JP5480000B2 - Vehicle seat back - Google Patents

Description

  The present invention relates to a vehicle seat back, and more particularly to a seat back used for a rear seat of a vehicle having two rows of seats at the front and rear.

  Generally, a seat back used for a rear seat of a vehicle has a frame-like portion as described in Patent Document 1 below. The frame portion constitutes a main portion of the seat back frame, and is formed in a substantially rectangular frame shape by bending a metal pipe material. Two support members are coupled to the lower left and right corners of the frame-like portion so as to be rotatable about a horizontal axis extending in the left-right direction. By fixing the two support members to the floor of the vehicle, the frame-like portion is provided so as to be pivotable about a horizontal axis extending in the left-right direction, and the seat back frame is thus located between the use position and the forward-turned position. Is provided to be rotatable. When the seat back frame is rotated to the use position, a lock mechanism provided between the seat back frame and the vehicle body automatically locks the seat back frame to the use position. When the lock state by the lock mechanism is released, the seat back frame can be rotated to the forward position.

  Another conventional vehicle seat back is shown in FIG. The seat back A has a frame-like portion B made of a metal pipe material. This frame-shaped part B forms the main part of the seat back frame, and the right end part of the shaft body C extending in the left-right direction is fixed to the lower left corner part thereof by welding or the like. A support member (not shown) is rotatably and detachably attached to the left end protruding from the frame-like part B of the shaft body C. On the other hand, another support member (not shown) is connected to the lower right corner of the frame-like part B so as to be rotatable about a horizontal axis. And both frame members B (seat back frame) are provided in the floor so that it can be moved forward by fixing both support members to the floor of the vehicle.

JP 2007-314061 A

In the thing of patent document 1, when fixing one support member to a floor part, not only the seat back frame can rotate with respect to the said support member but it is located in the other support member side. The side part of the seat back frame can be freely moved in the front-rear direction. For this reason, when fixing the said one supporting member to a floor part, you have to perform fixing work, hold | suppressing rotation and movement of a seat back frame, and there is a problem that a great difficulty accompanies that work. there were.
When the other support member is fixed to the floor, it is necessary to suppress the rotation of the seat back frame. In this case, the side portion of the seat back frame located on the one support member side is The position is fixed by the support member. Therefore, when the other support member is fixed to the floor, it is only necessary to suppress the rotation of the seat back frame, and it is not necessary to suppress the movement. Therefore, the other support member can be fixed relatively easily.

  On the other hand, when the seat back A shown in FIG. 5 is installed on the floor of the vehicle, first, one support member that rotatably supports the shaft body C is fixed to the floor. At this time, the support member is detached from the shaft body C and is fixed to the floor portion alone. Therefore, the one supporting member can be easily attached to the floor. Next, the shaft body C is rotatably attached to the one support member. Then, the other support member provided in the frame-like body is attached to the floor. At this time, it can be attached to the floor in the same manner as the other support member described in Patent Document 1. Therefore, both supporting members can be easily fixed to the floor.

  However, in the seat back shown in FIG. 5, the lower corner portion of the frame-shaped portion B to which the shaft body C is fixed is curved in an arc shape. It will be on the right side of 5. For this reason, the distance l between the fixed end E to the seat back frame B of the shaft body C and the support portion F of the shaft body C by the support member becomes long. As a result, there has been a problem that the support strength of the shaft C against the frame B (seat back) is reduced.

The present invention was made to solve the problems of the conventional vehicle seat backs at once, and is formed by bending a metal pipe material and fixing both ends of the pipe material to each other. A seat back frame having a substantially rectangular frame-shaped portion, and two support members provided at the lower left and right corners of the frame-shaped portion so as to be rotatable about a rotation axis extending in the left-right direction, respectively. In the vehicle seat back in which left and right support members are attached to the floor of the vehicle, whereby the seat back frame is provided on the floor so as to be rotatable about the rotation axis, both ends of the pipe member are One end portion extending in the horizontal direction of both ends of the pipe member extends in the up-down direction, and is fixed in a state of being overlapped in the front-rear direction at one lower corner portion of the frame-shaped portion. Projecting from the other end of the frame to the outside of the frame-like portion, and the proximal end of the shaft body with the axis line oriented in the left-right direction protrudes from the one end of the pipe member in the horizontal direction. The support member, which is attached in a state of being attached, is attached to the distal end portion of the shaft body so as to be detachable and turnable.
In this case, the portions of the pipe material overlapping in the front-rear direction are crushed in the front-rear direction, thereby forming flat portions opposed to each other in the front-rear direction at both ends of the pipe material. The vehicle seat back according to claim 1, wherein both ends of the pipe member are fixed by welding while being in contact with each other.

When attaching the vehicle seat back of the present invention having the above-described characteristic structure to the floor of the vehicle, first, one support member that rotatably supports the shaft body is attached to the floor of the vehicle. At this time, the one supporting member can be attached to the floor portion in a state where it is removed from the shaft body, that is, in a state where the seat back frame is removed. Therefore, it can be easily attached to the floor. Next, the shaft body is rotatably attached to one support member, and one side portion of the seat back frame in the left-right direction is supported by the one support member. Thereafter, the other support member is attached to the floor of the vehicle. About the other support member, it can be easily attached to a floor part like the other support member of the conventional seat back. Therefore, both support members can be easily attached to the floor.
In addition, among the ends fixed to each other of the pipe material constituting the seat back frame, the base end portion of the horizontal shaft body is fixed to one end portion extending in the horizontal direction, and the pipe material to which the shaft body is fixed is fixed. One end portion extends outside the seat back frame beyond the other end portion extending in the vertical direction of the pipe member. Therefore, the fixed part of the shaft body to the frame-shaped part, that is, the fixed part to the one end part of the pipe material and the support part of the shaft body by the support member, the one end part of the pipe material extends beyond the other end part. You can approach as much as you can. That is, the distance between the fixed part of a shaft body and a support part can be shortened. Therefore, the support strength of the shaft body with respect to the seat back frame can be improved.

FIG. 1 is a front view showing an embodiment of a vehicle seat back according to the present invention in a state where a seat back cushion is omitted. FIG. 2 is a right side view of the same embodiment. FIG. 3 is a left side view of the same embodiment. 4 is an enlarged cross-sectional view taken along line XX of FIG. FIG. 5 is a front view showing a schematic configuration of an example of a conventional seat back.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 4 show an embodiment of the present invention. The vehicle seat back 1 of this embodiment includes a seat back frame 2, a shaft body 3, a right support member 4, and a left support member 5 as main components.

  The seat back frame 2 has a frame-shaped portion 21. The frame-shaped portion 21 is made of a metal pipe material having a circular cross section, and the pipe material is bent at three locations, and one end portion 21a extending rightward and the other end portion 21b extending downward are formed at the lower right corner portion. By overlapping in the front-rear direction, it is formed in a substantially rectangular frame shape. Both end portions 21a and 21b of the pipe material may be overlapped at the lower left corner. Moreover, although the one end part 21a extended in a horizontal direction is arrange | positioned in the front side with respect to the other end part 21b extended in an up-down direction, you may arrange | position in the back side.

  As shown in FIG. 4, one end portion 21a of the pipe material is formed in a semicircular cross section by being crushed in the front-rear direction, and the flat surface portion 21c is connected to the other end portion 21b side (in this embodiment, the vehicle Facing backward). The other end portion 21b of the pipe material is also crushed into a semicircular cross section, and the flat surface portion 21d is opposed to the flat surface portion 21c. And both ends 21a and 21b are fixed by welding in a state where the flat portions 21c and 21d are in contact with each other. The both end portions 21a and 21b may be fixed by other fixing means, for example, bolts and nuts penetrating the both end portions 21a and 21b in the front-rear direction. The front end portion of one end portion 21a is positioned on the same plane as the front portion of the other portion of the frame-like portion 21 by crushing both end portions 21a and 21b overlapped in the front-rear direction in a semicircular shape. As a result, the entire front surface portion of the frame-shaped portion 21 is configured to be located on one plane.

  A panel 22 is fixed to the back surface portion of the frame-shaped portion 21 configured as described above. The panel 22 is made of metal or hard resin, covers a seat back cushion (not shown) provided on the seat back frame 2 from the rear, and supports the central portion of the seat back cushion. The panel 22 is not necessarily provided, and a spring (not shown) that supports the seat back cushion may be provided between the left and right side portions of the frame-like portion 21. In that case, a plurality of springs are used, and the springs are arranged apart from each other in the vertical direction.

  As shown in FIG. 1, one end portion 21a of the pipe material constituting the frame-shaped portion 21 is protruded to the outside (right side in FIG. 1) of the frame-shaped portion 21 beyond the other end portion 21b extending downward. . The shaft body 3 is fixed to the front surface portion of the one end portion 21a. As shown in FIG. 4, the shaft body 3 has a circular cross section, and is disposed horizontally with its axis L directed in the left-right direction. The shaft body 3 is welded and fixed in a state where the left end portion (base end portion) 3a is in contact with the front surface portion of the one end portion 21a of the pipe material. Here, since the one end portion 21a extends straight in the horizontal direction without being bent, the left end portion 3a of the shaft body 3 can be welded to the right end edge of the one end portion 21a. In this embodiment, The left end portion 3a is welded to the vicinity of the right end edge of the one end portion 21a. A right end portion (tip end portion) 3b of the shaft body 3 is protruded rightward from the one end portion 21a.

  As shown in FIG. 2, the right support member 4 has a support hole 4a. The support hole 4a is formed in the upper end part of the right support member 4, and is arrange | positioned horizontally with the axis line facing the left-right direction. A right end portion 3a of the shaft body 3 protruding rightward from the frame-shaped portion 21 is fitted into the support hole 4a so as to be insertable / removable and rotatable. Accordingly, the right end portion of the frame-like portion 21 and the right end portion of the seat back frame 2 are supported by the right support member 4 so as to be rotatable about the axis L. The lower portion of the right support member 4 is fixed to a floor portion (not shown) of the vehicle or attached so as to be adjustable in the front-rear direction.

  As shown in FIG. 1, the bracket 6 is fixed to the lower left corner of the frame-like portion 21. An upper end portion of the left support member 5 is rotatably connected to the bracket 6. The rotation axis of the left support member 5 is aligned with the axis L of the shaft body 3, that is, the rotation axis of the right support member 4 and the seat back frame 2. Similar to the right support member 4, the lower portion of the left support member 5 is fixed to the floor of the vehicle or attached so that the position can be adjusted in the front-rear direction. When the support members 4 and 5 are attached to the floor, the seat back frame 2 has a use position shown in FIG. 2 and FIG. It is possible to rotate between them. In the forward position, the panel 22 is almost horizontal. When the seat back frame 2 is rotated to the use position, the seat back frame 2 is locked to the use position by a lock mechanism (not shown) provided between the seat back frame 2 and the vehicle body, and the lock state by the lock mechanism is set. When released, it can be rotated from the use position to the forward position.

  When the vehicle seat back having the above configuration is attached to the floor of the vehicle, first, the right support member 4 is attached to the floor. In this case, the shaft body 3 is extracted from the support hole 41 of the right support member 4, and the seat back frame 2 is removed from the right support member 4. Therefore, the right support member 4 can be attached to the floor by itself. Therefore, the right support member 4 can be easily attached to the floor. Next, the shaft body 3 is inserted into the support hole 4 a of the right support member 4. As a result, the frame-like portion 21 and, consequently, the lower right corner of the seat back frame 2 are rotatably supported by the right support member 4. Thereafter, the left support member 5 is attached to the floor. At this time, the right support member 4 prevents the right side portion of the seat back frame 2 from moving in the front-rear direction. Therefore, it is not necessary to suppress the movement in the front-rear direction of the seat back frame 2, and it is only necessary to suppress the rotation thereof. Therefore, the left support member 5 can also be easily attached.

  Further, the shaft body 3 is welded to the vicinity of the right end edge of the one end portion 21 a of the pipe material constituting the frame-shaped portion 21. Moreover, the one end 21a protrudes rightward from the other end 21b. Therefore, the distance l between the right end edge of the welding location to the one end 21a of the shaft body 3 and the support location of the shaft body 3 by the right support member 4 can be shortened. Therefore, the support strength of the shaft body 3 with respect to the seat back frame 2 can be improved.

In addition, this invention is not limited to said embodiment, A various deformation | transformation is employable in the range which does not deviate from the summary.
For example, in the above-described embodiment, the one end 21a and the other end 21b of the pipe member having a circular cross section constituting the frame-shaped portion 21 are both crushed in a semicircular shape, but have two parallel surfaces. It may be crushed into an oval shape (oval shape). Of course, the two parallel surfaces of the end portions 21a and 21b are arranged to face each other in the front-rear direction.

  The present invention can be used for a seat back of a rear seat of a vehicle having at least two rows of seats at the front and rear.

DESCRIPTION OF SYMBOLS 1 Vehicle seat back 2 Seat back frame 3 Shaft body 3a Left end part (base end part)
3b Right end (tip)
4 Right support member (support member)
5 Left support member (support member)
21a One end part (of the pipe material constituting the frame-like part) 21b The other end part (of the pipe material constituting the frame-like part) 21c Plane part 21d Plane part

Claims (2)

A seat back frame having a substantially rectangular frame-like portion formed by bending a metal pipe member and fixing both ends of the pipe member to each other, and left and right lower corners of the frame-like portion in the left-right direction And two support members that are pivotable about an extending pivot axis, and left and right support members are attached to the floor of the vehicle, whereby the seat back frame is pivoted to the floor. In the vehicle seat back provided so as to be rotatable about an axis,
The both ends of the pipe material are fixed in a state where they are overlapped in the front-rear direction at one lower corner of the frame-shaped portion, and one end extending in the horizontal direction of the both ends of the pipe material is the other end extending in the up-down direction. The base end portion of the shaft body is projected from the portion toward the outside of the frame-shaped portion, and the end of the shaft body is projected in the horizontal direction from the one end portion of the pipe material. A vehicle seat back, wherein the support member disposed on the one side is detachably and pivotably attached to the tip of the shaft body.   The portions of the pipe material overlapping in the front-rear direction are crushed in the front-rear direction, thereby forming flat portions opposed to each other in the front-rear direction at both ends of the pipe material, and the flat portions are in contact with each other. The vehicle seat back according to claim 1, wherein both ends of the pipe member are fixed by welding in a state.

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