Patent ID: 8714074

Claim:
A length-adjustable piston cylinder unit comprising a. a casing ( 2 ) which is filled with a fluid and has a central longitudinal axis ( 3 ); b. a guide and sealing unit ( 10 ) which seals the casing ( 2 ) at a first end ( 9 ); c. a piston rod ( 7 ) which is guided through the guide and sealing unit ( 10 ) out of the first end ( 9 ) of the casing ( 2 ) in a sealed manner; d. a piston ( 8 ) which is connected with the piston rod ( 7 ) and is guided in the casing ( 2 ) in a sealed manner; e. a first interior portion ( 13 ) which is bounded between the piston ( 8 ) and the guide and sealing unit ( 10 ); f. a second interior portion ( 14 ) which is bounded by the piston ( 8 ) and faces away from the first interior portion ( 13 ); g. an adjustment valve ( 17 ) arranged in the piston ( 8 ) for optionally connecting the two interior portions ( 13 , 14 ) with each other; h. a guide sleeve ( 27 ) which is arranged for displacement on the casing ( 2 ) and is concentric to the central longitudinal axis ( 3 ), the guide sleeve ( 27 ) i. being secured to the piston rod ( 7 ) at a sleeve end ( 28 ); ii. comprising at least one latch opening ( 30 ) which is spaced from the sleeve end ( 28 ) along the central longitudinal axis ( 3 ); and i. a latch sleeve ( 34 ) arranged on the guide sleeve ( 27 ), the latch sleeve ( 34 ) comprising at least one latch protrusion ( 35 ) for engagement into the at least one latch opening ( 30 ), with j. the at least one latch protrusion ( 35 ) of the latch sleeve ( 34 ) being arrangeable in the at least one latch opening ( 30 ) of the guide sleeve ( 27 ) for arranging the piston cylinder unit ( 1 ) in a secured position so that the displaceability of the guide sleeve ( 27 ) connected with the piston rod ( 7 ) relative to the casing ( 2 ) is blocked.