US961308A

US961308A - Electric cut-out.

Info

Publication number: US961308A
Application number: US55275910A
Authority: US
Inventors: Thomas E Murray
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-04-01
Filing date: 1910-04-01
Publication date: 1910-06-14
Anticipated expiration: 1927-06-14

Description

T. E. MURRAY. ELEGTRIU OUT-OUT. APPLICATION FILED APRJ, 1910.

m u m m 1 f 7 L a J v m a H w. R. Z22 "a my. Ll-

1 I I l I e A win mama o STATES ZATENT OFFICE.

*irnomas E. MURRAY; or NEW YORK, N. Y.

ELECTRIC cur-our.

' ToaZl wkom it-mg 1 Be it known that I, THOMAS E. MURRAY,

a citiaenof the United States, residing at New York, in the county of New York and v State of New York, have invented certain .new and useful Improvements in Electric Cut-Outs, of which the following is a specification.

-In- U. S. Letters Patent No. 905,905,

granted to me December 8, 1908, I have described an electric cut-out and holder, in which I have set fortha fuse case in arched form, having its ends constructed to enter recesses in the holder and containing an arched fuse extending between said ends, the space around the fuse and within the case being filled with suitable inert refractory I'naterial in'p'ulverized form. In said Letters Patent I have described the fuse case as made wholly of porcelain, or other refractory fictile i'nsulatin material, and I have found suchmateria excellently adapted for the glvlfipwe under all ordinary conditions. en, however, the fuse .is to be subjected to abnormally heavy currents, it is desirable to construct the case so as to withstand the disruptive effect incident in such circumstances to the blowing of the fuse, and also to surround the fuse strip at the blowing point with a body of solid refractory material designed to resist the immediate shock. My invention, therefore, consists in the construction of a cut-out in which I include both the fuse case and the fuse therein, as more particularly recited in the claims.

In the accompanying drawings Figure 1 a section on the hue a: m of Fig. 2. Fig. 2 is a section on the line '1 y of Fig. 1, the

cover and pulverized filling being removed.

Fi 3 is -a section on the hue z z of Fig. 1,

' --an Fig. 4 is a section on the line w w of of refractorg Fig, 1.

blmilar numbers of reference indicate like parts.

, minals, and extends upwardly throu h openings 7, 8, in the base, and has an arc ed portionabove said base extendin through an o ening 8'in a standard 9. T e portion 10 of the fuse strip which is within the open- Specification of Letters Patent.

Patented June 14, 1910.

application filed April 1, 1910. Serial No. 552,759.

ing is reduced in area so that the blowing of the fuse will occur within said opening, and the incident shock will therefore, in some measure, first come upon the solid body of the standard 9, before it is wholly transmitted to the refractory ulverized material 11 in which the fuse an standard are embedded.' The standard 9 and

projections

2 and 3 are preferably made integrally with the base, so that the whole forms a solid block of porcelain in which is provided the usual openin 12 for receiving the supporting bar giumbered 21 in my aforesaid patent), by means of which bar and suitable locking mechanism thecut-out, as described in said patent, is secured in place in the holder. The end edges of the base 1 are curved so that a semi-cylindrical cover 13 may fit over them. The sides of said cover rest against the fiat longitudinal edges of said base. The cover 13 is to be made of metal, preferably steel, and may be stamped or drop forged from a single piece, or constructed'in any other known way which will insure the maximum strength with proper lightness of weight. Said cover is secured in place by means of bolts 14, 15, passing through its sides and through the body of the base. If desired the cover may be provided internally with a lining of fiber or asbestos felting 16. In order to introduce the pulverized refractory material which forms the filling into the space included between the cover and the base, I provide recesses 17 in the ends of the base, through which, after the cover is in place, said filling may be inserted. These recesses are afterward filled with plaster, or like material, as shown at 18.

In operation, when the fuse is blown by reason of an abnormally heavy current, the shock comes upon the strong steel cover which cannot be disrupted thereby, nor can said cover be lifted off of the base because of its fastening bolts 14, 15.

I claim Y 1. The combination of a base of fictile refractory material, a' standard of like material thereon, a fuse having a portion of reduced cross sectional area disposed in an opening in said standard and secured at its ends in said base, and a cover secured on said base and inclosing said base and standard.

2. The combination of a base of fictile refractory material, a standard of like mate- 'rial thereon, an arched fuse extending side of sai through an opening in said standard and se cured at its ends in said base, a cover of metal secured on said base and inclosin said fuse and standard, and a.filling of pu verized refractory material within said cover.

3. The combination of a base of fictile refractory material, a standard of like material on one side thereof and integral therewith, integral projections on the op osite base, contact plates onlsai projections, a fuse connected at its ends to said projections and extending through an 0 en ing in said standard, a cover of meta secured on said base and inclosing said fuse cured at its ends in said base, a semi-cy- 1 lindrical cover formed inte rally of metal receiving said base and inc osin said fuse and standard, and a filling of pu verized refractory material within said cover.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

THOMAS E. MURRAY. lVitnesses:

GERTRUDE T. Pomona, MAY T. MOGARRY.