US1684060A - Magnetic switch - Google Patents

Description

Sept. 11, 1928.

H. D. JAMES MAGNETIC SWITCH Filed March 1, 1923 WITNESSES:

r Dwmes AT'TORNEY Patented Sept. 11, 1928.

UNITED-LSTATES PATENT OFFlCE.

Haunt 1). .mnnsyornnenwoon rABK, PENNSYLVANIA, ASSIGNOR ro WESTING- 'HOUSE'ELECIRIQ & MANUFACTURING COMPANY, A CORPORATION or PENNSYL- VAN IA.

MAGNETIC SWITCH.

-.- Application filed March 1, 1923. Serial No. 622,048.

; .iMy invention relates to control apparatus and it has-particularirelation to electromagtact members of a type similar to the main contactiimcmbers and-arranged for operation in circuits? parallel to; a circuit through the main contact members. They-switch structure is such that, when opening, the contact .member's-iarii successively separated and the circuitfinally interrupted in the lield of a magnetic blow-out device.

My invention will be described in connection with the accompanying drawing in which the single figure is a view, in side elevation, of apparatus embodying my invention.

A stationary electromagnet comprises a core 1 upon which is mounted a coil 2. A

frame 3 sup orts the core 1 and also a bearing, or shaii: 4;, upon which is pivotally mounted an armature member 5. A movable contact member 6 is pivotally mounted on a bearing 7 that is carried by the armature 5, the contact member 6 being biased toward a stationary contact member 8 by means of a spring 9. Arcing tips 11 and 12 are provided for the removable and stationary contact members 6 and 8, respectively. In the normal or inoperative position of armature a. stop member 13, which is carried by the armature, engages a boss 14 that is formed on a portion of the frame 3, and, in this (position, arcing tips 11 and 12 are separate An auxiliary shaft 15 is also carried by armature 5, the axis of this shaft being parallel to that of shaft 7. Movable contact members 16 and 17 are mounted on shaft 15 and are biased by means of a spring 18 toward a pair of stationary contact members 19 and 21, respectively. For convenience, the rotative movement of members 16 and 17 about the shaft 15 is restricted by means of stop pins 22 and 23.

In the open position of the contactor, movable contact members 16 and 17 are respectively disengaged from stationary members 19 and 21. During the opening movement of armature 5, the last named movable contact members are disengaged prior to the disengagement-of arcing tips 11 and-12. I he :contactor is providedwith a blow-out magnet having a coil 24 and pole-pieces 25 of familiar form. The apparatus :is bolted to an insulating base 26 and provided with current-carrying studs 27 and 28.

(urrent may be supplied throu h stud 2T. plow-out coil 24, stationary member 8, 'arcpug tips 12 and 11, a flexible shunt 29 and irame 3 to stud 28. Aparallel current path isprovided from stud 27 through contactmembers 19 and 16, flexible shunt 31, contact members 17 and 21 and frame 3 to stud Any number of pairs of'contact members may be mounted on shaft 15 on both sides of the armature 5 so that a number of parallel paths may be provided through the contacter. Shaft 15 is preferably located adjacent to the armature shaft 1 at such a distance that a minimum of power is required to operate the contactor. This arrangement is possible because a short break or opening is sufficient between the auxiliary contact members 16, 17, 19 and 21. The total current traversing the contactor is momentarily carried through arcing tips 11 and 12, when the contactor is being opened, and the are is ruptured between these tips. Y

It is apparent from an inspection of the drawing that all the contact-members are of a rolling type that is preferred for controlling circuits and apparatus of high-current capacity. The auxiliary contact members, since they are not required to interrupt a circuit but are only to maintain it, preferably have relatively small movements with respect to shafts l5 and 4. The contact members may, therefore, be actuated under very high contact-pressure, with correspondingly high-current capacity. \Vith an arrangement according to my invention, current is readily interrupted through a single pair of main switch members, and a single blow-out magnet only is required.

A contactor of the type herein described occupies less space than is necessary for known contactors of similar capacity and is arranged to require a relatively small operating magnet. My invention is described and illustrated in its preferred form but modifications may readily be made withoutdeparting from the spirit and scope thereof.

I claim as my invention:

1. A contactor comprising a movable and a stationary contact member and operating means therefor, a pair of oppositely-extendingi auxiliary stationary members, and a pair of auxiliary members pivotally mounted solely on the'movable member for bridging the auxiliary stationary members.

2. A c ontactor comprim'ng a stationary electro-magnet and an armature therefor, a shaft' carried by the armature, a contact member mounted for oscillatory movement on the-shaft, an auxiliary shaft carried by said armature in parallel relation to the first-named shaft, and apa'ir of contact members mounted solely on said auxiliary shaft to oscillate oppositely with respect to one another. 1

3. A eontactor comprising a stationary electro-magnet and an armature therefor, a

extending, contact members mounted solely on said auxiliary shaft and capable of different relative movements.

4. A contactor comprising a stationary electro-magnet. and an armature therefor, a shaft carried by the armature, a. contact member mounted for oscillatory movement on the shaft, an auxiliary shaft carried by said armature in parallel relation to the first-named shaft, a par of contact members mounted solely on said auxiliary shaft and a spring for biasing said pair of members oppositely.

5. A contactor comprising a plurality of stationary contact members, a pivotally mounted armature, and a plurality of oppositely-extending pivotally mounted contact members carried solely by the armature for successively engaging the respective stationary members.

In testimony whereof, I have hereunto subscribed my name this 16th day of February, 1923.

HENRY D. J AMEQ.

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