Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Reexamination Certificate
1999-03-16
2001-08-07
Saether, Flemming (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
C411S060300, C411S061000
Reexamination Certificate
active
06270303
ABSTRACT:
TECHNICAL FIELD
The invention relates to an anchor bolt with an expansion core intended to be introduced and anchored into a material, e.g. a wall, in order to fix an article thereto.
BACKGROUND ART
The invention relates more particularly to an anchor bolt of a type comprising a fixing rod, an expandable sleeve and an expansion core integral in translation with the fixing rod, intended to expand the sleeve, the sleeve making at least one slot widening towards a free end of the sleeve, thereby forming at least one expansion tooth cooperating with the core. The expansion tooth is designed to decrease the pressures being exerted on the sleeve during expansion, thus making expansion easier.
With bolts of this type, there is a risk that the inner edge of the tooth or teeth of the expandable sleeve will be anchored in the expansion core, thereby damaging it and impeding the translation thereof toward the exterior of a locating hole for the bolt. The operator then has to use great force in order to free the expansion core and anchor the bolt.
SUMMARY OF THE INVENTION
The invention aims to obviate this disadvantage.
To this end, the invention relates to a bolt of the type defined hereinabove, characterised in that the inner wall of the edge of the expansion tooth is blunt.
The thickness of the tooth advantageously decreases towards the free end of the sleeve.
The expansion of the sleeve is consequently made easier.
The sleeve advantageously comprises one anti-rotation stamped boss.
Thus, the contact surface between the sleeve and the expansion core is less. important. Consequently, the friction between the sleeve and the expansion core is decreased, which makes easier the relative movement of the core and the sleeve.
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patent: 4904135 (1990-02-01), Barthomeuf
patent: 4968200 (1990-11-01), Mark
patent: 5176481 (1993-01-01), Schiefer
patent: 5314278 (1994-05-01), Weber
patent: 5419664 (1995-05-01), Hengesbach
patent: 5458448 (1995-10-01), Cheng
patent: 42 20 300 (1993-12-01), None
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patent: 0 524 137 (1993-01-01), None
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Barthomeuf Jean-Paul
Gauthier Alain
Lowe Hauptman & Gilman & Berner LLP
Saether Flemming
Societe de Prospection et d'Inventions Techniques Spit
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