Damaged bolt and screw removing devices

B - Operations – Transporting – 25 – B

Patent

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B25B 13/50 (2006.01)

Patent

CA 2523268

A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by scraping surfaces formed from two-sided frusto- conically-~shaped regions. The scraping surfaces are bounded on one side by a cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis and where the scraping surfaces comprise a plurality of serrations.

L'invention a trait à un foret destiné à extraire une attache cassée, qui comprend une pointe depuis laquelle s'étendent au moins deux encoches séparées par des surfaces de raclage formées de zones à deux faces possédant la forme d'un tronc de cône. Les surfaces de raclages sont reliées sur un côté par une arête coupante et sur l'autre côté par une arête non coupante, et sont adaptées de manière à percer l'attache lorsque le dispositif tourne dans un sens opposé au sens d'insertion de l'attache. Des modes de réalisation spécifiques comprennent des configurations dans lesquelles les arêtes de coupe s'étendent à des angles différents par rapport à l'axe du dispositif, et dans lesquelles les surfaces de raclage comportent une pluralité de stries.

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