Abstract: An operating force controlling device includes a pair of reactive force mechanisms (70, 70') disposed in an opposing relationship to each other in the direction of operation of an operating lever (60). A load pressure of a motor (30) is detected by a detector (91, 91'), and a controlling signal is outputted from a controller (90) in response to the load pressure. A pilot pressure is outputted from an electromagnetic proportional pressure reducing valve (80) in response to the control signal. The pilot pressure is inputted into one of the chambers of the reactive force mechanisms (70, 70') which moves a rod (72, 72') to project, to apply an operation reactive force to the lever (60). The operation reactive force is controlled such that the rate of change thereof may be high when the load pressure of the motor (30) is low but may be low when the load pressure is high.

Abstract: A reverse rotation preventing device for a Diesel engine which can stop, when the engine exhibits a stopping tendency, operation of the engine to prevent reverse rotation of the engine with certainty and can automatically release a stopping interlock after stopping of the engine.

Abstract: A detent device for a control lever includes a cam which moves integral with a control lever by operation of the control lever. A piston is mounted such that the state wherein the end thereof comes into sliding contact with the cam, during movement of the cam, a pressure chamber is formed to communicate with a part of the piston opposite the sliding surface. A spring is provided within the pressure chamber to bias the piston toward the cam. The cam is provided with a detent portion in a part of the surface with which the piston contacts the detent portion. The sliding resistance of the end of the piston is greater at the detent position of the control lever, than at the other locations. A detector detects that the end of the piston is positioned at said detent portion. An oil-pressure supply device supplies oil pressure to the pressure chamber on the basis of a detection signal from the detector. The detector includes an electric contact constituted by a piston and a cam.

Abstract: A polycrystalline ferrite containing Na, Zr and Ca in amounts of 0.01 to 0.5% by weight, 0.005 to 0.5% by weight and 0.01 to 0.5% by weight respectively, in Mn-Zn or Ni-Zn ferrite to thereby enhance the toughness of said ferrite. Said ferrite is suited for a magnetic head with improved mechanical strength and excellent fine workability.

Abstract: A centrifugal potting apparatus has one or more rotators for holding housings filled with hollow semi-permeable filaments. Potting agent containers with radially-directed outlets are mounted on the rotators. Tubing connects the container outlets to potting case inlets at the ends of the filament-filled housings. Centrifugal forces during rotation force the potting agent through the tubing and into the ends of the housings.

Abstract: A method for bonding steel plates with a polyamide adhesive, comprising applying a composition comprising (1) a polyester resin comprising the reaction product of (a) a polycarboxylic acid component comprising at least one of a polycarboxylic acid, an anhydride thereof, an ester thereof or a mixture thereof with (b) a polyhydric alcohol component comprising at least one polyhydric alcohol or a mixture thereof, with at least some of one of the polycarboxylic acid component and the polyhydric alcohol component being trivalent or higher, and (2) a bisphenol A-type epoxy resin, on a steel plate; baking the coating by heating; juxtaposing the coated steel plates to be bonded with a polyamide adhesive therebetween; and bonding the steel plates with the polyamide adhesive, a primer composition for use therein and a polyester resin for use in the primer composition.