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Publication numberUSRE7452 E
Publication typeGrant
Publication dateJan 2, 1877
Publication numberUS RE7452 E, US RE7452E, US-E-RE7452, USRE7452 E, USRE7452E
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in dental drills
US RE7452 E
Abstract  available in
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Description  (OCR text may contain errors)


Assignor by mesme assignments t9 SAMUEL S. WHITE.


No. '7.452. Reissued Ja.n z,1e77.




Specification forming part of Letters Patent No. 117,732, dated August 8, 1871 reissue No. 7,4552., dated January 2, 1877; application tiled November 22, 187B.

To. all whom it'mwy concern:

Be it known that I, GREENE V. BLACK, ot'

Jacksonville, in the eounty'of Morgan and xposed of coils wound in opposite directions,

so that as one coil expands under the torsional strain of driving vthe tool, the other will have a tendency to contract.

My invention further consists in combining, with a driving-spring, a hinged yoke, in which the driving-shaft rotates, the two being in the same plane, whereby the joint is allowed to dex while the Ilongitudinal elongation of the shaft is prevented.

My invention further consists in combining, in a dental-engine, a foot-treadle, a tubular standard or support, driving-belts running through said standard, and an arm swinging around said post to support the jointed driving-connections. i

Myinvention further consists in mounting a table or' tray for the reception ot' tools, Sto., upon the top. of the upright post of a dental engine.

In the accompanying drawings, Figure 1 represents a view'in elevation, partly in section, of a machine such as I propose to cm ploy. Figs. 2 and 3 represent detached views of two shafts connected together by a modi fied form of gearing and connecting devices. Figs. 4 to 6, inclusive, show other modilica tions of connecting and driving apparatus.

' A hollow post, A, is secured upon any suitable stand or base, B. A foot-trcadle, D, pivoted on thisbase, is connected by a pitman, d, to the cranks c of a driving-wheel, U, mounted in suitable hearings on Ithe base. A driving-belt, E, passes around the wheel C, and a guide-pulley, F, inside the tubular post A up through said post, and around a pulley, G, on a line-shaft or counter-shaft, H, supported at one end in a cap, I, turning upon the top of the post, and at the other end, in the outer end of a long arm, K, or this arm may, it' preferred, he made in the form of a tube, projecting from the cap and enveloping the shaft, as shown in Fig. 2, at L. A table, M, mounted on the top of the cap I, serves to hold tools, Sto., used in lconnection with the apparatus.

In Fig. 1 the outer end of the shaft H is shown as carrying an india-rubber frictionwheel, N, having a concave side and convex face or periphery, and acting upon a convex wheel, Q, upon the end of a shaft, I?, revolving in bearings in a short tube,`J, connected with the bearing Q on the arm K by means of a tube or collar, J', each collar J J being provided with lugs E It', pivoted together by links S. rIhe shaft Pis connected with ani other shaft,'l, by a short tube, U, toothed yokes V V, links S S', and tube W, the shaft being geared together by wheels N O', similar to those above described. In this case, a coiled spring, X, is arranged between one of the yokes V and the wheel O', also between the tube or stem J and the wheel O, to press the wheels together to cause suiicient friction to impart rotation to the shaft T which carries hurrs or other tools.

The tube W constitutes a handle for guid ing the tool, as usual.

V and pivoted links S s s', to connect the bearings of the shafts, I may employ the links and toothed plates or lears Y Y, Figs. 2 and 3; or, instead of the yokes V V, the shatts may be jointed, as in Figs. f1 and where they arc connected by the yokes Z, and thc adjacent ends of the shafts connected by coiled wires Z', which will allow them to be turned out of a right line. In this latter case, the shafts may be provided with disks or balancer wheels, P', Fig. 5, to steady them in case the coils become bent; but to prevent this unu steadiness, I propose to make said coils double, one within the other, the outer one being coiied in one direction, and the other in the opposite direction, so that the res'stance operating to Instead of using the lugs R It or yokes V coil up the outer one and make it smaller lWills." nnooil the inner one and make it larger. Thus the two will brace each other and prevent the coll twisting upon itself when the resistance is unequal, thereby causing the bit to run steadily, which could not he the case if only a single coil were used. This arrangement ot` the coiled Wire is clearly shown in Fig. 6.

In some cases I may employ toothed wheels n n, Fig. 2, instead ot' the frietion-wheels, the teeth beingl curved across the faces ot' the Wheels to gear properly no matter what angle the shafts may represent, within an angle of ninety degrees, as is well understood.

It will be seen that the shafts P and T may,

besides beingl pointed in any direction, be

swung around the a-Xis of the shaft H by the turning of the tube J' in its bearings Q, to

which tube the joint is eonneeted` K The coiled-Wire connection alsosdmits of pointing the tools in any direction.

Wha-t I claim as ot' my own inventirfiis-f4 1. A driving-spring1 constructed substan` tially as hereinbefore set forth, with its coils wound in opposite directions.

2. The combination, substantially as hereinbetorefs'et forth, of the driving-shaft eom'f posed' of rigid sections united by e. coiled.y

spring, and the jointed yokes in which the shaft-sections have their benrings, the joints of the yokes being in the same plane es the spring, to allow both spring and yoke to flex` without varying the lengthof the shaft.' v

3. The combination, substantially as hereinbet'ore set forth, ot the hollow post, the beltconnections passing therethrough, and a lineshatt mounted upon said post.

4. A tool-tray or table, mounted on the upright post of a dental engine, for the purposes `set forth.

5. Thedental engine hereinbet'ored'escribed, consisting of the combination of a base,` c. tres-die. a. hollow post mounted on said base, belt-connecti ons passing through said post, a turning cap on said post, a shaft mounted on an arm projecting from said cap, and a universal-jointed driving-shaft connected with said arm. y 'I GREENE V. BLACK.'


g A. J. WARD,

Quellen J. Don.