DE29717912U1 - Cutting device - Google Patents

Description

Busse & Busse Patent Attorneys

European Patent and Trademark Attorneys INOTEC Maschinenbau GmbH

Luisenweg 2 Dipl.-Ing. Dr. iur. V. Busse

49838 Wettrup Dipl.-Ing. Dietrich Busse

Dipl.-Ing. Egon Bünemann Dipl.-Ing. Ulrich Pott

Wholesale Ring 6

D-49084 Osnabruck

PO Box 1226

D-49002 Osnabruck

Telephone:0541-586081 Fax:0541-588164

08.10.1997 DB/HB/Le-297122

Cutting device

The invention relates to a cutting device for cutting insulating panels or similar panel bodies according to the preamble of claim 1.

DE 4 435 252 A 1 discloses a cutting device of this type in which a cutting wire is held in a U-shaped bracket and therefore a pressure force perpendicular to the extension of the cutting wire must be exerted on the bracket in order to cut through an insulation board. To ensure that the pressure bracket running parallel to the cutting wire does not penetrate the insulation board, the distance between the cutting wire and the pressure bracket must be at least as large as the thickness of the board. In addition, since in the starting position the space between a base plate and the cutting wire must also leave the thickness of the board to be cut free, such a device is bulky. In addition, in order to prevent the bracket from tilting, the pressure must be applied approximately in the middle of the pressure bracket, which can cause problems with a wide board, especially when arranged horizontally, since the operator then has to bend very far over the device.

With such a device, it is not possible to cut out recessed corner areas from the insulation panels without additional equipment; instead, these are always cut across their entire width.

Setting an exact angle for a miter cut is difficult because the cutting bracket is mounted on hinges but must be fixed in an unreadable angular position on a straight guide rail.

The invention is based on the problem of improving a cutting device of the type mentioned at the outset with regard to its handling.

The invention solves this problem with a cutting device having the features of claim 1 and claim 9 as well as claim 13.

The inventive design of a drive element provided to the side of the plate body to be cut, which causes the parallel movement of the separating element required for cutting the plates, means that a bracket for moving the cutting element is not required. The dimensions of such a device can therefore be reduced considerably.

If the cutting device is arranged horizontally, it can, for example, be hung on an external railing of a scaffold. The user then does not need to bend outwards over the railing to exert a pressure force in the middle of a bracket, but can safely carry out the cutting process using the lateral drive element facing him. Restrictions on the width of the scaffold are avoided with such an arrangement.

If the drive element is a chain drive that is manually operated, it is possible to manufacture such a device cheaply and its reliable operation is guaranteed even after long periods of use on the construction site. The drive element can also be driven by a motor drive, possibly located elsewhere.

If a guide slot is advantageously designed parallel to a straight section of the chain drive for the separating element and this guide slot is electrically conductive, the separating element, in particular a cutting wire, can be supplied with an electrical voltage via the guide slot, so that heating can take place without moving parts.

It goes without saying that such a device can be used in a horizontal, inclined or vertical position.

Cutting out corners from insulation boards, as is necessary for example on window lintels, is made possible with a cutting device according to the invention independently of lateral drive elements by a guide rail running parallel to the board plane for holding a cutting element that is essentially perpendicular to the board plane. On this guide rail, the cutting element cutting the board plane can be pulled through the insulation board in one direction and then swiveled by 90 degrees, for example, so that the corner is completely cut out by moving the insulation board sideways. Any kind of bevel cuts are also possible. The movement of the cutting element along the guide rail and a sideways movement of the insulation board can take place simultaneously.

If the guide rail is a round tube and/or the holder for a cutting element is pivotably mounted on this guide rail, mitre cuts can also be made in corner areas; the angle can be preset, for example, using an angle scale.

To achieve miter cuts that run across the entire width of the insulation board, it is intended that longitudinal guide elements are provided on both sides of the board body to be cut for the parallel displacement of the separating element, which are fixedly hinged to a base body on one side and are pivotably guided at the other end in a circular arc segment guide. This means that the parallel displacement can always be carried out between the fixed hinge point and the other end of the longitudinal guide elements guided in the circular arc segment guide.

If the circular arc segment guide has a one-sided toothing, an angle can be preset using a crank mechanism that engages the toothing, whereby an angle scale can be arranged on the swivel guide. Both swivel guides can be synchronized with one another via a continuous rail, whereby this rail can in particular form a guide rail for a cutting element and therefore performs a dual function. The end of the longitudinal guide elements guided in the circular arc segment guide can in particular represent an upper deflection point for a chain drive, so that the chain drive is also swiveled in the circular arc segment guide and the parallel displacement of the cutting element can be carried out in the same way at every swivel angle.

Further advantages and features emerge from the following description of an embodiment of the subject matter of the invention shown in the drawing.

In the drawing show:

Fig. 1 A cutting device according to the invention in diagrammatic

Overall view,

Fig. 2 the cutting device according to Fig. 1 in longitudinal side view

view,

Fig. 3 a front view of the cutting device,

Fig. 4 '■■■- the cutting device when arranged on a scaffold,

Fig. 5 a detailed view of the guide rail for the cutting

ment,

Fig. 6 a detailed view of the circular arc segment backdrop according to Fig.

2,

Fig. 7 different types of cuts of an insulation board,

Fig. 8 further cutting variants of the insulation board.

In detail, the cutting device 1 has a separating element 2, which is designed as a heatable separating element that extends laterally beyond the width of an insulation board 7 to be cut.

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Wire is formed. A rigid separating element that may only be guided on one side is also possible in principle. The cutting wire 2 is held at its lateral end areas 3, 4 on drive elements 6, whereby a parallel displacement of the cutting wire 2 can be brought about by moving the drive elements 6. This parallel displacement of the cutting wire 2 enables cuts to be made that cut through an insulation board (Fig. 7b) or cut out a part of its height (Fig. 7c) .

The drive elements 6 comprise two synchronized chain drives 8, which can be driven via a drive crank 9 located to the side of a chain drive 8.

To synchronize the chain drives 8, a shaft 10 is provided that can be driven by means of the crank 9 and that connects the lower chain wheels 11 of the chain drive 8 to one another. On the upper deflection axis 12 of the chain drive 8, a shaft 14 is provided that connects the upper chain wheels 13 to one another and is freely mounted in a pipe guide 15. This upper shaft 14 therefore does not cause any torque transmission between the two drive elements 6 arranged at the longitudinal ends 3 and 4 of the separating element 2 when the chain drive 8 moves.

In the present embodiment, the drive crank 9 is located on a side facing the user, so that when the cutting device 1 is arranged horizontally or at an angle according to Fig. 4 on external supports 16 of a scaffold 18 arranged in front of a building wall 17, the user can easily effect the parallel displacement of the separating element 2 from his movement space 19 by rotating the drive crank 9, without the movement space 19 on the scaffold 18 being restricted. According to Fig. 4,

In addition, a variable-length push rod 20 is provided to support the cutting device 1 against the scaffolding 18, so that its angular alignment is variable. In a position of use as shown in Fig. 4, it was necessary with the previous U-pressure brackets to apply a pressure force approximately along the arrow 21 to the cutting bracket, for which the operator had to lean far outwards over the scaffolding 18.

By turning the crank 9, the chain wheel 11 is set in rotation so that the straight sections 22 of the chain drive 8 are brought into an upward or downward movement. The cutting wire 2 is mounted on a straight section 22 of the chain drive 8 via an extension arm 23, whereby its movement is limited by a straight guide slot 24 to an upward and downward movement between the two extreme positions 25 and 26 shown in Fig. 3. Depending on the direction in which the crank 9 is rotated, the cutting element 2 is therefore moved up or down in the guide slot 24. A deviation from the straight movement of the cutting wire 2 is therefore not possible.

The guide slot 24 is electrically conductive, so that the separating element 2 can be supplied with an electrical voltage via different potentials on the two edge-side guide rails 24. The arms 23 can be separated from this by appropriate plastic insulation. Due to the heating of the separating element 2, only a small vertical force is necessary to cause the separating element 2 to cut through the insulation panel 7. Therefore, manual operation of the drive for the drive elements 6 is recommended - also for cost reasons - for which the crank 9 is designed in the present case. It goes without saying that motor drives are also possible, which can be arranged away from the cutting device 1 under certain circumstances. In

In any case, the driving force is transmitted to at least one drive element 6 located to the side of the separating element 2, the movement of which can cause the parallel displacement of the separating element 2. In the case of a cutting device 1 arranged vertically, for example, the drive element located to the side of the insulation board to be cut can also be located at the upper or lower edge area of the cutting device 1.

On a cutting device 1, which is equipped with a drive element 6 according to the invention, but also on other cutting devices, a guide rail 15 is arranged above a plate surface 31 of an insulation board 7 to be cut, which is placed on the base plate 5 of the cutting device 1, on which a cutting element 32, which is essentially perpendicular to the plate plane 31, is to be arranged. This cutting element 32 is therefore suitable for forming corner cuts, as indicated in Fig. 8c. For this purpose, the cutting element 32 is moved in the direction of the arrows 34, 35 on the guide rail 15, which can form a round tube, for example, on which a sleeve 33 for holding the cutting element 32 can be moved lengthwise. As soon as the desired cutting depth T is reached, the cutting element 32 can be rotated by 90°, for example, via a pivoting element 36, so that the cut S can then be made up to the front side of the insulation board 7 by pulling or pushing the insulation board sideways.

In the embodiment, the guide rail 15 forms a round tube, so that beveled cuts are also continuously possible by inclining the cutting element 32 on the round tube 15.

With a cutting device as described above, but also in principle with other cutting devices, such as those that have a pressure bracket.

, longitudinal guide elements 24 can be provided on both sides of the panel body 30 to be cut for parallel displacement of the separating element 2, which are hinged on one side to a base body 5 and whose other end is guided in a circular arc segment guide 40. This makes it possible to set any cutting angle for miter cuts, for example as shown in Fig. 76 or 8a and 8b. The longitudinal guide element 24 can also be pivoted so that the guiding of the separating element 2 in the longitudinal guide element 24 is ensured in the same way at any cutting angle. The circular arc segment guide 40 can be equipped with an angle scale.

To effect the pivoting movement, an upper crank drive 27 is provided which has at least one gear 28 which is firmly connected to the shaft 14 and which engages in a toothed profile 41 of the circular arc segment guide 40. In the exemplary embodiment, the shaft 14 is provided with gears 28 at both ends, which each engage in circular arc segment guides 40. As a result, the separating element 2 runs parallel and torsion-free for each pivoting angle α. By turning the crank 27, the gears 28 are rotated and, by engaging in the toothed profile 41, an angular adjustment of the upper deflection axis 12 of the drive elements 6 and the longitudinal guide elements 24, which in this case are designed as electrically conductive guide rails, is effected. The crank drive 27 can be operated from the side, so that in the arrangement according to Fig. 4, both the cutting angle α and the cutting angle α can be adjusted. the separating element 2 or the cutting element 32 can be adjusted for mitre cuts and the cut can be made in the same comfortable operating position.

The circular arc segment guides 40 are pivotably connected to the base plate 5 on both sides of the insulation board 30 to be cut and to compensate for tolerances on a pivot axis 42; the pivoting of the guide

·

rails 24 in the circular arc segment guides 40 is synchronized by the shaft 14 provided with gears 28 on both sides. A guide tube 15 is used for this purpose, which is used as a carrier for the additional cutting element 32 and to accommodate the shaft 14 that can rotate therein. The synchronization ensures that a different swivel angle of the two ends 3, 4 of the separating element 2 is avoided, as is tilting. The toothing between the gear 28 and the toothing profile 41 can be designed in such a way that an angle is fixed by this toothing alone. In addition, it is also possible to install a locking device with which the respective swivel angle α of the guide rail 24 can be secured in the guide 40.

The cutting angle α can be adjusted between 0 and 90°, so that cuts according to Fig. 7d or 7e are also possible.

In the respective set position of the swivel angle α, only the crank drive 9 must be operated in order to move the separating element 2 parallel in the guide 24. The cut is then made through the insulation panel 30 in accordance with the set swivel angle α. The drive crank 9 can be operated in any swivel angle position due to the free bearing of the crank 27.

When the upper deflection axis 12 is pivoted in the guide rail 40, the guide rail 15, which connects the two-sided guide rails 40 to one another, is also pivoted, so that the additional cutting element 32 can also be pivoted and corresponding miter cuts or cuts can also be made with it.

Therefore, without additional tools, the cutting device 1 according to the invention can be used to make both vertical and beveled cuts through the plate (Fig. 7b) and to make vertical or angled corner cuts (Fig. 8b, 8c) and to cut out recesses from the thickness of the plate according to Fig. 7a, 7c and 7f. In a cut according to Fig. 7c, for example, the separating element 2 can first be moved along the line H, where it is held, for example locked, in the right vertical intermediate position, where the plate is then pulled laterally past the separating element 2 and the cut L can thus be made.

The use of the cutting device 1 is particularly simplified by the lateral drive elements, and operating comfort and safety are significantly increased.

Claims (18)

Expectations 1. Cutting device (1) for cutting flat plastic plate bodies (7), in particular polystyrene rigid foam bodies, for insulating buildings, wherein the cutting device (1) comprises at least one heatable, parallel-displaceable separating element (2) which is forcibly guided at least on one side in its plane of movement, in particular a cutting wire which projects beyond the width of a plate body to be cut on both sides, the longitudinal extension of which runs approximately parallel to the plane of the flat extension of the insulation board and the parallel displacement of which can produce a separating cut which extends over the entire width of the insulation board and intersects the plane of the flat extension of the insulation board, characterized in that a drive element (6) for effecting the parallel displacement of the separating element (2) is assigned to at least one outer region of the separating element located to the side of the plate body (7) to be cut. 2. Cutting device according to claim 1 for a positively guided separating element on both sides of the plate body to be cut, characterized in that drive elements (6) are provided on both sides of the plate body (7) to be cut, which are synchronized with each other. 3. Cutting device according to one of claims 1 or 2, characterized in that the drive elements (6) each comprise a chain drive (8). 4. Cutting device according to claim 3, characterized in that the chain drives (8) are connected to one another via a continuous shaft (10) and one of the chain drives (8) can be driven. 5. Cutting device according to one of claims 3 or 4, characterized in that the drive elements (6) are each assigned a straight guide slot (24) extending in the direction of the parallel displacement of the separating element (2). 6. Cutting device according to claim 5, characterized in that the guide slot (24) is designed parallel to a straight section (22) of the chain drive (8). 7. Cutting device according to one of claims 5 or 6, characterized in that the guide slot (24) is electrically conductive. 8. Cutting device according to one of claims 3 to 7, characterized in that the drive (9) for the chain drive (8) is manually operated. 9. Cutting device for processing insulation boards (7) and similar board bodies, in particular polystyrene-containing insulation boards for external insulation of buildings, in particular according to one of claims 1 to 8, characterized characterized in that a guide rail (15) is arranged substantially parallel to the plate surface (31) and at a distance therefrom for receiving a cutting element (32) cutting the plate plane (31). 10. Cutting device according to claim 9, characterized in that the guide rail (15) forms a round tube. 11. Cutting device according to one of claims 9 or 10, characterized in that a holder (33) for a cutting tool (32) is pivotably arranged on the guide rail (15). 12. Cutting device according to one of claims 9 to 1 1, characterized in that the guide rail (15) is held on both sides outside the plate body (7) to be cut in lateral pivoting guides (40). 13. Cutting device for cutting insulation boards (7) or similar board bodies, in particular polystyrene-containing insulation boards for the external insulation of buildings, the cutting device (1) comprising at least one heatable separating element (2; 32), in particular a parallel-displaceable cutting wire (2) projecting beyond the width of a board body, in particular according to one or more of claims 1 to 12, characterized in that for the parallel displacement of the separating element (2) on both sides of the board body (7) to be cut, longitudinal guide elements (24) are provided, which are fixedly articulated on one side to a base body (5) and are pivotably guided at the other end in a circular arc segment guide (40). 14. Cutting device according to claim 12, characterized in that the circular arc segment guide (40) is pivotally connected to the base body (5). 15. Cutting device according to one of claims 13 or 14, characterized in that the circular arc segment guide (40) has a one-sided toothing (41) and a one-sidedly operable crank drive (27) is provided for adjusting the pivoting angle of the lateral longitudinal guides (24). 16. Cutting device according to one of claims 12 to 14, characterized in that the pivoting in the pivoting guides (40) is synchronized. 17. Cutting device according to claim 15, characterized in that a rail (15) connecting both pivot guides (40) to one another is provided for synchronizing the angles in the pivot guides (40). 18. Cutting device according to claim 17, characterized in that the rail (15) forms a guide rail for a cutting element (32).