WO2013141794A1

WO2013141794A1 - Portable cutting tool

Info

Publication number: WO2013141794A1
Application number: PCT/SE2013/050291
Authority: WO
Inventors: Jörgen LIND
Original assignee: Winklipp Ab
Priority date: 2012-03-20
Filing date: 2013-03-18
Publication date: 2013-09-26
Also published as: SE1250266A1; SE536424C2

Abstract

The present invention relates to a portable cutting tool (10) for the cutting off of lists (100) or the like, comprising a cutter (1), which is rotatably mounted on a shaft (71), a cutting table (2) for the reception of a list (100), a cover (70) with a handle (80), a motor (6) for the operation of the cutter (1) towards the cutting table (2) via a gear device (3), and an adjustable stop (5) forming a longitudinal contact surface (55) substantially at right angles to a main extension surface for the cutting table (2). The stop (5) is adjustable so that it can be arranged at least at two different angles in relation to a plane, in which the cutter (1) moves during a cutting operation, so that, when a list to be cut off bears against the stop (5) on the cutting table (2), depending on the positioning of the stop (5), this can be cut in one of at least two different angles.

Description

Title:

PORTABLE CUTTING TOOL

TECHNICAL FIELD

The present invention relates to a portable cutting tool comprising a cutter, which is rotatably mounted on a shaft and which can be used to cut off lists or the like.

STATE OF THE ART

The cutting of lists is problematic in various ways. Lists are often long, relatively narrow or thin in comparison with other wood or the like, and they have to be cut at different angles depending on where and how they are to be used, such as skirting-boards, cornices, picture frames, mouldings, wall strips, etc. Freguently, it is necessary to exchange lists or mount them in housing accommodations, in which people might live, or which are nearly finished. As lists, by means of the technique used today, are sawn, this means that a considerable littering occurs, and one tries to avoid this in rooms where people live, which in its turn means that one has to bring lists out and in, maybe up and down stairs etc., and such lists may be long and run the risk of being broken, and they are uncomfortable to carry. Furthermore, as many lists may be reguired for example in a room, it means that it might be necessary to bring lists out and in many times. Furthermore, there is a considerable risk of splintering when lists are sawn.

For picture frames and tile lists there are today hand tools, which are essentially based on that the list in question is cut off. However, such hand tools only work for very narrow and thin lists of the kind mentioned above and not for common lists, which are used for construction work, simply because the power, which would be necessary to cut off a list by means of such a tool, is too large. The tool is too weak, reguires too big manual power and would break without having been able to accomplish the desirable cutting.

DESCRIPTION OF THE INVENTION

Therefore, it is an object of the present invention to provide a portable cutting tool for cutting off lists or the like, which is easy to handle and transport and which works for most types, shapes and sizes of lists used for construction work, for example in housing accommodations, offices, shops etc. A special object of the invention is to provide a portable cutting tool, which is flexible and can be adapted to various types of lists and to the spaces, in which it is to be used, respectively, and make cutting possible, so that the lists fit in various places. It is also an object of the invention to provide a cutting tool, which substantially facilitates the work when cutting of lists, for example in spaces where people live or which are used, without causing littering. It is also an object to provide a cutting tool, by means of which lists can be cut off at a very small risk of splintering or other damage to the list. It is also a particular object of the invention to provide a portable cutting tool, which is easy and cheap to manufacture, easy, guick and smooth to use, and which does not reguire any addi- tional eguipment .

Therefore, a portable cutting tool is provided, which exhibits the characteristics indicated in patent claim 1. Advantageous embodiments and different variants of the tool are stated in the characteristics indicated in the dependent claims. SHORT DESCRIPTION OF THE FIGURES

In the following the invention will be described more in detail, with a non-limiting purpose, and with reference to the accompanying drawings, in which: Fig. 1 illustrates a cutting tool according to a first embodiment in an open position prepared for cutting, with a stop located in a first position,

Fig. 2 illustrates a cutting device according to Fig. 1 with the cutter in a down-rotated position, bearing against cutting table, and with the stop in the same position as in Fig. 1,

Fig. 3 illustrates a cutting device according to Fig. 1 with a stop positioned at another angle, whereby the cutter is in an up-rotated position prepared for cutting and a list is provided in a position to be cut off, illustrates a cutting device according to Fig. 1 with a stop in a third alternative position, illustrates the cutting device according to

Fig. 2 with removed cover, is a front view of the cutting device according to Fig. 1, Fig. 7 is a lateral view of the cutting device with cutter in inactive, down-rotated position according to Fig. 2 and with removed cover, Fig. 8 illustrates the cutting tool as in Fig. 6, but with the cutter in up-rotated position,

Fig. 9 illustrates the cutting tool according to Fig. 7 seen from above,

Fig. 10 is a lateral view of an alternative second

embodiment of a cutting tool, and

Fig. 11 illustrates a cutting device according to an

alternative, third embodiment with a cable for power supply.

DETAILED DESCRIPTION

Figure 1 illustrates a first embodiment of a cutting tool 10 with a cutter 1, the mounting and geared driving by means of a motor is not shown in the figure, since these devices are accommodated in an outer cover 70. The outer cover 70 is provided with a handle 80. In this embodiment the motor (not shown) is supposed to be driven by a battery accommodated in a battery housing 60, which is mounted at the outer cover 70. The cutter 1 is in figure 1 arranged in a position prepared for cutting, where it is up-rotated, i.e. the cutting tool is in a state, in which it can receive a list to be cut off. The cutting tool also comprises a cutting table 2, which is adapted to receive a list to be cut off by the cutter 1. A stop 5 is adapted to form a list contact surface 55, which is substantially perpendicular to the extension surface 25 of the cutting table 2, so that during a cutting operation the list will bear substantially flat on the cutting table and in contact with the stop 5. In the illustrated example the stop 5 is locked in a first position, in which the list is intended to be cut off at an angle of 90° in relation to its length extension. The stop 5 is secured in this position and is preferably adjustable to allow it to be arranged and secured in order to form different angles with the plane formed by the cutter during a cutting operation, which is achieved through co-operation with angle adjusting means 22χ, 22₂, 22₃, which here consist of holes or recesses in the cutting table 2. The stop 5 is provided with a slot or a recess 51 in order to allow passage of a rear portion of the cutter 1 during a cutting operation. The stop may be designed in many ways and it is also possible to use a stop consisting of two portions, which, however, must be connected in some way if angle adjusting means are to be provided, as is illustrated in figure 1. Alternatively, two sets of angle adjusting means (not shown) are required at a stop consisting of two portions, which are not connected. The cutting table 2 is provided with a longitudinal slot or recess 21 in a position corresponding to the position, in which the cutter or an edge or a cutting surface of the cutter will be approaching and finally received during the completion of a cutting operation. The slot or the recess consists of, or is provided with, a strip of plastic or hard rubber, against which the cutter goes, in order to reduce wear of the edge of the cutter and the cutting table. In order to further reduce the risk of splintering and in order to facilitate the cutting operation, the cutting table is inclined downwards, outwards away from the recess 21 (not shown in this figure, reference is made to figure 6) .

Figure 2 illustrates the cutting device according to figure 1 with the cutter 1 in down-rotated or lowered position, for example when a cutting of a list (not shown) has been completed or in secured position. The figure illustrates how the edge of the cutter or the cutting surface is received in the slot 21. Figure 2 also shows a control unit 53 for angle adjusting means 52 provided on the stop 5. The function thereof is more clearly illustrated in figure 3 and is based on the gripping of the control unit 53 and the lifting up of the angle adjusting means 52, for example through spring action (not shown) . The angle adjusting means 52 can consist of a pin or the like, see figure 3, which in lifted up position makes it possible to move the stop and bring it into various angular positions. In the desired angular position the pin or the like is placed above the adjustment means of the cutting table, and through the action of a spring or the like the pin is brought down into a suitable hole, where it is secured either through the action of a spring or another locking means . Figure 3 illustrates the cutting tool 10 according to figures 1 and 2, but where the stop 5 is adjusted at another cutting angle, in that the pin 52 is introduced, for example in hole 22χ, which in the figure is hidden by a schematically illustrated list 100, which is in cutting position, and the cutter is in a position prepared for cutting (raised position) . Figure 4 illustrates again the cutting tool 10 with the cutter 1 in open, raised, position ready for a cutting operation. Here the stop 5 is adjusted to form another angle and the pin (not shown here) is introduced into a hole in the cutting table (not visible) , for example corresponding to the position shown in figure 9 (22_i) .

Figure 5 illustrates the cutting tool 10 with removed cover 70, for example lifted off. The cover 70 with or without battery housing 60 may be connected, fixedly or removably, to the cutting table 2, etc. in different ways, by means of screws, snap-on elements, bolts or other suitable means. The battery housing 60 is designed to accommodate a battery 61, and it may be attached to the cover 70 in various ways. Alternatively, the battery housing can be included in the cover 70, also called the outer cover, and consist of a lid or a shutter to protect the battery. Before a cutting operation the cutter 1 is in up-rotated position partly received in a slot 76 in a front portion of the cover 70, so that motor, gear wheel and so on are covered as good as possible to protect against penetrating dirt, moisture and to reduce risk of damage. In figure 5 the motor 6 is shown, which is

supposed to include the gear device, generally bearing the reference numeral 3, normally a reduction gear, gear wheel 63, which via link arm 73, which is rotatably mounted via a shaft 72 at, here, the rear, upper portion of the cutter 1, or more specific a cutter holding device 11, which at its lower, rear end, opposite the point of the cutter 1, is pivotably mounted on shaft 71, parallel to the extension or contact surface of the cutting table. Figure 6 is a front view of the cutting tool 10. In the figure the motor 6, the gear wheel 63, the stop 5 are arranged as before a cutting operation at right angles with the pin 52 inserted by means of the control unit 53 in hole 22₀ in the cutting table 2. In the figure the inclination of the cutting table outwards from the recess or slot 21 to both sides is shown. Especially, the inclination of the cutting table coincides with, or somewhat exceeds, the wedge-shape of the cutter blade. In one embodiment the angle of the wedge-shape of the cutter edge is about 4° - 5°, and the inclination of the table, which is here shown with an angle β, may for example be between 2° - 2,5° (on each side of the cutter) . In figure 6 β is illustrated as the angle between a horizontal plane and the inclination of the cutting table towards the respective outer edges. In this case the horizontal plane is formed of the lower side of the stop 5, which, of course, must not be completely horizontal. Of course, the indication of the angles are not meant to constitute any limi- tation, but may be varied and be somewhat smaller or somewhat larger, the wedge-shape of the cutter edge as well as the inclination of the table, which for example may be between 1° - 6° or smaller/larger. Figures 7 and 8, respectively, illustrate the cutting tool 10 with the cover removed. In figure 7 the cutting tool 10 is shown with the cutter 1 in down-rotated position from the side. The stop 5 is arranged in a first angular position corresponding to 90° in relation to the cutter 1 and is locked in this position via the pin 52 and the control unit 53. The stop 5 is here supposed to consist of a stop formed in one piece and with a recess (not shown) for accommodation of the rear end of the cutter 1 in down- rotated position, and is formed of a stop base element 56. Here the motor 6 comprises a gear device and drives via gear wheel 63 the cutter 1. A link arm 73 is at one of its ends via a shaft 74 (figure 8) connected to the gear wheel 63 and at its other end through shaft 72 connected to the rear end of the cutter or an upper end of a cutter

mounting device. When the gear wheel 63 rotates, the cutter 1 will be rotated, pivoted, round shaft 71, on which it is mounted at the cutting table (or in connection thereto) between down-rotated (figure 7) and up-rotated

(figure 8) position. The gear device gears down the rotary freguency of the motor, for example from 5000 revolutions per minute to 2 revolutions per minute, which, however, shall be seen only as exemplifying indications. In figure 7 and 8, respectively, the contact surface 25 of the cutting table 2 is illustrated, which is somewhat inclined outwards, as described previously.

Figure 9 is a view from above of the cutting tool 10. The cutter 1 is in down-rotated position and the stop 5 is provided in a position at right angles to the cutter. The two parts 5, 5 of the stop form a continuous unit or is kept together by means of stop base element 56 below the rear portion of the cutter 1. The control unit 53 covers angle adjusting means 22₀ in the cutting table 2. In figure 9 angle adjusting means 22_i is also illustrated. Of course, the number of holes in the cutting table may vary, it may be more or fewer. They may also be arranged in any other way or in other positions. The stop 5 may also be designed in other ways, for example it may be made in two pieces (not kept together) , which would imply two sets of angle adjusting means at both sides of the table. Of course, there are many other alternative ways to fix the stop at the desired angle within the scope of the present invention.

Figure 10 illustrates an alternative embodiment of a cutting tool 20 comprising a cutter IB, cutting table 2B, outer cover 70B, which here comprises a handle 81B between a portion 60B of the cover 70B which encloses the motor 6B and a battery in an associated battery housing portion 60B, and a portion 80B, which encloses the gear device 3B with gear wheel, link arm 73B, which here is mounted, 72B, at the rear, upper end of the cutter, so that this can be brought to rotate around bearing shaft 71B connected to, our included in, the cutting table. The stop 5B is in figure 10 positioned at right angles to the longitudinal direction of the cutter, which is shown schematically.

Even if the cutting tool 20 in this embodiment comprises a motor which is battery operated, it should be understood that the motor as an alternative may, via a cable, be connected to the power supply network, as is illustrated in figure 11, which shows a third embodiment of a cutting tool 30, where the motor is adapted to be electrically operated via a cable 17 with a plug 18.

The cutting tool 30 (illustrated with removed cover) is similar to the cutting tool 10 with an outer cover 70C with a handle 81C provided thereon, which in this embodiment instead is arranged at right angles to the cutter 1. The cutting table 2C substantially corresponds to the cutting table 2 as it is described with reference to the figures 1-9 with angle adjusting means 22i, 22₂, 22₃, in which a pin (not shown) connected to control unit 53 can be secured in said angle adjusting means (here hole 22₀) . The elements corresponding to the elements described with reference to previous figures are provided with the same reference numerals, but with index C.

The invention may be varied in a number of ways within the scope of the invention and is only to be limited of the accompanying patent claims. Especially, the table can have many different shapes, as can the cutter. Also the stop can have another shape and be arranged in different ways and various types of angle adjusting means can be used. Of course, also the outer cover with grip or handle can be designed in many different ways, the essential is that it is a motor driven portable hand tool, by means of which lists can be cut off at the desired angle without the forming of splinters, chips etc. An advantage of the cutting tool is that it is easy to handle, easy to carry, that cutting may be effected rapidly and easily without littering, and can be effected wherever a cutting operation is reguired, independently if the spaces, where cutting is to be effected, are narrow, furnished and normally used. In an advantageous embodiment the tool comprises cable connection as well as possibility of operating the motor by means of battery. Also in other aspects the invention may be varied in a number of

different ways.

Claims

PATENT CLAIMS

1. Portable cutting tool (10;20;30) for the cutting off of lists (100) or the like, comprising a cutter

(1;1B;1C), which is rotatably mounted on a shaft

(71; 7 IB; 71C) ,

c h a r a c t e r i z e d i n

that it comprises a cutting table (2;2B;2C) for the reception of a list (100) or the like, which is to be cut off, a cover (70) with a handle (80; 81B; 81C) or a grip area, a motor (6;6B;6C) for the operation of the cutter (1;1B;1C) via a gear device (3;3B;3C) to allow geared driving of the cutter (1;1B;1C) towards the cutting table, and an adjustable stop (5;5B;5C), which is provided with angle adjust- ing means (52) and arranged to form a longitudinal contact surface (55) substantially perpendicular to a main extension surface for the cutting table (2;2B;2C), where said stop (5;5B;5C) is adjustable by means of said angle adjusting means (52) so that it can form at least two different angles in relation to a plane, in which the cutter (1;1B;1C) moves during a cutting operation, so that when a list or the like, which is to be cut off, is arranged to bear against the stop (5;5B;5C) on the cutting table (2;2B;2C), the list or the like, depending on said positioning of the stop (5;5B;5C), can be cut off in one of at least two different angles.

2. Portable cutting tool according to Claim 1, c h a r a c t e r i z e d i n

that it comprises a cover (70;70B) with a space (60;60B), separate or in connection with said cover, for receiving a battery (61), and that the motor (6;6B) is battery

operated .

3. Portable cutting tool (30) according to Claim 1, c h a r a c t e r i z e d i n

that it comprises a cover (70) and that the motor (6C) is arranged to be connected to a power supply network via a cable (17) with plug (18) .

4. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the stop (5;5B;5C) has a length, which is at least somewhat shorter than the length and width dimensions of the extension surface of the cutting table (2;2B;2C), and that the stop (5;5B;5C) is provided with a recess, a slot (51), or that it consists of two portions in order to allow the passage of the cutter (1;1B;1C) during cutting movement towards the cutting table (2;2B;2C).

5. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the cutting table (2;2B;2C) has a longitudinal slot or recess (21) in a position corresponding to the position, in which the cutter or an edge or cutting surface (11) of the cutter is during cutting operation or in a down-rotated position.

6. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the angle adjusting means comprise a pin (52) or the like, which is connected to a control unit (53), that the cutting table (2;2B;2C) is provided with adjustment means (22₀, 22i, 22₂, 22₃, ... ; 22χ, ... ) adapted to co-operate with the angle adjusting means (52) of the stop.

7. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the stop (5;5B;5C) is adjustable in more than two predetermined angular positions.

8. Portable cutting tool according to Claim 6 and 7, c h a r a c t e r i z e d i n

that the adjustment means (22₀, 22i, 22₂, 22₃, ... ; 22_if ... ) of the cutting table consist of holes, that for locking of the stop (5;5B;5C) in an angular position, its angle adjusting means (52), comprising a pin or the like, which is movable substantially perpendicularly to the cutting table, is controlled by the control unit (53) in such a way that the pin or the like, substantially perpendicular to the main extension surface (25) of the cutting table, is brought down into the selected hole, and, for example through spring action, is secured or locked in the position in which it is inserted in the hole during a cutting operation .

9. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the cutter (1;1B;1C) has a cutting length of about 70-120 cm, preferably between 80-95 cm.

10. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the cutter (1;1B;1C) has an exchangeable blade.

11. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the cutting table (2;2B;2C) has an upper contact surface substantially corresponding to said main extension surface (25), that this upper contact surface is inclined at an angle (β) in order to have a symmetrical inclination, somewhat downwards, outwards around and away from the slot (21) or the recess in both directions therefrom towards outer edges or sides of the cutting table

(2;2B;2C) .

12. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that the gear device (3;3B;3C) comprises a reduction gear (3;3B;3C) provided in the motor (6;6B;6C), or connected thereto, which is arranged, via a link arm (73; 73B; 73C) , which in one end is connected ( 72 ; 72B; 72C ) to a rear end of the cutter (1;1B;1C), to transfer a rotary movement of the motor via a gear wheel (63;63C) into a linear movement of the cutter, which at the opposite side of the rear end is rotatably mounted on a shaft ( 71 ; 7 IB; 71C ) , and which via the link arm (73;73B;73C) is caused to rotate round the shaft (71; 71B; 71C) and perform a cutting movement directed towards the cutting table (2;2B;2C) .

13. Portable cutting tool according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that it comprises an outer cover (80) provided with a handle (81) and designed to enclose at least the electric motor (6) with gear device, gear wheel (3), link arm (73)

14. Portable cutting tool (20) according to anyone of the preceding Claims,

c h a r a c t e r i z e d i n

that handle (81B) is provided between a portion (60B) of the outer cover (70B) which encloses the motor and a battery housing (61B) and/or a cable connection for a cable with plug, and a gear cover (80B) including the gear device ( 3B) .