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Patent US3608394A successfully refreshed from Google Patents.
US3608394A
Expired / Lapsed
US
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Double-throated worm gearing
Assignee: Hasegawa Haguruma Tekkosho KK
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Filing: 1970-02-04
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Granted: 1971-09-28
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Expires: 1990-02-04
Abstract
Abstract A DOUBLE-THROATED WORM GEARING HAVING AN INCREASED LOAD-CARRYING CAPACITY AND AN IMPROVED TRANSMISSION EFFICIENCY. THE WORM GEARS CAN BE PRODUCED BY A GENERATING METHOD IN A CONTINUOUS FASHION WITH INCREASED EFFICIENCY. PARTICULARLY, THE THROATED WORM WHEEL HAS TOOTH SURFACES EACH INCLUDING A CURVED CONTACTING ZONE EFFECTIVELY ENGAGEABLE WITH THE MATING THROATED WORM IN ADDITION TO A PLANAR CONTACTING ZONE CORRESPONDING TO A PORTION OF THE PLANAR TOOTH SURFACE OF CONVENTIONAL FORMS OF THROATED WORM WHEEL.
Inventors
- 👤 Shoichi Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:14
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/22; B; B23; B23F; B23F13/00; B23F13/06; B23F13/08; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19828; Y10T74/19949; Y10T74/19953
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |