US1311648A - Relay - Google Patents

Description

R. M. HOPKINS.

RELAY. APPLICATION FILED JUNE 15. 1911.

1,311,648. Patented July 29, 1919.

ATTORNEY UNITED STATES PATENT orrion- RICHARD M. HOPKINS, OF NEW YORK. N. Y., ASSIGNOR TO AMERICAN DISTRICT TELEGRAPH COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

RELAY.

Specification of Letters Patent. I Patented July 29, 1919.

Application filed June 15,1917. Serial No. 174,855.

and resident of the borough of Manhattan,"

city, county, .and State of New York, have invented certain new and useful Improvements in Relays, of which the following is a specification.

Myinvention relates to improvements in alternating current relays, and comprises a particular arrangement of front contact point, in connection with a spring-mounted armature, whereby vibration of such point against its corresponding stop is practically eliminated, and firm and good contact of such point with its stop assured. Thereby it is rendered possible to produce a simple alternating current relay, of a type closely approximating direct current relays of a standard type, and without the complications heretofore required to make alternatingr current relays eifective.

he object of my invention is toproduce an alternating current relay of simple character and of a type corresponding closely to the standard type of directcurrent relay, which shall be capable of producing good and firm contact between its front contact point and front stop, and shall be devoid of the buzzing efi'ect, commonly experienced heretofore when attempt has been made to use relays of substantially ordinary direct current character on alternating current circuits.

, I will now proceed to describe my inventionv with reference to the accompanying drawings, which illustrate one type of relay embodying my invention.

In said drawings:

Figure 1 shows a top view of my improved relay; Fig. 2 a side elevation thereof, and Fig. 3 a transverse section on the line 3-3 of Fig. 2.

designates the usual In the drawings: 1 (preferably lamibase, 2, 2 the magnet cores nated, as indicated) and 3, 3 the magnet spools.

4 designates the armature for the said magnets, provided with the usual upward extension 5 arranged to engage the usual back stop screw 6 carried by the usual yoke 7; but it is to be noted that this extension 5 does not engage any front stop. The arma- 'ture is supported, not by the usual trunnion but screws, by flexible strips 8 securely clamped to the armature l and also to a stationary support 9. For its front contact,

the armature is provided with an adjustable contact screw 10, located (1n the construction" shown) slightly above the point where the strips 8 are clamped to the armature -l, and arranged to make contact with a contact plece 11 carried, conveniently, by the lower portion of the yoke 7, The usual retractile spring 12 is provided.

It appears that when the armature is attracted by the magnet, it has, not merely an oscillatory movement (as it would have if mounted on trunnions) but a bodily movement toward the magnet poles; and, consequently, the contact screw 10 has a much greater amplitude of movement than if ,the armature were pivoted; permitting a relatively greater separation of the contact screw from its stop 11 on the backward movement of the armature than that; screw would have if located as shown and if-the armature were pivoted in the usual manner. It -is found that'said contact screw 10 makes a firm contact with its stop 11, upon forward movement of the armature, and that there is no noticeable buzzing effect; and when the armature is retracted ample separation of contact screw 10 from stop ll /is obtained. In fact, the relay operates, on alternating current, just as a direct current relay operates on direct current.

In some former alternating current relays two or more magnets have been employed, which are out of phase relatively. In this relay, no occasion is found for having the two magnets out of phase, and commonly they are in phase. The successful operation of the relay appears to be due to the springsupport of the armature, permitting bodily motion (as distinguished from oscillatory motion) of the armature toward and from the magnet, and to the location of the front contact screw close to the point of support of that armature by the supporting springs, and preferably between that point of support and the center of effort of the magnets on the armatnrel In terming the improved el'ectro-magnet1c instrument herein described a rclay, I use that term in a generic sense, inclusive also of sounders, and other apparatus actuated by, or employing, a magnet and moving armature. Firmness of contact. between an armature and its anvil is essential in a sounder,

in order that the sound oroduced may be characteristic, and of readable character.

0 'short flexible strips clamped to said base and to said armature, and contact points, one

carried by said armature and located between the point of attachment of said springs to said base and the center of efiort of the magnet on the armature, the other arranged to make contact with said first-mentioned contact point when the armature moves toward the magnet.

In testimony whereof I have signed this specification 'in the scribing witnesses; i

' RICHARD M. HOPKINS. Witnesses NELLIE I-IAIG,

ABIGA'HI; ,T. MGOLEAN. I

presence of two, sub-

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