Burr for preparing a homogeneous pulpstone surface

Details Burr for preparing a homogeneous pulpstone surface Burr for preparing a homogeneous pulpstone surface

2005-02-15

2005-02-15

Wilson, Lee D (Department: 3723)

Abrading

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Reexamination Certificate

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06855044

ABSTRACT:
An improved burr for sharpening the grinding surface of a pulpstone includes a novel tooth configuration for better wear of the burr and enhanced grinding properties of the pulpstone. The profile configuration of the burr teeth has a truncated tip portion in the form of a rounded tip portion, a flat tip portion, or an obtusely angled tip portion to avoid a sharply pointed tip. The tip portion connects opposite sides of the tooth, with the sides forming either a symmetrical or an asymmetrical tooth profile using linear, convex involute, and concave involute side configurations. The present invention comprises a further improvement to a pulpstone sharpening burr, wherein the lead angle of the burr teeth changes periodically over the axial length of the burr to provide the pulpstone with a wave-like groove pattern.

REFERENCES:
patent: 994603 (1911-06-01), Potter
patent: 1118671 (1914-11-01), Millard
patent: 1268624 (1918-06-01), Riley
patent: 3608536 (1971-09-01), Roberts, Jr.
patent: 3612413 (1971-10-01), Perry
patent: 3620462 (1971-11-01), Dooley, Jr.
patent: 3734419 (1973-05-01), Cryderman
patent: 3776475 (1973-12-01), Perry
patent: 4595150 (1986-06-01), Aario
patent: 5453041 (1995-09-01), Oliver
patent: 5738569 (1998-04-01), Mackowsky
patent: 6241169 (2001-06-01), Bjorkqvist
patent: 2 092 474 (1982-08-01), None
Norton Canada, “Types of Burrs”, http://www.norton-canada.ca/pulpstone_info/tech_06/sharpen_2.html and sharpen_3.html, Downloaded and printed on Dec. 18, 2000.
F.W. Roberts Manufacturing Co., Inc. Brochure: “Roberts Pulpstone Burrs”, pp. 1-7, Sep., 1973.

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