DE2523258A1 - DEVICE FOR CUTTING PLASTERBOARD - Google Patents

Description

Device for cutting plasterboard

The invention relates to a device for cutting plasterboard by hand.

The cutting devices available on the market are well known poorly suited to this on the construction site because of their weight, space requirements and their cutting technology to be used.

The invention is based on the object of providing a cutting device that is easy to manufacture and cheap to use, even on the construction site.

The cutting device according to the invention comprises a frame consisting of two parts inside lower blade continuously adjustable in depth between 40 and 100 mm, this blade being an arrangement has two plates which can be lowered during the cutting process and which can be raised during transport.

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The upper cutting blade is mounted like a parallelogram and connected via a linkage to a manual control lever that allows it to go through at the moment of cutting .to develop an almost infinite force in a clamping effect .

An example embodiment will now be based on the accompanying drawings are explained in more detail in the

Pig. 1 in the view - with the front part removed shows the upper knife in the position in which the cutting is finished;

FIG. 2 shows part of FIG. 1 and shows the upper cutting blade in its upper position;

Fig. 3 is a section along A and shows the adjustment mechanism for the lower sheet;

Fig. 4 is a section along 3 and shows the assembly and use of the upper knife;

Fig. 5 is a section along C and shows the assembly of the lower knife with its to. cutting plasterboard receiving plate assembly and

Fig. 6 is a section along D and shows the fastening and installation of the lower knife in the frame clear.

In particular from FIGS. 1 and 4 it can be seen that \ ■: ■ that the illustrated cutting device comprises a frame consisting of two parts 1 and 2, the

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Parts are assembled by bolts and stiffening spacers 3 and 4, such that the cutting mechanisms are covered and protected. The frame further comprises a vertical guide plate 30 of fork shape, which is intended to hold the upper knife 16 at the side.

The stiffening intermediate pieces 4 take on the two double levers 12, which on the one hand over the axes 17 are articulated to the upper knife 16 and, on the other hand, to the push rods 18 and 19 via axes 20.

The stiffening intermediate piece 21 receives the lever 13, which is provided with a profiled end, in such a way that the push rod 19 and the axis 20 can be received. The lever 13 has a ring 14, which hook against the finger 15 for easy transport of the cutter by one or two people leaves.

Figures 1 and 6 show that two bolts 22 and 23 each penetrate elongated holes 22a and 23a and a lower one Pick up knife 5 and a stiffening intermediate piece 24 as well as the two legs of a bracket 8 on each side. More precisely from Fig. 3 it can be seen that each bracket 8 is held by a screw 7, which in a Carrier 25 is rotatable, which is pivotably mounted in the frame or frame 1-2. A nut 26 sets the axially Tighten screw 7 in pivot 25.

Fig. 5 shows that the lower knife 5 is stiffened by two profiles 6 which are fastened by bolts.

The lower knife 5 is surrounded by an arrangement of two plates 10, which are attached to two flanges 9 at 27

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are articulated, which are slidably mounted in the interior of the frame or frame 1-2. Two feathers 11 hold the flanges 9 in contact with the knife 5 at two locations 28.

Two extendable feet 31 contribute to a three-point support against the ground during the SehneidVorgangs.

Before this latter operation, an adjustment must be made according to the thickness of the plate to be cut will. For this purpose, after lifting the lever in the upper position (Fig. 2), the plasterboard is made on the the two plates 10 existing arrangement is stored. The screws 7 are then adjusted so that the distance E between the upper knife and the plate is a few millimeters. After adjusting the horizontal In the position of the plasterboard, the lever 13 is lowered by pressing the handle 29 by hand. The knife 16 is supported against the plasterboard and creates a lowering of the flanges 9 and 10 plates Arrangement; the distance D (Fig. 5) becomes zero.

The plasterboard is then gripped between the two knives 16 and 5. The downward movement of the Lever 13 continues; the lever arm of length L .. - schematized in Fig. 2 - goes into a value Lp adjacent zero, which gives the knife 16 a vertical force approaching infinity. The lever 13 is arranged in the lower position so that Lp is the specified Cutting force. ■ - '<.

After the break, the two plates 10 assume their rest position at height D (FIG. 5). Thanks to the above Arrangement ensures the knife 16 in its downward

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movement also for a shear movement along its Major axis, which means that the force required for cutting is reduced.

Patent claims:

509850/0326

Claims (7)

- D - Patent claims: Device for cutting plasterboard with a lower cutting blade, continuously adjustable with regard to its depth, inside a rack or frame; and an upper cutting blade which can be actuated by a simple lever via a parallelogram gear, characterized in that the gear mechanism has two double levers (12) which pivot about fixed axes (3), the axes on the one hand being connected to the upper cutting blade (16) via axes ( 17) and, on the other hand, are hinged to push rods (18; 19) which can be actuated by a simple lever in such a way that the distance between the axis (17) and the fixed axis (3) of the transition from the upper position to the lower position a value L ₁ transitions into a value Lp which is adjacent to zero. 2. Cutting device according to claim 1, wherein the frame or frame consist of two equal parts, characterized characterized in that the frame is formed from two shell housings (1; 2) which parallel to the cutting blades over their entire length and on both sides of them to protect the Cutting mechanism extend. 3. Cutting device according to one of claims 1 or 2, characterized in that the frame or the frame (1, 2) a fork-like vertical guide (30) for the lateral support of the upper knife (16). - 7 509850/0326 4. Cutting device according to claim 1, characterized in that the lower Knife (5) is surrounded by two identically designed supports (9) which are inside the housing shells (1 * 2) are displaceable, on which the two same reversible plates (10) are articulated in this way are that springs (11) the knife (5) in the lower stop (28) on the supports taking into account the Guide the height difference (D) of the knife (5). 5. Cutting device according to claim 1 and 4, characterized in that the storage of the upper knife (16) is designed in such a way that there is also a shearing movement in its downward movement includes along its major axis to reduce the cutting force. 6. Cutting device according to Anspruhh 1, characterized in that the lever (13) can be blocked in the lower position by a bracket (14) which is firmly connected to the lever (13) and which against a fixed to the frame (1; 2) connected pinger (15) can be hooked in such a way that the lever (13) as Handle is used for transport by one or two people. 7. Cutting device according to claim 1, characterized in that the frame or the frame (1, 2) has two extendable feet (31) such that the cutting device is horizontal during of the cutting process stored horizontally at three points is. articulated 509850/0326 Blank page