Abrading – Machine – Rotary tool
Reexamination Certificate
2000-02-25
2001-11-20
Eley, Timothy V. (Department: 3723)
Abrading
Machine
Rotary tool
C451S496000, C451S510000, C451S512000, C409S145000, C409S203000, C409S213000
Reexamination Certificate
active
06319104
ABSTRACT:
BACKGROUND OF THE INVENTION
The following invention relates to a cutting head tool for use with resurfacing or abrading machines which is safe to use and easy to replace.
Conventional resurfacing machines of the type that resurface guide plugs used in the sawmill industry have a pair of opposed upper and lower turntables. The turntables each have a replaceable cutting tool which includes a diamond stylus or the like. A workpiece is fed into the space between the rotary turntables and is resurfaced by the scraping action of the cutting tools. An example of a machine of this type is shown in the Emter U.S. Pat. No. 4,685,845 entitled GUIDE PAD RESURFACING APPARATUS. In this patent each turntable includes a slot which receives a rectangular cutting tool containing a diamond stylus. The tool is held in the slot by a screw, and cutting depth is regulated by an adjustment screw bearing against the tool from the other side of each turntable. The adjustment screw torsions the tool slightly causing it to bend to achieve proper depth.
A problem with this arrangement is that the tool can slip out of the slot because of centrifugal force. In addition although the tool is a wear part, it wears out prematurely because of the bending caused by the torsion screw.
BRIEF SUMMARY OF THE INVENTION
The present invention over comes these problems by providing an abrading tool having a distinct shape that allows it to fit within a pocket in a turntable so that it will not slip out, even under centrifugal forces produced at high speeds. Further the configuration of the tool permits the use of less expensive turntable wheels that spin at higher speeds. The tool may further be adjusted by a torsion screw for cutting depth without causing the metal fatigue so problematic of prior art tools.
The invention provides a tool for use in a resurfacing machine, comprising upper and lower rotary turntables, the turntables including, on an inner surface of each, a cutout pocket having a shape and depth corresponding substantially to the shape and thickness of a cutting tool. The tool comprises a base portion, a shank portion and a head portion, the base portion having a first width, the shank portion being joined to the base portion at a neck and tapering inwardly in width along the shank portion and joining the head portion which is wider than the shank. The head portion has an abrading tip located at approximately an outer radial edge of each turntable.
The shape of the tool and its fit within the pocket assures that the tool will not slip out even at high speeds. The tapering shank distributes the torsion caused by the adjustment screw along the length of the tool so that it does not develop a premature bend.
The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 3817305 (1974-06-01), Gibbs
patent: 3981337 (1976-09-01), Sundstrom
patent: 4009742 (1977-03-01), Ziegelmeyer
patent: 4685845 (1987-08-01), Emter
patent: 4969605 (1990-11-01), Morin
patent: 5524839 (1996-06-01), Schade et al.
patent: 5904306 (1999-05-01), Elliott et al.
patent: 5957176 (1999-09-01), Stein
Chernoff Vilhauer McClung & Stenzel LLP
Eley Timothy V.
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