DENTAL CHAIR AND ADJUSTABLE HEAD FIG. 3 is a vertical cross-sectiona! view along section
SUPPORT MECHANISM THEREFOR line 3—3 of FIG. 2 illustrating the adjustment mecha
FIG. 4 is a horizontal cross-sectional view along sec
1. Field of the Invention 5 tion line 4—4 of FIG. 2; and
This invention relates to a dental chair and an im- FIG. 5 is a partial cross-sectional view of the flexible proved adjustment mechanism for the headrest of the wing portion of the chair, chair.
2. Prior Art Relating to the Disclosure Many of the chairs used by dentists and other profes- 10 FIG. 1 illustrates a perspective view of the dental
sionals have adjustable headrest assemblies which are chair of this invention having a lower floor support 10, expensive to fabricate, cumbersome, inadequately ad- a padded lower body support 11 secured to the floor justable and annoying to operate. It is also conventional support 10 and a padded, integral back support 12 for dental chairs to incorporate arm slings extending hinged at 21a to the lower body support forward of the from the top of the back support of the chair to the arm 15 rear terminating edge of the lower body support 11. supports, which keep the patient's arms and hands The frames of the lower body support 11 and back supclose to the body, out of the way of the technician or Port 12 are fabricated from steel plating one-eighth professional. The slings are always slipping loose and inch to five-sixteenths inch thickness over which is needing adjustment. placed padding as an outer decorative upholstery cov
20 ering, such as leather, naugahyde or vinyl. The back SUMMARY OF THE INVENTION support has arm supports 14 attached at each side.
This invention relates to a dental chair incorporating Each of the arm supports includes a rigid steel frame, an adjustable headrest which is vertically adjustable, padding and covering similar to that of the lower body adjustable about a central pivot point and adjustable „c suPPort and back suPPort Dlrectly beh,nd each of *e both forward and rearward. The adjustable headrest 25 arm supports is an arcuate member 15 secured to the comprises a support connecting to the back support of frame of the back suPP°rt' TM >I1"strated by FIG. 1. A the chair at one end and to the adjustment mechanism stlff' sem.-ngid matenal, such as a thick plastic sheet at the opposite end. A padded headrest includes means ,s stretch<?d over \heu arcuate members and between
connecting it with the adjustment mechanism. The ad- ,n the arm suPPorts and the t0P °fthe frameu of th!\bafk justment mechanism includes: (1) an elongated linking 30 ... Pnor to Bering of the entire chair with the „, , • ■ , • f, • outer decorative covering, as illustrated by FIG. 5. The
member having upper and lower, variable size jaw , •, . „ ... ,6' , ,, . 1 t. .
■ • • .. A, end result is a flexible, deflectab e wing portion 16 be
opemngs therein receiving the connecting means of the ., , , . ,' , , ,?*\ . , .
f J u J * ,*>\ • * J- A v side each arm which does not need adjustment and alsupport and the headrest; (2) a pm extending through , „. ■ „ ■ , . . -..
, , ... ', r ° . lows the operator or technician to get closer to the pa
the linking member holding the connecting means in 75 .. . .... *TM. • „■
, ,°,„. °,, - , x b , J3 tient sitting in the chair, if necessary. The wing portions
place; and (3) means secured to the pm at one end con- t-jo.j- Ji <r> i *.u 5 « *■
^ ■ . ' ■ v . . , , ■ , « can be deflected inwardly. On release of the deflection
tacting a camming surface on the linking member for ure ^ wj w.„ ... tQ thejr Qri jna)
contracting the jaw openings about the connecting 5osition due to the stiff material extending from the top means, preventing their movement. of the back su rt over the arcuate tion 15 directl
The invention is also directed to a dental chair m- 40 behind each of the arm s ts 14< xhe rear of the eluding integral, deflectable ^wing portions extending back indudes a s]ot Ig for inseftion of the ad.
between the arm support and the top of the back sup- justable headTest assembly to be discussed, port which (1) are flexile, (2) allow the dentist or The adjustabie headrest assembly is illustrated by technician to work closer to the patient, if desired, and FIGS 2 tnrough 4 and essentiaily comprises a headrest (3) do not need adjustment. 45 support frame 39 covered with a padded front portion
The objects of this invention are: (1) to provide an 40 and a padded rear portion 41 connected by an adimproved adjustment mechanism for the headrest of a justment mechanism to an elongated support plate 19. chair which is relatively inexpensive to manufacture, The headrest assembly is adjusted vertically relative to easy to operate and flush mounted to prevent interfer- the back SUpp0rt by sliding in slot 18. The assembly is ence with the dentist or technician and for design pur- 50 he](J in a desired adjustment position by a friction poses; (2) to provide a dental chair incorporating an ciamp (not shown). The supporting frame 39 of the improved, flush mounted adjustment mechanism for a headrest support has a center cut-out portion, as illusheadrest; (3) to provide a dental chair incorporating trated by FIG. 2, allowing the adjustment mechanism flexible, deflectable wing portions which do not need to be essentially flush mounted within the headrest asadjustment and which allow the operator closer access S5 sembly.
to the patient sitting in the chair; and (4) to provide a The adjustment mechanism comprises essentially an dental chair having a back support hinged to the lower elongated, rectangular linking member 21 having bore body support forward of the terminating edge of the openings 22 and 23 drilled therethrough at the upper lower body support, the back support having a curved, 6Q and lower ends, respectively. Slots 24 and 25, cut in the barrel-like appearance. 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 FIG. 1 is a perspective view of the dental chair of the reduced by compression of the linking member 21. A invention having a cut-away portion illustrating one of 6^ channel 26 is bored at transverse angles through the the flexible wings of the chair; length of the linking member 21 to receive pin 30. The
FIG. 2 is a rear elevational view of the headrest in- channel intersects the bore openings 22 and 23 and eluding the adjustment mechanism; projects a small distance into the bore openings, as il3,858,937