JP2003300430A - Vehicle seat back - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive vehicle seat back with a good appearance in which not only a holding property of a waist of a seated person can be ensured but also a comfortable seating position can be ensured by certainly supporting a shoulder part regardless of a physique of the seated person. <P>SOLUTION: In the vehicle seat back, both sides of a seat back body 1 is made to a side support part 5 continued to a central main cushion part 4 and obliquely and forwardly directed. The above side support part 5 comprises a waist support part 7 positioned at both lower sides of the central main cushion part 4 of the seat back body 1; and an upper shoulder support part 6 positioned at both upper sides of the above main cushion part 4 and capable of adjusting an angle thereof with this main cushion part 4. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat back for a vehicle such as an automobile in which both sides of a seat back body are formed in side support portions, and a shoulder portion of a seated person is held. The present invention relates to a vehicle seat back having a function of performing the following. 2. Description of the Related Art In a vehicle seat back, a side support portion for supporting a waist portion of a seat back body from both sides is formed to be harder than a central main portion, so that a seat back of a seated person is formed. What has improved the holdability of the waist is widely adopted, but especially for the support of the occupant's shoulders, depending on the physique of the occupant, movement of the occupant such as steering wheel operation is obstructed. No countermeasure was taken, and therefore, there was a problem that the vehicle still lacked a stable holding property during running. [0003] The present invention solves the above-mentioned conventional problems, and can not only ensure the holdability of the waist of the occupant, but also the shoulder portion regardless of the physique of the occupant. The purpose of the present invention is to provide an inexpensive and good-looking vehicle seat back that can provide accurate support and secure a comfortable sitting posture. [0004] A vehicle seat back according to the present invention, which has been made to solve the above-mentioned problems, has a diagonally forward-facing side support portion on both sides of a seat back body and a central main cushion portion. In the vehicle seat back described above, the side support portion is formed by a waist support portion on both lower sides of a main cushion portion in the center of the seat back body, and a main cushion portion on both upper sides of the main cushion portion. It is characterized by comprising an upper shoulder support portion whose angle is adjustable. [0005] The means for adjusting the angle of the upper shoulder support portion is not particularly limited, but a longitudinal axis pin that forms a hinge portion on both sides of a seat back frame serving as a skeleton of the seat back body. A movable plate is attached to the vertical pin so that it can be rotated forward and backward around the vertical pin. The movable plate is built in the shoulder support portion, and the movable plate is provided in the seat back body. If an angle adjustment mechanism is used, which is linked to a small motor that is operated by a switch operation of the user via a conversion mechanism that converts the rotational motion of the motor into a linear motion, the desired structure can be achieved despite the simple structure. It is preferable because the object can be achieved. Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a view showing an automobile seat back for a driver's seat. Reference numeral 1 denotes a seat back body attached to a seat cushion (not shown) via a reclining mechanism.
The two sides of the central main cushion part 4 in which the upper cushion part 2 is connected to the upper part of the lower cushion part 3 via a design line are obliquely forward-facing side support parts 5, 5 which are harder than the main cushion part 4. The point is substantially the same as that of the conventional one, but each side support part 5 includes a lower waist support part 7 projecting obliquely forward from the outside of the lower cushion part 3 and an upper cushion part of the main cushion part 4. 2 and an upper shoulder support portion 6 which can adjust an obliquely forward angle with the upper cushion portion 2 by a built-in angle adjusting mechanism 10 irrespective of the waist support portion 7. This is the main feature of the present invention. The means by which the angle of the upper shoulder support 6 can be adjusted is not particularly limited. One example of the angle adjusting mechanism 10 described above will be described in detail with reference to FIG. Reference numeral 12 denotes a seat back frame serving as a skeleton of the seat back body 1, and the seat back frame 12
A pair of upper and lower projecting pieces 13, 13 are extended at an appropriate distance from each other at the left and right positions of the upper portion of the projecting piece 13,
A vertical axis pin 14 serving as a center of rotation is provided between the movable members 13. The movable plate 11, which is built into each shoulder support section 6 and rotates the shoulder support section 6, rotates on the vertical axis pin 14. Installed as possible. Further, one end of a connecting rod 20 is connected to the base end of each movable plate 11, and when the connecting rod 20 moves forward and backward, the movable plate 11 is rotated about the above-described vertical axis pin 14. is there. The other end of the connecting rod 20 is connected to both ends of a connecting member 18 that rotates about a fulcrum 19, while the other end of the connecting member 18 is connected to a motor 1 that is activated by a switch operation.
Rotating disk 16 that rotates in both forward and reverse directions with power source 5
The eccentric position is connected to the tip of a crank rod 17 having one end attached thereto, and the rotation of the rotating disk 16 which rotates by a predetermined angle in either the forward or reverse direction by the driving of a motor is performed by the crank rod 17. And the movable plate 11 is rotated forward and backward in a reciprocating motion, whereby the shoulder support portion 6 is rotated by a predetermined amount independently of the waist support portion 7 so as to be directed obliquely forward from both sides of the upper cushion 5. It is configured to adjust the angle at which it is located. In the illustrated example, the waist support portion 7 has an obliquely forward-facing angle that is fixed. However, an angle adjustment mechanism that is driven separately from the angle adjustment mechanism 10 of the shoulder support portion 6 is incorporated. The obliquely forward angle with the cushion portion 2 may be adjustable independently of the shoulder support portion 6 described above.
As long as the angle can be adjusted independently of the lumbar support part 7, it is not necessarily separated from the lumbar support part 7, but as an integral part of the skin so that the movement is not impaired. Is also good. In such a construction, the side support portion 5 is composed of a lower waist support portion 7 and an upper shoulder support portion 6, and the upper shoulder support portion 6 is built therein. Since the angle can be adjusted by the operation of the movable plate 11 that rotates forward and backward about the hinge portion such as the longitudinal axis pin 14, as shown in FIG. Can be rotated independently to adjust the angle according to the physique of the occupant, so that the shoulder support portion 6 can support all occupants of different physiques with an accurate fit. it can. Note that the angle adjusting mechanism 10 is not limited to the above-described one described in the embodiment. For example, a threaded shaft is used in place of the above-described crank rod 17, and a connecting member 18 A female screw component such as a ball screw having a lower end axially attached thereto is screwed, and the shaft is decelerated via a gear and rotated forward and reverse by a motor 15 to swing the connecting member 18 right and left. You may do so. As is apparent from the above description, the present invention relates to a vehicle seat back in which both sides of a seat back main body are obliquely forward-facing side support portions following a central main cushion portion. A waist support portion on both sides of a lower portion of a main cushion portion in the center of the seat back body, and an upper shoulder support portion on both upper sides of the main cushion portion and capable of adjusting an angle with the main cushion portion. It is not only possible to secure the waist of the occupant, but also to adjust the distance between the shoulder support parts regardless of the physique of the occupant, regardless of the size of the occupant. The angle can be adjusted so that the distance between the shoulder supports is not hindered. Accordingly, the occupant can be properly supported on the shoulders, so that a comfortable sitting posture can be ensured. Therefore, the present invention solves the problems of this type of conventional vehicle seat back, and enables accurate support of the shoulder regardless of the physique of the occupant, thereby ensuring a comfortable sitting posture. Inexpensive and attractive vehicle seatbacks that can contribute to the development of the industry are extremely large.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an appearance of a preferred embodiment of the present invention. FIG. 2 is a schematic view showing one example of a movable plate angle adjusting mechanism used in the present invention. FIG. 3 is a plan view showing the appearance of a preferred embodiment of the present invention. [Description of Signs] 1 Seat back body 2 Upper cushion section 3 Lower cushion section 4 Main cushion section 5 Side support section 6 Shoulder support section 7 Waist support section

Claims (1)

Claims 1. In a vehicle seatback having both sides of a seatback main body as obliquely forward-facing side support portions following a central main cushion portion, the side support portion is provided at a center main portion of the seatback main body. A waist support portion on both sides of a lower portion of the cushion portion, and an upper shoulder support portion on both sides of the upper portion of the main cushion portion, the angle of which is adjustable with the main cushion portion. Characteristic vehicle seat back.