A power plant in which a turbine and compressor are mounted on a power deoping shaft, with the turbine and compressor connected serially in a closed gas circuit. A heater is interposed between the compressor and turbine on the upstream side of the turbine and a cooler is interposed between the turbine and compressor on the downstream side of the turbine. Gas storage means is provided having valved connections with the upstream and downstream sides of the compressor. An outer circuit is provided ...

A redundant power supply for a body organ stimulating device having at least two parallel branches. Circuit means are provided which are operatively connected to the output terminals of the power supply and to each parallel branch thereof and are responsive to the voltage across the output terminals of the power supply falling to a predetermined value for automatically serially interconnecting the power sources of the power supply.

A power transformer having a single ferrous laminated core with primary and secondary windings surrounding the laminated core and a ferrous housing, the ends of the laminated core in abutting relationship with the side of the ferrous housing completing the magnetic path for the transformer.

A filter includes a cylindrical filter element which is arranged to normally have fluid passed therethrough. A linear bypass valve opens in response to a predetermined pressure drop through the filter element and operates an indicator when the valve is opened. A spring within the filter element holds the valve closed at other times. A second spring opens the valve when the filter element or the spring or both are omitted, thus causing the indicator to be shifted in the same manner as when the pr...

An electrical eraser having a linearly reciprocating drive for oscillating an elongated erasing element along its longitudinal axis. This motion of the element provides fast erasing action with minimum abrasion or fraying of paper.

A transportation system includes two power sources that extend along opposite sides of a right of way for an electrically powered vehicle. Each power source includes an elongated open side housing of electrically insulating material that defines a channel having opposed inner surfaces disposed at an angle to one another and tapering inwardly. A power conductor is disposed in each inner surface and a third power conductor is located at the innermost end of the channel substantially midway between...

A device for converting high level voltage to relatively low level DC voltage for the driving of a plurality of loads. The device utilizes a relatively small transformer with a gapped core and a single transistor to regulate the high frequency power transformer process. Controlled release of magnetic energy induced in the core prevents magnetic saturation of the core.

Power driven devices in which a tool is axially impacted by a driver mounted in a reciprocably driven piston. The tool can be intermittently rotated or not, as desired.

An integrated electro hydraulic actuator package for remotely controlling the position of an aircraft control surface has both its input power and its input command signals supplied solely by wires from remote locations. The package encloses an electric motor running wet in the hydraulic fluid and driving a reversible variable displacement pump connected directly to a differential piston and cylinder actuator and is designed to be completely manifolded. A differential piston and cylinder reservo...

A power converter is disclosed which is used for converting an a.c. power to a d.c. power or vice versa, and which comprises a first converter unit operated at a variable control angle with phase advanced to an input a.c. source voltage, and a second converter unit operated at a variable control angle with phase lagged to the input a.c. source voltage and having a d.c. side terminal connected in series to that of the first converter unit. At least one additional converter unit having a d.c. side...