Patent ID: 7387319

Claim:
A coupling of drill anchors, comprising: a sleeve ( 1 ) with an inside thread ( 5 ) and with two anchor pipes ( 2 ) which bear an outside thread ( 3 ) and which are screwed into the sleeve ( 1 ) from opposing sides; an annular rib ( 4 ) essentially in the lengthwise middle of the sleeve ( 1 ) and which projects to an inside; front surfaces ( 6 ) of ends ( 8 ) of the anchor pipes ( 2 ), which ends are held in the sleeve ( 1 ), being located in the area of the annular rib ( 4 ) and directly adjoining one another; and wherein the annular rib ( 4 ) has a cylindrical inner end surface ( 10 ), that the outside surfaces ( 12 ) of the cylindrically shaped, thread-free ends ( 8 ) of the anchor pipes ( 2 ) adjoin the inner end surface ( 10 ) of the annular rib ( 4 ), forming a seal, that the front surfaces ( 6 ) of the anchor pipes ( 2 ) each have a chamfer ( 22 ) inside and/or ( 20 ) outside, that there is at least one annular seal ( 21 ) on the annular rib ( 4 ), and that the anchor pipes ( 2 ) with the chamfers ( 20 ) on the outside edge of their front surfaces ( 6 ) adjoin the annular seal ( 21 ) which is disposed in the space bounded by said chamfers ( 20 ) and said rib ( 4 ), and side surfaces ( 16 ) of the annular rib ( 4 ) are aligned normally to an axis ( 7 ) of the sleeve ( 1 ), the front surfaces ( 6 ) of the anchor pipes ( 2 ) adjoining one another to form a seal.