US1443261A - Fuse plug - Google Patents

Description

J an. 23, 1923.

WITNESSES W. F. HEINS ET AL.

FUSE PLUG.

ORIGINAL FILED JULYII. 1919.

INVENT'ORS 7Z Iii/115 ia/0112i? A TTORNE Y8 Patented Jan. 23, 192 3.

UNITED STATES 1,443,261 PATENT OFFICE.

wiLLiAM r. HEINS AND JOHN news, or ALBANY, NEW YORK.

'rusn PLUG.

Application filed July 11, 1919, Serial No. 310,053. Renewed November 23, 1822.

To all whom it may concern:

Be it known that we, WILLIAM F. HEINS and JOHN Hams, both citizens of the United States, and residents of Alban in the county of Albany and State of ew York, have invented a new and Improved Fuse Plug, of which'the following is a full, clear, and exact description.

This invention relates to fuse plugs and- A still further object of the invention is to provide a fuse plug with a removable hollow porcelain which presents a blow-out chamber.

Another object is to formthe plugin such a manner as to cause the burnt gases to slowly ooze out therefrom whenever the a fuse blows.

In the accompanying drawing:

Figure 1 is a side view of a fuse plug disclosing an embodiment of the invention, certain parts being broken away for better dis closing the invention.

Figure 2 is a section through Figure 1 on line 2-2. 1

Figure 3 is a top plan view of the plug' shown in Figure 1.

'Figure 4 is a detail perspective View on an enlarged scale of the fuse and contact coacting therewith, the same embodying certain features of the invention.

Figure 5 is a sectional view through Figure 2 on line 5-5. I

Referring to the accompanying drawing bygnumerals, 1 indicates a body prefer-ably formed of porcelain. This body is constructed with a chamber or recess 2 open at one end and with threads 3 for receiving the threaded sleeve or shell 4. Shell 4 is secured'to the depending flange 5 of the fibre cap 6 by any desired means, as for instance by spurs extending from the sleeve into the flange 5. As seen in Figure 2 the cap 6 is provided with a central opening 7 normallyclosed by a sheet of mica 8 resting against the shoulder 9 of cap 6. When the body 1 is screwed into place in the shell 4 the end thereof firmly clasps or presses the mica 8 against shoulder 9. This forms a substantially gas tight joint at-this point,

but the gas may slowly escape through a number of comparatively small openings 10 in the body 1, to the groove 11 and from thence along the outer surface'of'the body toward the closed end 12 of the body until, it finally passes beyond flange 5. A small opening 13 in shell 1 and a small notch or cut-out portion 13' in flange 5 act as guiding channels for the gas as it leaves the groove 11. I

In the closed end. 12 of body 1 is provided a square hole for receiving the contact member 14 which contact member is shown in detail in Fi ure'4. This contact member is formed wit a contact 15 riveted or otherwise rigidly secured to a springclasp or gripping member 16. This clasp is bent so as to roduce facing hooks 17 and 18. These hoo s are formed of resilient material and are positioned normally so that the ends will be slightly spaced apart. However, when the clasp 16 is forced into position, as shown in Figure 2, the hooks 17 and 18 will be forced together and will consequently firmly grip the fuse 20 positioned therebetween near the hook end 19. It is, of course, understood that the fuse may be of any size, capacity or shape without departing from the invention.

In operation, to assemble the plug the fuse 20 is bent for producing .the hook 19 after which it is slip ed into position 'as shown in Figure 4. The contact member with the fuse is then forced in the square opening in closed end 12 of body 1 until it reaches the position shown in igure 2. The free end of-the fuse is then bent over the edge of the body 1 until it overlaps one or more of the threads 3, the fuse extending through a suitable notch 21 in body 1. After the fuse has been thus properly ositioned the shell 4- is screwed down over t e body 1 until the open end of the body is pressing the mica window 8 tightly against the shoulder 9 of the cap 6. The plug is then ready for use and may be screwed in a socket in the usual manner whenever desired. During the ordinary use of the plug air freely passes through the openin 13, cut-out portion 13', groove 11 and oles 10 into chamber 2. However, when there is a sufiicient overload placed on the line the fuse 20 will burn or blow and the gases will pass out in a reverse direction to the passage of the air into chamber 2. ,After the fuse has burned out and itis desired to renew the same, the body 1 is unscrewed and the parts cleaned. By a slight pressureon' the clasp 16 from within chamber 2 the entire contactmember 14 will become removed whereupon a new fuse may be placed in position and the parts re-assembled. The operation of taking the plug out, placing the fuse in position and the re-assembling of the parts requires no tools as this operation may be done better and more expeditiously by the handsfof the operator.

What we claim is: v

1. In a fuse plug of the character described, a hollow body having air and gas openings adjacent one end'merging into a groove, a shell having an opening registeringwith said air and gas openings, a cap for the shell having a notch registering with the opening in said shell, said notch extending to a point exteriorly of the plug. a contact member carried by said body, and a fus'ein said hollow body engaging said contact member and said shell.

2. In a fuse plug of thecharacter described, a body having a closed end formed with a square aperture merging into a chamber, and a threaded exterior, a removable contact member formed with resilient, slightly diverging fuse receiving hooks, said. hooks being of such a size and so positioned as to be pressed together when forced into said square aperture for gripping a fuse having one end extending between said hooks, a fuse member having one end grasped by said hooks and the opposite end overlapping some of the threads on said body, said. fuse member extending through 3. In a fuse plug inseam said chamber, a shell screwed over said body on said threads, and an insulating cap carried by said shell, said cap covering one end of. said body. i

of the character described, a body formed with a closed end andan open end, a pair of spring gripping contact members arranged in said closed end, a cap carried by said open end, a fuse formed with a hook at each end, one of said hook ends being engaged by one of said con tacts and the hook thereof acting to prevent accidental displacement by pulling, the oppositeendvofsaid fuse having the hook part overlap said body and a metallic sleeve threaded onto said body, and frictionally engaging said last-mentioned hook end whereby the fuse is locked at both ends against accidental displacement.

4. In a fuse plug of the character de- -scribed,a bodyhaving a closed end and an open end, said open end having a radially extending aperture therein and also an exteriorly positioned groove merging into said aperture, said groove extending partly around the body, a metallic sleeve carried by said body exteriorly thereof, a contact member carried by said closed end, a fuse connecting said contact member with said sleeve, said sleeve having an opening therein adapted to register with said groove and a cap fitted onto said body at the open end formed with a. groove registering with the groove in the sleeve, said groove and said cap extending toward the closed end of the plug so as to discharge the gas in a direction away from the open end of the body.

WILLIAM F; HEINS. JOHN HEINS.

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