A dynamically tuned free rotor gyro is equipped with a set of three case-fixed torquers equally spaced circumferentially about the drive axis beneath the rotor. Three pickoffs are arranged diametrically opposite the corresponding torquers beneath the rotor. The outputs of the three pickoffs are combined to produce a vector rebalance signal, which is nulled by the effect of the torquers. The vector rebalance signal is resolved into three separate control signals for the corresponding torquer driv...

A power measuring circuit. A circuit for measuring three-phase real or reactive power utilizing two wattmeter circuits without employing additional phase shifting networks. The current input of each wattmeter circuit is driven from a current transformer having two primary winding sections having an equal number of turns. Watts are measured using the standard two-wattmeter method. When measuring VAR's, the voltage connections are exchanged and the primary windings of the current transformer so in...

A light source emits light having two components which ave slightly-different frequencies and which have different planes of polarization. The emitted light is separated into first, second, and third parts travelling along different paths respectively. First, second, and third reference gratings diffract the first, second, and third light parts respectively. First, second, and third illumination optical systems selectively transmit the diffracted first, second, and third light parts respectively...

A method of controlling a three-phase, three-level inverter comprises the steps of: jugding whether the current of the output terminal of an inverter of the phase such that the electrical potential of the output terminal equals to the neutral-point terminal of the capacitor among three-output terminals of the inverter is in a positive direction in which current flows into a load connected to this output terminal or in a negative direction in which current flows from the load when another on/off ...

A telescopic fluid ram or thruster utilizing pressurized gas and having an inner and outer piston that slides within a cylindrical bore including a central probe which is tapered and extends into the bore of the inner piston where it will cause the inner piston to move under high pressure while the gas escaping from around the tapered area produces a holding force to hold the outer piston in place until the inner piston is fully extended, at which time the outer piston will extend under a reduce...

A three speed transmission hub for a bicycle, which is adapted to allow a gear frame with planetary gears and a ring gear with inner teeth in mesh with the planetary gears to be axially movable with respect to a hub shaft and is provided between the gear frame and a drive member with a clutch means engageable only in high speed transmission so that the high speed transmission may be exactly carried out. Relay pawls are provided between the ring gear and the drive member through which the drive f...

A three-wheel motorcycle having an outer frame with rear wheels mounted on a double axle with differential therebetween for a drive from a powerful automobile type engine together with an inner support frame pivotally mounted from said main outer frame with said inner pivotal frame supporting the front motorcycle type single steerable wheel. Handlebars mounted for four-way movement together with an operator's seat and passenger seats are also supported and mounted on the pivotal frame. A unique ...

A tricycle frame is elongated to carry a sprayer or a fertilizer spreader, or the like. Two transversely spaced rear wheels engage the ground at the rear of the frame and are independently driven by hydraulic motors. A ground engaging front wheel, also independently driven by a hydraulic motor, steers the vehicle. The front wheel is carried on a steering post including a vertical spindle journaled on a framework extending forwardly from the main frame. A cantilever mounted on the steering post p...

Disclosed is an embodiment of a conventional zipper in which a single slide fastener joins teeth mounted on three surfaces allowing closure of two separate compartments with one movement. Further disclosed is a slide fastener in which two surfaces are independently connected to a third common surface through separate slide fasteners but utilizing one common surface. Additionally disclosed are details of the fastening teeth which allow the sliders to be supported thereon.

A three dimensional time piece for determining the correct time anywhere in the world. The time piece having a world globe with a 24 hour time band therearound, and lighting inside the globe to indicate both night time and day time on the surface of the globe. The time piece further indicates the month of the year with changes in light intensity on the surface of the globe to represent the inclination of the sun and the corresponding season of the year.