Abstract: An improved viewing window construction for an electrical disconnect switch 10. The improved construction of the viewing window 70 permits easier installation of the viewing window 70 while at the same time reducing the complexity of the switch cover manufacturing process, eliminating the need for a window retainer 46 and increasing the resistance to the ingress of water when subjected to a stream of water under pressure.

Abstract: An electrical apparatus housing having a door for accessing the apparatus within the interior of the housing and a switch for activating the apparatus accessible from the exterior of the housing. When in the on position, the switch is operable to block the door from being opened; thus functioning as an interlock to prevent access to the interior of the housing when the apparatus is activated. The invention includes a key for bypassing the interlock so that under certain circumstances the housing door can be opened while the equipment is operating, so it can be tested in its energized state.

Abstract: Upper and lower compartments are provided in metal-clad switchgear that are mirror images of each other. The compartments have doors that move toward one another to lock. The upper compartment has rails at the bottom for receiving a fuse truck, and the lower compartment has a division sheet between the compartment that has openings in it for receiving mating projections on the doors.

Abstract: An improved assembly (10) for housing electronics for remote reading of meter reading data in a subsurface enclosure (11) includes a first inner enclosure (40) of metal for housing the receiver/transmitter circuitry (90), a second inner enclosure (69, 86) for housing a battery (65) and an outer enclosure (24) of plastic which encloses both of the inner enclosures and additionally provides a sealed compartment for an antenna (50).

Abstract: An enclosure for a circuit breaker includes a housing sized to support at least one circuit breaker and to permit electrical connections to be made to the circuit breaker. A housing cover or lid is movable between an open position in which the circuit breaker is accessible and a closed position in which access to the electrical connections of the circuit breaker is prevented. An actuating bar is mounted slidably to the lid, and includes a switch-engaging formation for engaging the operating lever of the circuit breaker. The actuating bar includes a switch-engaging formation for engaging the operating lever of the circuit breaker and is operable to move the operating lever between the first, active position and a second, inactive position. An interlocking formation in the form of a waisted portion defined in the bar is adapted to prevent opening of the cover when the switch operating lever is in the first position and to allow opening of the cover when the operating lever is in the second position.

Abstract: An electronic device using an operation battery and a memory backup battery includes a device body and a memory backup battery removal preventing mechanism. The device body includes a first accommodating portion for accommodating therein the operation battery and a second accommodating portion for accommodating therein the memory backup battery. The preventing mechanism prevents the memory backup battery accommodated in the second accommodating portion from being removed from the second accommodating portion based on whether or not the operation battery is accommodated in the first accommodating portion.

Abstract: A portable information processing apparatus includes a housing storing electronic components. The housing includes first to third card storage portions having insertion ports open to one side surface of the housing, respectively, for card-like electronic components. A first cover is provided on the housing and rotatable between a closed position wherein the insertion port of the first card storage portion is closed by the first cover and an opened position wherein the insertion port of the first card storage portion open. A second cover is provided on the housing to be movable between a closed position wherein the first cover located in the closed position and the insertion ports of the second and third card storage portions are covered with the second cover and an opened position wherein the first cover and the insertion ports of the second and third card storage portions are exposed.

Abstract: A safety lock-out device prevents the insertion of an electrical power cord into an electrical power cord receptacle of an electrical appliance. The devise comprises a mounting plate fastened to the appliance and a cover plate hingedly attached to the appliance. The cover plate is movable between a first position and a second position such that, in the first position, the cover plate covers and prevents insertion of a power cord into the appliance receptacle. In said second position, the appliance receptacle is uncovered to permit insertion of a power cord into the receptacle. Extending a lock shank through aligned openings formed in flange members extending from the mounting plate and the cover plate locks the cover plate in the first position.

Abstract: The switch cabinet (50) exhibits a housing, which is provided with a door and which includes a box-shaped switch (1). The switch (1) can be brought by a pushing movement inside the switch cabinet (50) into a connected position or into a disconnected position, and exhibits a fixed part (2) mounted in the switch cabinet housing, and a movable housing body (3) which interacts with the fixed part (2) and can be removed from the housing. Furthermore, the switch (1) contains a disconnecting device for achieving the disconnected position or the connected position, and a switching lever (4) guided to the outside through a first opening (6) provided in the door (7). Provided in the door (7) of the switch cabinet housing is a second opening (11) which serves to guide through a tool (8) which facilitates the operation of the disconnecting device with the door (7) closed.This switch cabinet fulfills particularly strict safety requirements.

Abstract: The present invention is for use with high-tension electrical switchgear enclosed within a cabinet. The output shaft of a spring operating mechanism mounted on the exterior of the main safety door extends through the door and is connected to a bell crank. As the shaft rotates the bell crank, it imparts force to a first substantially vertical push rod which in turn imparts force to a second bell crank. An arm of the second bell crank imparts force to a second push rod which is connected to a lever arm that is connected to the operating shaft of the electrical switch, thereby opening or closing the switch. The first push rod has ball joints at both ends and a free twisting joint along the rod, thereby allowing opening of the door without disconnecting the operating mechanism. A push rod connected to the first bell crank engages a lip affixed to the cabinet wall to prevent opening of the door when the switch is closed.

Abstract: High voltage motor contactors and associated equipment are arranged within upper and lower compartments that are interlocked with the external operator handle to prevent access when the contactors are electrically energized. Low voltage devices used in association with the contactors to provide total motor control function are housed within upper and lower cabinets arranged on the upper and lower compartment doors. An interlock defeat assembly is mounted within the low voltage cabinets to allow emergency access to the compartments while the contactors are still energized.

Abstract: A safety interlock for an overhead projector utilizes only one electrical switch to provide the functions of both a conventional power switch and a safety interlock switch. In an operational mode, the switch responds to a cam surface for actuation. In a safety interlock mode, the switch is allowed to rotate in response to forces generated by the cam surface rather than being actuated.

Abstract: A rigid insulating shield has tabs at a lower end inserted in slots in a case and a press-in fastener at an upper end inserted within a hole in a switch base assembly for securing said shield within the case. A handle pullout has a large flange extending over the shield when inserted in the switch base assembly to prevent removal or displacement of the shield while the handle pullout is inserted in an ON position of the switch. The flange is sufficiently large to block direct access to termination means on the switch base assembly when the shield is removed and the handle pullout is inserted in the switch ON position.

Abstract: A motor control system includes a single, multicompartment enclosure mounted on a skid. The enclosure contains a transformer circuit and a motor controller circuit interconnected so that only external connections to a power source and a load are needed. When the circuits are energized, access to high voltage motor control components and to field replaceable fuses and output selection switches is prevented by a double interlocking mechanism which operates in conjunction with energizing and de-energizing the transformer. The transformer of the transformer circuit includes a tertiary winding disposed radially between a primary winding and a secondary winding. The winding filters electrostatically coupled transients. A conventional electrostatic shield is also used so that the transformer is doubly shielded to electrostatic transients. The tertiary winding is connected to one or more capacitors to filter magnetically coupled transients.