Specification of George Fellows Harrington : apparatus for drilling, cutting and polishing teeth.

  • Harrington, George Fellows.
Date:
1864
Catalogue details

Licence: Public Domain Mark

Credit: Specification of George Fellows Harrington : apparatus for drilling, cutting and polishing teeth. Source: Wellcome Collection.

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    Harringtons Invpts. in Apparatus for Drilling, Cutting, and Polishing Tooth, rotatory motion to tools intended to operate upon teeth whilst in the mouth. The revolutions of the tools are arrested or controlled by the pressure of the thumb or finger, or of a break lever against a break wheel, which is fitted on to the arbour or spindle of one of the train of wheels forming the clockwork, whereby more or less friction or resistance will be obtained, thereby regulating 5 or controlling the speed of revolution of the tools, or stopping the same when not required for use. And in order that my said Invention may be fully understood, I shall now proceed more particularly to describe the same, and for that purpose I shall refer to the several Figures on the Sheet of Drawings hereunto annexed, 10 the same letters of reference indicating corresponding parts throughout all the Figures. Fig. 1 of my Drawings is a full-sized elevation of my apparatus showing the mode of using the same ; Fig. 2 is a front elevation of the same; Fig. 3 is a similar view with the cap removed, to show the train of gearing; Fig. 4 15 is a side view corresponding to Fig. 1; Fig. 5 is a longitudinal vertical section of the spring box and first driving wheel; Fig. 6 is a front view of the same with the top plate removed ; and Figs. 7 and 8 are enlarged details, which I shall herein-after more fully refer to. A is a hollow metal spring box, within which is fitted a barrel spring B, the 20 inner end of such spring being connected to the axis C of a ratchet wheel D, such axis turning freely in the large toothed driving wheel E; F is a spring pall or detent secured to the face of the wheel E, and taking into the teeth of the ratchet wheel, so that on the axis C being rotated by the barrel spring a rotatory motion will be imparted to the toothed wheel E through the ratchet 25 wheel and pall F ; G is a square shank on the end of the axis C, by which the spring B may be wound up; H is a plate or cover, which is screwed on to the spring box A, and conceals the main wheel E and its attachments. Through an opening in this plate or cover passes the small pinion I fast on the axis of the toothed wheel K, which wheel gears into another pinion L 30 fast on the axis of the toothed wheel M, and this latter wheel gears into a third pinion N fast on the axis of the friction or break wheel 0; the several wheels and pinions K, L, M, N, and 0 are concealed by a cap or cover P, which is attached by screws or otherwise to the plate or cover H; Q is a tube or sheath, which is screwed at one end into a boss R formed upon the cap P. S5 Within this tube is placed the spindle S, provided with a pivot or journal at its inner end, and having formed or fitted thereon a small pinion T, which when the tube and spindle are adjusted gears into the teeth of the spur wheel K, and consequently receives a rapid rotatory motion therefrom. A