Title:
SCREW HAVING UNDERSIDE CUTTERS AND POCKETS
Document Type and Number:
WIPO Patent Application WO/2011/032259
Kind Code:
A8
Abstract:
A screw has a generally flat washer-like head. On an underside of the head are a plurality of cutters or cutting wedges arranged circumferentially around the shank of the screw. The cutters cut or carve off material when the screw is inserted into a fibrous material like wood to thereby facilitate countersinking of the screw head. The cutters may be triangular or quadrilateral wedges. One or more pockets are disposed radially inwardly of the cutters for receiving fibrous material to help lock the screw in place, i.e. to prevent the screw from loosening over time. These pockets may circularly shaped pockets disposed circumferentially around the shank. Alternatively, a single annular pocket may be provided around the shank.
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Inventors:
WALTHER MIRCO (CA)
Application Number:
PCT/CA2010/000838
Publication Date:
April 12, 2012
Filing Date:
June 04, 2010
Export Citation:
Assignee:
WALTHER MIRCO (CA)
WALTHER ULRICH (CA)
WALTHER GERDA (CA)
WALTHER ULRICH (CA)
WALTHER GERDA (CA)
International Classes:
F16B25/10; F16B25/02; F16B25/08; F16B39/282
Attorney, Agent or Firm:
ROY, Matthew (160 Elgin Street Suite 260, Ottawa Ontario K1P 1C3, CA)
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