Cutlery – Cutting tools – With material receiving opening
Patent
1994-10-14
1997-08-26
Jones, Eugenia
Cutlery
Cutting tools
With material receiving opening
30280, 30294, 30299, 30317, 83883, B26B 300, B26D 308
Patent
active
056599617
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to a cutting tool to perform cutting operations on board material. Hitherto, use has been made of a panel saw or an electric keyhole saw. These tools have been excellent and efficient for the cutting of materials, such as plywood, plastic, masonite, plaster, metal and other such materials. These tools have been useful for the building of houses but have also been impractical, especially if electricity is not available. The tools have also been difficult to use when interior walls are to be covered with plasterboard. The materials must as a rule be given dimensions adjusted to the walls where they are to be applied, and since plasterboard is only supplied in standard sizes, the sawing of edge parts is required. The most practical method in this respect is to draw a line with a pencil along which the sawing is to be made. This is time consuming.
OBJECTS OF THE INVENTION
The object of the invention is to achieve the removal of the edge parts on a plasterboard in a very quick and simple manner, without a saw and without the drawing of a guide line. The inventor has created a device which only requires movement along the upper side of a plasterboard, whereby during this movement, the device achieves a penetration depth along the direction of movement.
SUMMARY OF THE INVENTION
The device is appropriately fitted with a transverse measuring device which has a contact lip in relation to the outer edge on the edge part which is to be removed. The device according to the invention has a lower part intended to be moved along the underside of the plasterboard. The lower part is held fixed relative to an upper part of the device by means of magnetic attraction. The plasterboard is thus clamped between two parts of the device which ensures stability to movement of the plasterboard. The lower part can also be fitted with a cutting device so that a score is achieved on the underside of the plasterboard, whereby the two cutting devices are so positioned on their respective parts that the score on the upper side and underside of the plasterboard lie in the same plane.
The score depth from both sides of the plasterboard can be of sufficient depth so that a complete cut is achieved, or can also have a limited depth of penetration so that a thin attached part remains which can be broken with a light tap on the edge which is to be removed.
Additional characteristics of the present invention are indicated in the following claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the upper part of a cutting tool;
FIG. 2 shows the lower part of a cutting too; and
FIG. 3 shows the function of the cutting tool in longitudinal section.
DETAILED DESCRIPTION OF THE INVENTION
In the Figures, 1 is a perspective view of the upper part of the cutting tool and 2 is the lower part of the cutting tool. The upper and lower parts 1 and 2 are intended to be placed opposite each other for operation. The lower part 2 of the cutting tool has three units 3, 4 and 5, which have the form of cylindrical bodies. The upper part of the tool also has three corresponding units 21, 7, 6. Unit 21 is covered in FIG. 1, but shown in FIG. 3. The units 21, 7, 6 also have a cylindrical character and are located directly above the cylindrical units 3, 4 and 5 when the upper part 1 and the lower part 2 are caused to lie in opposition to each other. Three unit-pairs are thus created. By means of these unit-pairs, the upper part 1 and lower part 2 are fixed so that they directly oppose each other. All the units consist of permanent magnets and their magnetic strength is determined empirically so that sufficient attraction is achieved between the two tool parts 1 and 2, when a board is placed between these. Alternatively, the units in one of the tool parts 1 and 2 can consist of ferro-magnetic material and the units in the other part of permanent magnetic material. It is also possible that instead of metallic, cylindrical units, electromagnetic units which perform the same function as the metallic units
REFERENCES:
patent: 2529210 (1950-11-01), Butler
patent: 2611179 (1952-09-01), Butler
patent: 3174225 (1965-03-01), Abraham
patent: 3286351 (1966-11-01), McAlister
patent: 3610079 (1971-10-01), Ashby
Gyproc Group AB
Jones Eugenia
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