| 摘要 |
An adjustment device has a foot ring (10), a first positioning unit (20), a second positioning unit (30) and a tightening collar (40). The foot ring (10) has a mounting tube (11) with a block which protrudes from an inner surface of the tube to abut a positioning unit. The first positioning unit (20) and the second positioning unit (30) are mounted in the mounting tube (11) and respectively have an inner threaded portion (22). The inner threaded portions (22) are connected with each other to form a tapered threaded structure. The tightening collar (40) is tapered and engages with the threaded structure formed by the inner threaded portions (22). The adjustment device is designed to be mounted on a vertical spindle 51 of an office seat. The positioning units may be joined using a cooperating recess 21 and bump 31 and the collar may have four slits and an annular flange which abuts the positioning units. |
