JPS6030092Y2 - Adjustment device for lumbar support force in seat back - Google Patents

Description

[Detailed description of the invention] The present invention is designed to adjust the lumbar support force in a seat back for a vehicle by moving the support plate at the part where the lumbar region of the seated person comes into contact with the back and forth to adjust the lumbar support force in the seat back. This invention relates to improvements in adjustment devices.

Conventional lumbar support force adjustment devices (hereinafter referred to as lumbar supports) have a structure in which the operating lever is directly attached to the seat back, so due to restrictions on the mounting position, it can only be applied to the left and right seats. Due to the structure and shape of the vehicle body, the presence of seat back and seat cushion position adjustment devices, etc., there is no room for the operating lever to be installed on the outer surface of the seat cushion, and the operation lever must be installed at the bottom of the seat back of the separate seat. Because it is provided protruding from the center side, it has the disadvantage that it cannot be used on continuous bench-type seats on the left and right, but there is a lumbar support that can also be used on semi-separate and bench-type seats. It was wanted.

The present invention meets this demand, and its configuration will be explained below with reference to the drawings.

As shown in the embodiments of FIGS. 1 and 2, the lumbar support of the present invention includes a support plate 5 and a support adjuster 4 attached to the inside of a seat back 1, and a seat cushion 2 located at a position isolated from the support plate 5 and support adjuster 4. It consists of a lever assembly 8 mounted on the outside and a single wire cable 1° that engages the two and transmits the operating force of the lever 9 of the lever assembly 8 as the rotational force of the cam 7 of the support adjuster 4. .

FIG. 2 shows an embodiment of a semi-separate seat type with an armrest 20 in the center.

The aforementioned lever assembly 8 is attached to the lower outer surface of the seat cushion 2 at a position where it will not interfere with the occupant, and the support adjuster 4 is attached to the seat back frame 3 inside the seat back 1 to adjust the position of the support plate 5. It is adjustable in the direction of the arrow, and with this configuration it can also be used for bench type seats.

The support plate 5, which takes charge of the supporting force of the lumbar vertebrae, has a seat back spring surface 17 formed on the back side of the cushion material 57 of the seat back 1 at a position supporting the lower back of the seated person, as shown in FIGS. 2 and 7. As shown in the figure, it is elastically supported within the seat back spring surface 17 via a locking spring 56,
By moving the front end 26 of the torsion spring 18, which is locked on the back surface, its position changes back and forth in the direction of the arrow in FIGS. 1 and 2, thereby changing the lumbar support force.

The lever assembly 8 includes a lever bracket plate 1 fixed to a seat cushion frame 19 as shown in FIG.
3. A lever 9 that can rotate around a lever shaft 14 fixed to the same plate 13, a rotating arm 12 that rotates together with the lever 9, and a space between one end of the rotating arm 12 and the lever bracket plate 13. Release spring 11 stretched on
The cable end 15 of the wire cable 10 is locked to the other end of the rotating arm 12.

The support adjuster 4 is assembled on a bracket plate 36 fixed to the seat back frame 3, and as shown in FIG. 7, the support adjuster 4 includes a bracket plate 30, an upper plate 46; The pressing return spring 44, the release arm plate 6, the main shaft 38, and the ratchet plate 37 that constitute the cam 7, the positioning spring 39, and the support column 28
and a torsion spring 18, the bracket plate 36 is screwed and fixed to the seat back frame 3 at the mounting screw portion 55,
8. Supports the positioning spring 39.

The upper plate 46 has a shaft neck 47 of the main shaft 38.
A shaft hole 48 into which the
A locking hole 50 for locking one end of the bracket plate 36 and a locking hole 53 into which the locking protrusion 54 of the bracket plate 36 is inserted and locked are formed.

In the illustrated embodiment, the push-back spring 44 constituting the engagement device that can be fed in increments is a spiral spring, one end of which is inserted into the locking hole 50 of the upper plate 46, and the other end is inserted into the locking arm 49 of the release arm plate 6. The release arm plate 6 is always pressed against the ratchet plate 37.

The release arm plate 6 is approximately disc-shaped, and has a round shaft hole 43 in the center that is fitted into the main shaft 38 and can freely rotate on the shaft 38. A locking arm 49 to be locked and a locking arm 45 to which the cable end 16 of the wire cable 10 is locked.
is provided in a protruding manner, and pawls 42, 42 are provided on the ratchet plate side when assembled, in the shape of a half-bent peripheral edge.

The shape of the pawl 42 is such that when the release arm plate 6 is rotated by being pulled by a wire cable 10 (to be described later), the front end side of the rotation is formed by a front end surface 58 that is a sharp flat surface facing approximately toward the center of rotation. The end side consists of a rear end surface 59 which is an arcuate surface made of a substantially circular circumferential surface of a disk.

The main shaft 38 is rotatably attached to the bracket plate 36, and the part near the attachment part is cylindrical, but the part on the upper plate 46 side beyond the vicinity of the cam surface 21 of the cam 7, which will be described later, is as shown in the illustration. , both sides are chamfered so that the cross section perpendicular to the axis is an occluded circular portion 38', and a shaft neck 47 is formed at the tip to be rotatably fitted into the shaft hole 48 of the upper plate 46. There is.

In the illustrated example, the ratchet plate 37 has a flat plate shape with four ratchets 41 protruding at equal intervals in a cross shape, and has an occluded circular plate in the center that is fitted into the occluded circular part 38' of the main shaft 38. The ratchet 41 has a substantially centripetal linear rear surface 60 that engages with the front end surface 58 of the pawl 42 of the release arm plate 6 during rotation, and a rear surface 60 of the release arm plate 6 which will be described later. Claw 4 when rotating to return
This shape has a curved front surface 61 that is inclined so that the rear end surface 59 of the rear end surface 59 of FIG.

The cam 7 that is rotated in increments has a cam peripheral surface 29 formed on a low cylindrical peripheral surface as shown in FIGS. 3 to 7, and a cam surface 21 on the end surface on the ratchet plate 37 side when assembled. A boss 25 is subsequently formed on the cam surface 21 side, and a shaft hole 33 into which the cylindrical portion and the circular portion 38' of the main shaft 38 are inserted is bored in the center. The boss 35 side is a hollow shaft hole 34.

Shallow positioning grooves 30 are formed at predetermined intervals on the cam circumferential surface 29, and the cam surface 21, in the illustrated example, consists of 2,000 inclined surfaces as shown in FIG. A peak 3-1 and a cam valley 32 are formed, and a shallow sliding groove 22 is provided in the cam peak 31 in the radial direction.

The positioning spring 39 has both ends engaged with and fixed to the bracket plate 36, slides on the cam circumferential surface 29, and is moderated when the cam 7 is rotated in increments so as to fall into the positioning groove 30 of the cam circumferential surface 29. A positioning protrusion 40 is formed of a protruding leaf spring, and together with the positioning groove of the cam circumferential surface 29 forms a moderation means.

As shown in FIGS. 3 and 7, the torsion spring 18 has a closed loop shape, and includes a coil portion 24, which is pivotally attached to a cylindrical support 28, and a spring extending from the coil portion 24. It consists of a rod 25, a front end 26 of the spring rod 25, a sliding frame 62 extending on the opposite side of the spring rod 25 and the coil part 24, and a sliding end 23 protruding from the rear end of the sliding frame 62. , the front end 26 is loosely attached to the back surface of the support plate 5 by a plate bracket 27 so as not to come off, and the sliding end 23 always slides on the cam surface 21 and falls lightly into the sliding groove 22. A sliding end 2 that protrudes in a shape and moves according to a cam surface 21.
Due to the position change in step 3, the distance between the coil part 24 and the support 28 when the coil part is loosely inserted, or between the support 28 and the bracket plate 36 in the case of the support 28 that is fixed integrally with the coil part 24. A rotational movement is performed.

When assembling the support adjuster 4, the main shaft 38 is attached to the bracket plate 36 as shown in FIG.
is rotatably mounted, and the cam 7 is attached to this main shaft 38.
, ratchet plate 37, release arm plate 6
The push-return spring 44 is locked in the locking arm 49 of the release arm plate 6 and the locking hole 50 of the upper plate 46, and the cable end 16 of the wire cable 10 is inserted into the locking arm 45 and the cable stopper 51 is inserted into the locking arm 45. The upper plate 46 is fixed to the stopper arm 52, and then the upper plate 46 is inserted into the shaft hole 48 and the shaft neck 4.
7 and the locking hole 53 and the locking protrusion 54 are inserted into the locking protrusion 5.
By caulking 4, the attachment to the bracket plate 36 is completed.

Next, the operation of the lumbar support of the present invention will be explained.

When the lever 9 shown in FIGS. 1 and 2 is rotated upward in the direction of the arrow, the rotation arm 12 rotates counterclockwise, the release spring 11 is extended, and the cable end 15 is moved toward the front of the seat cushion. .

Accordingly, the wire cable 10 is pulled, the cable end 16 moves downward as shown by the solid line arrow in FIG. 7, and the release arm plate 6 rotates clockwise as shown by the solid line arrow.

By the way, the front surface 5 of the claw 42 of the release arm plate 6
8 and the rear surface 6 of the ratchet 41 of the ratchet plate 37
0 is engaged, the ratchet plate 37 moves clockwise as shown by the arrow, and the main shaft 38 and the cam 7, which are integrally assembled with the ratchet plate 37, function as a moderation means for positioning the cam 7 in increments and rotation. The loose fitting between the positioning groove 30 and the positioning protrusion 4o is removed, and the positioning groove 30 is rotated in a clockwise direction as shown by the arrow.

During this time, the sliding end 23 of the torsion spring 18
As shown in the figure, from the cam valley 32 of the cam surface 21 to the cam peak 31
When it slides and is pushed up, the torsion spring 18
swings counterclockwise when viewed from above in Figure 7, and its front end 2
6 pushes the support plate 5 forward in the front direction of the seat back.

The increment feed rotation angle of the cam 7 is such that the positioning protrusion 40 of the positioning spring 39 serving as a moderation means
This can be detected by the feeling of a slight movement when the positioning groove 30 is lightly fitted into the next positioning groove 30 .

In the illustrated example, this rotation angle is 900 degrees.

When the lever 9 is released and the rotational force applied to the lever 9 becomes zero, the lever 9 returns to its original free position by rotating clockwise due to the elasticity of the release spring 11, and the wire cable 10 also returns to its original free position. In order to return to the position, the release arm plate 6 is also rotated counterclockwise as shown by the broken line arrow in FIG. 7 by the restoring force of the pushing return spring 44.

During this time, the rear surface 59 of the pawl 42 and the front surface 61 of the ratchet 41 of the ratchet plate 37 slide, and the release arm plate 6 rotates while separating from the ratchet plate 37 against the pressing force of the pressing return spring 44. At the position where the pawl 42 and the chuck 41 are no longer slid together, the lathe arm plate 6 is again pressed against the ratchet plate 37, which has been fed in increments as described above, by the pressing force of the pressing return spring 44.

During the return movement, the cam 7 does not rotate due to engagement with the positioning spring 39, and therefore the main shaft 38 and the ratchet plate 37 also do not rotate.

Next, when the lever 9 is rotated upward again, the cam 7 is rotated clockwise by a predetermined angle in the same manner as described above, and the sliding end 2
3 slides and moves from the cam crest 31 to the cam valley 32, the torsion spring 18 swings clockwise when viewed from above in FIG. 7, and as a result, the support plate 5 retreats.

Thus, in the illustrated example, each time the lever 9 is pulled up once, the cam 7 rotates 90 degrees clockwise, and the support plate 5
The forward and backward movements of the support plays 1-5 are repeated, and one rotation of the cam 7 causes two cycles of the support plays 1-5 to move forward and backward.

Note that the shape of the cam surface 21 is not limited to one composed of two planes, and may be composed of an appropriate waveform curved surface. It is also possible to realize multi-stage adjustment of the lumbar support so that one cycle of , small forward movement, small forward movement, large forward movement, and backward movement is performed.

The occluded shape of the main shaft 38 is not limited to the illustrated example; the main shaft 38, the cam 7, and the ratchet plate 37 are integrally connected, and the release arm plate 6 is freely rotated on the main shaft 38. It may have any shape as long as it can move.

Further, the cam surface 21 can also be provided on the cam peripheral surface.

The torsion spring 18 is attached to the support plate 5
When a backward pressing force is applied to the front of spring rod 2,
5 also takes charge of the cushioning effect of bending.

Since the present invention has the configuration described in the claims of the utility model registration, the lever assembly can be installed at any position isolated from the support adjuster, and the lumbar support can be installed not only in a separate sheet but also in a semi-separate sheet. It can also be installed on seats and bench-type seats, and even in these seats, the lumbar support force can be improved by moving the support plate back and forth and adjusting the elastic force of the seat spring built into the seat back. This is an excellent idea that can adjust the seating comfort to match the preferences of the occupants and reduce fatigue during long hours of driving.

[Brief explanation of drawings]

FIG. 1 is a side view with a part of the seat back opened in longitudinal section showing the relative positions of the constituent parts of the embodiment; FIG. 2 is a perspective view with a part of the seat cover of the seat back shown in the embodiment opened;
Fig. 3 is a partial perspective view showing the relationship between the cam and torsion spring of the embodiment, Fig. 4 is a plan view of the cam, and Figs. 5 and 6 are views of the cam as seen from above and from the FIG. 7 is a partially exploded and omitted perspective view showing the relationship between the constituent parts. 1... Seat back, 2... Seat cushion, 3... Seat back frame, 4...
... Support adjuster, 5 ... Support plate, 6 ... Release arm plate,
7...Cam, 8...Lever assembly,
9... Lever, 10... Wire cable, 18... Torsion spring, 21...
...Cam surface, 23...Sliding end, 26...
・・Front end, 28 ・・・Post, 30 ・・・Positioning groove, 37 ・・・Ratchet plate, 38
...Main shaft, 39...Positioning spring, 40...Positioning protrusion, 41
...Ratchet, 42...Claw.

Claims (1)

[Scope of utility model registration request] A seat having a seat back and a seat cushion includes a support plate that is built into the seat back and supports and presses the back surface of an occupant, one end of which is latched to the support plate, and the other end of which is a sliding end. The cam includes a torsion spring whose intermediate portion is pivotally supported by the seat back, and a cam surface that slides in contact with the other sliding end of the torsion spring to change the biasing force of the torsion spring against the support plate. The cam includes a cam having a plurality of locking portions on a surface of which the sliding end of the torsion spring is slidably locked, and a lever for rotating the cam with respect to the seat back. Features a device for adjusting the lumbar support force in the seat back.