Abstract: An electromagnetic revolutionary piston pump is disclosed. The electromagnetic revolutionary piston pump includes an inner tube, an outer tube, two annular separation plates, a plurality of pistons, and an electromagnetic coil. The inner tube has a plurality of first and second through holes, and it accommodates the abovementioned pistons to revolve inside. The outer tube has an intake opening and an exhaust opening, and it wraps the inner tube inside. In addition, the annular separation plates are disposed inside the outer tube for dividing the inner space of the outer tube into a first airproof space and a second airproof space. The first airproof space connects the intake opening and communicates the inner space of the first tube via the first through holes; the second airproof space connects the exhaust opening and communicates the inner space of the first tube via the second through holes.

Abstract: A sliding door and a safety device thereof are described. The sliding door is opened and closed parallel to a body of a car to reduce efficiently the width requirement for opening a car door. The sliding door has a door body, a power transmission device, and a supporting device. The supporting device supports the sliding door and couples the power transmission device to the body of the car by way of only one end portion of the door body. The sliding door further has a handle and a safety device to enhance effectively driving safety.

Abstract: A pump. The pump includes a housing, a conductor, a first coil and a second coil. The housing has an intake and an output. The conductor is movably disposed in the housing. The first coil generates a magnetic force attracting the conductor toward the output when electrified such that fluid therebetween flows out of the housing. The second coil generates a magnetic force attracting the conductor toward the intake when electrified such that fluid therebetween flows between the conductor and the output.