Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1984-07-23
1986-01-14
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337279, H01H 8514
Patent
active
045648301
ABSTRACT:
An expulsion type fuse cutout fuseholder structural assembly (10) including a fuse tube assembly (12) having a bone fiber liner (40) and a sleeve insert (36) coaxially disposed entirely interiorly within an insulative outer covering or wrapping (14). A rabbet joint is defined between the mated ends of the liner (40) and sleeve insert (36) by means of a counterbored portion (48) of the liner (40) and an axially projecting tubular portion (44) of the sleeve insert (36). In addition, each of the bone fiber liner (40) and sleeve insert (36) components is provided with a spiral groove (42,38) within which the inner layers of the outer covering or wrapping (14) are disposed during the wrapping fabrication of the fuse tube assembly (12). In this manner, all three structural components of the fuse tube assembly (12), that is, the sleeve (36), the liner (40), and the outer covering or wrapping (14), are all integrally interconnected together, whereby any one of the components is fixedly interconnected with the other two components. Such an improved structural assembly (12) enhances the interruption rating of the fuse cutout fuseholder structural assembly (10), in view of the fact that the structural integrity of the fuse tube assembly (12) is able to be maintained under the high-temperature, pressurized gaseous conditions attendant current fault conditions.
REFERENCES:
patent: 2325416 (1943-07-01), McMahon
patent: 2343422 (1944-03-01), Rawlings
patent: 3374329 (1968-03-01), Bronikowski
Marek James R.
Warner Dean C.
Blish Nelson A.
Broome Harold
Cooper Industries Inc.
Scott Eddie E.
Thiele Alan R.
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