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Patente

  1. Erweiterte Patentsuche
VeröffentlichungsnummerUS3858937 A
PublikationstypErteilung
Veröffentlichungsdatum7. Jan. 1975
Eingetragen18. Mai 1973
Prioritätsdatum18. Mai 1973
Auch veröffentlicht unterUSRE29811
VeröffentlichungsnummerUS 3858937 A, US 3858937A, US-A-3858937, US3858937 A, US3858937A
ErfinderNorris Floyd E
Ursprünglich BevollmächtigterArnold S Auto Upholstery Inc
Zitat exportierenBiBTeX, EndNote, RefMan
Externe Links: USPTO, USPTO-Zuordnung, Espacenet
Dental chair and adjustable head support mechanism therefor
US 3858937 A
Zusammenfassung
A dental chair is disclosed which has an adjustable headrest incorporating a flush mounted adjustment mechanism allowing (1) adjustment about a central pivot, (2) vertical adjustment or (3) forward and rear adjustment. The dental chair also incorporates deflectable "wing" portions adjacent each of the arm supports which do not need adjustment and which allow the dentist more ready access to the patient.
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lltte States Patent 1191 [111 3,85,37 Norris Jan. 7, 1975 [54] DENTAL CHAIR AND ADJUSTABLE HEAD 3,627,379 12/1971 Faust 297/391 P O T MECHANISM THEREFOR 3,719,388 3/1973 Fortnan 297/410 3.729127 4/1973 Ohta 297/391 {75] Inventor: Floyd E. Norris, Rcnton, Wash. [73] Assignee: Arnolds Auto Upholstery, lnc., Primary ExaminerCasmir A. Nunberg Seattle, Wash. Attorney, Agent, or Firm-Seed, Berry, Vernon & 1221 Filed: May 18, 1973 Baynham [21] Appl. No.: 361,591 [57] ABSTRACT A dental chair is disclosed which has an adjustable [52] 11.8. C1 297/408, 297/284, 229971742616 headrest incorporating a flush mounted adjustment mechanism allowing (1) adjustment about a central ;?l;:.ldC(l).f...S..E.l.n/:\h47C 1/l5 /)$f 3 ;?/%%7? Z45 pivot, (2) vertical adjustment or (3) forward and rear 5 421 adjustment. The dental chair also incorporates deflectable wing portions adjacent each of the arm supports which do not need adjustment and which allow [56] UNITE ;;T r ;S gZqrENTS the dentist more ready access to the patient.

3,603,642 7/1971 Laessker 297/408 4 Claims 5 Drawing Figures BACKGROUND OF THE INVENTION l. Field of the Invention This invention relates to a dental chair and an improved adjustment mechanism for the headrest of the chair.

2. Prior Art Relating to the Disclosure Many of the chairs used by dentists and other professionals have adjustable headrest assemblies which are expensive to fabricate, cumbersome, inadequately adjustable and annoying to operate. It is also conventional for dental chairs to incorporate arm slings extending from the top of the back support of the chair to the arm supports, which keep the patients arms and hands close to the body, out of the way of the technician or professional. The slings are always slipping loose and needing adjustment.

SUMMARY OF THE INVENTION This invention relates to a dental chair incorporating an adjustable headrest which is vertically adjustable, adjustable about a central pivot point and adjustable both forward and rearward. The adjustable headrest comprises a support connecting to the back support of the chair at one end and to the adjustment mechanism at the opposite end. A padded headrest includes means connecting it with the adjustment mechanism. The adjustment mechanism includes: (1) an elongated linking member having upper and lower, variable size jaw openings therein receiving the connecting means of the support and the headrest; (2) a pin extending through the linking member holding the connecting means in place; and (3.) means secured to the pin at one end contacting a camming surface on the linking member for contracting the jaw openings about the connecting means, preventing their movement.

The invention is also directed to a dental chair including integral, deflectable wing portions extending between the arm support and the top of the back support which (I) are flexible, (2) allow the dentist or technician to work closer to the patient, if desired, and (3) do not need adjustment.

The objects of this invention are: (1) to provide an improved adjustment mechanism for the headrest of a chair which is relatively inexpensive to manufacture, easy to operate and flush mounted to prevent interference with the dentist or technician and for design purposes; (2) to provide a dental chair incorporating an improved, flush mounted adjustment mechanism for a headrest; (3) to provide a dental chair incorporating flexible, deflectable wing portions which do not need adjustment and which allow the operator closer access to the patient sitting in the chair; and (4) to provide a dental chair having a back support hinged to the lower body support forward of the terminating edge of the lower body support, the back support having a curved, barrel-like appearance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view of the dental chair of the invention having a cut-away portion illustrating one of the flexible wings of the chair;

FIG. 2 is a rear elevational view of the headrest including the adjustment mechanism;

FIG. 3 is a vertical cross-sectional view along section line 3-3 of FIG. 2 illustrating the adjustment mechamsm;

FIG. 4 is a horizontal cross-sectional view along section line 44 of FIG. 2; and

FIG. 5 is a partial cross-sectional view of the flexible wing portion of the chair.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 illustrates a perspective view of the dental chair of this invention having a lower floor support 10, a padded lower body support ll secured to the floor support and a padded, integral back support 12 hinged at 21a to the lower body support forward of the rear terminating edge of the lower body support II. The frames of the lower body support Ill and back support 12 are fabricated from steel plating one-eighth inch to five-sixteenths inch thickness over which is placed padding as an outer decorative upholstery cov-- ering, such as leather, naugahyde or vinyl. The back support has arm supportsl ll attached at each side. Each of the arm supports includes a rigid steel frame, padding and covering similar to that of the lower body support and back support. Directly behind each of the arm supports is an arcuate member 15 secured to the frame of the back support, as illustrated by FIG. l. A stiff, semi-rigid material, such as a thick plastic sheet 17, is stretched over the arcuate members and between the arm supports and the'top of the frame of the back support prior ,to covering'of the entire chair with the outer decorativecovering, as illustrated by FIG. 5. The.

' end result is a flexible, deflectable wing portion 16 be side each arm whichdo'es not need adjustment and allows the operator ortechnician to get closer to the patient sitting in the chair, if necessary. The wing portions can be deflected inwardly. On release of the deflection pressure, the wing portions will return to their original position due to the stiff material extending from the top of the back support over the arcuate portion 15 directly behind each of the arm supports 14. The rear of the back support includes a slot 18 for insertion of the ad justable headrest assembly to be discussed.

The adjustable headrest assembly is illustrated by FIGS. 2 through 4 and essentially comprises a headrest support frame 39 covered with'a padded front portion 40 and a padded rear portion 41 connected by an adjustment mechanism to an elongated support plate 19. The headrest assembly is adjusted vertically relative to the back support by sliding in slot 18. The assembly is held in a desired adjustment position by a friction clamp (not shown). The supporting frame 39 of the headrest support has a center cut-out portion, as illustrated by FIG. 2, allowing the adjustment mechanism to be essentially flush mounted within the headrest assembly.

The adjustment mechanism comprises essentially an elongated, rectangular linking member 2E having bore openings 22 and 23 drilled therethrough at the upper and lower ends, respectively. Slots 24 and 25, cut in the linkmember 21, as illustrated by FIG. 3, communicate with the bore openings 22 and 23. The slots allow the internal diameter of the bore openings 22 and 23 to be reduced by compression of the linking member 21.. A channel 26 is bored at transverse angles through the length of the linking member 21 to receive pin 30. The channel intersects the bore openings 22 and 23 and projects a small distance into the bore openings, as illustrated by FIG. 4. The bore openings 22 and 23 are fitted with pins 27 and 28, having an outer diameter slightly less than the internal diameter of the openings 22 and 23, so that they are free to rotate in the absence of compressive force on the elongated linking member 21, tending to reduce the internal diameter of the bore openings 22 and 23. Pin 27 consists essentially of two separate arcuate segments held in spaced relation by a rod 36 having a width less than the diameter of the pin 27. The rod 36 is secured to the segments by a pivot pin 37 extending through the rod, as illustrated by FIGS. 3 and 4. The pivot pin allows the rod to pivot thereabout between the positions shown in phantom in FIG. 4. The rod 36 is connected by collars 38 to the headrest support frame 39. The headrest can thus be pivoted about the pivot pin 37 to a desired position and locked in place, as will be described.

The lower pin 28 extends beyond the plane of the member 21 on each side and includes a slot extending part way therethrough which receives the forks 42 of support plate 19, as illustrated by FIG. 2. The pin 28 is secured in place to the plate 19 by bolts 43.

Each of the pins 27 and 28 has a central channel 29 cut therein, as illustrated by FIG. 4, of a depth sufficient to allow pin 30 to be inserted through the channel 26. The purpose of the channels 29, in cooperation with pin 30, is to secure the pins 27 and 28 in place in the linking member. I

The pin 30, extending through channel 26 and securing the pins 27 and 28 in place, has a threaded portion 31 on the lower end over which is fitted a nut 32. The nut bears against a shoulder cut in the lower end of the linking member 21. The upper end of the pin is pivotally connected to a cam member 34 hearing against a cam surface 33 cut in the upper end of linking member 21. The cam member 34 includes an integral handle 35 movable between the positions illustrated by FIG. 3. In the position shown in solid lines in FIG. 3, the pin in cooperation with the cam'surface 34 exerts a compressive force on the respective ends of the linking member 21 compressing and closing the slots 24 and 25. As a result the internal diameter of openings 22 and 23 is reduced so that each frictionally engages the outer surfaces of pins 27 and 28 and prevents their rotation. When the handle 35 is moved to the position shown in phantom in FIG. 3, the compressive force on the linking member 21 is released, allowing the pins 27 and 28 to rotate freely within the bore openings 22 and 23.

The headrest portion of the adjustable headrest assembly can easily be adjusted relative to support plate 19 by moving the handle 35 to the position shown in phantom in FIG. 3 and rotating the headrest about either of the upper or lower pins 27 and 28 and pivoting the headrest about pivot pin 37 as desired. Once the desired position of the headrest is obtained, the operator presses the handle 35 down to the position shown in solid lines in FIG. 3 to lock all the components together and prevent further rotation or movement. The headrest can be adjusted to any desired position very easily and quickly. The adjustment mechanism is flush mounted within the headrest assembly, is simple to operate and is relatively inexpensive to fabricate. The dentist or technician can adjust the patients head to any desired angle for mouth work or denture work very easily and without complication.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. An adjustment mechanism linking a head support and means for attachment to the back support of a chair comprising:

an elongated linking member having two parallel annular openings extending therethrough near each end,

slots in the linking member extending from the outer surface thereof into communication with each of the annular openings, each of the slots allowing the internal diameter of each of the annular openings to be reduced by compression of the linking member adjacent the slots;

an open-ended channel extending through the linking member essentially transverse to the axis of each of the annular openings and communicating with the slots and a segment of each of the annular openings;

annular pins received in each of the annular openings, each pin having an external diameter slightly less than the internal diameter of the respective annular opening in the uncompressed state, allowing free rotation thereof, each pin having a channel extending around the outer circumference thereof;

means connecting one of the annular pins to the head support and the other annular pin to the means for attachment to the back support;

a pin extending through the open-ended channel of the linking member communicating with the respective channels in the annular pins to retain the annular pins in place in the linking member;

retaining means at one end of the pin to retain the pin in place in the open-ended channel; and

cam means connected to the opposite end of the pin for exerting tension on the pin relative to the linking member to compress the linking member, reducing the diameter of the annular openings and frictionally engaging the annular pins to lock them against rotation.

2. The mechanism of claim 1 wherein the annular pin connected to the head support comprises two unconnected arcuate segments and wherein the means connecting the annular pin to the head support is a rod having a width less than the diameter of the annular pin extending between the two segments, the rod pivotally connected to the segments midway between their ends for adjustment of the headrest about the pivotal connection.

3. In a dental chair having a floor support, padded lower body support, arm .supports, head support and adjustable back support, the improvement comprising providing flexible wing portions extending from the upper terminating edge of the back support down each side to a point adjacent the rear of each of the arm'supports, allowing a dentist or technician closer access to the patient sitting in the chair by deflection of the wing portions and providing an adjustment mechanism for the head support, the mechanism comprising:

an elongated linking member having two parallel annular openings extending therethrough near each end,

slots in the linking member extending from the outer surface thereof into communication with each of the annular openings, each of the slots allowing the internal diameter of each of the annular openings to be reduced by compression of the linking member adjacent the slots;

an open-ended channel extending through the linking member essentially transverse to the axis of each of the annular openings and communicating with the slots and a segment of each of the annular openings;

annular pins received in each of the annular openings, each pin having an external diameter slightly less than the internal diameter of the respective annular opening in the uncompressed state, allowing free rotation thereof, each pin having a channel extending around the outer circumference thereof;

means connecting one of the annular pins to the head support and the other annular pin to the means for attachment to the back support;

a pin extending through the open-ended channel of the linking member communicating with the respective channels in the annular pins to retain the annular pins in place in the linking member; retaining means at one end of the pin to retain the pin in place in the open-ended channel; and cam means connected to the opposite end of the pin for exerting tension on the pin relative to the linking member to compress the linking member, reducing the diameter of the annular openings and frictionally engaging the annular pins to lock them

Patentzitate
Zitiertes PatentEingetragen Veröffentlichungsdatum Antragsteller Titel
US3603642 *13. Okt. 19697. Sept. 1971Sybron CorpArticulated headrest for dental chairs and the like
US3627379 *10. März 196914. Dez. 1971Recaro AgBackrest for a seat especially of a motor vehicle
US3719388 *12. Mai 19716. März 1973Den Tal Ez Mfg CoAdjustable headrest assembly for a dental chair
US3729227 *11. Juni 197124. Apr. 1973S OhtaDental chair
Referenziert von
Zitiert von PatentEingetragen Veröffentlichungsdatum Antragsteller Titel
US3924894 *7. Okt. 19749. Dez. 1975Sybron CorpDental chair backrest with integral elbow supports
US4300249 *25. März 198017. Nov. 1981Taylor Francis HChair for neurologically impaired patients
US4466662 *12. Nov. 198121. Aug. 1984The United States Of America As Represented By The Secretary Of The Air ForcePowered articulated headrest system
US4674792 *5. Juni 198623. Juni 1987Ikeda Bussan Co, Ltd.Position adjustable see-through headrest
US5177823 *13. Mai 199212. Jan. 1993Oakworks, Inc.Adjustable headrest
US5427436 *26. Mai 199427. Juni 1995Lloyd; John T.Adjustable headrest
US5564668 *15. Febr. 199515. Okt. 1996Crowe, Ii; Marvin E.Computer stand for vehicles
US6249923 *6. Aug. 199926. Juni 2001Hill-Rom, Inc.Adjustable head rest for a patient support
US631459714. Febr. 200113. Nov. 2001Hill-Rom Services, Inc.Stretcher foot pedal
US639741421. Juni 20004. Juni 2002John T. LloydAdjustable face rest
US657821529. Sept. 200017. Juni 2003Hill-Rom Services, Inc.Surgery stretcher
US668142631. Jan. 200327. Jan. 2004Hill-Rom Services, Inc.Mattress for surgery stretcher
US67185806. Febr. 200313. Apr. 2004Hill-Rom Services, Inc.Stretcher having pivotable and lockable patient support sections
DE3902725A1 *31. Jan. 198924. Aug. 1989Lebenshilfe Fuer Geistig BehinTreatment couch, especially massage couch
Klassifizierungen
US-Klassifikation297/408, 297/284.9, 297/411.46
Internationale KlassifikationA61G15/12, A47C7/38, A61G15/00, A47C7/36
UnternehmensklassifikationA61G15/125, A47C7/38
Europäische KlassifikationA61G15/12B, A47C7/38