Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Made up of plural expansible segments or sections
Patent
1980-01-07
1982-07-20
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Made up of plural expansible segments or sections
411 18, 411 34, 411 59, 411 62, F16B 1410, F16B 1314
Patent
active
043403301
ABSTRACT:
Disclosed is a straddling dowel, of plastic, having a continuous screw insertion hole and several expansion segments that are formed by longitudinal slits in the dowel body and which extend from the circular head portion to the circular foot portion of the dowel. In the latter part, a female thread can be cut by the inserted screw, thereby rendering axial expansion of the dowel body posible. The expansion segments are formed by overlapping annular plates or discs which, on spreading or axial expansion in the form of an increase in diameter or spreading move relative to each other over the whole extent of the contacting surfaces of adjacent plates or discs, which contacting surfaces run obliquely or conically to the axis of the dowel.
REFERENCES:
patent: 665705 (1901-01-01), Summerer
patent: 1316640 (1919-09-01), Parsons
patent: 1320622 (1919-11-01), Kennedy
patent: 1367080 (1927-11-01), Ogden
patent: 1599784 (1926-09-01), Osborne
patent: 1688087 (1929-01-01), Mirzan
patent: 2147357 (1939-02-01), Sholtes
patent: 3199398 (1965-08-01), Weisz
patent: 3381566 (1968-05-01), Passer
Holko Thomas J.
Tox-Dubel-Werk Richard W. Heckhausen KG
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