US2035743A - Circuit breaker - Google Patents

Description

,Maich 31, 1936. w. H. FRANK ET AL CIRCUIT BREAKER Filed March 29, 1934 INVENTORS wwwajmif BY t W A TORNEY,

Patented Mar. 31, 1936 PATENT OFFICE CIRCUIT BREAKER William 1!. Frank and Joseph Messing, Detroit, Mich, assignors to Bulldog Electric Products Company, Detroit, Mich, a. corporation of West Virginia Application March 29, 1934, Serial No. 717,989

12 Claims.

This application relates to circuit breakers, and discloses a novel holding means forv breaker trip pawls or levers, useful as a substitute for holding means of the character disclosed in Pat- 5 cut No. 1,982,289, November 27, 1934, Figs. 3-4.

Details of the constructions shown will be understood upon reference to the following detailed descriptive matter which relates to the appended drawing. In this drawing,

Figures 1 and 2 show holding means for a breaker pawl, in elevation and top plan view.

Figures 1 and 2 show novel holding means for breaker trip pawls or levers, useful as a substitute for a holding means like the one shown at 200-209, 2ll--2l3 of Patent No. 1,982,289, No-

vember 27, 1934, Figs. 3-4, to hold the end of a trip pawl or lever, like the end 88 of the pawl 81, pivotally mounted in the frame at 86.

On the base 66 is pivotally mounted at 2M a thermal warping element 282 urged toward the base by a coiled tension spring 283 connected in circuit through the pivot hinge at 28 l, or through a flexible jumper, and adapted to warp on overload to the right. Secured to and disposed transversely across and preferably insulated from the warping element is an E-shaped magnetic material piece 284 which, together with the magnetic material plate 285 mounted upon the pedestal 286, forms a magnetic circuit with the ther- 30 mal element 282 forming a single turn coil to provide the magnetomotive force.

A bracket 2M is rigidly secured to warping element 282 by rivets 262, there preferably being insulation 203 between the element and the brackets. An arm 204 is pivotally connected to bracket 2M by a pin ZOB-and is provided with a lock washer 206 which maintains arm 20; in any desired preset position, relative to the element. A pin 20! on the outer or free end of arm 204 rides freely in a circular slot 208 of a lever-latch 209 pivotally secured to a foot 2| l bya rivet M2 and thus mounted on the base 50. A hook M3 on the upper end of latch 209 holds the breaker pawl 81 firmly when the breaker is in the on position, or in its normal 0 position.

When an overload occurs, the warping element 282 moves to the right, due to thermal forces, or magnetic forces, or a combination of both forces. This motion is magnified by the leverage ratio 50 provided by the lever latch 209 moving the hook end 213 thereof to release the pawl 81.

Now having described an embodiment of the 5 invention.

mounted that it may move bodily in accordance with stresses exerted thereon by the magnet.

2. For use in a circuit protective breaker havl5 ing means normally tending to move parts into release condition when they are in reset condition and a pawl which when held prevents such action of the means, a holding means for said pawl including a circuit current controlled ther- 20 mally responsive element which deflects by warping on overload into pawl releasing position and is mounted to move bodily regardless of deflection, and a circuit current controlled magnet for moving the element bodily and instantaneously 25 I into pawl releasing position on an overload of suficient magnitude to operate the magnet.

3. For use in a. circuit protective breaker having means normally tending to move parts into release condition when they are in reset condi- 30 tion and a pawl which when held prevents such actionof the means, a. holding means for said pawl including a circuit current controlled thermally responsive element which deflects by warping on overload into pawl releasing position and 35 is mounted to move bodily regardless of deflection, and a circuit current controlled magnet for moving the element bodily and instantaneously into pawl releasing position on an overload of sufficient magnitude to operate the magnet, the 40 holding means also including a holding latch connected to the element by a movement amplifying connection and operating directly on the pawl.

4. In a circuit protective device, a circuit ourrent controlled delayed action holding element, and a magnet carried by and forming part of the element for causing instantaneous movement of the element on overload, the element being so mounted that it may move bodily in accordance with stresses exerted. thereon by the magnet, the element being an energizing source for the magnet.

5. A holding and releasing means for a circuit breaker part comprising a thermally responsive element, movement amplifying means positively connecting the element to the breaker part whereby overload warping or return cooling of the element will cause amplifled movement of the breaker part, the current in said element providing a magnetic force auxiliary to the thermal force for releasing the breaker, the element being mounted to move bodily regardless of deflection in accordance with magnetic forces created by the current flowing through it.

6. A holding and releasing means for a circuit I breaker part comprising a thermally responsive bimetal element, movement amplifying means positively connecting the element to the breaker part whereby overload warping or return cooling of the element will cause amplified movement of the breaker part, and means responsive to the current flowing in said element for creating a magnetic force which assists the thermal warping force for causing release movement of said element and thereby releasing the breaker, the element being mounted to move bodily regardless of deflection in accordance with magnetic forces created by the current flowing through it.

7. A holding and releasing means for a circuit breaker part comprising a circuit current controlled element constructed to deflect itself with a delayed action to release position on a circuit fault and to deflect itself automatically to holding position thereafter, and mounted on a pivot hinge so as to be movable bodily to and from release and holding position regardless of deflection, and means operating on a circuit fault and against an adjustable resistance for, causing instantaneous movement of the element bodily to release position.

8. A holding and releasing means for a circuit breaker part comprising a circuit current controlled element constructed to deflect itself with a delayed action to release position on a circuit fault and to deflect itself automatically to holding position thereafter,.and mounted on a pivot hinge so as to be movable bodily to and from release and holding position regardless of deflection, and means operating on a circuit fault for causing instantaneous movement of the element bodily to release position.

9. A holding and releasing means for aicir-' cult breaker D811; comprising a circuit current controlled element constructed to deflect itself with a delayed action to release position on a circuit fault and to deflect itself automatically sheaves to holding position thereaften-and mounted on a pivot hinge so as to be. movable bodily to and from release and holding position regardless of deflection, and magnetically actuating means operating on a circuit fault and against an amustable resistance for causing instantaneous movement of the element bodily to release position.

10. A holdlngand releasing meansfor a circuit breaker part comprising a circuit current controlled element constructed to deflect itself with a delayed action to release position on a circuit fault and to deflect itself automatically to holding position thereafter, and mounted on a pivot hinge so as to be movable bodily to and from release and holding position regardless of deflection, and magnetically actuating means operating on a circuit fault for causing instantaneous movement of the element bodily to release position.

11. Means for moving a circuit breaker holding part comprising a circuit current controlled element constructed to deflect itself with a delayed action to move the part into release position on a circuit fault and to deflect itself automatically to move the part into holding position thereafter, and mounted so as to be movable bodily to and from release and holding position regardless of deflection, and means operating on a circuit fault for causing instantaneous movement of the element bodily to release position, the element being positively connected to the part through a movement amplifying connection so that minute movements of the element will positively cause amplied movements of the part.

12. Means for moving a circuit breaker holding part comprising a circuit current controlled element constructed to deflect itself with a delayed action to move the part into release position on a, circuit fault and to deflect itself automatically to move the part into holding position thereafter, and mounted so as to be movable bodily to and from release and holding position,

- and circuit current controlled magnetically actuating means operating on a circuit fault for causing instantaneous movement of the element bodily to release position, the element being -positively connected to the part through a movement amplifying connection so that minute movements of the element will positively cause amplifled movements of the part. 1

JOSEPH MESSING.

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