Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Sleeve type with longitudinal slot – slit – or split expanded...
Patent
1997-09-29
1999-11-30
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Sleeve type with longitudinal slot, slit, or split expanded...
411 71, 411 43, 411 601, F16B 1306
Patent
active
059931299
ABSTRACT:
A bolt anchoring device for insertion into a bore in a concrete ceiling or the like material is provided. The bolt anchoring device comprises an anchor sleeve and a bolt. The anchor sleeve is first inserted in the bore for its provisional or temporary attachment. The bolt is then screwed into the anchor sleeve for permanent attachment of the anchor sleeve and the bolt. In one embodiment, the bolt is removable after permanent attachment of the anchor sleeve. The anchor sleeve has a self-retaining means for retaining itself in the bore at the time of its provisional or temporary attachment. The anchor sleeve has a first end portion having a threaded hole and a second end portion having a plurality axial slits. The bolt has an integral plug portion which is pushed into the second end portion to expand the second end portion and make it cut into an inner wall surface of the bore for thereby firmly securing the anchor sleeve in the bore. The plug portion is generally cylindrical and uniform in diameter so that it is hardly removed from the second end portion of the sleeve when once pushed into the second end portion. In one embodiment, the plug portion is twisted off from the bolt when the bolt is twisted by a torque larger than a predetermined value so that the bolt can be removed after permanent attachment of the anchor sleeve.
REFERENCES:
patent: 4135432 (1979-01-01), Schlage
patent: 4259890 (1981-04-01), Walsh
Kabushiki Kaisha Youma Kohboh
Saether Flemming
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