Abstract: A locking device for a circuit breaker or electrical switch handle includes a support member having an opening conforming to the shape of the switch handle housing or escutcheon and a pair of spaced apart upstanding flanges projecting from the opening. A lock pin extends through openings in the respective flanges and through an aperture in the switch handle to prevent movement of the handle relative to the support member. An arm connected to one end of the pin may be secured to one of the flanges by the shackle of a padlock or the like to prevent removal of the pin from the support member and from the switch handle.

Abstract: A line current to time interpolator circuit senses the magnitude of current in a power distribution line and develops and AC voltage indicative of the current magnitude. The AC voltage is phase shifted multiple times to produce a number of phase shifted replica AC voltages, and the replica voltages are applied to a multiple input absolute value amplifier to develop a DC voltage indicative of the current magnitude. The DC voltage is applied to a ladder voltage comparator which controls the overall resistance of a discharge path coupled to a charged capacitor. The ladder comparator varies the discharge path resistance in inverse relationship to the DC voltage level to vary the discharge time constant of the capacitor. By controlling operation of a circuit interrupter in accordance with the charge level of the capacitor, the interpolator circuit provides a desired inverse time-current response characteristic.

Abstract: A fractional amp fuse (10) with a thin film fusible element (16) connecting thick film pads (14) supported by a polished insulating substrate (12). The fuse subassembly has leads (24) attached by resistance welding and is encapsulated in a ceramic insulating material (18). The entire fuse is enclosed in a plastic-like material (20).

Abstract: An improvement to an air logic circuit for an airfeed peck drill includes the insertion of a retract valve between the command valve and the air motor.

Abstract: A clip and process for its manufacture includes feeding a strip into a cutting and bending machine. The strip is formed into blanks such that one end of the blank has two prongs. The border of the area between the prongs on the first end matches the outline of the prong on the second end. The clip is then bent into a C-shape and the prongs are bent inwardly.

Abstract: A thermal barrier is interposed between a lampholder assembly and a plug box assembly in a track lighting fixture.

Abstract: A fluorescent lamp fixture having a troffer and a louver light diffuser includes meltable fasteners for attaching the louver light diffuser to the troffer. In the event of a fire, the meltable fasteners allow the louver light diffuser to fall free from the troffer.

Abstract: A method of bonding capacitor bushings (48) to tinned metal tank top covers (44) and tin plated terminal caps (42). A thick film ink is applied in two coats, the first coat (60) being high in binder and low in silver content and the second coat (62) being high in silver and low in binder, and fired. After burnishing, the bushing is soldered to the metal parts in a conventional manner.

Abstract: A rejection fuseholder (10) for Class CC fuses (30) having a leaf spring (22) to hold fuse (30) in contact with rejection contact assembly (14). Spacer (16) prevents fuses other than Class CC fuses from making electrical contact with rejection contact assembly (14). Assembly contact (14) is concave in shape and of a diameter greater than rejection nipple on fuse (30) so that electrical contact is made all around the circumference of rejection nipple of fuse (30) and centers fuse (30) in the contact.

Abstract: A luminaire adapted to be mounted on a pole structure and having a roll axis with respect to that structure, said luminaire consisting of a plurality of elements each of which has a center of gravity positioned in relation to each other so as to contribute to the center of gravity of the luminaire, when mounted, being below, with relation to direction of gravitational pull, a point on the roll axis of the luminaire.

Abstract: Apparatus for opening and closing a switch, which apparatus comprises a lever mounted on a frame for pivotal movement between a first position and a second position, a first spring biasing the lever from the second position to the first position, a cam and follower for effecting pivotal movement of the lever from the first position to the second position against the influence of the first spring, a step on the cam for permitting movement of the lever from the second position to the first position under the influence of the first spring after the lever has moved from the first position to the second position, a member adapted to be connected to the switch and movable between a switch opening position and a switch closing position, which member is movable to the switch closing position in response to movement of the lever from the second position to the first position, a second spring displaceable between extended and contracted conditions, which second spring is extended to the extended condition in response t

Abstract: An explosion-proof electrical conduit sealing fitting for threadedly engaging at least two threaded conduits and surrounding at least one conductor running through two threaded conduits includes a first element having a portion threadedly engaging at least one of at least two threaded conduits; a second element having a portion threadedly engaging at least one of the at least two threaded conduits, and connections for the first element and the second element. When properly connected and screwed into place, the sealing fitting of the present invention completely surrounds the at least one conductor and threadedly engages all of at least two threaded conduits.

Abstract: An interrupter (10) having an outer housing (62) adapted to contain an arc-extinguishing fluid, a fixed tubular electrical current carrying member (40) disposed at one end; a movable tubular current carrying member (30) disposed in an end-to-end relationship with the fixed electrical current member (40); a prime mover for stroking the movable current carrying member (30) between an open position and a closed position; a piston means (16), carried by the movable electrical current carrying member, for supplying pressurized fluid between two current carrying members when the interrupter is opened; an insulated plenum means (22), carried by the piston means (16) and disposed around the contacting ends of the two current carrying members, for confining the flow of pressurized arc-extinguishing fluid into the gap formed between the two current carrying members when the interrupter is opened so as to direct ionized fluid and arc by-products away from the interior surfaces of the outer enclosure and to shield the op

Abstract: A cylindrical coil electrode (10) incorporated in a vacuum interrupter comprises a cylindrical body (12) having an opening at one end thereof, three electrical connectors (16) provided between the edge surface (15) of the opening of the cylindrical body and a main electrode (11). A second cylindrical coil electrode having slits parallel to said first cylindrical coil electrode is mounted in an opposing manner. Because of the above structure, one-turn current flow throughout the current paths so that a uniform axial magnetic field is applied to the main electrode, and an arc current can be uniformly distributed over the entire surface of the main electrode, thereby improving the current interruption performance of the vacuum interrupter.

Abstract: A power-operated tool is fitted with a drive, whose driving shaft can, by means of a connecting coupling whose actuation depends on the reaction torque, be coupled with a driven shaft. The connecting coupling first interrupts transfer of the torque to the driven shaft, so that, in spite of the running drive, no torque can be transferred to the driving shaft. Immediately afterwards, the drive is disconnected. As a result of this sequence of disconnections, the motor, which continues running, can no longer have any influence on the work in progress so that the fastener being tightened does not reach the point of plastic deformation.

Abstract: A device for lifting metal plate or the like includes a substantially U-shaped housing which contains a toothless eccentric cam and a shackle. The toothless eccentric cam is mounted to the shackle by use of a connecting link and a radius link. The radius link is pivotably mounted to the housing so that when force is exerted on the shackle, a force is then exerted on the radius link which causes the connecting link to rotate the toothless eccentric cam into the throat of the housing.

Abstract: A current limiting assembly through which current may flow includes a stationary contact member, a movable contact member positioned in relation to the stationary contact member so that current flow through and from the stationary contact member into and through the movable contact member generates electromagnetic forces which create a repulsive force tending to force the movable contact member away from the stationary contact member, and a magnetic flux intensifying structure mechanically staked to said stationary contact member.