US3863774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skyline carriage
Assignee: Weyerhaeuser Co
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Filing: 1974-03-18
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Granted: 1975-02-04
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Expires: 1994-03-18
Abstract
Abstract A pair of opposed sheaves are mounted towards the top of the skyline carriage, such that the carriage can move along a suspended skyline cable. Extending through the carriage beneath the pair of sheaves is a haul-back cable, one end of which runs to a yarding drum while the other end is connected to the mainline cable. The mainline cable runs from the mainline yarding drum through the carriage and over a sheave within the carriage that allows the bottom portion of the mainline to extend downwardly toward the ground. A clamping system within the carriage and actuated through tension control on the cables acts to clamp and release the skyline cable and the haul-back cable, depending on the mode of operation desired.
Inventors
- 👤 Dennis L Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:38
CPC Classifications
B; B66; B66C; B66C21/00; A; A01; A01G; A01G23/00; A01G23/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
262 words
A skyline carriage of the type with first and second sides and a bottom adapted to traverse a skyline cable and having mainline and haulback cables in operative communication therewith together with means to independently actuate said mainline and haulback cables with the improvement comprising: means within the carriage to direct the mainline cale from its entry point at the first side of said carriage to the bottom thereof such that a portion of said mainline cable extends downwardly from the bottom of said carriage, means to direct the haulback cable from its entry point at the second side of said carriage toward said first side, means to join the end of said haulback cable to said mainline cable at a position which is above said mainline cable directing means and generally in the same plane therewith, and a locking mechanism for sequentially locking and unlocking said carriage to said skyline cable and to said haul-back cable comprising: means to sense a vertical position of the downwardly extending portion of said mainline cable, first means responsive to said sensing means to lock the carriage to the hualback cable and to substantially simultaneously unlock the carriage fRom said skyline cable when the downwardly extending portion of the mainline cable is substantially in its uppermost position, and second means responsive to said sensing means to lock the carriage to the skyline cable and to substantially simultaneously unlock the carriage from said haulback cable when the downwardly extending portion of the mainline cable is in a lower vertical position with respect to its uppermost position.
Claim 2
Dependent Claim
262 words
A skyline carriage of the type with first and second sides and a bottom adapted to traverse a skyline cable and having mainline and haulback cables in operative communication therewith together with means to independently actuate said mainline and haulback cables with the improvement comprising: means within the carriage to direct the mainline cale from its entry point at the first side of said carriage to the bottom thereof such that a portion of said mainline cable extends downwardly from the bottom of said carriage, means to direct the haulback cable from its entry point at the second side of said carriage toward said first side, means to join the end of said haulback cable to said mainline cable at a position which is above said mainline cable directing means and generally in the same plane therewith, and a locking mechanism for sequentially locking and unlocking said carriage to said skyline cable and to said haul-back cable comprising: means to sense a vertical position of the downwardly extending portion of said mainline cable, first means responsive to said sensing means to lock the carriage to the hualback cable and to substantially simultaneously unlock the carriage fRom said skyline cable when the downwardly extending portion of the mainline cable is substantially in its uppermost position, and second means responsive to said sensing means to lock the carriage to the skyline cable and to substantially simultaneously unlock the carriage from said haulback cable when the downwardly extending portion of the mainline cable is in a lower vertical position with respect to its uppermost position.
Claim 3
Dependent Claim
46 words
The skyline carriage as in claim 1 in which the sensing means is comprised of a clamp fixed to said mainline cable at a position at the beginning of said downwardly extending portion and a vertically moveable plate member positioned at the bottom of said carriage.
Claim 4
Dependent Claim
47 words
The skyline carriage as in claim 2 in which said first and second means is comprised of haulback and skyline clamping mechanisms in operative communication with each other through a linkage mechanism which are adapted to open and close respectively depending on the position of said clamp.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |