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Assignee: Service Machine Company


Location: Huntington, WV
No. of patents: 11

NumberTitleIssue Date
5381321Luminaire for hazardous atmospheres and explosion proof enclosure for power supply therefor
A luminaire comprises a transparent enclosure tube, a cylindrical handle housing at one end of the tube, and a cylindrical cap housing at the opposite end of the tube. A light carriage within the tube comprises a unitary subassembly consisting of a rigid ...
01/10/1995
5077628Circuit breaker protection apparatus
This invention prevents a circuit breaker from being re-set for a time sufficient to insure safe dissipation of ionized gases. Current monitors and rectifiers generate a reduced voltage direct current output which is fed into an auxiliary rectifier circui...
12/31/1991
5065142Voltage pickup circuit and flashing display for high voltage indicator device, and input electrode therefor
Safety apparatus for indicating a live alternating current voltage condition in an insulated electrical conductor having a central conductor wire comprises: an electrically conductive external sheath extending along a predetermined length of the insulatio...
11/12/1991
5051733High voltage indicator device
Safety apparatus for indicating a live voltage condition in an insulated electrical conductor having insulation surrounding a central conductor wire, comprises: a layer of semi-conducting tape on the outer surface of the insulation; an electrically conduc...
09/24/1991
4894497High temperature pressure switch assembly for use with explosion-proof enclosures
A high temperature pressure switch assembly for an explosion-proof enclosure used in hazardous atmospheres comprises an electrical control switch for a remote power source supplying electrical power to the enclosure, and a pressure responsive member which...
01/16/1990
4737603Isolation switch
An isolation switch comprises a mounting plate with a hub adapted to extend forwardly through a wall of an explosion-proof enclosure. A shaft is journaled for axial movement in the hub. First and second stationary contact members are supported on the moun...
04/12/1988
4665466Low headroom ventilating apparatus for cooling an electrical enclosure
Apparatus for cooling an electrical enclosure for use where headroom is limited. An imperforate top wall and a perforate ceiling wall below it define an exhaust compartment. The ceiling wall has openings above natural hot spots on heat-producing electrica...
05/12/1987
4639558Reversing switch
A reversing switch comprises a mounting plate assembly with a hub extending forwardly through a wall of an explosion proof enclosure. A shaft is journaled for rotational and axial movement in the hub. A stationary contact assembly includes four circumfere...
01/27/1987
4574943Control system for booster type belt conveyor
A control system for a booster type belt conveyor having one or more booster belts spaced at intervals along a conveyor belt with the upper, driving run of each booster belt frictionally engaging the underside of the conveyor belt carrying run. Each belt ...
03/11/1986
4563549Reversing switch
A reversing switch comprises a mounting plate assembly with a hub adapted to extend forwardly through a wall of an explosion proof enclosure. A shaft is journaled for both rotational and axial movement in the hub. A stationary contact assembly consists of...
01/07/1986
4484690Flame arresting ventilated wall for an explosion-proof enclosure
A flame arresting ventilated wall or panel for an explosion-proof enclosure comprises a stack of aluminum sheets apertured to provide a plurality of discrete, generally parallel gas flow channels disposed in crisscross patterns across the heights and widt...
11/27/1984
 
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