Abstract: A shaft seal for an exhaust fan. The seal limits leakage from within an exhaust fan housing around an exhaust fan drive shaft that extends between a rotational power source exterior to the exhaust fan housing and a position within the exhaust fan housing. The seal comprises a plenum generally positioned about the exhaust fan drive shaft at the point where the shaft extends into the fan housing; an auxiliary blower comprising a housing, an internal blade driven by an auxiliary blower drive shaft, and an auxiliary blower drive to rotate the drive shaft where the auxiliary blower drive is operatively associated with the rotational power source such that operation of the rotational power sources causes a rotation of the exhaust fan drive shaft and the auxiliary blower drive shaft; and a duct fluidly connecting the auxiliary blower housing to the plenum.

Abstract: The present invention relates to a height adjustable piece of furniture comprising at least one extendable column, an electric motor adapted for driving the extendable column, at least one switch for operation control of the electric motor, and a power control unit adapted to control the power distribution to the height adjustable piece of furniture, and wherein the power control unit is connected to a power source. The connection between the power source and the height adjustable piece of furniture is provided via the switch, and the switch is in an activated state adapted to connect the power source to the height adjustable piece of furniture, and in a deactivated state adapted to disconnect the power source from the height adjustable piece of furniture. The present invention further relates to a power control unit for control of power distribution to a height adjustable piece of furniture.

Abstract: An excavator drive system wherein one of a pair of propulsion motors shares one of a pair of inverter power sources with another of a pair of motors dedicated to crowd and hoist motions. A pair of non-volatile bi-state switches, triggered under control of a controller, allow sharing of inverters between hoist and propel 1 motors. Another pair of switches allows inverter sharing between propel 2 and crowd motors. Each pair of switches enables change over and power transfer from one of the paired motors to the other motor. The bi-state switches enable quicker transfer of power between motors than transfer switches employing external motor-powered mechanical transfer linkages. Bi-state transfer switches also maintain transfer coupling status in the event of power failure to the switch actuators, allowing an excavator operator to continue the drive function in operation prior to the switch power failure.

Abstract: The present invention relates to a multipolar electromagnetic switching module designed to be connected by line connections (t1, t2, t3) to a main electromagnetic switching device (AP) and by load connections (U, V, W, u, v, w) to at least one motor and having, in a unit (Bo), between said connections, several load paths fitted with switching poles whose contacts are always alternately closed and controlled by a switching electromagnet (EI) driven by a control circuit, each of the switching poles (C1, C2, C3) consisting of a movable contact holder (Pc) between two conductors (Cf1, Cf2) bearing fixed contacts characterized in that, for each pole, the movable contact holder (Pc) comprises two parallel loop-shaped conductors (Cm1, Cm2) connected to a connection (T1, T2, T3) and that the two fixed contact parts (Cf1, Cf2) are loop-shaped and connected to connections (U, V, W).

Abstract: The present invention herein relates to a driving control apparatus of motorized scooter comprised of battery, driving unit, and motor, characterized in which the driving unit consists of at least a relay, a start-up and protective circuit, an under-voltage protective circuit, a power switch and speed control circuit, and a braking unit, that when the power switch and speed control circuit are on, and the relay is open, user may push the wheels of the scooter manually to drive the motor; when a set speed is reached and the relay is closed, the motor is driven directly, controlling the speed of the scooter, in addition, when the speed of the scooter is below a certain rate, the relay will be opened to stop the motor; at this time, the user may restart the motor by pushing the wheels of the scooter manually to move the scooter forward.

Abstract: The present invention relates to a multipolar electromagnetic switching module that is connected by line connections (t1, t2, t3) to a main multipolar electromagnetic switching device (AP) and by load connections (U, V, We U′, V′, W′) to at least one motor and having between said connections several power current lines (C1, C2, C3) fitted with switching poles the contacts of which are always alternately closed, and controlled by a switching electromagnet (E2) driven by an electric control circuit (CC), and characterized in that the switching poles (C1, C2, C3) and current lines are arranged to perform a motor control function such as reverser, star-triangle or distributor and in that the pole control assembly consisting of the switching electromagnet (E2) and the control circuit (Cc) is offset relative to the switching poles and load paths in a direction perpendicular to the rear fastening surface (P) of the module such that the width (L) of the module is reduced and more or less identical t

Abstract: An improved motor starter assembly is provided on a frame and having an external profile which matches that or is within that of a prior motor starter is disclosed. The improved motor starter assembly provides a soft start circuit within the profile. Retrofitting of prior art motor starters is accomplished by moving the power fuses and related hardware of an existing medium voltage (2.4 Kv to 7.2 Kv) and installing the new soft start circuit on the frame of the existing motor starter. The retrofitted arrangement mounts the motor fuses horizontally and the vacuum contactors vertically in an arrangement to provide enough space within the external profile to mount the soft start circuit arrangement.

Abstract: An antitheft control apparatus for a bicycle includes a key and an antitheft control circuit. The key includes a key base, an enabling signal transmitter supported to the key base for transmitting a wireless enabling signal, a power signal receiver for receiving an external wireless power signal and a command signal transmitter supported to the key base for transmitting a wireless command signal, wherein the command signal transmitter is powered by the power signals received by the power signal receiver. The antitheft control circuit includes a lock control circuit for providing a lock control signal for at least one of locking and unlocking a bicycle antitheft device, a switch for selectively enabling the lock control circuit to provide the lock control signal, and a sensor for sensing the wireless enabling signal transmitted by the key. The switch is operatively coupled to the sensor for enabling the lock control circuit, in response to the enabling signal, to provide the lock control signal.

Abstract: An antitheft control circuit for a bicycle includes a lock control circuit for providing a lock control signal for at least one of locking and unlocking a bicycle antitheft device, a normally open switch for selectively enabling the lock control circuit to provide the lock control signal, and a sensor for sensing an externally transmitted enabling signal. The switch is disposed between the lock control circuit and a power source for providing power from the power source to the lock control circuit in response to the enabling signal.

Abstract: A machining program execution method for an NC device, in which parameter values are automatically modified in accordance with the machining types in continuously executing machining operations of different machining types, such as rough machining, intermediate finish machining, finish machining, etc., by the NC device. A memory in the NC device is previously stored with the parameters to be modified in accordance with the machining types and the parameter values for each machining type, and machining programs and machining types are associated with each other and inputted to the NC device. At the start of execution of the individual machining programs, the machining types of the machining programs as objects of execution are discriminated by the designation of the machining type for the machining program and the parameter values are automatically modified in accordance with the machining type of the machining program.

Abstract: The present invention relates to an electrical circuit for current regulation in DC motors including a sensitivity control means therefor. The circuit includes a means for sensing a predetermined current level in the load of a DC motor. In combination therewith is a subcircuit for cutting-off the load current when the predetermined current level has been reached. Additionally, there is provided means for restoring the load current when, after load current cutoff, the inductive motor current has fallen to a level sufficient to restart the subcircuit.