US1716871A - Chair - Google Patents

Description

J 1929- E. D. WELDON CHAIR Filed Nov. 23, 1925 HUNVI INVENTOR. l v A. M

Patented June 11, 1929.

UNITED STATES PATENT OFFICE.-

EVERETT D. WELDON, OF HASTINGS-ON-HUDSON, NEW YORK, ASSIGNOR TO EARL THOMPSON POSTURE SEATING, INQ, OF NEW YORK, N.

NEW YORK.

Y., A CORPORATION OF CHAIR.

Application filed November 23, 1925.

My invention relates to chairs and more particularly to a chair constructed to pro vide ease and comfort to the person seated thereon.

An object of my invention is to provide a chair for general purposes. Another object is to build it according to basic principles of sitting posture paying particular attention to the angle of the chair back and of the seat with relation to the vertical and horizontal respectively.

It is well known that the average rigid chair is not constructed to provide the comfort necessary for a prolonged period of sitting. Because of this, the average type of chair is frequently tipped onto its back legs alone in order that the chair be rendered more comfortable to the user. I have therefore provided a chair which will overcome these CllfllCUltlBS by certain modifications in the construction thereof. The advantages of my chair over the usual rigid chair, are many, as will hereinafter appear. By the particular angle of the back and of the seat to the vertical and horizontal respectively and the particular position of the back support between the posts, the dorsal region of the spine and the pelvic bones are properly positioned in their normal locations in the body of the person seated in the chair.

The chair may of course, be made in various sizes depending on the stature of the person to be fitted.

I attain these objects by the device illustrated in the accompanying drawings in which Figure 1 is a perspective view of the assembled chair,

Figure 2 is a rear view of part of the chair diagrammatically showing the location of a human body seated thereon,

Figure 3 is a vertical section on the line 33 of Figure 2.

Figure 4; is a horizontal cross section on line l l, of Figure 2.

Figure 5 is a plan view of the chair seat.

Similar characters of reference refer to similar parts throughout the several views.

In Figure 1 is shown a chair embodying my improved. construction. Th seat sa i Serial No. 70,727.

dle 1 is carved as an intaglio of the sitting parts of the human body, whereby the pres sure of the body is evenly distributed over the chair seat and the two tuberbosities 2 of the ischia do not bear all the weight of the body. This carving out of the seat also allows the great and small trochanters to come into play as stabilizers for the seated torso.

The back support 3 is bent between posts 5 so that it is slightly concave to allow contact thereof only with the erector spinae muscles. This eliminates all possibility of producing injurious results which may be caused by contact of the back support wit-h the tips of the spinous processes. This concave curve of the back support is very slight at the top or shoulder line 4 so that thereis no tendency to cause round shoulders. The angle which this back support and the posts 5, 5 make with the vertical is substantially 8 30. This has been found to be the best inclination for both comfort and proper posture. The posts 5, 5 are also set at the seat with their center lines on a line with the extreme back edge of the carved out seat, Fig. 3. The seat is inclined so that its rear edge is about one-half inch below its forward edge.

The back support 3 has an upwardly curved lower edge and is placed between the posts 5, 5 at such a height that the curved lower edge will conform to the contour of the body in the region of the lowest dorsal and highest lumbar vertebrae, as at 6. This positioning will cause the back support to be sufficiently far to the rear of the cut out seat to anchor the body in a comfortable and normal sitting position.

Having thus described my invent-ion what I claim is:

1. In a chair, the combination of a saddle seat shaped as an intaglio of the sitting parts of the human body, said seat being inclined downwardly toward the rear end thereof, back supporting posts secured to said seat at the rear edge thereof, said posts being inclined rearwardly from the vertical at an angle at sub tantially eight and one-half degrees; are center line of said pests being substantially on a line with the rear edge of the carved portion of said seat, a conca'ved back support having an upwardly curved lower portion extending between said posts, said support being spaced from the seat to permit a portion of the body of the user to extend thereunder.

2. In a chair as set forth in claim 1, wherein the back support is positioned between the shoulder line and the lowest dorsal vertebrae of the user, said support being slightly concave at the shoulder portion.

In testimony whereof I afliX my signature.

EVERETT D. VVELDON.

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