Importance

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Abstract

A cylindrical chamber full of oil, without any valves or inlet/exit ports for this oil. A piston travels in said sealed cylindrical chamber with a rod on either side, assembled with sealing rings and provided with a series of peripheral axial holes all of the same diameter and equidistant from the piston axis. On the rod anchored to the ram slides a plunger disc supported directly under the piston assembly by two diametrically opposed threaded studs with large heads. Said studs are first threaded through the piston assembly and then screwed through the two holes found on the plunger disc. The upward travel of this disc which stops under and against the piston holes, is prevented each time the dual push-button control is operated since, when operating, these buttons, besides starting the movement of the ram, prevents the upward travel of the plunger disc simultaneously. Included is a slider which, via a pneumatic cylinder installed at the top of the upper piston rod, is lowered and pressed on to the large heads of the two aforementioned studs thereby preventing their upward movement. Should the ram descend accidentally this mechanism does not operate; thus the plunger disc may rise and close off the holes on the piston. Consequently the incompressible oil enclosed and compressed in the lower cylinder chamber provides for the instant arrest of the piston assembly movement and therefore also that of the ram anchored to the rod.

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First Claim