US1788877A

US1788877A - Renewable fuse

Info

Publication number: US1788877A
Application number: US264140A
Authority: US
Inventors: Edward A Lawrence
Original assignee: GREAT WESTERN FUSE Co
Current assignee: GREAT WESTERN FUSE Co
Priority date: 1928-03-23
Filing date: 1928-03-23
Publication date: 1931-01-13
Anticipated expiration: 1948-01-13

Description

Jan. 13, 1931. E. A. LAWRENCE.

RENEWABLE FUSE Filed March 25, 1928 "yon? Patented Jan. 13, 1931 UNITED STATES PATENTOFFICE EDWARD A. LAWRENCE, OF BELLEVUE, PENNSYLVANIA, ASSIGNOR TO GREAT wEs'rEnN FUSE COMPANY, or PITTSBURGH, PENNSYLVANIA, A CORPORATION OF DELAWARE RENEWABLE first: i

Application filed March 28, 1928. Serial No. 264,140.

The objects which I have in view are as follows The provision of an efficient renewable'fuse of simple construction and inexpensive to manufacture.

The provision of a renewable fuse which may be quickly and conveniently assembled and disassembled without requiring skill or the use of special tools.

The provision of a renewable fuse whose ends are sealed against the outward passage of flames along the terminal blades.

Other objects will appear from the following description.

In the accompanying drawings, wherein I have illustrated the best embodiment of the principles of my invention now known 20 n e, Fig. 1 is a longitudinal section of the use.

Fig. 2 is an end View looking from the left in Fig. 1, and with the screw cap omitted.

Fig. 3 is an inner face view of the anchoring washer. I

Fig. 4: is an edge view of the same.

Fig. 5 is an outer end view of one of the ferrules.

Fig. 6 is a side elevation of one of the terminal blades which is provided with twin abutments. i

Fig. 7 is an edge view of the same. I

Fi 8 is an end view of the fuse withthe screw cap, the anchoring washer and the sealing disk removed and the terminal blade in position. i

Fig. 9 is an inner face ing washer. n

Fig. 10 is an edge view of the same.

Referring to the drawings, 1 indicates the tubular shell which is of insulating material, 40 such as fibre.

On each end of the. shell there is fixed a metal ferrule 2 secured in place as by threaded engagement and riveting. The ferrules are provided with recesses in their ends to form seats 3. The outer ends of the ferrules are exteriorly threaded to receive the annular caps 4.

The shell 1 and the ferrules 2 comprise the tubular body of the fuse. 50 5 and 6 indicate the two metal terminal of the slotted sealmetrically disposed slotted opening 15 which in place.

blades'whose reduced inner extremities are detachably connected to the ends of the fusible link 7.

One of the terminal blades 5 is provided with a fixed circular closure head 8 which engages and closes one end of the fuse body bearing against the outer end of the ferrule 2.

The head 8 is provided with a lug 9 on its inner face to engage the seat 3 and hold the i embracing the terminal blade and closing the end oft-he fuse body.

The washer 11- is provided with a lug 13 on its inner face at the closed end of the slot 12, which lug engages the seat 3 and holds the washer and terminal blade against rotation relative to the fuse body. V

14 represents the metal sealing disk which is circular and of substantially theisame diameter as the anchoring washer 11. Said disk is provided-with a closed ended symis of proper dimensions to permit the disk to be slippeddown over the terminal blade 6 to rest on the outer abutment 10.

The d sk 1st is. provided on its inner sur- "face with a lug 16 sodisposed that it enters theopen end of the washer slot 12 and blocks the same.

Theannular screw cap 4 is then screwed onto the ferrule clamping the disk 14 down into sealing engagement with the abutment and holding the assembled elements rigidly WVhon the fuse is to be assembled the two terminal blades are connected to the opposite .ends of the fusible link and the terminal blade 6 and the link 7 are inserted through the right end of the fuse body as shown in Fig. 1 until the closure head 8 seats on the end of the fuse body and its lug 9 engages the seat 3 in the corresponding ferrule 2.

The anchoring washer is then slid laterally in place between the two abutments 10 on the terminal blade 6 closing its adjacent end of the fuse body and its lug 13 engaging the seat 3 in the corresponding ferrule 2.

The sealing diskis now slipped down over the end of the terminal blade 6 against the outer abutment 10 with its lug l6 engaged in the slot 12 of the washer 11 and the cap 4 is screwed down snugly into place.

\Vhen it is desired to disassemble the fuse, the screw caps may be removed and also the anchoring washer and the sealing disk, thus releasing the parts.

It is evident from the foregoing description that the terminal blade is effectively sealed against the outward travel of flames along the same.

It is further evident that my improved renewable fuse is of simple and inexpensive construction; comprises relatively few parts, and that it may be assembled, disassembled and renewed by an unskilled person and without requiring tools.

\Vhat I desire to claim is 1. In a renewable fuse, the combination of a tubular fuse body, a terminal blade arranged to extend through the end thereof and having a pair of spaced apart abutments fixed on said blade, and both extendingoutwardly from the flat sides of the blade, an anchorage washer having a slot open at one end and arranged to be slid laterally between said abutments and embracing the blade and closing the end of the fuse body, said washer and fuse body having parts inter-engaging to prevent rotation of the washer relative to the body, a sealing disk having a closed ended slot and slipped down over the end of the terminal blade to rest on the outer abutment, the outer abutment being interposed between said Washer and said sealing disk, and the inner abutment overlapping and sealing the sides of the slot in the anchorage washer and means for clamping the parts to the end of the fuse body.

2. In a removable fuse, the combination of a tubular fuse body, a terminal blade arranged to extend through the end thereof and having a pair of spaced apart abutments, fixed on said blade, an'anchorage washer having a slot open at one end and arranged to be slid between said abutments and embracing the blade and olosin g the end of the fuse body, said washer and fuse body having parts interengaging to prevent the rotation of the wash er relative to the fuse body, a sealing disk having a closed ended slot and slipped down over the terminal blade to rest on the outer abutment, the outer abutment being interposed between said washer and said sealing disk, said disk having a portion engaged in the slot of said washer, and means for clamping the parts to the end of the fuse body.

3. In a renewable fuse, the combination of a tubular fuse body, a terminal blade arranged to extend through the end of said body, a pair of parallel abutments fixedly mounted on said blade, and a one-piece closure provided with an open ended slot for the end of the fuse body embracing said blade and engaged between said abutments, both of said abutments overlapping the sides of the slot in said closure to aid in sealing the same.

Signed at Pittsburgh, Pa., this 20th day of March, 1928.

EDWARD A. LAWRENCE.