JP2005082055A - Frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a frame structure capable of employing a pipe of the necessary minimum diameter from the viewpoint of the strength, reducing the weight of a frame thereby, and preventing ingress of spatter generated when welding a screw portion of a nut. <P>SOLUTION: In the frame structure in which a nut 14 is stored in and fixed to an end part of a pipe 6 to constitute a frame, the end part of the pipe 6 is expanded, and the nut 14 is stored in an expanded portion 6a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a frame structure, and more particularly to a frame structure suitable for mounting an automobile seat.

Some automotive seats are provided with a pipe extending left and right at the rear of the frame, a nut is welded to one end of the pipe, and a seat belt anchor is fastened to the nut with a bolt ( For example, see Patent Document 1 or Patent Document 2.)
Japanese Utility Model Publication No. 62-187654 (FIGS. 2 and 3) Japanese Utility Model Publication No. 5-3068 (FIG. 2)

By the way, the size of the nut for attaching the anchor for the seat belt is regulated to a predetermined size (7/16 inch, about M11.1) in terms of strength.
In order to embed this nut in the pipe, a pipe having an inner diameter larger than the outer diameter of the nut must be adopted, and the strength of the pipe becomes an over spec and the weight of the frame increases. There is.

  The present invention has been made in view of such a situation, and an object of the present invention is to adopt a pipe having the minimum diameter necessary for strength, thereby reducing the weight of the frame, and further, An object of the present invention is to provide a frame structure in which spatter generated during welding does not enter the threaded portion.

  In the frame structure according to claim 1, in the frame structure in which the nut is accommodated and fixed in the end portion of the pipe constituting the frame, the end portion of the pipe is expanded in diameter, and the nut is accommodated in the expanded diameter portion. .

  In the frame structure of claim 2, in the invention of claim 1, the nut is fixed to the bracket in advance, and the bracket is fixed to the outer peripheral edge of the end of the pipe by welding in a state where the nut is accommodated in the pipe. doing.

  In the frame structure of claim 3, in the invention of claim 2, the pipe is a rear cross member of a frame that supports an automobile seat, and the bracket is an attachment portion that supports a pivot shaft of a seat back; A bracket including a bolt insertion hole for bolting a belt anchor of a seat belt to a nut.

  In the frame structure of claim 4, in the invention of claim 3, the reclining device mounting bracket is fixed to the other end of the pipe.

  In the frame structure of claim 5, in the invention of claim 3, the seat includes a seat cushion and a seat back, a pivot shaft portion is provided below the seat back, and the pivot shaft portion is the center. The seat back is pivotally attached to the bracket, the upper part of the front leg is pivotally attached to the front lower side of the seat cushion, and a connecting bracket for connecting the rear part of the seat cushion and the lower part of the seat back is provided. Providing the seat back mounting portion of the connecting metal fitting at a position higher than the pivot shaft portion so that the seat cushion moves downward in conjunction with tilting the seat back, The nut is fixed to one of the left and right brackets of the seat, and a reclining device is provided to the other bracket.

  According to the first aspect of the present invention, since the pipe is expanded in diameter and the nut is accommodated in the expanded diameter portion, the pipe having the minimum diameter required for strength can be employed, thereby reducing the weight of the frame. I can plan.

  According to the invention of claim 2, since the nut is welded to the bracket in advance, and the bracket is welded to the pipe, there is no possibility that spatter generated during welding enters the threaded portion of the nut.

  According to the invention of claim 3, since the pipe is used as the cross member of the seat frame and the nut for attaching the belt anchor is accommodated in the end portion of the pipe, the layout can be improved and the pipe having a small diameter can be obtained. It can be used and the weight of the frame can be reduced. Further, since the nut is welded to the bracket in advance and the bracket is welded to the pipe, there is no possibility that spatter generated during welding enters the threaded portion of the nut, and the attachment of the belt anchor is ensured.

  According to the invention of claim 4, the pipe is used as a cross member of the seat frame, brackets for supporting the pivot shaft of the seat back and the reclining device are attached to both ends of the pipe, and further accommodated in the pipe Since the belt anchor of the seat belt can be fastened to the nut through the bracket, the frame can be made compact.

  According to the invention of claim 5, even if the seat cushion is a type of seat in which the seat cushion moves downward as the seat back is tilted, the weight of the frame can be reduced, and a nut is previously welded to the bracket. In addition, by welding the bracket to the pipe, it is possible to prevent spatter generated during welding from entering the threaded portion of the nut.

Hereinafter, a frame structure according to the present invention will be described with reference to the drawings.
1 is a conceptual perspective view showing a reclining seat of an automobile to which a frame structure according to an embodiment of the present invention is applied, FIG. 2 is a side view of the seat of FIG. 1, and FIG. 3 is a seat back in the seat of FIG. 4 is a side view showing a folded state, FIG. 4 is a perspective view conceptually showing a part of a seat frame in which a pipe is extended left and right at a rear portion, and FIG. 5 is attached to an end portion of the pipe of FIG. FIG. 6 is an exploded perspective view showing a bracket, and FIG.

  The illustrated reclining seat 1 has a structure in which a seat back 9 can be tilted forward with respect to a seat cushion 10, and is attached to a seat frame 2. The seat frame 2 includes upper rails 3 that constitute both left and right side portions. The upper rails 3 are slidably attached to the lower rails 4 and attached to the vehicle body floor 5 via the lower rails 4.

As shown in FIG. 4, a pipe 6 extending in the left-right direction at the rear end is disposed on the upper rail 3 of the seat frame 2. Brackets 7 and 8 mounted on the upper rail 3 are fixed to the left and right ends of the pipe 6, and the brackets 7 and 8 are connected to each other by the pipe 6. Then, both sides of the lower end portion of the seat back 9 are rotatably disposed on the brackets 7 and 8 by a rotation shaft portion 9a.
In addition, as shown in FIGS. 1 to 3, the seat cushion 10 is attached to the upper rail 3 on the left and right sides of the lower portion of the front end by the front legs 11, and both sides of the rear end portion are connected to the seat back 9 via the connecting bracket 12. Are connected above the pivot shaft portion 9a of the seat back 9. That is, the attachment part of the seat back 9 of the connection fitting 12 is disposed at a position higher than the rotation shaft part 9 a of the seat back 9.

  In such a seat 1, when the seat back 9 in the state of FIG. 2 is folded forward as indicated by an arrow, the seat cushion 10 is moved downward as shown in FIG. Configured to move to.

As shown in FIGS. 4 and 5, the pipe 6 of the seat frame 2 has an enlarged diameter at one end, and the enlarged diameter portion 6a is formed to have a size that can accommodate a nut described later. Has been. That is, the reference inner diameter of the pipe 6 other than the enlarged diameter portion 6a is formed smaller than the outer shape of the nut described later, and the inner diameter of the enlarged diameter portion 6a is formed larger than the outer diameter of the nut described later. .
The bracket 7 fixed to one end portion of the pipe 6 includes an upper hole (attachment portion) 7a for supporting a rotating shaft (see FIGS. 2 and 3) disposed at the lower end of the seat back 9, and an anchor for a seat belt buckle. 13 has a lower hole 7b to be attached. Furthermore, a nut 14 is fixed to the inner surface side of the bracket 7 by welding a concentrically with the lower hole 7b. The bracket 7 is fixed to the outer peripheral end of the pipe 6 by welding b as shown in FIG. 6 in a state where the nut 14 is accommodated in the enlarged diameter portion 6 a of the pipe 6. .
On the other hand, the bracket 8 fixed to the other end of the pipe 6 has an upper hole 8 a for attaching a reclining device (not shown) and a lower hole 8 b for fitting the bracket to the pipe 6. Then, the bracket 8 is configured such that the lower hole 8b of the bracket 8 is fitted into the pipe 6 and the tip of the pipe 6 is slightly protruded from the lower hole 8b, as shown in FIG. The outer peripheral end of 6 is fixed by welding c.

  Thus, the anchor 13 of the seat belt buckle is attached to the nut 14 of the bracket 7 fixed to the pipe 6 by the bolt 15 as shown in FIG. On the other hand, the size of the bolts and nuts for attaching the anchor 13 of the seat belt buckle is defined as a predetermined size in terms of strength, and the size is 7/16 inch (about M11.1).

  In the frame structure according to the embodiment of the present invention, the enlarged diameter portion 6a is formed at one end of the pipe 6, and the nut 14 is accommodated by the enlarged diameter portion 6a. Accordingly, it is not necessary to use the pipe 6 having a large diameter corresponding to the outer shape of 14, and the overall weight of the seat frame 2 can be reduced by using the pipe 6 having a small diameter. Further, since the installation position of the pipe 6 and the installation position of the nut 14 are set to be concentric, when the pipe 6 is welded, the spatter that is a foreign object of welding is applied to the screw portion of the nut 14 that is fixed first. Can be prevented from entering.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.
For example, in the above-described embodiment, the example in which the frame structure of the present invention is applied to the frame 2 of the automobile seat 1 has been shown. However, the present invention can of course be applied to a frame other than the frame of the automobile seat. It is.
Further, in the above-described embodiment, one end of the pipe 6 is expanded and the nut 14 of the bracket 7 is accommodated in the expanded diameter portion 6a. You may accommodate the nut of a bracket in an enlarged diameter part, respectively. Further, as the outer shape of the nut 14, not only a hexagonal shape but also various shapes such as a square shape and a circular shape can be used.

1 is a conceptual perspective view showing an automobile reclining seat to which the present invention is applied. It is a side view of the sheet | seat of FIG. It is the side view which showed the state which folded the seat back in the seat | sheet of FIG. It is the perspective view which showed notionally a part of seat frame which made the rear part extend the pipe right and left. It is the disassembled perspective view which showed the bracket attached to the edge part of the pipe of FIG. It is sectional drawing of the state which attached the bracket to the edge part of a pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reclining seat 2 Seat frame 3 Upper rail 4 Lower rail 5 Car body floor 6 Pipe 6a Expanding part 7 Bracket 7a, 7b Hole 8 Bracket 8a, 8b Hole 9 Seat back 10 Seat cushion 11 Front leg 12 Connecting bracket 13 Anchor 14 Nut 15 Bolt

Claims (5)

A frame structure in which a nut is accommodated and fixed in an end portion of a pipe constituting a frame, wherein the end portion of the pipe is expanded in diameter, and the nut is accommodated in the expanded diameter portion. The frame structure according to claim 1, wherein the nut is fixed to the bracket in advance, and the bracket is fixed to the outer peripheral edge of the end of the pipe by welding in a state where the nut is accommodated in the pipe. The pipe is a rear cross member of a frame that supports a vehicle seat, and the bracket is an attachment portion that supports a pivot shaft of a seat back and a bolt insertion for bolting a belt anchor of a seat belt to a nut. The frame structure according to claim 2, wherein the frame structure is a bracket having a hole. The frame structure according to claim 3, wherein the reclining device mounting bracket is fixed to the other end of the pipe. The seat includes a seat cushion and a seat back, a pivot shaft portion is provided below the seat back, and the seat back is pivotally attached to the bracket around the pivot shaft portion. The upper part of the front leg is pivotably attached to the lower front side of the cushion, and a connection fitting for connecting the rear part of the seat cushion and the lower part of the seat back is provided, and the seat back attachment part of the connection fitting is rotated. By disposing at a position higher than the shaft portion, the seat cushion moves downward in conjunction with tilting the seat back, and the nut is fixed to one of the left and right brackets of the seat, and the other The frame structure according to claim 3, wherein a reclining device is provided on the bracket.

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