Patent ID: 6934996

Claim:
Gas-filled cylinder including an outer tube, an inner tube, an intermediate gas passage chamber between the tubes, a valve shaft, a valve cap, a shaft cap, a cylinder shaft with a piston dividing the inter tube into two internal chambers where an outer end of the valve shaft protrudes to an exterior of the cylinder so that the cylinder can be operated from the exterior, and an inner end of the valve shaft passes through a cavity of the valve cap and; is connected to a dynamic ring seal and a washer, where the cylinder, where operated, allows the gas to pass from one internal chamber to the other internal chamber through the intermediate gas passage chamber and through the valve cap and the shaft cap, said gas-filled cylinder comprising the valve cap including an upper part, a middle part and a lower part, and an inner diameter of the cavity is greater than a diameter of the valve shaft, and the parts house an inner ring seal that adjusts the valve shaft, and when the cylinder is at rest, the valve shaft avoids contact with the valve cap, the washer makes complete contact with a front of the lower part of the valve cap, and the dynamic ring seal is housed in a trunco-conical housing in the lower part, whereas when the cylinder is operated, the washer separates at least partially from the front of the lower part of the valve cap, and the dynamic ring seal separates at least partially from the trunco-conical housing of the lower part, creating a gas passage.