Cutlery – Cutting tools – Saw
Patent
1994-09-06
1996-10-22
Eley, Timothy V.
Cutlery
Cutting tools
Saw
30233, 83478, 451358, 451456, B23D 4516
Patent
active
055664571
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a joint cutter comprising a tool set operated by a drive that is provided with a housing, and a covering that partially surrounds the tool set and comprises two mutually attachable sections like a casing, with a slot through which a segment of the tool set can project.
Using such a joint cutter, which can be used, for example, for performing the slotting operations that are required in the course of electrical installation work, elongated slots can be cut in walls without any problems; when this is done, the slots can be cut in any direction, which is to say, downward from above, or upward from below. Because the disks can be adjusted relative to each other, slots of any width can be produced. In addition, appropriate joint cutters incorporate means for collecting any dust that is generated by vacuuming it up.
Safety regulations require that the tool set be largely covered, so that only one segment, with which work is being performed, remains exposed. If one wishes to cut slots in projections such as lintels or the like, joint cutters of this kind cannot be used in the horizontal area. Rather, a slot for a cable, pipe, or the like has to be made by chiselling out the appropriate surface. This is a disadvantage it work is being done professionally, for such chiselling operations take up a great deal of time, and they cannot be performed with the high degree of precision that is possible with a power tool.
DE 38 11 197 A1 describes an adapter for a machine tool that is guided by hand; in this, a grinding or milling disk is partially covered by a housing that exposes a segment that can be adjusted for height.
DE 39 19 649 A1, describes an angle-grinder safety cover that is in one part and surrounds a grinding disk by sections.
EP 0 314 954 describes a two-part cover for a hand tool, which is divided into two parts parallel to a diamond disk, that is used to cut grooves.
In a two-part protective housing for a joint cutter, a front section can be pivoted to a rear section of the housing, and the first section is connected to a load-bearing cable that runs, for example, from a nail that is driven into a wall (DE-B 052 099). Such a protective housing is awkward to use and suffers from the disadvantage that the front section pivots back in an uncontrolled manner. Because of the fact that the front section pivots into the area of the rear section, there is no possibility of attaching a suction connector to this, since the opening of such a connector could be covered over by the front section.
Thus, it is the task of the present invention to so develop a joint cutter of the type described heretofore that slots can be cut without any problem in the transition area between surfaces that are disposed at an angle to each other, so that, as it were, the cut be made "around a corner," without any need for auxiliary devices in addition to the joint cutter.
According to the present invention, this problem has been solved in that a mounting extends from the drive housing, this being connected to a rear section of the covering such that the height of the segment of the tool set that projects from the slot is adjustable; in that a front section of the covering, which can be removed from the rear section that incorporates a vacuum connector, covers an additional segment of the circular tool set, the segments of the tool are defined by chords which intersect perpendicularly or essentially perpendicularly when the front section of the covering is removed.
Consequently, according to the present invention, it is possible to cut slots in corner areas or in the transition area between two surfaces that form a right-angle, and to do so without any difficulty, since all that is required is to remove the front section of the covering so that an additional segment of the tool set is exposed in order to the perform the work, this segment being preferably perpendicular to segment that is otherwise exposed.
In order to permit simple but secure assembly of the sections of the housing, the edges of one section
REFERENCES:
patent: 4188934 (1980-02-01), Reinhart et al.
patent: 4236356 (1980-12-01), Ward
patent: 4243011 (1981-01-01), Bodycomb et al.
patent: 5074044 (1991-12-01), Duncan et al.
Batschari Constantin
Mittlander Herbert
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