JP2001340160A - Seat back frame made of light weight alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of holding the external shape of a stay guide without depending on thick molding accompanied by voids and sinks and without largely changing the die structure of a molding die. SOLUTION: A rear part side from the open holes 60 of the stay guides 6a and 6b on an outer frame upper side 2a where the open holes 60 of the stay guides 6a and 6b are positioned is recessed in an almost chevron shape and thin reinforcing ribs 11 from the outer frame upper side 2a to the back of the stay guides 6a and 6b are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a lightweight alloy seat back frame molded from a magnesium alloy.

[0002]

2. Description of the Related Art In general, attempts have been made to mold a seat frame from a magnesium alloy because magnesium alloy can be recycled. As one example, an attempt has been made to die-cast a seat back frame as shown in FIGS.

The seat back frame includes a substantially quadrangular back frame 1 that is continuous from a wide back frame upper side 1a to left and right back frame side sides 1b and 1c and a back frame lower side 1d. A cross member extending over the left and right back frame lateral sides 1b and 1c with the outer frame 2 projecting forwardly as a base frame, and a horizontally long substantially quadrangular opening 3 whose upper edge is the lower edge of the back frame upper side 1a is provided. 4 and a rimming flange 5 is provided around the edge of the opening 3, and stay guides 6a and 6b of the headrest extending from the upper edge 2a of the outer frame to the upper edge 5a of the rimming flange 5 are provided in a substantially cylindrical shape. I have.

In the seat back frame, as shown in FIG. 5, the stay holders 7a and 7b are
a, 6b, a headrest (not shown) is detachably provided, and a plurality of zigzag springs 8a to 8c for supporting the back pad are provided on the outer frame side 2b,
The terminal hooks 9a..., 9b.

In this seat back frame, it is necessary to maintain the outer shape of the stay guides 6a and 6b. According to the request, the stay guide 6 is located at the upper side 2a of the outer frame where the openings (not shown) of the stay guides 6a and 6b are located.
It is conceivable that the rear side of the openings a and 6b is formed thicker.

However, when the upper side 2a of the outer frame is formed into a thick wall, cracks or missing parts due to voids or the like are generated, thereby lowering the strength. In addition, since the sink occurs due to shrinkage, the hole diameter of the stay guide changes, and the dimensions cannot be determined with high accuracy.

[0007]

SUMMARY OF THE INVENTION The present invention has a structure capable of retaining the outer shape of a stay guide which can be molded without using thick molding with voids and sink marks and without greatly changing the mold structure of the mold. It is an object of the present invention to provide a lightweight alloy seat back frame.

[0008]

According to the present invention, there is provided a lightweight alloy seat back frame according to the present invention, comprising a substantially quadrangular back frame which is continuous from an upper side of a wide back frame to lateral sides of right and left back frames and a lower side of the back frame. An outer frame projecting forward from the outer edge of the back frame is used as a base frame, and a horizontally long substantially quadrangular opening is provided where the upper edge is the lower edge of the upper side of the back frame. A member is provided, and an edge flange is provided around the edge of the opening to provide a stay guide for a headrest extending from the upper edge of the outer frame to the upper edge of the edge flange, and the upper edge of the outer frame where the opening of the stay guide is located. The stay guide is formed by recessing the rear side from the opening of the stay guide into a substantially rectangular shape and providing a thin reinforcing rib extending from the upper side of the outer frame to the back of the stay guide.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 4, the seat back frame shown is formed by applying a die cast molding and an injection molding from a magnesium alloy. Has the same frame structure as that shown in FIGS. 1 to 4
The same structural parts as those shown in FIGS. 5 and 6 are denoted by the same reference numerals.

As shown in FIG. 1, the seat back frame comprises a substantially quadrangular back frame 1 which is continuous from the upper side 1a of the back frame to the left and right side sides 1b, 1c and the lower side 1c of the back frame. And an outer frame 2 projecting forward from an outer peripheral edge of the outer frame 2 as a base frame.

In the back frame 1, the upper side 1a of the back frame is formed to have a width corresponding to the vertical dimension of the stay guides 6a and 6b because the stay guides 6a and 6b of the headrest need to be provided. Further, the outer frame 2 is formed to have a predetermined rising dimension in order to attach a back pad.

The seat back frame is provided with a horizontally long substantially quadrangular opening 3 having an upper edge serving as an upper side 1a of a back frame, and a cross member 4 having a lower edge of the opening 3 serving as an upper edge includes left and right back members. It is provided so as to reinforce the back frame lateral sides 1b, 1c over the frame lateral sides 1b, 1c. Around the edge of the opening 3, a rim flange 5 is provided so as to be continuous from the upper edge of the cross member 4.

In the seat back frame, stay guides 6a and 6b of the headrest are provided from the upper side 2a of the outer frame to the upper edge 5a of the rim flange 5. The stay guides 6a and 6b are provided with an opening formed on the upper side 2 of the outer frame.
It is formed in a cylindrical shape in which the stay holders 7a and 7b can be fitted and inserted while being positioned in the plane of a.

In the frame structure, as shown in FIG. 1, the rear side of the opening 60 of the stay guides 6a, 6b is substantially rectangular in the outer frame upper side 2a where the opening 60 of the stay guides 6a, 6b is located. By making the recess 10 concave,
The thin reinforcing rib 11 as shown in FIG.
a from the back of the stay guide 6a. Others are shown in FIG. 3 (the upper side 1 of the back frame shown in FIG. 5).
a) (see the left and right sides), the upper side 1a of the back frame is formed to protrude forward.

Since the reinforcing ribs 11 are provided from the upper side 2a of the outer frame to the back 61 of the stay guide 6a, the outer shape of the stay guide can be maintained. In addition, by forming it in a thin shape, it can be formed without causing voids or sink marks, and can be formed by providing a projection for forming the concave portion 10 on the die surface on which the outer frame upper side 2a is formed. Does not need to be changed significantly.

In the frame structure, the headrest H can be set up by inserting the headrest stay S through the stay holder 7b as shown in FIG.
The headrest stay S may be assembled so that the lower end of the shaft faces the cross member 4 with a gap g therebetween.

In the headrest mounting structure, the external force P
Is applied from the rear side of the headless H, the back guide upper side 1a including the reinforcing ribs 11 prevents the stay guides 6a, 6b from being displaced rearward, and even if displaced rearward, the headrest stay S When the lower end of the shaft abuts on the cross member 4, it can function as an impact receiver.

[0018]

As described above, according to the seat back frame made of the lightweight alloy according to the present invention, the rear side of the stay guide opening on the upper side of the outer frame where the stay guide opening is located is substantially shaped like a letter R. By providing a thin reinforcing rib extending from the upper side of the outer frame to the back of the stay guide, the stay can be formed without thick molding with voids and sink marks and without significantly changing the mold structure of the mold. The guide can be configured to be able to hold the outer shape.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an upper side of a lightweight alloy seat back frame according to the present invention.

FIG. 2 is a partial cross-sectional view showing a forming portion of a stay guide in the lightweight alloy seat back frame according to the present invention.

FIG. 3 is a partial cross-sectional view showing an upper general surface of the lightweight alloy seat back frame according to the present invention.

FIG. 4 is an explanatory view showing a mounting structure of a headrest in the lightweight alloy seat back frame according to the present invention.

FIG. 5 is a front view showing a lightweight alloy seat back frame according to a general example.

FIG. 6 is a side view showing the lightweight alloy seat back frame of FIG. 5;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 back frame 1a back frame upper side 1b, 1c back frame side 2 outer frame 2a outer frame upper side 3 opening 4 cross member 5 edging flange 6a, 6b stay guide 60 stay guide hole 11 reinforcing rib

Continuation of the front page (72) Inventor Toshiyuki Shimano 118-1 Ota, Takanezawa-cho, Shioya-gun, Tochigi Pref. TS Tech Co., Ltd. Technical Center F-term (reference) 3B084 EC01

Claims (1)

[Claims] 1. A base frame comprising: a substantially quadrangular back frame continuous from an upper side of a wide back frame to left and right sides of a back frame and a lower side of the back frame; and an outer frame projecting forward from an outer peripheral edge of the back frame. The upper edge is provided with a horizontally long substantially quadrangular opening serving as the lower edge of the upper side of the back frame, a cross member is provided across the left and right back frames, and a trimming flange is provided around the edge of the opening. In a lightweight alloy seat back frame provided with a head guide stay guide extending from the upper side of the outer frame to the upper edge of the edging flange, the rear side of the outer side of the upper side of the outer frame where the opening of the stay guide is located is substantially rearward. A lightweight alloy seatback frame characterized by having a thin reinforcing rib extending from the upper side of the outer frame to the back of the stay guide.