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Drill guide for cutting openings in stone countertops

[Category : - Tools]
[Viewed 1262 times]

A guide assembly for use with a rotating bit when forming an opening in a stone countertop. The assembly includes a base unit having an annular, resiliently flexible body with a ring-shaped suction cup at its lower end. The suction cup forms a seal about the bottom of the base unit that forms a reservoir for holding water during the cutting operation. A rigid ring-shaped insert is mounted in the resilient body and includes a plurality of upwardly projecting mounting pegs. Flat, disk-shaped guide bushings are interchangeably mountable to the pegs atop the base unit, and have central guide openings of different sizes for different sizes of bits. The guide bushings are formed of a rigid, low-friction material, such as a low-friction polymeric material.


Stone countertops are an increasingly popular feature of both residential and commercial construction, valued for both their durability and beauty.

As used in this description and the appended claims, the term “stone” includes natural
stone (e.g., granite, marble, and so on) and artificial stone materials. The term “countertop”, in turn, includes not only kitchen and bathroom counters, but also Worktops, tub surrounds and similar installations.
A major difficulty facing installers is cutting/boring holes to accommodate various items that must pass through the countertop, such as faucets and other plumbing fixtures,
Wiring, and so on. This must be done after the countertop itself has been placed into position and installed. As a result, the holes must frequently be formed in corners, along edges, and in other areas where access is limited or difficult. The operation is further complicated by the fact that the surface must be kept flooded with Water or other lubricant for the bit during the cutting operation. However, even a minor error in
the location or angle of the hole can ruin the countertop so that it must be removed and replaced, at great expense to the installer; such errors are far from infrequent, and cost even experienced installers many thousands of dollars every year.

Prior devices have been proposed to provide guidance for a bit or other cutting tool when forming holes in stone or similar materials. The great majority of these devices are simply too large and cumbersome for use in countertop installation work, especially where the holes need to be formed in tight areas or close to an obstacle; many have been designed as shop tools that would be wholly unsuitable to
the needs of a craftsman drilling a hole at the point of installation.

In other instances, the devices, although smaller, have been insufficiently secure to avoid slippage and error.

Most prior devices have also been complicated and expensive, and moreover have been difficult and inconvenient to use. Also, many of the prior devices employ or require the use of obsolete forms of drill motors that are no longer used in the industry; for example, pistol-grip drills are no longer used for coring bits, which now utilize industry standardized acme threads.

As yet another drawback the prior devices have generally been constructed with metal bodies or housings, thus making it virtually inevitable that the countertop or adjoining surfaces will be scratched or otherwise marred during use of the tool.

Accordingly, there exists a need for an apparatus for guiding a rotating bit while forming a hole in a stone
countertop, that securely attaches to the countertop so as to obviate any potential for slippage and error. Furthermore, there exists a need for such an apparatus that can be conveniently used in areas where access or space is limited. Still further, there exists a need for such an apparatus that provides a reservoir in order to keep the material and bit flooded with fluid during the cutting operation.

Still further, there exists a need for such an apparatus that can be used with conventional hole-cutting bits and tools that does not require the installer to purchase special drill motors/equipment.

Still further, there exists a need for such an apparatus that is simple and convenient for the operator to use.

Still further, there exists a need for such an apparatus that can readily accommodate the different sizes of bits that are used in forming holes in countertops.

Still further, there exists a need for such an apparatus that obviates the possibility of
scratching, marring or otherwise damaging the countertop and adjoining surfaces.

Still further, there exists a need for such an apparatus that can be manufactured on an economical basis.

For additional information see

Patent N0.: US 7,290,963 B2

Date of Patent: Nov. 6, 2007


Financial information

Primarily I am looking to sell this patent, or as an alternative to license this patent. The invention was previously marketed, prior to the primary inventor becoming ill will cancer.

The Product/ Invention has the following costs and margins

The Sure-Guide Kit if we bought 5000 for the Complete Set and Cases would be...

$ 2.45 Kit
+ $ 2.45 Case
$ 4.90 Completed Sure-Guide Kit

Our Sale Price to our distributors was $17.99 each
Our Cost of the Sure Guide Kit was $ 4.90 each
Profit on the Sale was 72% on standard orders of 100-200 units
Our Customers were setting their own pricing in wholesale markets.
Large volume orders were sold at $12.99 each, which was a 63% margin

The market potential is huge. Again stone and engineered solid surfaces are extremely popular in both residential and commercial construction.

The cost of replacing diamond tipped hole saw bits is significant , with bits ranging from as low as $20-25 each up to $55-70 each ( price relative to size)

With this device, the diamond hole saw bits can be preserved longer so the cost of replacement of these hole saw bits can for gone for longer periods of time.

Additionally, the application of the device, makes drilling significantly easier and reduces the chances of damage and or loss when drilling into natural stone , ceramic and porcelain tiles and engineered solid surfaces.

Terms and Conditions to be disclosed.








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