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Publication numberUS1836630 A
Publication typeGrant
Publication dateDec 15, 1931
Filing dateJul 16, 1928
Priority dateJul 16, 1928
Publication numberUS 1836630 A, US 1836630A, US-A-1836630, US1836630 A, US1836630A
InventorsThum Martin
Original AssigneeThum Martin
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Chair
US 1836630 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

I M. THUM 1,836,630

CHAIR Filed July 16, 1928 2 Sheets-Sheet 1 o -lNVENTOR M ATTORNEY Dec. 15, 1931.

M. THUM 1,836,630 CHAIR Filed July 16, 1928 2 Sheets-Sheet 2 M ATTORNEY Patented Dec. 15, 1931 1 UNITED STATES MARTIN THUM, OF ROCHESTER, NEW YORK CHAIR Application filed July 16,

The present invention relates to chairs and an object thereof is toprovide a chair which will permit the body of a person seated thereon to swing at the hips to different positions without shifting the positions of the legs between the hip joints and the knees and without shifting the knee joints with reference to the floor or surface on which the chair rests.

To this and other ends, the invention consists of certain parts and combinations of parts all of which will be hereinafter described, the novel features being pointed out in the appended claims.

In the drawings;

Fig. 1 is a side view of a chair constructed in accordance with this invention, parts being in section and the chair being shown with the back slightly tilted to the rear;

Fig. 2 is a bottom view of the seat with parts broken away;

Fig. 3 is a vertical fragmentary section through the chair showing the back thereof in normal position;

Fig. 4 is an enlarged section through the chair seat on the line 44, Fig. 5; and

Fig. 5 is a section on the line 5-5, Fig. 4.

In the illustrated embodiment of the invention, there is provided a lower base portion 1 in which a screw spindle 2 of any suitablev form may turn. This spindle 2 has at its upper end a head 3 which is rigidly secured to i the spindle and which is provided with two forwardly projecting arms 5 bolted or riveted at 6 rigidly to the head 3 and forming a frame or support for a forward seat portion 7 which is secured by screws 8 to said forwardly projecting arms 5.

Pivoted at 9 to the forward supporting frame is a frame 10 which forms a support for a rear seat portion 11, the rear seat portion being secured by screws 12 to the upper face of said frame 10. Depending from the frame 10 is a guide ear 13 which surrounds the guide bolt 14, the inner end of which ex- 1928; Serial No. 293,180.

tends throughan ear 175 on the head 3, and the outer end of which is screw threaded at 16 and has a nut 17- adjustablethereon. A helical spring 18 surrounds this guide bolt and one end abuts a washer 19 while the other end abuts a washer 20. The washer 19 abuts the ear 13 whereas the washer 20 abuts the nut .17. It is to be seen that this spring 18 normally holds the rear seat portion 10 in a horizontal plane with the front seat portion 7 but permits the rear seat portion 10 to swing downwardly about'the pivots 9 as an axis. The rear seat portion 10 may have a back 21 projecting upwardly to the rear edge thereof while arms 22 may connect this back with the forward portion of the rear seat portion 11.

A chair constructed in accordance with this invention permits the user to swing rearwardly about the hips as a pivot without shifting the leg portions between the hips and the knee joint. As the front seat portion 7 has a substantially fixed position with reference to the-flooring upon which the chair rests, the knee joints do not shift and the feet may be maintained on thefioor notwithstanding the. position on the back of the chair. This chair automatically adapts itself to the position of the back of the user without any movement ofthe legs, thus permitting the feet to main tain a uniform position on the fioorfor any back adjustment.

What I claim as my invention and desire to secure by Letters Patent is z.

1. A chair embodying aseat for one person formed of two sections, a front section and a rear section, means supporting the front section in "a rigid position, resilient means supporting the rear section in a normal position substantially in'a horizontal planewith the front section so that it will swing downwardly at its rear edge about an axis adjacent the rear edge of the front section, and a back projecting upwardly from the rear part of the rear section.

2. A chair embodying a seat for one person formed on two sections, a front section and a rear section, means supporting the front section in a rigid position, means supporting the rear section so that it will swing downwardly at its rear edge about an axis adjacent the rear edge of the front section, a back projecting upwardly from the rear part of the rear section, and means resiliently resisting the downward movement of the rear section.

3. A chair comprising a base, a screw spindle adjustable on the base, a frame secured to the upper end of the screw spindle, a forward seat portion held against movement on said frame, a rear seat portion pivotally connected to said frame, a resilient means opposing the movement of the rear seat portion.

4c. A chair comprising a base, a screw spindle adjustable on the base, a frame mounted at the upper end of said screw spindle, a forward seat portion held against movement on said frame, a rear seat portion pivotally connected with the frame, a guide bolt projecting from said frame, an ear on the rear seat portion movable on said guide bolt, and a spring surrounding said guide bolt and opposing the movement of' the pivotally mounted rear seat portion.

5. A chair embodying a base, a single seat supported by said base and having a forward rigid section and a swinging rear section, and means situated at the adjacent edges of the two sections to hold them in seat forming position and permitting a limited downwardly swinging movement of the rear seat section under pressure.

6. In a chair, the combination with a seat having two sections, one in front of the other, both sections being normally in the same plane, of a supporting means having a rigid extension, one of said seat sections being rigidly mounted on said extension and the other section being pivotally connected to said extension permitting said latter section to move downwardly from normal position when under pressure.

7. A chair comprising a base, a seat formed of two sections one in back of the other, means supporting the front section against downward movement on the base, means supporting the back seat member to swing downwardly at its rear edge relatively to front seatmember, a back projecting upwardly from the rear portion of the back seat section, and resilient means resisting the downward movement of the back seat section.

8. A chair comprising a base, a single, seat formed of two sections, one in front of the other, a back projecting upwardly from the rear section, means rigidly supporting the front section on the base, means pivotally supporting the rear section on the base to swing downwardly from a normal'position, and. resilient means opposing the downward and permit it to swing downwardly from a normal position about a horizontal axis adjacent the rear edge of the front section, and a back projecting upwardly from the rear portion of the rear section.

MARTIN THUM.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2428087 *Jun 30, 1943Sep 30, 1947Markus Frederick EFurniture
US3368844 *Oct 17, 1966Feb 13, 1968Doerner Products Co LtdChair control for tilting and swivel chairs having improved tensioning bolt
US3446532 *Mar 13, 1967May 27, 1969Cramer Harold WChair
US3572829 *Dec 2, 1968Mar 30, 1971Companie Nationale Air FranceTiltable air plane seat
US3741607 *Oct 5, 1970Jun 26, 1973H CramerChair
US4521053 *Jun 16, 1982Jun 4, 1985Gispen+Staalmeubel B.V.Chair
US4560199 *Mar 9, 1984Dec 24, 1985Pamont AgRecliner chair
US5203606 *Dec 17, 1990Apr 20, 1993Michele A. ChiarellaTwo section-bicycle saddle with movable front section
US5716099 *Aug 14, 1996Feb 10, 1998Novimex Fashion Ltd.Chair with split reclining seat
US5755490 *Feb 4, 1997May 26, 1998Steelcase StraforOffice chair structure
US5871258 *Oct 24, 1997Feb 16, 1999Steelcase Inc.Chair with novel seat construction
US5913568 *Sep 30, 1997Jun 22, 1999Brightbill; Stephen T.Two platform motion seat
US6193313 *Oct 10, 1999Feb 27, 2001Jonber, Inc.Chair
US6340207May 5, 1999Jan 22, 2002Dual Seat TechnologiesTwo platform motion seat
US6357827Mar 27, 2000Mar 19, 2002Dual Seat Technologies, Inc.Two platform motion seat
US6394548Oct 20, 2000May 28, 2002Steelcase Development CorporationSeating unit with novel seat construction
US6499802 *Mar 28, 2001Dec 31, 2002Art Design International Inc.Articulated seat
US8714645 *Jan 28, 2011May 6, 2014Sava CvekPivoting mechanism with gross and fine resistance adjustment
US8714646 *Feb 8, 2011May 6, 2014Sava CvekMobile task chair and mobile task chair control mechanism with adjustment capabilities and visual setting indicators
US20120025578 *Jan 28, 2011Feb 2, 2012Sava CvekPivoting Mechanism with Gross and Fine Resistance Adjustment
US20120032484 *Feb 8, 2011Feb 9, 2012Sava CvekMobile Task Chair and Mobile Task Chair Control Mechanism with Adjustment Capabilities and Visual Setting Indicators
DE4040139A1 *Dec 15, 1990Jun 17, 1992Link Wilhelm KgOffice chair with divided seat - has articulated lever system for controlled adjustment between backrest and seat
EP0105955A1 *Oct 13, 1982Apr 25, 1984Martin Stoll GmbHChair
EP0499649A1 *Jan 24, 1991Aug 26, 1992Rolf VölkleChair, in particular for children and adolescents
EP2127942A2 *Jan 17, 2002Dec 2, 2009Eduard LanzSeat, especially for a vehicle
EP2179681A1 *Oct 2, 2009Apr 28, 2010Hartog Maarten Antoon Nicolaas DenWork chair with foreward tiltable seating part and support for upper body
WO2000015080A1 *Aug 20, 1999Mar 23, 2000Jonber IncChair
WO2001076420A1 *Apr 4, 2001Oct 18, 2001Hansen Brian AabyA chair
WO2006114311A1 *Apr 27, 2006Nov 2, 2006Bock 1 Gmbh & Co KgSeating, especially office chair
Classifications
U.S. Classification297/302.4, 297/312, 297/326, 297/303.5
International ClassificationA47C3/026
Cooperative ClassificationA47C7/441, A47C7/024, A47C7/443
European ClassificationA47C7/02C, A47C7/44A, A47C7/44D