US1776685A

US1776685A - Fuse plug

Info

Publication number: US1776685A
Application number: US380828A
Authority: US
Inventors: Ludwig Louis
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-07-25
Filing date: 1929-07-25
Publication date: 1930-09-23
Anticipated expiration: 1947-09-23

Description

Sept. 23, 1930. LUDMG I 1,776,685

FUSE PLUG Filed July 25, 1929 Elwventoz L au/s 1- udvw q Patented Sept. 23, 1930 UNITED STATES PATENT OFFICE FUSE Application filed July 25,

My invention relates to'fuse plugs of the type having an opening covered with transparent material through which the interior of the plug may be observed. It has for its 6 main object to provide an ordinary fuse plug with means which will positively indicate drawing of a preferred embodiment, but it will be understood that certain modifications might be made without departing from the scope of the invention; in the drawings Fig. 1 is a cross-sectional front view of a fuse plug containing my invention,

Fig. 2 is a cross-sectional side View, and

Fig. 3 is a top view.

Referring now to all the views, 1 is the ordinary porcelain body of a fuse plug, 2 the threaded metal ferrule, 3 the cap, 4 the opening in the cap through which the interior recess 5 of the body may be observed, and 6 the transparent mica disc usually covering this opening.

My invention consists in forming two diametrically opposite seats 7 and 8 in the top of the body member, to place a thin rod 9 in these seats so that it is suspended over the recess 5, and to pass the fusible metal strip 10 over the rod so that both will be located immediately under the mica disc 6. The ends of the fusible metal strip are soldered to the eyelet 11 and to the ferrule 2 in the usual manner. I prefer to decrease the width of the metal strip where it passes over the rod, as shown at 12, so as to cause the metal to fuse at this point.

It will readily be seen that with the fusible metal right against the mica disc it is easy to observe when the fuse is blown. However, to make it still more certain that this can be seen through the mica disc, I prefer to construct the rod 9 of glass or other easily shattered material and to color the rod in some prominent color which will appear as a. colored line across the mica disc. When glass or similar 59 material is used in the construction of the rod PLUG 1929. Serial No. 380,828.

the heat from the fusing of the metal strip causes the rod to be shattered, thus when the fuse is blown the colored line will have disappeared. v a

The foregoing will show that I have succeeded in providing extremely simple and inexpensive means for positively indicating the condition of a fuse plug. By employing variously colored rods the capacity of the fuses may be indicated. i 60 'Having described my invention and its object, what I claim as new and wish to protect by Letters Patent is:

1. In a fuse plug, an insulating body member having an interior recess covered with transparent material, a metal ferrule for securing the plug in a socket attached on the outside of said body member, a metal contact secured in the bottom of said body member, a fusible metal strip contained in the recess and connecting the ferrule with the contact, and a rod over which the fusible metal passes suspended in seats formed diametrically opposite each other at the top of the recess.

2. In a fuse plug, an insulating body member having an interior recess covered with transparent material, a metal ferrule for securing the plug in a socket attached on the outside of said body member, a metal contact secured in the bottom of said body member, a fusible metal. strip contained in the recess and connecting the ferrule with the contact, a supporting rod over which the fusible metal passes inserted in two seats formed at the top of the recess substantially opposite each other, and that part of the fusible metal which passes over the said rod decreased in size.

3. In a ,fuse plug, an insulating body member having an interior recess covered with transparent material, a metal ferrule secured on the outside of said body member, a metal contact secured in the bottom of the body member, a fusible metal strip contained in the recess and connecting the ferrule with the contact, and a supporting means made of glass over which the fusible metal passes secured across the top of the recess.

4. In a fuse plug, an insulating body member having an interior recess covered with transparent material, a metal ferrule secured on the outside of said body member, a metal contact secured in the bottom of the body member, a fusible metal strip contained in the 5 recess and connecting the ferrule With the contact, and a colored and easily shattered supporting member over Which the fusible metal passes secured near the top of the recess. o 10 5. In a fuse plug, an insulating body member having an interior'recess covered with transparent material, a metal ferrule secured on the outside of said body member, a metal contact secured in the bottom of the body member, a fusible metal strip contained in the recess and connecting the ferrule with the contact, and easily shattered supporting rod over Which thefusible metal passes secured across the top of the recess, and said rod colg0 ored to indicate the capacity of the fuse.

LOUIS LUDW'IG,