Abstract
A cutting apparatus for cutting an item supported by a surface, comprising a knife (1) comprising a blade (2), a blade support means (3), and an alignment guide (4), having an arm (7) pivotally attached to the knife and a surface contacting means (8) extending in a direction substantially perpendicular to the longitudinal plane of the knife and adapted to contact the surface in front of the blade, in the cutting direction so that, in use, the alignment guide can move with the blade, as the blade cuts into an item whereby if the knife tilts or tends to tilt, this is resisted by virtue of the alignment guide or, if the resistance is overcome, is reduced by raising of one or other lateral edges of the surface contacting means.
Claims
1-16. (canceled)
17. A cutting apparatus for cutting an item supported by a surface, comprising a bow knife comprising a blade, a blade support means, and an alignment guide, having an arm pivotally attached to the knife and a surface contacting means extending in a direction substantially perpendicular to the longitudinal plane of the knife and adapted to contact the surface in front of the blade, in the cutting direction so that, in use, the alignment guide can move with the blade as the blade cuts into an item, whereby, if the bow knife tilts or tends to tilt, this is resisted by virtue of the alignment guide and, if the resistance is overcome, causes raising of one or other lateral edges of the surface containing means.
18. A cutting apparatus as claimed in claim 17, wherein the surface contacting means is pivotally attached to the arm so that, in use, the surface contacting means is free to rotate about a rotation axis.
19. A cutting apparatus as claimed in claim 17, wherein the surface contacting means is adapted to roll or slide along the surface when the bow knife is moved longitudinally to the surface.
20. A cutting apparatus as claimed in claim 17, wherein the arm pivots relative to the bow knife and the surface contacting means pivots relative to the arm.
21. A cutting apparatus as claimed in any one of claim 17, wherein the surface contacting means moves along the surface when the bow knife is used to cut an item on a surface such that tilting of the bow knife causes tilting of the surface contacting means, to thereby provide feedback to the user.
22. A cutting apparatus as claimed in claim 17, wherein the arm of the alignment guide is connected to a distal end of the bow knife.
23. A cutting apparatus as claimed in claim 17, wherein the arm extends at an angle other than zero relative to the longitudinal direction of the blade to help balance weight across the knife.
24. A cutting apparatus as claimed in claim 17, wherein the surface contacting means has a generally circular cross-section having a first end, a second end and a middle portion.
25. A cutting apparatus as claimed in claim 24, wherein the diameters at the first and second end of the surface contacting means are greater than the diameter at the middle portion to help stabilise the surface contacting means along the surface.
26. A cutting apparatus as claimed in claim 17, wherein the surface contacting means is a roller, adapted to rotate around a rotation axis which is, substantially perpendicular to the longitudinal axis of the blade.
27. A cutting apparatus as claimed in claim 17, wherein the blade has a longitudinal axis and the centre of the surface contacting means lies along the longitudinal axis.
28. A cutting apparatus as claimed in claim 17, wherein the arm is pivotally attached to a side of the bow knife.
29. A cutting apparatus as claimed in claim 17 which is a bread knife.
30. A cutting apparatus as claimed in claim 17 wherein the surface contacting means comprises a shaft extending in a direction generally perpendicular to the longitudinal cutting direction of the bow knife, and having a roller at or towards each end.
31. A method of preventing or reducing tilt of a bow knife, comprising providing a knife as claimed in claim 17, positioning this upon an item to be cut, which is supported by a surface, positioning the alignment guide so that the surface contacting means contacts the surface in front of the blade, and using mechanical and/or visual feedback from the alignment means to prevent or reduce tilt.
Description
[0025] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying figures, in which:
[0026] FIG. 1 shows a bread knife;
[0027] FIG. 2 shows a second embodiment of the knife, as a bow-type bread knife, in accordance with the present invention;
[0028] FIG. 3 illustrates another view of the bow knife in FIG. 2;
[0029] FIG. 4 illustrates a perspective view of the bow knife in FIG. 2;
[0030] FIG. 5 illustrates the bow knife of FIG. 2 cutting bread;
[0031] FIG. 6a illustrates an alignment guide;
[0032] FIG. 6b illustrates a second embodiment of alignment guide;
[0033] FIG. 6c illustrates a third embodiment of alignment guide;
[0034] FIG. 7a illustrates an angle an arm makes with the longitudinal axis of the knife;
[0035] FIG. 7b further illustrates another angle the arm makes with the longitudinal axis of the knife, as cutting progresses, and;
[0036] FIG. 8 illustrates a further embodiment.
[0037] Referring to FIG. 1 a knife in accordance with the present invention is shown, indicated generally as 1. The knife 1 has a blade 2, blade support means (handle) 3 and an alignment guide 4. The knife 1 has a distal end 5 and a proximal end 6. The alignment guide 4, in this particular embodiment, is pivotally attached to the distal end 5 of the knife 1. The alignment guide 4 is not limited to this configuration and may be attached to any part of the knife 1. The alignment guide 4 consists of an arm 7 and a surface contacting means 8. The arm is pivotally attached to the knife to freely pivot relative thereto and extends generally therefrom in use.
[0038] FIG. 2 shows a specific type of knife, a bow knife 9, in accordance with the present invention. The bow knife 9 has a blade 10, a blade support means 11, a handle 11a and an alignment guide 12 pivotally attached to a distal end 13 of the bow knife 9. The blade support means 11 has a hole 14 extending through a portion of the blade support means 11 which is defined by a hole axis 15. The alignment guide 12 consists of an arm 16 and a surface contacting means 17. The arm 16 is pivotally attached to the blade support means 11 by being inserted into the hole 14 from the side of the blade support means 11 in which the blade 10 is located. The arm extends at an angle from the distal end. The clip 18 is placed on the arm 16 at the other end of the blade support means 11 to fix the arm 16 to the blade support means 11. The method of securing the alignment guide 12 to the bow knife 9 (or knife 1) is not limited to using a clip 18 and other fixing apparatus may be used, such as a nut and bolt mechanism, which can allow free pivotal motion. The arm 16 can rotate freely about the hole axis 15. The arm 16 extends laterally outwardly at an angle to the distal end 13 of the bow knife 9 to help balance the entire bow knife 9 as the arm 16 and blade support means 11 are the heaviest elements of the bow knife 9. This will improve the weight distribution across the bow knife 9.
[0039] The surface contacting means 17, in this particular embodiment, is a roller 19 which is pivotally attached to the arm 16 so that it may rotate freely about a rotation axis 20 which lies with its axis of rotation perpendicular to the longitudinal axis of the blade 10. The rotation axis 20 and hole axis 15 thus may be generally parallel to each other, but are both perpendicular to the blade 10.
[0040] As seen in FIG. 3, the alignment guide 12 can be pivoted to be placed in a position on top of the blade 10 and blade support means 11 for easy storage as it takes a reduced amount of space. It may also be easily removed entirely therefrom, so that the knife can be used conventionally without it.
[0041] Referring to FIG. 4, a perspective view of the bow knife 9 is shown.
[0042] FIG. 5 shows the bow knife 9 being used to cut bread 21. The bread 21 is placed on a surface 22 and the roller (surface contacting means) 19 of the alignment guide 12 is placed on the surface 22. The bow knife 9 is then moved along a longitudinal direction 23, whilst the roller 19 also moves along the longitudinal direction 23 with a side surface 24 of the roller 19 placed flat on the surface 22 as it rolls on the surface 22. The hole axis 15 and rotation axis 20 are perpendicular to the blade 10 and longitudinal direction 23. This reduces the tilting movement of the blade 10 when the bow knife 9 is used to cut the bread 21.
[0043] FIG. 6a illustrates one embodiment of the alignment guide 12 consisting of the arm 16 and surface contacting means 17. The surface contacting means 17, as shown in FIGS. 2 to 5, is a roller 19 which rotates freely about a rotation axis 20. The roller 25 shown in FIG. 6a also rotates freely about a rotation axis 20 but also has a first end 26, a middle portion 27 and a second end 28. The diameters at the first 26 and second end 28 are greater than the diameter of the middle portion 27. This helps stabilise the movement of the roller 25 along the surface 22 when the bow knife 9 is cutting an object placed on the surface 22.
[0044] FIG. 6b illustrates a second embodiment of the alignment guide 12 which comprises an arm 29 and surface contacting means 17. The surface contacting means comprises of two spaced apart rollers 30 on a central support 33 that are free to rotate about a rotation axis 20. More than two rollers may be located on the support 33. Support 33 may rotate with the rollers or may be a fixed axle upon which the rollers are mounted by bearings, for example, so that they can freely rotate relative to it.
[0045] FIG. 6c illustrates a third embodiment of the alignment guide 12 comprising an arm 31 and a surface contacting means 17. The surface contacting means 17 in this embodiment is a slider 32. This slider 32 is fixed to the arm 31 and cannot rotate relative to the arm 31. The slider 32 is placed on the surface 22 when the bow knife 9 is used to cut an item placed on the surface 22. The slider 32 can then slide along the surface 22 to provide support to the entire bow knife 9. The slider will of course be formed of, or at least have a face of, a low friction material which can slide on a work surface or chopping board, such as a plastic material, for example Nylon or Teflon. The slide can be of any shape.
[0046] FIGS. 7a and 7b illustrate the angle made between the arm and the longitudinal direction. As the knife descends, when cutting an item (e.g. cutting bread as shown in the figure), the arm and roller or slider pivot so that the angle the arm makes with the longitudinal axis of the knife decreases as the roller or slider continues to move along the surface.
[0047] FIG. 8 shows an embodiment in which two rollers 30 are provided on an arm 50, which is part of a T shaped construction with shaft 51. A T shaped constructed may also be used where there is only one roller.
[0048] Of course, the item to be cut may be placed on a plate or board (e.g. bread board) on which is itself on a worktop or, table or other surface. The roller or other surface contacting means may extend beyond the edge of the board and roll on the worktop, table etc. This is still a support for the item, albeit via a secondary support (breadboard).
[0049] The above embodiment of the present invention have been described by way of example only and it will be apparent to those skilled in the art that modifications may be made without departing from the scope of the appended claims.
