Patent US5811987A successfully refreshed from Google Patents.
Patent US5127533A successfully refreshed from Google Patents.
US5127533A
Expired / Lapsed
US
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Method of damping the sway of the load of a crane
Assignee: Kone Corp
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Filing: 1990-06-12
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Granted: 1992-07-07
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Expires: 2010-06-12
Abstract
Abstract Procedure for damping the sway of the load (2) moved by the carriage (1) of a crane, said load being suspended on at least one hoisting rope (3). The damping is achieved by using a discrete time control system whose control interval is varied in accordance with the hoisting rope length (L) while the control parameters remain constant.
Inventors
- 👤 Jouko Virkkunen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:33
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/04; B66C13/06; B66C13/063
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A method of damping load sway in a crane having a load suspended on a hoisting cable from a movable carriage comprising: a. determining the length of said cable, said cable varying in length during movement of the moveable carriage; b. controlling the carriage position to a desired position with a transfer function; c. varying the dampening control interval as a function of the length of the cable determined by said step a. to thereby control load sway without requiring transfer function recalculation; and d. repeating said steps a., b. and c. to control carriage position to a desired position while controlling load sway at a frequency determined by the dampening control interval as established by varying the length of said cable.
Claim 2
Independent Claim
122 words
A method of damping load sway in a crane having a load suspended on a hoisting cable from a movable carriage comprising: a. determining the length of said cable, said cable varying in length during movement of the moveable carriage; b. controlling the carriage position to a desired position with a transfer function; c. varying the dampening control interval as a function of the length of the cable determined by said step a. to thereby control load sway without requiring transfer function recalculation; and d. repeating said steps a., b. and c. to control carriage position to a desired position while controlling load sway at a frequency determined by the dampening control interval as established by varying the length of said cable.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein said method develops a single control signal based on said damping control interval, carriage position and the swing angle of the load being controlled by the single control signal.
Claim 4
Dependent Claim
18 words
The method according to claim 2, wherein said transfer function sums the swing angle and the carriage position.
Claim 5
Dependent Claim
33 words
A method according to claim 2, wherein the swing angle and the carriage position are summed by multiplying at least one of the swing angle or the carriage position by a weighting coefficient.
Claim 6
Dependent Claim
23 words
A method according to claim 4, wherein said control interval is proportional to the square root of said determined length of said cable.
Claim 7
Dependent Claim
23 words
A method according to claim 2, wherein said control interval is proportional to the square root of said determined length of said cable.
Claim 8
Dependent Claim
21 words
The method according to claim 2, wherein said damping control interval is determined from only constant parameters and determined cable length.
Claim 9
Dependent Claim
19 words
A method according to claim 7, wherein said constant parameters are preset for a given length of said cable.
Claim 10
Dependent Claim
23 words
A method according to claim 1, wherein said control interval is proportional to the square root of said determined length of said cable.
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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) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |