Self-drilling, self-anchoring fastener for concrete
AssigneeSimpson Strong-Tie Company, Inc.
InventorAlex S. Toback
Life of this patent
Estimating the term…
Abstract
A fastener adapted for anchoring into a masonry structure, such as a concrete block, employs an epoxy resin system so that the fastener is both mechanically engaged and bonded to the structure. In one preferred configuration, the bead is composed of a hardener, a resin and a nylon powder and has a cardioid-shaped configuration which subtends substantially 360° around the shank at an intermediate position of a threaded portion of the fastener. Various configurations are disclosed, including a fastener wherein adhesive in microencapsulated form is also applied to a lower intermediate portion. In addition, wings may extend from the shank.
Claims20
A connection comprising:
- a masonry support structure and a fastener received in said masonry support structure, said fastener comprising;
- head means comprising a engagement surface and drive means for receiving an applied torque;
- a shank axially extending from said head means at a proximal end to a distal end terminating at a tip, said shank comprising a proximal portion defining a first diameter adjacent said shank proximal end and a distal portion having a second diameter less than said first diameter adjacent said shank distal end, a first thread extending helically along a portion of said proximal portion and a second thread extending helically along a portion of said distal portion, said second thread not extending to said distal end, said shank distal end defining material transfer means within said second diameter extending from a location adjacent said tip to a location adjacent said second thread such that said material transfer means spans the axial distance between said tip and said second thread;
- a coating comprising a resin or an adhesive in a micro-encapsulated form disposed over at least one of the group consisting of said shank distal portion, said shank proximal portion, said first thread and said second thread;
- and
- self-drilling means adjacent said shank tip for drilling into said support structure, said self drilling means creating masonry dust from said masonry support structure, some of said masonry dust being mixed with said coating.
A connection comprising:
- a masonry support structure and a fastener received in said masonry support structure, said fastener comprising;
- head means comprising a engagement surface and drive means for receiving an applied torque;
- a shank axially extending from said head means at a proximal end to a distal end terminating at a tip comprising self-drilling means for drilling into said support structure, said shank comprising a proximal portion adjacent said shank proximal end, a first intermediate portion adjacent said proximal portion, a second intermediate portion between said first intermediate portion and said tip and a thread extending helically along said intermediate portions;
- and
- a resin bead applied only to said first intermediate portion.
A connection comprising:
- a masonry support structure and a fastener received in said masonry support structure, said fastener comprising;
- a head comprising an engagement surface and drive means for receiving an applied torque;
- a shank axially extending from said head at a proximal end to a distal end terminating at a tip, said shank comprising a proximal portion adjacent said shank proximal end, an intermediate portion between said proximal portion and said tip and a thread extending helically along said intermediate portion, said shank tip comprising self-drilling means for drilling into the support structure;
- and
- a bead comprising an epoxy resin applied only to said first intermediate portion,
- so that upon driving said fastener into said structure said thread mechanically engages said structure and said shank bonds with said structure.
Dependencies are inferred from the claim text.