Abstract: A pump includes a pump chamber, a reciprocally, driven body that is moved to perform a pumping function by changing the capacity of the pump chamber, and a driving mechanism that reciprocally moves the driven body. The driving mechanism includes a rotating plate which is fixed to an output shaft of a motor and has an annular groove therein. A ball is sandwiched between an annular groove of a driving plate and the annular groove of the rotating plate. When the rotating plate begins rotating, the ball moves in the annular grooves and changes the inclined direction of the driving plate, thus, causing the driven body to reciprocate.

Abstract: A pump which performs a pumping function by reciprocally moving a piston by driving a connecting rod so as to maintain a pump chamber in an airtight condition with a diaphragm sandwiched between a piston disposed on a side of a pump chamber and the connecting rod, wherein the diaphragm has a planar plate like form as a whole and a curved portion which is transformed around the piston so as to be brought close to the piston.

Abstract: An impeller pump which can be connected for use with hot-water serving systems. By the rotation of an impeller, liquids are sucked through a suction port which is connected with a container of the hot-water serving system and discharged through a discharge port for the intended supply. A guide port is provided nearby the suction port to let escape bubbles from the pump chamber, thereby assuring that the hot-water supply capacity performance is kept constant.

Abstract: A small-sized pump comprising a common valve chamber, a plural number of pump chambers respectively arranged round the common valve chamber and each having a diaphragm, a drive member provided in the inclined state and serving to move the diaphragms upward and downward, and a tubular supporting member extending obliquely downward from the central portion of the drive member, the small-sized pump being arranged to make the end of the tubular supporting member perform circular motion and to thereby drive the drive member so as to move the diaphragms upward and downward so that respective pump chambers perform pumping actions with a predetermined time lag, the small-sized pump being thereby arranged to have high pumping efficiency.