Anchoring drill bit, system and method of anchoring

Abstract

A system, apparatuses and methods for anchoring are provided. The system includes two-stage drill bit and a method of anchoring into a two-stage hole drilled by the drill bit. The apparatus of the instant invention includes a two-stage drill bit for drilling a pilot hole for a common nail into a material such as concrete, stone, masonry or cementuous or other materials. The method of the instant invention includes the steps of drilling a first hole within a material to which an object is to be anchored, drilling a second hole concentric with the first hole, and placing an anchor within the holes.

Description

[0001] This application is a divisional of U.S. application Ser. No. 10 / 988,998 filed Nov. 12, 2004, which claims priority pursuant to 35 U.S.C. 119(e) to co-pending U.S. Provisional Patent Application Ser. No. 60 / 519,223, filed Nov. 12, 2003, the entire disclosures of which are incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates generally to systems, apparatuses and methods for anchoring. More particularly, the present invention is concerned with a two-stage drill bit and a method for anchoring into brittle materials such as concrete, stone, masonry and cementuous materials using a common nail. BACKGROUND OF THE INVENTION [0003] In construction applications it is often necessary or desirable to anchor into an existing concrete structure. In many construction applications the anchor is intended to be permanent to tie in a newer structure with an existing concrete structure. In such permanent anchoring applications, removal of the anchors is g...

AI Technical Summary

Benefits of technology

The invention is a system, apparatuses, and methods for anchoring into materials such as concrete, stone, masonry, and cement. The system includes a two-stage masonry drill bit with two cutting surfaces of different diameters. The first cutting surface is located at the outer end of the drill bit and has a smaller diameter than the second cutting surface. The second cutting surface is located along the shank of the drill bit and has a larger diameter than the first cutting surface. The system is designed to provide a secure and cost-effective way to anchor into materials, with minimal damage to the surface and no spawling. The system can be easily installed and removed using standard nails and common tools.

Problems solved by technology

Thus, the removal of such permanent anchors from the concrete will undoubtedly result in damage to the surface of the concrete.

A common problem with such applications is that the surface of the concrete is usually damaged as the nail is removed from the concrete.

The most common type of damage to the surface of the concrete is known as spawling, which is caused when the surface of the concrete surrounding the pilot hole is pulled upward by friction with the nail as the nail is pulled upward and breaks away leaving an indentation or pit in the surface of the concrete.

Spawling in a concrete surface is undesirable as it creates an unattractive surface and patching a spawled surface is difficult as the patch will usually flake off.

Insertion of the softer material is extremely time consuming and requires that the contractor have an ample supply of the material on hand.

Furthermore, spawling often still occurs when the nail is removed, as the softer material is usually located on one side of the nail and the opposite side is pressed up against the concrete.

When the nail is removed, spawling occurs on the side of the concrete which the nail is pressed against.

Such specially designed nails are extremely expensive when compared to standard nails, and also result in the same one-sided spawling discussed above.

While this system does reduce spawling to the concrete surface when the screw can be reversed out of the pilot hole, some spawling often does still occur when the screw is reversed, and a number of other disadvantages exist.

Screws are relatively expensive (approx.

The wear on the contractor's drill is significant as it is used not only to drill the pilot hole, which necessitates very little torque, but also to drive and reverse the screw, which necessitates considerable torque.

The time requirement of driving and reversing the screws is significant.

In addition, the heads of the screws often strip out, making reversal of the screws impossible and resulting in substantial spawling to the concrete surface when the screw must be forcefully extracted from the concrete.

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