WO2003061919A1 - Device for cutting board - Google Patents

Device for cutting board Download PDF

Info

Publication number
WO2003061919A1
WO2003061919A1 PCT/FI2003/000048 FI0300048W WO03061919A1 WO 2003061919 A1 WO2003061919 A1 WO 2003061919A1 FI 0300048 W FI0300048 W FI 0300048W WO 03061919 A1 WO03061919 A1 WO 03061919A1
Authority
WO
WIPO (PCT)
Prior art keywords
board
blades
slot
cut
cutting
Prior art date
Application number
PCT/FI2003/000048
Other languages
French (fr)
Inventor
Erkki Karvinen
Original Assignee
Erkki Karvinen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Erkki Karvinen filed Critical Erkki Karvinen
Publication of WO2003061919A1 publication Critical patent/WO2003061919A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B29/00—Guards or sheaths or guides for hand cutting tools; Arrangements for guiding hand cutting tools
    • B26B29/06—Arrangements for guiding hand cutting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/08—Making a superficial cut in the surface of the work without removal of material, e.g. scoring, incising

Definitions

  • the present invention relates to a device, according to the preamble of Claim 1 , by means of which plasterboard or similar board can be cut, particularly board that is surfaced with paper on both sides.
  • boards for example plasterboard, surfaced with paper are widely used. Because the plaster is brittle, the boards are surfaced on both sides with kraft paper. When constructing walls, ceilings, and nowadays also floors, the boards often have to be cut to a smaller size.
  • the cutting takes place on site using a carpet knife and a plank, or some other straight guide, or a device designed for the purpose, such as that disclosed, for example, in US patent 5732472. All of these cutting methods have the common feature that the paper is cut only on one side, after which the board is bent, so that it breaks. After this, the paper on the other side often has to be cut. This increases the work time. Another drawback is the crumbling of the surface of the break. This increases the amount of work needed to finish the wall smoothly.
  • the present invention is intended to create a solution, by means of which cutting can be carried out rapidly and cleanly and which tool is, in addition, economical to manufacture and economical to use.
  • the present invention is based on an entirely new type of solution, which eliminates the drawbacks referred to above.
  • plasterboard can be cut simultaneously on both sides, giving a clean cut and saving work time.
  • 'carpet-knife' blades which have sections that can be broken off. A section is broken off once the blade becomes blunt. Because the blade is set at an angle relative to the paper, the fibres are cut by slicing. This reduces the force required for cutting.
  • the product is designed in such a way that its components can be manufactured automatically using mass-production methods.
  • the components of the product are also designed in such a way that the end user, i.e. the customer, assembles the product themselves, thus saving assembly costs.
  • Figure 1 shows a side view of the device according to the invention
  • Figure 2 shows a top view of the device of Figure 1 ;
  • Figure 3 shows a cross section A - A of Figure 1 ;
  • Figure 4 shows a cross section B - B of Figure 2.
  • a recess or slot 9 is arranged, the cross-section of which shows that steps are formed in the bottom of the slot, to receive the edges of boards of several different thicknesses. Plasterboard 11 of all the different thicknesses on the market will fit into this slot. Each groove formed by the slot is slightly wider than the corresponding standard sheet of plasterboard.
  • the stepping can be replaced with a slot designed for only a single thickness of board. In that case, because the device is cheap, each board thickness can have its own cutter. However, it is also obvious that it is possible to use a cutter, with a slot adapted to accept a thicker board for cutting, to cut a thinner board. In that case, the slight looseness appearing in the bottom of the slot will scarcely disturb the cutting.
  • Another alternative is to make the width of the slot adjustable.
  • the adjustability can easily be arranged by using a suitable screw adjustment or similar.
  • the sides of the slot will then move closer to/away from each other either on separate guides, or else by the adjustment screws acting also as guides.
  • This kind of adjustment can also take place conventionally using various spacer pieces or washers.
  • slots 8 On both sides of the frame, there are also, essentially symmetrically arranged slots 8, which are particularly set at an angle to the slot 9.
  • the angle between the slot 9 or the upper surface of the frame 1 and the slot 8 can vary widely and is usually between 15 and 45 degrees.
  • the slot 8 has a guide 2 fitted it, at the end of which there are cutting blades 3, arranged so that they cut the board set in the slot 9 on both sides.
  • the blades are set essentially parallel to the direction of travel of the device.
  • the cutting blades 3 cut the paper of the board from both sides, so that the cut piece detaches easily and cleanly, for example, when the board is tapped or bent against the edge of a work surface.
  • One problem in the cutting methods according to the state of the art has been precisely the formation of an untidy cut surface.
  • the blades are at an angle C, which can preferably vary between 5 and 45 degrees. It is obvious that, in terms of the force required for cutting, roughly the position of the blades 3 shown in Figure 2 is preferable, in which case the points of the blades cut at a small angle.
  • the guide 2 fits into the slot 8.
  • Grooves 12, as well as securing screws 6 for the two cutting blades 3, are arranged in an extension 13 at the end of the guide 2.
  • the position of the blade 3 can be altered linearly, the use of a conventional carpet knife blade being easy and simple in this connection, as the blunted end section of the blade can easily be broken off, after which the blade can again be secured in its position by tightening the screw 6.
  • the guide 2 is set to the desired cutting depth with the aid of a scale 7. Because the grooves in the slot 9 are at different depths relative to the guide 2, there are as many scales as there are grooves. These scales are marked with the corresponding board thickness, so that the user will know which scale to use. In the groove 10, locking takes place with the aid of the guide and of a securing screw 5. The cutting width can then be set steplessly, within the limits set by the length of the groove.
  • the cutting depth of the blades can be set using the securing screws 6. If necessary, a locking piece 6' can be used beneath the screws.
  • the device is placed at the edge of the board to be cut, with the edge of the board 11 resting on the bottom of the groove of the slot 9 corresponding to its thickness and cutting is carried out by pushing the frame component along the board for the desired cutting length, in the direction shown by the arrow in Figure 1.
  • the desired piece will then be detached from the board in a single pass.
  • the product is manufactured, for example, as follows.
  • the frame component 1 is made by means of a mass-production method, for example, by injection- moulding high-strength plastic.
  • the frame 1 can be made from two parts, made with a single simple mould, which are fitted together using screws 4. Manufacture can also take place without screw attachment, using a single part, but this will require a more complex and expensive mould.
  • the guide 2 can be manufactured using a simple mould of two, mirror-image parts to be fitted together.
  • the scale 7 can be arranged in the mould, so that it will be always copied onto the product, at no separate cost.
  • the cutting blades can be, as stated above, the so-called carpet-knife blades widely available on the market, which, when they become blunt, can have the end section broken off to bring a new and sharp section into the working position for cutting.
  • the product disclosed above can be delivered to the end user as a set of parts, thus saving packing space and assembly costs.
  • the device according to the invention is particularly suitable for cutting paper-surfaced plasterboard, such board breaking very cleanly when the surfacing paper is cut on both sides, it is self-evident, that the device according to the invention can also be used to cut other kinds of board than the aforesaid plasterboard. Even if there is no paper on the surface of the board, making a cut on both sides of the board will be sufficient to break the board cleanly along the cuts, even in the case of other types of board.

Abstract

A device for cutting board, by cutting the surface of the board, which includes a frame (1) and a cutting blade (3), which has a groove or slot (9) in the frame for the edge of the board (11), and adjustable guides (2) for adjusting the distance from the edge of the board of blades (3) set to cut the board from both sides. There are two guides (2), one frame (1) and, on both sides of the board (11) and at the ends of the guides (2), there are also protrusions (13) to attach the blades (3) to. The slot (9) has a cross-section that, for example, narrows in steps, to receive the edges of boards of different thicknesses at different depths.

Description

Device for Cutting Board
The present invention relates to a device, according to the preamble of Claim 1 , by means of which plasterboard or similar board can be cut, particularly board that is surfaced with paper on both sides.
In building construction, boards, for example plasterboard, surfaced with paper are widely used. Because the plaster is brittle, the boards are surfaced on both sides with kraft paper. When constructing walls, ceilings, and nowadays also floors, the boards often have to be cut to a smaller size. The cutting takes place on site using a carpet knife and a plank, or some other straight guide, or a device designed for the purpose, such as that disclosed, for example, in US patent 5732472. All of these cutting methods have the common feature that the paper is cut only on one side, after which the board is bent, so that it breaks. After this, the paper on the other side often has to be cut. This increases the work time. Another drawback is the crumbling of the surface of the break. This increases the amount of work needed to finish the wall smoothly.
There is a cutter model on the market, which cuts the paper on both sides. This model employs rotating grooved blades. This model has the problem that the paper is cut by pressure, so that the blades must be extremely sharp. The blades rapidly become blunt and expensive special blades must be purchased.
The present invention is intended to create a solution, by means of which cutting can be carried out rapidly and cleanly and which tool is, in addition, economical to manufacture and economical to use.
The aforementioned and other advantages and benefits of the present invention are achieved in the manner stated as characteristic in the accompanying claims.
In brief it can be stated that the present invention is based on an entirely new type of solution, which eliminates the drawbacks referred to above. By means of the solution according to the invention, plasterboard can be cut simultaneously on both sides, giving a clean cut and saving work time. It is possible to use economical standardized so-called 'carpet-knife' blades, which have sections that can be broken off. A section is broken off once the blade becomes blunt. Because the blade is set at an angle relative to the paper, the fibres are cut by slicing. This reduces the force required for cutting.
The product is designed in such a way that its components can be manufactured automatically using mass-production methods. The components of the product are also designed in such a way that the end user, i.e. the customer, assembles the product themselves, thus saving assembly costs.
In the following, the invention is examined in greater detail with reference to the accompanying schematic drawings, without being in any way restricted to them.
Thus:
Figure 1 shows a side view of the device according to the invention;
Figure 2 shows a top view of the device of Figure 1 ;
Figure 3 shows a cross section A - A of Figure 1 ; and
Figure 4 shows a cross section B - B of Figure 2.
In the following, reference is made simultaneously to all the figures, in order to explain the operation of the invention.
In the frame 1 of the product, a recess or slot 9 is arranged, the cross-section of which shows that steps are formed in the bottom of the slot, to receive the edges of boards of several different thicknesses. Plasterboard 11 of all the different thicknesses on the market will fit into this slot. Each groove formed by the slot is slightly wider than the corresponding standard sheet of plasterboard.
It is obvious that the stepping can be replaced with a slot designed for only a single thickness of board. In that case, because the device is cheap, each board thickness can have its own cutter. However, it is also obvious that it is possible to use a cutter, with a slot adapted to accept a thicker board for cutting, to cut a thinner board. In that case, the slight looseness appearing in the bottom of the slot will scarcely disturb the cutting.
Another alternative is to make the width of the slot adjustable. The adjustability can easily be arranged by using a suitable screw adjustment or similar. The sides of the slot will then move closer to/away from each other either on separate guides, or else by the adjustment screws acting also as guides. This kind of adjustment can also take place conventionally using various spacer pieces or washers.
On both sides of the frame, there are also, essentially symmetrically arranged slots 8, which are particularly set at an angle to the slot 9. The angle between the slot 9 or the upper surface of the frame 1 and the slot 8 can vary widely and is usually between 15 and 45 degrees. The slot 8 has a guide 2 fitted it, at the end of which there are cutting blades 3, arranged so that they cut the board set in the slot 9 on both sides. The blades are set essentially parallel to the direction of travel of the device. Particularly in the case of paper-surfaced plasterboard, the cutting blades 3 cut the paper of the board from both sides, so that the cut piece detaches easily and cleanly, for example, when the board is tapped or bent against the edge of a work surface. One problem in the cutting methods according to the state of the art has been precisely the formation of an untidy cut surface.
Relative to the slot 9, the blades are at an angle C, which can preferably vary between 5 and 45 degrees. It is obvious that, in terms of the force required for cutting, roughly the position of the blades 3 shown in Figure 2 is preferable, in which case the points of the blades cut at a small angle.
The guide 2 fits into the slot 8. Grooves 12, as well as securing screws 6 for the two cutting blades 3, are arranged in an extension 13 at the end of the guide 2. By loosening the screws 6, the position of the blade 3 can be altered linearly, the use of a conventional carpet knife blade being easy and simple in this connection, as the blunted end section of the blade can easily be broken off, after which the blade can again be secured in its position by tightening the screw 6.
The guide 2 is set to the desired cutting depth with the aid of a scale 7. Because the grooves in the slot 9 are at different depths relative to the guide 2, there are as many scales as there are grooves. These scales are marked with the corresponding board thickness, so that the user will know which scale to use. In the groove 10, locking takes place with the aid of the guide and of a securing screw 5. The cutting width can then be set steplessly, within the limits set by the length of the groove.
The cutting depth of the blades can be set using the securing screws 6. If necessary, a locking piece 6' can be used beneath the screws.
Once the guide 2 has been set to the desired depth, the device is placed at the edge of the board to be cut, with the edge of the board 11 resting on the bottom of the groove of the slot 9 corresponding to its thickness and cutting is carried out by pushing the frame component along the board for the desired cutting length, in the direction shown by the arrow in Figure 1. The desired piece will then be detached from the board in a single pass.
The product is manufactured, for example, as follows. The frame component 1 is made by means of a mass-production method, for example, by injection- moulding high-strength plastic. The frame 1 can be made from two parts, made with a single simple mould, which are fitted together using screws 4. Manufacture can also take place without screw attachment, using a single part, but this will require a more complex and expensive mould.
Correspondingly, the guide 2 can be manufactured using a simple mould of two, mirror-image parts to be fitted together.
If necessary, the scale 7 can be arranged in the mould, so that it will be always copied onto the product, at no separate cost.
The cutting blades can be, as stated above, the so-called carpet-knife blades widely available on the market, which, when they become blunt, can have the end section broken off to bring a new and sharp section into the working position for cutting.
The product disclosed above can be delivered to the end user as a set of parts, thus saving packing space and assembly costs.
Only two production moulds are required to manufacture the main components. The other parts required are standard components readily available on the market. This means that the device is also economical to manufacture.
Even though the device according to the invention is particularly suitable for cutting paper-surfaced plasterboard, such board breaking very cleanly when the surfacing paper is cut on both sides, it is self-evident, that the device according to the invention can also be used to cut other kinds of board than the aforesaid plasterboard. Even if there is no paper on the surface of the board, making a cut on both sides of the board will be sufficient to break the board cleanly along the cuts, even in the case of other types of board.

Claims

Claims
1. A device for cutting board, by making a cut in the surface of the board, which includes a frame (1 ) and a cutting blade (3), which has a groove or slot (9) in the frame for the edge of the board (11 ), and adjustable guides (2) for adjusting the distance from the edge of the board of blades (3) set to cut the board from both sides, characterized in that the blades are formed by the blades (3) attached in an adjustable manner to the guides and which cut by cutting with their trailing edge relative to the direction of movement.
2. A device according to Claim 1 , characterized in that the blades (3) are conventional blades with sections that can be broken off.
3. A device according to Claim 1 , characterized in that there are protrusions (13) at the ends of the guides (2) to which the blades (3) are attached.
4. A device according to Claim 3, characterized in that the protrusions (13) include grooves (12) for the blades (3) and screws (6) for locking the blades in place.
5. A device according to Claim 1 , characterized in that the slot (9) has a cross- section that narrows in steps, to receive boards of different thickness at different depths.
6. A device according to Claim 1 , characterized in that the slot (9) width is adjustable.
7. A device according to Claim 1 , characterized in that the guides (2) are attached to grooves in the frame (1 ), and that they form an angle with the edge of the bottom of the slot (9)/the board (11 ).
8. A device according to any of the above Claims, characterized in that there are slots (10) in the guides (2) and that their adjustment and locking is intended to take place by means of locking screws (5) that run through the slots.
9. The use of a device according to any of the above Claims for working particularly with boards, such as plasterboard, surfaced of both sides with paper or other material that can be cut.
PCT/FI2003/000048 2002-01-24 2003-01-21 Device for cutting board WO2003061919A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20020129 2002-01-24
FI20020129A FI20020129A (en) 2002-01-24 2002-01-24 Device for cutting building boards

Publications (1)

Publication Number Publication Date
WO2003061919A1 true WO2003061919A1 (en) 2003-07-31

Family

ID=8562895

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2003/000048 WO2003061919A1 (en) 2002-01-24 2003-01-21 Device for cutting board

Country Status (2)

Country Link
FI (1) FI20020129A (en)
WO (1) WO2003061919A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2529210A (en) * 1947-05-23 1950-11-07 Joseph F Butler Cutting apparatus for wallboards and the like
US5488773A (en) * 1995-02-10 1996-02-06 Fletcher; Donald C. Material scoring apparatus
US5600892A (en) * 1995-06-01 1997-02-11 Peugh; Glenn H. Dual side drywall panel cutter
US5659961A (en) * 1992-04-16 1997-08-26 Gyproc Group Ab Cutting tool to perform cutting operations on board material
JPH1058379A (en) * 1996-08-19 1998-03-03 Apatsukusu:Kk Cutting device for plastic corrugated cardboard

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2529210A (en) * 1947-05-23 1950-11-07 Joseph F Butler Cutting apparatus for wallboards and the like
US5659961A (en) * 1992-04-16 1997-08-26 Gyproc Group Ab Cutting tool to perform cutting operations on board material
US5488773A (en) * 1995-02-10 1996-02-06 Fletcher; Donald C. Material scoring apparatus
US5600892A (en) * 1995-06-01 1997-02-11 Peugh; Glenn H. Dual side drywall panel cutter
JPH1058379A (en) * 1996-08-19 1998-03-03 Apatsukusu:Kk Cutting device for plastic corrugated cardboard

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 8 30 June 1998 (1998-06-30) *

Also Published As

Publication number Publication date
FI20020129A (en) 2003-07-25
FI20020129A0 (en) 2002-01-24

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