| 摘要 |
A support, such as a monopod for a camera, comprises a telescopic member (6) having an inner portion (8) slidably movable within an outer portion (9). Retaining means (18) locks the portions at any selected relative position between the fully collapsed and fully extended conditions of the support, but is prevented by jam prevention means (62) from locking the portions at the fully extended position. The release of the retaining means requires the slight extension of the telescopic member, and the jam prevention means, therefore, prevents the retaining means from jamming the telescopic member in its fully extended condition. A preferred form of retaining means comprises a sleeve (26) which has apertures for accommodating ball bearings (e.g. 34) which are urged against the outer portion (8) by camming members to lock the outer and inner portions in a selected position. The sleeve (26) has a circlip which partially occludes the apertures to retain the ball bearings therein. The sleeve and ball bearings can thus be formed as an initially separate subassembly. |
