Abstract: A linkage and operating assembly is provided for a dead tank circuit breaker. The circuit breaker has a plurality of pole assemblies and an actuating assembly associated with each pole assembly for opening and closing a movable electrical contact of the associated pole assembly. The linkage and operating assembly includes a linkage module having a plurality of drive structures. Each drive structure has a portion constructed and arranged to be removably coupled to an associated actuating assembly. An operating mechanism is coupled with the linkage module for causing movement of the drive structures substantially simultaneously. When the portions of the drive structures are decoupled from the associated actuating assemblies, the linkage module together with the operating mechanism is constructed and arranged to be removed as a single unit from the circuit breaker.

Abstract: Drive structure is provided for connection between an actuating assembly of a circuit breaker and linkage structure for opening and closing a movable electrical contact disposed in a volume of insulating material in a pole assembly. The drive structure includes a drive lever constructed and arranged to connect with the at least one actuating assembly. A drive shaft has first and second ends, with the first end being removably coupled to the drive lever so that rotation of the drive shaft rotates the drive lever. Seal structure is disposed between the drive lever and the actuating assembly such that the drive shaft can be removed from the drive lever without disrupting the volume of insulating material.

Abstract: Holding structure includes a gear rack member for coupling with an object for movement therewith. The gear rack member includes a set of a teeth and a cam profile surface. A latch is associated with the set of teeth so as to engage and disengage the teeth. A cam follower is fixed to the latch to engage the cam profile surface thereby defining the engaged or disengaged position of the latch with respect to the teeth. A spring provides torque on the latch. The holding structure is constructed and arranged such that during movement of the object in an intended direction, the latch engages the teeth and is held in the engaged position by the spring so as to stop any movement of the object in a direction that is opposite the intended direction, otherwise, the spring is constructed and arranged to hold the latch in the disengaged position.

Abstract: Linkage structure is connected between an operating mechanism and an actuating assembly of a circuit breaker for opening and closing an electrical contact of a pole assembly. The linkage assembly includes a lever to connect with the actuating assembly. A connection rod is coupled to one end of the lever and is associated with a close spring for closing the electrical contact. A spring structure is coupled to another end of the lever. The spring structure includes an open spring providing a spring force on the lever for opening the electrical contact. The open spring places the connection rod in tension. Retaining structure is associated with the lever and the spring structure to ensure that the spring force of the open spring, exerted on the lever, is directed to the retaining structure so that tension on the connection rod is removed, enabling the connection rod to be serviced.

Abstract: Linkage structure is provided for connection between an operating mechanism and at least one actuating assembly of a circuit breaker for opening and closing a movable electrical contact of a pole assembly associated with the actuating assembly. The linkage structure includes at least one lever constructed and arranged to connect with the at least one actuating assembly. At least one connection rod is coupled to the lever and associated with a close spring for closing the electrical contact. At least one spring structure is coupled to the lever. The spring structure includes at least one open spring providing a spring force on the lever for opening the electrical contact while maintaining the connection rod in tension.

Abstract: A pole and actuating assembly for a circuit breaker includes a support frame, a plurality of pole and actuating members carried on the support frame, cabinet movably coupled with respect to the support frame, and guide structure between the support frame and the cabinet. The guide structure is constructed and arranged to permit guided, generally vertical movement of the cabinet with respect to the support frame so that the cabinet can be moved between an installation position wherein a bottom surface of the cabinet is on a plane different from a plane of the support frame, and a travel position wherein the bottom surface of the cabinet is on generally the same plane as the support frame.

Abstract: Holding structure includes a gear rack member for coupling with an object for movement therewith. The gear rack member includes a set of a teeth and a cam profile surface. A latch is associated with the set of teeth so as to engage and disengage the teeth. A cam follower is fixed to the latch to engage the cam profile surface thereby defining the engaged or disengaged position of the latch with respect to the teeth. A spring provides torque on the latch. The holding structure is constructed and arranged such that during movement of the object in an intended direction, the latch engages the teeth and is held in the engaged position by the spring so as to stop any movement of the object in a direction that is opposite the intended direction, otherwise, the spring is constructed and arranged to hold the latch in the disengaged position.

Abstract: Linkage structure is connected between an operating mechanism and an actuating assembly of a circuit breaker for opening and closing an electrical contact of a pole assembly. The linkage assembly includes a lever to connect with the actuating assembly. A connection rod is coupled to one end of the lever and is associated with a close spring for closing the electrical contact. A spring structure is coupled to another end of the lever. The spring structure includes an open spring providing a spring force on the lever for opening the electrical contact. The open spring places the connection rod in tension. Retaining structure is associated with the lever and the spring structure to ensure that the spring force of the open spring, exerted on the lever, is directed to the retaining structure so that tension on the connection rod is removed, enabling the connection rod to be serviced.

Abstract: A pole and actuating assembly for a circuit breaker includes a frame, a plurality of pole and actuating members including a pair of outer pole and actuating members fixed to the frame and a center pole and actuating member disposed there-between and rotatably fixed with respect to the frame. The center pole and actuating member, in an installation position, has a vertical height greater than a vertical height of each of the outer pole and actuating members. Bracket structure is coupled to the frame to permit rotation of the center pole and actuating member to be disposed securely at an acute angle with respect to the frame, thereby reducing the vertical height of the center pole and actuating member in a travel position thereof.

Abstract: A pole and actuating assembly for a circuit breaker includes a support frame, a plurality of pole and actuating members carried on the support frame, cabinet movably coupled with respect to the support frame, and guide structure between the support frame and the cabinet. The guide structure is constructed and arranged to permit guided, generally vertical movement of the cabinet with respect to the support frame so that the cabinet can be moved between an installation position wherein a bottom surface of the cabinet is on a plane different from a plane of the support frame, and a travel position wherein the bottom surface of the cabinet is on generally the same plane as the support frame.

Abstract: Linkage structure is provided for connection between an operating mechanism and at least one actuating assembly of a circuit breaker for opening and closing a movable electrical contact of a pole assembly associated with the actuating assembly. The linkage structure includes at least one lever constructed and arranged to connect with the at least one actuating assembly. At least one connection rod is coupled to the lever and associated with a close spring for closing the electrical contact. At least one spring structure is coupled to the lever. The spring structure includes at least one open spring providing a spring force on the lever for opening the electrical contact while maintaining the connection rod in tension.

Abstract: Drive structure is provided for connection between an actuating assembly of a circuit breaker and linkage structure for opening and closing a movable electrical contact disposed in a volume of insulating material in a pole assembly. The drive structure includes a drive lever constructed and arranged to connect with the at least one actuating assembly. A drive shaft has first and second ends, with the first end being removably coupled to the drive lever so that rotation of the drive shaft rotates the drive lever. Seal structure is disposed between the drive lever and the actuating assembly such that the drive shaft can be removed from the drive lever without disrupting the volume of insulating material.

Abstract: A linkage and operating assembly is provided for a dead tank circuit breaker. The circuit breaker has a plurality of pole assemblies and an actuating assembly associated with each pole assembly for opening and closing a movable electrical contact of the associated pole assembly. The linkage and operating assembly includes a linkage module having a plurality of drive structures. Each drive structure has a portion constructed and arranged to be removably coupled to an associated actuating assembly. An operating mechanism is coupled with the linkage module for causing movement of the drive structures substantially simultaneously. When the portions of the drive structures are decoupled from the associated actuating assemblies, the linkage module together with the operating mechanism is constructed and arranged to be removed as a single unit from the circuit breaker.

Abstract: The invention relates to a device and method for analysis of a tool 50 e.g. used on a machine tool. A tool detector 5 includes a light emitter 12 and a light receiver 34. Tool 50 when progressed into a beam 20 of light emitted from the emitter 12 will cause a signal from the receiver to change. Circuitry 32 includes a digital signal processor which processes the signal from the receiver and produces an output only if the signal conforms to a predetermined condition. Preferably this predetermined condition could be e.g. a characteristic shape of the signal from the receiver, a change in a value derived from a succession of such signals or a change in the minimum or maximum values of a succession of signals from the receiver.

Abstract: A probe (10) for a machine tool has a switch (32) or other sensor for connecting its battery power supply in response to movement of the probe. In a preferred embodiment, the switch responds to rotation of the probe in the machine tool spindle. The switch (32) is responsive to linear accelerations, but is mounted in the probe so as to respond also to the rotation. A circuit is provided to discriminate between the rotation and linear movements.

Abstract: A probe has internal circuitry capable of operating in a plurality of different modes, for example a variety of filter modes and turn off modes. A switch on the probe sends an input to a controller which is arranged to set the mode in response to operation of the switch. The switch may be a push button which is operated externally of the probe by means of an actuator in the form of a plunger. The probe has a workpiece-contacting stylus mounted on a seat from which it is deflectable. The stylus and the seat may comprise the switch. An indicator, e.g., an LED, indicates the mode in response to an output from the controller. The controller outputs a plurality of indications of different modes in a sequence and a mode is selected by operating the switch once the desired mode is indicated.

Abstract: The invention relates to a device and method for analysis of a tool (50) e.g. used on a machine tool. A tool detector (5) includes a light emitter (12) and a light receiver (34). Tool (50) when progressed into a beam (20) of light emitted from the emitter (12) will cause a signal from the receiver to change. Circuitry (32) includes a digital signal processor which processes the signal from the receiver and produces an output only if the signal conforms to a predetermined condition. Preferably this predetermined condition could be e.g. a characteristic shape of the signal from the receiver, a change in a value derived from a succession of such signals or a change in the minimum or maximum values of a succession of signals from the receiver.