| 摘要 |
<p>A crutch, walking stick or the like with steplessly adjustable length, and comprising an outer tube (1) with at least one inner tube (2) which can be displaced outwards and inwards telescopically by means of a gas spring in the lower end. To counteract resilience during the use of the crutch as a consequence of a gas compressibility, the inner tube (2) is divided into two chambers (25, 26) with a sliding piston (8) and filled with a liquid. The piston (8) is influenced by a gas spring (10) disposed in the bottom of the inner tube (2). The piston (8) is secured to a hollow piston rod (3) in which there is disposed a valve spindle (17). The end of the valve spindle (17) carries a valve cone (18) for the closing of a passage through the piston (8) from the one chamber to the other in the outer tube (2). The valve is spring-loaded (21) for closing, and can be influenced by a release mechanism (23). By opening the valve, the length of the crutch can be adjusted in a stepless manner.</p> |
