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Publication numberUS446080 A
Publication typeGrant
Publication dateFeb 10, 1891
Publication numberUS 446080 A, US 446080A, US-A-446080, US446080 A, US446080A
InventorsJlaljijnl william Schrage
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 446080 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.) 2 SheetsSheet 1,



No. 446,080. Patented Feb. 10, 1891,

W. SGHRAGH 2 Sheets-Sheet (N0 Model.)


Paten ted Peb. 10,1891.

. the upper casting.




SPECIFICATION forming part of Letters were No. 446,080, dated February 10, 1891. Application filed July 28,1890. 7 Serial No. 360,155. (No model.)

To (LZZ whom it may concern/.-

Be it known that I, WILLIAM SCHRAGE, a citizen of the United States, residing at Sheboygan, in the county of Sheboygan and State of Wisconsin, have invented certain new and useful Improvements in Tilting-Chairs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in chairs, and more particularly to tilting-chairs; and it consists in certain novel features of construction and combinations and arrangements of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a rear view of the device. Fig. 2 is a front view. Fig. 3 is a'sectional view with part of the upper casting broken away.

Fig. 5 is a view of a modification.

A represents the lower casting or bracket of the tilting device, provided at its center with a perforation a for the reception of the screw of the chair and at its ends with upwardlyprojecting arms B B, said casting or bracket being provided at points between the arms B B and at opposite sides of its center with lugs 11, for a purpose which will be explained farther on. The upwardly-extending arms B B are provided at or near their centers with perforations for the reception of a bolt 0, which bolt also passes through perforations near the lower ends of two arms 0 O, which project downwardly from an upper casting D and embrace the arms 13 B of the lower casting,whereby said upper and lower castings are pivotally connected or hinged together, the movement of the upper casting upon the lower one being limited by the flanges d and e, respectively, which act as stops against which the ends of the projecting arms B B strike when the upper casting has swung its allotted distance in either direction. Three arms ff 9 project from the upper casting D and are provided at or near their free ends with perforations for the reception of fastening devices for securing the device to a chair-bottom, the arm 9 extending forwardly and adapted to be fastenedto the front portion of the chair.

Encirclin g the bolt 0 is a heavy coiled spring Fig. 4: is aview of E, the free ends of which are bent downwardly and adapted to engage the lugs b on the lower casting A, this spring being so coiled that the separate coils thereof shall not lie in contact with each other, and being maintained in proper position by means offlanges h 011 the arms B B. At its center the spring E is eX- tended forwardly to produce a loop '5 for the reception of an adjusting device presently to be described.

Projecting from the center of and within the casting D is a depending arm F, provided with a recess j for the accommodation of the bolt 0 and adapted to project between the central coils of the spring, the rear portion of said arm being provided with shoulders 76 for the accommodation of the central coils of the spring and to hold said coils in place. At or near its upper end the arm F is provided with a vertically-disposed elongated slot Z, through which a screw-rod G passes, the free end of which screw-rod is provided with ahead Z, by means of which said rod is loosely connected with the loop of the spring E. In rear of the arm F a collar H loosely encircles the screw-rod G and is provided with lugs or projections m at diametrically-opposite sides, adapted to loosely enter recesses n on the arm F. On the free end of the screw-rod G a wheel I is screwed, said wheel having an integral collar 0, adapted to bear against the loose collar H. By this construction the tension of the spring E may be regulated at will, the screw rod being loosely connected thereto at one end and looselyconnected to the arm F at a point between its ends, whereby said rod will adapt itself to the varying positions of the loop 1' of the spring E.

Instead of employing one spring E, having aloop '6, two springs maybe employed, as shown in Fig. 5, one end of each spring bearing against one of the lugs 19 of the lower casting and the other ends terminating at points in proximity to the center of the upper casting. With this construction the forward end of the screw-rod G will be provided with a loop 12 for the reception of the forwardends of the springs, instead of a head, as previously explained. By thus constructing a tilting device for a chair a freedom of action will be had and there will be no friction of the spring with the parts of the device or with the parts of itself.

It is evident that slight changes might be made in the details of construction Without departing from the spirit thereof or limiting its scope. Hence I do not wish to limit myself to the precise details of construction herein described; hut,

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

1. In a tilting-chain'the combination, with a pair of members hinged together and a bolt or rod connecting these members, one member provided with stops and the otherwith projecting arms adapted to engage the stops, of a spring encircling the bolt or rod and provided with an elongated portion, a screw connected with the elongated portion of the spring and extending in the direction of the stops, and means for drawing the elongated portion of the spring in the direction of the stops, whereby the tension of the spring is increased, substantially as set forth. v

2. In a tilting device for a chair, the combination, with an upper and a lower casting hinged together, of a spring immovably connected with the lower casting and provided at its center with a forwardly-proj ecting loop,

specification in the presence of two subscribing witnesses.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5630647 *May 26, 1995May 20, 1997Steelcase Inc.Tension adjustment mechanism for chairs
US5630649 *May 26, 1995May 20, 1997Steelcase Inc.Modular chair construction and method of assembly
US5782536 *Feb 17, 1995Jul 21, 1998Steelcase Inc.Modular chair construction and method of assembly
US5873634 *Jan 8, 1998Feb 23, 1999Steelcase Inc.Modular chair construction and method of assembly
US5979988 *Dec 31, 1998Nov 9, 1999Steelcase Development Inc.Modular chair construction and method of assembly
Cooperative ClassificationE05F1/1215