US379064A - Emery m - Google Patents

Description

(No Model.) 1

E. M. HAMILTON.

TELEGRAPH SOUNDERQ,

Patented Mar. 6, 1888.

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UNITED STATES PATENT OFFICE.

EMERY M. HAMILTON, OF NEW YORK, N. Y.

TELEGRAPH-SOUNDER.

SPECIFICATION forming part of Letters Patent No. 379,064, dated March 6, 1888.

Application filed March 13, 1885. Renewed August 29, 1887. Serial No. 248,165. (No model.)

To aZZ whom it may concern..-

Be it known that I, EMERY M. HAMILTON, of the city of New York, in the county and State of New York,and a citizen of said State, have invented certain Improvements in Telegraph-Sounders, of which the following is a specification, reference being had to the ac-v nation, with the vibratory armature-lever having said stops and retracting-spring, of the pointed fulcrum-pins hereinafter particularly described,suitably supported beneath the said lever and engaging the hereinafter-described recesses or depressions on the under face of said lever, all as and for the purpose specified, and as more at length recited in the claim.

The usual way of pivoting the said lever in the class of instruments referred to is by means of trunnions projecting from the sides of i the lever, or by screw-shafts with tapering or conical ends that enter correspondingly-shaped recesses in the ends of the trunnions, which have a rotary motion on the said points. I have heretofore made an improvement in the fulcruming of this class of levers, for which United States Letters Patent No. 269,521 were granted to me December 26, 1882, said improvement consisting in pivoting the lever upon a sharp-edged rib extending transversely across the body of the lever and entering a correspondingly-shaped groove in the face of the lever.

My present fulcrum-joint differs from both of the above named. It consists of two sup ports with conical or tapering ends, upon or against which the lever rests or on which it vibrates, the lever being provided with correspondingly-shaped recesses or indentations, into which the said supporting-points enter.

Referring to the drawings, A is the vibrating lever of a telegraph-sounder, B being the magnet, and 0 its armature, attached to said lever, all mounted on a suitable base,D. This lever is fulcrumed on two supports, a a, (shown in dotted lines in Figs. 2 and 3,) which may be parts that rise from the base D, but are preferably two short shafts or pins set in ribs or projections b 12, formed on and integrally a part of the casing of the magnet B,the said pins each being provided with a collar near its outer extremity that rests down upon the end of said rib. The outer ends, a a of the said pins are conical or tapered to points. The lever A is preferably cruciform, as shown in the drawings. The ends of the crossbar d extend over the points a a, so as to rest thereon, and are provided with tapering indentations or recesses e e,to receive the points of the pins a a. The bottom of the recesses and the extremities of the points are preferably slightly rounded, as plainly seen in Fig. 3. The angle of the points is slightly more acute than that of the recesses, so as to permit the free vibration of the lever on the points.

E is a spiral spring, one end of which is at tached to the short end lever at f, and the other is wound onto a suitable rotary shaft,F, by which the tension of the spring is regulated in the usual way. The end 9 of the long arm of the lever is arranged to vibrate between the stops or heads h h, that are vertically adj ustable, by means of screw-threads, on a standard, G, that rises from. the base D, the stops limiting the movement of the lever giving the sound in telegraphing. It is obvious that by this construction and arrangement of parts the lever is continually under the stress of the said spring, acting to press it upon the points a a, which pressure is increased by the movement of the armature, under the influence of the magnet, in making the downstroke of the lever.

The most important advantages of the described fulcrum-joint over other fulcrum-joints heretofore used for the levers in this class of instruments are, first, that actual and uniform contact of the parts is insured in the joint,and without any readjustment of the parts after the instrument is made; second, all lateral shifting or movement of the lever is entirely obviated, and the vibration of the lever, always in one and the same plane, is secured;

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third, if any Wear in joints occurs, such Wear instrument having an armatureiever vibradoes not in any degree impair the working of tory between stops and provided with a rethe lever; and fourth, these joints are easily and cheaply made.

The instrument I have shown in the drawings is a telegraph-sounder; but it is obvious that the described fulcrumjoints are adapted I to be used on all analogous instruments, such as telegraph-keys, relays, &c.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is

In a telegraph-sounder or other telegraphtracting-spring, the combination, with the ar mature-lcver and its stops and retractingspring, of conical-ended fulcrum-points supported beneath the lever and recesses in the under face of said lever adapted to engage said points, as and for the purpose specified.

EMERY M. HAMILTON. I11 presence of- A. G. N. VERMILYA, HENRY EIOHLING.

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