Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1979-01-15
1981-04-07
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
F16B 1304
Patent
active
042598907
ABSTRACT:
A removable anchor assembly has an elongated hollow tube including integral upper and lower portions with at least the lower portion exhibiting resilience to lateral deflection of segments of the walls thereof. The lower portion normally changes in a diameter progressively from near the junction with the upper portion, and the upper portion generally has predetermined internal and external diameters. Longitudinal slots are spaced around the lower portion, and a laterally facing ridge on the lower portion has a normal diameter related to the exterior diameter of the upper portion. A rigid plug is movable through the upper portion and has a diameter functionally the same as that of the internal tube diameter at the upper end of the lower portion. The plug is insertable within the lower portion to wedge the walls thereof outwardly and expand the ridge diameter to an enlarged amount. The plug later may be engaged so as to permit its withdrawal and consequent contraction of the ridge in an amount to enable removal of the anchor from an opening in which it has been secured. One approach at construction forms the ridge and the tapering by means of tool and die operations, another specific approach involves the use of thread rolling, and a third approach is by way of cutting or punching operations.
REFERENCES:
patent: 1000715 (1911-08-01), Caywood
patent: 1816970 (1931-08-01), Hess
patent: 2370327 (1945-02-01), Rosan
patent: 2438533 (1948-03-01), Booth
patent: 2448351 (1948-08-01), Brush
patent: 2707897 (1955-05-01), Beeson
patent: 3143917 (1964-08-01), Conner
patent: 3606814 (1971-09-01), MacKenzie
patent: 3618135 (1971-11-01), Weller
patent: 3808938 (1974-05-01), Chromy
patent: 4135432 (1979-01-01), Schalge
Drake Hugh H.
Holko Thomas J.
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