Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1997-12-16
1999-07-13
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
411 57, 411 29, F16B 1306
Patent
active
059217332
ABSTRACT:
A self-cutting, undercutting dowel (1) is formed of an axially extending anchor rod (2) with a head part (3) leading in a setting direction (S) of the dowel and an axially extending sleeve (5) laterally enclosing the anchor rod (2). At its end facing in the setting direction, the sleeve (5) has expansion sections (7) separated from one another by axially extending slots (6). The sleeve (5) can be driven over the head part (3) relative to the anchor rod (2) so that the expansion sections (7) flare radially outwardly. At least one of the expansion sections (7) has a tooth shape at its end facing in the setting direction forming a cutting edge (10) for cutting an undercut in a receiving material for the dowel. The cutting action is effected by rotating the sleeve (5). The cutting edge (10) is located at a side edge (11) of the expansion section (7) leading in the rotating direction (R) of the sleeve (5) and the cutting edge is inclined to an axis (A) of the sleeve at a first angle (.alpha.). The expansion section (7) with the cutting edge (10) has a trailing side edge (12) inclined relative to the axis (A) of the sleeve (5) at a second angle (.beta.). The sum of the two angles (.alpha.,.beta.) is less than 160.degree..
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European Search Report, No. EP 97 810 943.7 dated Mar. 12, 1998.
English Language Abstract of German 2 103 132.
English Language Abstract of French 1,388,807.
Doppelbauer Thomas
Kaibach Werner
Raber Stefan
Schad Hanspeter
Hilti Aktiengesellschaft
Saether Flemming
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