US769113A - Fuse-plug. - Google Patents

Description

PATENTED AUG. 30, 1904- H. R. SARGBNT.

FUSE PLUG.

APPLIGATIOH FILED MAR. 11, 1903.

N0 MODEL.

Fig.2.

MTNESSES Patented August 30, 1904.

UNITED STATES PATENT @FIFIQE.

HOWARD R. SARGENT, OF RUGBY, ENGLAND, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

FUSE-PLUG.

SPECIFICATION forming part of Letters Patent No. 769,113, dated August 30, 1904.

Application filed March 11, 1903. Serial No. 147,356 (No model.)

To all whom, it may concern:

Be it known that I, HOWARD R. SARGENT, a citizen of the United States, residing at Rugby, WVarwickshire, England, have invented certain new and useful Improvements in Fuse- Plugs, of which the following is aspecification.

The present invention relates to thermal cutouts, and more particularly to the fuse-plug type of cut-outs.

There are on the market at the present time two forms of fuse-plugs, one consisting of a base of porcelain or other molded insulating material having at one end a center and a side contact and a fuse soldered to the contacts, the other consisting of an inclosing carrier provided with pairs of inner and outer contacts and a movable or cartridge fuse carried thereby. WVhen the fuse proper of the for mer kind has become destroyed, the entire plug is thrown away or else a large supply is carried in reserve and the blown ones reshipped to the factory for renewal. WVith the latter kind of fuse-plug, which was originally designed to effect a saving in renewals over the former kind, the removable or cartridge fuse is usually thrown away when the fuse proper has become destroyed; but the original cost of the latter kind is somewhat greater than the former kind.

The object of my invention is to provide a highly-efiicient fuse-plug which may be manufactured and sold at substantially the same price as the ordinary cartric'lge-fuses are sold.

The invention will be more readily understood by reference to the accompanying drawings, forming a part of this specification, in which Figure 1 is a vertical axial section of a fuseplug and receptacle embodying one form of my invention, and Fig. 2 is a side elevation of the same.

The fuse-plug comprises a main shell A, consisting of a short section of fiber tubing or other insulating material having its ends closed by metallic caps 1 and 2, to the centers of which the fuse 3 is secured by soldering or other means. The upper cap 1 has its cylindrical part of a size to closely fit the exterior of the shell A and is held thereon by pins 4 or other suitable engaging means. The lower edge of cap 1 carries a flange 5, adapted to make contact with a terminal of the receptacle B. The lower cap 2 has its sides provided with screw-threads which are adapted to tightly engage internally with threads onthe lower end of the shell A and externally with a threaded contact-cup on the receptacle B. The outside of the upper cap 1 maybe provided with a covering 6, of fiber or other insulation, which is held in place by a suitable adhesive. The shell A may be filled with lime or other absorbent material 7.

The receptacle B is of porcelain or other suitable material and consists of a circular base portion 10 and central boss 11, extending upward therefrom and having a cylindrical cavity and two external recesses 12 and 13 on diametrically opposite sides, the former recess 12 being connected with the bottom of the central cavity in boss 11 through an aperture 1 1. A threaded contact-cup 15 is secured in the bottom of the cylindrical cavity by means of a conducting-strip 16, extending through the aperture 14 and a hole in the side of the cup 15 and held in place by a screw 17, extending through the center of the base portion 10 and engaging a tapped hole in the strip 16. The outer end of the strip 16 is provided with a binding-screw 18 for making contact with a main conductor-wire. The recess 13 receives a conductor-strip 19, extending from top to bottom of the boss portion 11 and held in position by a screw 21, extending through the base 10 and engaging a tapped hole in the strip. The lower end of the strip is provided with a binding-screw 20, and the upper end joins a contact-ring 22, resting in a slight recess at the top of the boss 11. It is apparent that the well-known Westinghouse or Thomson and Houston connection could be employed for holding the fuse-plug contacts in engagement with the contacts of the receptacle and that other changes might be made without departing from the spirit of the invention.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

l. The combination of a tubular shell of insulation, metal caps closing the ends of said shell, one ofWhich is provided With a screwthread and the other of which is partially covered by insulation, and a fuse passing through said shell and connected at its ends With said ca s.

The combination of a tubular shell of insulation, a metal cap for one end of said shell provided with a screw-thread, a metal cap for the other end provided With a contact-flange, and a fuse connected at its ends to said caps.

3. The combination of a tubular shell of insulation, a metal cap for one end of said shell provided With a screw-thread, a metal cap for the other end provided With a contact-flange and covered With insulation, and a fuse connected at its ends to said caps.

4E. The combination of a tubular shell of insulation, metal caps secured to the ends of said shell, one of said caps being provided With a screw-thread and the other of Which is partially covered by insulation, a fuse connect ing said caps, and an absorbent powder filling the unoccupied space Within said shell.

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