Abstract:
Metal-enclosed switchgear comprising improved safety interlock means for preventing withdrawal or insertion of a circuit interrupter, or charging of the overcenter spring means, under certain conditions.
Abstract:
A circuit interrupter with an interlocking system is provided with stored energy overcenter spring operating means for operating the interrupter between open and closed positions. A latch device latches the operating means in charged positions for the opening and closing operations. An interlocking system provides adequate safety to operating personnel by rendering the latch device inoperable when an enclosure door is opened, or to prevent opening of the door when the interrupter is in the closed position.
Abstract:
A circuit interrupter having stored energy overcenter spring operating means for operating the interrupter between open and closed positions and having auxiliary spring closing means for overcoming electromagnetic ''''blow-out'''' forces incurred by fault current.
Abstract:
An improved circuit interrupter comprises an operating shaft pivotally movable to move a movable contact structure, an overcenter spring operating mechanism movable by means of a manually operable drive means from a spring discharged position to an overcenter spring charged position, latch means in a latching position for latching the operating shaft until the overcenter spring operating mechanism reaches the overcenter spring charged position and means automatically unlatching the latch means when the overcenter spring operating mechanism reaches the overcenter spring charged position to permit the overcenter spring operating mechanism to drive the movable contact structure to the closed position independent of the manually operable drive means. The latch means may also be a double latch for performing the same latching function during an opening operation. The latch means prevents slow closing and opening operations of the circuit interrupter.
Abstract:
An improved detachable clamping electrical connector is provided including a pair of spaced slotted plate portions, each having an aperture therethrough, of generally the same size and configuration as the electrical stud, to which electrical connection is desired. In one embodiment, a slotted U-shaped electrical strap member is provided, having spaced apertures therethrough, and utilized with clamping means extending through the closed end of the U-bend to clamp the furcations of the connector together and around the associated electrical stud. In another application of the invention, separate independent spaced slotted plates are provided, each having furcations leading into accommodating apertures, which accommodate the electrical stud, to which electrical connection is desired. Cleats and a clamping bolt are provided to urge the furcations of the separate slotted plates together to provide firm electrical engagement with the associated electrical stud. An improved disconnecting switch, having a grounding switch associated therewith, is provided utilizing the aforesaid electrical connector. The improved electrical connector may be associated with a terminal bushing having electrical connection thereto provided by the aforesaid detachable electrical connector. The invention may be applied to a bus-riser attached to the main disconnecting contacts of a circuit breaker, again having the improved electrical connector attached to the primary disconnecting stud portion thereof. The invention may be applied, importantly, to the connecting stud of a vacuum-type circuit breaker to make rigid good electrical connection therewith, either at the stationary contact end, or at the movable-contact end of the vacuum circuit breaker.
Abstract:
A circuit breaker operating mechanism characterized by a crank shaft, a closing spring connected to the crank shaft, motoroperating structure for driving the crank shaft to charge the closing spring, a ratchet wheel mounted on the crank shaft, a reciprocating pawl structure supported to drive the ratchet wheel, a motor comprising an output shaft and cam means or driving means on the output shaft operable upon each revolution of the output shaft to operate the pawl structure to advance the ratchet wheel to thereby charge the closing spring, the cam means being operable in directions toward and away from the reciprocating pawl structure, and spring means attached to the output shaft for urging the reciprocating pawl structure only in the direction of advancement of the ratchet wheel.
Abstract:
A circuit interrupter having relatively movable contacts, means for moving the contacts between open and closed positions which means include a support arm for the movable contact, a rotatable operating shaft, a drive structure between the shaft and the arm including a connecting link and a member extending substantially radially from the shaft and fixedly mounted thereon, the link and the member being pivotally connected, adjustable means for pivotally mounting the link on the member and comprising an elongated slot in the member and an aperature in the link which is aligned with the slot, a nut and bolt assembly extending through the slot and aperture and a bushing mounted on the bolt and within the aperture, the bushing having a cylindrical surface and having tapered annular ridges at each end thereof, whereby upon tightening of the nut and bolt assembly the ridges bite into the bifurcated portion of the member and thereby prevent movement of the nut and bolt assembly with respect to its desired location in the slot.