US439959A

US439959A - Telegraph-key

Info

Publication number: US439959A
Authority: US
Publication date: 1890-11-04
Anticipated expiration: 1907-11-04

Description

(No Model.)

W. A. J. KOHRN. TELEGRAPH KEY.

No. 439,959. Patented Nov. 4, 1890.

WITNESSES.

INVENTOH fi lw %l/M z $5., 1 BY We/Q w A TTOHNEYS UNITED STATES PATENT OFFICE.

WILLIAM A. J. KOHRN, OF SAN FRANCISCO, CALIFORNIA.

TELEGRAPH-KEY.

SPECIFICATION forming part of Letters Patent No. 439,959, dated November 4, 1890.

Application filed May 10, 1890. Serial No. 351,236. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM A. J. KOHRN, of San Francisco, in the county of San Francisco and State of California, have invented a new and useful Improvement in Telegraph- Keys, of which the following is a specification,

reference being had to the annexed drawings,

forming a part thereof, in which Figure 1 is a plan view of my improved telegraph-key. Fig. 2 is a plan view of the circuit-closing switch. Fig. 3 is a side elevation, and Fig. 4 is a transverse section taken on line on m in Fig. 2.

Similar letters of reference indicate corresponding parts in all the Views.

The object of my invention is to provide a telegraph-key in which the circuit will be perfectly closed by the circuit-closing switch, and in which at the same time the contactpoints will be brought together, so as to prevent any accumulation of dirt upon the contact-surfaces. I

My invention consists in the combination, with the key, of a circuit-closing switch pivoted to the frame of the key and adapted to swing under the anvil-tongue in the usual way, and provided with a beveled arm arranged to engage a spring projecting downwardly from the key-lever, so as to force the rear end of the key-lever upward,closing the circuit at the contact-points of thekey as well as between the circuit-closing switch and the anvil-tongue, all as will be hereinafter more fully described.

The trunnions a of the key-lever A are pivoted in screws 1), passing through ears 0 on the frame B. To the front of the frame is attached the usual anvil 0, provided with the contact-point d and tongue 0. The key-lever A is furnished with a contact-pointy, arranged opposite the contact-point d of the anvil C. To the under surface of the key-lever A, be-

tween the trunnions a and the rear end of the lever, is secured a fiat spring D, extending downwardly and rearwardly with its free end turned up toward the keylever, as shown.

To the frame B, in the right-hand side thereof, is pivoted a circuit-closing lever E, provided with the curved finger g, which extends rearwardly and is provided with the beveled or wedge-shaped end h, as shown in Figs. 3 and 4. The circuit-closing lever E is capable of sliding under the tongue e, and its wedge-shaped end is adapted to slide under the free end of the spring D, causing the keylever A to tilt and bring the point f into contact with the point d. It will thus be seen that the circuit is closed through thccontactpoints of the key, and also through the circuit-closing lever E. By means of this double device the closing of the circuit is insured whenever the lever E is moved toward the anvil 0.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination, with a telegraph-key, of a circuit-closing lever pivoted to the keybase and provided with a curved finger adapted to force the contact-point of the keylever into contact with the anvil-point, substantially as specified.

2. In a telegraph-key, the combination of the key-lever A, provided with the contactpoint f, the spring D, attached to the key-lever, and the circuit-closing lever E, adapted to slide under the anvil-tongue e, and provided with the curved finger g for engaging the spring I), substantially as specified.

WILLIAM A. J. KOHRN.

Witnesses:

A. B. ST. JOHN, CHAS. C. DERMAN.