US3220702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction drives for devices such as scraper hoists
Assignee: DAVID BROWN PREC EQUIPMENT PRO
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Filing: 1964-02-24
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Granted: 1965-11-30
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Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 Colin C Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:11
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/60; B66D1/80; B66D1/02; B66D1/14; B66D1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A WINCH DEVICE CONSISTING IN A WINDING DRUM, A ROTATABLE SHAFT ON WHICH THE DRUM IS MOUNTED WITH A FREE FIT, AND TWO DISCS CENCENTRIC WITH THE DRUM, THE DRUM BEING ADAPTED TO BE CLAMPED BETWEEN THE DISCS, THE FIRST DISC BEING A SLIDE FIT ON THE SHAFT AND KEYED FOR ROTATION WITH THE SHAFT AND THE SECOND DISC BEING FIXED ON THE SHAFT, IN WHICH THE SHAFT PROJECTS BEYOND THE FIRST DISC, A CYLINDRICAL BORE IS FORMED IN THE PROJECTING PART OF THE SHAFT, A PISTON OCCUPIES THE CYLINDERICAL BORE, THE WALL THE CYLINDRICAL BORE IS FORMED WITH TWO OPPOSED REGISTERING SLOTS ADJACENT TO THE FIRST DISC, A TRANSVERSE MEMBER EXTENDS THROUGH THE SLOTS, THE PISTON ACTING UPON THE TRANSVERSE MEMBER AND THE ENDS OF THE TRANVERSE MEMBER ACTING UPON THE FIRST DISC, AND END CLOSURE TO THE CYLINDRICAL BORE THROUGH WHICH END CLOSURE HYDRAULIC FLUID IS ADAPTED TO BE FED TO THE SPACE BETWEEN THE END CLOSURE AND THE PISTON, AND RESILIENT MEANS ACTING BETWEEN THE TRANSVERSE MEMBER AND THE PISTON BIASING THE FIRST DISC TO EXERT A PREDETERMINED DRAG ON THE DRUM.
Claim 2
Dependent Claim
185 words
A WINCH DEVICE CONSISTING IN A WINDING DRUM, A ROTATABLE SHAFT ON WHICH THE DRUM IS MOUNTED WITH A FREE FIT, AND TWO DISCS CENCENTRIC WITH THE DRUM, THE DRUM BEING ADAPTED TO BE CLAMPED BETWEEN THE DISCS, THE FIRST DISC BEING A SLIDE FIT ON THE SHAFT AND KEYED FOR ROTATION WITH THE SHAFT AND THE SECOND DISC BEING FIXED ON THE SHAFT, IN WHICH THE SHAFT PROJECTS BEYOND THE FIRST DISC, A CYLINDRICAL BORE IS FORMED IN THE PROJECTING PART OF THE SHAFT, A PISTON OCCUPIES THE CYLINDERICAL BORE, THE WALL THE CYLINDRICAL BORE IS FORMED WITH TWO OPPOSED REGISTERING SLOTS ADJACENT TO THE FIRST DISC, A TRANSVERSE MEMBER EXTENDS THROUGH THE SLOTS, THE PISTON ACTING UPON THE TRANSVERSE MEMBER AND THE ENDS OF THE TRANVERSE MEMBER ACTING UPON THE FIRST DISC, AND END CLOSURE TO THE CYLINDRICAL BORE THROUGH WHICH END CLOSURE HYDRAULIC FLUID IS ADAPTED TO BE FED TO THE SPACE BETWEEN THE END CLOSURE AND THE PISTON, AND RESILIENT MEANS ACTING BETWEEN THE TRANSVERSE MEMBER AND THE PISTON BIASING THE FIRST DISC TO EXERT A PREDETERMINED DRAG ON THE DRUM.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |