Automobile seat with a backrest frame

Details Automobile seat with a backrest frame Automobile seat with a backrest frame

1990-04-23

1992-06-23

Dorner, Kenneth J.

Chairs and seats

Bottom or back

Framework

297355, 297460, A47C 702

Patent

active

051237067

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

This invention relates to an automobile seat with a backrest frame and/or a seat frame, each of which has open side braces placed laterally and essentially U-shaped in cross section.
Frame constructions with side brace hollow profiles open on one side are known. They are used primarily with small thicknesses to reduce weight. Of course, special measures are necessary to make such side brace hollow profiles rugged and torsionally rigid. This applies particularly to the side braces of backrest frames, to the top of which a safety belt may also be fastened.
As measures for achieving the desired load capacity and torsional rigidity of the side braces, it is known how to give side braces, generally made of rod material, a special cross sectional profile, which can be symmetrically C-shaped, U-shaped, or Z-shaped for example. It is also known how to arrange the side braces of backrest frames so that the axis of the largest moment of resistance points approximately in the direction of action of the safety belt, i.e., diagonally to the long direction of the seat (cf. DE-OS 36 24 295). However, this then results in a larger structural volume for the backrest which is inherently desired to be particularly flat, and a smaller moment of resistance in the direction of the forces acting approximately perpendicular to the backrest that are especially large in the area of linkage of the backrest frame to the seat bottom and/or to the seat frame.
It is the purpose of this invention to propose a design for the side braces of the backrest frame and/or of the seat frame that can absorb high forces from all important directions of application, and at the same time is torsionally rigid and nevertheless does not require a larger structural volume for the seat, and particularly not for the backrest desired to be of flat design.
This problem is solved pursuant to the invention by the fact that the open side of the side braces extends away from the top of the seat used by the passenger and that the back of the side braces facing the passenger has such a large width, at least in some areas, that structural adjusting units for the seat can be placed in the cavity enclosed by the side braces, i.e., in the inner profile space of the side braces. It is desirable to provide that the adjusting units located in the profile space are fastened to both side walls of the side brace.
Particularly beneficial side braces pursuant to the invention also have a diagonal surface that is placed at the center of the seat, and a side brace back width that changes relative to the backrest frame, which decreases essentially conforming to the outer contour of the backrest starting from the bottom of the side braces toward the head of the backrest frame.
With regard to the backrest frame, it is beneficial also to modify the structural depth of the side braces, specifically increasing toward the bottom of the side braces. At this bottom end of the side braces, i.e., at their base, the pivot axis is then shifted forward toward the passenger for the tilt adjustment of the backrest, i.e., it is located next to the back of the side braces. On the other hand, the linkage points of the tilt adjusting mechanism are then to be positioned on the side braces toward the rear, i.e., away from the passenger next to the open side of the side braces. This results in a particularly effective linkage of the side braces of the backrest frame to the seat bottom or the seat frame that can handle all forces properly.
As a result, the construction pursuant to the invention provides that the side braces have a wide back profile with a wide inner profile space to hold adjusting units for the seat, and at the same time because of the diagonal surfaces designed in them and because of a certain outer contour shape, and also because of the mentioned structural depth modification toward the deep and wide base of the side braces, they constitute a polyhedral object that can absorb large forces from all important directions of application with tors

REFERENCES:
patent: 2998281 (1961-08-01), Stoner et al.
patent: 3079118 (1963-02-01), Pickles
patent: 4585273 (1986-04-01), Higgs et al.

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