Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1989-05-22
1991-05-21
Scott, J. R.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
174 521, 336 90, H05K 720, H01F 2700
Patent
active
050180495
ABSTRACT:
A housing for electronic switchgear comprises an outer sleeve made of metal, an inner sleeve positioned within the outer sleeve and being made of electrically insulating plastic that is impermeable to water, dust and other media in the ambient atmosphere, and a stopper of similar plastic. The inner sleeve is closed at one end and the stopper is inserted into the sleeve at its other end to sealingly close the sleeve. The inner sleeve consists of a first sleeve part open at both ends and a second sleeve part aligned with the first sleeve part and closed at one end. The other end of the second sleeve part is abutting upon one end of the first sleeve part. The stopper is sealingly inserted into the first sleeve part at its other end. The plastic of the first sleeve part is transparent or translucent whereas the plastic of said second sleeve part is not transparent or translucent, but otherwise identical or of equal grade. Both sleeve parts are bonded together with their abutting ends in a hermetically sealed and puncture-proof manner, in particular, by ultrasonic plastics welding. Preferably the first sleeve part is an extruded part, whereas the second sleeve part is an injection molded part.
REFERENCES:
patent: 4225748 (1980-09-01), Buck et al.
patent: 4419646 (1983-12-01), Hermle
patent: 4785240 (1988-11-01), Newell et al.
IFM Electronic GmbH
Scott J. R.
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