Improvements in or relating to extendable legs for stands or similar appliances

摘要

PCT No. PCT/GB97/00227 Sec. 371 Date Mar. 4, 1999 Sec. 102(e) Date Mar. 4, 1999 PCT Filed Jan. 24, 1997 PCT Pub. No. WO97/41383 PCT Pub. Date Nov. 6, 1997An extendable leg for a stand or similar appliance having elongate members (13,14,15) interconnected to extend and retract with respect to each other includes a first member (13), intermediate member (14) and a final member (15). The intermediate and final members have releasable locking devices (16,17,18) adjacent to one end of the leg engagable with the first and intermediate members respectively. Remote release devices (19) are provided for releasing the locking devices from the other end of the leg to permit when released, the first member to the extended with respect to the intermediate member and the intermediate member to be extended with respect to the final member. A further locking device (20,22,24) is provided between the intermediate and final members and is arranged to be released automatically on full extension of said first member with respect to the intermediate member to release the intermediate member for extension with respect to the final member for full extension of the leg and to re-engage automatically on completion of retraction of the intermediate member with respect to the final member.