| 摘要 |
PCT No. PCT/AU85/00002 Sec. 371 Date Aug. 28, 1985 Sec. 102(e) Date Aug. 28, 1985 PCT Filed Jan. 3, 1985 PCT Pub. No. WO85/03112 PCT Pub. Date Jul. 18, 1985.An adjustable arm having a plurality of sections joined together by a ball and socket joint comprising a housing, a ball retained within the housing, a concave cup slidably mounted within the housing with clearance between the cup and the ball, a locking member slidably mounted in a recess in the ball so that one end projects beyond the ball and bears against the concave face of the cup a push rod passing through the section so that one end bears against the cup adjacent one end of the section and the other end bears against the locking member of the joint adjacent the other end of the section and means for applying a compressive force to the push rod to simultaneously lock all joints against relative movement. |
