US600243A - Angle attachment for dental handpieces - Google Patents

Description

(Model.)

H. CASE & E. D. SHAW. ANGLE ATTACHMENT PoE. DENTAL EANDPIEOES. No. 600,243.

Patented Mar. 8, 1898.

NNN" AMEN UNTTED STATES PATENT EEicE.

HENRY OASE AND EDMUND D. SHAW, OF GLOVERSVILLE, NEV YORK.

ANGLE ATTACHMENT FOR DENTAL HANDFIECES.

SPECIFICATION forming part of Letters Patent No. 600,243, dated March 8, 1898. Appiicaiioii filed Aprii 2, 1897. stanno. 630,454; (Model.)

act description.

This invention relates to what are commonly known as handpieces for dental engines, the same being the grip implement or device in which the bit or tool is secured and by which said bit or tool is manipulated in performing dental work.

Ordinary handpieces have had the single capacity of holding the bit or tool in a straight line therewith; but there are handpieces in which the tool-socket has been constructed with the capacity of adjustment to an angle to the handpiece.

Our invention relates to dental han dpieces of the last-named variety; and our invention consists in a tool or bit socket for dental handpieces jointed in such a manner as to be capable of being secured in a straight line with the handpiece and to be adjustedfrom such alinement at an angle to the longitudinal axis of the handpiece, together with means for securing the -bit or tool, and other structural features and combinations thereof, all as we will proceed now more particularly to set forth and finally claim.

In the accompanying drawings, illustrating our invention, in the several figures of which like parts are similarly designated, Figure l is a side elevation of a handpiece embodying our invention and showing the tool or bit socket in its two extreme positions. Fig. 2 is a longitudinal section on a greatly-enlarged scale. Fig. 3 is alongitudinal section taken in the plane of line 3, Fig. 2, and at right angles to the plane of the section shown in said Fig. 2. Fig. l is a cross-section in the plane of line 4 4, Fig. 2. Fig. 5 is a bottom plan view of the socket end. Fig. 6 is a section similar to Fig. 3, but showing the gearing in elevation. Fig. 7 is a section taken in the plane of line 7 7, Fig. 5. Fig. 8 is a section illustrating the application of our socketpiece to an ordinary handpiece.

a is the shaft-spin dle, arranged in the casing Z), which latter is provided with a screwthread h for connection with the ordinary shaft-sheathing.

c is the grip or handle, and o is a screwthreaded joint for connecting the casing and grip in a detachable manner.

CZ is the shell of our socket-piece, within which is supported the spindle e, said spindle being adapted to be connected with the spindle a by any suitable joint f. The shell d is provided with the jaws g g', partly open on one side (see Figs. 2 and 5) and closed on the other side. Between these jaws is hung the tool or bit receiving device or socket h by means of the screw-studs 'L' i. The socket is provided with a tubular projection h', which is constructed with the removable tip h2. Vithin the tubular projection 77. is arranged the chuck k, which is provided near its bottom with a cross-pin 7c. The projection 7L' is provided with a lever l, having a point Z', which engages a groove m in the shank of the bit or tool m, the said shank, further more, having the forked end m2 to engage the pin la of the chuck 7c. The lever Z is pivoted in the tip h2 of projection h and in such manner as to have suflicient play when lifted in the direction of the arrow, Fig. 2, to become disengaged from the groove m to allow the bit or tool to be withdrawn.

As will be seen, the pivot of the lever is at right angles to the axis of the tool, and the lever therefore moves in the line of thrust of the tool. Hence the tool cannot work loose from its lever, and the lever lying in the longitudinal plane of the tool and handpiece cannot become detached in use. Were the pivot in line with the tool, and the lockinglever movable at right angles to the tool, the operation of the tool would tend to disturb thelocking-lever, especially after the joint had become worn by use, and thus the security of the tool would be impaired.

The socket is provided with a number of holes h3, which are adapted to be engaged by,

a pin n on a spring-arm n', which is secured to the shell CZ by a screw n2. This spring n' is held in engagement with and released from the socket by means of a rotary sleeve o, having an internal cam-surface o for that purpose. By rotating the sleeve o its cam-surface depresses the spring n', so as to cause its IOO pin n to enter that hole in the socket h which is in register therewith, so as to hold the said socket rigidly in any given angular position with relation to the handpiece, and by rotating the said sleeve in the oppositedirection the said spring is released and carries its pin out' of engagement with the socket to permit the vsocket to be given a new adjustment.

1 The adjustments of which the socket of the illustration is capable extend within an arc of ninety degrees, so that the said socket may be arranged with relation to the handpiece in a manner to bring the bit or tool in alinement with the said handpiece and from that position to a position ninety degrees distant therefrom or any intermediate position the two extremes being illustrated, respectively, by full and dotted lines in Fig. l.

The rotarymotion of the driving shaft or spindle d is transmitted to the bit or tool by means of a train of gearing consisting of a bevel-pinion p on the end of spindle e, meshing with a bevel-and-spur wheel g, which is supported upon the screw-stud r, the said bevel-and-spur wheel meshing with a spurwheel s, which rotates on a projection s' of the socket h, and the said spur-wheel s meshing with a matching toothed wheelt on the chuck k. By this means of gearing, the bitsocket h is given perfect freedom of movement for adjustment, and at thesame time the bit is positively driven in whatever position its socket may be arranged.

The screw fr, in addition to performing the function of a support for the wheel q, also serves to draw the jaws g g together and to assemble the parts betweenthe said jaws in a compact manner. By removal of this screw r and the removal of the screws t t" the parts may be taken out for inspection and repair and other purposes.

The shell d may be secured to the handpiece by means of a set-screw u, and a guidepin o or by any other suitable device.

In order to conceal the gearing, the movable socket is provided with a hinged cover w, which moves within the closed side of the head of the shell d between the jaws, the said cover being pivoted to the socket.

The jawsmay be provided with a wall or plate g2, and this plate closes the cavity conktaining the gearing hereinbefore referred to.

Our invention is applicable to other forms l of handpieces-as, for instance, that illustrated in Fig. 8, wherein the spindle e has its end slabbed off, as at e', for connection with the similar terminal of-'the motor-shaft-and we wish to be understood as not limiting our invention to any particular form of handpiece. d

The modiiications already described and others obviously within our invention we tool socket pivoted or hinged at one end and' adapted to be moved into a straight line with said handpiece and into any1 desired number rof angular positions with relation thereto, a

chuck arranged to rotate in said socket and provided with a toothed wheel, a tool carried by the chuck, a lever pivoted on said socket and extending lengthwise thereof, with its pivot at right angles to the axis of the tool, the said lever acting in the line of thrust of the tool and adapted to hold the tool in place in the socket, a driving-spindle, and anl interposed train of gearing for transmitting motion to the chuck, substantiallyas described.

2. In a dental handpiece, asocket-piece terminating in parallel jaws, a bit or tool receiving device or socket pivoted between said jaws, and adapted to be moved into alinement with the longitudinal axis and also at an angle thereto, a tool-chuck arranged to rotate in said socket and provided with a toothed gear, a tool or bit carried by said chuck, a lever pivoted in said socket on a pin arranged transversely of the socket, the length of the lever extending in the line of thrust of the tool to hold the tool in place in the socket, a driving-spindle, and an interposed train of inclosed gearing for transmitting motion to the chuck, substantially as described.

3. A dental handpiece, having its bit or tool socket pivoted or hinged at one end and adapted to be moved into a straight line with said handpiece and into any desired number of angular positions with relation thereto, a chuck provided with a transverse pin at its bottom, and arranged to rotate in said socket and also provided with a toothed wheel, a tool or bit having a forked end to engage the pin in the chuck and a circumferential groove to be engaged by a locking-lever, a lever pivoted on said socket and extending lengthwise thereof Vwith its` pivot at right angles to the axis of the tool, the said lever engaging the circumferential groove of the tool or bit and acting in the line of thrust thereof and adapted to hold thev tool in place in the socket, a driving-spindle and an interposed train of gearing for transmitting motion to the chuck, substantially as described.

4. A socket-piece for dental handpieces, having the jaws closed on one side and partly closed on the other, a bit or tool receiving device or socket, pivoted between and in said jaws, a rotary chuck within said tool-socket, a toothed wheel thereon, a bit or tool carried by said chuck, and having a forked end, a pin in said chuck to receive the forked end of the bit or tool, a lever pivoted on a transverse pin to the bit-socket in the line of thrust and adapted to lock the bit in the socket, a driving-spindle having a bevel-gear, and a train of gear-wheels concealed within the socketpiece andconnecting said bevelgear and chuck, substantially as described.

5. A socket-piece for dental handpieces, having a bit or tool socket, pivoted in its end and at right angles to its longitudinal axis, and adapted to be adjusted to bring the tool or bit into line with or at an angle to the hand- IIO Ivo

piece, a spring-detent to hold the said tool or bit socket in such adjusted position and a rotary cam-sleeve for locking and releasing the detent, substantially as described.

6. A tool or bit socket for dental handpieces, and a tool or bit carried thereby, the tool-locking lever l pivoted in said socket on a transverse pin, the operating member of which lever is arranged in a straight line with the bit and its point Zarranged at right angles to the bit and in the line of thrust, to hold the bit in position, substantially as described.

7. A socket-piece for dental handpieces, having terminal jaws, a bit or tool socket, pivoted between said jaws, and a screw, as fr, passing transversely through the jaws and adapted to adjust them, substantially as described.

8. A sooketpiece for dental handpieces, terminating in jaws, a bit or tool socket pivoted between the said jaws, gearing contained within the jaws for transmitting motion from the driving-spindle to the driven shaft, and a cover w hinged to the bit or tool socket and movable therewith and covering in the gearin g, substantially as described.

In testimony whereof we have hereunto set our hands this lst day of April, A. D. 1897 HENRY CASE. EDMUND D. SHAW. Witnesses:

JAMES I-I. DRURY, GEORGE H. SIMPSON.

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