| 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 (20) 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 (22) is carried by the bar (20). This assembly (22) is plugged into the tubular lower end portion (24) of the support leg (14). The uppermost part of the assembly (22) is a T-nut (48). The head (50) of the nut (48) includes a plurality of struck out barbs (76) having points (74) which penetrate into and grip the inner sidewall of the socket (24) when the assembly (22) is inserted into the socket (22). This secures the nut (48) against rotation. Following insertion, the member (20) is rotated, relative to the support leg (14), causing a relative endwise movement of a threaded rod (30), carried by the member (20), into the nut (48). This movement causes a cam surface (40) on a cam member (36) to be moved against wings (58) on one or more lock washers (54), in a direction deflecting the wings (58) outwardly. This deflection moves the edges of the wings (58) into a tight displacing engagement with the inner wall of the socket (24). Rotation of member (20) is continued until the member (20) is securely fastened to the support leg (14).
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