GB2436540A

GB2436540A - Cutting and chamfering device

Info

Publication number: GB2436540A
Application number: GB0606440A
Authority: GB
Inventors: Patrick James Thornton; Paul Richard Auckland
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-31
Filing date: 2006-03-31
Publication date: 2007-10-03
Anticipated expiration: 2026-03-31
Also published as: GB2436540B; GB0606440D0

Abstract

The device 100 includes at least a first 103 and a second 104 cutting edge configured to act upon a first region of an object 301 to be cut. The second cutting edge is disposed a distance 105 away from the first cutting edge. The second cutting edge is configured to cut the first region leaving a chamfer edge. The device may include a saw blade 102 and a handle 101 or may be used in a power tool such as a band saw, mitre saw, hand held electric saw or angle grinder. The second cutting edge may be offset by an angle of 40-50 degrees and have a triangular or semi-circular cross section. An alternative device includes a curved first cutting edge. A further alternative device includes a fixed cutting edge and an affixable edge with the affixable edge perpendicular to an axis through a first region and the fixed edge when the device is in use.

Description

CUTTING AND CHAMPERING DEVICE

Field of the Invention

The present invention relates to a device which allows a user to cut creating s an edge and champer this edge in a single operation

Background to the Invention

On a work site it is often necessary to cut different lengths of material into sizes suitable for a particular application of the object being cut. To perform such io operations saws are used, saws may either be of a hand tool type wherein all the force applied by the saw and particularly the cutting edge of the saw to the object being cut is provided by the user or alternatively saws may be operated via an integral motor for instance an electric or internal combustion driven engine which drives a culling edge against the object so causing the object to be cut.

In addition to cutting the object it is also often necessary to modify a cut edge so as to allow it to join with another object. One example of such a modification is the champering of a cut edge, champering meaning to take the edge from a substantially perpendicular surface to a more off set surface relative to an longitudinal axis of the object being cut.

This type of champering is necessary particulary with respect to pipes wherein the pipe is then inserted into a rubber lined receptor and used for the transmission of fluids and other plumbing operations. At the present time in order to both cut an object down to the required size and champher its edge requires two separate operations. The first of these operations involves culling the object using a hand or power saw. The second operation then involves applying a champher to the edge using most normally a hand abrasive tool such as a file or alternatively using a power tool such as an angle grinder.

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If the object being cut is a piece of pipe, and more particularly if this piece of pipe is being used in new ground works associated with a building project, this operation of cutting the pipe and making the champhered edge is a bottle neck as once the trench has been dug and the layout of the piping has been determined in then incumbent upon the person charged with cutting and champering the edge to do this as quickly as possible. This operation therefore holds up the rest of the works associated with making good the join between the pipe and the other components of the pulling system and the later operations of filling the trench in which the pipe resides and other ground works on or about the site of the pipes placement.

Other disadvantages associated with this prior art process include the necessity for two different tools, a first cutting device and a second filing or grinding device to perform the two step operation on the object being cut.

Another disadvantage known when an object such as a pipe is being cut on a work site is that it is necessary to have a substantially square cut on such a piece of pipe in order to allow it to fit with a plumbing collar or other device into which it will be inserted. So as to form a completed pipeline or other type of utility system. If the end of the object has a non square cut, this can lead to poor fitting into the collar, resulting in leakage or failure of the system. These sorts of collars generally comprising an inner plastic collar configured to form a tight seal with the pipe inserted therein.

The inventors seeing the disadvantages of this two step process have developed a new form of cutting device which performs both operations at the same time.

Summary of the Invention

According to a first aspect there is provided a cutting device which comprises at least a first and a second cutting edge, these first and second cuffing edges are configured to act upon a first region of an object which is to be cut. The first and second cuffing edges are disposed a first distance apart.

Finally the invention is characterised in that the second cutting edge is configured to cut the first region of the object and leaves a champered edge thereon.

This invention therefore addresses the problems associated with prior art devices as the operation of both cutting and champhering a piece of pipe or other object to be cut is performed by a single device in a single operation. This both saves time and cuts down on the number of tools an operator needs to locate before he can perform his task.

Preferably the second cutting edge is off set relative to a perpendicular axis formed relative to the first region of the object which is being cut and this axis also passes through the first cutting edge.

By off setting the second cut and edge relative to this axis which is formed on a perpendicular angle relative to the object which is being cut and which passes through the first cuffing edge, the second cuffing edge therefore forms a tapered cuffing edge which acts against the region being cut of the object and due to its tapered nature causes the region being cut to be champhered.

Most preferably the second cuffing edge is off set by an angle of 400 to 500 relative to the perpendicular axis.

This degree of off set of the second cutting edge relative to the perpendicular axis is considered by the inventors to be most useful as most plumbing joints and other types of joints are configured to operate on champhered edges of between 40 to 50 C relative to a longitudinal surface of the pipe which has been joined.

Preferably the second cutting edge has a substantially triangular cross section. Lf-

Alternatively the second cutting edge may have a substantially semi circular cross section.

Preferably the second culling edge has one of the following surface types: A grinding surface; A filing surface; An abrasive surface.

Preferably the cutting device may comprise a third cutting edge, this third cutting edge is disposed on the opposite side of perpendicular axis formed relative to said first region through said first culling edge.

The provision of a second and third culling edge disposed on either side of the first culling edge allows both sides of the cut made by the first culling edge to be champhered by the cutting device. Therefore if both pieces of material on either side of the cut are to be used in an operation then no further modifications are necessary to either piece which has been cut with a culling device according to the present invention.

Preferably the third culling edge is disposed a first distance from said first cutting edge, this being the same distance at which the second culling edge is disposed from the first culling edge as well.

Alternatively, the third culling edge may be disposed at a second distance from the first culling edge, this being a different distance to that of the second culling edge relative to the first culling edge.

Preferably said third culling edge may be off set relative to the perpendicular axis formed from said first region through said first culling edge.

Most preferably the third cuthng edge may be off set by an angle of between to 50 C relative to this perpendicular axis.

Preferably the third cutting edge has a substantially triangular cross section.

Alternatively the third cutting edge may have a substantially semi circular cross section.

io Preferably the second cutting edge may be adjustable relative to the first cutting edge.

The provision of this adjustment mechanism between the first and second cutting edges allows the same cutting device to be used to cut pipes and other objects of different dimensions. This is important as the distance between the first and second cutting edge or more particularly the optimal distance between the first and second cutting edge will differ depending upon the relative dimensions of the object being cut, generally speaking the larger the dimension of the object being cut, the greater the distance necessary between the first and second cutting edge.

Preferably the third cutting edge is also adjustable relative to the first cutting edge.

The second and third cutting edge may be relatively moveable in relation to the first cutting edge both dependently and independently of the movement of each other. If the second and third cutting edges are dependent upon movement of each other, this will cause the champhered edges created by the second and third edges to be substantially identical. However if the third and second edges are adjustable both relative to the first cutting edge and to each other, this will allow the creation of different champered edges upon either side of the cut created by the first cutting edge.

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in addition to the second and third cuffing edges being adjustable in distance from the first cutting edge, they may also be adjustable in terms of their off set relative to perpendicular axis formed relative to the first region through the first cutting edge. This adjustability both dependently and independently of the third and second cuffing edges relative to each other will again allow either identical champhered edge to be created on either side of the object being cut or alternatively differently champered edges depending upon the relative adjustment of the second and third edges to each other.

Preferably the second cutting edge may be spring loaded relative to the first cutting edge.

By spring loading the second cutting edge relative to the first cutting edge this allows a degree of self adjustment in the second cuffing edge, meaning that if an operator presses down particularly hard with the cutting device upon an object which is being cut the second cutting edge has a degree of movement which lessens the likelihood of damage to the second cutting edge due to excessive force being applied by the operator with the cutting device. The degree of spring loading may be adjusted dependent upon the material being cut and other factors.

Preferably the third cutting edge may also be spring loaded relative to the first cutting edge.

In addition to the second and third cutting edges being spring loaded relative to the first cutting edge along the perpendicular axis formed relative to the first region through the first cutting edge, the second and third cutting edges may also be spring loaded in respect of their degree of off setting relative to this axis, the reasons for this spring loaded are as indicated above to reduce the likelihood of destructive forces being transmitted to the second or third cutting edges by the application of excessive force to the cutting device by an operator.

Preferably the second cutting edge may be pivotally mounted upon the cutting device relative to the first cutting edge.

Preferably the third cutting edge may be pivotally mounted upon the cutting device relative to the first cutting edge.

Preferably a second cutting edge is configured to be demountable from the device.

By allowing the cutting edge to be demountable from the device, this allows a single cutting device to have a number of different functionality's. In many instances it may not be necessary or indeed preferable to have a cutting and chamfering cutting device all in one tool. Therefore by allowing the second cutting edge to be demountable from the cutting device this allows a single tool to both operable as a cuffing and chamfering device and as a more simple cutting device comprising a single cutting edge.

Preferably the third cutting edge may be demountable from the device.

Similarly to above, the ability to demount the third cutting edge from the device allows a user greater flexibility in the use to which their cutting device may be put.

According to a further aspect of the present invention the first cutting edge of the cuffing device may comprise at least one portion thereof which is operable to cut the object in first direction of movement and this first cuffing edge may also comprise at least one further portion not configured to cut the object in this first direction of movement.

By providing the first cutting edge with portions which cut in a first direction and portions which do not cut in this first direction, the overall amount of force necessary to move the cutting device through an object being cut is reduced as the amount of contact between the first cutting edge and the object being cut specifically the first region thereof is reduced and therefore the total amount of mechanical force necessary to operate the device is reduced.

The inventors consider this modification useful as if the cutting device comprises a first, second and third cutting edges all of which are operable to cut in a first direction of movement, this could lead to a device which requires a significant amount of mechanical force to operate effectively, thereby making the io device potentially very tiring to use or alternatively outside of the operating capabilities of significant proportions of the population who do not need a required amount of strength to operate the cutting device. However such considerations are considered less important if the cutting device forms a part of a power tool wherein the power tool can be designed to create a sufficient amount of mechanical force to do the job for which it is designed.

Preferably the second cutting edge may comprise at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in this first direction of movement.

Preferably the third cutting edge may also comprise at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut the object in this first direction of movement.

Preferably the first cutting edge may comprise at least one cutting portion which is operable to cut the object when moved in a direction substantially opposite to the operable direction of at least one cutting portion of the second cutting edge.

By providing portions upon the first and second cutting edges which are operable in substantially opposite directions to each other, the overall amount of mechanical force needed to operate the device is reduced. This reduction comes about as when the cuffing device is being moved in a first direction, the portion upon the first cutting edge is operable and therefore an amount of mechanical force is necessary to operate the device in this first direction, however a portion upon the second cutting device is inoperable in this direction of movement and therefore to significantly reduce the amount of mechanical force is necessary to move the object through this lack of interaction between this portion of the second cuffing edge and the object.

Likewise in the opposite direction of travel the portion of the first cuffing io edge is now inoperable with respect to the object being cut, but the portion of the second cutting edge is now operable with a corresponding reduction in the mechanical force necessary to operate the device due to the counter balanced relationship between these portions of the first and second cuffing edges.

Preferably the first cutting edge may comprise at least one cuffing portion operable to cut the object when moved in a direction substantially opposite to the operable direction of at least one portion of the third cutting edge.

Preferably the second cuffing edge may comprise at least one cuffing portion operable to cut an object when moved in a direction substantially opposite to an operable direction of at least one cutting portion of the third cuffing edge.

Preferably the first cuffing edge may comprise at least two cuffing portions and these two cuffing portions are configured to cut any object in a substantially opposite directions of movement.

A similar mechanical advantage to that indicated above can also be achieved by providing first and second portions upon the first cuffing edge which are operable in substantially opposite directions of movement.

Preferably the second cuffing edge may also comprise at least two cutting portions and these at least two cuffing portions may be configured to cut any object in substantially opposite directions of movement.

Preferably the third cutting edge may also comprise at least two cutting portions and said at least two cutting portions may be configured to cut any object in substantially opposite directions of movement.

Preferably these at least two cutting portions may have different cutting propertieS.

By providing each of these cutting portions with different cuffing properties it is possible to further cut down the amount of work involved in cutting and chamfering an object being cut. For instance if the first of these cutting portions had a course abrasive surface and a second of these portions had a more fine refining abrasive surface, through a single forward and backward stroke of the hand tool the first highly abrasive surface can take off a great amount of the object. Then through the backward stroke the finer or more refining abrasive surface could smooth off this surface as is required if the object is for instance a pipe which is to be inserted into a plumbing collar or other object wherein a smooth almost perfect surface is required to form a good join.

Preferably the first and/or second cuffing surface may comprise a non cutting portion.

By the provision of a non cutting/spacer portion either between or at an end of the cutting portions of the first or second cutting edge, the amount of mechanical force needed to operate the device is reduced, which as indicated above may be important if the object comprises a great number of cuffing 3 0 surfaces with a correspondingly high demand of mechanical force.

Preferably a third cutting edge may comprise a non cutting portion.

According to a second aspect of the present invention there is a provided a cutting device which comprises at least a first and a second edge. The first edge of this cutting device is configured to cut the first region of an object. The second edge of this cutting device is configured to contact and interact with a second region of the object which is being cut. This invention is characterised in that the second edge of the cutting device is disposed substantially perpendicular to an axis formed through the first region of the object which is being cut and the first edge when such a first edge is in use specifically cutting said first region.

The provision of this second edge upon a cutting device, edge is disposed substantially perpendicular to an axis formed through interaction point of the first cutting edge and the first region of the object which is being cut, allows this second cutting edge to act as a guide for the first cutting edge. By providing this is second edge at a substantially perpendicular angle to this axis interaction, this allows once this second edge comes into contact with a second region of the object being cut to indicate to a user of the device whether or not a first edge as ??? the object in a squared off fashion or not. If a square cut has not been achieved through its first edge and the cutting device may be removed from the object and a new incision may be made into the object, Preferably a cutting device may comprise a third edge which is disposed on an opposite side of the axis to the second edge.

By providing a second and third edge, the accuracy of cut made by a first edge is further improved as when this second and third edge come into contact with the surface of the object being cut as these second and third edges are disposed on substantially opposite sides of the axis formed through said first axis relative to the object being cut. If this cut is not square either in a first or second opposite direction relative to this axis, the user of the device will be able to observe this via the non interaction of the second or third edge leaving them to 4 fl remove the device from the object being cut and retry at a square edge on their cut.

Preferably the second and third edges may be disposed substantially adjacent to each other.

Alternatively the second and third edges of a device may be disposed first distance apart and connected to the device via at least a first and second connecting arm.

Preferably the second and third edges may comprise: a substantially planar cross section; a substantially circular cross section; a substantially rectangular cross section.

Preferably the second edge may be adjustable relative to the first edge.

Preferably the third edge may be adjustable relative to the first edge and/or the second edge.

By allowing the second and/or third edge to be adjustable relative to both the first cutting edge and to each other, a configuration of device is possible which allows in the first instance the second and third edges to be substantially adjacent to each other and in contact with the first edge. The following incision into the object by the first edge and movement of this first edge further into the object as the incision increases, the second and third edges move away from this : 0 first edge so as to remain in contact the surface of the object. By allowing the second and third edges to be in contact with the object almost instantaneously after the first cutting edge has begun to cut the object, the user of the device can 4 fl

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almost immediately observe whether or not the first cutting edge has been inserted into the object so as to give a square cut edge or not so as decreasing the amount of work necessary so as to bring the second and third edges into contact with the object so as to observe whether or not the first cutting edge is keeping rise to a square edge or not.

Preferably the second edge may be spring loaded relative to the first edge.

Preferably the third edge may be spring loaded relative to the first edge.

Preferably the second cutting edge may be pivotally mounted upon said device relative to said first edge.

Preferably the third cutting edge may be pivotally mounted upon said device is relative to said first edge.

Preferably the cutting device may be a hand tool selected from the following: Tenant saw; Hack saw.

Preferably the second edge may be configured to be demountable from the cutting device.

Preferably the third edge may be configured to be demountable from the device.

Preferably a kit of parts may be provided for a cutting device according to the second specific aspect of the present invention.

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According to a further aspect of the present invention there may be provided an affixable edge or a cutting device, wherein the cutting device comprises a fixed cutting edge. This cutting edge being configured to act upon a first region of an object to be cut. Wherein the second fixable edge posed perpendicular to an axis formed through said first region and said first edge when said device is in use.

Preferably the cutting device is a hand tool and is selected from one of the following types: Tenent saw; Hack saw.

Alternatively the cutting device is a power tool and may be selected from one of the following types: Band saw; Mitor saw; Hand held saw.

According to a further aspect of the present invention, the invention also relates to a kit of parts for a cutting device according to any of the other aspects of the present invention.

According to a second aspect of the present invention there is provided an affixable cutting edge for a cutting device, the cutting device comprises a fixed cutting edge. The cutting edges are configurable to act upon a first region of an object to be cut. The affixable cutting edge is disposed at first distance from the fixed cutting edge. This affixable cutting edge is characterised in that it is configurable to cut the first region leaving a champered edge.

In addition therefore to a complete device comprising at least a first and second cutting edge, the invention also provides for a fixable second cutting edge which may be affixed to a handle power saw such that it performs the same two in one time and labour saving operation as indicated with respect to the previous aspects of the present invention.

io Brief Description of the Drawings

For a better understanding of the invention and to show how the same may be carried into effect, there will now be described by way of example only, specific embodiments, methods and processes according to the present invention with reference to the accompanying drawings in which: Figure 1 shows a schematic representation of a cutting device according to the first aspect of the present invention.

Figure 2 shows a schematic representation of front perspective view of a first aspect of the present invention.

Figure 3 shows a cutting device according to a first aspect of the present invention interacting with an object to be cut.

Figure 4 shows a schematic representation of a first aspect of the present invention showing the interaction of a first and second cutting edge with an object to be cut.

Figure 5 shows a cutting device according to a second specific aspect of the present invention.

Detailed Description

There will now be described by way of example a specific mode contemplated by the inventors. In the following description numerous specific details are set forth in order to provide a thorough understanding. It will be apparent however, to one skilled in the art, that the present invention may be practiced without limitation to these specific details. In other instances, well known methods and structures have not been described in detail so as not to

unnecessarily obscure the description.

According to a first specific embodiment of the present invention and with reference to figure 1 herein there is provided a cutting device 100. The cutting device 100 comprises a handle 101 and a saw blade 102. The saw blade 102 is attached to the handle via one or more fixation points, in this instance rivets although other forms of fixation are also considered suitable for instance gluing, welding, nut and bolts and screws. Different types of fixation means may be suitable for different operations, particularly if the saw blade 102 is removable from the handle 101 for sharpening operations or alternatively such that different saw blades may be used with the same handle.

The saw blade 102 comprises a first cutting edge 103. According to this first specific embodiment of the present invention the saw blade 102 is a solid piece of material. This material comprises one of a great many types of metal which have sufficient structural rigidity and other characteristics to operate as a saw blade. The first cutting edge 103 comprises a number of teeth formed into this edge of the saw blade. For operations involving the cutting of uPVC piping cutting edges comprising between 15 to 20 teeth per inch are considered best.

In operation the cutting device 100 is operated such that the teeth of the first cutting edge 103 are brought into contact with an object to be cut and via the operation of the handle the entirety of the cutting devices moved such that the first cutting edge and specifically the teeth thereof interact with the object to be cut causing an incision to be made into this object. 4 __1 -li-

The cuffing device 100 further comprises a second cutting edge 104. This second cutting edge 104 is disposed a first distance 105 from the first cuffing edge 103. According to this first specific embodiment of thepresent invention the second cuffing edge 104 runs the entire length of the saw blade 102 in the same way as the first cutting edge 103. Also the distance between the first cutting edge 103 and the second cutting edge 104 is constant along the length of the saw blade 102.

With reference to figure 2 herein, there is shown a front perspective view of an edge of the saw blade 102 at the opposite end of the saw blade 102 from where it joins the handle 101. As seen in figure 2 are the first cuffing edge 103, the second cuffing edge 104 and the first distance 105 which separates the first cuffing edge 103 from the second cutting edge 104. In addition there is also shown a third cuffing edge 201. This third cutting edge 201 is disposed upon an is opposite side of the saw blade 102 relative to the second cutting edge 104.

The second cuffing edge 104 and third cuffing edges 201 are off set relative to an axis formed through the first cutting edge 103 and the saw blade 102. The degree of off setting of the second 104 and third 201 cuffing edges relative to this axis may be set at the time of the cutting devices manufacture. Alternatively this off setting may be adjustable at any point allowing a user to modify the degree of off setting between the second and third cuffing edges relative to this axis at any time. this degree of off seffing affects the champher created in the object being cut by the device, in general the applicants consider a degree of off set between 40 to 500 to be optimal, although for certain operations a greater or lesser degree of off set may be required. In any case the degree of off set can only be in the range greater than 0 to less than 90 as a zero degree of off set would make no difference to the performance of the cutting device and likewise a degree of off set of 900 would only cause a wider incision to made into the object 3 o being cut without delivering any champhering to the edges being cut by the device. -10-

Within figure 3 it can be seen that the first and second cutting edges are substantially triangular in cross section and have been affixed to the saw blade.

The second and third cutting edges may be affixed to the saw blade permanently or alternatively they may be adjustable relative to the first cutting edge. This adjustment of the second and third cutting edges may result in a fixed second and third cutting edge relative to the first cutting edge at the end of each adjustment operation or alternatively the second and/or third cutting edge may be spring loaded upon the saw blade 102 such that they are relatively moveable in relation to the first cutting edge. Finally the second and/or third cutting edge may io also be pivotally mounted upon the saw blade as shown in figure 1. As shown therein the second cutting edge 104 is pivotally mounted upon the saw blade at pivot point 106 and is therefore capable of movement relative to the saw blade and in particular the first cutting edge about this pivot.

With reference to figure 3 herein there is shown a cutting device 100 cutting a circular pipe 301. In operation therefore the cutting device 100 may be used as follows, the first cutting edge 103 of the cutting device 100 is placed against a surface of a circular pipe which in this instance is the object to be cut. Via the operation of the handle the first cutting edge is moved relative to this first region of a circular pipe 301. Via the operation of the first cutting edge the cutting device makes an incision into a circular pipe. This incision continues until such time as the second and/or third cutting edges come into contact with the circular pipe. At this point the circular pipe is then turned towards the user such that as the first cutting edge continues to make an incision into the circular pipe, the second 2 s and/or third cutting edges champher the sides of the circular pipe on opposite sides of the incision.

With reference to figure 4 herein there is shown a front perspective view of the second and third cutting edges of the cutting device interacting with the circular pipe object which is being cut. As indicated previously the first cutting edge has formed an incision through the circular pipe and the remainder of the saw blade specifically the distance between the first cutting edge and the second

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and third cuffing edges has now passed into the interior of the object being cut.

The second and third cutting edges have therefore come into contact with the circular pipe. Due to the off set of the second and third cutting edges relative to the perpendicular axis formed through the saw blade relative to the first cutting edge the sides of the circular pipe on either side of the incision 401 and 402 respectively have been champhered due to the action of the second and third cuffing edges. In order to achieve this affect the second and third cutting edges may comprise a number of different surfaces. This may be a grinding, filing or abrasive surface. The exact composition of the second and third cutting services io will be dependent upon the material which makes up the object to be cut. For more resilient materials such as metals the composition of the second and third cuffing edges will need to be significantly more durable and abrasive than if the cutting device is to be used with resilient materials such as UPVC.

Once the circular pipe object has been cut along the entirety of the circumference, the pipe will then be in two pieces and both the first 401 and second side of the circular pipe will have a champhered edge. This champhered edge will be off set with respect to the surface of the circular pipe by an angle determined by a degree of off setting of the second and third cutting edge relative to the axis formed through the saw blade and the first cuffing edge.

With reference to figure 5 herein, there is shown a cuffing device 500 according to a second specific embodiment of the present invention. This cutting device comprises a handle 501 and a saw blade 502.

According to this second specific embodiment of the present invention, the saw blade 502 is curved and specifically the first cutting edge 503 of the saw blade 502 is curved in a concave manner. According to a second specific embodiment of the present invention the first cutting edge 503 again comprises a number of teeth formed into the structure of the saw blade 502. The number of teeth per inch is variable with different number of teeth per square inch being optimal for different materials which is to be cut by the cutting device 500.

The cutting device 500 further comprises a second cutting edge 504. This second cutting edge is disposed a distance 505 from the first cutting edge. In addition this second cutting edge is similarly curved as are the saw blade and the s first cutting edge such that the distance between the second cutting edge and the first cutting edge is constant along the length of the saw blade 502.

This curved saw blade is considered by the inventors to be better suited to certain types of cutting operations particularly those involving circular pipes or io other cylindrical structures. The saw blade 502 and its first and second cutting edges may be fixed relative to each other, alternatively the saw blade and first and second cutting edges may have a degree of flexibility either as a result of the material from which they are constructed or alternatively due to their relative construction. In particutar the second cutting edge may comprise some form of is adjustment means which allows it to be adjusted relative to the first cutting edge both in terms of its curvature and in terms of the relative distance between the first and second cutting edges. As indicated with respect to the first specific embodiment of the present invention, this cutting device 500 also comprises a third cutting edge not shown in figure 5 as this is disposed upon an opposite side of the saw blade 502 to that shown in figure 5. Both the second and third cutting edges are off set relative to an axis formed through the first cutting edge and the saw blade such that the second and third cutting edges are configured to interact with the sides of an incision made by the first cutting edge and to champher these first and second sides leading to a cut object with champhered edges.

With reference to figure 6 herein, there is shown a second specific aspect of the present invention. There is shown a cutting device 600, this cutting device 600 comprises a handle 601 and a saw blade 602. Disposed on the saw blade 601 is a first cutting edge 603. This first cutting edge is configured to interact with : 0 an object and cut this object via the preparation of the cutting device 600 in a reciprocal motion against the object which is to be cut.

This cutting device 600 further comprises a second cuffing edge 604. This second cuffing edge is also configured to interact with an object which is to be cut and cut said object via the reciprocal motion of said cuffing device relative to said object. This second cutting edge is disposed the first distance 605 away from a first cuffing edge 603.

According to this, the third aspect of the present invention, a first cutting edge 603 comprises a number of cutting portions 606 interspersed with a number of non cuffing portions 607. The exact number of cuffing and non cuffing portions upon the first cutting edge may be varied depending upon the material to be cut by the cutting device 600 or other factors.

According to this specific embodiment of the present invention these cuffing portions of the first cutting edge comprise a number of teeth as is normal for a saw. A non cutting portion 607 of the first cuffing edge 603, are entirely lacking in teeth or other types of cutting surface therefore are unable to cut an object. As this first cuffing edge of a cutting device 600 comprises portions which are configured to cut and portions which are not configured to cut, the total amount of mechanical force necessary to move the cutting device 600 through a normal cycle of reciprocal motion relative to an object to be cut is reduced relative to a cuffing device which did not comprise such non cuffing portions 607.

Each of these cuffing portions 606 of the first cuffing edge is configured to operate in a first direction of motion. This means each of these cuffing portions 606 is configured to cut said object whilst said device 600 is moving in a first direction of motion relative to the object which is to be cut.

With reference to the second cuffing edge 604 of cuthng device 600, this second cutting edge also comprises a number of discrete cuffing portions. With reference to this specific embodiment of the present invention the second cuffing edge comprises three cuffing portions, a first 608, a second 609 and a third 610 cutting portion. These first, second and third cuffing portions of a second cuffing edge are interspersed with non cuffing portions as per the first cutting edge. A provision of these distinct first, second and third cutting portions upon the second cuffing edge again reduces the total amount of mechanical force necessary to move the cutting device 600 through a normal reciprocal cycle of motion when the device is in use.

According to this third specific embodiment of the present invention, a first 608 and third 610 cuffing portions of the second cuffing edge are configured to be operable in a first direction of movement of the device 600 relative to an object which is to be cut. This means that when the device 600 is moved in a first direction relative to an object which is to be cut both the first 608 and third 610 cutting portions of the second cuffing edge interact and in size the object to be cut. The second cutting portion 609 of the second cuffing edge 604 does not interact operable with the object to be cut when the device 600 moves in this first direction of travel. This second cuffing portion 609 of the second cuffing edge 604 is operable to incise the object to be cut when said device moves in an opposite direction of travel from that of the other cutting portions of the second cutting edge as discussed previously. This opposite direction of travel is the reciprocal motion of the cuffing device 600 relative to the object to be cut.

As a further aspect of this third specific embodiment of the present invention as well as the first, second and third cuffing portions of the second cutting edge being operable in different directions of motion, these first, second and third cutting portions of the second cuffing edge may also have different cuffing properties. In particular the inventors consider it useful to have the first and third cuffing portions of the second cutting edge configured to be highly abrasive with respect to the object which is being cut. Whereas the second cutting portion 609 of the second cuffing edge 604 may be of a finer abrasive nature.

This allows in a single reciprocal stroke of the cutting device 600 upon the object to be cut for a first incision via the first and third portions of the second cutting edge to be made with the highly abrasive surfaces thereof so causing a great deal of material to be removed from the object and in the returning or reciprocal motion of the device 600, the finer edge of the second portion of the second cutting edge refines this cut surface.

It is necessary in order to allow certain cut objects to function properly that as well as comprising a chamfered edge they also comprise a finely finished edge, in particular if an object is to interact with another component for instance a plastic collar with internal rubber seal, a finely chamfered edge is required in order to allow the proper interaction of such a cut end with this collar. By 0 providing a cutting and chamfering device which comprises a both a highly and less abrasive cutting portions on the second cutting edge, it is possible to perform both the operation of chamfering the edge by removal of a large amount of material and the finishing of this edge to a high standard with a single tool in a single reciprocal stroke of the cutting device so saving time effort and the need for multiple tools to perform this task.

Further technical features relating to this specific embodiment of the present invention may be as per both the first and second specific embodiments of the present invention as discussed previously. Further both the first and third cutting edges may comprise portions configured to act in opposite directions relative to each other and instead of having spacing portions disposed between the different cutting portions of a cutting edges, these facing portions may be removed so providing a single unified cuffing edge but with a number of different portions configured to cut an object in different directions of movement during the reciprocal motion of the cuffing device 600.

With reference to figure 7 herein, there is shown according to a fourth specific aspect of the present invention a further cutting device 700. This cutting device 700 comprises a handle 701 and a saw blade 702. The cutting device 3 0 also comprises a first cutting edge 703 which comprises a number of teeth configured to interact with an in size object which is to be cut by the cuffing device 700. This cutting device 700 further comprises a second cutting edge disposed a first distance 705 away from the first cutting edge 703. The first and second cutting edges are configured to interact with a region of the object to be cut by the device and via the reciprocal motion of the cuffing device relative to this object to be cut to both cut the object and provide chamfered edges of one or both sides of this cut as per previous embodiments of the present invention.

This embodiment further comprises a first guiding edge 706. This first guiding edge is provided on the surface of said second cutting edge 704. This first guide edge 706 is provided substantially horizontal with said first cutting edge 703 and is disposed upon the entire length of said saw blade 702. This first guide edge 706 is configured to interact with the surface of an object 707 which is being cut and chamfered by the cuffing device 700. The first guide edge 706 project outwards from the surface of the saw blade 702 and as it does not comprise any type of cutting surface prevent the further inward motion of the cuffing device specifically the saw blade and its first cutting edge into the object 707.

With reference to figure 8 herein, there is shown a close up view of portion of said second cutting edge 704 as comes into proximity with said object 707.

As seen from figure 8 the second cuffing edge 704 comprises a substantially triangular cross section with an abrasive surface upon this second cuffing edge wherein it interacts with said object 707. Disposed upon an upper region of this second cutting edge 704 is the first guide edge 706.

According to this specific embodiment of the present invention its first guide edge 706 is substantially circular in cross section and does not comprise any form of abrasive or cuffing properties. Therefore as the cuffing device 700 and specifically the saw blade 702 of said cutting device 700 move through said object 707 in a downwards direction, the second cutting edge 704 via its abrasive surface chamfers the edge of the object being cut, once the guide edge 706 contacts an upper surface of the object being cut 707 the further incision into the object is prevented.

This first guide edge 706 therefore can have at least two different functions in respect of this cutting device. The first of these functions is to limit the amount of the second cutting edge which can come into contact with the object to be cut s so preventing over cutting of the object by this second cutting edge.

Alternatively as this side edge 706 is disposed substantially perpendicular to an axis running through the first edge where it interacts with portion or region of the object which is being cut and this axis running substantially up through a saw blade 702, if the first edge and specifically the saw blade in this instance has not made a square incision with respect to a surface of the object 707 which is being cut, this guide edge will not rest properly on the surface of said object so allowing a user of the device 700 to observe that a non square cut has been made by the cutting device allowing them to remove the cutting device 700 from the object 707 and make a fresh incision this time taking more care to ensure a square cut is made.

With reference to figure 9 herein there is shown a further specific embodiment of the present invention. There is shown a cutting device 900, this cutting device 900 comprises a saw blade 901 which is shown in a face on perspective view in figure 9. This saw blade 901 comprises a cutting edge 902, this cutting edge is configured to interact with and inside an object of which the cutting device 900 is to be used.

This cutting device further comprises a first and second cutting edge 903 and 904 respectively. According to this further aspect of the present invention these first and second guide edges are substantially planar in cross section and configured to rest upon a surface of the object which is being cut.

These first and second guide edges 903 and 904 respectively are connected to the saw blade 901 via first and second connecting arms 905 and 906 respectively. These first and second connecting arms are configured to allow the first and second guiding edges 903 and 904 be disposed substantially perpendicular to an axis formed through cuffing edge 902 where it interacts with a surface of an object 907 which is to be cut by the cutting device 900.

As the first and second guide edges are disposed substantially perpendicular to this axis, they are configured to rest upon a surface of the object 907 which is to be cut. If a cutting device 900 has not formed a square cut with respect to the object 907 which is to be cut, either a first or the second guide edge will not contact with a surface of the object 907 which is being cut. This lack of contact will alert a user of the device 900 to the fact that a non square cut has been made into the object being cut 907 allowing the user to withdraw the cutting device 900 and restart the cutting process.

As a further aspect of this particular embodiment of the invention, the is inventors consider it possible to mount first and second guiding edges and their associated first and second arms which are capable of movement relative to the saw blade 901 remaining in a substantially perpendicular orientation thereto.

This adjustment mechanism may comprise in its simplest a first and second arms being connected to a collar fitted about a saw blade 901 and capable of movement relative thereto in respect of the axis previously defined between the surface of the object being cut 907 and the cuffing edge 902 moving through the saw blade 901.

Alternatively a more complex mechanism may be provided involving spring loading the first and second guiding edges and their respective arms relative to a cuffing edge and saw blade again such that a first and second guiding edges are only capable of movement upon this axis and not so as to deviate from the axis previously defined.

Similar mechanism may be used if the first and second guiding edges do not comprise arms and are disposed substantially adjacent to each other on opposite sides of the saw blade. Similarly if a cutting device does not comprise a saw blade for instance the device is a hack saw, then the cutting device may also comprise these first and second guiding edges but some mechanism must be provided to allow their movement to be controlled relative to the axis defined through the first cutting edge and to the object being cut.

The inventors also consider it useful the feature of this invention to allow the first and second cutting edges and/or the first and second guiding edges where appropriate to be demountably fixed to the cutting device. By allowing these edges to be demountably fixed to the cutting device an exisitng cutting device may be retrofitted such that to perform the cutting and chamfering action described herein or could be configured to improve the efficiency of cutting square edges into objects using an existing cutting device. Alternatively the effective or cutting edges and/or guiding edges can be replaced without the need to replace the entirety of the cutting device so saving costs. Also the removal of these edges allow single tool to be used for multiple purposes wherein one object requires cutting simply in half and does not require any type of chamfering whereas a second object on a single work site requires both cutting and chamfering. An operator therefore only needs one tool with a set of demountable edges as per the current invention as oppose to at least two tools, one with and one without the edges of the current invention.

In addition to cutting devices based upon hand tools, the invention is also applicable to power tools, for instance mitor saws or hand held cutting devices such as the Black and Decker Alligator. In that instance, the second and/or third cutting edges are formed again upon the saw blade of those devices. A first distance from the first cutting edge which is then used to make an incision into an object to be cut, the second and/or third cutting edges of such power tool saw blades are again off set relative to an axis formed through the first cutting edge and the saw blade such that when the saw blade interacts with an object to be cut, the first incision is made by the first cutting edge and following interaction of the second and/or third cutting edge with the sides of this incision, the power tool saw blade causes champhered edges to be formed upon these first and second sides of the incision into the object being cut.

In particular the inventors consider their new type of cutting device to be useful when cuffing in particular any type of pipe or structure wherein champhered edge is required to form a join with a second object. They therefore consider their invention to be particularly suited to use with plumbing, piping in particular sewage, down pipes and mains water pipes. They also consider their cuffing device to be suitable for use with dial bars, copper pipes and box sections.

Claims

Claims: 1. A cuffing device comprising at least a first and a second

cuffing edge, said cuffing edges being configured to act upon a first region of an object to be cut; wherein said second cuffing edge is disposed of a first instance from said is first cuffing edge; characterised in that said second cutting edge is configurable to cut said first region leaving a chamfer edge.

2. A cuffing device is claimed in claim 1, wherein said second cuffing edge is off set relative to a perpendicular axis to said first region through said first cuffing edge.

3. A cuffing device as claimed in claim 2, wherein said second cuffing edge is off set by an angle of 40 to 50 C.

4. A cutting device is claimed in any one of claims 1, 2 or 3 wherein said second cuffing edge has a substantially triangular cross section.

5. A cuffing device is claimed in any one of claims 1, 2 or3 wherein said second cutting edge has a substantially semi circular cross section.

IL .J -.

6. A cutting device as claimed in any one of claims 1 to 5 wherein said second cuffing edge comprises one of the following surfaces: grinding; filing; abrasive.

7. a cutting device as claimed in any preceding claim, comprising a third cutting edge disposed on an opposite side of a perpendicular axis to said first region through said first cuffing edge.

8. A cutting device as claimed in claim 7, wherein said third cuffing edge is disposed said first distance from said first cuffing edge.

9. A cuffing device as claims in claim 7, wherein said third cutting edge is at a second distance from said first cutting edge.

10. A cuffing device as claimed in any one of claims 7, 8 or 9 wherein said third cuffing edge is off set relative to said perpendicular axis.

11. A cutting device as claimed in claim 10, wherein said third cutting edge is off set by an angle of 40 to 5000.

12. A cutting device is claimed in any one of claims 7 to 11, wherein said third cuffing edge has a substantially triangular cross section.

13. A cutting device is claimed in any one of claims 7 to 11, wherein said third cutting edge has a substantially semi circular cross section. sJ -

14. A cuffing device as claimed in any preceding claim wherein said second cuffing edge is adjustable relative to said first cutting edge.

15. A cuffing device as claimed in any one of claims 7 to 14 wherein said third cutting edge is adjustable relative to said first cutting edge.

16. A cutting device as claimed in any preceding claim wherein said second cutting edge is spring loaded relative to said first cuffing edge.

17. A cuffing device as claimed in any one of claims 7 to 16 wherein said third cuffing edge is spring loaded relative to said first cuffing edge.

18. A cutting device as claimed in any preceding claim wherein said second cuffing edge is pivotally mounted relative to said first cutting edge.

19. A cutting device as claimed in any one of claims 7 to 18 wherein said third cutting edge is pivotally mounted relative to said first cuffing edge.

20. A cuffing device is claimed in any preceding claim wherein said second cuffing edge is configured to be demountable from said device.

21. A cutting device as claimed in any one of claims 7 to 20, wherein said third cutting edge is configured to be demountable from said device.

22. A cuffing device as claimed in any preceding claim wherein said first cuffing edge comprises at least one portion up above the cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

23. A cuffing device as claimed in any preceding claim wherein said second cutting edge comprises at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

24. A cutting device as claimed in any one of claim 7 to 23, wherein said third cutting edge comprises at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

25. A cutting device as claimed in any preceding claim wherein said first cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction substantially opposite to the operable direction of at least one cutting portion of said second cutting edge.

26. A cutting device as claimed in any one of claims 7 to 25, wherein said first cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction of substantially opposite to the operable direction of at least one cutting portion of said third cutting edge.

27. A cutting device as claimed in any one of claims 7 to 26, wherein said second cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction substantially opposite to the operable direction of at least one cutting portion of said third cutting edge.

28. A cutting device as claimed in any preceding claim, wherein said first cutting edge comprises at least two cutting portions and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

29. A cutting device as claimed in any preceding claim wherein said second cutting edge comprises at least two cutting portions, and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

30. A cutting device as claimed in any one of claims 7 to 29, wherein said third cutting edge comprises at least two cutting portions, and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

31. A cutting device as claimed in any one of claims 28, 29 or 30 wherein said two cutting portions have different cutting properties.

32. A cutting device according to any preceding claim wherein said first cutting edge or said second cutting edge comprise a non cutting portion.

33. A cutting device according to any one of claims 7 to 32 wherein said third cutting edge comprise a non cutting portion.

34. A cutting device as claimed in any preceding claim wherein said cutting device is a hand tool selected from the following: tenant saw; hack saw.

35. A cutting device wherein said first cutting edge is substantially curved.

36. A cutting device as claimed in any one of claims 1 to 33 wherein said cutting device is a power tool selected from the following: band saw; mitre saw; hand held electric saw; angle grinder.

37. A kit of parts for a cutting device according to any preceding claim.

38. An affixable cutting edge for a cutting device, said cutting device comprising a fixed cutting edge.

Said fixed cutting edge being configurable to act upon a first region of an object to be cut; wherein said affixable cutting edge is disposable a first distance from said fixed cutting edge; characterised in that said affixable cutting edge is configurable to cut said first region leaving a chamfer edge.

40. A cutting device comprising at least a first and a second edge, wherein said first edge is configured to cut a first region of an object; and wherein said second edge is configured to contact a second region of said object; characterised in that said second edge is disposed upon a device substantially perpendicular to an axis formed through said first region and said first edge when said device is in use.

41. A cutting device is claimed in claim 39, comprising a third edge disposed on an opposite side of said axis to said second edge.

42. A cutting device as claimed in claim 40, wherein said second and said third edges are disposed substantially adjacent to each other.

42. A cutting device as claimed in claim 40, wherein said second and s said third edges are disposed a first distance apart and connected to said device via at least a first and a second connecting arm.

43. A cutting device as claimed in any one of claims 40, 41 or 42, wherein said second and said third edge may comprise: a substantially planar section; a substantially circular cross section; is a substantially rectangular cross section; 44. A cutting device as claimed in any one of claims 39 to 43, wherein said second edge is adjustable relative to said first edge.

45. A cutting device as claimed in any one of claims 40 to 44, wherein said third edge is adjustable relative to said first edge.

46. A cutting device as claimed in any one of claims 39 to 45 wherein said second cutting edge is spring loaded relative to said first cutting edge.

47. A cutting device is claimed in any one of claims 40 to 46, wherein said third edge is spring loaded relative to said first cutting edge.

48. A cutting device as claimed in any one of claims 39 to 47, wherein said second edge is pivotally mounted relative to said first edge. s.) -

49. A cuthng device is claimed in any one of claims 40 to 48, wherein said third edge is pivotally mounted relative to said first edge.

50. A cutting device as claimed in any one of claims 39 to 49 wherein said cutting device is a hand tool selected from the following: tenon saw; hack saw.

51. A cutting device as claimed in any one of claims 39 to 50 wherein said second edge is configured to be demountable from said device.

52. A cutting device as claimed in any one of claims 39 to 51 wherein is said third edge is configured to be demountable from said device.

53. A kit of parts for a cutting device according to any one of claims 39 to 52.

54. An affixable edge for a cutting device, said cutting device comprising a fixed cutting edge; said fixed cutting edge being configurable to act upon a first region of an object; said affixable edge being configured to contact a second region of said object; characterised in that said affixable edge is disposed perpendicular to an axis formed through said first region and said fixed edge when said device is in use.

Amendments to the claims have been filed as follows 3? 1. A cutting device configured to cut an object solely due to force applied to said device by an operator, said cutting device comprising at least a first and a second cutting edge, said cutting edges being configured to act upon a first region of an object to be cut; wherein said second cutting edge is disposed of a first distance from said first cutting edge; said second cutting edge being configurable to cut said first region leaving a chamfer edge; characterised in that said second edge is spring loaded relative to said first is cutting edge.

2. A cutting device as claimed in claim 1, wherein said second cutting edge is off set relative to a perpendicular axis to said first region through said first cutting edge.

3. A cutting device as claimed in claim 2, wherein said second cutting edge is off set by an angle of 40 to 50 0 4. A cutting device as claimed in any one of claims 1, 2 or 3 wherein said second cutting edge has a substantially triangular cross section.

5. A cutting device as claimed in any one of claims 1, 2 or 3 wherein said second cutting edge has a substantially semi circular cross section.

6. A cutting device as claimed in any one of claims I to 5 wherein said second cutting edge comprises one of the following surfaces: P1624. spec as amended Dec 2006 grinding; filing; abrasive.

7. A cutting device as claimed in any preceding claim, comprising a third cutting edge disposed on an opposite side of a perpendicular axis to said first region through said first cutting edge.

8. A cutting device as claimed in claim 7, wherein said third cutting edge is disposed said first distance from said first cutting edge.

9. A cutting device as claimed in claim 7, wherein said third cutting edge is at a second distance from said first cutting edge.

10. A cutting device as claimed in any one of claims 7, 8 or 9 wherein said third cutting edge is off set relative to said perpendicular axis.

11. A cutting device as claimed in claim 10, wherein said third cutting edge is off set by an angle of 40 to 500.

12. A cutting device as claimed in any one of claims 7 to 11, wherein said third cutting edge has a substantially triangular cross section.

13. A cutting device as claimed in any one of claims 7 to 11, wherein said third cutting edge has a substantially semi circular cross section.

14. A cutting device as claimed in any preceding claim wherein said second cutting edge is adjustable relative to said first cutting edge.

P1624. spec as amended Dec 2006 3',' 15. A cutting device as claimed in any one of claims 7 to 14 wherein said third cutting edge is adjustable relative to said first cutting edge.

16. A cutting device as claimed in any one of claims 7 to 15 wherein said third cutting edge is spring loaded relative to said first cutting edge.

17. A cutting device as claimed in any preceding claim wherein said second cutting edge is pivotally mounted relative to said first cutting edge.

18. A cutting device as claimed in any one of claims 7 to 17 wherein said third cutting edge is pivotally mounted relative to said first cutting edge.

19. A cutting device as claimed in any preceding claim wherein said second cutting edge is configured to be demountable from said device.

20. A cutting device as claimed in any one of claims 7 to 19, wherein said third cutting edge is configured to be demountable from said device.

21. A cutting device as claimed in any preceding claim wherein said first cutting edge comprises at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

22. A cutting device as claimed in any preceding claim wherein said second cutting edge comprises at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

P1624. spec as amended Dec 2006 23. A cutting device as claimed in any one of claim 7 to 22, wherein said third cutting edge comprises at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

24. A cutting device as claimed in any preceding claim wherein said first cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction substantially opposite to the operable direction of at least one cutting portion of said second cutting edge.

25. A cutting device as claimed in any one of claims 7 to 24, wherein said first cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction of substantially opposite to the operable direction of at least one cutting portion of said third cutting edge.

26. A cutting device as claimed in any one of claims 7 to 25, wherein said second cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction substantially opposite to the operable direction of at least one cutting portion of said third cutting edge.

27. A cutting device as claimed in any preceding claim, wherein said first cutting edge comprises at least two cutting portions and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

28. A cutting device as claimed in any preceding claim wherein said second cutting edge comprises at least two cutting portions, and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

P1 624. spec as amended Dec 2006 29. A cutting device as claimed in any one of claims 7 to 28, wherein said third cutting edge comprises at least two cutting portions, and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

30. A cutting device as claimed in any one of claims 27, 28 or 29 wherein said two cutting portions have different cutting properties.

31. A cutting device according to any preceding claim wherein said first cutting edge or said second cutting edge comprise a non cutting portion.

32. A cutting device according to any one of claims 7 to 31 wherein said third cutting edge comprise a non cutting portion.

33. A cutting device as claimed in any preceding claim wherein said cutting device is selected from the following: tenon saw; hacksaw.

34. A cutting device as claimed in any preceding claim wherein said first cutting edge is substantially curved.

35. A kit of parts for a cutting device configured to cut an object solely due to force applied to said device by an operator, said cutting device comprising at least a first and a second cutting edge, said cutting edges being configured to act upon a first region of an object to be cut; P1 624. spec as amended Dec 2006 LVZ, wherein said second cutting edge is disposed of a first distance from said first cutting edge; said second cutting edge being configurable to cut said first region leaving a chamfer edge; characterised in that said second cutting edge is spring loaded relative to said first cutting edge.

36. A kit of parts for a cutting device as claimed in claim 35, wherein said second cutting edge is off set relative to a perpendicular axis to said first region through said first cutting edge.

37. A kit of parts for a cutting device as claimed in claim 36, wherein said second cutting edge is off set by an angle of 40 to 50 0 38. A kit of parts for a cutting device as claimed in any one of claims 35, 36 or 37 wherein said second cutting edge has a substantially triangular cross section.

39. A kit of parts for a cutting device as claimed in any one of claims 35, 36 or 37 wherein said second cutting edge has a substantially semi circular cross section.

40. A kit of parts for a cutting device as claimed in any one of claims 35 to 39 wherein said second cutting edge comprises one of the following surfaces: grinding; filing; P1624. spec as amended Dec 2006 abrasive.

41. A kit of parts for a cutting device as claimed in any one of claims 35 to 40, comprising a third cutting edge disposed on an opposite side of a perpendicular axis to said first region through said first cutting edge.

42. A kit of parts for a cutting device as claimed in claim 41, wherein said third cuffing edge is disposed said first distance from said first cutting edge.

43. A kit of parts for a cutting device as claimed in claim 41, wherein said third cuffing edge is at a second distance from said first cuffing edge.

44. A kit of parts for a cutting device as claimed in any one of claims 41, 42 or 43 wherein said third cutting edge is off set relative to said perpendicular axis.

45. A kit of parts for a cuffing device as claimed in claim 44, wherein said third cutting edge is off set by an angle of 40 to 500.

46. A kit of parts for a cuffing device as claimed in any one of claims 41 to 45, wherein said third cutting edge has a substantially triangular cross section.

47. A kit of parts for a cuffing device as claimed in any one of claims 41 to 45, wherein said third cutting edge has a substantially semi circular cross section.

48. A kit of parts for a cutting device as claimed in any one of claims to 47 wherein said second cutting edge is adjustable relative to said first cutting edge.

P1 624. spec as amended Dec 2006 49. A kit of parts for a cutting device as claimed in any one of claims 41 to 48 wherein said third cutting edge is adjustable relative to said first cutting edge.

50. A kit of parts for a cutting device as claimed in any one of claims 41 to 49 wherein said third cutting edge is spring loaded relative to said first cutting edge.

51. A kit of parts for a cutting device as claimed in any one of claims 35 to 50 wherein said second cutting edge is pivotally mounted relative to said first cutting edge.

52. A kit of parts for a cutting device as claimed in any one of claims 41 to 51 wherein said third cutting edge is pivotally mounted relative to said first cutting edge.

53. A kit of parts for a cutting device as claimed in any one of claims 35 to 52 wherein said second cutting edge is configured to be demountable from said device.

54. A kit of parts for a cutting device as claimed in any one of claims 41 to 53, wherein said third cutting edge is configured to be demountable from said device.

55. A kit of parts for a cutting device as claimed in any one of claims 35 to 54 wherein said first cutting edge comprises at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

56. A kit of parts for a cutting device as claimed in any one of claims 35 to 55 wherein said second cutting edge comprises at least one portion operable P1624. spec as amended Dec 2006 to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

57. A kit of parts for a cutting device as claimed in any one of claim 41 to 56, wherein said third cutting edge comprises at least one portion operable to cut said object in a first direction of movement, and at least one portion not configured to cut said object in said first direction of movement.

58. A kit of parts for a cutting device as claimed in any one of claims 35 to 57 wherein said first cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction substantially opposite to the operable direction of at least one cutting portion of said second cutting edge.

59. A kit of parts for a cutting device as claimed in any one of claims 41 to 58, wherein said first cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction of substantially opposite to the operable direction of at least one cutting portion of said third cutting edge.

60. A kit of parts for a cutting device as claimed in any one of claims 41 to 59, wherein said second cutting edge comprises at least one cutting portion operable to cut said object when moved in a direction substantially opposite to the operable direction of at least one cutting portion of said third cutting edge.

61. A kit of parts for a cutting device as claimed in any one of claims 35 to 60, wherein said first cutting edge comprises at least two cutting portions and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

62. A kit of parts for a cutting device as claimed in any one of claims 35 to 61 wherein said second cutting edge comprises at least two cutting portions, P1624. spec as amended Dec 2006 and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

63. A kit of parts for a cutting device as claimed in any one of claims 41 to 62, wherein said third cutting edge comprises at least two cutting portions, and said at least two cutting portions are configured to cut said object in substantially opposite directions of movement.

64. A kit of parts for a cutting device as claimed in any one of claims 61, 62 or 63 wherein said two cutting portions have different cutting properties.

65. A kit of parts for a cutting device according to any one of claims 35 to 64 wherein said first cutting edge or said second cutting edge comprise a non cutting portion.

66. A kit of parts for a cutting device according to any one of claims 41 to 65 wherein said third cutting edge comprise a non cutting portion.

67. A kit of parts for a cutting device as claimed in any one of claims 35 to 66 wherein said cutting device is selected from the following: tenon saw; hack saw.

68. A kit of parts for a cutting device as claimed in any one of claims 35 to 67 preceding claim wherein said first cutting edge is substantially curved.

69. An affixable cutting edge for a cutting device, said cutting device comprising a fixed cutting edge, P1624. spec as amended Dec 2006 sald cutting edges being configurable to act upon a first region of an object tobecut; wherein said affixable cuthng edge Is disposable a first distance from said fixed cutting edge; characterised In that said affixable cutting edge Is configurable to cut said first region leaving a chamfer edge.

P1624.upscsanhtIdIdDSC2006