Patent US4417718A successfully refreshed from Google Patents.
US4417718A
Expired / Lapsed
US
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Counter balanced sheave assembly with multiple pulleys
Assignee: Individual
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Filing: 1981-10-22
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Granted: 1983-11-29
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Expires: 2001-10-22
Abstract
Abstract Disclosed is a counter-balanced sheave assembly for supporting a cable comprising a plurality of sheaves mounted in an arcuate path on a support frame; counter-balancing weights positioned above the support frame and rigidly connected thereto; and a suspension arrangement, connected at the center of the assembly, for providing rotation of the assembly about two perpendicular axes of rotation, whereby the cable stays within a plane defined by the arcuate path.
Inventors
- 👤 Shale J. Niskin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:42
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/28; B66D1/36; B66D3/00; B66D3/04; B66D3/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
179 words
A counter-balanced sheave assembly for supporting a downward extending cable having a tension applied thereto, comprising: a support frame; a plurality of sheaves rotatably mounted to said support frame along a downwardly facing, arcuate path with their axis of rotation being substantially perpendicular to a plane containing said arcuate path; counter-balancing means positioned above said support frame; connecting means disposed between said counter-balancing means and said support frame for rigidly interconnecting the same; suspension means pivotally connected to said connecting means with its pivotal axis being substantially parallel to said plane containing said arcuate path; said suspension means including a first rotatable member, having said pivot axis, rotatably mounted at its ends to said connecting means, and a second rotatable member pivotally secured to said first rotatable member with its rotation axis being substantially perpendicular to said pivot axis of said first rotatable member, said second rotatable member being operable for supporting said counter-balanced sheave assembly; whereby said plane containing said arcuate path at all times approximately passes through and lies parallel with the cable positioned over said sheaves.
Claim 2
Dependent Claim
179 words
A counter-balanced sheave assembly for supporting a downward extending cable having a tension applied thereto, comprising: a support frame; a plurality of sheaves rotatably mounted to said support frame along a downwardly facing, arcuate path with their axis of rotation being substantially perpendicular to a plane containing said arcuate path; counter-balancing means positioned above said support frame; connecting means disposed between said counter-balancing means and said support frame for rigidly interconnecting the same; suspension means pivotally connected to said connecting means with its pivotal axis being substantially parallel to said plane containing said arcuate path; said suspension means including a first rotatable member, having said pivot axis, rotatably mounted at its ends to said connecting means, and a second rotatable member pivotally secured to said first rotatable member with its rotation axis being substantially perpendicular to said pivot axis of said first rotatable member, said second rotatable member being operable for supporting said counter-balanced sheave assembly; whereby said plane containing said arcuate path at all times approximately passes through and lies parallel with the cable positioned over said sheaves.
Claim 3
Dependent Claim
44 words
The counter-balanced sheave of claim 1, wherein said support frame defines an upwardly-facing trough having opposed sidewalls, each said sheave being rotatably mounted in traversing relationship between said sidewalls with said sidewalls extending above said sheaves, whereby said sidewalls guide and contain the cable.
Claim 4
Dependent Claim
26 words
The counter-balanced sheave of claim 2, wherein said counter-balance means comprises a pair of substantially equal weighted members mounted on opposite sides of said suspension means.
Claim 5
Dependent Claim
35 words
The counter-balanced sheave of claim 3, wherein said connecting means includes a pair of side frames extending downward to connect with said support frame to hold it rigidly in place relative to said connecting means.
Claim 6
Dependent Claim
21 words
The counter-balanced sheave of claim 4, wherein said first rotating member is rotatably mounted in traversing relationship between said side frames.
Claim 7
Dependent Claim
25 words
The counter-balanced sheave of claim 5, wherein said side frames each include an upwardly extending weight holder arm connected to one of said weight members.
Claim 8
Dependent Claim
159 words
A counter-balanced sheave assembly for supporting a downward extending cable having a tension applied thereto, comprising: a support frame; a plurality of sheaves rotatably mounted to said support frame along a downwardly facing arcuate path in a single plane; counter-balancing means positioned above said support frame and rigidly interconnected with said support frame; suspension means for pivotally mounting said assembly in the proximity of its balance center so that said assembly can rotate about two substantially perpendicular axis; said suspension means including a first rotatable member, having said pivot axis, rotatably mounted at its ends to said connecting means, and a second rotatable member pivotally secured to said first rotatable member with its rotation axis being substantially perpendicular to said pivot axis of said first rotatable member, said second rotatable member being operable for supporting said counter-balanced sheave assembly; whereby the plane of said arcuate path approximately passes through and lies parallel with the cable positioned over said sheaves.
Claim 9
Dependent Claim
159 words
A counter-balanced sheave assembly for supporting a downward extending cable having a tension applied thereto, comprising: a support frame; a plurality of sheaves rotatably mounted to said support frame along a downwardly facing arcuate path in a single plane; counter-balancing means positioned above said support frame and rigidly interconnected with said support frame; suspension means for pivotally mounting said assembly in the proximity of its balance center so that said assembly can rotate about two substantially perpendicular axis; said suspension means including a first rotatable member, having said pivot axis, rotatably mounted at its ends to said connecting means, and a second rotatable member pivotally secured to said first rotatable member with its rotation axis being substantially perpendicular to said pivot axis of said first rotatable member, said second rotatable member being operable for supporting said counter-balanced sheave assembly; whereby the plane of said arcuate path approximately passes through and lies parallel with the cable positioned over said sheaves.
Claim 10
Dependent Claim
25 words
The counter-balanced sheave assembly of claim 7, wherein the axes of rotation of said sheaves are substantially perpendicular to said plane of said arcuate path.
References Cited (Backward Citations)
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US1968321A
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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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |