An electrical power supply for providing an electrical power signal of substantially constant voltage when the current level of the power signal is less than a predetermined value and for reducing the voltage of the power signal below said predetermined level when the power signal current level exceeds the predetermined value includes a ferroresonant transformer. A saturable reactor provides a current responsive impedance connected to the primary of the ferroresonant transformer for reducing the...

A power supply provides a low-level DC voltage to DC load circuits by first rectifying the standard AC voltage and thereafter reducing the rectified AC voltage to the low-level DC voltage. The reduction of the rectified AC voltage to the low-level DC voltage is accomplished by a power transformer which is switched on or off by a pair of switching transistors. The switching transistors are operated in a "push-pull" mode by a pair of control transformers operating in combination with a control cir...

An uninterruptible power supply derives regulated power from either a primary power source or a reserve power source. A power flow control unit derives the output power as needed from either one or both power sources. Its operating characteristics are selected so that complicated transfer and disconnect circuitry is eliminated.

A fireplace having means for the injection of combustion and necessary dilution air consisting of a pair of louvered chambers positioned on each side of the front of the fireplace. Deflectors associated with the louvers direct the air inward and upward, whereby streams of air from the two louvered chambers combine in the central upper region of the fireplace opening and enter the fireplace. The supplemental air is obtained from outside the building housing the fireplace through a cased inlet or ...

A hose storage and supply apparatus comprising a hose guide track having front and rear ends, the guide track having means on which a hose can move as it is paid out or is retracted, a hose on the guide track, a fluid coupling means joined to each end of the hose on the guide track for joining a fluid supply conduit thereto, and means operably connected to the hose to move it along the guide track from a retracted position to a paid out position and back to a retracted position.

A portable emergency oxygen supply which may be carried without difficulty by a user and is safe under all conditions. The supply includes a canister containing oxygen-rich gas at relatively low pressure, the canister having a normally-closed valve which is provided with an actuating switch. The valve output is coupled by a feed tube to the interior of an inflatable bellows which is attached to and communicates with a face mask whereby the user is able to repeatedly inhale and exhale the volume ...

A purification unit includes an electrolytic cell adapted to hold a body of water to be purified and provided with two electrically insulated electrodes, a pump supplying the water to be purified to the cell through a filter and driving purified water out of the unit, a power supply for supplying electrolyzing current to the electrodes, a control circuit which generates a sensible signal indicative of the operating conditions of the pump, the power supply, and the filter, and a housing which enc...

A replaceable ink reservoir for use in ink printing equipment, particularly mosaic jet ink printers equipped to receive replaceable reservoirs, the same reservoir including a housing containing a part flexible ink bag in a chamber defined by housing walls with a flexible membrane supported by the walls and plate means overlying the flexible membrane for application of pressure on the ink supply to force the same through the printing head channels.

In a power supply circuit of the type including a first rectifier to be connected to an AC power source through a power switch, a transformer with primary and secondary windings, a second rectifier connected to the secondary winding of the transformer to provide a desired DC output voltage, a pulse width modulated signal producing circuit, and a transistor connected to the primary winding of the transformer to be supplied with the pulse width modulated signal so as to chop the direct current flo...

A fuel supply unit is proposed wherein the pump rotor and electromotor armature are mounted independently of one another on a common fixed axis. A pin which engages in a corresponding recess in the pump rotor for entrainment purpose is provided on the motor armature.