US761748A - Circuit-breaker. - Google Patents

Description

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UNITED STATES Patented June '7, 1904:.

PATENT OFFICE.

JOHN R. ANDERSON, JR., OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO STANLEY ELECTRIC MANUFACTURING COMPANY, OF PITTSFIELD, MASSACHUSETTS, CORPORATION OF NEIV JERSEY.

CIRCUIT-BREAKER.

SPECIFICATION forming part of Letters Patent N0. 761,748, dated June '7, 1904.

Application filed September 12, 1903. Serial No. 172,869. (No model.)

To all whom it may concern.-

Be it known that I, J OHN R. ANDnRsoN. Jr. a citizen of the United States, and a resident of Pittsfield, Massachusetts, have invented certain new and useful Improvements in Circuit-Breakers, of which the following is a specification.

My invention relates to breakers for electric circuits, and particularly to the tripping devices for such breakers.

The object of my invention is to provide a trippingdevice and a means of adjustment therefor which shall be more simple and eco' nomical in construction and which shall permit a liner and more even adjustment throughout the entire range of the breaker than has been possible in former constructions.

In the accompanying drawings, Figure 1 shows a side view of a circuit-breaker provided with a tripping device constructed in accordancewith my invention. Fig. 2 shows a front view of the setting device. Fig. 3 shows a plan View of the guide for the solenoid-core.

In the drawings, A represents a switch, which when closed is adapted to connect contacts a (0. Switch A is pivoted at Z)- B is a spring which tends to throw the switch A out of engagement with its contacts. Switch A isnormally held closed by catch C, which is engaged by the catch D, pivoted at (Z. Catch D is held in engagement with catch C, either by gravity, as shown in the drawings, or by any suitable method, such as a spring.

E represents a solenoid, which in the drawings is shown connected in series with one of the contacts a a.

F is the core or plunger for the solenoid,

carrying the rod f, which is adapted to strike catch D when core F is drawn up, and thus to release switch A.

Gr represents a guide for the core is supported by screws 9 g.

I represents a shaft on the end of which is carried the cam J. CamJ supports the weight of core F.

K is an index dial or plate carried by shaft I.

76 is an index-point for dial K.

L is a milled head carried by shaft I, by means of which the cam J and the plate K may be set. By turning head L camJ is revolved so as to raise or lower core F, thereby varying the number of amperes at which the core F will be drawn up by solenoid E. The amperes at which the breaker will open for the different settings of cam J are indicated on plate K, as shown in Fig. 2. It is evident that the cam J may be shaped on acurve corresponding to the pull of the solenoid on the core in its different positions. By this means an even spacing of the index-marks on plate K may be obtained, thus permitting a finer adjustment throughout the range of the breaker than is possible in ordinary constructions.

Although I have shown my setting device applied to a particular form of circuit-breaker, it will be understood that my invention is in no way limited to any particular type, but may be used with any well-known form of circuit-breaker. Accordingly I do not desire to limit myself to the particular construction and arrangement of parts here shown, since changes therein which do not depart from the spirit of my invention and which are within the scope of the appended claims will be obvious to those skilled in the art.

Having thus fully described my invention, I claim as new and desire to protect by Letters Patent 1. In a circuit-breaker, a trip-magnet, a movable trip-armature, a device for indicating the setting of said armature, and means intermediate to said device and the armature adapted to vary the pull of said magnet upon said armature by equal amounts in accordance with equal movements of said indicating device.

2. In a circuit-breaker, a trip-magnet, a movable trip-armature, and a setting device for said armature adapted to vary the pull of said magnet on said armature by equal amounts in accordance with equal angular movements of said setting device.

10 erated by the movement of said core, a shaft,

a cam carried by said shaft and supporting said core, and an index device carried by said shaft, said cam being so shaped that the units of said index device are of equal length.

Signed at Pittslield, Massachusetts, this 8th I 5 day of September, 1903.

JOHN R. ANDERSON, JR. itnesses:

L. A. HAWKINs, M. H. JONES.

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