Cutting – Interrelated tool actuating means and guard means – Work guard
Patent
1988-09-23
1989-12-12
Yost, Frank T.
Cutting
Interrelated tool actuating means and guard means
Work guard
83478, 83489, 83490, B27B 518
Patent
active
048859664
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION AND PRIOR ART
This invention is related to a sawing machine according to the preamble of appendent claim 1.
With certain machines it is intended that the operator manually has to adjust the rotatable element and accordingly the guard for the saw tool in a suitable position. As soon as a change of the position of pivoting of the arm relative to the body is carried out, this necessitates normally also adjustment of the rotatable element and thereby the guard so that it is correctly positioned relative to the saw tool. Such a correct position is of utmost importance to prevent dangerous spreading of material released by the saw tool and is also desirable from the view point of working environment to avoid spreading of cooling fluid supplied to the saw tool. Since normally adjustment of the position of pivoting of the arm relative to the body must be carried out relatively frequently by the operator, the manual adjustment work required thereby as to the position of the rotatable element and thus the guard causes considerable extra work burden on the operator.
Efforts generally in accordance with the preamble of claim 1 have been made to automatize the adjustment of the rotatable element and thereby the guard for the saw tool to be dependent on the adjustment of the arm relative to the body. One has tried to achieve this by arranging, for instance, link arms operating according to the parallelogram control principle, e.g. combined with a worm gear mechanism controlling the mutual position of the link arms, but such efforts have not led to any satisfactory results. The link arms arranged externally on the machine cause a relatively complicated construction and are relatively bulky and in addition the link arm system is very exposed to damage. The link arms often also cause unacceptable limitation of the pivoting movement of the arm.
SUMMARY OF THE INVENTION
The object of the present invention is to reduce disadvantages mentioned and provide an efficiently operating device for automatic rotation of the element and thereby change of the position of the guard relative to the arm in dependence upon the pivoting of the arm relative to the body, which device should be relatively uncomplicated and require small space.
This object is achieved according to the invention by providing the sawing machine with the features appearing by the characterizing portion of appendent claim 1.
Preferable developments of the sawing machine according to the invention are subject to the dependent claims 2-10.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, a more specific description of an embodiment example of the invention will follow hereinafter.
In the drawings:
FIG. 1 is a perspective view of the sawing machine from the upper side thereof, the guard for the saw tool having been omitted,
FIG. 2 is a perspective view of the sawing machine viewed in the opposite direction compared to FIG. 1,
FIG. 3 is a cross section taken along the line III--III in FIG. 1, the pivotable arm of the machine being pivoted upwardly so that the section passes through and along the center of the arm,
FIG. 4 is a section through the pivotable arm parallel to its plane of pivoting, it being remarked that the view is highly diagrammatical and has been simplified by omitting details otherwise appearing from FIG. 3; the view illustrates the fluid motor built into the arm and the fluid supply thereof,
FIG. 5 is a likewise simplified and diagrammatical view illustrating co-operation between components contained in the device for rotating the rotatable element and accordingly changing the position of the guard relative to the arm, the viewing direction being parallel to the pivot axis of the arm,
FIG. 6 is a side view of the complete sawing machine including guard for the saw tool, the machine being illustrated attached to a rail and during sawing in e.g. a wall, to which the rail is secured,
FIG. 7 is a cross section along the line VII--VII in FIG. 6, and
FIG. 8 is a view similar to FIG. 5 but illustrating an al
REFERENCES:
patent: 2996088 (1961-08-01), Hensley
patent: 3323507 (1967-06-01), Schuman
patent: 3722497 (1973-03-01), Hiestand et al.
patent: 4318324 (1982-03-01), Hall et al.
patent: 4343213 (1982-08-01), Drixler
Jones Eugenia A.
Yost Frank T.
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