Patent US3579872A successfully refreshed from Google Patents.
US3579872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dredging apparatus with surge compensating means
Assignee: Ocean Science and Engineering Inc
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Filing: 1968-11-05
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Granted: 1971-05-25
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Expires: 1988-11-05
Abstract
Abstract A dredging system including a floating vessel, a ladder pivotally connected to the vessel and capable of being lowered to selected angular positions with respect to the vessel, an excavator at the free end of the ladder for digging and removing material, and a surge compensator on the ladder for adjusting the length of the ladder in response to changes in distance between the vessel and the material being dredged.
Inventors
- 👤 Robert J Jantzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:01
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9212; E02F3/905; E02F9/00; E02F9/06; E02F9/067
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
Apparatus for dredging material from the bed beneath a body of water comprising: a vessel floating on said body of water; an elongated ladder, said ladder comprising a first ladder section having an inner end pivotally connected to said vessel and having an outer end extending over the water; a second ladder section offset from and parallel to said first ladder section; connection means pivotally connecting said second ladder section to said outer end for parallel, Lineal displacement of said second ladder section with respect to said first ladder section; supporting means connected to said first ladder section between said inner end and said outer end for positioning said ladder at a selected angular position with respect to said vessel; excavating means carried by said second ladder section for digging and removing material from said bed; and control means for adjusting the effective combined length of said ladder by lineally displacing said second ladder section with respect to said first ladder section.
Claim 2
Dependent Claim
162 words
Apparatus for dredging material from the bed beneath a body of water comprising: a vessel floating on said body of water; an elongated ladder, said ladder comprising a first ladder section having an inner end pivotally connected to said vessel and having an outer end extending over the water; a second ladder section offset from and parallel to said first ladder section; connection means pivotally connecting said second ladder section to said outer end for parallel, Lineal displacement of said second ladder section with respect to said first ladder section; supporting means connected to said first ladder section between said inner end and said outer end for positioning said ladder at a selected angular position with respect to said vessel; excavating means carried by said second ladder section for digging and removing material from said bed; and control means for adjusting the effective combined length of said ladder by lineally displacing said second ladder section with respect to said first ladder section.
Claim 3
Dependent Claim
41 words
The invention of claim 1 wherein said excavating means comprises rotatable bucket means for loosening and capturing material from said bed, and suction pipe means supported on said first and second ladder sections for removing said material from said bucket means.
Claim 4
Dependent Claim
32 words
The invention of claim 2 wherein flexible means intermediate the length of said suction pipe means permits said pipe means to follow the relative movements between said first and second ladder sections.
Claim 5
Dependent Claim
36 words
The invention as described in claim 2 wherein said rotatable bucket means comprises a plurality of buckets open at their inner ends and rotatably disposed to successively present said inner ends to said suction pipe means.
Claim 6
Dependent Claim
65 words
The invention as described in claim 4 wherein said suction pipe means is supported on said ladder and comprises a plurality of pipe sections connected together and extending from said vessel to a point adjacent the line of travel circumscribed by the inner end of said buckets, said pipe sections extending the length of said ladder and being pivotally and telescopically disposed for movement therewith.
Claim 7
Dependent Claim
34 words
The invention of claim 1 wherein said connection means comprises a pair of parallel struts pivotally connected at each end to said outer end and said second ladder section and forming a parallelogram therewith.
Claim 8
Dependent Claim
62 words
The invention of claim 6 wherein said control means comprises a cable between a pair of diagonally opposite corners of said parallelogram, means to apply a force on said cable to draw said corners toward one another to thus urge collapse of the parallelogram structure and consequent extension of the ladder, and biasing means for urging said corners away from each other.
Claim 9
Dependent Claim
34 words
The invention as described in claim 1 wherein said supporting means comprises a framework on said vessel, sheave and cable means connected between said framework and said ladder for raising and lowering said ladder.
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |