Anchoring bolt
AssigneeUpat GmbH & Co.
InventorsAlbert Frichmann, Danilo Sternisa, Kurt Mermi, Herbert Kistner
Life of this patent
Estimating the term…
Abstract
In order to produce conical undercutting of the bore when the anchoring bolt is driven into a previously bored hole with a percussion drill, the insertion end of the bolt has a slot into which the thin end of a wedge is inserted. Hard metal pegs set in radial bores near the insertion end of the bolt at diametrically opposite places on the periphery of the bolt protrude slightly and, as the bolt is driven into place, the wedge spreads its insertion end and causes the hard metal pegs to undercut the walls of the bore more and more as the bolt is set in place. A conical undercutting of the bar thus results.
Claims16
Anchoring bolt having a smooth shaft portion (3) interposed between and integral with a connection portion (2) and an insertion portion (4) for insertion, by drilling, into a cylindrical bore (21) and for conically undercutting the walls of said bore after insertion, said insertion portion extending to an end of the bolt and having, in accordance with the invention:
- at least two diametrically opposite inserts (30) set in radially running bores (13,32) of said insertion portion of said bolt near said end of said bolt and of said insertion portion, said inserts protruding beyond the periphery of said insertion portion of said bolt;
- a diametrical slot (10) extending axially into said insertion portion of said bolt from said end thereof at the end of said bolt, and
- an axially displaceable elongated spreading wedge (13) having a tapered-down end inserted in said slot of said insertion portion of said bolt and having a width that does not exceed the outer diameter of said insertion portion of said bolt.
Dependencies are inferred from the claim text.