Patent ID: 9157500
Filing Date: 2015-10-13
Classification: B21D,F16F

Abstract:
1. A gas cylinder actuator with a safety device for controlled ejection of the piston stem, comprising a tubular jacket for gas containment, which is closed hermetically at one end by a bottom provided with a gas filling valve and at an opposite end by a head portion which is provided with a hole for the passage of a stem with a piston, said jacket, said bottom and said piston defining a gas compression and expansion chamber, said gas cylinder actuator having, on a side of a region for fixing the head portion to the jacket, a region in low relief on an inner face of the jacket, designed to interrupt the seal provided selectively either by the gasket means associated with said piston or by the gasket means associated with said head portion, and normally operating against said inner face of the jacket, in case of separation of said head portion with an outward movement of said piston, wherein said bottom is provided with a gas filling valve, and in that said head portion is constituted by an annular gasket supporting body and by a closure ring, to be screwed onto a corresponding threaded collar of the annular body so as to lock it, said annular body being retained in the jacket by a locking ring, which is inserted so as to protrude in an annular slot formed on the inner face of the jacket proximately to the end portion of said jacket, said ring, on the opposite side, being pressed into a perimetric hollow formed in the annular body, and wherein a weakened portion is located between the inner annular slot for the locking ring of the annular body and an external slot provided on the outer surface of the jacket at said inner annular slot.