Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1985-09-05
1987-06-02
Grimley, Arthur T.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
52 794, 521696, 220 4R, H05K 504, E04H 916
Patent
active
046706232
ABSTRACT:
A pressurized cabin for temporary or permanent confinement of electrical equipment in mines has one or more octagonal units and two sidewalls flanking the unit or units. Each unit is assembled of four sections each having a longer panel and a shorter panel, as considered in the circumferential direction of the respective unit, and the two panels of each section make an acute angle. The marginal portions of all sections are provided with borders which extend into the interior of the respective unit and are secured to each other, to the neighboring units and/or to the sidewalls by screws or bolts and nuts. Two of the longer panels in each unit are horizontal and the other two longer panels are vertical. The shorter panels have openings for the passage of pneumatic or hydraulic conduits and/or one or more electric cables. Such shorter panels can carry pressure relief and/or pressure reducing valves, or they can be connected to columns which mount the respective unit of a platform. The conduits or cables pass through plate-like closures which are sealingly secured to and overlie the openings in some or all of the shorter panels in a single unit or in each of two or more units.
REFERENCES:
patent: 3168777 (1965-02-01), DeRidder et al.
patent: 3972437 (1976-08-01), Lovich et al.
Grimley Arthur T.
Kontler Peter K.
Tone D. A.
Walter Becker GmbH
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