Woodworking – Rotary cutter – Having slotted bit seat
Reexamination Certificate
1998-05-01
2001-03-20
Dexter, Clark F. (Department: 3724)
Woodworking
Rotary cutter
Having slotted bit seat
C144S218000, C144S241000, C407S037000, C407S045000, C407S113000, C083S698610
Reexamination Certificate
active
06202721
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an arrangement for mounting cutting blades in radially stepwise adjustable positions in cutting heads for the machining of wood or plastic.
Cutting heads for working or machining wood or plastic are operated at high speeds whereby the cutting heads are subjected to high centrifugal forces during operation. This requires secure mounting of the cutting blades in the cutting head so that they cannot move radially during operation under the influence of the centrifugal forces. Radial movability of a cutting blade could not only lead to an accident but would also render the machined product unusable.
In order to be able to utilize the hard metal cutting blades for an extended period of time, it is advantageous if, after some wear of the ground cutting edge, a cutting blade can be remounted with slight radial outward displacement so that, after corresponding regrinding of the cutting edge, the cutting blade can again be used. Also the cutting blades may be reversible blades which, after the cutting edge at one side is worn, can be turned over by 180° so that another cutting edge formed on the opposite, inner side of the cutting blade is then disposed on the outside and, after being firmly mounted in the cutting head, can again be used for cutting.
It is the object of the present invention to provide a mounting arrangement for the secure radial mounting of cutting blades in high speed cutting heads whereby a secure radial positioning of the cutting head is insured, but the cutting blades radial positions are adjustable by at least one step so that, after repositioning, they can be reground and the cutting heads can be reused for another period of operation. Also, the arrangement should be simple and inexpensive to make.
SUMMARY OF THE INVENTION
In a mounting arrangement for supporting, in a stepwise adjustable fashion, a cutting blade in a cutting head for working wood or plastic, the cutting blade has at least one cutting edge and opposite side edges with wave-like profile structures and claw elements are mounted on the cutting head and have engagement portions extending into the troughs of the wave-like profile structures for form-fitting engagement therewith. Each wave-like profile structure has a greater length in the direction of the side edges of the cutting blade than the respective engagement portions of the claw elements so that the position of the cutting blade is adjustable.
In a relatively simple arrangement, the mounting elements can be cylindrical pins which are in engagement with correspondingly formed recesses in the cutting blades. They may also be in the form of claws which have a wave profile along one of the side edges thereof, that is complementary to the wave profile provided on the cutting blades wherein the profile projections of the claws are engaged in the recesses in the cutting blade side edges. The wave profile on the side edges of the cutting blades extends over a wider area then the complementary profile on the mounting elements so that the cutting blades can be adjusted by at least one step, that is, by at least one wave spacing. Preferably, the edge areas of the cutting plate provided with the wave profile are recessed with respect to the rest of the edge of the cutting blade side edge, that is, the cutting blades have cut-outs in their sides and the wave profile is formed on the side walls of the cutouts in the cutting blades.
If the cutting blades are designed as reversable blades the cutouts are provided in the center of the respective side edges of the cutting blade.
The mounting arrangement according to the invention has the advantage that it is easy to manufacture and is absolutely safe in operation. This advantage is particularly noteworthy with regard to arrangements presently in use, wherein the cutting blades include openings into which retaining elements project. Such openings are difficult to form into the hard metal plates and it is particularly difficult to cut such openings with the required accuracy. When such openings are only roughly sized and provided with a plastic filling into which accurately sized openings are cut the engagement surfaces formed thereby are relatively soft so that they may not provide accurate support.
Some embodiments of the invention will be described on the basis of the accompanying drawings.
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Bach Klaus J.
Dexter Clark F.
Hapro-Hartmetall-Profiltechnik GmbH
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