| 摘要 |
A support leg (14) is attached to a ceiling structure (10) by means of a threaded stud (12) which mates with a threaded opening (18) in an insert (16) which is swage connected to the upper end of the support leg (14). A flat bar (22) is attached to the lower end of the support leg (14) so that it extends horizontally and makes a "T" with the support leg (14). An expansion clamp assembly (28, 36, 40, 44, 46, 50, 74) is carried by the bar (22). This assembly is plugged into the tubular lower end portion (26) of the support leg (14). Wing portions (58) of a nut wing washer (50) are deflected by the insertion of the assembly into the tubular portion (26), and edges (62) of the wings (58) are biased into a tight gripping contact with the inner tubular portion (26). This secures the nut wing washer (50) and a nut ( 46) against rotation. Then, the member (22) is rotated, relative to the support leg (14), causing a relative endwise movement of a stud (28) carried by the member (22) into the nut (46). This movement causes a cam surface (40) on a cam ring (36) to be moved against wings (66) on one or more main locking washers (44), in a direction deflecting the wings outwardly, and moving the edges (70) on the wings (66) into a tight metal displacing engagement with the inner wall of the socket (26). Rotation of the member (22) is continued until the member (22) is securely fastened to the support leg (14). A conical brace member (80) is provided at the upper end of the support leg (14) which is preloaded in compression.
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