US700160A - Dental mallet. - Google Patents

Description

Patented May I3, |902.

J. W. THATCHER.

DENTAL MALLET.

(Application led. Jan. 25, 1902.

(No Modal.)

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JOSEPH W. THA'IOIIER, OF SAN FRANCISCO, CALIFORNIA.

ENTAL MALLET..

SPECIFICATION forming part of Letters Patent No. 700,160, dated 13, 1902. Application led January 25,1902. Serial No. 91,162; (No model.)

To @ZZ whom t mf//g/ concern:

Be it known that I, JOSEPH W. Tnnronnn, a citizen of the United States, residing at San Francisco, in the county ot San Francisco and State of California, haveinvented certain new and useful Improvements in Dental Mallets; and I do hereby declare the following to be a full, clear, and exact description of the inven tion, such as will enable others skilled in the art to which it appertains to make and usc the same.

My present invention relates to improvements in dental mallets; and it has for its objects to produce a mallet electrically operated and one in which the blow delivered follows each successive pressure of the instru. ment against the tooth-filling, thereby distinguishing the device from the mallets new on the market, in which as the electrical contact is made a vibrating motion is assumed. The device is capable of producing a backward as well as a forward malleting blow, thereby rendering the instrument especially valuable where certain diflicult cavities are encountered.

It is manifest that the device can be varied in size and utilized as a riveting, welding', cutting, or drilling` machine.

Other objects and advantages of the invention will appear in the following specification, and the novel features thereof will be particularly set forth in the appended claims.

I am enabled to accomplish the above results by the means illustrated in the aecompanying drawings, in which- Figure 1 is an elevation of the complete device. Fig. 2 is a central vertical section of the same, the tooth being shown in dotted lines. Fig. 3 is an enlarged top View of the insulating-disk and the partsv immediately connected thereto. Fig. f1 is a perspective View of the upper insulating-cap and removable yoke for connecting` the electric wires with the instrument. Fig. 5 isa section on the line oo on of Fig. 1. Fig. G is a View of the insulating-disk, taken in the direction of the arrow in Fig. e. Fig. 'iis an enlarged section of the lower portion of the device. Fig. 8 is an elevation of the same portion. Fig. 9 is a section on line y y of Fig. 7. Fig. 10 is a diagrammatical view of the solenoids, the contactplatesand the cross-reed, with the electrical connections therefor.

Referring now to the above views, 1 represents the tool-shank, to the lower portion of which is removably secured the tool 2, while the upper contracted portion bears the pistons 3 and 4,'the latter being integrally formed on shank v1, while the former is screw-threaded thereon. Between these pistons 3 and t and yieldingly and normallyheld between them by means of the springs 5 and U is the sliding armature 7.

Secured to the upper extremity of the shank 1, but insulated therefrom by means of the mica washers S, is the cross-reed 0.. Encircling the armature 7 is the hollow iron core 10, about which are wound wires 11 to form the solenoids A and I5. This hollow core 10 is extended beyond the solenoid B and is provided with a hollow interior flange 12 to limit the downstroke of the piston 4. 'Io benefit the electrical action of the device, l have slotted longitudinally the core 10, as shown at 13 in Fig. 5.

To the lower end of the core 10 I have connected the terminal casing 14E by means of the threaded hollow plug 15. This plug 15 encircles the shank 1 and is provided with a longitudinal slot 16, into which the cross-pin 17 protrudes from the shank 1. Encircling the shank 1, but interposed between the shank and the inner wall of the plug 15, are the thimbles 1S and 19, which are heldv firmly against the pin 17 by means of the springs 2O and 21. It will be noted that the iianges 22 on the thimbles 1S and 19 are provided to hold the pin 17 normally midway between opposite ends of the slot 16.

On the upper projecting extremity of the hollow core 10 is screw-threaded theinsulating-disk 23, the outer edge of which is screw-threaded to removably receive the insulating-cap 21. Secured to the upper surface of the disk 23 are the metal plates a, l), c, and d. From diametrically opposite points relative to the disk 23 and protruding from the plates c and l) are the pins 25 and 2G, on which are adapted to removably clamp the perforated extremities of the metal yoke 27, formed of two separate arms, each connected with one of the wires IV. The plate a is IOS) formed with the bentback contact-lip 28, while the plate d has the projecting lip 22, which latter is directly over thelip 30, formed on plate c. One end of the wire from each solenoid is connected to the plate I), while the opposite ends of the wires from the upper and lower solenoids are connected to the plates c and d, respectively.

As pressure is brought on the tool 2 by contact with the filling of the tooth, the reed 9, which is held normally midway between the lips 29 and 30, as shown in Figs. G and l0, is forced upward into contact with lips 28 and 29, thereby permitting the electricity to pass from the positive wire through one of the arms of the yoke 27 tothe plate d and through the reed 9 to the plate (l, then through the lower solenoid B to the plate i), and then out through the other arm of the yoke 27 to the negative wire, and consequently the lower solenoid will be energized and Adraw armature 7 downward until it strikes piston 4, thereby producing the desired downward blow. Pressure in the opposite direction on the tool 2 will cause the reed 9 to come in contact with the lip 30 and plate d, thereby energizing the upper solenoid A and causing the armature to strike the upper armature 3, and in so doing produces a backward malleting blow.

From the foregoing description it will be readily understood that in order to fill the tooth the angular tip of the tool 2 is inserted into the cavity, and a forward or backward pressure of the tool on the sides of the cavity will produce the forward and backward malleting blows, as heretofore explained.

I have incased the solenoids by an iron cylindrical cover C, which is held in place by the removable rubber ferrule F.

When it is desired to remove the tool-shank l and connected parts, the pin 17 is removed and the reed 9 turned into the position shown in dotted lines in Fig. 3, when the entire shank is free to be withdrawn.

By reference to FiO'. -l it is manifest that should occasion require it the cap 24, yoke 27, and connected wires lV can be quickly and readily removed from the remaining parts of the instrument or as quickly connected ready for operation.

There are various forms which this device may take on and still be within the spirit of my invention, and I do not desire to confine myself to the exact construction and location of parts herein shown and described.

I claiml. A device of the class described consisting of a pair of solenoids, a tool-holder having a portion thereof movable through said solenoids, an armature slidingly mounted on said holder and in said solenoids and electrical connections.

2. A device of the class described consisting of alined solenoids, a tool-holder movable in said solenoids, an armature slidingly mounted on said holder and yieldingly held in said solenoids, and electrical connections so that movement of the holder in opposite directions will alternately energize said solenoids.

3. A device of the class described consisting of a solenoid, a tool-holder, electrical contact devices operated by movement of said holder, and an armature slidable on said toolholder and adapted to effect said holder for the purpose set forth.

4. A device of the class described consisting of solenoids, a tool-holder protruding from said solenoids, a pin passing through said holder, thimbles encircling said holder and on opposite sides oi said pin, and springs adapted to bear on said thimbles and return said pin to a normal position, andan armature in said solenoids and electrically connected to effect said holder.

5. A device of the class described consisting of solenoids, a tool-holder, a reed on said holder, contact devices in the path of said reed, a spring-yoke adapted to removably engage said contact devices, and electric connections between the several parts.

G. A device of the character described, consisting of solenoids, a tool-holder having a portion thereof movable through said solenoids, electrical contact devices to coact with said solenoids, a yielding element between said contact devices movable by the said toolholder to alternately energize the solenoids, and an armature slidable on the tool-holder, and electrical connections.

7. In a device of the character described, the combination with a pair of solenoids, a tool-holder movable through said solenoids, pistons arranged apart upon the tool-holder, an armature slidable within the said solenoids and adapted to engage the said pistons, and electrical connections.

S. A device of the class described, consisting of alined solenoids, a tool-holder, an armature operated by said solenoids and having a movement independent of the said toolholder, electrical means 'for energizing said solenoids and means whereby the movement of the said holder will cause the said solenoids to be energized alternately.

In testimony whereof l affix my signature in presence of two witnesses.

JOSEPH VI. 'llllATtfllEl-l.. lVitnesses:

Geenen PA'r'risoN, Emz. Kinofilm.

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