Abstract: A gas-filled cylinder, with two concentric cylindrical bodies or tubes that determine an intermediate gas passage chamber and are separated by a shaft cap and a valve cap that allow the passage of gas towards the interior, in which a piston moves and forms two internal chambers. The gas passes from one chamber to the other when the valve shaft is operated. This valve shaft is of considerable length and can be operated by small movements.

Abstract: A double liner gas cylinder with a straight-walled internal gas cylinder, housed inside a longer tube with an extend area housing outer bushing held in position by an outer tube.

Abstract: Gas cylinder with two concentric bodies and an intermediate chamber, with a control rod and gas passage valve that withstands multidirectional drive action, enabling the drive action on an area that resembles a semi-sphere and with the direction in which the executing force of the control action is applied proving immaterial, as it can be either on the rod itself or on a device attached to its end with a blind hole or through hole.

Abstract: A double liner gas cylinder with a straight-walled internal gas cylinder, housed inside a longer tube (14) with an extend area (16) housing outer bushing (25) held in position by an outer tube (26).

Abstract: A gas-filled cylinder, with two concentric cylindrical bodies (1, 2) that determine an intermediate duct (3) and are separated by a shaft cap and a valve cap that allow the passage of gas towards the interior, in which a piston (6) moves and forms two chambers (4, 5). The gas passes from one chamber to the other when the valve shaft (13) is operated. This valve shaft is of considerable length and can be operated by means of small movements.

Abstract: A position adjustment device, in particular for bicycle saddles (A), that combines a set of tubes with a gas-filled cylinder (49), forming a non-turning assembly. This assembly is connected with a base (1) which is secured to the saddle, including an operating lever on the valve shaft (39) of the gas-filled cylinder that causes the saddle to be raised and/or lowered.

Abstract: Gas shock-absorber including two concentric tubes with an intermediary chamber and valve plug, and with a shaft of which the head separates two internal chambers, at which extremity is connected the body to the shock-absorber. The valve plug has to parts in direct contact between each other; the sliding of part in the external tube takes place by a seal situated between an upper metal washer and a slot of the part. The washer has a central neck which is introduced into the cavity of part. The other part of the valve plug has cavities which are intended to reduce its weight. The head of the shaft which separates the internal chambers is made of plastic and presents an upper countersunk part wherein is housed an annular seal; a washer is provided on top of the head and the assembly is riveted.

Abstract: A gas cylinder with an outer steel tube which has its lower end of a smaller diameter. Into the upper end of the tube a plastic bushing provided with longitudinal radial ribs is inserted under pressure. This bushing has two annular reinforcing portions separated a certain distance from each other, with the ribs being situated further back in this separation, so that staggered housings are produced all around the profile, in which hook-type fins are received, with semi-punched material on the wall of the tube. At the lower end, an inverted bowl is placed, with its edge supported on a flange on the end of the tube.

Abstract: A gas cylinder with a valve plug made of two parts (4,5), which are fitted together by pressure. Of the two parts, the lower one (5) has an outer slot (7) with three sharp angles in it, which communicates the inter-cylinder space with the gas intake valve upwards of the piston. The intake valve shaft finishes at its lower end in a washer, which has a upper ring-shaped rabbet or offset. With this cylinder, the rate of flow of the gas is regulated and a greater safety margin is obtained in its operation.