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Publication numberUS3823979 A
Publication typeGrant
Publication dateJul 16, 1974
Filing dateJan 11, 1973
Priority dateJan 11, 1973
Publication numberUS 3823979 A, US 3823979A, US-A-3823979, US3823979 A, US3823979A
InventorsDavis R
Original AssigneeDen Tal Ez Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dental chair
US 3823979 A
Abstract
A dental chair comprising a seat portion having a back portion pivotally secured thereto. A lever element is secured at its upper end to the lower center portion of the back portion and is pivotally secured at its lower end to the rearward end of a clevis element. The lever element is pivotally secured, above its lower end, to the seat portion. The forward end of the clevis element is secured to a sleeve which is threaded onto the screw shaft of an electric motor for longitudinal movement thereon. Movement of the sleeve by the screw shaft causes the clevis element to act upon the lower end of the lever element thereby causing the lever element and the back portion to pivot about the pivotal connection of the lever element and the seat portion.
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Description  (OCR text may contain errors)

United States Patent 119 Davis, Sr.

[ 4] DENTAL CHAIR 75] Inventor: Roderick W. Davis, Sr., Des Moines, 1

Iowa

[73] Assignee: Den-Tal-Ez Mfg. Co., Des Moines,

Iowa

[22] Filed: Jan. 11, 1973 [21] Appl. No.: 322,756

[52] U.S. Cl. 297/330 [51] Int. Cl A47c 1/02, A47c 1/06, A470 H12 [58] Field of Search 297/330, 341, 342, 346, 297/347, 348, 317, 83, 71; 248/421, 3.93

[56] References Cited UNITED STATES PATENTS 3,331,997 5/1968 Fritz et a1. 297/330 3,578,379 5/1971 Taylor et a1. 297/330 3,588,170 6/1971 Knabusch 297/330 3,596,982 8/1971 Grams 297/330 July 16, 1974' 3,719,391 3/1973 Neri 297/330 v Primary ExaminerPaul R. Gilliam- 57 ABSTRACT A dental chair comprising a seat portion having a back portion pivotally secured thereto. A lever element is secured at its upper end to the lower center portion of the back portion and is pivotally secured at its lower end to the rearward end of a clevis element. The lever element is pivotally secured, above its lower end, to

the-seat portion. The forward end of the clevis element is secured to a sleeve which is threaded onto the screw shaft of an electric motor for longitudinal movement thereon. Movement of the sleeve by the screw shaft causes the clevis element to act upon the lower end of the lever'element thereby causing the lever element and the back portion to pivot. about the pivotal connection of the lever element and the seat portion.

' 9-Claims, 6 Drawing Figures 1 DENTAL CHAIR BACKGROUND OF THEINVENTION This invention relates to dental chairs and more particularly to the means for pivoting the back portion of the dental chair with respect to the seat portion. The seat backs of conventional dental chairs are comprised of a heavy frame which surrounds the seat back. The heavy frame is ordinarily constructed of cast metal and is extremely expensive. Further, the conventional dental chairs do not have a simple but efficient means for controlling the pivotal movement of the back portion of the dental chair with respect to the seat portion.

Therefore, it is a principal object of the invention to provide an improved dental chair.

A further object of the invention is to provide a dental chair having means thereon for pivoting the back portion of the chair with respect to the seat portion of the chair.

A further object of the invention is to provide a dental chair having a back portion comprised of a hollow frame having plywood members and upholstery material mounted thereon.

A further object of the invention is to provide a dental chair having an electric motor associated therewith for pivotally moving the back portion of the chair.

A further object of the invention is to provide a dental chair having a novel means for pivotally connecting the back portion tothe seat portion of the chair.

A further object of the invention is to provide a dental chair which is economical in manufacture, durable in use and refined in appearance.

These and other objects will be apparent to those skilled in the art.

BRIEF DESCRIPTION OF THE DRAWINGS This invention consists in the construction, arrangements and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, specifically pointed out in the claims, and illustrated in the accompanying drawings, in which: 1

FIG. 1 is a perspective view of the dental chair of this invention;

FIG. 2 is a plan view as seen along lines 2 2 of FIG. 1 with portions thereof cut away to more fully illustrate the invention;

FIG. 3 is an enlarged sectional view seen along lines 3 3 of FIG. 2;

FIG. 4 is a sectional view similar to FIG. 3 except that the back portion has been pivotally moved upwardly with respect to the seat portion;

FIG. 5 is an exploded perspective view of the lever element and clevis element; and

FIG. 6 is an enlarged sectional 6 6 of FIG. 2.

DESCRIPTION'OF THE PREFERRED EMBODIMENT The numeral 10 refers generally to the dental chair of this invention comprising a seat portion 12 having a view seen along lines I back portion 14 pivotally secured thereto. Seat portion Motor 26 is operatively secured to the brace 20 and has a horizontally extending screw shaft extending rearwardly therefrom. Sleeve 30 is threadably mounted on shaft 28 for longitudinal movement thereon. The numeral 32 refers to a clevis element having forwardly ex- I tending arms 34 and 36 which are secured to sleeve 30 by pins 38. Clevis element 32 includes a rearward end portion 40 which is slightly offset with respect to the arms 34 and 36 and which is positioned in a plane below the arms 34 and 36. Clevis element 32 also includes a pair of rearwardly extending arms 42 and 44.

The back portion 14 is comprised of a hollow frame 46, a front layer of plywood 48, a rear layer of plywood 50, a detachable back panel 52, and an upholstered gitudinally moved on the screw shaft 28 thereby causing clevis element 32 to act upon the lower end of lever element 58 at 66 to" pivot the back portion 14 about 64.

Limit switches 68 and 70 are mounted on the frame 16 in the movable path of arm 72 which is secured to clevis element 32. The limit switches 68 and 70 are electrically connected to motor 26 to deactivate the same at the extreme limits of travel of the sleeve 30 to prevent damage to the various components.

It can be seen from the foregoing that back portion 14, due to the construction thereof, is much more economical to manufacture than existing dental chairs. It canalso be seen that the novel means for pivotally moving the back portion 14 with respect to the seat portion 12 represents a distinct improvement in the art.

' The design relationship between the lever element 58,

a seat portion comprising a frame means and having rearward and forward end, a back portion having upper and lower ends, anelectric motor secured to said frame means having a rearwardly extending screw shaft, a member'threadably mounted on said screw shaft for longitudinal movement thereon, a clevis element having rearward and forward ends said clevis element having a first pair of spaced apart arms at its forward end secured to said member, and a second pair of spaced apart arms at its rearward end,

a lever element having upper and lower ends, the upper end of said lever element being secured to said back portion, the lower end of said lever element being pivotally arms of the rearward end of said clevis element,

and means pivotally connecting said lever element above its said lower end to said frame means whereby activation of said motor will cause the rearward end of said clevis element to act upon the lower end of said lever element topivot said back portion about the pivotal connection between said lever element and said frame means.

2. The dental chair of claim 1 wherein said back portion comprises a hollow frame member having front and back panels secured thereto, said lever element being secured to said front panel.

secured to the spaced apart 3. The dental chair of claim 2 wherein said panel has an access opening provided therein in communication with said upper end of said lever element.

4. The dental chair of claim 1 wherein said second pair of arms dwell in a plane below said first pair of arms.

8. The chair of claim 1 wherein said clevis element has a limit switch actuating arm which deactivates said motor at the extreme limits of travel of said member threadably mounted on said screw shaft, thereby preventing damage to the components of said chair.

9. The chair of claim 8 wherein the rearward end portion of said .clevis element is slightly offset with respect to the forward end portion of said clevis element.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3381997 *Sep 6, 1966May 7, 1968Edward E. FritzAdjustable chair
US3578379 *Dec 28, 1967May 11, 1971Pennwalt CorpAdjustable chair
US3588170 *Jul 3, 1969Jun 28, 1971La Z Boy Chair CoMotor-operated reclining chair
US3596982 *May 15, 1969Aug 3, 1971Surgical Mechanical Research IPatient{3 s chair
US3719391 *Mar 24, 1971Mar 6, 1973Neri VChair for use in dentistry
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4802683 *Aug 10, 1987Feb 7, 1989Gillum Sr J TWheelchair width reducing attachment
US5214360 *Mar 13, 1992May 25, 1993Den-Tal-Ez, Inc.Programmable adjustable chair for medical and dental applications
US6406294Nov 21, 2000Jun 18, 2002Bell Dental Products, LlcSelf contained dental chair with integrated compressor and vacuum pump and methods
US7708344Oct 31, 2008May 4, 2010Midmark CorporationPatient chair with locking assembly
US7914076 *Oct 31, 2008Mar 29, 2011Midmark CorporationDevice with a limit switch and trunnion
US8025336Oct 31, 2008Sep 27, 2011Midmark CorporationDental chair
WO2010051084A1 *Jul 29, 2009May 6, 2010Midmark CorporationDevice with a limit switch and trunnion
Classifications
U.S. Classification297/330, 297/362
International ClassificationA47C1/022, A47C1/024, A61G15/02, A61G15/00
Cooperative ClassificationA47C1/0242, A61G15/02
European ClassificationA47C1/024B, A61G15/02
Legal Events
DateCodeEventDescription
Nov 19, 1991ASAssignment
Owner name: DENTAL-EZ, INC., PENNSYLVANIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST AS OF JANUARY 26, 1990;ASSIGNORS:DOMINION BANK OF MARYLAND, N.A.;JEFFERSON BANK;DOMINION BANK, N.A.;REEL/FRAME:005919/0959;SIGNING DATES FROM 19910429 TO 19911112
Nov 20, 1987ASAssignment
Owner name: DEN-TAL-EZ, INC.
Free format text: SECURITY INTEREST;ASSIGNOR:DEN-TAL-EZ DENTAL PRODUCTS CORP.;REEL/FRAME:004826/0171
Owner name: MERIDIAN BANK, 5 PENN CENTER PLAZA, PHILADELPHIA,
Free format text: SECURITY INTEREST;ASSIGNOR:DEN-TAL-EZ DENTAL PRODUCTS CORP.;REEL/FRAME:004826/0156
Effective date: 19861020
Owner name: MERIDIAN BANK,PENNSYLVANIA
Oct 23, 1986ASAssignment
Owner name: DEN-TAL-EZ DENTAL PRODUCTS CORP., 1900 RITTENHOUSE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SYNTEX (U.S.A.) INC.;REEL/FRAME:004671/0857
Effective date: 19861010
Owner name: DEN-TAL-EZ DENTAL PRODUCTS CORP., A CORP. OF PA.,P
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SYNTEX (U.S.A.) INC.;REEL/FRAME:004671/0857