US4598447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Farrier's file/rasp
Assignee: File Sharpening Co Inc
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Filing: 1985-08-19
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Granted: 1986-07-08
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Expires: 2005-08-19
Abstract
Abstract A file/rasp tool has upstanding teeth with curved cutting edges, arranged in a plurality of rows. The rasp teeth are of generally pyramidal shape and have a cutting face with a positive rake or slope, such cutting face being defined by upwardly converging side edges surmounted by a cutting tip or edge of generally arcuate configuration having a radius of curvature at least equal to the depth of the teeth. The file teeth have cutting edges including a cap portion at the tip of the tooth and extending therefrom at a forward angle to the front face of the tooth. Such tooth configurations provide a tool which has an extended useful life.
Inventors
- 👤 George J. Whyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
B; B23; B23D; B23D71/00; Y; Y10; Y10T; Y10T407/00; Y10T407/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A tool having a rasp surface with a plurality of closely spaced upstanding rasp teeth arranged in a plurality of rows, characterized by each of said rasp teeth having an overall shape which corresponds to a pyramid with a lower corner removed and having a cutting face at the removed lower corner which has a positive face angle and which is defined by upwardly converging side edges surmounted by a sharpened tip of generally arcuate configuration having a radius of curvature at least equal to the depth of the tooth.
Claim 2
Dependent Claim
90 words
A tool having a rasp surface with a plurality of closely spaced upstanding rasp teeth arranged in a plurality of rows, characterized by each of said rasp teeth having an overall shape which corresponds to a pyramid with a lower corner removed and having a cutting face at the removed lower corner which has a positive face angle and which is defined by upwardly converging side edges surmounted by a sharpened tip of generally arcuate configuration having a radius of curvature at least equal to the depth of the tooth.
Claim 3
Dependent Claim
24 words
A tool as defined in claim 1, wherein said face angle of said rasp teeth is in the order of 10 to 15 degrees.
Claim 4
Dependent Claim
27 words
A tool as defined in claim 2, wherein the rise of said rasp teeth from said rasp surface is in the order of 1.44 to 1.70 mm.
Claim 5
Dependent Claim
42 words
A tool as defined in claim 1, also including a file surface characterized by file teeth including a cap portion at the tip of each tooth and extending therefrom at an angle greater than the front face angle of said file teeth.
Claim 6
Dependent Claim
25 words
A tool as defined in claim 4, wherein said cap portions are generally arcuate, extending one from another across said file surface in spaced rows.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |