US769758A - Dental instrument. - Google Patents

Description

No. 769,758. PATENTED SEPT. 13, 1904. J. MILLS.

DENTAL INSTRUMENT.

APPLICATION FILED JUNE 20, 1903.

NO MODEL.

74? 71 @2315 88 4/1 V Q14 ("0r ./QWM W Patented September 13, 1904.

PATENT OFFICE.

JOHN MILLS, OF BRANTFORD, CANADA.

DENTAL INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 769,758, dated September 13, 1904.

Application filed June 20, 1903.

To all whmn it may concern.-

Be it known that I, JOHN MILLs, D. D. 8., of the city of Brantford, in the county of Brant, Province of Ontario, Canada, have invented certain new and useful Improvements in Dental Instruments, of which the following is a specification.

The object of my invention is to devise an attachment for a dental engine whereby the rotary motion of the engine may be converted into a reciprocating rectilinear motion for operating, cleaning, and burnishing tools or other instruments for which such a motion is desirable; and it consists, essentially, of a hollow casing adapted for attachment to the handpiece of a dental engine, a rotary part journaled within the casing and provided with a spindle for connection with the rotating spindle of the handpiece, a reciprocating tool socket-piece slidably supported in the casing, a grooved cam formed on or connected to the rotary part, and a projection on the tool socketpiece adapted to fit the cam-groove, the whole being constructed in detail substantially as hereinafter more specifically described and then definitely claimed.

Figure 1 is a side elevation, partly broken away, of the instrument. Fig. 2 is a sectional elevation of the central or main part of the casing, showing the rotary part of the instrument journaled thereon. Fig. 3 is a sectional elevation showing the method of adjusting the bearing of the rotary part of the instrument. Fig. L is a sectional elevation of the main part of the casing and the tool socket-piece, the view being taken on a plane at right angles to Fig. 1.

In the drawings like letters of reference indicate corresponding parts in the different figures.

Referring particularly to Fig. 1, it will be seen that the casing of the instrument comprises three partsa central or main part A, a forward portion B, and a rear portion (J. The partC of the casing is so shaped and proportioned as to lit the handpiece of an ordinary dental engine. For this purpose it also has a notch a cut in its end. This portion (J is detachably connected to the main portion Serial No. 162,404. (No modal.)

' A, preferably by being screwed thereon, as shown. The forward portion B of the casing slips over the main portion, as shown, and is held in position by means of a screw 1). The main portion of the casing has oppositely-set cone-bearings D and E formed therein. With these hearings are engaged the cones F and G, connected to the rotary part H of the instrument. This rotary part is extended into a spindle 0, which is adapted for connection with the spindle of the handpiece of the dental engine.

It will be noted that the cone G is formed integral with or rigidly secured to the spindle 0, whereas the cone F is screwed onto the spindle, so as to be adjustable thereon, its end being provided with a slot for engagement by a screw-driver. It is also preferable to use a jam-nut L. Means are thus provided for taking up any wear of the bearings. The cone F, it will be noticed, is provided with a cylindrical portion in which is cut a peripheral cam-groove I. This cylindrical portion, it will be noticed. is inclosed within the main part of the casing, but the latter has a notch (i cut at one side, exposing the cam-groove.

A tool socket-piece J is slidably supported in the forward part B of the casing and has a finger K formed thereon, which fits within the notch (Z of the main part of the casing. On this linger is formed or secured a pin (2, which enters the cam-groove I. This pin might of course be a roller, if necessary, to reduce friction.

"hile the tool socket-piece may be of any description, I prefer to form it as shown in Fig. 1, a hole being bored therein threaded at its inner end. This enables what are gen erally known as cone-socket instruments to be connected therewith.

From the construction described it is evident that rotary motion conveyed to the spindle 0 of the rotary part of the instrument will through the medium of the cam-groove be converted into reciprocating rectilinear motion of the tool socket-piece J. Thus a new tool movement is provided for dental operations which is particularly adapted for cleaners, burnishers, and other prophylactic instrurnents. The movement might also be applied to dental pluggers, though not to such advantage. Y

While the construction of the casing is that which I prefer, as giving the readiest access When necessary to the working parts, yet

other constructions might of course be employed.

Changes might also be made in the precise construction of the parts Which produce the conversion of motion.

What I claim as my invention is- 1'. In adental instrument a main casing having a pair of oppositely-set cone-bearings formed therein; in combination with a rotary part having cones thereon adapted to engage the hearings, one of the cones being longitudinally adjustable on the said rotary part; a cylindrical extension of one of the cones having a peripheral cam-groove formed therein, the casing being notched at one side to expose the cam-groove; a front casing sleeved over one side to expose the cam-groove; a tool socket-piece slidably carried inthe front casing; a finger on said socket-piece fitting the notch in the main casing; and a pin on said finger engaging the cam-groove, substantially as described.

Brantford, June 10, 1903,.

JOHN MILLS. In presence of- A. C. HARDY, I. BAXTER.

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