EP3278940B1 - Device for use in drywall construction - Google Patents

Description

Technical field

The invention relates to a device for dividing a plasterboard plate each having a cardboard layer on its two broad sides.

The invention also relates to a method for dividing a plasterboard.

State of the art

The WO 2012/020330 A1 describes a device for dividing a plasterboard. A slide can be moved on a guide rail which has a guide profile. The carriage carries a blade carrier which has a blade which, by pivoting the blade carrier from a rest position in which the blade does not engage the surface of the workpiece, can be brought into a working position in which a corner of the blade engages in the surface of the workpiece .

Devices for dividing plasterboard are also known from the US 2,835,037 , DE 36 24 429 C1 , US 2,098,641 , US 5,231,764 , US 8,434,235 B2 and US 4,903,409 .

A known device for fixing a guide rail on the surface of a workpiece has the form of a clamp, wherein one leg of the clamp can be inserted into a profile groove. The pressure screw of the clamp is clamped against the back of the workpiece from below.

A device for producing a chamfer on a plasterboard describes the DE 196 29 202 C2 . The device described there has the shape of a plane. The planer has a base body that carries two blades one behind the other in the cutting direction. The underside of the plane forms a support flank from which webs project at the two opposite ends, which form a contact flank for contacting a narrow side of the workpiece. The blade arrangement is located in the space between the two contact flanks, a chip exit opening being formed in each case in front of a cutting edge. A device for generating chamfers is also in the DE 87 03 786 described.

The FR 2.120.206 describes a dividing device with two blades arranged one behind the other in the cutting direction.

From the US 5,946,808 a device is known in which cutting knives with different knives can be pulled along a guide rail in order to cut different materials.

The US 2006/0201000 A1 describes a device for cutting workpieces with two blades, which can optionally protrude from mutually pointing ends of a blade carrier.

Summary of the invention

The invention has for its object to further develop a method and an apparatus for cutting plasterboard advantageously.

The object is achieved by the invention specified in claims 1 and 2. The subclaims represent advantageous developments of the invention.

A guide rail is placed on a broad side of the plasterboard provided with a cardboard layer. A contact surface of the guide rail comes in flat contact with the broad side. The top of the guide rail, which then faces upward, has a guide profile, for example a groove or a projection. The guide profile extends in the machining direction. A slide is provided which is displaceable along the guide profile with respect to the guide rail. It has a counter profile matching the guide profile, for example a groove or a projection engaging in a guide groove. The carriage has a first blade carrier. This carries a blade that goes from a rest position to a working position is feasible. In the rest position, no working section of the blade protrudes from a base body of the slide in such a way that it could have an effect on the upper side of the workpiece. The blade carrier can be brought from the rest position into a working position. In this working position, a working section of the blade protrudes from the underside of the base body carrying the blade carrier in such a way that moving the carriage along the guide rail leads to a severing of the cardboard layer. For this purpose, for example, a corner of the blade only needs to penetrate slightly into the surface of the workpiece in order to produce an incision that at least partially penetrates the cardboard layer. The plasterboard can then be bent around this incision. A kink forms on the cardboard layer opposite the divided cardboard layer. A fracture edge is formed through the gypsum core of the gypsum board, which extends along the incision. The following and / or advantageous properties are the following: a second blade is provided which can also be brought from a rest position into a working position. For this purpose, the second blade is held by a second blade carrier. The second blade carrier can preferably be pivoted about a second pivot axis. The first blade carrier and the second blade carrier can be moved independently of one another from the rest position to the working position and back. In the working position of the second blade carrier, a displacement of the slide causes the cardboard layer pointing away from the guide rail to be severed along the broken edge. This then results in a complete separation of the broken piece from the plasterboard. In a preferred embodiment of the invention it is provided that the cutting edges of the two blades point in opposite directions, so that when the slide moves along the guide rail, the cardboard layer pointing upwards towards the guide rail is severed and after breaking through the gypsum core of the gypsum plasterboard panel in one movement in the opposite direction the second blade, the cardboard layer pointing away from the guide rail severed. The plasterboard is thus cut to length in three successive processing steps, with the second blade carrier taking its rest position in the first processing step and the first blade carrier being brought into the working position. In this working position, the slide is moved in a first direction along the guide rail. In a second step, the core of the plasterboard is broken, so that the broken piece takes up an angle to the plate and is only connected to the plasterboard with the cardboard layer pointing away from the guide rail. In a third processing step, the second blade carrier is brought from its rest position into the working position. The first blade carrier takes its rest position. When the carriage is moved back along the guide rail, the other plasterboard layer is severed at a kink. The two blade carriers can each be assigned to the slide or to a base body so as to be pivotable about a pivot axis. The two swivel axes can run parallel to each other. In particular, it is provided that the swivel axes run perpendicular to the surface normal of the broad side or to the contact surface of the guide rail. The pivot axes also run perpendicular to the direction of extension of the guide profile. The first blade carrier can have a handle. The handle can have a foot. The foot can lie in a recess in the base body and can be pivoted there about the first pivot axis. A spring element can be provided which urges the first blade carrier into its rest position. The blade carrier can have a blade holder. This blade holder can be slidably arranged in a handle cavity. For this purpose, the handle cavity has a shaft in which the blade holder is inserted. The foot can have a base area into which the cavity opens. The blade can be moved out of the base area through this base surface opening. This is done by moving the blade holder relative to the handle. The handle can be formed by two handle shells. Locking means can be provided be in order to fix the blade holder in different displacement positions with respect to the handle. This allows the depth of cut to be adjusted. The blade holder can also be moved out of the shaft of the handle to such an extent that the blade can be replaced. It is preferably a trapezoidal blade, which is connected to the blade holder in a form-fitting manner against a contact surface of the blade holder. A pointed corner of the first blade can protrude from the base of the foot. In the use position, the handle preferably protrudes upward from the basic carrier. If the handle is moved in the cutting direction of the first blade, the torque exerted on the handle causes the first blade carrier to pivot into the working position. If the handle is acted upon in the opposite direction, that is to say during the movement in which the second blade is used, the first blade carrier is acted upon by torque in the opposite direction. However, the first blade carrier cannot pivot because of a stop. The slide can thus be pushed back and forth with the handle, the first blade carrier being pivoted only in the outward movement. The second blade can be carried by a blade holder, which can be pivoted through 90 °. In the working position, the second blade preferably has a 30 ° to 60 °, preferably a 30 ° to 60 °, inclination to the broad side surface or to the contact surface of the rail. It is preferably a 45 ° angular position. The blade can be a blade with a hook-shaped cutting edge. The blade is arranged on the base body in such a way that the hook of the hook-shaped cutting edge in the working position of the second blade lies perpendicularly below the path of movement of the first blade in the first cut, so that the second cardboard layer can be severed with the hook-shaped second blade in the second cut. The second blade thus has a section that crosses an imaginary plane that runs perpendicular to the contact surface of the guide rail, this plane running through the cutting line generated by the first blade or through the cutting edge of the first blade. In their rest position the second blade in a niche of the basic body. When using the device, the plasterboard to be cut is in a horizontal plane, so that the guide rail can be placed on the upward-facing broad side surface of the plasterboard. A handle then protrudes from the body. This handle is pivoted on the first cut. As a result, the blade moves from its rest position to the working position. If the handle is released, the spring described above automatically returns the handle to a rest position of the first blade. A rotary knob protrudes from one side surface of the base body. This knob is the second blade holder that has a blade carrier that has an inclined contact surface for the second blade. By rotating the pivot axis, the second blade is brought from its rest position, in which the blade lies in a recess of the base body, to its working position, in which it crosses an imaginary cutting plane of the first blade at an oblique angle. In a further development of the invention, fastening means can be provided, in particular on the base body, with which a fixing device, as described below, can be fastened to the device. In particular, it is provided that the base body has a pocket in which one or more fastening devices, in particular in the form of fastening tongues, are arranged, with which a fixing element can be detachably fastened to the device. The fixing element can be inserted into a groove of a guide rail and has mandrels which press into the surface of the workpiece when the guide rail is placed on a workpiece. The pocket can be designed in such a way that two fixing elements can lie one behind the other in the direction of extension. Each fixing element is fastened in the pocket with a pair of locking tongues.

Brief description of the drawings

Fig. 1

in einer perspektivischen Darstellung eine Vorrichtung zum Zerteilen einer Gipskartonplatte, die auf einer Gipskartonplatte 6 aufliegt,

Fig. 2

die Frontansicht eines auf einer Führungsschiene 1 verschieblichen Schlittens,

Fig. 3

eine Frontansicht des Schlittens,

Fig. 4

eine Unteransicht des Schlittens,

Fig. 5

eine Draufsicht des Schlittens,

Fig. 6

den Schnitt gemäß der Linie VI-VI in Figur 5, wobei eine erste Klinge 11 in einer Verwahrstellung einliegt und der die erste Klinge 11 tragende Klingenträger 12, 13, 14 eine Ruhestellung einnimmt,

Fig. 7

eine Darstellung gemäß Figur 6, bei der ein Klingenhalter 12 derart aus einer Griffanordnung 13, 14 herausverlagert ist, dass die Klinge 11 gewechselt werden kann,

Fig. 8

eine perspektivische Darstellung des Schlittens 10 in der in Figur 7 dargestellten Betriebsstellung,

Fig. 9

eine Darstellung gemäß Figur 6, wobei die Klinge 11 eine Betriebsstellung einnimmt, in der eine Ecke 11' der Klinge 11 aus einer Unterseite 20 eines Fußes 30 herausragt und der Klingenträger 12, 13, 14 in eine derartige Arbeitsstellung gebracht worden ist, in welcher die Ecke 11" einen Einschnitt 9' in eine Kartonlage 8 einer Gipskartonplatte 6 erzeugt,

Fig. 10

eine weitere Seitenansicht des Schlittens 10, wobei der erste Klingenträger 12, 13, 14 seine Ruhestellung einnimmt und ein zweiter Klingenträger 24, 26 von seiner in den Figuren 1 bis 9 dargestellten Ruhestellung in eine Arbeitsstellung gebracht ist,

Fig. 11

einen Schnitt gemäß der Linie XI-XI in Figur 10, in dem ersichtlich ist, dass die zweite Klinge 25 in ihrer Arbeitsstellung unterhalb der von der ersten Klinge 11 erzeugten Schnittlinie liegt, um entlang einer Bruchkante 9 die nach unten weisende Kartonlage 8' zu durchtrennen,

Fig. 12

eine weitere perspektivische Darstellung des Schlittens 10, wobei der zweite Klingenträger 24, 26 seine Arbeitsstellung einnimmt,

Fig. 13

eine erste Explosionsdarstellung,

Fig. 14

eine zweite Explosionsdarstellung.

The invention is explained in more detail below on the basis of exemplary embodiments. Show it:

Fig. 1

a perspective view of a device for dividing a plasterboard, which rests on a plasterboard 6,

Fig. 2

the front view of a sliding on a guide rail 1,

Fig. 3

a front view of the sled,

Fig. 4

a bottom view of the sled,

Fig. 5

a top view of the sled,

Fig. 6

the section along the line VI-VI in Figure 5 , wherein a first blade 11 lies in a storage position and the blade carrier 12, 13, 14 carrying the first blade 11 assumes a rest position,

Fig. 7

a representation according to Figure 6 , in which a blade holder 12 is displaced out of a handle arrangement 13, 14 in such a way that the blade 11 can be changed,

Fig. 8

3 shows a perspective illustration of the slide 10 in the operating position shown in FIG. 7,

Fig. 9

a representation according to Figure 6 , wherein the blade 11 assumes an operating position in which a corner 11 'of the blade 11 protrudes from an underside 20 of a foot 30 and the blade carrier 12, 13, 14 has been brought into such a working position in which the corner 11 "has an incision 9 'produced in a cardboard layer 8 of a plasterboard 6

Fig. 10

a further side view of the carriage 10, the first blade carrier 12, 13, 14 assuming its rest position and a second blade carrier 24, 26 from its in the Figures 1 to 9 shown rest position is brought into a working position,

Fig. 11

a section along the line XI-XI in Figure 10 , in which it can be seen that the second blade 25 lies in its working position below the cutting line generated by the first blade 11 in order to sever the downward-pointing cardboard layer 8 ′ along a breaking edge 9,

Fig. 12

5 shows a further perspective illustration of the slide 10, the second blade carrier 24, 26 taking up its working position,

Fig. 13

a first exploded view,

Fig. 14

a second exploded view.

Description of the embodiments

The Figures 1 to 14 show an embodiment of the invention, which is a device for dividing a plasterboard 6. A gypsum plasterboard has a core of gypsum and two broad sides 7, 7 'pointing away from one another, each of which is coated with a layer of cardboard 8, 8' which gives the gypsum plasterboard 6 stability. In order to cut a plasterboard 6 along a cutting line 9 ', an incision 9' is first made in a first broad side 7. Then the gypsum core of the gypsum board 6 is broken along this section line 9 ', so that a broken edge 9 is formed and the broken-off part is only connected to the rest of the board via the now bent second board layer 8'. The complete division takes place by means of a second cut, in that the second cardboard layer 8 'is divided along an articulation angle. The in the Figures 1 to 14 shown device allows a simplified implementation of this method.

A guide rail 1 is provided, which can be an aluminum profile body. The guide rail 1 forms a guide profile 2. It is a projection 5 that extends along the guide rail 1. The projection 5 forms a guide groove 3 on its rear side, namely the contact surface of the guide rail 1. The guide groove 3 is an undercut groove 3, the undercuts being formed by projections 5 which protrude into the interior of the groove in the region of the mouth of the groove 3. The guide profile 2 forms a further projection 4 which projects laterally from the guide profile 2.

A base body of the dividing device is referred to below as a carriage 10. The carriage 10 has a guide recess 23 into which the guide rib formed by the guide profile 2 projects. The guide recess 23 has a plurality of projections 36 which can engage in the space between the projection 4 and the rail body of the guide rail 1. The carriage 10 is thus positively connected to the guide profile 2 and displaceable along the guide profile 2.

The carriage 10 forms a base body 22 which has the guide recess 23 and a recess 29. In the recess 29, which has an essentially rectangular plan, there is a foot 30 of a handle, which consists of two handle shells 13, 14. The foot 30 is pivotally mounted within the recess 29 by means of a pivot axis 18. The pivot axis 18 is located on a first side of the foot 30, which forms a short lever arm. On the other side of the foot 30 there is a stop shoulder 32, which rests against a stop 31 in the rest position of the handle arrangement 13, 14. In this rest position, an underside 20 of the foot 30 extends at an acute angle within the recess 29 to the underside of the base body 22.

A blade holder 12 is located within the handle 13, 14. The blade holder 12 has a contact surface against which a trapezoidal blade 11 bears. A corner 11 "of the cutting edge 11 'of the blade 11 projects beyond a lower end of the blade holder 12. The upper end of the blade holder 12 has locking projections 16 which can engage in locking recesses 17 of the handle shells 13, 14. By pressing a push button 15 and an elastic deformation of the blade holder 12, the locking projections 16 can emerge from the locking niches 17, so that the blade holder 12 within the grips 13, 14 of the in the Figure 6 shown custody of the blade 11 in the in Figure 7 shown changing position of the blade 11 can be brought. In this position, the section of the blade holder 12 carrying the blade 11 projects substantially completely out of the underside 20 of the foot 30.

The blade holder 12 is arranged in the channel 21 formed by the handle scales 13, 14 so as to be longitudinally displaceable and fixable with the latching means 16, 17 in such a way that in an operating position such as that shown in FIG Figure 9 shows, a corner 11 "protrudes from the underside 20 of the foot 30. The handle 13, 14 takes its in the Figure 10 shown rest position, the corner 11 "does not protrude beyond the underside of the base body 22, but is located completely within the recess 29.

By applying a torque to the handle 13, 14, the handle 13, 14 can be pivoted about the pivot axis 18. As a result, the leg spring 19 is tensioned. The stop shoulder 32 moves away from the stop 31 and the corner 11 ″ of the blade 11 protrudes under the underside of the base body 22, so that the cutting edge 11 ′ creates an incision 9 ′ in the cardboard layer 8 when the slide 11 is displaced longitudinally , 14 released again, then the then relaxing spring 19 returns the blade carrier 12 formed by the handle 13, 14 to the rest position.

In this first working position of the first blade 11 described above, (see Figure 9 ) a first incision 9 'is made in an upward facing cardboard layer 8 of a plasterboard 6, in which the cardboard layer 8 lying on top is completely severed. The spring 19 has such a spring force that when the handle arrangement is acted upon, the handle 13, 14 pivots, so that the cutting edge 11 'cuts an incision 9' into the cardboard layer 8.

In a second step, the core of the gypsum plasterboard 6 is then broken, so that a section 6 hangs down vertically from the rest of the board located in the horizontal plane, as is the case Figure 11 shows.

A second blade 25 is provided for severing the downward-facing second cardboard layer 8 'in the region of the crease formed. The second blade 25 is arranged inclined relative to the base body 22 in such a way that its cutting edge 25 'in the working position of the second blade 25 is located perpendicularly below a line through the first blade 11 in the cutting direction and is thus able to be at a 45 ° - Angle the cardboard layer 8 '. To do this, the slide is moved in the opposite direction. This is also done by introducing a force into the handle, which does not then pivot, however, since the stop shoulder 32 bears against the stop 31.

The second blade 25 is carried by a second blade carrier 24, 26. A blade holder 24 has a contact surface 35 which has a surface normal which is inclined by 45 ° to a pivot axis 27, with which the blade holder 24 can be pivoted by 90 ° relative to the base body 22. The pivot axis 27, like the pivot axis 18, lies in a horizontal plane in the normal position of use of the device and extends perpendicular to the direction of extension of the guide profile 2 or to the direction of extension of the guide recess 23, that is to say the direction of movement of the slide 10.

The second blade holder 24 is overlaid by a cap 26, which can also perform a holding function in order to hold the blade 25 on the contact surface 35.

The blade holder 24 is inserted in a bearing recess 33 on a side wall of the slide 10. An axle journal 34 protrudes from a bottom surface of the bearing recess 33 and protrudes into a bearing cavity in the blade holder 24. The pivot axis 27 is inserted in a bore in the axle journal 34.

The blade 25 is positively attached to the blade holder 24. For this purpose, fastening ribs of the blade holder 24 protrude into fastening niches of the blade 25 designed as a double hook blade. The cutting edge 25 'of the blade 25 has an arch shape. The hook thus formed makes the separating cut through the cardboard layer 8 '.

Except for the fastening screws with which the two handle shells 13, 14 are connected to one another, the blades 11, 25 and the axes 18, 27 and the spring 19, the other components, i.e. the handle shells 13, 14, the blade holder 12, the base body 22, the blade holder 24 and the cap 26 are made of plastic. <b> List of reference symbols </b> 1 Guide rail 18th Swivel axis 2nd Leadership profile 19th feather 3rd Groove 20 bottom 4th head Start 21 channel 5 head Start 22 Basic body 6 Workpiece, plasterboard 23 Guide recess 7 Broadside 24th second blade holder 7 ' Broadside 25th blade 8th Cardboard layer 25 ' Cutting edge 8th' Cardboard layer 26 cap 9 Breaking edge 27 Swivel axis 9 ' Incision, cutting line 28 niche 10th Sledge 29 Recess 11 blade 30th foot 11 ' Cutting edge 31 attack 11 " corner 32 Stop shoulder 12th first blade holder and holder 33 Bearing recess 13 Handle shell, handle arrangement 34 Axle journal 14 Handle shell, handle arrangement 35 Contact surface 15 Push button 36 head Start 16 Locking projection 17th Rest niche

Claims (13)

1. Method for dividing a plasterboard (6) having a cardboard layer (8, 8') on each of its two broad sides (7, 7'), in which method a guide rail (1) having a guide profile (2) is placed on a broad side (7) of the plasterboard (6), and, in a first step, by moving a carriage (10) carrying a first blade (11) by means of a first blade carrier (12, 13, 14) along the guide profile (2), the cardboard layer (8) facing the guide rail (1) is cut through by the first blade carrier (12, 13, 14) which is brought from a first idle position into a first working position when the carriage (10) is moved, and then, in a second step, the plasterboard (6) is broken around a breaking edge (9) along the cardboard layer (8') facing away from the guide rail (1), characterised in that, in a third step in which the first blade carrier (12, 13, 14) is in the first idle position, a second blade (25) which is held by a second blade carrier (24, 26) of the carriage (10), which second blade carrier (24, 26) is in a second idle position during the first step, is brought from the second idle position into a second working position, and, by means of the carriage (10) being moved back along the guide profile (2), the cardboard layer (8') facing away from the guide rail (1) is cut through along the breaking edge (9).
2. Device for carrying out the method according to claim 1, comprising a guide rail (1) which can be placed by means of a support surface on the broad side (7) of the plasterboard (6) and has a guide profile (2), and comprising a carriage (10) which can be moved along the guide profile (2) and carries a first blade (11) which can be brought from a first idle position into a first working position which causes the cardboard layer (8) facing the guide rail (1) to be cut through when the carriage (10) is moved such that the plasterboard (6) can be broken around a breaking edge (9) along the cardboard layer (8') facing away from the guide rail (1), and comprising a second blade (25) which can be brought from a second idle position into a second working position, characterised in that the second blade (25) is carried by a second blade carrier (24, 26), and, in the second working position, is inclined with respect to the support surface of the rail such that a portion of the second blade (25) crosses an imaginary plane which extends through the cutting line generated by the first cutting edge and perpendicularly to the support surface.
3. Device according to claim 2, characterised in that the first blade (11) is carried by a first blade carrier (12, 13, 14) which is associated with a main body (22) of the carriage (10) so as to be pivotable about a first pivot axis (18), it being provided in particular that the pivot axis (18) extends perpendicularly to the surface normals of the broad side (7) or a support surface of the guide rail (1) and perpendicularly to the direction of extension of the guide profile (2).
4. Device according to either claim 2 or claim 3, characterised by a handle (13, 14) which carries the first blade (11) and has a foot (30) which is arranged in a recess (29) of the carriage (10) or of the main body (22), it being provided in particular that the foot (30) can be pivoted about the pivot axis (18).
5. Device according to either claim 3 or claim 4, characterised in that the first blade carrier (12, 13, 14) is held in the first idle position by means of a spring (19).
6. Device according to any of claims 3, 4 or 5, characterised by a blade holder (12) which is associated with the first blade carrier (12, 13, 14) and is movably arranged between two handle shells (13, 14) for changing the first blade (11) or for adjusting the cutting depth.
7. Device according to either claim 5 or claim 6, characterised in that the first blade (11) projects only with a tip of a corner (11") from an underside (20) of the foot (30) in the first working position.
8. Device according to any of claims 3 to 7, characterised in that the second blade carrier (24, 26) is associated with the main body (22) so as to be pivotable about a second pivot axis (27).
9. Device according to claim 8, characterised in that the second blade (25) extends at angle of inclination in a range between 30° and 60°, preferably 45°, with respect to the broad side (7) or to the contact surface of the guide rail (1) in the second working position and a portion of the cutting edge (25') of the second blade (25) intersects an imaginary plane which extends perpendicularly to the support surface of the guide rail (1) and which passes through the cutting line (9') generated by the first blade (11).
10. Device according to either claim 8 or claim 9, characterised in that the second pivot axis (27) extends perpendicularly to the surface normals of the broad side (7) or the support surface of the guide rail (1) and perpendicularly to the direction of extension of the guide profile (2).
11. Device according to claim 10, characterised in that the second blade (25) abuts a contact surface (35) which is inclined at an angle of in particular 30° to 60°, preferably 45°, with respect to the second pivot axis (27).
12. Device according to any of claims 2 to 11, characterised in that the second blade (25) has a hook-shaped cutting edge (25').
13. Device according to any of claims 3 to 12, characterised in that the cutting edge (25') is in a recess (28) of the main body (22) in the second idle position.

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