US750244A - Fuse for electric circuits - Google Patents

Description

PATENTE D JAN. 19, 1904.

E. C. PHILLIPS; FUSE FOR ELECTRIC CIRCUITS.

APPLICATION FILED JAN. 9, 1903.

10 MODEL.

I j/wood 4 u c v: Nonmi mans co worm mo WASHING) TN Patented January 19, 1904.

-UNITED STATES PATENT @FFIQE.

ELWOOD c. @PHILLIPS, or CHICAGO, ILLINOIS.

Fuse FOR ELECTRIC CIRCUITS.

SPECIFICATION forming ,part of Letters Patent No. 750,244, dated January 19, 1904.

Application, filed January 9, 1903 To all whon t it party concern:

Be it known that I, ELWooD C. PHILLIPs, a citizen of the United States of America, and a resident of Chicago, in-the county of Cook and State of Illinois, have invented certain new and useful Improvements in Fuses for Electric Circuits, of which the following is a specification.

The present invention relates to cut-out fuses employed in electric lighting and like circuits, and has for its object to provide a simple and efficient fuse-piece-and its surrounding plug adapting the same for ready application to an ordinary incandescent-lamp socket and affording means for the ready and convenient replacement of the fuse-piece when occasion requires and with which the formation of a sparking connection between the respective terminals is avoided in a simple and eflicient manner, all as will hereinafter more fully appear and be more particularly pointed out in the claim.

In the accompanying drawings, illustrative of the present invention, Figure 1 is a vertical sectional elevation at line a", Fig. 2, of the fuse-piece and its supporting-plug embodying the present improvements; Fig. 2, a plan view of the parts with the cap or cover piece removed; Fig. 3, a plan view of the fuse-piece in a detached condition.

Similar numerals of reference indicate like parts in the diflerent views.

Referring to the drawings, 1 represents a cylindrical insulating-base, of porcelain or other like insulating material, the outer surface of which is offset, as shown, and provided with upper and lower screw- threads 2 and 3 in separated relation and adapted for the independent attachment of the cap or cover and the conducting-sleeve, hereinafter described.

4 is a sleeve of metal spirally beaded, so as to form interior and exterior screw-threads, and adapted to screw upon the screw-threaded lower end of the base 1 as a permanent part thereof and constitute one of the contact-terminals of the present fuse-plug. Said sleeve 4: by means of its exterior screw-thread is adapted for ready engagement or attachment to the ordinary socket-piece in general use upon electric-lighting circuits by screwing Serial No. 138,394. (No model.)

into the correspondingly-formed bore of such socket-piece.

5 is a central metal plug fitted into an axial orifice of the base 1 to constitute the other terminal of the present fuse-block.

\Vith the described arrangement of the sleeve 4 and plug 5 a ready and convenient electrical connection can be had in the electric circuit to which it is intended to apply the present fuse, the exterior of the sleeve 4 contacting with a corresponding terminal or contact in the socket-piece aforesaid, while the plug 5 contacts with a corresponding terminal plug in such socket-piece.

6 is an annular cavity in the upper end of the fuse-base l and which is partitioned oil from a central cavity 7 in said base by an an nular wall or partition 8, as shown in Figs. 1 and 2.

9 is a horizontal clamp formed by two superimposed plate-shaped jaws which extend out radially from the central cavity 7 and through a side passage in the annular wall or partition 8, their outer ends adapted to engage one end of the curved fuse of the present invention. 1.0 is a clampingscrew passing through said plate-shaped jaws of the clamp 9 and adapted to clamp the jaws thereof firmly upon the curved fuse aforesaid.

11 is a central metal shank connecting the inner end of the clamp 9 with the plug 5 aforesaid, as shown in Fig. 1.

12 is a longitudinal clamp, also formed by two superimposed plate-shaped jaws,the lower one of which is connected by a vertical extension 13 with the sleeve i aforesaid. Such clamp is arranged within the annular cavity 6 aforesaid at substantially right angles to the aforesaid companion clamp and is adapted to engage the other end of the curved fuse of the present invention. 1 1 is a clamping-screw passing through said plate-shaped jaws of the clamp 12 and adapted to clamp the jaws thereof firmly upon the curved fuse aforesaid.

15 is a vertical groove in the vertical wall of the annular cavity 6, adapted to form a guide for the end of the movable jaw of the clamp 12, as shown, so as to maintain the same in proper relation with the fixed jaw of such clamp.

16 is the fuse-piece of the present invention, formed of an open ring or loop shape, as more particularly shown in Fig. 3, and which is adapted to afford a maximum length of fuse with a minimum diameter of the holding-plug therefor.

17 is an inclosing cap-piece, the lower end or skirt of which is formed with screw-threads and adapted to screw upon the upper end of the base 1 to form an inclosure for the parts arranged in the upper part of said base, as heretofore described.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

A device of the class described, comprising a cylindrical insulating-base having a metal sleeve on one end and having its opposite end diametrically enlarged, provided with a central cavity open on one side and an annular cavity surrounding the same and provided in its outer wall with a recess 15, a cap detachably secured on the enlarged end of the base and forming a closure therefor, a conductor 11 in a central bore of the base, having its inner end in the central cavity and its outer end forming an electrical terminal 5, clamp-plates connected to the inner end of the said conductor, having their inner ends disposed in the central cavity, said clamp-plates extend-

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