US3778070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary shaft air-tightly fitting device
Assignee: Rigaku Denki Co Ltd
•
Filing: 1972-02-24
•
Granted: 1973-12-11
•
Expires: 1992-02-24
Abstract
Abstract This invention relates to a device for air-tightly fitting a rotary shaft, for example, for an anode in a rotary opposite cathode X-ray tube whereby it is made possible to remarkably elongate the life of each packing by reducing the wear of the packing without causing a leakage by reducing the pressing contact force of the packing with a centrifugal force.
Inventors
- 👤 Y Shimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:04
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/40; F16J15/406; F16J15/164; F16J15/34; F16J15/3436; F16J15/3456; H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/101; H01J35/1017; H01J35/1024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A rotary shaft air-tightly fitting device which comprises an air-tight wall, a rotary shaft closely fitted and passed through said air-tight wall, a spiral concave groove made on the peripheral side surface of said rotary shaft in the passing part of the rotary shaft and two annular packings arranged respectively at boty ends of said spiral concave groove and opposed on the outsides respectively to the atmosphere and the air-tight chamber, said first annular packing opposed to the above mentioned air-tight chamber being fixed to the above mentioned rotary shaft and pressed on the outside surface into contact with the above mentioned air-tight wall, the space between the above mentioned Two packings being filled with an oil low in the viscosity and the oil between said second annular packing opposed to the atmosphere and the above mentioned spiral concave groove being connected with the atmosphere.
Claim 2
Dependent Claim
145 words
A rotary shaft air-tightly fitting device which comprises an air-tight wall, a rotary shaft closely fitted and passed through said air-tight wall, a spiral concave groove made on the peripheral side surface of said rotary shaft in the passing part of the rotary shaft and two annular packings arranged respectively at boty ends of said spiral concave groove and opposed on the outsides respectively to the atmosphere and the air-tight chamber, said first annular packing opposed to the above mentioned air-tight chamber being fixed to the above mentioned rotary shaft and pressed on the outside surface into contact with the above mentioned air-tight wall, the space between the above mentioned Two packings being filled with an oil low in the viscosity and the oil between said second annular packing opposed to the atmosphere and the above mentioned spiral concave groove being connected with the atmosphere.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |