F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/24
F16B 35/00 (2006.01) F16B 13/00 (2006.01) F16B 13/12 (2006.01)
Patent
CA 1129690
ABSTRACT OF THE DISCLOSURE . A self-drilling dowel assembly is made up of an expansion sleeve with an annular drill bit formed on one end of 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.
321120
Hilti - Aktiengesellschaft
Rolston George A.
LandOfFree
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