Woodworking – Cutter hood or dust conveyor – With sifter – sorter – or separator
Patent
1994-01-14
1995-06-13
Bray, W. Donald
Woodworking
Cutter hood or dust conveyor
With sifter, sorter, or separator
15301, 144251A, 83100, 409134, 409137, B27G 2100
Patent
active
054233593
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a protective hood for wood cutting machines for covering a cutting tool which is fastened to a spindle, projects vertically from a machine table, and is situated under the protective hood. The protective hood is arranged on the machine table and has two side walls connected with one another by a rear wall, a cover, and a vertically adjustable front protective shield.
The subject matter of DE-OS 39 31 141 is a chip catching device for a table-mounted cutting machine for cutting curved wooden workpieces. This chip catching device has a protective hood of the constructional type outlined above with a transparent protective shield which can be adjusted vertically so as to adapt to the feed gap for the workpieces with respect to height.
SUMMARY OF THE INVENTION
The present invention has the object of providing a protective hood for wood cutting machines in which the protective shield only allows a gap with the height absolutely necessary for the workpiece and which, at the same time, guides this workpiece in such a way that the cutting process can be carried out as safely as possible.
This object is met according to the invention in a protective hood of the generic type mentioned above in that the lower edge of the protective shield can be adjusted vertically upward against spring force.
This solution has the considerable advantage that the spring force exerts a contact pressure on the workpiece so that this workpiece is pressed against the machine table from above and is always guided reliably during cutting.
In a further development of the invention, the underside of the lower edge of the protective shield slopes upward diagonally relative to the horizontal machine table proceeding from one side of the center region. In this way, a feed gap is created which allows the workpiece to be fed to the cutting tool easily. For this purpose, the underside of the lower edge advantageously extends parallel to the machine table in its center region and slopes upward obliquely toward both sides.
In a preferred embodiment of the invention, the lower edge of the protective shield is rigidly connected with the protective shield which is displaceable vertically upward against spring force in two guide members fastened to the protective hood.
Additional features and advantages of the invention are indicated in the patent claims and in the following description of an embodiment example shown in the drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows an oblique view of a protective hood, according to the invention, which is arranged at a wood cutting machine;
FIG. 2 is a view of the protective shield;
FIG. 3 shows a partial section of the protective shield; and
FIG. 4 shows a vertical section through the protective shield in the region of a guide strip.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a horizontal machine table 10 of a wood cutting machine on which is secured a protective hood 12 which covers the work area of a cutting tool 100 which is attached to a spindle. The protective hood 12 includes two side walls 14, a rear wall 16 connecting the latter, and a cover 18 which is rigidly connected with the rear wall 16. An edge 20 projects downward from the cover 18 at the front and sides and has in its front region a cut out portion 22 which opens downward and provides a larger view into the interior of the protective hood 12. The cover 18 has a connection piece 24 in its rear area for connecting a suction device.
The two side walls 14 are displaceable in the horizontal direction independently from one another. For this purpose, each side wall 14 has an upper, horizontally extending longitudinal slot 26 through which is inserted a knurled screw 28 which is screwed into a threaded bore hole, not shown, at the downwardly projecting edge 20 of the cover 18. By loosening the knurled screw 28, the corresponding side wall 14 at the protective hood 12 can be adjusted toward the front or toward the rear.
Each side wall 14 has in its lower area an
REFERENCES:
patent: 2008391 (1935-07-01), Hartzell et al.
patent: 3786846 (1974-01-01), Mehring
patent: 4484845 (1984-11-01), Pennello, Jr.
patent: 4821365 (1989-04-01), Chanters
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