| 摘要 |
An expansion sleeve for insertion into a hole of a support structure is configurated as a helical wire spring whose adjacent convolutions abut one another. In a portion of the spring which extends from the trailing towards the leading end thereof, the abutting convolutions are connected with one another by soldering, bonding, welding, or the like, so as to be immovable relative to one another. An expander element is located at the leading end and an actuator screw extends from the trailing end through the spring to the leading end where it engages the expander element so as to draw the same into the screw towards the trailing end. |
