US2068569A

US2068569A - Circuit breaker

Info

Publication number: US2068569A
Application number: US15279A
Authority: US
Inventors: Rog John
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-04-08
Filing date: 1935-04-08
Publication date: 1937-01-19
Anticipated expiration: 1954-01-19

Description

J. ROG

CIRCUIT BREAKER Jan. 19, 1937.

` Filed April- 8v, 1935 LIC nvdr

INVENTOR. JHN P06.

ATTORNEY/ f f M N, mmmmmwwmm@ f wg? n t 2:92:11 A EEEEE u. w 1/1. ////////YH 4 Patented Jan. 19, 1937 UNITED STATES PATENT OFFICE l Claim.

This invention relates to that class of electrical devices which interrupt the iiow of current when too great a load is interposed in the circuit, known as fuses, which at a certain value of current and time rupture the circuit.

Fuses as commonly made require replacement after becoming blown or having served their purpose of causing cessation of current, and such replacement is usually inconvenient to accomplish under any condition and'particularly so in the dark; moreover, 4a substitute fuse is not always at hand.

It is therefore an object of the present in.- vention to provide a circuit breaker to be inserted in the circuit, that is instantly responsive to an excess of heat, caused by the current passing therethrough, and break the circuit, cutting ofi the current.

A further feature is in the provision of means within the circuit breaker Ifor reinstatingY the flow of current automatically after a momentary overload, entirely Without manual effort, this being self-resetting.

Another purpose is to produce an automatic resetting circuit breaker of neat appearance, inexpensive construction and capable of long extended service. v These advantageous objects are attained by the novel construction, combination and arrangement of few and simple parts hereinafter described and illustrated in the accompanying drawing; forming a material part of this disclosure, and in which;-

Figure l is a side elevational view ci an embodiment of the invention as assembled ready for use. f

Figure 2 is a partial side elevational, partial longitudinal sectional view of the same drawn to an enlarged scale.

Figure 3 is a longitudinal sectional View taken on line 3-3 of Figure 2.

Figure 4 isa transverse sectional view taken on line 4 4 of Figure 3, showing the circuit closed.

Figure 5 is a similar sectional View taken in the same plane, but showing the circuit breaker in an open position.

As shown in the drawing the device consists of a tubular casing I oi insulating material, as indurated ber, into the socket connecting end of which is set a sleeve li, having at its outer extremity a disc I2 of dielectric material provided at its outer face with a hub-like extension I3. The extending portion of the sleeve H has formed on it the usual standard screw thread (Cl. 20o-113) and is enveloped in a screw shell i4 of conducting material, provided with an inreaching annular ilange l by which the'disc i2 is tightly clamped against the end of the sleeve ll.

The upper edge of the shellmakes contact with the adjacent edge of the casing l0 and constitutes a plug adapted to engage a standard socket.

Fixed in an internal longitudinal groove il of the casing IB is a conductor strip i8 having its lower end i9 in electrical engagement with the shell i4 and at its opposite, outer end is a contact block 20, such as carbon, held rigidly to it by a bolt 2i, this block extending radially into the hollow casing l0 near its outer end.

Fixed on the outer side of the disc hub i3 is a button shaped conductive contact 22 having a stem 23 passing axially through the disc l2, and

formed on the stem is a thin, coiled bi-metallic` helix constituting a thermostatic coil 24, extendlng centrally into the casing I0 towards its outer end.

The upper end of the helix is inbent as at 25, and xed to a collar 26 firmly secured on an axial conductor rod 21 freely rotatable in the casing and extending from a point near the disc l2 to the outer end of the casing where it passes through a central opening in a disc 28 of dielectric material, such for instance, as mica.

The disc 28 acts as a cover for the casing I0 and is held in position therein by a spring retaining ring 29 set in an internal annular groove in the uppermost part of the casing.

Surrounding the rod 21 is a guard tube 30 and adjustably clamped to the rod, at a point beyond the tube, is an arm 3l on the end of which is mounted a carbon contact 3l' adapted to normally rest against the side face of the contact block 20.

, In operation the circuit breaker is entered into any ordinary socket, one pole of the current being conducted by the shell I4 to the block 20 by the conductor I8, while the other pole is conducted by contact 22 to the helix 24, rod 21, arm 3|, and carbon contact 3i', which is normally engaged with the block 20, thus forming a complete circuit.

Upon imposing an overload on the circuit heat is instantly generated, causing the coiled helix to expand and move the arm 3l from the block, see Figure 4, into a remote position, as seen in Figure 5, thus breaking the circuit.

The helix 24 quickly cools, re-establishing the circuit by closing the arm upon the block and conveying current therethrough.

Due to the plurality of coils in the helix it is the circuit, and obviously no labor or even attention is required.

Although the foregoing is descriptive of the preferred embodiment of the invention, it will be apparent that minor changes may be made in its construction. without departing from the scope of the claim hereto appended.

Having thus described the invention what is claimed as new and desired to secure by Letters Patent, isz- A circuit breaker plug comprising a dielectric tubular casing having a sleeve tight fitted in one end, a dielectric disc at the outer end of said sleeve, a screw threaded conductive shell enclosing the extending portion of said sleeve and instantly responsive both in making and breakingclamping said disc thereto, a strip conductor Fixed in said casing in electrical contact with said shell, a carbon block carried by said Conductor to extend radially into said casing, a Contact fixed centrally on said disc, a thermostatic helix in electrical engagement with said Contact, said helix extending axially into said casing, a .rod :xed on the extremity of said helix to pass axially therethrough, a guard tube on said rod, a contact arm supported and actuated by the outer portion of said rod to normall;r rest against said block and movable therefrom upon the imposition olf an overload in the circuit, anda transparent cover for said casing.

JOHN