Abstract: An improvement to a priority valve which provides priority flow to a priority function, not only directly from a fluid power source, but also from an accumulator when the priority demand exceeds the output of the fluid power source. This priority flow valve also provides flow to one or more secondary functions when the priority flow requirements are satisfied or when the priority flow path is blocked.

Abstract: A locking wire joint in a hydraulic cylinder between the barrel and bearing which also prevents rotational movement therebetween; including a locking wire having a U-shaped end, the wire being insertable through a slot in the cylinder barrel into a pair of mating annular grooves; with the u-shaped end engageable with the slot to lock the connected cylinder parts against rotation.

Abstract: Apparatus for providing pulses at a rate limited by an input analog control signal. The analog control signal is compared to a ramp voltage, and an output pulse is generated when the ramp voltage reaches the control voltage level.

Abstract: This automatic hydraulic cushioning device for cam plate positioning actuators on variable displacement, axial piston pumps eliminates the noise, vibration, and wear caused by hammering of the positioning actuator on the back plate when the actuator is close to full retraction. A supply of fluid under pressure, which is available at the back plate, is channeled to the cam plate positioning actuator. A valve in the actuator blocks off drainage of the fluid whenever the actuator is close to its fully retracted position. This retained fluid becomes a hydraulic stop and cushion for the actuator thus eliminating the hammering as well as the noise, vibration, and wear which results from the hammering.

Abstract: A low operating force valve which handles solutions having highly abrasive wettable powders. The valve is a low pressure butterfly-type, 3-way, two-position, valve; including a recirculating path in the closed position which is opened by a convex-shaped disc carried on a stem which rotates on the main valve shaft in conjunction with the two butterfly halves.

Abstract: A propeller grinding device and method employs two endless grinding belts which are transported past a grinding station to finish the front and back surfaces. A propeller blank is inserted between the belts and the belts are distorted by platens, each of which includes a plurality of independent platen vanes. Two cams selectively bear upon two camming surfaces of the vanes and move the vanes into desired positions corresponding to the surface contours to be formed on the front and back surfaces of the propeller blades. The cams are rotated as the blade is moved. They also may be moved along the camming surfaces. Additionally, the cams and platens may be moved parallel to the direction of cam rotation with respect to the belts. SUBACKGROUND OF THE INVENTIONThe present invention relates to grinding devices and, more particularly, to a grinder having an endless grinding belt capable of grinding contours, such as the airfoil shape of a propeller.

Abstract: A variable phase shifter and comparator useable, for example, in a scalloping suppression system within a V.H.F. Omni Range (VOR) aircraft bearing determining system. The digital phase shifter-comparator network is employed to cause a phase of the reference signal to follow a phase of the variable phase signal. The phase shifter is comprised of two counters and the phase comparator is comprised of a bistable multivibrator. The delayed reference signal is the output of the system, and an analog rate controller is employed to limit the rate at which the reference signal can follow the variable phase signal.

Abstract: A hydraulic control valve in a closed-center load responsive system having a passage with a check valve therein downstream of the inlet metering and signal passage allowing flow from the signal passage to the load prior to connecting the pressure circuit to the load circuit so as to relieve fluid from the signal circuit to the load circuit as the signal circuit attains a pressure higher than the existing load thus causing flow past the inlet metering whereby the pressure differential in the metering compensates the pump.

Abstract: A method and system for obtaining and displaying distance information to multiple DME ground stations using a single airborne transmitter-receiver and for displaying groundspeed to one of the stations. A DME is time multiplexed between two channels and display-memory means, the distance value being held in the display corresponding to each channel until that channel and the display corresponding thereto is updated or until a predetermined period of time has elapsed. Further, a DME which provides a distance data output in both search and track modes is multiplexed between primary and secondary channels and display-memory means, and is permitted to go into track on the primary channel but only into search on the secondary channel. When the system is on the secondary channel appropriate information is stored and the DME is returned to primary channel operation in the track mode.

Abstract: A DME apparatus and method for determining the distance of an aircraft from a ground station and the groundspeed thereof. Replies to the transmitting aircraft are distinguishd from replies to other aircraft and squitter by digitally storing information indicative of the times of receipt of all replies received during a first cycle and determining whether any of the stored times are identical to the times of receipt of replies received during the cycles following the first cycle for a predetermined number of successive cycles. If this criterion is met distance information is derived and displayed and a range gate is generated and combined with incoming replies. If replies fall within the range gate for at least a predetermined percentage of cycles then the apparatus is switched into the track state in which all replies are ANDed with the range gate before storage and the coincidence determination is effected.

Abstract: A scalloping suppression system and method for use in a V.H.F. Omni Range (VOR) aircraft bearing determining system. The system is arranged to respond to changes in phase of the received radial which are due to position changes of the aircraft but not to respond to the generally more rapid changes in phase which are due to scalloping. A digital phase shifter-comparator network is employed to cause the phase of the reference signal to follow the phase of the variable phase signal. The phase shifter is comprised of two counters and the phase comparator is comprised of a bistable multivibrator. The delayed reference signal is the output of the system and an analog rate controller is employed to limit the rate at which the reference signal can follow the variable phase signal. The limiting is effected in proportion to DME distance which is inputted to the rate controller as an analog voltage.

Abstract: An automatic control for reducing a flow pressure compensated variable displacement pump to a standby condition while the pump operated motor is lowering a heavy static load. The pressure in the motor exhaust line caused by the static load actuates the control to cut-off pressure to the downstream sensing line of the pump flow control. A bleed orifice in that downstream sensing line depressurizes the line causing the pump displacement servo to stroke back the displacement of the pump to a standby condition.

Abstract: The invention is a hydrostatic device which converts rotary motion to oscillating motion for driving a sickle bar type mower by using a rotating cam plate to operate a rocker arm through a hydraulic coupling in the form of a pair of hydrostatic cylinders. The cylinders are continuously charged and due to valving openings in the pistons, the cylinders are continuously maintained in-phase with each other and the sickle bar which is being driven.

Abstract: An auxiliary hydraulic front wheel drive including a pair of variable displacement pressure and flow compensated motors each connected to individual wheels; the auxiliary drive utilizes a pressure compensated pump source of the existing hydraulic system on the vehicle. The primary accessories run by said pump maintain a priority flow over the auxiliary drive motors since the pressure compensating level of the motors is set slightly below that of the pump.

Abstract: A priority valve utilized in a pressure and flow compensated variable displacement system which supplies priority flow to a priority motor and secondary flow to a secondary motor as long as the priority flow requirements are satisfied or the priority flow path is blocked. The priority valve utilizes the same flow control signal as the system pump including a fixed restriction in the signal line and a relief valve downstream of said restriction, set at a level below the maximum pressure level of the system so that when the priority motor is stopped, flow continues to the secondary motor.

Abstract: A dual air-oil separator which separates two air-oil mixtures of differing proportions in a single unit having first and second chambers for the separate mixtures. The two chambers are separated by a perforated partition wall. The air-oil mixture, high in air is separated as it passes from the first chamber through the perforated wall and into the second chamber. The second chamber directly receives the air-oil mixture, low in air, for separation and combination in its sump with the oil from the first chamber.

Abstract: 6.