Abstract: An accurate amount of a chemical concentrate is injected and mixed into a pressurized carrier liquid stream and dispensed by employment of two calibrated in-line valves in the line siphoning the concentrate to a siphon injector. The valves are so calibrated that the operator need only set the first in-line valve at the percentage of active ingredient in the concentrate and set the second valve at the percentage of active ingredient desired in the mixture to precisely reduce the flow rate of the concentrate in the siphon line and provide an accurately mixed finished liquid at the dispensing end of the system. Such a system is particularly adapted for use in the pest control industry.

Abstract: An energy attenuator for use with tensile or compressive loads is disclosed. The attenuator has two housings slidably fitted within one another. Relative motion of the two housings is opposed by a wire bending mechanism comprising a stiff wire and a trolley which bends the wire as it moves along the wire. The force required to move the housings is determined by the mechanical properties and size of the wire used and the orientation of the bearing surfaces of the trolley.

Abstract: A structure is provided for cooling the tail rotor gearbox of a single rotor helicopter having an anti-torque tail rotor mounted to a vertical stabilizer. The gearbox is mounted within the vertical stabilizer inside an air passage passing through the stabilizer. An air inlet is located in the vertical stabilizer on the side thereof opposite the tail rotor. An exhaust orifice is positioned in the vertical stabilizer on the same side of the stabilizer as the tail rotor. In operation the pressure differential over the vertical stabilizer caused by the rotation of the rotor causes ambient air to enter the inlet, pass through the passage, over the gearbox, and exit from the exit orifice thereby cooling the gearbox.

Abstract: A mechanism is provided for controlling the directional heading of a helicopter, particularly during hover and autorotation. In addition the mechanism provides additional thrust which enables the helicopter to increase its maximum velocity. The mechanism includes three nozzles with valves positioned therein, located in the rearward portion of the helicopter fuselage. Two of the nozzles are located on opposite sides of the aircraft fuselage to provide thrust for use in controlling the directional heading of the aircraft. This thrust is also used to counteract the torque generated by the driving of the lifting rotor of the helicopter. The third nozzle is positioned so that the thrust generated by it will increase the forward velocity of the helicopter. A propeller or fan located in the body of the aircraft forces air from intakes through the fuselage to the nozzles. The position of the valves is determined by suitable control linkage.

Abstract: A movable step assembly for use in mass transit vehicles to accommodate variations in passenger off and on loading facilities, said steps being movable from a conventional relation to permit on and off loading to street levels to an aligned, coplanar relation to permit on and off loading onto subway and other elevated platforms.

Abstract: A rotor pitch control mechanism for use with bearingless helicopter rotors is disclosed. The disclosed mechanism eliminates the requirement for vertical motion of the pitch link, thus alleviates the bearingless rotor problem of flapwise motion of the rotor blade in response to pitch control actuator forces. Stabilizing pitch-flap coupling and blade flap restraint is provided.

Abstract: A sewage treatment and recycling system is disclosed wherein effluent is initially treated in a septic tank and then flows over a perforated splash pan to be distributed evenly over a removable filter. The filtered effluent then passes through a second filter and into a holding tank from where it is pumped to a water tank and chlorinated before being sprayed over the land surface or used for other purposes.