US3893249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suction dredger with swell compensation
Assignee: Individual
•
Filing: 1974-01-30
•
Granted: 1975-07-08
•
Expires: 1994-01-30
Abstract
Abstract The tension load on the cable suspending the nozzle and conduit of a suction dredger is reduced by employing one or more reversing sheaves at the nozzle with multiple cable passes thereover. In order to ''''sling'''' the nozzle end pulleys or sheaves and avoid movement between the slinging cable portions and the nozzle end pulleys as swell compensation is effected, the slinging pairs of cable portions are guided and maintained sideby-side and are acted upon in unison by the swell compensation device.
Inventors
- 👤 Tjako Aaldrik Wolters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:19
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/06; E02F9/067
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
230 words
In a suction dredger system comprising a buoyant vessel, and a suction dredger mounted on said vessel and including an elongate suction conduit terminating in a suction nozzle, the combination of: a cable suspension system for suspending said nozzle from said vessel while the suction nozzle is inserted in the bottom below the vessel, said cable suspension system including at least one winch on said vessel, a cable wound on said winch and issuing therefrom, a reversing pulley connected to said suction nozzle whereby such reversing pulley is subject to an environment which is inherently dirty during dredging operation, said cable being trained over said reversing pulley and secured to said vessel whereby to present at least two cable portions extending from said vessel to said reversing pulley, guide pulley means carried by said vessel and over which said cable portions are trained to suspend said suction nozzle, further guide pulley means on said vessel for guiding and maintaining said cable portions in side-by-side relation; and swell compensation means, engaging said cable portions which are maintained in side-by-side relation by said further guide pulley means, for paying out and taking in said cable Portions in unison as said vessel rises and falls due to wave action, whereby to move said cable relative to said guide pulley means only while obviating any significant movement of the cable over said reversing pulley.
Claim 2
Dependent Claim
230 words
In a suction dredger system comprising a buoyant vessel, and a suction dredger mounted on said vessel and including an elongate suction conduit terminating in a suction nozzle, the combination of: a cable suspension system for suspending said nozzle from said vessel while the suction nozzle is inserted in the bottom below the vessel, said cable suspension system including at least one winch on said vessel, a cable wound on said winch and issuing therefrom, a reversing pulley connected to said suction nozzle whereby such reversing pulley is subject to an environment which is inherently dirty during dredging operation, said cable being trained over said reversing pulley and secured to said vessel whereby to present at least two cable portions extending from said vessel to said reversing pulley, guide pulley means carried by said vessel and over which said cable portions are trained to suspend said suction nozzle, further guide pulley means on said vessel for guiding and maintaining said cable portions in side-by-side relation; and swell compensation means, engaging said cable portions which are maintained in side-by-side relation by said further guide pulley means, for paying out and taking in said cable Portions in unison as said vessel rises and falls due to wave action, whereby to move said cable relative to said guide pulley means only while obviating any significant movement of the cable over said reversing pulley.
Claim 3
Dependent Claim
129 words
In a suction dredger system as defined in claim 1 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel, said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.
Claim 4
Dependent Claim
56 words
In a suction dredger system as defined in claim 2 including a third reversing pulley on said nozzle and a second reversing pulley on said vessel, over both of which said cable is passed to form three pairs of cable portions all of which are engaged by said swell compensation means for movement in unison thereby.
Claim 5
Dependent Claim
30 words
In a suction dredger system as defined in claim 1 wherein said further guide pulley means comprises two sets of pulleys, one on either side of said swell compensation means.
Claim 6
Dependent Claim
129 words
In a suction dredger system as defined in claim 4 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel, said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.
Claim 7
Dependent Claim
56 words
In a suction dredger system as defined in claim 5 including a third reversing pulley on said nozzle and a second reversing pulley on said vessel, over both of which said cable is passed to form three pairs of cable portions all of which are engaged by said swell compensation means for movement in unison thereby.
Claim 8
Dependent Claim
23 words
In a suction dredger system as defined in claim 1 including a second winch on said vessel with which said cable is engaged.
Claim 9
Dependent Claim
30 words
In a suction dredger system as defined in claim 7 wherein said further guide pulley means comprises two sets of pulleys, one on either side of said swell compensation means.
Claim 10
Dependent Claim
129 words
In a suction dredger system as defined in claim 8 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel, said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.
Claim 11
Dependent Claim
56 words
In a suction dredger system as defined in claim 9 including a third reversing pulley on said nozzle and a second reversing pulley on said vessel, over both of which said cable is passed to form three pairs of cable portions all of which are engaged by said swell compensation means for movement in unison thereby.
Claim 12
Dependent Claim
129 words
In a suction dredger system as defined in claim 7 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel, said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.
Claim 13
Dependent Claim
56 words
In a suction dredger system as defined in claim 11 including a third reversing pulley on said nozzle and a second reversing pulley on said vessel, over both of which said cable is passed to form three pairs of cable portions all of which are engaged by said swell compensation means for movement in unison thereby.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |