Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent
1979-02-14
1980-09-23
Britts, Ramon S.
Boring or penetrating the earth
Below-ground impact members
With releasable means to detachably retain telescoping...
175415, E04B 149, F16B 1306
Patent
active
042235871
ABSTRACT:
A self-drilling dowel assembly is made up of an expansion sleeve with an annular drill bit formed on one end and a spreader axially displaceable through the sleeve after it has formed a borehole for expanding and anchoring the sleeve in the borehole. The bore through the sleeve is divided by a transverse partition wall into two axially extending blind bores each extending inwardly from an opposite end of the sleeve. The blind bore extending from the drill bit end of the sleeve has a diameter which is 0.5 to 0.9 times the exterior diameter of the sleeve and the axial length of this blind bore is also about 0.5 to 0.9 times the exterior diameter of the sleeve. Axially extending grooves are formed in the exterior surface of the sleeve and recesses extend inwardly from the base of the grooves for facilitating the expansion of the sleeve.
REFERENCES:
patent: 175672 (1876-04-01), Crump
patent: 2318326 (1943-05-01), Padley et al.
patent: 2545195 (1951-03-01), Crake
patent: 2707897 (1955-05-01), Beeson
patent: 3213951 (1965-10-01), Eeles
patent: 3467209 (1969-09-01), Chromy
patent: 4157677 (1979-06-01), Deutschenbaur et al.
Britts Ramon S.
Hilti Aktiengesellschaft
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