JPS61226006A - Lamber support apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a lumbar support device, and more specifically, it is used to increase the amount of change in support load at the same lumbar support point.

(Prior Art and its Problems) Ramper the Boat system is incorporated into automobile seats to change the strength of supporting the occupant's lumbar region in order to reduce fatigue and improve riding comfort during long distance drives.

An example of the Ramper the Boat device is shown in Figures 6-8.

1 is a seat back frame, 2 is a frame line, 3 is an S-shaped sea 1-y bling, and side parts 4 are attached to the frame line 2.
An end portion 6 which is fixed with a clip 5 and extends downward is supported by the seat back frame 1. γ is a bracket for attaching a seat recliner (not shown), which is fixed to the seat back frame 1 by welding and has a hole 26 in one end 8 bent inward. 10 is fixed to the seat back frame 1 with another bracket, and 1 is attached to the -F direction.
Two retaining pins 11 are fixed, and one elongated hole 1 is located near the center.
2 is provided. Reference numeral 13 denotes an adjustment member disposed on the inner side of the seat back frame 1, and a shaft 14 is fixed near the center, and the shaft 14 is pivotally supported in the elongated hole 12 of the bracket 10. The adjusting member 13 is provided with teeth 17 on the lower side that engage with the engagement pin 11 .

Reference numeral 25 denotes a hard adjustment nubring, which has one end attached to the adjustment member 13 and the other end attached to the lever 31. A handle 19 is attached to the shaft 14. A bracket 7 for attaching a seat recliner (not shown) fixed to the seat back frame 1 is provided with one hole 26 at one end 8 bent inward.

The other bracket 10 has a downwardly extending portion 27, at the end of which an inverted U-groove 28 is provided. Adjustment member 13
has a straight arm 29. 30 is a suppressing member which has a lever 31 extending upward, has a hole 32 at its upper end for receiving one end of a spring 25, and has a horizontally extending torque rod 33 inserted through its lower end and fixed thereto.

The torque rod 33 has a protruding portion 34 on the left side of the lever 31 at one end, is supported by the inverted U groove 28 of the bracket 10, the other end is also pivotally supported in the hole 26 of the bracket 7, and has a horizontal portion 35 at the center. It is bent upward into a crank shape. 3
6 is a washer fixed to the protrusion 34 of the torque rod 33, and the torque rod 33 is attached to the inverted U-shaped groove 2 of the bracket 10.
8, it limits movement in the left and right direction. 37 is pivotally supported by a horizontal portion 35 of the torque rod 33 bent into a crank shape by means of a pressing block l/-1. The hardness adjustment spring 251d is stretched between the end of the straight η arm 29 extending above the adjustment member 13 and the hole 32 at the two ends of the lever 31 of the pressing member 30.

Please refer to FIG. In the above configuration, when the handle 19 is set to weak, the tension point between the tension spring 25 and the lever 31 is at the position A, and when the occupant leans back on the seat back in this state, the suppression plate 37 However, since the spring 25 has little deflection and the generated load is small, the pressing force against the occupant's lumbar vertebrae is weak. On the other hand, rotate the handle 19 and move the top of the pin 11 to the side 17 of the adjustment member 13.
When the handle 19 is set strongly, the tension point between the lever 31 and the tension spring 25 moves from A to A'. In this state, when the occupant leans back on the seat back, the pressing plate 37 moves to the lumbar support point while receiving the tension of the spring 25. At this time, since the load generated by the spring 25 is large, the pressing force on the lumbar region of the occupant becomes strong.

By the way, as is clear from FIG. 8, when the handle 19 is rotated and the adjustment member 13 is moved to the strong position, the upper locking point of the spring 25 is drawn with the center of rotation of the torque rod 33 as its center. With respect to the trajectory r1, a trajectory r2 drawn by the upper locking point of the spring 25, which has the center of rotation of the shaft 14 as its center, moves inward of the trajectory r1 by an amount tl.

That is, when the adjustment member 13 is moved to the strong position compared to when it is in the weak position, the mounting height of the tension spring 25 is shorter by tl, and the force of the spring 25 is reduced accordingly. Therefore, the same technical problem (technical problem of the present invention) of the present invention is to solve the above-mentioned problems of the prior art.

(Technical means of the present invention and its effects) In the prior art, the axis of the handle is arranged at the center of rotation of the adjustment member to reduce the operating torque, so the center line of the tension spring and the axis of the handle are brought close to each other. ing.

For this reason, focusing on the above-mentioned problem, a drive device is arranged at the end of the adjustment member that is far from the rotation center of the adjustment member, and the tension when the adjustment member is moved to the strong position is adjusted to the center of rotation. The above-mentioned technical problem is solved using a technical means of arranging the spring near its center line. With this means, the mounting height of the tension spring can be increased without increasing the operating torque of the drive device.

(Example) The present invention will be described in detail in FIGS. 1-5, and the same components as those in the example shown in FIGS. 6-8 will be denoted by the same reference numerals, and their explanation will be omitted.

A substantially shaped support body 51 is fixed to a bracket 50 fixed to the seat pack frame 1.

An inverted U-shaped groove 28 is provided in the support body 51, and the torque rod 33 is rotatably attached to this @2B.

A sector gear 53 is formed at the end of the adjustment member 52. Adjustment member 52 is pivoted to bracket 50 by a pin 58 passing through hole 54.55.

A spring coupler 56 having a gear on its driven member is fixed to the bracket 50, and the gear 57 of the spring coupler 56 is meshed with the sector gear 53 of the adjustment member 52. The position of the pin 58 is near the position where the center line of the tension spring 25 passes when the lumbar support is made strong.

The spring coupler 56 is actuated by the handle 19 or the electric motor, and the adjustment member 52 having the sector gear 53 that meshes with the gear 57 is rotated around the pin 58 by the gear 5T, thereby adjusting the lumbar support to weak and strong positions (or to intermediate positions thereof). Select.

As is clear from FIG. 3, the engagement point between the adjustment member 52 and the tension spring 25 centering on the pin 58 is relative to the locus r1 drawn by the engagement point between the adjustment member 52 and the tension spring 25 with respect to the rotation center of the torque rod 33. The locus r2 drawn by is radially outward of the locus r. That is, in this example, the mounting height of the tension spring 25 is increased by N72, and the amount of change in the load supported by the spring 25 at the lumbar support point opening can be increased.

Next, the structure of the spring coupler 56 used in this example will be explained.

As shown in FIGS. 4 and 5, the spring coupler includes a drive member 114 having a notch 113 disposed within a case 112 supported by a bracket 50.
4 with a gap in the notch 113 formed in the driven member 1.
15 protrusions 116 are disposed, and a spring 117 is provided between the case 112 and the drive member 114 to join the inner wall of the case 112 with a frictional force. ...A shaft 119 connected to an operating means 19 such as a handle or a lever is fixed to a drive member 114, and the operating means 11
When the drive unit 114 is rotated counterclockwise by 8,
The end face of the notch of the driving member 114 engages with one end 117a of the spring 117, and the other end face of the notch engages with the other end 117b of the spring 117 when the drive member 114 rotates clockwise. As the driving member 114 rotates, the spring 117 engages with the driving member 114 and contracts, and the connection between the spring 117 and the inner wall of the case 112 is released. Thereafter, the notch 113 comes into contact with the protrusion 116 via the end of the spring 117, and the driven member 115 moves to the driving member 114.
It is rotated by.

- If the driven member 115 rotates in any direction, the protrusion 116 of the driven member 115 will come into contact with the end of the spring 117, expanding the spring 11γ and causing the spring 11
7 and the inner wall of the case 112 is increased, and rotation of the driven member 115 is prevented. The driven member 115 is thus held in place. As mentioned above, the spring coupler constitutes a two-way clutch.

A gear 57 is fixed to the driven member 115 and meshed with the sector gear 53 of the adjustment member 52. Handle 19
Alternatively, when the rotational force from the electric motor is applied to the shaft 119, the driving member 114 rotates and moves the spring 117 in the tightening direction, and this rotational force is applied to the driven member 115 and the gear 5.
7 to the sector gear 53, and the adjusting member 52
rotate around the bin 58 to select the lumbar support position. On the other hand, See! - When the force from the back is transmitted to the driven member 115 via the sector gear 53 and the gear 57, the driven member 115 moves the spring 117 in the unwinding direction, and the spring 117 is attached to the inner peripheral surface of the case 112.
Since the driven member 115 is pressed against movement of the driven member 115, the seat back will not move even if an external force is applied to the seat back.

(Effect) It is also possible to select the rotation center of the adjustment member as in the present invention and arrange the drive device at the rotation center, but in this case,
The vertical distance from the center of rotation of the adjusting member for adjusting the centerline of the tension spring becomes longer, and the ramper sabot 1/operating torque becomes larger.However, in the present invention, since the driving device is arranged at the end of the adjusting member, the driving The operating torque can be adjusted by selecting the ratio of the dimension from the point of action of the device and the adjusting member to the point of rotation of the adjusting member and the radius of rotation of the drive. In addition, in the present invention, the amount of forward movement of the suppression plate can be increased.
It becomes possible to increase the amount of change in the position of the 48th node.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the present invention, Fig. 2 is an exploded perspective view thereof, Fig. 3 is a side view seen from arrow 1 in Fig. FIG. 5 is a plan view of a spring coupler, FIG. 6 is a perspective view of a conventional lumbar support device, FIG. 7 is an exploded perspective view of the device shown in FIG. 6, and FIG. FIG. ['Effl: 1... seat back frame, 7.
50... Bracket, 25... Spring, 30... Suppression member, 31... Lever, 33... Torque rod, 52... Adjustment member, 53... Sector gear, 56... Spring Cupra.

Claims (1)

[Claims] an adjustment member that is pivotally supported by a bracket fixed to a seat back frame and has a sector gear at an end thereof; and a lever that has one end supported by the adjustment member via a tension spring and the other end of which is pivotally supported by the bracket. , a torque rod fixed to the lever and carrying a pressing plate, a drive device meshing with the sector gear, a pivot point between the bracket and the adjustment member being a rotation center of the adjustment member, and a lumbar support. A lumbar support device characterized in that the rotation center is located near the center line of the tension spring when the set position is set to strong.