JP4399719B2 - Automotive seat with light alloy frame with lumbar support - Google Patents

Description

  The present invention relates to an automobile seat having a seat back frame formed of a light alloy for the entire frame as a base frame and a lumbar support for supporting a waist of a seated person in the frame of the seat back frame.

  2. Description of the Related Art Conventionally, it is known to assemble a seat back for an automobile seat by using a seat back frame in which the entire frame is formed in a substantially quadrangular frame shape from a recyclable light alloy such as magnesium and aluminum (Patent Document 1).

  Further, the flexible plate is hung from the left and right vertical bars, and the left and right vertical bars are pulled by springs on both sides of the seat back frame to stretch the flexible plate in the frame of the seat back frame. For this reason, it is also known that a flexible plate is provided in the seat back as a lumbar support (Patent Document 2).

  The lumbar support has a cable wire that extends from the center of the back of the flexible plate toward the upper part of the seatback frame downwardly from the upper part and extends to the inside of one side part. It connects with a device, and it is comprised so that a flexible plate may be stretched forward by pulling with a cable wire.

  When the lumbar support is provided in the frame of a seat back frame formed from a light alloy, at least an installation surface for attaching a cable wire traction device is provided inside one side part, and the cable wire is fixed inside the upper part. It is necessary to provide a clip insertion hole on the plate surface of the upper portion.

  When the above-described configuration is adopted and the driver seat and the assistant seat are assembled, the cable wire pulling device is attached to the left and right side portions of the seat back frame of the driver seat and the assistant seat. In addition, the clip insertion hole needs to be provided on the right side or the left side of the plate surface of the upper portion from the positional relationship of the traction device.

When the seat back frames for driver seats and assistant seats are individually molded from light alloys, not only the mold cost increases but the cost of the product becomes high, and the production and inventory numbers are managed. It becomes complicated.
JP 2001-114004 A JP 2003-164353 A

  The present invention is based on a seat back frame in which the entire frame is formed from a light alloy into a substantially quadrangular frame shape, and is used for driver seats and assistant seats regardless of whether the lumbar support is provided in the frame of any seat back frame. Therefore, it is an object of the present invention to provide an automobile seat with a light alloy frame with a lumbar support that can easily manage the production number, the inventory number, etc. without incurring high costs.

The present invention is based on a seat back frame in which the entire frame is formed of a light alloy into a substantially quadrangular frame shape,
The flexible plate is hung on the left and right vertical bars, and the left and right vertical bars are spring-tensioned on both sides of the seat back frame, and the flexible plate is stretched in the frame. The cable wire from the approximate center toward the upper part of the seat back frame is fixed to the inside of the upper part with a clip, curved downward from the upper part, extended to the inside of one side part, and installed inside the one side part In a vehicle seat provided with a flexible plate that can be pulled forward by pulling with a cable wire as a lumbar support because it is connected to a cable wire traction device
The plate of the upper part that forms the entire frame including the installation surface of the traction device symmetrically with respect to the vertical center line, and the fitting hole of the clip that can be used alternatively is equidistant from the vertical center line The seat back frame provided on the surface is assembled to the base frame.

  In a vehicle seat using a light alloy frame with a lumbar support according to the present invention, the lumbar support traction device can be attached to either the left or right side portion of the seat back frame, and the wire cable is located closer to the left or right side of the upper plate surface. Since it can be clipped in any case, the seat back frame can be used for both driver seats and assistant seats, and there is no need to mold them separately, so there is no cost increase and the number of products produced and inventory can be easily managed. .

  The illustrated embodiment shows a seat back frame for assembling a seat back of an assistant seat as an automobile seat. In the configuration, “upper”, “lower”, “right”, and “left” are used in directions based on the sitting posture of the seated person.

  The seat back frame 1 is formed into a quadrilateral frame shape by die casting or injection molding of a light alloy such as magnesium and aluminum, preferably a lightweight and recyclable magnesium alloy, as shown in FIG. ing.

  The lumbar support 2 is assembled in the frame of the seat back frame 1 with the seat back frame as a base frame. The lumbar support 2 is provided with a traction device 4 connected to the cable wire 3 attached to the right side of the seat back frame 1. A seat side airbag module (not shown) is attached to the left side of the seat back frame 1 facing the vehicle body panel.

  As shown in FIG. 2, the seat back frame 1 is formed in a substantially quadrangular frame shape from the upper portion 10, the left and right side portions 11 and 12, and the lower portion 13. The seat back frame 1 is formed such that the entire frame including the upper portion 10, the left and right side portions 11, 12 and the lower portion 13 has a bilaterally symmetric shape with respect to the vertical center line X (axis intermediate omitted). .

  The upper portion 10 is formed of a top plate 10a that projects forward including both arc-shaped shoulders, and a back plate 10b that extends from the rear edge of the top plate 10a into the frame. The left and right side portions 11 and 12 are formed of side plates 11 a and 12 a that are continuous from the top plate 10 a of the upper portion 10, and edge plates 11 b and 12 b that are continuous from the back plate 10 b of the upper portion 10. The lower portion 13 is formed in a wide plate shape that is flush with the edge plates 11b and 12b of the side portions 11 and 12 and extends toward the lower end of the rear edge.

  The lumbar support 2 includes a flexible plate 20 formed from a central wide vertical plate 20a and a plurality of blades 20b and 20c extending left and right from the wide vertical plate 20a. The flexible plate 20 is hung with wires on the left and right vertical bars 21a and 21b, and the left and right vertical bars 21a and 21b are spring-tensioned on both side portions 11 and 12 of the seat back frame 1, so that the seat back It is stretched within the frame 1.

  As the wire suspension of the flexible plate 20, a U-shaped shaft bending wire 22 that supports the upper side of the flexible plate 20 from behind is stretched and attached to the upper end of the vertical bars 21a and 21b. Also, two bundled straight wires 23a and 23b that support the lower side of the flexible plate 20 from behind are hooked on the axis of the vertical bars 21a and 21b with the wire ends on both sides opened in a bifurcated shape. Yes.

  As spring tension of the vertical bars 21a and 21b, coil springs 24a and 24b that pull the upper side of the flexible plate 20 so as to be displaceable are the shaft upper ends of the vertical bars 21a and 21b and the side plates 11a of the side portions 11 and 12. , 12a. Further, the straight wires 25a and 25b for pulling the lower side of the flexible plate 20 so as not to be displaced are pulled between the lower ends of the vertical bars 21a and 21b and the side plates 11a and 12a of the side portions 11 and 12 at both ends. It is mounted with a hanging hook.

  In addition to the wire suspension and spring tension described above, the straight wire 26a that keeps the distance between the vertical bar bars 21a and 21b so that the vertical bar bars 21a and 21b that stretch the flexible plate 20 can be assembled against each spring tension. ˜26e are mounted on the axis of the vertical bar 21a, 21b while being shifted vertically.

  The cable wire 3 includes a pulling wire 3a that deforms the flexible plate 20 forward and is inserted into the tube of the cable tube 3b. In this wire cable 3, one end of the cable tube 3b is fastened and fixed to the upper side of the flexible plate 20 by a stop ring 3c, so that the pulling wire 3a is wound up by the traction device 4 operated by the reversible motor 4a. Is assembled so that it can be rewound.

  The cable wire 3 fastens the cable tube 3b from the substantially rear center of the flexible plate 20 toward the upper portion 10 of the seat back frame 1 to the right side of the back plate 10b inside the upper portion 10 with the clip 5. Since the cable tube 3b is bent downward from the upper portion 10 and extends to the inside of the right side portion 12, the cable tube 3b is connected to the traction device 4 attached to the plate surface of the side plate 12b inside the right side portion 12.

  The pull wire 3a is connected to a swinging piece 27a attached to the center of the rear side of the movable plate 20 on the tip side extending in the plane of the flexible plate 20 from the retaining ring 3c of the cable tube 3b.

  The swing piece 27a is pulled at the intermediate portion by the support wire 27b extending from the lower side of the flexible plate 20, and the right end side is pulled upward by the support wire 27c extending from the upper side of the flexible plate 20, Since the left end side positioned below and the tip end side of the pulling wire 3a are connected via the intermediate portion, the intermediate portion is pivotably attached. Thereby, the flexible plate 20 is provided so that it can be pulled out by changing the posture of the swing piece 27 accompanying the pulling of the cable wire 3.

  In the seat back frame provided with the lumbar support 2, the insertion holes 14 a and 14 b (see FIG. 2) of the clip that can be used alternatively are left and right on the plate surface of the upper portion 10 that is equidistant from the vertical center line X. It is provided near. Among these fitting holes 14a and 14b, the wire cable 3 is fixed to the plate surface of the back plate 10b with a clip 5 fitted into the right fitting hole 14a. The fitting holes 14a and 14b are provided within the area of a horizontally long elliptical cradle 14c formed by extruding the plate surface of the back plate 10b forward.

  As the installation surface of the traction device 4, as shown in FIG. 3, a through hole 15 through which a mounting bolt (not shown) of the traction device 4 is inserted is provided in the side plate 11 a of the side portion 11. The traction device 4 is mounted on the plate surface of the side plate 11a inside the right side portion 11 because the mounting bolt inserted into the through hole 15 is fastened and fixed by the nut 4b (see FIG. 1).

  In addition to the above, the coil springs 24a and 24b and the retaining rings 16a, 16b, 17a and 17b (see FIG. 2) for latching one end side of the straight wires 25a and 25b are U-shaped from the plate surfaces of the side plates 11a and 12a. It is divided into upper and lower parts so as to protrude. Further, an opening 18 (see FIG. 3) through which a motor driving harness (not shown) is inserted is provided on the plate surface of the side plate 11.

  In the seat back frame, holder cylinders 19a and 19b for standing the headrest stays over the plate surfaces of the top plate 10a and the back plate 10b inside the upper portion 10 in order to provide a detachable headrest (not shown). It is provided vertically.

  Further, left and right cam devices 6a and 6b are connected to the lower side portions of the side portions 11 and 12 by being connected by an operating shaft 7 so as to be assembled as a seat back whose tilt angle can be adjusted by a reclining mechanism. At the same time, side brackets 8a and 8b, which are bolted and fixed to the seat cushion frame, are mounted on the operating shaft 7 so as to be displaceable from the lower side of the side portions 11 and 12.

  The seat back frame 1 is configured to have a bilaterally symmetric structure with respect to the vertical center line X, including the above-described mechanisms. For this reason, the seat back frame 1 includes the lumbar support 2, the attached devices 3 and 4, and each mechanism portion, so that it can be used for both driver seats and assistant seats.

  When assembling a driver's seat back from the seat back frame 1, the wire cable 3 ′ is drawn upward from the upper left side of the lumbar support 2 ′ and curved downward from the upper portion 10 as shown in FIG. 4. Attached to the plate surface of the side plate 12a on the inner side of the left side portion 12 by wiring to the left side portion 12 and fastening to the plate surface of the back plate 10b with the clip 5 fitted in the left fitting hole 14b. What is necessary is just to connect with the traction device 4 'to perform.

  With such a structure of the seat back frame, the entire frame is formed from a light alloy into a substantially quadrangular frame shape, and the lumbar support is provided within the frame of the seat back frame 1 but is also used for driver seats and assistant seats. Therefore, it is possible to mold without incurring high costs, and it is possible to easily manage the production quantity and the inventory quantity.

1 is a front view showing a light alloy seat back frame with a lumbar support according to the present invention on an assistant seat side for an automobile. It is a front view which shows the seat back frame of FIG. It is a side view which shows the seat back frame of FIG. 1 is a front view showing a light alloy seat back frame with a lumbar support according to the present invention on the side of a driver seat for an automobile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat back frame 10 Upper part of seat back frame 11, 12 Side part of seat back frame 13 Lower part of seat back frame 14a, 14b Insertion hole of clip 2 Lumbar support 20 Flexible plate of lumbar support 21a, 21b Lumbar support Vertical bar 3 Wire cable 4 Traction device X Vertical center line of seat back frame

Claims (1)

The base frame is a seatback frame that is made of light alloy to form a roughly quadrilateral frame.
The flexible plate is hung on the left and right vertical bars, and the left and right vertical bars are spring-tensioned on both sides of the seat back frame, and the flexible plate is stretched in the frame. The cable wire from the approximate center toward the upper part of the seat back frame is fixed to the inside of the upper part with a clip, curved downward from the upper part, extended to the inside of one side part, and installed inside the one side part In a vehicle seat provided with a flexible plate as a lumbar support that can be pushed forward by pulling with a cable wire because it is connected to a cable wire traction device that
The plate of the upper part that forms the entire frame including the installation surface of the traction device symmetrically with respect to the vertical center line, and the fitting hole of the clip that can be used alternatively is equidistant from the vertical center line An automobile seat made of a light alloy frame with a lumbar support, wherein a seat back frame provided on the surface is assembled to a base frame.

Images