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:
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 discloses an automatic loading machine adapted to load laboratory pipette racks (8) with pipette's tips stored in a bulk comprising: collecting means (1) adapted to contain at least a portion of said bulk; orientating means (2) , comprising a plurality of conduits directing the tips to move wherein their sharp dispensing orifice is directed towards the moving direction; at least one funnel, adapted to force a series of oriented tips to move perpendicularly towards a loaded rack; said pipette tip rack (8), adapted to slide along a rack plate (5); and, vibrating means (4) adapted to simultaneously orient said tips, move them towards the descending funnel, and actuate the rack on top of its plate. The present invention also discloses a method of loading pipette tips rack such that another one or more column and/or line of the bores of said pipette tips rack with tips until all bores are accommodated with tips.