A power booster assembly for use to increase the power used in pulling or driving tool mechanism such as used in straightening an automobile frame and the like. A cylindrical body having closed ends and attachment means at each of the ends with a power piston mounted for reciprocation therein together with a spring biased hammerhead which is latchable on to one end of the power piston for fluid actuation of said piston to draw the hammerhead against the spring bias. Cam release structure within ...

Electrical power lines connected to loads are monitored by a protective circuit assembly to suppress peak transient voltages and surges by use of a Zener clamping device. Impedance branches connected in parallel with the Zener device share the transient loads when Zener break-down occurs under abnormal conditions. Each impedance branch includes a non-linear resistor arranged to clip voltages at different levels, at least one of the branches having a fixed resistor connected in series with the no...

Control means is provided, in which the whole of the phase difference of a power waveform of each phase is matched to a value dividing a cycle of the power waveform into n-equal portions, and at the same time, the whole of the power value of each phase is controlled to be identical, so that the power conversion unit having a n-alternating current output (n is an integer numeral serving as n.gtoreq.2) connected to the direct current power source and smoothing means provided between the direct cur...

A central, longitudinally extending, main body boat portion has a step planing surface located forward of the boat's center of gravity. Parallel side sponsons are connected by a wing structure to the main body with the sponsons parallel to the main body portion. Each sponson has forward and rearward stepped planing surfaces disposed, respectively, forwardly and rearwardly of the boat's center of gravity. The propeller and powerplant therefor are disposed in the main body portion and positioned r...

A novel high voltage power supply is disclosed which generates an unregulated output voltage from a dc input voltage. The magnitude of the unregulated output voltage may exceed the magnitude of the applied dc voltage. This output voltage appears across a capacitor which is in series with an inductor and a switch. The dc voltage is applied across the inductor and switch, and the switch is periodically closed by an oscillator. While the switch is closed, the voltage across the capacitor increases ...

A new and improved low-speed, high-torgue power unit including a power means that is mounted on a drive wheel for rotation in a receptacle holding a body of fluid. The power means includes a propelling means which acts against the fluid body to rotate the drive wheel about a power output shaft on which the drive wheel is mounted. A movable gate means may be provided with the receptable to restrict circular flow of the fluid and increase thrust of the propelling means.

A power controller for transmitting alternating current from a power input circuit to a load, the controller being a master silicon controlled rectifier, hereinafter the "master rectifier," and a slave silicon controlled rectifier, hereinafter the "slave rectifier," connectible in parallel with the load across the input circuit, a capacitor chargeable during positive half cycles for discharging at the zero voltage crossover between half cycles of positive and negative input voltage to render the...

A carrying structure has a wall which defines a duct. A central structure comprising an axial-flow turbine and a generator is disposed in said duct. At least two radial arms, which are substantially horizontal, are rigidly fixed to said wall and hinged to said central structure.

The striker is mounted in a barrel for axial reciprocal movement thereby to impart successive hammer blows to the end of a tool shank element extending into one end of said barrel. An actuator is connected to the piston by lost-motion means. A motor driven, mechanical crank assembly is connected to the actuator for reciprocating the piston such that its velocity in the hammer-direction is greater than its velocity in the return-direction.

Disclosed is a power ventilator attached to a roof for ventilating an attic or the like. The power ventilator is provided with a base which attaches to the roof adjacent an opening in the roof. The base has a hollow cylindrical housing which forms an air duct. A plurality of wire supports are used to attach a generally dome-shaped cover and an electrically powered fan and motor to the cylindrical flange. Each wire support has a curved portion which conforms with and contacts an arcuate portion o...