US3961449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine for household use
Assignee: Ise Kogyo KK
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Filing: 1975-08-27
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Granted: 1976-06-08
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Expires: 1995-08-27
Abstract
Abstract Grinding machine comprising a rotary shaft vertically supportd by a housing, a whetstone mounted on the upper end of the shaft and having a top surface serving as a grinding surface, means for rotating the shaft by the pressure of tap water to rotate the whetstone at a high speed, water supply means for supplying water to the grinding surface at a suitable rate to form a layer of water thereon during the rotation of the whetstone and urging means for raising the shaft by the tap water pressure to urge the whetstone upward. The whetstone is upwardly urged to automatically control the grinding pressure on the article to be sharpened which is pressed against the grinding surface, while water is applied to the grinding surface at a suitable rate.
Inventors
- 👤 Minoru Ise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:18
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
238 words
A grinding machine for household use comprising: a rotary shaft vertically supported by an upper bearing and a lower bearing mounted on a housing, the rotary shaft having a small water passage extending vertically therethrough, a whetstone mounted on the upper end of the rotary shaft and disposed above the housing, the whetstone having a top surface serving as a grinding surface, drive means for rotating the whetstone along with the rotary shaft at a high speed by the pressure of tap water, the drive means including a uniform pressure chamber for receiving the tap water and adapted to maintain its internal pressure at as uniform a level as possible, nozzles formed in the periphery of the chamber and an impeller mounted on the rotary shaft and rotatable by the water forced out from the nozzles against the impeller, a water supply member including means for fastening the whetstone to the rotary shaft and having a T-shaped water channel communicating with the water passage of rotary shaft to form a water layer on the grinding surface during the rotation of the whetstone, and urging means for applying the pressure of water in the uniform pressure chamber to the lower end of the rotary shaft supported by the lower bearing to raise the whetstone along with the shaft and for supplying water to the water channel of the water supply member through the water passage of the rotary shaft.
Claim 2
Dependent Claim
238 words
A grinding machine for household use comprising: a rotary shaft vertically supported by an upper bearing and a lower bearing mounted on a housing, the rotary shaft having a small water passage extending vertically therethrough, a whetstone mounted on the upper end of the rotary shaft and disposed above the housing, the whetstone having a top surface serving as a grinding surface, drive means for rotating the whetstone along with the rotary shaft at a high speed by the pressure of tap water, the drive means including a uniform pressure chamber for receiving the tap water and adapted to maintain its internal pressure at as uniform a level as possible, nozzles formed in the periphery of the chamber and an impeller mounted on the rotary shaft and rotatable by the water forced out from the nozzles against the impeller, a water supply member including means for fastening the whetstone to the rotary shaft and having a T-shaped water channel communicating with the water passage of rotary shaft to form a water layer on the grinding surface during the rotation of the whetstone, and urging means for applying the pressure of water in the uniform pressure chamber to the lower end of the rotary shaft supported by the lower bearing to raise the whetstone along with the shaft and for supplying water to the water channel of the water supply member through the water passage of the rotary shaft.
Claim 3
Dependent Claim
89 words
A grinding machine as defined in claim 1 wherein the urging means includes a hole for permitting the uniform pressure chamber to communicate with the interior of the lower bearing and a seat disposed on the inner bottom of the lower bearing and upwardly movable by the pressure of water in the uniform pressure chamber to bring the interior space of the lower bearing into communication with the hole and to cause the water pressure of the chamber to act on the lower end surface of the rotary shaft.
Claim 4
Dependent Claim
68 words
A grinding machine as defined in claim 1 wherein the urging means includes a hole for permitting the uniform pressure chamber to communicate with the interior of the lower bearing and a hollow cylindrical seat loosely fitting around the lower end of the rotary shaft and disposed in the lower bearing with a suitable clearance formed between the seat and the inner peripheral surface of the lower bearing.
Claim 5
Dependent Claim
73 words
A grinding machine as defined in claim 1 wherein the urging means includes a hole for permitting the uniform pressure chamber to communicate with the interior of the lower bearing and a dishlike seat vertically slidably fitting in the lower bearing and having a bore extending therethrough at its center, the seat having a dishlike concave surface in contact with the lower end surface of the rotary shaft which end surface is semispherical.
Claim 6
Dependent Claim
31 words
A grinding machine as defined in claim 1 wherein a cutlery support surrounding the whetstone and having a suitably inclined upper end surface is mounted on the top of the housing.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |