GB2594342A

GB2594342A - Tool

Info

Publication number: GB2594342A
Application number: GB2016627.8A
Authority: GB
Inventors: Harnett Tyrone
Original assignee: Plumbingenuity Ltd
Current assignee: Plumbingenuity Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2021-10-27
Also published as: GB202016627D0

Abstract

A tool 14 can be received by part of a power drill, in use, and cooperates with a core drill bit (12, figure 2), also called a hole saw. The tool has an axial passage 22 extending over its entire length. There may also be a core material removal tool 36 which can be introduced through the passage 22 to dislodge a core located within the core drill bit fitted to the tool. The core material removal tool 36 may be a rigid rod of a diameter slightly smaller than the minimum diameter of the through passage 22.

Description

1 TOOL This invention relates to a tool, and in particular to an adapter whereby a core drill bit or diamond core hole cutting bit can be fitted to, for example, a power tool in the form of a power drill or the like.

Core drill bits and the like are in widespread use, being used in the drilling or formation of relatively large diameter holes or openings, for example of diameter in the range 38mm to 127mm, in walls or the like, for example in the installation of pipes, flues or vent ducts or the like. A typical core drill bit includes, at one end thereof, a threaded opening that, in use, is threadedly mounted upon an adapter which, in turn, is fitted to the chuck or the like of the power tool. After use, the core drill bit has to be unscrewed from the adapter, to allow the use of the adapter with a drill bit of a different size. The loadings and environment experienced, during use of the core drill bit in drilling a hole or opening, are such that it is fairly common for the drill bit to bind or become jammed upon the adapter, requiring the use of tools to apply sufficiently large loads to allow the drill bit to be unscrewed from the adapter. On occasion, in order to release the drill bit from the adapter, the user may hit the drill bit, for example with a hammer, which carries the risk of damage to the drill bit.

One further problem associated with the use of core drill bits is that, in use, the core of waste material formed using the drill bit is located within the central void of the drill bit and can become jammed within the void. Removal of the core from the void to allow subsequent use of the drill bit in the formation of another hole or opening can be problematic. Again, the user may hit the drill bit, for example using a hammer, in an attempt to dislodge the core, and this carries the risk of damaging the drill bit as mentioned hereinbefore.

It is an object of the invention to provide a tool in which at least some of the disadvantages associated with known arrangements are overcome or are of reduced effect.

According to the present invention there is provided a tool adapted to be received by a part of a power drill, in use, and to cooperate, in use, with a core drill bit, the tool containing an axial though passage extending over the complete length thereof In use, a suitable core removal tool may be introduced into the through passage and used to dislodge a core located within the core drill bit fitted to the tool. The core removal tool conveniently comprises a rigid rod of a diameter slightly smaller than the minimum diameter of the through passage.

Also described is a tool comprising a first part adapted to be received by a part of a power tool, in use, and a second part adapted to cooperate, in use, with a core drill bit, the first and second parts being releasably couplable to one another by a releasable coupling including a coupling pin that, in use, extends within aligned passages formed in the first and second parts, the coupling pin including a resilient retainer clip section that resiliently extends around at least part of, and engages, the first or second part to retain the coupling pin in position.

Such an arrangement is advantageous in that by release of the coupling, involving removal of the coupling pin, the first and second parts may be separated from one another. If the user possesses a set of second parts, these may be left secured to respective ones of his core drill bits. Accordingly, through the use of the invention, the need to use tools to apply loadings to release the core drill bit from the adapter is avoided, or required only when the core drill bits have become worn and require replacement.

Preferably, the first part includes an axial projection, received within an axial recess or passage formed in the second part. The projection and recess may both be of circular cross-sectional shape. However, this need not always be the case, and they may be of matching or complementary non-circular cross-sectional shapes with the result that the first and second parts may only be assembled to one another in a single relative orientation or in selected relative orientations. Furthermore, such an arrangement may assist in transmitting drive between the first and second parts.

The second part preferably contains an axial though passage extending over the complete length thereof. In use, a suitable core material removal tool may be introduced into the through passage and used to dislodge a core located within the core drill bit fitted to the second part. The core material removal tool conveniently comprises a rigid rod of a diameter slightly smaller than the minimum diameter of the through passage.

An end part of the through passage may be shaped to permit a tapered guide or centre pin to be fitted thereto. The second part may include a radial or diametrically extending passage adapted to allow a tapered drift key to be used in releasing or removing such a tapered guide or centre pin from the passage.

The design of the releasable coupling is advantageous in that it does not extend significantly beyond the outer diameter of the second part, and so does not significantly increase the overall diameter of the tool. Accordingly, it is suitable for use even where the core drill bit is of relatively small diameter. Furthermore, it does not result in the application of significant out of balance loads, and so does not place undue strain upon the power drill with which the invention is used or result in use of the power drill being impaired or impeded.

The invention will further be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is an exploded view of the tool of an embodiment of the invention; Figure 2 is an assembled view of the tool of Figure 1; Figure 3 is a view illustrating the tool of Figure 1, in use; and Figure 4 is a further view illustrating the tool of Figure 1.

Referring to the accompanying drawings, a tool 10 is illustrated, for use in the attachment of a core drill bit 12 to a power tool or the like (not shown). The tool 10 thus takes the form of a core bit adapter. The tool 10 comprises a first part 14 adapted to be secured to the chuck or the like of the power tool, the first part 14 being of stepped cylindrical form including a projection 16 of a reduced diameter, projecting or extending from a main section 18 adapted to be secured to the power tool. The precise form of the main section 18 will depend upon the nature of the power tool with which the tool 10 is to be fitted, and the invention is not restricted to any particular shape of the main section 18, but rather covers any shape of main section 18 suitable for use in attachment of the first part 14 to a power tool in such a manner as to permit the first part 14 to be rotated at high speed about its axis.

The tool 10 further comprises a second part 20 adapted to be releasable coupled to the first part 14. The second part 20 is of generally cylindrical shape and includes an axial through passage 22 of stepped diameter extending completely through the second part 20. At one end, the second part 20 includes a reduced diameter, externally threaded section 24 for threaded coupling to the core drill bit 12.

The end of the passage 22 remote from the threaded section 24 is of a relatively large diameter, substantially matching the dimeter of the projection 16, thereby allowing the second part 20 to be fitted onto the projection 16 and so allowing the first and second parts 14, 20 to be assembled to one another. The second part 20 is formed with a diametrically extending passage 26, and a corresponding diametrically extending passage 28 is formed in the projection 16, the passages 26, 28 being positioned such that upon assembly of the first and second parts 14, 20, the passages 26, 28 can be aligned with one another. A coupling pin 30 can then be introduced into the aligned passages 26, 28 to securely couple the first and second parts 14, 20 to one another.

The coupling pin 30 is preferably of a diameter substantially matching the diameters of the passages 26, 28 so that there is little play between the coupling pin 30 and the first and second parts 14, 20, when assembled. As illustrated, the coupling pin 30 includes a resilient C-shaped spring clip 32 that, when the first and second parts 14, 20 are assembled to one another and the coupling pin 30 is fitted thereto, extends around part of the second part 20 to retain the coupling pin 30 in position. In the arrangement shown, the coupling pin 30 extends from a central part of the spring clip 32, but it will be appreciated that this need not always be the case and that the pin 30 could be otherwise located, for example attached to an end part of the spring clip. The nature of the releasable coupling so formed is advantageous in that the coupling pin 30, when fitted, does not extend significantly beyond the outer diameter of the second part 20, and so does not significantly impact upon the range of sizes of core drill bits with which the invention may be used. Furthermore, it does not result in significant out of balance loads being experienced by the power tool, in use, which could negatively impact upon the operation thereof or may the task of drilling more difficult for the user.

The part of the passage 22 closest to the threaded section 24 may be of a cross-sectional shape adapted to allow the passage 22 to be used to receive a tapered guide rod or centre pin, in substantially a conventional manner, and a diametrically extending passage 34 may be provided in the second part 20 to allow the use of a convention tapered drift key or the like in the removal of such a tapered guide rod or centre pin.

In use, as shown in Figure 3, a core bit 12 is threadedly mounted upon the threaded section 24 of the second part 20. When it is desired to use the core bit 12 in the formation or drilling of a hole or opening, the second part 20 is assembled to the first part 14 by introducing the projection 16 of the first part 14 into the large diameter end of the passage 22 of the second part 20 and, once the passages 26, 28 are aligned with one another, fully introducing the coupling pin 30 into the aligned passages 26, 28 so that the clip 32 extends around a majority of the second part 20 and serves to retain the coupling pin 30 in position. With the first part secured to the power tool, it will be appreciated that the tool 10 and core drill bit 12 mounted thereto may be driven for rotation A tapered guide rod or centre pin may be introduced into the end part of the passage 22 closest to the threaded section 24.

By introducing the guide rod or centre pin into a pilot hole drilled into the wall in the location at which the hole or opening is to be formed, the power tool and core drill bit may be used in substantially the usual manner to form the opening or hole, the guide rod or centre pin typically being removed from the passage 22 using a tapered drift key after drilling or an initial part of the hole or opening.

Upon completion of drilling, the tool 10 and core drill bit 12 may be removed from the power tool, and a core removal tool 36 in the form of a stiff rod, for example of a suitable metallic material, introduced into the passage 22. It will be appreciated that by applying a suitable load to the tool 36, the core or wall material that may still be located within the core drill bit 12 may be dislodged. If required, hammering or knocking of the core removal tool 36 may be undertaken to dislodge the core, without risk of damaging or denting the core drill bit 12.

Separation of the first and second parts 14, 20, to detach the core drill bit 12 from the first part 14, simply requires release and removal of the coupling pin 30 from the second part 20, after which the second part 20 can be slid off of the projection 16.

It is envisaged that the user will have a set of second parts 20, each left attached to respective ones of his core drill bits 12, may so the need to unscrew core drill bits 12 on a regular basis, with the attendant need to use tools and risk of causing damage to the core drill bits 12, is avoided.

If desired, an extender may be attached in substantially the same manner as set out hereinbefore, between the first and second parts 14, 20, where holes or openings of great depth are to be drilled.

Whilst in the arrangement described hereinbefore, and as illustrated in the accompanying drawings, uses a projection 16 and passage 22 of circular cross sectional shape, it will be appreciated that this need not always be the case and that these parts may be of complementary non-circular shapes, if desired. This may have the benefit of assisting in the transmission of torque loadings between the first and second parts 14, 20, and assisting is assembly of the tool 10. However, it may result in parts of the tool 10 being of reduced wall thickness, potentially reducing the load transmitting capacity thereof, and so may be undesirable in some circumstances.

The nature of the coupling between the first and second parts 14, 20 may be reversed, if desired, with the projection provided on the second part.

Whilst a specific embodiment of the invention is described hereinbefore, it will be appreciated that a number of modifications and alterations may the tool as hereinbefore described without departing from the scope of the invention as defined by the appended claims.

Claims

CLAIMS: 1. A tool adapted to be received by a part of a power drill, in use, and to cooperate, in use, with a core drill bit, the tool containing an axial though passage extending over the complete S length thereof.
2. A tool according to Claim 1, and further comprising a core material removal tool introducible, in use, into the through passage to dislodge a core located within the core drill bit fitted to the tool, in use.
3. A tool according to Claim 2, wherein the core material removal tool comprises a rigid rod of a diameter slightly smaller than the minimum diameter of the through passage.