US561561A - Dental engine - Google Patents

Description

(No Model.) I 2 Sheets-Sheet 1,

B. s. BROWN. .DENTAL ENGINE.

No. 561,561. Patented June 9, 1896.

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B. S. BROWN. DENTAL ENGINE.

Patented June 9, 1896.

witnesses. Invenior.

UNITED STATES f ATENT Urricn.

BENONI S. BROWN, OF ONSET, MASSACHUSETTS.

DENTAL ENGINE.

SPECIFICATION forming part a Letters Patent No. 561,561, dated June 9, 1896. Application filed November 1, 1894. Serial No. 527,634. (No model.)

To aZZ whom it may concern:

Be it known that I, BENONI S. BROWN, residing at Onset, in the county of Plymouth and State of Massachusetts, have invented an Improved Dental Engine, of which the following is a specification.

Like letters and figures represent corresponding parts in the drawings.

My invention has for its Object, chiefly, to provide a dental engine whose principal and bulky parts are placed out of the way of the operator and adapted to have the desired parts swung into position for use.

A bracket attached to the wall or standard supports a horizontally-swinging frame hinged thereto. A vertically-rotating drivin g-wheel and a vertically-swinging and counterbalanced extension-arm are pivoted to said frame, the extension-arm being adapted to hold a frame carrying a rotatable spindle to which is attached a flexible shaft operatively connected to a dental handpiece, or a frame in which revolve the guide pulleys for carrying the belt or cord from which is suspended and operatively connected a dental handpiece for like purpose. The driving-wheel may be operated by a crank and pitman or, preferably, by a wrist connection pivoted on a wrist-pin, which can be attached to one of the arms of the wheel and be connected bya vertically-acting rod or chain to a crank at tached to a horizontal rock-shaft, which can pass under the'chair and is actuated by a treadle.

Figure 1 represents a general elevation of the entire engine as seen from in front of the chair and looking toward it, and is intended to show the rock-shaft and crankat or about the center of their paths of oscillation; Fig. 2, a View of the supporting-arm and counterweight; Fig. 3, enlarged detail'of the end of the supporting-arm and the spindle, to which may be attached a flexible driving shaft; Fig. 4, enlarged detail of end of supportingarin, showing the guide-pulleys of a suspension-handpiece; Figs. 5 and 6, enlarged detail of actuating-crank; Fig. 7, enlarged detail of treadle-crank; Fig. 8, top elevation of the frame, bracket, wheel, supporting-arm,

and spindle; Fig. 9, end View of driving-wheel and its frame, showing the latter in section,

7 Fig. 10, front View of bracket; Fig. 11, top View of rock-shaft, universal joint, and treadle; Fig. 12, side View of treadle, its frame, and treadle-crank and pitman; Fig. 13, a section of the solid part F of the rock-shaft in perspective, showing channel or groove. Fig. 14 shows a section in perspective of the tubular part F of the rock-shaft with spline or feather inside. Fig. 15 is a front View of the universal joint with a section of the rockshaft. Fig. 16 is a side View of the same, showing the bracket in section. Fig. 17 shows the telescoping joint of the rocking shaft with hollow part in section and solid part partly in section. Fig. 18 is a sectional View of the joint between the hollow part of the rockshaft and the solid section L, showing the collar on the latter; Fig.19,ele vation of chain; Fig. 20, elevation of connecting-rod 9. Fig. 21 shows a modified form of actuating-crank. Fig. 22 shows the pins in. section.

A is the bracket supporting the engineframe B. It has suitable holes through it which receive screws for attaching it to a wall, a door, or window-frame, a strip of wood Q, attached to the wall, or it can be secured to an independent upright secured to the floor at its base. The bracket has lugs 6 6, provided with holes to receive the pins T T.

The frame 13 can be stationary or can be hinged to the bracket A in any well-known manner, so as to swing horizontally, as shown, and has lugs t t, with holes to receive the pins T Tfor that purpose. Alon g pin 0 is inserted into the frame near its top, and over this pin is hooked one end of the off-center spring S.

The driving-wheel G can be pivoted tothe frame Bin any suitable way. It is here shown pivoted to one side by a pin a, passing through its center and through a boss on the frame B. The end of this pin can be threaded to receive a nut.

The wrist connection 1) is pivotally mounted on the wrist-pin or screw 2, which in the form here shown is inserted in one of the arms of the wheel C. The wrist connection has two eyes or hooks a and (I inserted in its periphery.

The spring S is for the purpose of keeping the wheel 0 off from the dead-center, and

taken through the dotted line 2 .2, Fig. 8'

so that it can be readily started. It has hooks at each end which engage, respectively, with the pin 0 and with the hook or eye a.

The connecting-rod g has hooks at each end, and these hooks engage with short chains 7' 4' attached, respectively, to the hook (Z on the wrist connection and to the hook at on the pitman N of the actuating-crank M or to its modification V. A single long chain instead of the rod and two short chains can be used with good effect and is simpler. The object of the chains 7' r is to give the rod great freedom of motion, and thus prevent any strain or binding when the rod g is out of the plane of rotation of the wheel 0.

The supporting-arm G G G can be counterbalanced by a weight or by springs in any well-known way. It is telescopic and is pivoted to the frame B opposite the wheel Cand in line with the axis thereof, so that when it swings vertically the length of the drivingcord 0, which connects the drive wheel 0 with the spindle 0 will not be affected. The section G of the arm is secured to the frame B by the pin to, passing through it, and is held by a washer q and a nut w, screwed to the pin a, not tootight to preventits free motion, and it is made preferably solid, curves toward the wheel, and then in line with it, and terminates in a cylindrical end 3, which fits snugly into the rear of the part G. The section G is tubular, split at its forward end, which has ears or lugs through which a thumbscrew m passes for the purpose of tightening it upon the section G which slides within it, thus making the arm adjustable to various lengths or distances that the chair may be from the bracket. The section G2 is preferably entirely tubular and is adapted to receive the cylindrical arm of the frame of the spindle-head O of the usual flexible drivingshaft for driving the drill of an ordinary dental handpiece. The section G2 is also adapted to receive the frame R, carrying the guidepulleys over which pass the driving-cord to operate a suspension handpiece, thus enablin g either of the devices supported in said section G to have a swinging motion at right angles to the supporting-arm.

The weight W is slotted to receive the ex tension 7 of the part G, on which it slides, and has a set-screw inserted in it, which bears against said extension and secures the weight in any proper position which may be necessary to counterbalance the entire arm and its attached drill mechanism.

The rock-shaft F F L can be in one piece, but is preferably made in sections. The section. L is solid, journaled in bearings 19 b on a base-plate II, and bent at right angles to form a crank L, which is bored out longitudinally from its outer end to receive a swivel L (see Fig. 7 which is slotted lengthwise thereof and bored transversely to pivotally seat the lower end of the treadle-pitman 5. The opposite end of the section L is provided with a short collar o,slightly smaller in diameter than the inside of the hollow section F, which it enters, and is pivotally secured therein by a pin passing through both, as shown in Fig. 18, thereby permitting it to have a slight play at angles to the said section F. This prevents any strain on the bearings, which might occur were the rock shaft in one piece. The section F has a feather or spline secured to its interior at the end adjoining the section F. The section F is preferably solid and slides within the section F for the purpose of adjusting the entire shaft to different distances which the chair may be from the wall, and it has a channel or groove y, into which enters the spline cc of the section F to prevent the two sections from rotating upon each other, and is turned off at one end to form a journal with a shoulder which is rotatively seated in the part K. (See Figs. 15 and 16.) The part K is pivotally connected to the part J in such a manner as to permit the rock-shaft journaled therein to be vertically rocked therein in line with its axis, while the said part J is pivotally connected to the bracket I, (which is adapted to be attached to the wall or a standard,) so as to permit said shaft, its base-plate, and treadle mechanism connected therewith to be swung horizontally in either direction,

thereby affording means for locating saidshaft and treadle mechanism in proper relation to the operators chair and the tool-carrying arm of the engine in whatever position they are made to assume. It is not essential that this exact form of universal joint be used; but a ball-and-socket joint or any wellknown form of the same will answer.

The actuating-crank M M is fastened to the section F near the universal joint. Its end is swiveled axially in well-known way, as shown in Figs. 5 and 6. In the construction here shown the crank-arm M is bored longitudinally from its outer end to receive a swivel-section M, which is slotted lengthwise thereof and bored transversely to pivotally seat the lower end of the pitman N N. This construction and arrangement permits the pitman to have three movements-win, a vertical one when the shaft F F L is rocked and two horizontal in vertical planes, one parallel with the axis of said shaft and the other at right angles thereto'thus allowing the said crank-arm to have awide range of positions relative to the drive-wheel crank or wrist-pin without causing any strain or unnecessary friction. The part N has a hook n formed at one end. The other end is screwthreaded and enters the part N, thus enabling the length of the pitman to be adjusted slightly by screwing or unscrewing it.

The connections between the rock-shaft F F L and the driving-wheel G can be adjusted to various distances mainly by hooking the lower chain connection 1" over the hooked pit man N, which may be raised or lowered to complete said adjustment. This process is the same whether the connection is formed by a rod and two short chains or by a single long chain, as previously described.

The base-plate H has the treadle-base h pivoted thereto at its outer edge by a pin or screw 2. The treadle-base h has standards a e, to which the treadle E is hinged. The treadle-base and treadle can be swung horizontally into any convenient position desired by the operator. A

The treadle E is connected to the crank L by a short pitman Z, rounded at its top end to fit a proper bearing in the toe of the treadle, to which it is secured by a screw 3, which enters-it and holds it in place, yet allows the treadle to swing freely around it, while its opposite end is flattened, enters a slot in the swivel end of the crank-arm L, and is pivoted thereto, as previously described.

The modified form of actuating crank-arm V is a simple arm with a hooked end adapted to receive a link of a chain, which can have a free motion in any direction.

The advantage of my invention will be readily seen, as from the description the drivin g-cord passes from the drivin g-whee1 to the pulley on the spindle-head or over the guidepulleys 011 the suspension arrangement, thus actuating a suitable drill carrying handpiece; that the driving-wheel and frame can be swung against the wall or out of the way; that the carrying-arm can be extended, raised, or lowered into a convenient position for use or moved out of the way; that the rock-shaft can pass under the chair or in front of it and extended to suit different distances, and the treadle may be moved into any position without any of the parts obstructing the operator,

and that the drive-wheel, by its chain connection with the swiveled actuating-crank (or its modification) attached to the rock-shaft, can

be operated by the treadle in whatever position said wheel and rock-shaft may assume relative to each other.

Dental engines having the driving-Wheel rotating in a swinging bracket attached to the wall and engines having telescopic supporting-arms are old; so is the off-center spring and the weight and cord to balance said arm.

I claim- 1. In combination with the driving-wheel of a dental engine, a movable base-plate, a double-cranked rock-shaft having one end journaled in the base-plate and a universal joint at the opposite end, a bracket or standard connected with said joint, a treadle for actuating the rock-shaft and a means for connectin g the drivin g-wheel with the rockshaft.

2. In a dental engine, the combination with the drive-wheel of a movable base-plate, an extensible double cranked rock-shaft the rock-shaft provided with a universal joint at one end and the opposite end journaled in the base-plate, a bracket or standard connectcd with said joint and a treadle for actuating the rock-shaft.

3. I11 a dental engine the combination with.

the drivawheel, of a movable base-plate a double-cranked rock-shaft having a telescopic section adapted to move lengthwise, a jointed section adapted to move at an angle with the shaft, a universal joint at one end, the opposite end journaled in the base-plate, a bracket or standard connected with said joint a treadle for actuating the shaft and means for operatively connecting the rockshaft with the drive-wheel; .1

4:. I11 a dental engine the combination with the drive-wheel thereof, of a movable baseplate a rock-shaft consisting of a tube, the spline within the tube, a grooved cylinder sliding within the tube having the groove adapted to fit the spline, a universal joint at one end of the shaft and having the opposite end journaled on the base-plate a bracket or standard connected with the joint a treadle for actuating the shaft and a means for operatively connecting the rock-shaft with the drive-wheel.

5. In a dental engine, the combination with the drive-wheel thereof of a movable baseplate, a rock-shaft, a universal joint at one end of the shaft and the opposite end journaled in the base-plate a bracket or standard connected with said joint a crank on the shaft near the universal joint, the end of the crank swiveled so as to turn at right angles thereto the pitman pivoted therein and having a hooked and screw-threaded section whereby the pitman can be adjusted in length a treadle for actuating the shaft and a means for operatively connecting the rock shaft with the drive wheel.

6. The combination with the drive-wheel of a dental engine of a base-plate a doublecranked rock-shaft having one end j ournaled in said plate a supporting-bracket a universal joint connecting the opposite end of said shaft and the bracket and comprising a block or bearing adapted to swing vertically in another block pivoted to said bracket and swinging horizontally thereon said bracket being adapted to be secured to a wall or standard or formed on the latter a treadle for actuating the shaft and means for operatively connecting the rock-shaft and drive -wheel substantially as described.

7. In combination with the drive-wheel of a dental engine, a base-plate, a rock-shaft having one end j ournaled in said plate, a supporting-bracket, a universal joint connecting the opposite end of said shaft and the bracket,

said bracket being adapted to be secured to a wall or a standard or formed on the latter, a treadle-crank at or near one end of the shaft and a sectional actuating-crank at or near its opposite end said actuating-crank having its outer section or end pivoted axially so as to be adapted to oscillate in a horizontal direction lengthwise with the shaft, a pitman pivoted or journaled in said outer section and adapted to rock or oscillate in a horizontal direction at right angles to the shaft, a treadle for operating the shaft, and a means for operativelyconnecting the shaft with the drivewheel substantially as described and shown. 8. In combination with the drive-Wheel of a dental engine a movable base-plate, a dou- 5 ble-cranked rock-shaft,l1aving; one end journaled inthe base-plate and a universal joint at the opposite end, a bracket connected With said joint and adapted to be attached to a Wall or standard 01' formed on the latter a treadle for actuating the rock-shaft and a IO chain for connecting the drive-Wheel with the rock-shaft substantially as described.

B. S. BRO\VN. Vitnesses:

ARTHUR B. TIAMMOND, E. G. PAnsoNs.

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