US171539A - Improvement in head-rests for dental chairs - Google Patents

Description

U NI'IED STATES PATENT OFFICE...

ELI T STARK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 SAMUEL S.

WHITE, OF SAME PLAGE.

lMP-ROVEMENT IN HEAD-RESTS FOR DENTAL CHAIRS.

Speeificat1on i'orming art 0f Letters Patent N0. l71539, dated December 28, 1875; application filed November 5, 1875.

OASE B.

T0 all whom it mag; concern:

Be it known that I, ELI T. STARK, of Philadelphia, Pennsylvania, have invented'certain new and useful Improvements in Head-Rests for Dentists and other Ohairs, of which the following is a specification:

My invention relates to head-re'sts 0f that dass capable 0f adjustment vertically, laterally, and longitudinally relatively to the 0hair. Its objeet is t0 give even a wider range of adjustment t0 the head-rest than has heretofore been praeticable, whieh end I attain by se0uring; the supporting-bar 011 0ne side of the can- -tral lii1e 0f the head-restand mounting it in a turning-pst, in which it freely slides and turns when released fr0m its clamp-screw, whereby the position 0f the head-rest may be reversed.

The subject-matter claimed is hereinafter specified.

In the accompan5ing drawings, Figure 1 represents a view, in perspective, 0f myin1- proved apparatus w1th the head-rest elevated; and Fig. 2, a vertical longitudinal central section therethrough, on an enlarged scale, showin g the head-rest as depressed. The head-rest A, 0f approved construction, has seeured 130 it 011 one side of its central longitudinal lin0, by means 0f suitable braukets b b, a rod, B, capable 0f 1noving freely endwise and ot' turning in its socket 0r bearing in a sectional adjusting frame 0r holder, O C, in turn capable of turning and sliding-upon tl1e usual supporting-bar E, vertically adjustable upon the back 0f the ehair by well-known n1eans. This adjusting-frame is hold by the usual dampscrew D.

I will now proeeed t0 deseribe the distinguishing characteristio 0f my invention. The l0wer portion, O, 0f the holder is provided With a hearing-shoe, c, acted up0n by the clamp-serew, and,in turn, bearing uponthe supporting-bar E. Another shoe, c, rests up- 011 the upper side 0f the support E and extends into the upper section 0 far enough to bear against another shoe, c, up0n which the supporting-rod B rests. 'Ihe upper section, O, 0f tlie ad jnsting-frame which I eall a turning-post, is secured 130 the lower one by means 0f an annular fiange, F, screwing upon the lower section anti overlapping a shoulder 0n the t urning-post, said ring being held in piace by a check-screw, f.

By this mode 0f construetion the turningp0st is capable 0f turning freely in the lower portion, O, 0fthe adj usting-frame, which gives the capacity of varying the angle 0f the h'eadrest horizontallyrelatively to th0 chair, even 130 the extent 0f reversing it entireiyand by then swinging the head-rest 0ver by roeking it in its bearings it may be adjusted vertically t0 any desired position. It may also be moved laterally by sliding it endwise in the turningpost, and the latter may be adjusted back ward 0r forward, 0r at any desired angle, by sliding 0r turning the adjusting-frame 0n its snpportin g-bar, and all the parts may be firmly clamped in nny desired position by tightening the single clan1p-screm The operation 0f my invention and its advantages will readily be understood fr0u1 the foregoing description.

I claim as my invention l. A head-rest mounted. upon a supportingbar, secured upon 0ne side 0f its longitudinal eenter and rocking in a turning-post, whereby the head-rest is rendered reversible and a wide range 0f motion imparted 130 it, substantialiy as set f0rth.

2. The sectional adjusting-frame hereinbefore described, consisting 0f a low er seotion, a turning-post mounted thereon, and a clampscrew, these members being' constructed and operatingin eombination, substantially as hereinbefore sei; forth.

In testimony whereof I have hereunto subseribed my name.

ELI T. S'IAER.

Witnesses:

FRANK L. BIS E, J. B. WILLIAMS.

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