USRE10940E - Philip helmer - Google Patents

Description

P. HELMER. ELBGTRO MAGNET-I0 DENTAL HAMMER AND PLUGGEB. No. 10,940. Reissued June 26, 1888'.

UNITED STATES" PATENT ()FFICE.

- PHILIP HELMER, OF CLINTON, IOWA ELECTRO-MAGNETIC DENTAL HAMMER AND PLUGGE R f SCII'ICA'IION forming part of Reissued Letters Patent No. 10,940, dated June 26. 188B- Originnl No. 368,948, dated August 30, 1887. Application for reissue filed May l, 1888. Serial No. 273.1?6.

cl whom it may concern: Teit known that I, PHILIP HELMER, a citizen ot' the United States of America, residing at Clinton, in the county of Clinton and State of Iowa, have invented certain new and useful Improvementsin Electro-Mag'neticDental Mallets and Pluggers, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to'an electromagnetic dental mallet and plugger constructed andoperated as hereinafter fully set forth.

- In the accompanying drawings, Figure l is a side elevation of the mallet. Fig. 2 is alongitudinal central sect-ion of the tool. Fig. 3 shows the battery, magnet, and circuit-breaking devices connected electrically with the ool. Fig. 4 is a crosssection taken on the line a: :r of Fig. 1.

A designates the inelosing-case, constructed of nonmagnetic material. H

B and C designate the outerand inner electric coils, respectively surrounding tubular magnet and space in which reciprocates the core.

D is the tubular'ma-gn'et, of soft iron. E is the inner core or armature, of soft iron. The tubular magnet is open and flanged outwardly at thetop to increaseits magnetic power, and is provided with a closed perforated bottom, as shown.

F designates the head of the tool, of guttapercha-or other insulating material, provided with the binding-posts a a and adjustingscrews 0, a. This head is supported by the non-magnetic posts a a, fastened at their lower ends to the flanges of the tubular magnet, and the posts are flanged inward at the top, forming a seat for the head, which is fastened, by

screws or by any other suitable devices, upon the seat. The screw a is provided with an adjusting-nut, a, which not and screw are supported in place by the bearing 1), fastened to the head, and the screw is extended downward through the head, and its lower end is attached to the upper end of the coil-spring b, which has its lower end attached to the disk-held b of the armature E; The lower end of screw aimpinges upon the disk to regulate the length of the stroke, as hereinafter described.

The armature E is constructed to reciprocate freely in the inner helix, and its lower end is provided with a mallet-rod, I)", of nonmagnetic material, and is extended loosely downward through a central hole in the lower end of the magnet 'D. and through the lower portion of the tool, as shown.

G designates thesupportingbase of the body of the tool, otv gutta-percha or other insulating material, securely fastened in any suitable manner to the lower end of the tubular mag. net, and its upper portion is threaded to fit the threaded end of the case A. This base is provided with the two contact-posts b If and switch b and electrically connected with the wires in or between the electric coils.

H designates the plugger-stem, provided with a socket to receive loosely the pluggerpoint holder c,'which is provided with a socket with a slot to receive the pin 0, inserted through the stem and holder, as shown.

slot in the holder 0 is ,made long enough only to allow the requisite slight reciprocating motion of the holder and point. The points of magnetic attraction in the tool are indicated by the lines o c c a in Fig. 2 of the drawings.

A indicates the electric battery, and B the magnets of the circuit-breaker, constructed, arranged, and electrically connected with the tool in the usual manner.- The base 0 of the magnets is provided with the binding-posts d d d.

The circuit-breaker consists of the magnets Y able contact-point f; The upper end of the spring is attached to the post at, and the upper end of the armature is attached to the spring,

the lower portion of which spring is extended downward and outward to be brought in contact with the adjustable point, as shown.

D is a pendulum-rod attached at its upper end to the lower end of the armature, and is provided with an adjustable weight, d.

The tool is connected with the battery and magnet by the wires f, f and h, connected with the bindingposts, as shown. The core E, disk b", and rod b constitute the parts of the mallet by means of which the blow is produced upon the plugger. preferably securely attached to the lower end The mallet-rod b is' The ' of the armature, as shown; but this rod may be disconnected and caused to reciprocate separately from the armature, if desired.

The connections between the tool, battery, 5 and magnets being all properly made, as soon as the switch is closed, by turning it so as to connect the two contact-points b If, the electric current starts from the battery A, and is .conducted along the'wire f to the bindingpost a, through the coil B, contact-posts, and switch b bib, the coil 0, binding-post a,along the wire f, post d, magnets B, post d armature and spring d d, post (1", along wire h, through post (1', to the battery, thus completing the circuit, and' the core E, tubular magnet I), and cores of the magnets B are magnetized, and the core E is drawn down, causing the lower end of its rod to strike the upper end of the plugger holder 0, producing the blow upon the plngger. At the same time that .the blow is thus produced the magnets B attract the armature d", separating the spring d from the contact-point f, breaking the circuit.

The operation of the circuit-breaker is retarded very slightly by the weighted pendulum to allow the full blow to be produced upon the plugger before the circuit is broken. The parts previously magnetized being now demagnetized, the spring b raises the core E. the pendulum D, armature d, and spring d swing back and again close the circuit, and the operation is repeated in rapid succession and is continued until the switch is opened by moving its free end away from the post The force of the blow upon the plugger is regulated by the adjustment of the tensionscrew a by means of its adjusting-nut. To lessen the force of theblow the screw is moved upward, and to increase the force of the blow the screw is moved downward.

The lengthof the movement of the mallet is increased and lessened by adjusting the screw a upward and downward as required.

The rapidity of the blows mallet may be regulated to the extent required by the adjustment upward or downward'of the weight 11 upon the pendulum. To increase the rapidity of the movements, the weight is moved upward, and vice versa.

It will be noticed that the electric circuit is formed through tl-temagnets of the plugger and the magnets of the circuit-breaker simultaneonsly.

\Vhat I claim as new is 1. In an electromagnetic dental mallet and plugger, the combination oftheinner and outer electric coils, B O, the core E, having the diskhead I)", the mallet-rod b", the adj ustingscrews a. a, the tension-spring b", the tubular magnet D, the posts a a, supporting the head F, the'binding-posts a a, the stem H, the slotted holder 0, and the plugger c, substantially as and for the purposes described.

2. In an electromagnetic dental mallet and plugger, the inner and outer electric coils, B C, the core E, having the disk-head b, the

mallet-rod b, the adjusting devices (d a, the tension-spring b, the tubular magnet D, the supporting devices a a, the binding-posts a a, the stem H, the slotted holder 0, and the pluggcr c, in combination with the magnets B, the contactspring-d, the armature d, attached to the spring, the adjustable contactpoint f, and the'pendulum D, attached to the armature and provided with the adjustable weight d", substantially as and for the purpose described.

3. In an electro-maguetic dental mallet and plugger, the combination of theinner and outer electric coils, BC, the movable core E, having the disk-head b", the mallet-rcd bi, and the fixed tubular magnet D.

PHILIP HELMER.

Witnesses:

Jos. J. FrELDs, J. S. BROWN.

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