BACKGROUND OF THE INVENTION Various materials are used to construct furniture of the type mentioned above. One such material is Corian TM which can be glued together to flat even surfaces such that no glue line is evident. This feature allows the product to be repaired at relatively low cost.

Coran ils resistant to many chemicals and household fluids. The surface finish is similar to marble and is made in many decorative colours of one or a mixed colour type.

Most damage to surfaces of this type occurs through extreme heat. Cigarette burns are an example of this, or physical gouging with a sharp object.

A method for the repair of CorianT" and other similar materials is presently in use, and devised by the present inventors, which employs an extremely accurate cutter system of a two-part construction for use mainly with a router machine or motorised drill type machine.

In this method of repair a tapered hole is drilled into the surface at the point of damage thereto into which is fitted a tapered plug produced using a second matching tool.

The repair plug is cut from a small section of the material of the primary surface such as Codas

The tapered plug is made to match the tapered hole in the primary surface. The outside diameter and angles of the plug produced are relatively unimportant provided that the repair plug used fits into the hole correctly, although it is preferable to have a minimal gap at the small end of the tapered hole to ensure a strong overall joint.

Normally the tapered hole dimensions are controlled by using a depth stop on the powered router machine so that the plug fits slightly over-flush or if in a blind hole the required dimensions are made over-flush to avoid bottoming in the hole, but in both cases to ensure contact on the visible face.

The protruding amount of the plug is then trimmed off and merged into the primary surface such that no glue line can be seen by the naked eye and the mend is invisible.

The same system may be used to give a decorative effect with circular plugs of differing size colour or pattern to the customer's choice. Different sized circular plugs are easily produced.

SUMMARY OF THE INVENTION The above described prior art system produces decorative effects and/or repairs using a single plug, the plug being the same colour as the surface to be repaired or of a different colour for decorative effect as desired.

The system however has distinct limitations since it does not provide the facility for producing a wide variety of decorative surfaces either as a result of the need to repair a primary surface or build up a primary surface from scratch with customised decoration upon it.

According to one aspect of the invention there is provided a method of treating a work surface such as a kitchen worktop to repair and/or decorate the same, comprising boring a hole in the work surface at the place to be treated, forming a first plug from the same or

other material as the worktop substantially to the size and dimensions of the hole in the work surface, fitting the first plug in the hole in the workpiece to effect a matching fit, boring a hole in the first plug smaller than the hole in the work surface, forming a second plug from the same or other material as the worktop substantially to the size and dimensions of the hole in the first plug, fitting the second plug in the hole in the first plug and repeating the last step in relation to a third and succeeding plugs until a last plug is formed necessary to complete the filling of the first formed hole in the work surface with a multiplicity of plugs divided by land surface areas thereby to complete the repair and/or form the decorative effect desired.

Preferably centrally formed guide bores are provided in the plugs during formation thereof for use when boring the holes in the plugs to receive smaller plugs therein.

Advantageously the first, second and succeeding holes and plug fillers are tapered with circular cross-sections so as to produce a series of concentric circles on the work surface.

To produce an added decorative effect the plugs may be of differing colours and/or patterns.

According to another aspect of the invention there is provided apparatus for treating a work surface such as a kitchen worktop to repair and/or decorate the same comprising a plurality of first and second matching cutter sets respectively adapted to bore successfully smaller holes and matching plugs therefor in a workpiece thereby to plug a hole in the worktop formed by the first cutter member of the larger of the cutter sets until the repair and/or decorative effective is complete.

Preferably the second cutter member in each cutter set is provided with a drill for forming guide bores in the matching plugs formed thereby, the first cutter member in each cutter set

having guide pins for engaging the guide bores in the matching plugs to bore holes therein for filling with successively smaller matching plugs formed by the second cutter members.

Other features and advantages will become apparent from the following description of the preferred embodiment of the invention taken with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: Fig 1 is a side view of several sets of cutting tools for boring holes in a worktop surface and plugs to fill the holes in accordance with the invention, and Fig 2 is one example of a decorative effect that may be produced using the cutter sets of Fig 1.

PREFERRED EMBODIMENTS OF THE INVENTION There is shown in Fig 1 several sets of cutting tools 1,2,3 for producing treating a worktop surface in accordance with the present invention, either to repair the surface and/or provide a decorative effect thereon.

Each cutter set 1,2,3 comprises first and second boring cutter parts 4,5 which may be operated by a router machine, hand or automatically operated, which is not shown in the drawings.

The boring cutter parts 4 are capable of boring tapered holes in the worktop surface to be treated and the boring cutter parts 5 matching plugs of the same or similar material as that of the worktop surface, for those tapered holes.

The boring cutter parts 4 and 5 in each set are designed respectively to produce holes and plugs of progressively smaller dimensions.

The boring cutter part 5 of each of the cutter sets 1,2,3 is provided with an axially positioned drill 6, removable or fixed, so that axial holes are formed in the plugs formed by the boring cutter parts 5 during a cutting sequence.

The boring cutter part 4 of each cutter set 1,2,3 is provided with a removable or fixed guide pin 7 along its central axis for engaging the axial holes in the plugs for the purpose as will be described below.

The cutter sets 1,2,3 as described are capable for example of producing a decorative effect in a worktop surface such as a kitchen or bedroom worktop, as illustrated in Fig 2 as follows.

A tapered hole is first bored in a worktop surface to be repaired and/or decorated using the largest boring cutter part 4 of the sets 1,2,3 which in the illustration shown is the cutter set 1.

A plug (not shown) with a centrally aligned borehole is then produced from a workpiece of the same or similar material as the worktop, using the boring cutter part 5 with its drill 6 of the cutter set 1. The thus formed plug is then fitted into the hole produced by the first cutter part 4 of the cutter set 1.

The cutter part 4 of the cutter set 2 shown in Fig 1 capable of boring a tapered hole smaller than the cutter part 4 of the cutter set 1 is then used to bore a tapered hole in the in situ plug formed by the cutter part 5 of the first cutter set 1. This is achieved by first engaging the guide pin 7 of the cutter part 4 of the cutter set 2 in the guide hole formed in the in situ plug. The second matching plug thus formed, again with a central guide hole, is then fixed in the tapered hole formed by the cutter part 4 of the cutter set 2.

This sequence of events is repeated until a final plug 4F of a desired size and which has no guide hole, is to be inserted to complete the repair and/or decorative effect which, in the case of the example described above, will be a series of concentric circles as shown in Fig 2 separated by lands 8 which may of different colours if different coloured workpieces from which the plugs are formed are used.