US3715930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable diameter centrifugally-operated drive pulley
Assignee: Individual
•
Filing: 1971-05-27
•
Granted: 1973-02-13
•
Expires: 1991-05-27
Abstract
Abstract A variable diameter pulley for use as a drive pulley in a V-belt drive assembly in which the axially movable pulley half is moved towards the fixed pulley half under action of centrifugal forces, said centrifugal forces being produced by a liquid filled annular flexible liquid-tight tube disposed in a chamber defined by the axially movable pulley half, a cylindrical wall depending from the periphery thereof and a disc secured to the drive shaft. Rotation of the liquid causes flattening of the tube with increase of rotational speed, thereby displacing the movable pulley half towards the fixed pulley half.
Inventors
- 👤 J Beliveau
- 👤 V Beliveau
- 👤 G Beliveau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:36
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/66231; F16H61/6624
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
350 words
A variable diameter driving pulley for a V-belt drive assembly comprising: a. a rotatable drive shaft; b. a first pulley half secured to said drive shaft and having a tapered wall portion defining one pulley surface; c. a disc secured to said drive shaft and spaced from said first pulley half; d. a second pulley half having a tapered wall portion defining the other pulley surface, said two pulley surfaces adapted to drivingly receive a V-belt therebetween, said second pulley half mounted on said drive shaft intermediate said first pulley half and said disc for axial and rotational movement relative to said drive shaft; e. said disc and second pulley half having opposed spaced surfaces; f. a cylindrical wall secured to the periphery of said second pulley half radially outwardly of said opposed spaced surfaces and telescopically engaged by said disc and defining a chamber with said disc and with said opposed spaced surfaces; g. a compression coil spring surrounding said drive shaft and urging said second pulley half axially away from said first pulley half, said second pulley half having a sleeve-like hub portion surrounding said spring and having a radially outer cylindrical surface provided with longitudinally extending splines, said hub extending towards said disc and being disposed radially inwardly of said opposed spaced surfaces; h. an inwardly splined cylindrical sleeve depending from said disc and extending towards said second pulley half and in telescopic engagement with the splines of said hub portion whereby said second pulley half is rotated by said drive shaft through said disc, said hub portion and said sleeve defining a radially inner wall for said chamber; and i. an annular flexible liquid-proof liquid-containing endless tube located in said chamber and engaging said opposed spaced surfaces and said cylindrical wall; whereby the liquid in said tube produces flattening of said tube against said cylindrical wall under action of centrifugal forces, said tube engaging said surfaces of said second pulley half and of said disc to axially move said second pulley half towards said first pulley half with increasing speed of rotation of said drive shaft.
Claim 2
Dependent Claim
350 words
A variable diameter driving pulley for a V-belt drive assembly comprising: a. a rotatable drive shaft; b. a first pulley half secured to said drive shaft and having a tapered wall portion defining one pulley surface; c. a disc secured to said drive shaft and spaced from said first pulley half; d. a second pulley half having a tapered wall portion defining the other pulley surface, said two pulley surfaces adapted to drivingly receive a V-belt therebetween, said second pulley half mounted on said drive shaft intermediate said first pulley half and said disc for axial and rotational movement relative to said drive shaft; e. said disc and second pulley half having opposed spaced surfaces; f. a cylindrical wall secured to the periphery of said second pulley half radially outwardly of said opposed spaced surfaces and telescopically engaged by said disc and defining a chamber with said disc and with said opposed spaced surfaces; g. a compression coil spring surrounding said drive shaft and urging said second pulley half axially away from said first pulley half, said second pulley half having a sleeve-like hub portion surrounding said spring and having a radially outer cylindrical surface provided with longitudinally extending splines, said hub extending towards said disc and being disposed radially inwardly of said opposed spaced surfaces; h. an inwardly splined cylindrical sleeve depending from said disc and extending towards said second pulley half and in telescopic engagement with the splines of said hub portion whereby said second pulley half is rotated by said drive shaft through said disc, said hub portion and said sleeve defining a radially inner wall for said chamber; and i. an annular flexible liquid-proof liquid-containing endless tube located in said chamber and engaging said opposed spaced surfaces and said cylindrical wall; whereby the liquid in said tube produces flattening of said tube against said cylindrical wall under action of centrifugal forces, said tube engaging said surfaces of said second pulley half and of said disc to axially move said second pulley half towards said first pulley half with increasing speed of rotation of said drive shaft.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |