Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1993-11-23
1996-03-05
Hoang, Tu
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
361117, H01C 710
Patent
active
054971381
ABSTRACT:
A method of manufacturing a surge arrestor, comprising the following steps: making a stack of varistors and forming a first envelope that is at least semi-rigid thereon and that has an outside section that is constant along its length, thereby serving in particular to compensate for surface irregularities in the stack of varistors due to alignment faults and to dimensional dispersions in the varistors, after which an outer envelope of substantially constant thickness is extruded on the first envelope, and then annular fins are installed on the extruded outer envelope. A surge arrestor, comprising a stack of varistors, a first envelope surrounding the stack of varistors that is at least semi-rigid thereon and that has an outside section that is constant along its length, thereby serving in particular to compensate for surface irregularities in the stack of varistors due to alignment faults and to dimensional dispersions in the varistors, an outer envelope of substantially constant thickness extruded on the first envelope, and annular fins installed on the extruded outer envelope.
REFERENCES:
patent: 1497978 (1924-06-01), Jacobs
patent: 2276732 (1942-03-01), Ludwig et al.
patent: 3227983 (1966-01-01), Braun
patent: 4825188 (1989-04-01), Parraud et al.
patent: 4833438 (1989-05-01), Parraud et al.
patent: 4853670 (1989-08-01), Stengard
patent: 4940961 (1990-07-01), Thuries et al.
Malpiece Fre/ de/ ric
Mercier Dominique
Rousseau Alain
Hoang Tu
Soule
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