Stradling dowel
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United States of America Patent
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N/A
Issued Date -
Dec 2, 2004
app pub date -
Jan 22, 2004
filing date -
Aug 4, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The invention relates to an expansible fixing plug having a fixing plug sleeve and an expander screw (10). The invention proposes to align the rear (in the direction of screwing-in) flank (20) of a screw thread (18) of the expander screw (10) at a shallow angle of about 9.degree. relative to the axial direction of the expander screw (10) and to construct the screw thread (18) with a large thread pitch. In the event of the expander screw (10) being subjected to stress in the pull-out direction, the rear flank (20) acts in the manner of expander cones arranged one behind the other axially and expands the fixing plug sleeve. The expansible fixing plug exhibits subsequent expansion behaviour in the event of the drilled hole's becoming wider. In order to counteract unscrewing of the expander screw (10) from the fixing plug sleeve, the invention proposes longitudinally and radially aligned anti-unscrewing flanks (26) on the screw thread (18), which press into the fixing plug sleeve during expansion and thus prevent unscrewing of the expander screw (10) from the fixing plug sleeve.
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