US237776A

US237776A - James c

Info

Publication number: US237776A
Authority: US
Publication date: 1881-02-15
Anticipated expiration: 1898-02-15

Description

(N0 Model.)

J. O. REED. Circuit Breaker for Relays and Sounders.

No. 237,776. Patented Feb. 15, I881.

Fig-1- NJHERS, PHOTO LH'HOGRAFHE? WASMNGTON 0 c UNITED STATES PATENT FFICE.

JAMES C. REED, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 237,776, dated February 15, 1881.

Application filed June 11, 1880. (No model.)

To all whom it may concern:

Be it known that I, JAMES (J. REED, of the city, county, and State of New York, have invented certain new and useful Improvements in Circuit-Breakers; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings,forming a part of this specification, in which Figure 1 is an elevation, and Fig. 2 a crosssection, of a detached portion of the device embodying my invention.

This invention relates to telegraphic or other instruments in which a vibratory armaturelever is attracted to a magnet and separated therefrom by mechanical means-as in telegraphic relays, recorders, sounders, &c.

Various expedients have heretofore been employed for retracting the armature-lever from the magnet-such, for example, as the retractile force of a spring; and special means have been devised having no other object than to prevent the armature from sticking to the faces of the magnet by reason of 'the residuary magnetism. Other devices for regulating the proximity of the armature-lever to the magnet, the rapidity of its vibrations, and the ad- I justment of its retractile force, have also been applied.

The object of my invention is to produce the essential functions of. an instrument of this class by a simplified construction of the armature-lever, whereby it is retracted without the assistance of additional devices, and its proximity to the magnet regulated by a simple and efficient attachment.

In order that others may understand my invention, I will first proceed to set forth the construction, arrangement, and operation of the parts of a device embodying it, and subsequently to point out in the claims its novel characteristics.

In the drawings, M represents an electromagnet consisting of a single bobbin mounted upon a suitable frame-work, which may be secured to a table or sounding-board in any wellknown manner, the vibrating armature-lever A being pivoted at a to the frame-work, and arranged to vibrate to and from the magnet in a direction parallel to itself.

The armature-lever A is preferably constructed of a bar or rod, with its long arm I) gradually increasing in size toward the free or vibrating end, and its short arm 0 provided with the adjustable counterpoise d. The object in constructing the long arm I) of the armaturelever A of greater thickness or size at its outer end or near the core of the magnet is to effect its retraction by the force of gravity, thereby dispensing with additional devices for the purpose.

It is obvious that the additional weight distributed near the outer end of the armaturelever may be produced by ditterent forms of thelever; butthe form shown-that of a gradually -increasing thickness from its pivoted point-is well adapted to the action of the adjustable slide B, which regulates the proximity of the armature to the magnet. This slide or gage Bis fitted to and adjusted upon a straight rigid bar, 6, connected to the framework and arranged parallel to the vibrating armature-lever upon which the slide moves. The rigid bare may be inclined or beveled to produce the same result. The slide 13 is constructed to inclose the bar 0 and armaturelever A (shown in section, Fig. 1) with sufficient space to permit the free vibration of the armature therein to the desired extent and according to the position of the slide, which, when adjusted from the fulcrum and toward the free end of the armature-lever, decreases the distance of the latter from the magnet, and also the extent of the vibrations, and vice versa when the slide or gage is adjusted in the opposite direction.

It will be seen that the retractile force of the armature-lever A is constant in this device, and cures a defect existing in the use of a spring for this purpose, for the reason that when the armature is brought nearer to the magnet the attractive force increases more rapidly than the retractile force of the spring.

The function of the counterpoise (1, arranged upon the opposite or short arm 0 of the armature, is to increase or diminish the weight of the long arm I), and is too well understood to need further description.

Having thus fully described the construction and operation of the parts containing my improvements, it is deemed unnecessary to repeat herein the principle of operation or the in combination with a device for regulating the extent of its vibrations, substantially as set forth.

2. A vibrating armature-lever of an electromagnet, in combination with an adjustable sliding gage, E, whereby the proximity of the armature to the magnet and the extent of its vibrations is regulated.

JAMES C. REED. Witnesses:

J. H. BARCLAY, O. W. FORBES.