Abstract:
A wobble plate compressor, which is adapted to vary the angularity of the wobble plate in response to the difference between the resultant reaction force exerted by the pistons on their compression strokes and the pressure in the crankcase, includes elastic means permanently biasing the wobble plate in the angularity-decreasing direction, and control valve means responsive to a signal indicative of at least one predetermined parameter to selectively connect the crankcase with a suction pressure space and a discharge pressure space for a rapid change in the pressure in the crankcase to thereby achieve control of the angularity of the wobble plate with high responsiveness.
Abstract:
A storage rack entry vehicle for transporting loads of substantial weight in a warehousing system includes a plurality of wheels spaced from each other in the direction of both the length and the width of the vehicle and which support the vehicle for movement upon rails. The vehicle also includes an elevatable platform which supports the loads on the vehicle and distributes the load weight to locations adjacent each of the wheels. A rigid plate connects both the wheels and the load supports. However, this rigid plate is sufficiently flexible such that the plate flexes to maintain all of the wheels in continuous contact with the rails where one of the rails may vary in elevation such that at least one of the wheels might otherwise move out of contact with the rail surface.
Abstract:
A method of, and bolt for, supporting a structure such as a mine or tunnel roof or side wall or the like. The method typically comprises providing an elongate annular anchoring bolt defining a central longitudinal passage therethrough and having cutting edges in an inwardly extending region at its leading end and in outwardly protruding areas at spaced positions along and around its outer surface for cutting into the structure to be supported, and openings in the bolt adjacent to at least some of the cutting edges for permitting material that is cut away from the structure to proceed into the central passage and out through its trailing end, the outer diameter of the bolt being smaller at its leading end and progressively larger along its length to the trailing end, pressing the leading end of the bolt against a surface of the structure to be supported, applying axial and rotational forces against the bolt to drive its cutting edges against and into the structure along approximately parallel helical paths and to penetrate into the hole formed by the cutting until only a short minor portion of the bolt remains outside of the structure, and then applying a final axial force against the bolt sufficient to upset inwardly a portion of the bolt at its leading end and to drive the remaining portion of the bolt at the trailing end into the hole.