Abstract:
A foot control of the treadle operated type has a latching mechanism which normally latches the treadle in an inoperative position and which must be released before the treadle can be moved to an operative position. The latch mechanism includes a latch plate which, as the latch mechanism is being set to latch the treadle in its inoperative position, is moved to a restricting position wherein it restricts access to the treadle by the foot of an operator or by a foreign object. The latch plate is yieldably constrained to restricting position after the latch mechanism is set, and must be moved out of its restricting position to re-establish free access to the treadle and release the latch mechanism. The direction in which the latch plate must be moved for moving it out of its restricting position is opposite from the direction in which the treadle must be moved to reach its operative position.
Abstract:
A handle of the operator is mounted on an external surface of a flange portion of a wall of an enclosure for a molded case circuit breaker and is drivingly connected to an operating handle of the circuit breaker. Interlock means prevent the operating handle of the circuit breaker from being turned to its ON position with a cover of the enclosure open, and the handle of the operator is normally positioned to mechanically interfere and thereby prevent the opening of the cover when the operating handle of the circuit breaker is in its ON position. The handle of the operator is pivotally mounted for limited movement relative to a drive shaft of the operator and can be locked in a single position to lock the circuit breaker handle in either its ON or OFF position. A true position indicator shows the position of the circuit breaker handle regardless of the position of the operator handle.
Abstract:
An electric strike with a pivotally mounted catch which is locked by a pivotally mounted detent engageable with a pivotally mounted detent arm controlled by the catch, movement of the detent being controlled by an electrically energizable solenoid and moveable core assembly which has a portion of the core extending outwardly of the solenoid, the core being pivotally interconnected with the detent and said portion of the core moving inwardly of the solenoid upon energization of the latter. The detent arm may be omitted and the detent may, in such case, engage a pin carried by the catch.
Abstract:
The structure comprises a push button having a cylindrical body portion provided with a head portion at one end and a flattened end portion at the other end and a mounting receptacle formed in a cover of a circuit breaker. An opening through the mounting receptacle has a larger outer portion and a smaller inner portion which define an outwardly facing shoulder. The smaller inner portion has a pair of diametrically opposed slots. A longer one of the slots extends along the entire longitudinal length of the wall of the inner portion, and a shorter one of the slots extends partially along the wall of the inner portion commencing at the innermost end of the receptacle portion. In one turned position, the push button fits slidably within the opening with a laterally extending part of the flattened end portion fitting within the longer slot. When the button is pushed inwardly and rotated 180*, the laterally extending part is aligned with the shorter slot. Upon release of the button, the outer biasing action of a helical spring positioned around the body portion results in the entry of the extending part into the shorter slot thereby securing the button within the opening of the receptacle.
Abstract:
A generally U-shaped driving member has a first leg portion pivotally mounted on a bracket secured to a side wall of an openfront box and a second leg portion pivotally associated with a base member formed of insulating material and mounted on a rear wall of the box. An operating handle is pivotally mounted between the bracket and the side wall and is provided with a tang extending through an arcuate slot in the bracket. A tension spring is connected at one end to the tang of the handle and at the other end to a bight portion of the U-shaped driving member. The first leg portion of the driving member has a tang extending through a slot in the bracket into an aperture provided in the handle. An interlock member is reciprocally mounted between the bracket and the side wall and driven by the tang of the handle. The second leg portion of the driving member is provided with a slot in which a driving boss of a blade actuator pivotally mounted in the base member is received.
Abstract:
The screw has a tool-receiving recess comprising a basically cylindrical outer recessed portion and a hexagonal inner recessed portion. The outer recessed portion has a plurality of nubs or protrusions spaced circumferentially around its cylindrical wall. A conventional hexagonal allen wrench inserted in the outer recessed portion is used to tighten the screw by engagement with the nubs. The nubs are designed so that they will be sheared by the wrench when a predetermined torque is exerted by the wrench. The screw can be loosened by the wrench when the wrench is received in the inner recessed portion. In one embodiment, the wrench can be inserted in the inner recessed portion before the nubs are sheared; in a second embodiment, shearing of the nubs is necessary before the wrench can be inserted in the inner recessed portion.
Abstract:
The housing includes two outwardly flanged channel members, four auxiliary housing members of generally Z-shaped cross section, and four end plate members. Each flange of the two flanges of one channel member is secured to one of the two flanges of the other channel member by a row of screws which also secures one pair of the Z-shaped auxiliary housing members in place, reversely positioned with respect to each other and with free end portions pointing toward the other pair of Z-shaped auxiliary housing members secured to the other flanges of the channel members. The flanges of the channel members and corresponding portions of the Z-shaped auxiliary housing members are cut away at opposite ends of the housing to present flat surfaces to the end plate members, which are secured in place for additional strength at the joints when sections of the bus duct are secured together by tie channels. Gaskets are provided between the flanges of the channel members and under the end plate members where the flanges are cut away.
Abstract:
A timing attachment for a relay including a light source and detector and an apertured control member movable between the light source and detector to influence transmission of light therebetween, the movement of the control member being controlled by the relay, and the light source and detector providing initiation of the timing. Reversal of the timing attachment on the relay changes the position of the attachment relative to the control member to enable change from time delay after energization of the relay to time delay after de-energization or vice versa.
Abstract:
A latching attachment is provided for an electromagnetic relay. An insert for the relay movable contact carrier is employed in association with the latching attachment and the insert has at least one projection extending therefrom. The latching attachment includes a rotatable plate, mounted adjacent the insert projection and having an aperture therethrough and the plate is biased into a position in which the aperture is less than fully aligned with the projection on the insert, thereby preventing return of the contact carrier from its energized position to its de-energized position after the relay has been energized and subsequently de-energized. Manual and electromagnetic operators are provided for rotating the plate aperture into full alignment with the insert projection for releasing the relay contact carrier.
Abstract:
Through an arrangement of linkages the rotary motion of the output shaft of a reversible gear motor is converted into linear motion to actuate a handle operating carriage and thereby also a pivotable operating handle of an electrical control device. A manually operable means for moving the carriage is also provided which includes means for automatically disconnecting the power to the gear motor upon application of a tool.