Patent US3909986A successfully refreshed from Google Patents.
US3909986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for grinding cylindrical workpieces
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1974-04-01
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Granted: 1975-10-07
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Expires: 1994-04-01
Abstract
Abstract An apparatus for continuously grinding a multiplicity of cylindrical workpieces required to be concentrically ground with reference to their axes. The apparatus comprises an upper elastic feed belt adapted to push downwardly and roll the cylindrical workpieces around their axes on a rolling table and a lower grinding belt adapted to be moved at a high rate of speed so as to grind the rolling surfaces of said cylindrical workpieces.
Inventors
- 👤 Shinichi Miyazawa
- 👤 Hidehiko Takeyama
- 👤 Kaneyoshi Miyasaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:49
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
An apparatus for grinding cylindrical workpieces having axially extending shafts on the opposites ends thereof, comprising in combination: an upper platen; a lower platen disposed opposite said upper platen; a grinding belt arranged to run at a high speed over said lower platen; a feed belt arranged to travel under said upper platen, said feed belt producing on said workpieces to be ground a frictional force greater than the force which said grinding belt exerts thereon; a pair of rolling tables disposed respectively along each side of said lower platen to receive said shafts of said workpieces; and means for conveying said workpieces through the opening between said grinding belt and said feed belt, whereby the feed belt causes the shafts of a multiplicity of workpieces to be pressed against and rolled on said rolling tables while the workpieces are being ground to a fixed size by said grinding belt.
Claim 2
Independent Claim
150 words
An apparatus for grinding cylindrical workpieces having axially extending shafts on the opposites ends thereof, comprising in combination: an upper platen; a lower platen disposed opposite said upper platen; a grinding belt arranged to run at a high speed over said lower platen; a feed belt arranged to travel under said upper platen, said feed belt producing on said workpieces to be ground a frictional force greater than the force which said grinding belt exerts thereon; a pair of rolling tables disposed respectively along each side of said lower platen to receive said shafts of said workpieces; and means for conveying said workpieces through the opening between said grinding belt and said feed belt, whereby the feed belt causes the shafts of a multiplicity of workpieces to be pressed against and rolled on said rolling tables while the workpieces are being ground to a fixed size by said grinding belt.
Claim 3
Dependent Claim
28 words
An apparatus according to claim 1, wherein the said opposed platens each comprises an anterior part inclined divergently toward the workpiece receiving side and a posterior parallel part.
Claim 4
Dependent Claim
24 words
An apparatus according to claim 1, wherein the rate of speed of the grinding belt is much greater than that of the feed belt.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |