Back to results
US 7,309,199 B2Granted
Sprue dowel
AssigneeHilti Aktiengesellschaft
InventorThomas Ayrle
Life of this patent
Estimating the term…
Abstract
A sprue dowel has a radially projecting embeddable portion (12) and an attachment portion (21) formed as a hollow cylindrical shaft (24) provided with a plurality of spaced from each other, furrowed retaining projections (26, 27) formed on an outer circumference of the shaft and extending parallel to a longitudinal axis (25) of the sprue dowel (11).
Claims14
A sprue dowel, comprising a radially projecting, embeddable portion (12);
- an attachment portion (21) formed as a hollow cylindrical shaft (24) extending from said embeddable portion;
- a plurality of spaced from each other, furrowed retaining projections (26, 27) provided on an outer circumference of the shaft (24) and extending parallel to a longitudinal axis (25) of the sprue dowel (11), and helically extending guide elements (29) provided on the outer surface of the shaft (24);
- and at least one bore (42) formed in said hollow cylindrical shaft (24) in a direction traversing said longitudinal axis (25) and in a region of a free end (22) of the attachment portion (21).
Dependencies are inferred from the claim text.