Abstract: A fastener for connecting plate members includes a male member, and a female member to be inserted into mounting holes of the plate members. The female member includes a cylinder body for receiving the main body therein, a projecting portion formed on an outer periphery of the cylinder body at one end thereof, and protruding portions formed at the other end thereof. A first engaging portion is formed on an outer surface of a main body of the male member or an inner surface of the cylinder body, and a second engaging portion engaging the first engaging portion is formed on the inner surface or the outer surface. The second engaging portion has two engaging sections and a smooth surface portion interposed therebetween. When the male member is inserted into the female member, the male member can be easily engaged with the female member.

Abstract: A fastener for connecting plate members includes a male member, and a female member to be inserted into mounting holes of the plate members. The female member includes a cylinder body for receiving the main body therein, a projecting portion formed on an outer periphery of the cylinder body at one end thereof, and protruding portions formed at the other end thereof. A first engaging portion is formed on an outer surface of a main body of the male member or an inner surface of the cylinder body, and a second engaging portion engaging the first engaging portion is formed on the inner surface or the outer surface. The second engaging portion has two engaging sections and a smooth surface portion interposed therebetween. When the male member is inserted into the female member, the male member can be easily engaged with the female member.

Abstract: A bent axis type axial piston pump or motor wherein the cylinder block is rotatable in synchronizm with the torque plate about an axis inclined relative to the axis of rotation of the torque plate. The shaft of the torque plate passes through the inclined cylinder block without mutual mechanical interference and is supported by bearings at the opposite sides of the casing. The torque plate and the cylinder block are connected by a mechanism which ensures exact synchronization of rotation of the two members. A static pressure balance is established between the working fluid acting on the opposite sides of the torque plate, the cylinder block and the pistons, respectively. The angle of inclination of the cylinder block with respect to the shaft can be changed thereby to change the capacity of the pump or motor. The pump or motor of this invention may be provided in a tandem type.