Abstract: A piston device for a piston cylinder unit comprises a rod and a piston which is secured by means of plastic forming onto the rod.

Abstract: A length-adjustable piston cylinder unit comprises a casing; a guide and sealing unit; a piston rod; a piston; a first interior portion; a second interior portion which faces away from the first interior portion; an adjustment valve; a guide sleeve which is arranged for displacement on the casing, the guide sleeve being secured to the piston rod at a sleeve end and comprising at least one latch opening which is spaced from the sleeve end along the central longitudinal axis; and a latch sleeve arranged on the guide sleeve, the latch sleeve comprising a latch protrusion for engagement into the latch opening, with the latch protrusion of the latch sleeve being arrangeMc in the latch opening of the guide sleeve for arranging the piston cylinder unit in a secured position so that the displaccability of the guide sleeve connected with the piston rod relative to the casing is blocked.

Abstract: A length-adjustable piston cylinder unit comprises a casing which is filled with a fluid and has a central longitudinal axis; a guide and sealing unit which seals off the casing at a first end; a piston rod which is guided through the guide and sealing unit out of the first end of the casing in a sealed manner; a piston which is connected with the piston rod and is guided in the casing in a sealed manner; a first interior portion which is bounded between the piston and the guide and sealing unit; a second interior portion which is bounded by the piston and faces away from the first interior portion; an adjustment valve arranged in the piston for optionally connecting the two interior portions to each other; a guide sleeve which is arranged for displacement on the casing and is concentric to the central longitudinal axis, the guide sleeve being secured to the piston rod at a sleeve end and comprising at least one latch opening which is spaced from the sleeve end along the central longitudinal axis; and a latch

Abstract: An adjustable-height chair column comprises an upright tube and a gas spring that is disposed coaxially in the upright tube. The gas spring comprises a valve for actuation of the gas spring. This valve is embodied for opening upon relief of the casing of the gas spring in relation to the upright tube.

Abstract: An adjustable-height chair column comprises an upright tube and a gas spring, the piston rod of which is fixed in the upright tube, and the housing of which is displaceably guided in the upright tube. A safeguard against rotation is provided which, in the extended position, locks the housing and the upright tube against rotation.

Abstract: An adjustable-height chair column comprises an upright tube and a gas spring, the piston rod of which is fixed in the upright tube, and the housing of which is displaceably guided in the upright tube. A safeguard against rotation is provided which, in the extended position, locks the housing and the upright tube against rotation.

Abstract: An adjustable-height chair column comprises an upright tube and a gas spring that is disposed coaxially in the upright tube. The gas spring comprises a valve for actuation of the gas spring. This valve is embodied for opening upon relief of the casing of the gas spring in relation to the upright tube.

Abstract: A compression spring comprises a casing with a piston that is mounted on a piston rod being disposed for displacement therein. Two sectional casing chambers are provided in the casing, which are filled with pressure fluid and at least one of which is defined by the piston. A controllable first valve interconnects the sectional casing chambers in an open position and blocks the compression spring in a shut-off position. By way of an additional automatic valve between the sectional casing chambers, the compression spring, even when blocked, can be adjusted in the piston-rod push-out direction by a force being applied that is comparable to the push-out force that works in the push-out direction by the pressure of the pressure fluid. This provides for greater flexibility in use of the compression spring.

Abstract: A longitudinal adjusting element has a housing (1) which is filled with a pressurizing medium and in which a piston (12) including a piston rod (16) is guided displaceably. The housing chambers (13,14) which are separated from each other by the piston (12) can be connected with each other or separated from each other with the assistance of a valve device (17). The valve device (17) has at least two overflow ducts (16,40) [sic. (26,40)] which have different throttling effects and which take effect jointly or successively while valve pin (29) is slid in to varying extents.