US 500139 A
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3 Sheets-Sheet 1.
R. DE L. KING. DENTAL ENGINE.
No. 500,139. Patented June 27,1893.
ms PETERS 00 morouma, wumxoron, o. c.
(No Model.) 3 Sheets-Sheet 2.
R. DE L. KING.
No. 500,139. Patented June 2'7, 1893.
.A WASNYNGTDN n c (No Model.) 3 Sheets-Sheet 3.
- R. DE L. KING.
DENTAL ENGINE No. 500.139. Patented June 27, 1893.
, Xmmmmx wme UNITED STATES PATENT OFFICE.
ROSWELL DE L. KING, OF NEW YORK, N. Y.
SPECIFICATION forming part of Letters Patent No. 500,139, dated June 27, 1893.
Application filed September 24, 1892. Serial 110.446 .749. (No model.)
To aZZ whom it may concern:
Be it known that I, ROSWELL DE L. KING, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Dental Engines, of whichthe following is a specification.
This invention relates to improvements in dental engines, and has for its object the production of an engine in which the flexible shaft carrying the burr, drill, or other tool, will have an unusuallatitude of movement in a vertical plane, at the same time relieving the operator from sustaining the weight of the shaft, its tube, and driving pulley, thereby permitting perfect freedom in handling the drill and lessening the liability to slipping of the instrument while in contact with a tooth,
- caused by the weight of the above enumerated parts.
The invention further consists in the arrangement and combination of parts making the engine light, strong and durable, and insuring the smooth and even rotation of the flexible shaft in any position it may assume. To these ends my said invention consists in the details of construction and in the combination of parts, as hereinafter more particularly described and pointed out in the claims.
Referring to the accompanying drawings illustrating my invention, in the several figures of which like parts are similarly designated, Figure 1, is a side elevation of the upper part of a'dental engine embodying my invention, and showing the parts in their normal position, or in a state of rest. Fig.2, isa top view thereof. Fig. 3, is a top view showing the engine in use and the flexible shaft and its tube in a horizontal position. Fig. 4, is a similar front elevation. Fig. 5, is an enlarged vertical sectional view of the engine in the position shown in Fig. 1. Fig. 6, is a fragmentary rear elevation, partly in section. Fig. 7, is a detail of the stop device.
It may be stated that the-parts of the engine not particularly shown and described may be of the ordinary and well-known construction. p
a, is a tubular standard having projecting therefrom the adjustable rod 12, which is capable of being turned in the standard a, and which carries near its head the lateral lugs b, to which the opposite belt pulleys c, are
attached, and also having the tubular or oylindrical cross-piece d, through which passes the horizontal arm 6. The rearward portion of the tube (1, is recessed or cut away for about two-thirds of its circumference, as shown at d, Fig. 7, and the arm 6, is provided with the pin or projection e, which,by striking against one side or'the other of said tube 61, limits the rotary motion of said arm. The forward portion of arm'e, is provided with a coil spring f, havinga seat at one end against the tube d, and at the other end against the head of the arm. From the head of said arm 6, extend the V-shaped projections g, at the outer ends of which are the tubular bearings g, g, through which the usual flexible shaft :0, passes. h, is a belt wheel or pulley secured to the flexible shaft or, between the tubular bearings g, g", the axis of said pulley being hollow and surrounding said shaft, to which the pulley is secured .by the screws h, passing through the tapped lugs 71 on either side of said pulley and impinging against the shaft, (see Fig. 5,) which is contained for the greater part of its length in the usual tube 2, having the ordinary metal termination y, of a size to surround and fit the lower tubular bearing g, making what is known as a slip-joint, and to aid the operator in forming this connection and to prevent his hand-from slipping on the smooth metal, I provide the metal portion y,'with the elliptical projections y.
i, is a tube terminating in a heavy counterbalance t", which is also preferably bored to permit the shaft to extend up into it, as shown in Fig. 5. By this means an unusual length of shaft may be used, the extra length being utilized in case of breakage.
The rearward portion of arm e, is screwthreaded and has loosely screwed thereon the counterbalancej, having depending therefrom the coiled spring is, which is adjustably secured to the standard a, by the strip (Z, and set screw m.
The operation of my device is as follows z- Motion is communicated to the belt n, from any suitable source of power, as by a treadle and fly-wheel, or an electric or a water motor, 850., and the said belt passes over pulleys e,
and around pulley h, thereby giving a'rotary continuous movement.
motion to the shaft w. When the operator raises the free end of the tube 5,, from its normal position shown in Fig. 1', the counterbalance 1'', is thrown to a horizontal position, as shown in Figs. 3, 4, and 6, and is stopped by the pin e, on the arm e, coming in contact with one side or the otherof thetubular.
cross-piece cl. By means of this counterbalance the operator has but little weight to hold, and is not obliged to sustain the-long'shaft, its tube and driving pulley against the attraction of gravity, as is now the case. The engine-may be left in one position and the operator work with equal facility'on either side of the patient, the counterbalance i, sustainingthe weight of the shaft-,tubeand driving pull'ey,,andthe extreme positions of said counterbalance are shown'by full anddotted lines'inFig. 6. Any inequalities in the belt, caused by splicing, &c., are compensated for by the spring f, which allows the arm e, carryin g the operating parts a reciprocating motion, and the burr,'drill, or other instrument fastsued to the shaft,,is thus given a steady and When the operator uses. the instrument at an angle. in a horizontal plane tothe engine, the red I), isrotatedinr 5 its tubular standard, a, against the tensionofi the spring 7;, twisting said spring to one side on the other, as shown in Fig.2, and as soon-as the operator releases the instrument, said spring is, resumesits normal position, as inFig. 1,.the screw connection between arm e, and the balancej, being loose to permit perfect freedom of movement between the said parts, relatively to each: other, The weight j, and, spring k,
whichis normally at. a slight tension, tends to counterbalance the weightof the forward! portion, of arm e, and, the annexed parts, while, as before stated,the counterbalance '5', relieves theweight, of the tube z,.shaftm, and,
driving pulley; it, but. is notquite equal to the combined Weightof said, parts, so that when the operator drops the tube z, it willovercome the weight '5", and at once assume the pet-pens 4, dieular position shown'in Fig. 1.
Whatl claim as new,.and desire to secure by Letters Patent, is- 1. In a dental engine, a swiveled upright support having a bearing for a horizontal arm, a l-rotatable arm extending through said .ard, substantially as described for the purposes set forth.
3-. In a dentaltengitne, a tubular standard, 1 an adjn stable rotatable rod. therein, carrying opposite upwardly inclined llugs andt a,tnbullar cross or IT-head; guide. pulleys on: said lugs, and a. horizontal arm passing; through I the T-head and. having atits trout. end, bearin gs for the, toolashaft; a-ishatt passing through I said bearings, anda belt wheelmounted upon ,the shaft between thabeanings substantially v ,as described.
t. Ina dental engine,,a, tubular. standard, Za rotatable rod,therein, provided with a. tubular crossv head, having a portionofi itscincu-m- @ference cut away in combination with a horilzontal arm; mounted, in: said crosshead, and
: having azipin orproj ectiontworking in said .Jcut away portion. whereby themotion of. the ,said armis limited, substantiallyeasidescribed;
,bearingfor a horizontal arm, a rotatable arm mounted in said bearingandi carrying at one fend tubular. bearings for a tool shaft; a.tool ,Q shaft mountedin, saidbearings, and carrying i3, beltwhee], in combinatiom witha. weight For counterbalancehavinga tubular. extension (adapted to be passed over onset thebearjings of the shaft,substantially asdeseribed ,for thepnrposes set forth,
SignedatNew York, in thetcounty of New j; York and State of New York, this 23d day: of
,Septemben, A, D. 1892., t
' ROSWELL DE L. KIN-G;
J. B. SABINE,,
EUGENE V. MYERS.
5. In a dental engine, a support having. a,