar plate 3 rotates around the shaft 9 via the link mechanism 4. When the backrest portion 1b is oscillated and displaced, the pressing force of the backrest portion 1b against the lumbar support portion is adjusted in the direction of arrow d, which weakens the pressing force of the lumbar support portion. The force that resists the tensile force of the coil spring 13 is performed by the lumbar vertebrae of the human body.

As described above, the pressing force of the lumbar plate 3 against the lumbar spine supporting portion can be easily adjusted only by rotating the lever shaft 14 in a narrow range, and at the same time, the pressing force formed on the sector plate 15 can be adjusted. By adopting a latch-type lock structure composed of the joint portions 15a and 15b and the locking claws 18a and 18b, the number of steps for adjusting the pressing force can be increased and fine adjustment can be performed.

[0018]

[Effect of the device]

 As described above, according to the present invention, the lever-type operation mode and the latch-type pressing force adjusting mechanism are synergistic, so that even in a relatively narrow place such as an automobile interior, It has a practical effect that the adjustment operation can be performed easily and speedily with a small number of steps, and that the number of adjustment steps can be increased, the unit adjustment allowance can be reduced, and fine adjustment can be performed.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a lumbar support adjusting mechanism for a seat according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view.

FIG. 3 is an exploded perspective view of essential parts specifically showing the structure of each mechanism.

FIG. 4 is an enlarged side view of a main part with each mechanism assembled.

[Explanation of symbols]

 1 seat 1b backrest part 2 seatback frame 3 lumbar plate 4 link mechanism 4A, 4B link 5 lumbar lever 6 lock mechanism 7 linkage mechanism 13, 17 spring 15 sector plate 15a, 15b sawtooth engagement portion 18 lock plate 18a , 18b Locking claw 23 Kick plate 24 Kick pin

Claims (1)

[Scope of utility model registration request] 1. A seat back frame inserted into a backrest portion of a seat, a lumbar plate arranged at a position in the backrest portion corresponding to a lumbar support portion of a seated person, and the lumbar support of the lumbar plate. A link mechanism for supporting the lumbar plate on the seat back frame so that the lumbar plate can be swung and displaced in a direction of changing the pressing force applied to the seat portion, a lumbar lever rotatably arranged on a side portion of the backrest portion, and the seat. A sector plate fixed to the back frame and having a plurality of engaging portions on its peripheral edge on a circumferential line centered on the axis of rotation of the lumbar lever, and detachable from the engaging portion of the sector plate. And a lock plate having a locking claw biased in the engaging direction via a spring, and the lock plate according to the rotation of the lumbar lever. And a linkage mechanism that disengages the locking claw from the engaging portion of the sector plate against the biasing force and swings and displaces the lumbar plate via the link mechanism after the disengagement. Lumbar support adjustment device.