Device at an energy accumulating piston-cylinder tool
AssigneeStromsholmen AB
InventorLeif Lundahl
Life of this patent
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Abstract
The present invention relates to an arrangement in an energy-accumulating piston-cylinder device (1, 2) having a piston (2) and a cylindrical casing (1). The invention is characterized by an openable safety valve (1) arranged in the piston (2) and/or a discharge duct (11) together with an element (8; 17) arranged on the cylindrical casing (1) or the safety valve (10) and in the cylinder chamber, which element is designed, in the event of the piston (2) being inserted into the cylinder chamber by more than a predetermined distance, to act upon the safety valve/the discharge duct (10, 11) in order to expose the said duct (11), permitting a discharge of the pressure in the cylinder chamber.
Claims9
An energy-accumulating piston-cylinder device comprising:
- a pistons, displaceable in a cylinder under the effect of pressure,
- a fluid-filled chamber, defined between the piston and the cyinder,
- a duct passing axially through the piston, providing a connection between the fluid-filled chamber and an open surrounding environment outside of the piston-cylinder device,
- a sealing part to prevent communication through the duct between the fluid- filled chamber and the open surrounding environment, and
- a pin element for interaction with the sealing part,
- wherein the sealing part and duct from a safety valve, which is arranged to relieve the pressure in the fluid-filled chamber when the piston, under the effect of pressure in excess of a predetermined valve, is inserted to a predetermined position in the cylinder, and
- wherein the pin element is arranged to act upon the sealing part when the piston is inserted to the predetermined position, to establish a discharge route via the duct between the chamber and the open surrounding environment.
Dependencies are inferred from the claim text.