Abstract: An electric valve including, housed within a valve body, a nut having a central shaft; a screw threadingly engaged within the nut and fixed thereto to prevent the nut from turning around the screw; and a seal mounted to the central shaft and configured to move freely with respect to the central shaft, both axially and rotatably there-about. The valve further includes sliding bearings disposed between the nut and the seal and disposed between the nut and a base of the screw; a lip correspondingly disposed with respect to the seal and reversibly engagable therewith. A projection is attached at a periphery of the nut; and a limiter is positioned in an inner side of the valve body, configured so that the projection is abuttable therewith. Due to the slide bearings, neither during opening of the valve or closing of the valve does the seal slide on the lip.

Abstract: An electric valve including, housed within a valve body, a nut having a central shaft; a screw threadingly engaged within the nut and fixed thereto to prevent the nut from turning around the screw; and a seal mounted to the central shaft and configured to move freely with respect to the central shaft, both axially and rotatably there-about. The valve further includes sliding bearings disposed between the nut and the seal and disposed between the nut and a base of the screw; a lip correspondingly disposed with respect to the seal 10 and reversibly engagable therewith. A projection is attached at a periphery of the nut; and a limiter is positioned in an inner side of the valve body, configured so that the projection is abuttable therewith. Due to the slide bearings, neither during opening of the valve or closing of the valve does the seal slide on the lip.

Abstract: A method for operating an assisting system for the disabled is disclosed. The assisting system includes a cushion, which includes a plurality of cushion chambers. The pressure in the cushion is measured by a pressure sensor. If the measured pressure is found to be above a threshold, a deflation of the cushion follows. Contrarily if the pressure is lower than the threshold, inflation of the cushion follows.

Abstract: A helicopter amusement apparatus, which enables hovering, climbing and descending, and flying back and forth in a play helicopter by force of muscles with excellent steering performance. The helicopter amusement apparatus is equipped with a hydraulic system, which enables positioning a balancing weight in a suitable location to obtain equilibrium according to the weight of the using pilot to enable lifting and driving the cockpit by means of a small force generated by a rotor activated by the power source of the pilot's feet.

Abstract: A helicopter amusement apparatus, which enables hovering, climbing and descending, and flying back and forth in a play helicopter by force of muscles with excellent steering performance. The helicopter amusement apparatus is equipped with a hydraulic system, which enables positioning a balancing weight in a suitable location to obtain equilibrium according to the weight of the using pilot to enable lifting and driving the cockpit by means of a small force generated by a rotor activated by the power source of the pilot's feet.

Abstract: The present invention provides an automatic loading machine adapted to load laboratory pipette racks with pipette's tips. The loading is performed by vibrations. The automatic loading machine comprises (a) collecting means adapted to contain said pipette tips; (b) orientating means in communication with said collecting means; said orientating means comprising at least one conduit adapted to direct said tips to move such that their sharp dispensing edge and/or their fitting opening is directed towards the direction of movement; (c) at least one plate having at least one funnel in communication with said orientating means, adapted to force said oriented tips to fall perpendicularly towards said pipette rack to be loaded; (d) said pipette tip rack in communication with said funnel, adapted to load said pipette's tip and to slide along a rack plate; and, (e) vibrating means adapted to simultaneously orient said tips to said orientating means; move them towards said funnel; and, actuate said rack plate.