JPH066761Y2 - Lumbar support for seats - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lumbar support for a seat of a vehicle or an aircraft, and more particularly to a lumbar support for a seat with improved operability.

[Conventional technology]

Conventionally, in a seat of a vehicle or an aircraft, in order to change an appropriate position to be supported by changing a user's physique and a reclining angle of the seat, a waist of a seat back is projected from the seat surface of the user. In some cases, the lumbar support that supports the lumbar vertebra was installed inside the seat back. This lumbar support has a configuration in which the amount of protrusion and withdrawal of a pressing plate provided in the seat back is adjusted by operating an adjustment knob or lever provided in the seat back.

[Problems to be solved by the invention]

However, since the operation parts such as the adjustment knobs and levers of this type of lumbar support are mounted on the side surface or the back surface of the seat back, it is difficult to operate in a posture in which the user is seated.
Not only is it inconvenient to handle, but it has a drawback that it cannot be smoothly rotated because it has to be made small because the mounting place is restricted.

Further, when the user is seated, a load is applied to the pressing plate forming the lumbar support, so that it is difficult to move the pressing plate forward, that is, toward the waist of the user. Was.

The present invention has been made in view of the above problems, and an operating portion such as an adjustment knob or a lever is attached to the inner or outer side wall surface of an armrest or the vicinity thereof, and a pulley and a wire are attached to a driving portion and an operating portion. By configuring
It is an object of the present invention to provide a lumbar support for a seat, which is excellent in operability and allows a user to rotate the seated posture.

[Means for solving problems]

In order to achieve the above object, a seat lumbar support according to the present invention is configured such that a driving portion and an operating portion of a lumbar support provided in a seat back can be operated via a transmission means. The drive part of the lumbar support has a drive shaft capable of adjusting the push plate to move back and forth and a pulley rotatably connected to the drive shaft, and the pulley has two grooves and positions at which the grooves face each other. The operation portion pivotally installs an adjustment knob or lever formed at a predetermined position of the seat in a rotatable manner, and a pulley is integrated with the shaft portion. One groove and a concave portion located in the groove are formed, and the transmission means has spherical end portions formed at both ends of the wire in the concave portion formed in the pulley on the driving portion side. While fitting and fixing each separately, It is an summarized in that a locking portion formed in a recess formed in the serial operation unit side pulley to the middle portion of the wire in which formed by fitting and fixing.

[Action]

In the lumbar support for a seat having the above structure, when the operating portion mounted on the armrest side wall surface or in the vicinity thereof is rotationally operated in the sitting posture, the pulley connected to the operating portion is rotated, and at the same time, the pulley is wound around the pulley. The turned wire is also pulled in one direction to rotate the pulley fixed to the drive shaft of the drive part of the lumbar support, and thus the pushing and pushing operation of the lumbar support pressing plate installed in the seat back can be performed. it can. In particular, since the wire is wound around the pulley and the circular motion of the operating part is converted into the back-and-forth motion of the lumbar support, the pressing plate can be smoothly moved in and out, and its withdrawal action is finely adjusted. You can also do it.

〔Example〕

An embodiment of a seat lumbar support according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of a main part of a lumbar support for a seat according to the present invention attached to a seat. In this drawing, a seat is provided with an armrest 1 on one side or both sides thereof, and a seatback 3 is pivotally attached to a frame on which a seat bottom 2 is placed so as to be tiltable. A so-called lumbar support is provided on a waist portion of the seatback 3. 4 is installed internally. The lumbar support 4 presses the seat cushion assembly 6 with a plate-rod-shaped pressing plate 7 on the back surface of the waist of the seat cushion assembly 6 provided on the back frame 5 of various seats as shown in FIG. 2, for example. In the horizontal direction so that it can be withdrawn and retracted in the same direction, and it is also carried in the above-mentioned both-side frames with respect to the inclined guide holes 9 formed in the engaging plates 8 standing upright on both sides of the pressing plate 7, respectively. The operation pins 11 slidably projectingly provided on the rack plate 10 are slidably engaged with each other, and the rack plates 10 are meshed with a pinion 13 which is pivotally mounted on a drive shaft 12 axially provided between both side frames. Then
A pulley 14 is connected to one end of the drive shaft 12. The drive shaft 12 is the drive unit 1 of the lumbar support 4.
5 is constituted, and when the drive shaft 12 is rotated,
The pressing plate 7 is projected or retracted by an amount corresponding to the lateral displacement component of the inclined guide hole 9, so that the lumbar portion of the seat back 3 surface can be adjusted to move back and forth through the seat cushion assembly 6.

The drive part 15 of the lumbar support 4 is composed of a drive shaft 12 and a pulley 14 rotatably connected to the drive shaft 12, and is arranged on the upper or side surface of the lumbar support 4 in the seat back 3 of the seat or the like. The pressing plate 7 is moved in and out by rotating 12. As shown in FIG. 4, the pulley 14 has two grooves 16,
16 and each groove 16, 16 has a recess 17,
17 are formed at positions facing each other. These recesses 1
Reference numerals 7 and 17 are for fitting and fixing spherical end portions 19 and 19 formed at both ends of the wire 18 in the recesses 17 and 17, respectively. That is, by fitting the end portions 19 and 19 into the concave portions 17 and 17, the wire 18 is wound around the pulley 14 and the forward / backward movement operation of the wire 18 is converted into the rotation operation of the drive shaft 12. Can be transmitted. In order to prevent the end portions 19 and 19 from being separated from the pulley 14, a cover that tightly covers the periphery of the pulley 14 is covered, or the end portions 19 and 1 are
9 may be fixed in the recess 17 of the pulley 14 by screwing or the like in a fitted state.

The adjustment knobs, levers, and the like 21 that form the operation portion 20 of the lumbar support 4 are provided on the side wall surface inside or outside the armrest 1 of the seat or in the vicinity thereof. The lever 21 is accommodated and arranged in the concave step portion 22 formed on the side wall surface of the armrest 1 in the illustrated example, and the pulley 23 is arranged inside thereof.
The shaft 24 is integrated to rotate both of them at the same time. As shown in FIG. 5, the pulley 23 is provided with a single groove 25 and is formed with a recess 27 into which a locking portion 26 provided in the middle of the wire 18 is fitted and fixed. . The recess 27 is formed by the pulley 2 of the wire 18.
3 for preventing slipping on the pulley 3 and tightly winding it around the pulley 23, and the wire 1 which interlocks with the rotating operation of the pulley 23 rotated by the operation of the lever 21.
8 is a forward / backward movement operation for conversion transmission. As means for surely fixing the locking portion 26 to the pulley 23, a cover for tightly covering the periphery of the pulley 23 is covered as described above, or the locking portion 26 is fitted into the recess 7 of the pulley 23. Means such as screwing may be taken in a fixed state.

As shown in FIG. 6, the wire 18 has the locking portion 26 formed at an intermediate portion of one wire 18, and both ends thereof are provided with flexible tubes 28, 28, and a tip end thereof is provided. The end portion 19 by exposing the portion from the tubes 28, 28.
The end portion 19 and the locking portion 26 are
To the recesses 17 and 27 formed in the pulleys 14 and 23.
The wire 18 is stretched between the operating section 20 on the armrest 1 side and the drive section 15 of the seat back 3 by fitting and fixing the same to the drive section 1 of the drive section 1 on the operation section 20 side.
5 pulley 14 can be interlocked. The tubes 28, 28 are fixed with lock nuts 29 or the like at appropriate positions inside the seatback 3 and the armrest 1 at both ends. In addition, these tubes 28,
Adjustment nuts 30 and the like are screwed onto both ends of 28, and the tension of the wire 18 can be adjusted by adjusting the increase or decrease in the tightening amount of the adjustment nut 30.

In the present embodiment, the operating portion 20 is provided on the side wall surface of the armrest 1, but it may be provided near the armrest 1 such as the seat bottom 2 and the wire 18 is used as the transmission means. The wire 18 is not limited to the above-described structure as long as it can easily convert and transmit an operation.

When using the lumbar support for a seat according to the present invention, the user can rotate the operating portion such as the lever in a desired direction while seated on the seat to press the lumbar support installed in the seat back. It is possible to support the user's lumbar vertebra by causing the board to move in and out, setting an appropriate pressing plate position, and projecting the lumbar portion of the seat back from the seat surface.

[Effect of device]

Since the seat lumbar support according to the present invention is configured as described above, the lever can be easily rotated by the user in the seated posture, so that the lumbar support can be finely adjusted.

Further, since the wire is used as the transmission means, it is not affected by the reclining operation of the seat back, so that the failure rate at the time of adjusting the lumbar support is extremely reduced.

Furthermore, the wires can be easily and quickly replaced by simply engaging or disengaging the end portions and the locking portions formed on the wire with the recesses formed on the pulleys. Is extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic structure of a main part of a seat lumbar support according to the present invention attached to a seat, and FIG. 2 is a side sectional view showing a mechanism of a seat back lumbar support. The figure is a partially enlarged front view showing the positional relationship between the wire and the pulley, FIG. 4 is a partially enlarged front view showing the drive section with the wire removed, and FIG. 5 is a partially enlarged plan view showing the operation section with the wire removed. FIG. 6 is a perspective view showing a wire and a tube. 1 ... Armrest, 3 ... Seat back 4 ... Lumber support, 12 ... Drive shaft 14 ... Pulley, 15 ... Drive part 20 ... Operation part, 21 ... Lever 23 ... Pulley

Claims (1)

[Scope of utility model registration request] 1. A drive unit and an operating unit of a lumbar support provided inside a seat back are configured to be operable via a transmission means, and the drive unit of the lumbar support outputs a pressing plate. A drive shaft that can be retracted and a pulley that is rotatably connected to the drive shaft are provided, and two grooves and recesses are formed in the pulley so as to face each other. The part pivotally installs an adjusting knob or lever configured at a predetermined position of the seat so as to be rotatable, and a pulley is integrated with the shaft part. The pulley has one groove and a recess located in the groove. The transmission means fits and fixes the spherical end portions formed at both ends of the wire separately in the concave portion formed in the pulley on the drive portion side, and the operation portion side. Of the wire in the recess formed on the pulley of Seat lumbar support, characterized in that a locking portion formed between portions are those formed by fitting and fixing.