E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
E02D 5/74 (2006.01)
Patent
CA 2060613
CONICAL SEISMIC ANCHOR AND DRILL BIT FOR USE WITH UNREINFORCED MASONRY STRUCTURES ABSTRACT OF THE DISCLOSURE A process for attaching a seismic anchor to a wall of an unreinforced masonry structure includes the steps of drilling a generally frusto-conical cavity into the wall, and securing a seismic anchor into the cavity having a frusto-conical plug whose dimensions match at least a portion of the wall cavity. A drill bit utilized to form the wall cavity is adapted to be rotatably driven by a drill motor and includes a generally frusto-conical cutting blade support, a shank extending rearwardly from the blade support to be clamped within the chuck of the drill motor, and a drill stop positioned over the shank and secured to the rear end of the blade support. The blade support includes a plurality of radially extending planar exterior surfaces which span the length of the blade support and provide support surfaces for a plurality of cutting blade inserts. A removable pilot drill bit is fixed to a front end of the blade support for cutting a pilot hole into which the blade support is worked. The seismic anchor includes an attachment support rod having a first end and an adjacent portion thereof threaded for receiving a nut. The plug is preferably formed of a concrete material cast in place over the support rod, having sufficient strength that shear and tension forces applied the support rod will cause a failure of the wall relative to the anchor before any failure of the plug relative to the support rod.
Mcgill Scott A.
Mcgill Sterling A.
Gowling Lafleur Henderson Llp
Mcgill Scott A.
Mcgill Sterling A.
LandOfFree
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