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Publication numberUS2568988 A
Publication typeGrant
Publication dateSep 25, 1951
Filing dateOct 2, 1950
Priority dateOct 2, 1950
Publication numberUS 2568988 A, US 2568988A, US-A-2568988, US2568988 A, US2568988A
InventorsChilds Wyatt Bentley
Original AssigneeChilds Wyatt Bentley
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dentist's chair
US 2568988 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

Sept. 25, 1951 w. B. CHILDS 2,568,988

DENTIST'S CHAIR Filed 001;. 2, 1950 2 Sheets-Sheet 1 IN V EN TOR.

viii/4445 2 Sheets-Sheet 2 Filed Oct. 2, 1950 INVENTOR.

wmm, 001%, @LU'MML 9 MTW Patented Sept. 1951 v "n N'ris'rs 01mm Wyatt Bentley Childs, amie... Application oet ber 2, 1950," Serial No. 187,987

" 7Claims. (o1. 155 157) This invention relates to improvements indentists chairs and has for an object the provision of a chair which will afford adequate support for the body in the various positions assumed in the treatment of patients and in the manipulation of dental equipment, thereby minimizing muscular strain. v 7 e The present application is a continuation-inpart of my co-pending application, Ser. No. 45,-

270, filed August 20, 1948, now abandoned.

, to another by hand, which entails awkward,

cumbersome movements of the dentist while operating. In addition, this type of rest stool does not provide any horizontal support to the back or body, while the operator, of necessity, must work in a leaning or strained position.

Other efforts to solve these problems have not proved satisfactory. Equipment that is attached to the patients chair, as well as equipment which is fastened or attached to the dental chair base, are extremely inflexible and limit the range of operative procedures necessary in the dental operating room. As a result, dentists are forced to work in an abnormal postural position atthe dental chair, forcing the vital abdominal organs into a cramped position, which in turn results [in circulatory disturbances, hypertension, car- I diovascular changes, sacroiliac strain, scoliosis or curvature of the spine, leg, ankle and foot pains, impinged nerves, muscle strain, and other h complications.

It is therefore an object of the invention to I provide a dentists chair havinga body rest sup- I ported on the chair for generally horizontal swinging movement, so that the rest may readily be positioned to engage and support the chair occupant at the back or at either' side. In the preferred embodiment of the invention, the chair is provided with a seat of the saddle type, sup ported for rotation on the chair base about a generally vertical axis, whereby with appropriate adjustment of the relative positions of the seat and the rest, the rest may be caused to engage Z and support the occupant at the front, aswell "as at theback or the sides.

l "I 1.3, More specifically, it is an object of the invention to provide a'dentists chair having a caster supportedbase, provided with an annular foot rest, a seat support rotatably mounted on said base, a seat rotating with said support, and 'a body rest mounted on said seat support for horizontal swinging movement, the body rest having an arcuate configuration so'as to embrace partially the body of the occupant, whereby support may be afforded in any direction-in which the occupant leans.

Further objects and features of the invention will be apparent 'from the following description taken in connection with the accompanying drawings in which Figure l is a side elevation of a dentists chair embodying the principles of the invention;

Figure 2 is a plan view of the chair shown in Figure 1; I

Figure 3 is a horizontal'section on the line Figure 4 is a fragmentary enlarged view, partly in section, of part of the structure shown in Figure 1; I

Figure 5 is a horizontal-section onthe lin 5--5 of Figure 4; Y i

ure3.

In order to facilitate an understanding of th invention, reference is made to'the 'referredconstruction shown in detail in the drawings, and specific language is employed to describe the same. ;It will nevertheless be understood that no limitation'of the scope of'the invention is thereby intended, such modifications and alterations or the illustrated embodiment being contemplated as would normally occur to those skilled in the art.

Referring first to Fig. I, it will be observed that the chair consists essentiallyof' a pedestal ill, a seat I l and a body rest I2 the seat ll being of the saddle type commonly used in cycle sad-- dles, and the body rest I2 being curved in a horizontal plane to partially embrace the body. The pedestal is supported on the floor by 'aplurality of radially extending legs-l4 rigidtherewith, each leg being provided with'a conventional caster l5, mounted in the outer, downwardly-directed portion l3 of the leg. An-annular foot rest 5 preferably encircles' the pedestal base, being received in an -arcuate recess formed in the upper surface of each leg l4 and being secured rigidly therein by a threaded element l8. By means of this arrangement, the chair may readily be propelled about the floor by the occupant to any convenient position, displacement of the chair by pushing with the feet being facilitated by the shape of the seat, the horn portion of the seat extending between the occupants legs. I

As hereinbefore eii'plained, the body "rest |2, and preferably the seat II, are supported on the pedestal It! for rotation about generally vertical axes. The axes of pivotal movement of the seat and the body rest are adjacent and may-be:co-

incident, but are preferably slightly displaced laterally, as illustrated in the drawing. The word adjacent, as employed herein, is -used-to define either coincidence or ofis'et relation of the two axes as in the preferred and illustrated embodiment of the invention.

- -Thusfas shown'in Figure l'ofthedrawing'the seat may comprise asupportingmetal plate -20, curved as shown in 1 the drawing to :facilitate the :shaping of the seat proper-2|, which may :be formedof suitable'padding covered byleather -=in"a' conventional manner, and is -carried-=ona iplate'n, shapedto conform to the central por- -tion'of the :plate and-bolted=theretoas-shown 'at fl. Tubular bosses-24 and -areunited'with -p1ate 22-to formtherewith an integral structure, for instance by welding. Boss -24 is rotatably mounted on the pedestal 10 in manner- -herein- 'afte'r mo'refully described,'-so as totpermit rotation ofseat about a vertical-axis, -while-boss 25 serves as a mounting for thebody-rest --and "defines the vertical axis about which the rest may be rotated'as hereinbefore mentioned.

For this latter purpose, a "spindle '2 I -.provided at its lower end with a collar 28 is received'within and secured to boss 25 by a set-screw 29, and a bracket 32, integral with an arm '3l which aupports the body rest I2, is journalled -for =rota- 'tion on spindle-21' intermediate boss 25-and'collar 28, the arm 30 extending laterally and upwardly from its axis of rotation, as illustrated in Figures 1 and 3. Arm 30 may be formed, throughout the majoriiportion F of its-length, of :metal tubing, welded or otherwise integrally secured adjacent its lower'end to the'bracket 32. Within-theup per end of arm 30 is received with a sliding fita tubular spindle '36. -A collar 36 "embraces the arm 30, being shrunk or otherwise secured ;on the upper end of the latter. *A set-screw 38, threaded within collar- 36, is arranged to engage selectively with'any one of a series of recesses -or indentations 39 in'the-outer surface of spindle '35, whereby the spindle may be adjusted vertically with respect to arm -30 and retained in vertically adjustedposition. In lieu of'recesses orindentations of the nature'shown, spindle may be provided with a series of spaoed'annular grooves, whereby the body rest maybe -adjusted 'in a horizontal plane about the axis defined by :the upper end of arm 30, although such rotary adjustment of the rest is ordinarily not'necessary as Lucite, to give to' thebody rest adequate depth and to improve the appearance thereof without unduly increasing its weight,-the member 4| being bolted or otherwise rigidly secured .to 'the base =-and support the 'operativeat the back, one side, or

at the front, these several positions of the rest being indicated in Figure l of the drawing by the full and dotted line representations. Since thearm 30 is supported for pivotal movement on the seat, slightly to the rear of the vertical air-isof the seat, this swinging movement of the rest-is limited only by engagement of the arm '30 with'the edge of the seat at either side of the latter.

The base In of the'chair may be formed as hereinbefore described, the legs l4 merging'into a hub 44 whiohis apertured-at 41 to receive=a sleeve 43 forming part of the pedestal on which the sleeve is'mounted. Received within the upper end-of the sleeve, and secured thereto'by set-screw 45, is the reduced end of an-annular element 46, which receives in turn the :reduced lower end of a further annular element 48, the dimensions being such that element 48 may rotate in element 46. 'At itslower end, element 48 is threaded to receive -a nut 5| which bears against a washer 52, whereby vertical displacement of element 48 isprevented, and an-antifriction bearingBSQinterposed between the upper end of element 46 and the opposed annular shoulder presented by element '48 may be .pro-

vided to transmit the loadbetweenthe seat and the base.

A spindle 58 isreceived within-and'suitably secured to the seatboss 24, and projects downwardly through the pedestal structure just' described, being slidably received therein. At one side, the spindle 58 isrecessed to form a series .of ratchet teeth 59, and -a cooperating spring- "rtaine'd'in the elevated'position; lowering of 'the seat is readily effected by withdrawing thepawl6 It will thus be observed that in theillustrated embodiment of the invention, there is provideda seat structure rotatable on the base of the chair about a generally verticalaxis, and'a bo'dy re'st mounted for swinging movement on the seat structure, the body rest being located laterallyof "and remote from "the axis on which it lswings,

whereby the seat and body restmay 'rot'atetogether'on'thechair base, or the body rest may be rotated through a'wide angle with respect'to the seat, so that the body rest may embr'acethe occupant at the back, at either side, orat'the front, thebody being thus adequately supported in any direction in which the occupant "may lean. Furthermore, the structure is such asto provide for vertical adjustment of the seat, independent vertical adjustment of the body rest, and

afoot rest so mounted on thebase as to'pr'event loosening or displacement.

The invention contemplates such-further addi- 40. The rest I2 -may, alternatively, comprise -76 tions and'alte'rations as would normallyfocoiifto those skilled in the art to which it relates. Various features of the invention may be separately employed, and combinations of these features, or of any of them, with known structures are comprised within the invention.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A dentists chair, comprising, in combination, a base, a seat structure supported on said base for rotation about a generally vertical axis, and a body rest supported on said seat structure, said rest extending upwardly from said seat structure and including a body engaging portion, means mounting said body rest on said seat structure for pivotal movement about a generally Vertical axis adjacent said first-named axis, said body engaging portion being remote from the rest axis, whereby said body engaging portion may be swung through a substantial arc to engage with either side or with the back of an occupant of the chair without rotating said seat structure.

2. A dentists chair, comprising, in combination, a base, a saddle seat and a body rest supported on said base, said body rest extending upwardly from said seat and including a horizontally curved body embracing portion, and means mounting said body rest for pivotal movement about a generally vertical axis adjacent the central portion of said seat, said body engaging portion being remote from said axis, whereby said body rest may be swung through a substantial arc to engage with either side or with the back of an occupant of the chair, and means mounting said seat for rotation on a generally vertical axis.

3. A dentists chair, comprising, in combination, a base, a seat support mounted on said base for rotation about a generally vertical axis, a seat and a body rest carried on said support, said rest extending upwardly from said seat and including a body engaging portion, and means mounting said rest on said seat support for pivotal movement about a generally vertical axis displaced laterally of but adjacent to said first named axis, said body engaging portion being remote from the rest axis, whereby said body engaging portion may be swung through a substantial arc to engage with either side or with the back of an occupant of the chair without rotating said seat, and whereby said body engaging portion may be rotated with said seat about said first named axis.

4. A dentists chair, comprising, in combination, a base, a seat support mounted on said base for rotation about a generally vertical axis, a saddle seat carried on and rotating with said support, and a body rest carried on said seat support, said rest extending outwardly of and upwardly from said seat and includin a body engaging portion of arcuate configuration in a horizontal plane, and means mounting said rest on said seat support for pivotal movement about a generally vertical axis displaced laterally of but adjacent to said first named axis, said body engaging portion being remote from the rest axis, whereby said body engaging portion may be swung through a substantial arc to engage with either side or with the back of an occupant of the chair without rotating said seat, and whereby said body engaging portion may be rotated with said seat about said first named axis.

5. A dentists chair, comprising, in combination, a base, a seat and a body rest supported on said base, means mounting said seat on said base for vertical adjustment and rotation on a vertical axis with respect to said base, said body rest including an arm extending laterally and upwardly from the central portion of said seat, and a body engaging portion curved in a horizontal plane, said body engaging portion being mounted on said arm for vertical adjustment with respect thereto, and means mounting said arm for pivotal movement about a generally vertical axis offset from the axis of rotation of said seat, whereby said body engaging portion may be swung through a substantial arc to engage with either side or with the back of an occupant of the chair.

6. A dentists chair, comprising, in combination, a base, a seat journalled for rotation on said base about a vertical axis, and a body rest supported on said base, said body rest including an arm extending laterally and upwardly from the central portion of said seat, and a body engaging portion curved in a horizontal plane, said body engaging portion being mounted on said arm for vertical adjustment with respect thereto, means mounting said arm on and beneath said seat for pivotal movement about a generally vertical axis adjacent the central portion of said seat and on an axis displaced from the axis of said seat, whereby said body engaging portion may be swung through a substantial arc to engage with either side or with the back of an occupant of the chair.

'7. A dentists chair, comprising, in comb-ination, a base, a seat structure supported on said base for rotation about a generally vertical axis, and a body rest supported on said seat structure, said rest extending upwardly from said seat structure and including a body engaging portion, means mounting said body rest on said seat structure for pivotal movement about a generally vertical axis, whereby said body engaging portion may be swung through a substantial arc to engage with either side or with the back of an occupant of the chair without rotating said seat structure, said base comprising a hub portion, a plurality of legs extending laterally from said hub portion, and an annular foot rest secured to said legs, said legs being recessed to receive and partially embrace said foot rest.

WYATT BENTLEY CHILDS.

REFERENCES CITED The following references are of record in the file oi" this patent:

UNITED STATES PATENTS Number Name Date 527,056 Gilson Oct. 9, 1894 566,382 Dow Aug. 25, 1896 1,322,551 Efaw Nov. 25, 1919 1,756,210 Racz Apr. 29, 1930

Patent Citations
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US1322551 *Mar 21, 1919Nov 25, 1919 Best attachment fob babbeb-chaibs
US1756210 *Jan 23, 1928Apr 29, 1930Burroughs Adding Machine CoChair
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2685325 *Jun 23, 1951Aug 3, 1954Webster Wesley JamesInvalid cart
US2712348 *Mar 22, 1954Jul 5, 1955John E CooperDental stool having a rotatable motor control support
US2909212 *Jul 7, 1958Oct 20, 1959Cramer Posture Chair Company ISpring loaded locking mechanism for chair pedestal
US3029106 *May 13, 1959Apr 10, 1962John O McguireSurgeon's operating chair
US3342528 *Dec 13, 1965Sep 19, 1967Bostrom CorpSidewardly adjustable seat back
US3726560 *Aug 23, 1971Apr 10, 1973R PageStool
US3997180 *Jun 25, 1975Dec 14, 1976Marble Industries Co., Ltd.Baby carriage
US4452487 *Aug 11, 1981Jun 5, 1984Dentsply Research & Development Corp.Operatory stool with adjustable arm
US4832407 *Nov 27, 1987May 23, 1989Hector SerberVariable posture chair and method
US5383704 *Oct 13, 1993Jan 24, 1995L.A. Rumbold LimitedIntermediate armrest for a row of seats
US5433552 *Feb 28, 1994Jul 18, 1995Thyu; Chorng-ThyongSeat pillar lock device for exercising machines
US5490716 *Jul 25, 1994Feb 13, 1996Naughton; Michael L.Surgeon's chair
US5695250 *Feb 5, 1997Dec 9, 1997Lin; Chen-DaChair with swivel seat and backrest
US5967610 *Jan 26, 1998Oct 19, 1999Lin; Chen-DaChair with swivel seat and backrest
US7090303 *Jun 5, 2003Aug 15, 2006William KropaRehabilitation training and exercise chair
US7618090 *Dec 6, 2006Nov 17, 2009Distribution Gablex Inc.Abdominal support swivel chair
US8740307 *Jul 20, 2011Jun 3, 2014Mathai A. ThomasNeck supporting assembly
US20070246990 *Dec 6, 2006Oct 25, 2007Distribution Gablex Inc.Abdominal support swivel chair
DE1115421B *Aug 1, 1958Oct 19, 1961Matthias ZellerSitzmoebel mit gegeneinander geneigten Flaechenteilen des Sitzes
DE3129116A1 *Jul 23, 1981Apr 8, 1982Syntex IncOperationsschemel
Classifications
U.S. Classification297/344.26, 297/383, 297/353, 297/487, 297/344.18
International ClassificationA61B19/00
Cooperative ClassificationA61B19/28
European ClassificationA61B19/28