Metal working – Method of mechanical manufacture – Electrical device making
Patent
1977-02-07
1978-01-10
DiPalma, Victor A.
Metal working
Method of mechanical manufacture
Electrical device making
29DIG12, 29DIG15, 29417, 113116P, 113119, 337198, 337264, 337295, H01H 6902
Patent
active
040671038
ABSTRACT:
A method for making a plug-in fuse assembly like that disclosed and claimed in U.S. Pat. No. 3,909,767, granted Sept. 30, 1975 for Miniature Plug-In Fuse having different desired fuse ratings. The method comprises the steps of providing a strip of fuse metal which is initially preferably provided throughout its length with a continuous longitudinally extending portion of reduced thickness having a fixed thickness dimension and from which fuse link portions of fuse elements are to be stamped. Various selected areas of the strip, those which preferably are not the portions of reduced thickness and from which the terminal portions of the fuses are to be formed, are covered with a non-oxidizable conductive coating, preferably tin plating. The strip of fuse metal is then blanked to form longitudinally spaced still interconnected plug-in fuse element-forming sections each comprising spaced terminal blade portions and current-carrying extensions thereof formed from the thicker tin plated portions of the strip and a fuse link extending between said current-carrying extensions and formed from the unplated portions of the strip. The interconnecting un-plated fuse link portions of fixed reduced thickness dimension are arranged in desired locations and provided with desired configurations, including width and length dimensions, to provide the different desired fuse ratings. The method may include inserting over the end fuse-forming section of the strip either before or after it is severed from the strip a housing made of insulating material, with the current carrying extensions and the interconnecting fuse link portion of each plug-in fuse element within the housing and with the pair of terminal blade portions thereof extending outwardly from the housing.
REFERENCES:
patent: 1777916 (1930-10-01), Glossl
patent: 3707933 (1973-01-01), Berg
patent: 3775724 (1973-11-01), Mamrick
patent: 3909767 (1975-09-01), Williamson et al.
patent: 3962782 (1976-06-01), Williamson et al.
patent: 3967369 (1976-07-01), Takano
patent: 3990864 (1976-11-01), Rozmus
patent: 3995365 (1976-12-01), Repplinger
patent: 4023264 (1977-05-01), Schmidt, Jr. et al.
patent: 4023265 (1977-05-01), Aryamane
DiPalma Victor A.
Littelfuse Inc.
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