US238950A - Henby s - Google Patents

Description

AH. S..MILLBR DentalPlugger and Burr'.

No. 238,950. Patented March15,1s8|.

NAPETEHS. FHOTOvLITHoGRAPHER. WASNINGION. D. Q.

UNITED STATES l PATENT OEETCE.

i HENRY S. MILLER, OF ROCHESTER, NEW YORK.

DENTAL PLUGGER AND BURR.

SPECIFICATION forming part Of Letters VEateIlt N0. 238,950, dated. March 15, 1881.

` Application mea March 17,1880. (Model.)

To all whom it may concern:

Be it known that I, HENRY S. MILLER, a citizen of the United States, residing at Rochester, Monroe county, New York, have invented a certain nen7 and useful Improvement in Dental Burrin g and Plugging Instruments; and I do hereby declare that the followingis a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which' Figure l is a central longitudinal section of the instrument arranged as a burring-instrnment. Figs.l2, 3, 4, and 5 are detail views of the same. Fig. 6 is an enlarged section of the operating end arranged as a plugging-instrument. l y y My improvement relates to combined burring and plugging instruments 'which can be connected with a dental engine, by which rotary motion is imparted, and which canbe converted from one use to the other by the employment of an engaging and disengaging device that is under control of the operators finger.

The invention consists in the construction and arrangement of Aparts hereinafter more fully described and claimed. y

In the drawings, A represents thecylindrical body of the instrument, which is of usual form.

B is a small shaft or spindle, which extends through the cylinder and projects at the rear end, as shown at a, and is connected with the dental engine in a well-known way, so that rotary motion is imparted'to `the spindle.

G is a plug or bearing screwingin to the rear end of the cylinder, and forming the bearing for the spindle at that point, the spindle being retained against end movement by` shoulders b b.

D is a mallet or hammer, which slides free on the spindle within the case.

E is a coiled spring, which fits around the spindle and bears upon the mallet.

F is a collar, which rests against the spring, and Gr is a nut forming afollower, which screws up and down upon a thread cut on the spindie and bears against the collar. This nut has a slot, c, like a screw-slot, and with this slot engages the bit d of a spring, H, which is pressed down by the finger of the operator.

When so pressed down the spring holds the nut from turning, and the spindle turning therein causes the nut to move, down on the screw-thread, thereby compressing the spring and increasing the force of the blow of the mallet.

I is the burring-tool, which enters a socket at the end of the spindle, and is secured in place by the following means: The shank end of the barring-tool is notched out, as shown at f, Fig. 5, leaving a right-angled offset lug, g. The bottom of this end is also squared or iiattened, as shown ath. The body of the spindle is provided with` a longitudinal groove, z', and on one side of this is an offset notch, k. When the shank of the barring-tool is inserted in the socket of the spindle, the lug g cornes opposi tethe notch la, and by turning the tool axially i thelug strikes into the notch.

K is a locking piece or key which rests in the groove It has a projecting point,l, which enters a hole in the mallet, and it also has a horizontal extension, m., of such size and form as to slide under the attened end, h, of the burring-tool shank, and thus'prevent it from turning when the lug g is locked in the notch k, as before described. The locking-piece K rides up and down with the mallet, its end m sliding up and down under the'iiattened end li, and the locking-piece also serves4 to keep the mallet from turning by resting in the groove i. When the mallet is raised to its highest point, the end m is freed from the tool-shank, and the latter can then be removed by turning it back, so as to free it from the notch la and drawing it out. If desired, the mallet may havean additional spline orfeather to keep it from turning. This is a simple and convenient device for lockin g the tool in place and keeping the mallet from turning axially, as the tool is thereby rendered perfectly stiff and solid, and the exterior surface of the spindle is left flush for theipassage of the mallet. The locking-piece is easily engaged and disengaged. A cam is formed near the lower end of the mallet, consisting of an inclined shoulder, n, and a vertical abrupt offset, u', to same, as shown in Figs. 2 and 3.

Il is a linger-piece, having a lug, p, which is capable of engagement with or disengagement from the cam. It is preferably made in IOO ' the form of a spring, as shown, so that when pressed down by the finger it will engage with the cam, but when released it will rise out of engagement. When the finger-piece is pressed down so as to engage with the cam, the latter will ride upon the finger-piece as it rotates, and will alternately rise and fall, thereby producing a sharp blow or concussion.

If desired, the lug of the finger-piece may h ave a small friction-wheel which bears against the shoulder of the cam, and the sides of the mallet may also have small friction rollers, which travel on the interior of the case A, the object being to decrease friction.

When the instrument is used as a plugger, the burring-instrument is removed and a plugger, J, is employed. It is attached in the following manner:

Y M is a hollo7 socket which is screwed into the front end of case A.

N is a tube which slides freely but accurately within this socket, and has a stroke sufficient to produce the necessary concussion in plugging. On the inner end of the tube is a shoulder, s, which rests in contact with the mallet, and at the outer end is a socket, t, into which screws the plugging-tool J. The socket and tube remain attached to the case at all times, and it is only necessary to change the tools or points to change the work.

rlhe operation is as follows: The instrument is connected with the dental engine, and the shaft B receives a continuous rotary movement, carrying with it the nut c, the collar F,

spring E, mallet D, and burring-tool I. To convert the instrument into a plugger the tools are changed, and the nger-piece L is pressed down to engage with the cam on the mallet, which causes the latter to rise and fall and produce blows upon the plugger. The whole is accomplished by a simple rotary movement of the spindle, and saves the necessity of two separate and independent instruments for the purposes. The same effect may be produced 'by making the spindle B in sections, or intwo` or more separate lengths, and connecting themv by slides or other engaging and disengaging connections.

One special advantage consists in the use of the engaging and disengaging device L, by which, when the instraiment is used as a plugger, the motion of the mallet can be controlled at pleasure, either by pressing said device down to engage and produce concussion, or by allowingit to retract, which stops the motion, so that by the use of this device, while the shaft is under constant motion, the operator can apply the concussion to the filling, can stop to insert the filling or adjust the same, or can use the plugger simply to produce hand pressure on the filling, as the exi- This obviates the great gencies may require. objection to those pluggersr which are operated directly from the dental engine, but have no engaging and disengaging device by which the motion can be controlled. This arrangement enables the operator to stop the concussionsof the mallet, and to pick up and carry the gold to the cavity with the instrument, and to press the gold into the cavity 7o the key-piece K is slightly tapering or wedging, so that it takes up the wear on the under side of the tool-stock I, and also the wear upon the key itself, by which means the parts will always be kept tight.

I am aware that in Patent No. 162,154 is shown a cam-ring operated upon by a springplunger. In Patent No. 156,796 is shown a tool-shank having an offset lug, which turns into a side notch, and is secured by a slide; and in reissued Patent No. 7,107 is shown a socket or holder at the end of the case for receiving the tool-shank. Such devices I eX- pressly disclaim.

What I claim as new is- 1. In a combined burring and plugging instrument, the combination, with the revolving spindle and the mallet resting and sliding thereon, of an engaging and disengaging device under the control of the operators iin ger, so arranged, as described, that in its normal position 4it allows the spindle to revolve free and without giving motion to the pluggingtool, but when pressed inward it engages with the mallet and causes the mallet to produce concussions to operate the plugging-tool, as herein set forth.

2. In a combined burring and plugging instrument, the combination of a revolving spindle extending through or nearly through the case, a mallet resting on and turning with the spindle, but having a free sliding movement endwise, a cam at the end of the mallet, and an engaging and disengaging device outside the case, with which the cam engages when said device is pressed inward, as herein shown and described.

3. In a combined burring and plugging instrument, the combination, with the nut G, screwing upon the spindle B and compressing the spring E, of a slot, c, formed in the nut, and a spring, H, outside the case, provided with a lug, d, which, when pressed inward, engages with the slot and holds the nut stationary, while the spindle revolves within it to move it forward or back, as herein shown and described.

4. The combination, with the slotted spindle B and hollow mallet D, of the separate keypiece K, attached to the mallet and sliding in the slot of the spindle,as herein shown and described.

5. The combination, with the tool-shank I, provided with the offset lug g and flattened end h, of the corresponding offset notch 7c in the spindle, to receive the lug g when turned therein, to prevent the tool being drawn out, and the key-piece K, provided with the wedge- ICO IIO

IIS

a barring-tool may be inserted `in the end of the spindle, without the use ot extra parts, as herein shown and described.

In lWitness whereof I have hereunto signed 15 my name in the presence of two subscribing Witnesses.

HENRY S. MILLER.

Witnesses:

UHAs. F. SPENCER, R. F. OsGooD.

Images