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Publication numberUS27521 A
Publication typeGrant
Publication dateMar 20, 1860
Publication numberUS 27521 A, US 27521A, US-A-27521, US27521 A, US27521A
InventorsSarah D. Cabman
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 27521 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




Specification of Letters Patent No. 27,521, dated March 20, 1860.

To all whom it may concern:

Be it known that I, SARAH D. CARMAN, of Middletown, in the county of Orange and State of New York, have invented a new and Improved Adjustable Back for Chairs,

Sofas. and other Seats; and I do hereby` declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1 is a side sectional view of a chair, with my invention applied to it. Fig. 2 a plan or top view of ditto.

Similar letters of reference indicate corresponding` parts in the two figures.

This invention consists in a peculiar manner of attaching the back to the seat substantially as hereinafter fully shown and described, whereby the back is rendered susceptible of two different adjustments relatively with the seat; and the back thereby rendered capable of being secured in a more or less inclined position, and also further forward or backward on the seat, so as t0 increase or diminish the depth of the same, as the 'convenience of the occupant may require.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A, represents the seat of a chair, and B, its back. This back is made separably from the chair, and its front side is of conveX forni, as shown clearly in Fig. l, the curvature extending gradually backward from the base to the top of the back, so that the occupant of a chair or seat, in leaning or reclining against the back, will have the shoulders thrown back, and the chest projected forward. The back, so far as simple construction is concerned may be put together in any of the known ways; for sofas, and many kinds .of chairs, they would of course be upholstered; they may also be constructed of a` frame with a cane filling.

The back B is connected to the seat A by a hinge or joint C, of peculiar construction. This hinge or joint is formed of two curved bars a, b, said bars being portions of concentric circles as shown clearly in Fig. l. The smaller curved bar a, is secured to the seat A, by means of a screw c, which passes through a nut d, at the lower end of bar a,

the upper end of the bar being provided with a head e, which bears on the upper surface of the back part of the seat, the screw c bearing against the under surface.

It will be seen by the above description, that by screwing up the screw c, the bar a, may be firmly secured to the back part of the seat. The head e, of bar a, may, if desired, be provided with a screw f, to admit of a certain degree of adjustability to its bearing surface, and thereby admit of the back being adjusted vertically to a certain extent, to suit the occupant of the seat.

The larger bar Z), of .the hinge, or joint, has its upper end firmly secured to the lower part of the back B. This bar b, passes through guides or sockets g, g, attached to the bar a, each guide or socket being provided with a set screw 7L, by which the bar Z), may be retained at any desired point. The bar b, is allowed to slide or work freely in the sockets or guides, so that the back may be turned in a more or less inclined position, and in a curve or arc concentric with the bars a, Z).

If necessary, two hinges or oints may be attached to each back and seat, one at each side. For sofas, settees, and long seats, two or more may be necessary, but one would probably be sufiicient for ordinary chairs.

It will be seen from the above description that the back B may be inclined more or less very readily, by merely adjusting the screws 7L., h, of the guides or sockets g, g, and by adjusting the screw c, the hinge or joint may be secured farther forward or backward on the seat, increasing or diminishing the depth of the same, as the convenience of the occupant may require.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

Attaching the back of a chair, sofa, or other seat, to its seat, by means of a hinge or joint C, one or more formed of two curved concentric bars a, Z), attached respectively to the seat and back, and with each other, substantially as and for the purpose set forth.

SARAH D. CARMAN. Witnesses:


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7708344 *Oct 31, 2008May 4, 2010Midmark CorporationPatient chair with locking assembly
US7828038Jan 28, 2005Nov 9, 2010Evrio, Inc.Universal lightweight portable concealment means and methods
Cooperative ClassificationA47C7/402