Fastener for cementitious materials
First Claim
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1. A fastener for use in a cementitious material, said fastener comprising:
- a shaft comprising a first portion having a first shaft outer surface, a first shaft inner surface and a first shaft outside diameter and a second portion having a second shaft outer surface, a second shaft inner surface and a second shaft outside diameter, said shaft having a longitudinal void therein, a longitudinal axis and two ends;
a shaft thread that is attached to said first shaft outer surface and said second shaft outer surface, said shaft thread having a variable shaft thread outer diameter with a maximum extent;
a tip that is attached to one end of said shaft, said tip having an upper tip outside diameter that is greater than said second shaft outside diameter, said tip comprising tip threads that are self-centering and self-setting, said tip threads comprising a plurality of thread members that are substantially triangular in cross section and that surround a substantially conical space that is in communication with said longitudinal void; and
a head that is attached to the other end of said shaft.
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Abstract
An apparatus and method for fastening cementitious components together or for fastening a cementitious component to a non-cementitious component to form a structure. In a preferred embodiment, the apparatus is a screw having a hollow shaft from which threads protrude and a tip comprising a plurality of drilling teeth or a plurality of thread members that surround said central space, each of said thread members forming a two-dimensional spiral. In use, the invention is operated by screwing it into the cementitious components and then injecting an adhesive into the void created by the screwing step.
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Citations
25 Claims
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1. A fastener for use in a cementitious material, said fastener comprising:
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a shaft comprising a first portion having a first shaft outer surface, a first shaft inner surface and a first shaft outside diameter and a second portion having a second shaft outer surface, a second shaft inner surface and a second shaft outside diameter, said shaft having a longitudinal void therein, a longitudinal axis and two ends; a shaft thread that is attached to said first shaft outer surface and said second shaft outer surface, said shaft thread having a variable shaft thread outer diameter with a maximum extent; a tip that is attached to one end of said shaft, said tip having an upper tip outside diameter that is greater than said second shaft outside diameter, said tip comprising tip threads that are self-centering and self-setting, said tip threads comprising a plurality of thread members that are substantially triangular in cross section and that surround a substantially conical space that is in communication with said longitudinal void; and a head that is attached to the other end of said shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fastener for use in a cementitious material, said fastener comprising:
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a shaft comprising a first portion having a first shaft outer surface and a first shaft inner surface and a second portion having a second shaft outer surface and a second shaft inner surface, said shaft having a longitudinal void therein and two ends; a shaft thread that is attached to said first shaft outer surface and said second shaft outer surface; a tip that is attached to one end of said shaft, said tip comprising tip threads, said tip threads comprising a plurality of thread members that surround a space that is in communication with said longitudinal void; and a head that is attached to the other end of said shaft.
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10. A fastener comprising:
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a shaft having two ends, an outer surface and a longitudinal bore; a screw thread having a base that is attached to said outer surface along a curve traced on said outer surface by its rotation past a point crossing a right section of said shaft at an oblique angle; and a tip that is attached to one end of said shaft, said tip having a central space that is in communication with said longitudinal bore, said tip comprising a plurality of thread members that surround said central space, each of said thread members forming a two-dimensional spiral having a maximum outer diameter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A fastener comprising:
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a shaft having two ends, an outer surface and a longitudinal bore; and wherein said shaft comprises a first portion and a second portion, said first portion being cylindrical in shape and having a cylinder diameter and said second portion having the shape of a truncated cone with a base having a base diameter, and wherein said base diameter is greater than said cylinder diameter and approximately equal to said maximum outer diameter; a screw thread having a base that is attached to said outer surface along a curve traced on said outer surface by its rotation past a point crossing a right section of said shaft at an oblique angle; a tip that is attached to one end of said shaft, said tip having a central space that is in communication with said longitudinal bore, said tip having a plurality of drilling teeth protruding from it that surround said central space, said tip having a maximum outer diameter. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A fastener for joining two separate cementitious items without pre-drilling of a hole into the two separate cementitious items in which to insert the fastener, said fastener comprising:
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a shaft having two ends, an outer surface and a longitudinal bore; a screw thread having a base that is attached to said outer surface along a curve traced on said outer surface by its rotation past a point crossing a right section of said shaft at an oblique angle; and a tip that is attached to one end of said shaft, said tip having a central space that is in communication with said longitudinal bore, said tip comprising a plurality of thread members that surround said central space, each of said thread members forming a two-dimensional spiral having a maximum outer diameter; wherein said tip, said screw thread and said tip constitute a single component and said fastener is operative to join the two separate cementitious items to produce an adhered and reinforced single object.
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Specification