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Publication numberUS720549 A
Publication typeGrant
Publication dateFeb 17, 1903
Filing dateSep 4, 1902
Priority dateSep 4, 1902
Publication numberUS 720549 A, US 720549A, US-A-720549, US720549 A, US720549A
InventorsAdalbert Adler
Original AssigneeAdalbert Adler
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Adjustable seat.
US 720549 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

PATENTED FEB. 17:, 1903. A. ADLER. 1




Zfz'fn e83 es I In van for:




SPECIFICATION forming part of Letters Patent NO. 720,549, dated February 17, 1903.

Application filed September 4, 1902. Serial No. 122,062. (No model.)

To aZZ whom it may concern.-

Be it known that I, ADALBERT ADLER, a subject of the German Emperor, residing at Oonstance-on-the-Bodensee, in the Grand Duchy of Baden, Germany, have invented certain new and useful Improvements in Adjustable Seats; and I do hereby declare the following to be a full, clear, andexact de ments in chairs, stools, and the like adjustable as to height, the object of the improvement being to render the chair also rotatable.

In the annexed drawing, which is an elevation, partly in section,the invention is illustrated as applied to a music or piano stool.

In a tube a, forminga central upright from the tripod, another tube b is guided and serves as a support for the seat a. The latter can be adjusted at any desired height by telescoping one tube into the other,when the seat is fixed by jamming the ballse between the coupling-cone d, connected to the foot of the seat-support b,and the inner wall of the guidetube a, and thus coupling the two tubes as by a friction-clutch. The balls e rest on a plate adapted to be moved by means of a hand-lever h and rod g. A springt bears continuously on the'lever h, so that in the normal position the rod g is pulled upward, and the plate f is therefore also raised. The balls 6 are consequently jammed in between 01 and a and fix the seat both at its adjusted height and against rotation.

When the height of the seat is to be altered, the lever h is pushed or pulled by hand in the direction opposed to the spring-pressure, the rod g slides downward withthe plate f, and the balls are released, so that the tubes CL and Z) are uncoupled from each other, and

then by manually lifting or lowering the seat the desired adjustment is attained, the lever released, and the tubes once more coupled by the action of the spring.

So far the construction of the chair is known,

and that which hasv been described forms no part of the invention.

The improvement consists in thisthat in When by means of the plate g the chair is adjusted at the desired height, the seat 0 can still be rotated, since the support I), with its sleeve 70, moves on the extension Z of the cone d, which is rigidly held by the balls.

What I clainnand desire to secure by Letters Patent, is

The combination, to form an adjustable and rotatable seat, of the seat-support?) having a conical box at its lower end the tubular upright a in which said support telescopes, the coupling-cone d loosely'connected to the foot of the support and having the conical upper extension Z journaled in the aforesaid box, the balls, and means for jamming said balls between the coupling-cone and the tubular upright.

In testimony whereof I aflix my signature in presence of two witnesses.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2469896 *Jun 15, 1945May 10, 1949Schaef Harold MAdjustable pedestal stool
US2529861 *Sep 1, 1945Nov 14, 1950White S Dental Mfg CoAdjustable seat supporting structure
US2742082 *Aug 23, 1954Apr 17, 1956Chromcraft CorpHeight-adjustable stools
US3058715 *Apr 27, 1959Oct 16, 1962Porkka Eero JAdjustable stool
US3228647 *Dec 11, 1963Jan 11, 1966Nouvelle Soc MirimaLocking device for seats and the like
US3312437 *Oct 23, 1965Apr 4, 1967Barth ValerieTilted stool
US4033543 *Jul 15, 1975Jul 5, 1977Anonima Castelli S.P.A.Device for adjusting the height of the seat of arm-chairs and the like
US4460141 *Oct 6, 1981Jul 17, 1984Elajo Invest AktiebolagSelf-locking support clamp for mounting items on a support bar
US4601246 *May 7, 1984Jul 22, 1986Thill, Inc.Support assembly for overbed table
US4922836 *Dec 1, 1988May 8, 1990Thill, Inc.Lead screw support mechanism for an overbed table
US5393125 *May 28, 1993Feb 28, 1995Steelcase Inc.Height adjustable chair arm assembly
US5439267 *May 28, 1993Aug 8, 1995Steelcase Inc.Chair with adjustable arm assemblies
US7658359Feb 9, 2010Steelcase Development CorporationLoad compensator for height adjustable table
US8091841Jan 10, 2012Steelcase Inc.Load compensator for height adjustable table
US20060130713 *Dec 16, 2005Jun 22, 2006Steelcase Development CorporationLoad compensator for height adjustable table
US20060130714 *Dec 16, 2005Jun 22, 2006Steelcase Development CorporationLoad compensator for height adjustable table
US20060145036 *Dec 16, 2005Jul 6, 2006Steelcase Development CorporationHeight adjustable table
US20070137535 *May 2, 2006Jun 21, 2007Steelcase Development CorporationLoad compensator for height adjustable table
Cooperative ClassificationA47C9/08, A47C3/26
European ClassificationA47C9/08, A47C3/26