Abstract: A gas cylinder actuator with overtravel indicator device, which includes a tubular containment jacket, an end face, an opposite annular guiding portion, a stem-piston arranged so as to pass through the annular guiding portion, wherein the stem-piston protrudes from the jacket in an axial direction, a chamber for pressurized gas being defined between the tubular jacket, the end face, the annular guiding portion for the stem-piston, an indicator device for indicating that overtravel for the stem-piston has occurred; and an annular body, which is inserted partially into a corresponding seat between the jacket and an annular portion so as to surround the outer lateral surface of an end portion of the annular guiding portion; the annular body rests in an axial direction on an element that protrudes radially within the jacket and is integral with the jacket.

Abstract: A gas cylinder actuator with safety device, which comprises: a tubular containment jacket, two opposing heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, a first head provided with a through hole for the passage of a stem-piston, and a second head provided with a gas filling duct, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas; the second head has a seat for the accommodation of a flow control element of the gas filling duct and corresponding sealing means, the flow control element comprising a tab for controlling a retracting stroke of the stem-piston, the control tab protruding from a body that has a lightened portion for triggering a controlled fracture or deformation in the event the control tab is crushed by the stem-piston.

Abstract: A gas cylinder actuator with safely device, comprising a tubular containment jacket, two opposite heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, a first head having a through hole for the passage of a stem-piston, and a second opposite head, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas, wherein at least one head of the two heads is constituted by a body that is separate with respect to the tubular jacket and is retained in the tubular jacket by means of an extraction-preventing shoulder that protrudes from the body of the head and is adapted to abut against a corresponding internal annular protrusion that protrudes radially from the internal surface of the tubular jacket.

Abstract: A gas cylinder actuator with overtravel safety device, comprising: a tubular containment jacket, two opposite heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, one head of which being provided with a through passage hole for a stem-piston, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas, the gas cylinder actuator being characterized in that the tubular jacket has, at at least one of the portions affected by a head, a lightened portion that is preset to be deformed in case of compression in an axial direction, allowing the relative axial movement of the corresponding head toward the inside of the tubular jacket so as to form a gas discharge passage between the jacket, the head and the corresponding sealing element.

Abstract: A gas cylinder actuator with safety device, which comprises: a tubular containment jacket, two opposing heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, a first head provided with a through hole for the passage of a stem-piston, and a second head provided with a gas filling duct, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas; the second head has a seat for the accommodation of a flow control element of the gas filling duct and corresponding sealing means, the flow control element comprising a tab for controlling a retracting stroke of the stem-piston, the control tab protruding from a body that has a lightened portion for triggering a controlled fracture or deformation in the event the control tab is crushed by the stem-piston.

Abstract: A gas cylinder actuator with overtravel indicator device, which comprises: a tubular containment jacket, an end face, an opposite annular guiding portion for a stem-piston, which protrudes from the jacket in an axial direction, a stem-piston arranged so as to pass through the annular portion, a chamber for pressurized gas being defined between the tubular jacket, the end face, the annular passage portion for a stem-piston and the stem-piston, a device for indicating that overtravel for the stem-piston has occurred; and an annular body, which is inserted partially into a corresponding seat between the jacket and the annular portion so as to surround the outer lateral surface of an end portion of the annular portion; the annular body rests in an axial direction on an element that protrudes radially within the jacket and is integral with the jacket.

Abstract: A gas cylinder actuator with overtravel safety device, comprising: a tubular containment jacket, two opposite heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, one head of which being provided with a through passage hole for a stem-piston, a stem-piston, between the tubular jacket, the heads and the stern-piston there being a chamber for pressurized gas, the gas cylinder actuator being characterized in that the tubular jacket has, at at least one of the portions affected by a head, a lightened portion that is preset to be deformed in case of compression in an axial direction, allowing the relative axial movement of the corresponding head toward the inside of the tubular jacket so as to form a gas discharge passage between the jacket, the head and the corresponding sealing element.

Abstract: A gas cylinder actuator with safely device, comprising a tubular containment jacket, two opposite heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, a first head having a through hole for the passage of a stem-piston, and a second opposite head, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas, wherein at least one head of the two heads is constituted by a body that is separate with respect to the tubular jacket and is retained in the tubular jacket by means of an extraction-preventing shoulder that protrudes from the body of the head and is adapted to abut against a corresponding internal annular protrusion that protrudes radially from the internal surface of the tubular jacket.

Abstract: A gas-actuated hold-down for punching devices comprising: a tubular containment body, a hold-down element, adapted to translate within the tubular body in order to protrude from and retract into a first end thereof, a tubular punch die-covering element, which is coaxial to the tubular body, for guiding the hold-down element, an annular closure body, designed to close the tubular containment body at an opposite second end thereof, a pressure chamber defined between the tubular body, the tubular punch die-covering element, the hold-down element and the annular closure body, a fixing flange, which widens radially from the tubular containment body at the second end thereof, the fixing flange having a through charging hole which extends in a radial direction with respect to a main axis of the hold-down, from a surface that is exposed in a configuration for use of the hold-down up to the pressure chamber.