Abstract: A balanced vane hydraulic pump designed for automotive power steering applications employs a multi-vane rotor and cam ring. The pump has a three-piece aluminum housing construction, with the flow regulating valve located in the rear housing section, the cam ring and rotor located in the center housing section, and a two bearing sets located in the front housing section for supporting the pump drive shaft from one end only. The rear housing section also preferably includes a semi-flexible inner wall which under high pressure conditions bows inwardly toward the cam ring, rotor and vanes, thereby helping to maintain operating clearances so as to relatively help control leakage under varying pump output pressures, even though separate pressure and thrust plates are not used.

Abstract: An alarm system for generating an alarm from a remote location and which utilizes electronically generated codes to access selected functional portions of the alarm system circuitry and which further utilizes a locking transmitter which must be reset after a single use thereof before the transmitter may be re-used, the transmitter resetting being achieved by means accessible only to authorized personnel. A method for providing personnel security utilizing a defined area grid to identify a location which may be entered into a portable transmitter. When a person determines a need for assistance, the location code is transmitted by radio signal to receivers placed at corresponding grid locations, which receivers send an alarm signal to summon help and simultaneously activate security lighting or audible annunciators.

Abstract: A nut for attaching an automobile wheel to a hub, having a decorative and protective cap. The nut has a first conical section engageable with the wheel and a second conical section against which the inner end of the cap is crimped. The second section is shallower than the first, and they are interconnected by a notch formed by a reversely conical surface extending transversely to the two conical sections and of a depth at the flat which is approximately equal to the metal thickness of the cap. The result is a construction which creates a strong, thickened retaining collar around the cap and affords a more secure assembly which resists impact wrenching forces.