US3784166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level wind drum
Assignee: TERRA MARINE SCOOP CO Inc
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Filing: 1971-12-01
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Granted: 1974-01-08
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Expires: 1991-12-01
Abstract
Abstract A drum for hoist, winches, pullers, and the like having a substantially cylindrical member provided with longitudinally spaced end portions and a winding surface having a diameter at a point at each end portion which is less than the diameter at a point substantially equidistant between the end portions for permitting a level wind action onto the drum of a line passing through a fairlead or sheave assembly.
Inventors
- 👤 W Renfroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:48
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/28; B66D1/30; B65; B65H; B65H75/00; B65H75/02; B65H75/04; B65H75/08; B65H75/14; B65H2701/00; B65H2701/50; B65H2701/51; B65H2701/512; B65H2701/5124
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
The combination of a line winding drum, a line having a longitudinal extent and attached to the drum for winding thereon, and a guide sheave assembly spaced from the drum a distande less than the distance necessary to provide a normal fleet angle for the line between the sheave assembly and drum, said drum comprising a substantially cylindrical member of substantially circular cross-section forming a winding surface and provided with spaced end portions, the diameter of the rotary member being slightly greater at its central portion than at its end portions and forming a means for keeping the winding surface essentially perpendicular to the longitudinal extent of the line and enabling the drum and sheave assembly to be relatively closely spaced to one another while maintaining level winding of the line onto the drum by increasing the fleet angle.
Claim 2
Dependent Claim
139 words
The combination of a line winding drum, a line having a longitudinal extent and attached to the drum for winding thereon, and a guide sheave assembly spaced from the drum a distande less than the distance necessary to provide a normal fleet angle for the line between the sheave assembly and drum, said drum comprising a substantially cylindrical member of substantially circular cross-section forming a winding surface and provided with spaced end portions, the diameter of the rotary member being slightly greater at its central portion than at its end portions and forming a means for keeping the winding surface essentially perpendicular to the longitudinal extent of the line and enabling the drum and sheave assembly to be relatively closely spaced to one another while maintaining level winding of the line onto the drum by increasing the fleet angle.
Claim 3
Dependent Claim
52 words
A structure as defined in claim 1, wherein said end portions include flanges dimensioned for permitting the storage of sufficient rope on the drum to extend to above average distances, and the drum is further provided with bore means including a hub portion and recesses for mounting the drum on a shaft.
Claim 4
Dependent Claim
50 words
A structure as defined in claim 2, wherein said cylindrical member has a longitudinal axis passing through the end portions, and said winding surface extends linearly from each end portion at an angle in the range of 2* to 3* with respect to the longitudinal axis of the cylindrical member.
Claim 5
Dependent Claim
41 words
A structure as defined in claim 2, wherein said winding surface is curved convexly along a radius equal to the distance from a point on the winding surface equidistant between the end portions to an axis of rotation of the sheave.
Claim 6
Dependent Claim
50 words
A structure as defined in claim 1, wherein said cylindrical member has a longitudinal axis passing through the end portion, and said winding surface extends linearly from each end portion at an angle in the range of 2* to 3* with respect to the longitudinal axis of the cylindrical member.
Claim 7
Dependent Claim
41 words
A structure as defined in claim 1, wherein said winding surface is curved convexly along a radius equal to the distance from a point on the winding surface equidistant between the end portions to an axis of rotation of the sheave.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |