Improved bead-rest for dentists and barbers chairs
US 93662 A
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f metallic plate,
"tutii gisten -gatrnil (dimite- A -I-/etters Patent No; 93,662, datedvAugast 17, 1869.
IMPnovnn HEAD-REST ron DnN'rIs'rs' AND Bananas' camas.
The Schedule referred in these Letters Patent and making part et' the same.
'To all whom it may concern:
Be it known that I, ROBERT W. ARCHER, ofthe city of Rochester, in the4 county of Monroe, and State of New York, have invented a certain new anduseful Improvement in Head-Rests for. Dental and Barbers Ghairs; and I do hereby declare that the following is a full aud 'exact description thereof, reference being had to the accompanying drawings, making part of thisl specification, in whichv Figure'l is a sectional view of my improved headrest as applied toa dental chair.
Figure 2, a top view of the bearing of the standard.
Figure 3, a bottom 'view of the head-rest, detached.
Figure 4, a perspectivevvie'w of the clamping-screw, inverted. d
Like letters of reference indicatecorresponding parts.
in all the figures.
My invention consists .in the arrangement of the parts for producing the necessary horizontal and vertical adjustment ot' the head-rest, as hereinafterqdescribed.
In the drawings- A indicates the head-rest proper, and
B, the standard-bearing on which it rests l the said bearing sliding up and down in the batik of the chair,
, On the under side of the head-rest' is secured a C, having three slots, a a a, two running crosswise and the other longitudinally, and all connecting, as shown. v
At one end ofone slot is made an enlarged-opening, l1, to allow the head c of the clamping-screw D to pass. .y j
The head of this screw being of larger diameter than the slots, it holds on top when clamped down by the nut E, which screws on shank d' beneath.
The bearing' B has also a longitudinal slot, f, through which screw I) passes; and in this slot rests a square cross-arm, g, -of ythe screw, which prevents it from turning as the clamping-nut is tuiined.
- 0n top of thelbearing'B are placed two rubber or equivaient strips, 'i i.
The employment oi the slots a a a, allows any desired degree or kind of horizontal adjustment bysimply loosening the clamping-nut. g The head-rest can be adjusted clear to one side, or
to any angle desired, and tightened again by turning,
A special advantage is secured by the employment I of the cross-arm g and the packing-'strips i. fi.
The'cross-arm prevents the turning of the screw d when the nut is turned, so that the adjustment of the HOn-o-n-I f with the use of 4head-rest above may be .accomplished both hands, if desired.'
The cross-arm lrruowlse interferesv with the sliding ofthe screw B in the slots a a a.
f The packing-strips not onlyvprevent noise in the adjustment of the head-rest, but they specially serve ,to retain the head-rest from slipping when once adjusted, and with but a slight pressure of the clamp,- ing-nut.
This is of much importance, as thereby the headrest is firmly held, and no undue strain comes upon the screw. v A.
l The vertical adjustment of the head-rest is produced as follows:
A fixed turning-screw, G, is having a crank-head, k, outside, by which it is turned. On this is situated a loose nut, l, having pivoted thereto a forked connecting-arm, m, jointed at the opposite end of the upperieaf of the head-rest.
As the vscrew is turned in one direction or the other,the top of the'headfrest will be correspondingly raised or depressed as'it moves around the hinge. l This arrangement for producing the vertical adjustment of the head-rest has special relation to that before described, for producing the horizontal adjustl -ment, since there` is no projection of either part through the`bed of other.
the device to interfere withthe a curved ratchetbar has been generally :used to produce the vertical adjustment-projecting down through the bed andoperated from beneath.
Such ya device cbuld not be used in my head-rest, as it would interfere with the lower adjustment, and, in fact, prevent its use altogether.
What I claim as my invention, and desire to secure by Letters Patent, is-
.1. 'The arrangement, with the bearing B and slotted plate O, as described, of the packing-strips 't 'i and screw D, provided with the cross-arm g and head c, f/
the .whole operating in-the manner and for the purpose speeiiied.
2. In combination with the above, the arrangement of the screw G, nut l, and connecting-arm m, for pro-` ducing the lvertical adjustment, substantially as de-4 scribed.
' In witness whereof, I have hereunto signed my name, in the Vpresence of two, subscribing witnesses.
. i ROBERT W. ARCHER.
Witnesses R. F. Oscoop, Gao. W. Mrn'r'r.
located in the bed, v