JPH0734757U - Lumbar support device for automobile seats - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lumbar support device for an automobile seat capable of supporting the lumbar spine uniformly over the entire surface of the lumbar support plate. [Structure] The center portion of the lumbar support plate 11 is supported by the other end portion 12b of the torsion bar 12, which has one end portion 12a supported by the seat frame 10, and the one end portions 27a, 27b are slidably supported by the seat frame 10. By supporting the lower portion of the plate 11 by the other end portion 27c of the support arm 27, the central portion of the plate 11 is prevented from rotating around the axis.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention particularly relates to a lumbar support device for an automobile seat that supports a lumbar vertebra of a seated person.

[0002]

[Prior art]

 As shown in FIG. 4, a vehicle seat includes a seat cushion 1, a seat back 2, and a headrest 3, and a lumbar support device for supporting the lumbar spine of a seated person is incorporated in the seat back 2. Has been.

As shown in FIG. 5, in the conventional lumbar support device, the lumbar support is provided at the other end 5b of the support frame 5 in which one end 5a is supported on the upper portion of the seat frame 4 in the seat back 2. The upper portion of the plate 6 is rotatably supported back and forth, and the other end 7b of the torsion bar 7 whose one end 7a is supported by the side portion of the seat frame 4 supports the central portion of the plate 6. There is.

[0004]

[Problems to be solved by the device]

 However, as shown in FIG. 6 (B), the lumbar support plate 6 has its upper portion supported by the support frame 5 so as to be rotatable back and forth, and its central portion supported by the torsion bar 7. There is a problem that the lower part is poorly supported and, as shown in FIG. 6C, the plate 6 rotates about the axis in the central part, so that the occupant's lumbar vertebrae is also poorly supported.

Therefore, an object of the present invention is to provide a lumbar support device for an automobile seat that can uniformly support the lumbar spine on the entire surface of the lumbar support plate.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention slidably supports the central part of the lumbar support plate at the other end of the torsion bar, one end of which is supported by the seat frame in the seat back. It is characterized in that the lower end of the plate is supported so as not to rotate about an axis by the other end of a support arm whose one end is supported by the seat frame so as to be vertically movable.

The support arm is formed by being bent into a substantially U shape, and is slidably supported on the seat frame by using the pair of legs as the one end, and the connection between the legs is performed. The part can be used as the other end part and can be supported on the lower part of the plate so as not to rotate the lower part of the plate about an axis.

[0008]

[Action]

 According to the present invention, the other end of the torsion bar having one end supported by the seat frame supports the central part of the lumbar support plate, and the other end of the support arm slidably supported by the seat frame. By supporting the lower part of the plate so that it does not rotate around the axis, the central part of the plate does not rotate around the axis, and the support in the vicinity of the lumbar vertebra of the seated person is good, and the lower part of the plate The support is also good, and the upper part of the plate can also move in the anterior-posterior direction, so that the lumbar vertebra can be evenly supported on the entire surface of the plate, and the sitting feeling is improved.

[0009]

【Example】

 Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. It should be noted that parts having the same configurations and operations as those of the prior art shown in FIGS. As shown in FIGS. 1 and 2, the seat frame 10 in the seat back 2 includes an upper frame portion 10a and a lower frame portion 10b extending in the width direction, and a space between the upper frame portion 10a and the lower frame portion 10b. And a first side frame part 10c and a second side frame part 10d which are vertically extended and fixed at predetermined intervals in the width direction, and are fixed in the vicinity of the second side frame part 10d. And the third side frame portion 10e.

In the front of the seat frame 10, a vertically elongated rectangular lumbar support plate 11 is arranged between the first side frame portion 10c and the second side frame portion 10d. A large concave portion 11a having a substantially inverted T-shape is formed in the center of the front surface of 11, and small concave portions 11b and 11b are formed in the lower portion at a predetermined interval in the width direction.

The intermediate portion 12c of the generally inverted S-shaped torsion bar 12 has a second portion on the curved portion 13a of the substrate 13 fixed across the second side frame portion 10d and the third side frame portion 10e. It is rotatably supported around the vertical axis via a bush 14 in the vicinity of the side frame portion 10d.

A U-shaped bracket 16 is fixed to the base plate 13 by bolts 15 and 15 in a forward direction, and a reduction gear 18 of an electric motor 17 is fixed to the front portion of the bracket 16 by bolts 19 and 19. It is installed. As shown in detail in FIG. 3, a screw shaft 20 is provided at the output portion of the speed reducer 18, and a slide nut 21 is screwed onto the screw shaft 20.

An arm support holder 24 is connected to the slide nut 21 via a pin 22, and the upper cylinder portion 24 a of the arm support holder 24 is connected to the lower end portion of the torsion bar 12 (see FIG. 1). The left end portion 12a is inserted through the upper hole 16a of the bracket 16.

Therefore, when the screw shaft 20 rotates forward or backward by driving the electric motor 17 and the slide nut 21 moves forward or backward, the one end portion 12 a of the torsion bar 12 also moves forward or backward via the arm support holder 24. By rotating the intermediate portion 12c of the torsion bar 12 around the vertical axis, the other end portion 12b moves forward or backward, and the strength of the support can be adjusted.

The other end 12b of the torsion bar 12 is exposed to the center of the rear surface of the lumbar support plate 11, and the rear surface is covered with rivets 25, ..., 25 from the recess 11a on the front surface of the plate 11. It is supported by a guide recess 26a of a guide bracket 26 fixed to the.

A support arm 27 bent in a substantially U shape is provided, and one leg portion (right leg portion in FIG. 1) of the support arm 27 is bent leftward, and the other end portion 27 a is formed. 1. The leg portions (the left leg portion in FIG. 1) of FIG. 1 are bent to the left to form one end portions 27b, and the one end portions 27a and 27b are respectively connected to the first side frame portion 10c and the second side portion. The guide brackets 28, 28 fixed to the upper part of the sub-frame portion 10d are fitted in the vertically elongated holes 28a, 28a, respectively, and are supported slidably in the vertical direction. It should be noted that the respective one end portions 27a and 27b of the support arm 27 are respectively fitted into the longitudinal slots 28a and 28a of the guide brackets 28 and 28 fixed to the central portion of the frame 10 and can be slid in the longitudinal direction. You may support it.

The other end 27c, which is a connecting portion between the one ends 27a and 27b of the support arm 27, faces the lower part of the rear surface of the plate 11 and also has a concave portion on the front surface of the plate 11. , 29 are supported by guide brackets 30 fixed to the rear surface. In other words, the lower end of the plate 11 is supported by the other end 27c of the support arm 27. Moreover, since both sides of the lower portion of the plate 11 are supported, the central portion of the plate 11 does not rotate around the axis of the other end portion 12b of the torsion bar 12. In other words, it is stopped.

With the above structure, the other end portion 12b of the torsion bar 12 supports the central portion of the plate 11, and, in combination with the vertical slide structure of the one end portions 27a and 27b of the support arm 27, the support arm 27 is formed. Since both ends of the lower portion of the plate 11 are supported by the other end portion 27c of the plate 11, the central portion of the plate 11 is prevented from rotating and does not rotate about the axis. This improves the support of the seated person near the lumbar spine. Also, the lower part of the plate 11 is well supported, and the upper part of the plate 11 can also move in the anteroposterior direction (see FIG. 6A), so that the lumbar vertebra can be uniformly supported on the entire surface of the plate 11. , Improves the feeling of sitting.

[0019]

[Effect of device]

 As is apparent from the above description, the automotive lumbar support device of the present invention supports the central portion of the lumbar support plate at the other end of the torsion bar whose one end is supported by the seat frame, and the one end of the seat frame. By supporting the lower part of the plate so that it does not rotate around the axis by the other end of the support arm that slidably supports the part, the central part of the plate does not rotate around the axis and the lumbar vertebra of the occupant As well as supporting the lower part of the plate, the upper part of the plate can also move in the anteroposterior direction, so that the lumbar vertebra of the seated person can be evenly supported on the entire surface of the plate, and the seating feeling is improved. It will improve.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a lumbar support device of the present invention.

2A is a front view of the lumbar support device of FIG. 1, and FIG. 2B is a side view thereof.

FIG. 3 is a plan view of a main part of a support force adjusting mechanism.

FIG. 4 is a perspective view of a vehicle seat.

FIG. 5 is a perspective view of a conventional lumbar support device.

6A and 6B are schematic diagrams showing the movement of the plate of the present invention, and FIGS. 6B and 6C are schematic diagrams showing the movement of the conventional plate.

[Explanation of symbols]

2 ... Seat cushion, 10 ... Seat frame, 11 ...
Lumber support plate, 12 ... torsion bar,
12a ... one end, 12b ... other end, 12c ... middle part, 2
6, 28, 30 ... Guide bracket, 27 ... Support arm, 27a, 27b ... One end, 27c ... The other end.

Claims (2)

[Scope of utility model registration request] 1. A central portion of a lumbar support plate is supported by the other end of a torsion bar, one end of which is supported by a seat frame in a seat back, and one end of which is slidably supported by the seat frame. A lumbar support device for a vehicle seat, characterized in that the lower end of the plate is supported by the other end of the support arm so as not to rotate about an axis. 2. The support arm is formed by bending into a substantially U shape, and a pair of leg portions are slidably supported by the seat frame as the one end portions, respectively.
The vehicle seat according to claim 1, wherein a connecting portion between the legs is supported as the other end on a lower portion of the plate so as not to rotate the plate around an axis. Lumbar support device.