US1543367A - Adjustable chair back - Google Patents

Description

June 23, 192 5. 1,543,367

W. CARR ADJUSTABLE CHAIR BACK Filed Jan. 25, 1924 Patented June 273, 1925 I UNITED STATES WILLIAM CARE, on

1,543,367 PATENT OFFICE.

nLvnnn, KANSAS.

ADJUSTABLE CHAIR BACK.

' Application filed January 25, 1924. Serial No. 688,515.

T all. whom it may concern:

Be it known that I, TIL-LIAM CARR, a citizen of the United States, residing at Melvern, in the county of Osage and State of Kansas have inventeda new and useful Adjustable Chair Back, of which the following is a specification.

This invention relates to household furniture and more particularly to chairs having adjustable backs.

The object of the invention is to provide a simple and efficient back of this character which moves automatically to various angles according to the movements of the user and is yieldably supported in any inclined position either forward or backward, the back following and constantly and lightly touching the back of the user thereby lessening back strain and fatigue.

Another object is to construct and mount a back of this character so that it may move in an extended arc and which has a uniform easy motion back and forth without requiring any exertion on the part of the user.

Vith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings Figure 1 represents a side elevation of a chair equipped with this improvement, the back being shown in the position which it assumes when not in use;

Fig. 2 is a front elevation thereof with the upper portion of the back broken off for convenience in illustration; and

Fig. 3 is a detail plan view showing the means for adjustably connecting the connector which unites the chair back with the seat.

In the embodiment illustrated the chair 1- is shown having an ordinary seat 2 and a back 3 pivotally connected at its lower end with the rear portion of the seat by lag screws 5 which provide for the movement of the back in an extended arc.

As shown the back includes side rails or bars 4 connected by cross bars 4*. These side bars 4 are connected by heavy coiled springs 6 and 7 at points intermediate their the eye bolts 8.

length to the side edges of the seat 2 at points in advance of the pivotal connection oftlie back with the seat. Eye bolts 8 are adjustably mounted in sockets 9 formed in the side edges of the chair seat-and connect the lower ends of the springs 6 and 7 with the seat. Chains 10 extend through the springs 6 and 7 and are also connected with The other ends of the springs and of the chains are connected by eye bolts 11 with the side rails of the chair back. The chains 10 are of a length sufficient to permit the back 3 to tip back to a predetermined point against the tension of'the springs 6 and 7. By using chains in the coiled springs 6 and 7 to limit the rearward tilting movement of the chair back these chains will by their own weight'drop down through the springs as the chair back is inclined forward which would not be the case if a cord, cable or rope were used since any of these would form a loop instead of collapsingas does the chain.

A lighter coiled spring 12 connects the rear edge of the chair seat 2 at a point midway its width with one of the cross bars 4 of the back any suitable means being em ployed for effecting this connection eye bolts 13 and 14 being here shown. This coiled spring 12 tends to pull the chair back rearward and prevents it from tipping forward too far as is shownv clearly in Fig. 1.

It is of course understood that the tension of springs 6 and 7 may be varied by changing the position of the eye bolts 8 three longitudinally spaced sockets ,9 being here shown for this purpose although obviously any desired number may be employed.

By mounting the back as shown and described it will be yieldably supported in any inclined position either forward or backward and it will follow the back of the user Whether stooping forward or leaning back without any exertion on the part of the user and thus lessen back strain and fatigue.

I claim 1. In a chair the combination of a seat, a back pivotally connected at its lower end with the rear portion of said seat, coiled springs connected at one end to the side members of said back, substantially midway the length of said back and at their other ends to the side edges of said seat intermediate the length of the seat, chains extending through said springs and also connected at their ends to said back and seat, said chains being of a length suflicient to permit the'ba'ck to tip to a predetermined point against the tension of the spring and a coiled spring connecting the rear edge of the chair seat with the upper portion of the chair back whereby said back is held against tipping forward beyond a predetermined point.

2. In a chair the combination of a seat, a back lag screws pivotally connecting" the lowerendzofsaid back with said seat to permit it to swing in an extended arc, eye bolts mounted respectively onthe side edges of said back and the side edgesof the seat, coiled springs'connected at one end with the eyebolts on the back andu-at-their other ends with the eyebblt'sion the seat; chainseXtending through said springs and also connected at their ends with said eye bolts and a coiled spring connected with the rear edge of the seat and with the rear portion of the back midway its height.

In testimony'thatl claim the foregoing as my own, I have hereto affixed my signature in the presence of two Witnesses.

WILLIAM CARR.

WV-itnesses:

VV. O. STEPHENS, R. E. NUMBERS.-

Images