CA1130826A - Dredging vessel - Google Patents
Dredging vesselInfo
- Publication number
- CA1130826A CA1130826A CA352,831A CA352831A CA1130826A CA 1130826 A CA1130826 A CA 1130826A CA 352831 A CA352831 A CA 352831A CA 1130826 A CA1130826 A CA 1130826A
- Authority
- CA
- Canada
- Prior art keywords
- lower body
- dredging vessel
- dredging
- vessel
- distal end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/905—Manipulating or supporting suction pipes or ladders; Mechanical supports or floaters therefor; pipe joints for suction pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/06—Floating substructures as supports
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
- Toys (AREA)
Abstract
Abstract of the Disclosure A dredging vessel of which an elongated lower hull part has its fore end pivotally attached to the forepart of the vessel and its rear end suspended in a hanger abaft so as to be rearwardly and downwardly inclined and extend a cutter or excavator on a ladder mounted on said rear end to a deep sea bottom.
Description
1~3~826 Background of ~he Invention This invention relates to a dredging vessel, provided with a ladder to extend a dredge to be moved along a track.
A dredging vessel of that type can extend its dredge consisting of a rotary cutter ~r an excavator wheel to which a suction tube is connected, down to a depth of 30 meters, but often dredging operations in deeper water are to b~ performed.
; ~:
Summary of the Invention ~he present in~-ention has as its object to fulfil this requirement and achieves this cue to the aspect that the dredging vessel so as to be - adapted to be used as well on a track on a deep bottom is constructed of - an upper body ~nd a lower body which supports the ladder, and when emptied ~-' floats up to below the upper body, and when ballasted sin~s down so as to extend the ladc`er down to the deep bottom. This sinking down is made possible by a ~ivot joint between the upper and lower bodies in the fore- ;
ship and a hancer tackle therebetween in the aftship, with the further aspect that the upper body is arranged as an engine pontoon and carries the upper mud line system whereas the lower body carries the lower mud line system, s~;d two line systems being adapted to be coupled at the pivot joint between the upper and lower bodies.
It will thus be possible to dredge down to a depth of 100 meters-' On the deeply ~ bmerged parts of the lower body a high pressure from all i~ ~
' ' : ! : , :
~3~8Z6 s~de~ wlll he exert~d and thia pres6ure can be taken a~ the lower body consistq of a pontoon, having ln it~ deeply submerslble paxts a pres~ure-reslstant citadel, and the lower body can take the lncreaslng pres~ure at gr~ater depths as the cyllndrlcal pres~ure hull deflning the cltadel consl~t~
oP sectlon~ deflned by transver~e ~ulkhead~, the dlameter o~ whlch 18 reduced tow~rds more deeply sub~erslble pArts, ~o that wlth equal thlckne~
- of the pressure hull it~ pressure a~rength at greater depths gradually lncreases.
The hereln disclo3ed d~epsea suction cutter dredger 13 further characterized ln that the forepart of the lowor body when thl~ lower body sinks down plvots up to above the water and gives acce~s to the lower kody, and in that ln the rear part of the lcwer body a quick d~n~t~nk to be emptled and ballasted ls arranged. There can be a constant balance between the b~oyancy of the pres~ure-resl~tant core and the welght of the - for the remalnder flooded - pontoon, of which the lower body conslsts, and sinklng down, and flo-tlng up, respectlvely, 1~ controlled by the small qulck divlng tank in the rear~hip o~ sald lowar pontoon, ~ald tank only having to provide a small ~orce to exert a momantladapted for floating up or sink ng down,about the pivot ~oint between the upper and lower bodie~ in the foreship. A posltive wlre force ln the hanger tackle is thereby retalned, however, as the hol~tlng welght of the lower body ln the hanger tackle r~malns larger than ; lts buoyancy, An alternative embcdi~ant 18 such that the boaie3 form a nesting ~h~le a6 ths lower body 1B adapted to be recelved in a fo~e and aft well ln the upper body, ana a sound construction of the lower body 18 ochlev~d as tho lower bcdy has a ~upportlng outer hull aroun~ the cylindrical pressur~ hull, wlth the 8paCQ provlded between the outer hull and the pres~ure hUll bslng flooded, and pre~erably the outer hull con~lst~ of a ~ubstantially open truss atructure. The lower body thu8 forms a quite sturdy, but nevertheless llght support whlch carrles as a core the prassure-resi~tant cylinder with pumps and lLnes.
.' , .
:
- 113~3Zti In the two herein di~closed ~mbodlment~ 1~ further provlded th~t the 1addQX 1B to be brought above the water n8 the low~r body plvotally ~upport~ the ladder.
The lnvention 15 de~crlbed ln re det~ll herelnaft0r ln vlew of the dr~wlng~ showing lllustr~ti~e embodlments thoxeo~.
Brle$ Des~rlptlon o~ the Drawlngs Flgure 1 18 a longitudinal view of the entlre dredging ves~el ln floatlng condltion, with tho lower body ~loatad up to below th~ upper ~ody and belnq ~ecured thereto7 flgure 2 1~ a planview of ~he dre~ging ve~al of flgure 1;
flgure 3 show~ the dredging ves~el of figures 1 and 2 in longltudlnal vlew when the lower body slnks aown~
fleure 4 ~hows tho ~unken down con~ltion wlth the dxedglng lmplement ~xtended do~n to th~ deep ~ottom~ and flguro 5 ~hows another embodlment of the dkedglng ve~el ln longltudinal vl-w, wlth ~he lower body belng ~dapted to be pivot~d into and out of a ~oro and a~t well ln the upper body.
D-~crlptlon of the Pr~ferred Embodlments ThQ dredgl~g vessel 1 as r~pre~ented in the drawings ln a deep~ea ~uction cutter dredg~r which he~laes at the usual dxedglng depth~ up to 30 met~rs can al~o reach wlth lt~ dredging impl~ment 3 w~lch 1Y supported ~y the ladder 2 ana con~lsts of a cutter or ~xGa~ator wheel down to the bottom 4 ln waSer with a depth of even up to 100 mater&.
To that end the dredging ves~el 1~ constructed o~ an upper body 5 and a lo~ex body 6, whlch has in the foreship a plvot ~oint 7 with the upper 113~82~;
body 5. In the rear part of the lower body 6, which part 18 movable about the plvot Joint 7 ln a hanger tackle 8 ~rom the winch 9, ~ drivlng tank 10 is arrangcd. By ballAstln~ ~aid tank 10 the lowQr body 6 cantlng on the pivot ~o~nt 7 ln deeper wat~r with lts rear part whlch carrlee the ladder 2, can be suhmerged wlth the dredging implement 3 whlch it suppoxts, down to the bottom 4 to carry out dredglng operatlon~ there.
By emptying th~ tank 10 and haullng the t~ckle 8 wlth the winch 9 the lower body 6 can fl~at up agaln up to below the upper body 5 and can be integrally connected th~rewlth for dredglng operation~ in shellow water.
Flgure~ 1-4 show an embodim~nt ln whlch the lower body 6 forms the o~t~r hull part and the upper body 5 form~ ~he lnner hull part to be r~c~lved and se~ured therein. Flgur~ S ~how~ the rever~e sltuatlon that the lower body 6 i~ adapted to be recQlved and secured wlthin the upper bcdy 5 ln a fore and aft well 11 thereln.
The upper body 18 preferably arranged as an englne pontoon, wlth an englna room 12, and carrled the surface lines 13 of the mud llne system, of whlch the ~ubmerged llne ~eCt~n 14, wlth the pertalning pu~p~, to wlt suctlon pu~p lS, the ~uotlon llne 16 o~ whlch act~ on the dredglng lmplement 3, and a rlser pump 18 which ls ln~tallod ln the pre~sure line 17 of the pump 15 to pre~s the mud ~urther aw~y, is situated in the lower body 6. The two llno ~ectlon~ 13 and 14 ara to be mutually coupled at the plvot ~oin~ 7.
~n osder to be able ~o wlth~tand the water pressure from all ~ideæ at greater dRptha th~ lower body 6, ~9 ~ho~n with dotted lines ln i~ure 3 and also ln flgure 5, i~ prov~d~d wlth a preæsuro-re~i3tant cltadel or core 19, the pr2~sura str0ngth o~ which at greater ~ubmerged depths ~hould gradually al80 be hlgher. The citadel 19 cGnsl~ts of a cyl~ndrlcal pressure hull which 18 relnforcea by ~he ~rames a~d ~lkhead~ 20. Th~ dlameter of the cyllnder 19 18 gradually reduced towardæ deeper water, l.e. towards ~13~ 6 the rearship of the lower body 6, ~o a~ to be able to wlthstand higher pres~ures, and has,as illu~trated, at e~ch of the tranaverae bulkhea~ 20 a stepwi~e adaptation 21.
The body space wlthin th~ cyl~nder 19 form~ a walk-bl~ pa38age from ~ore to aft and i8 acce~slble ~rom the forepart 22 of the low~r ~ody 6 ahead of the pivot ~oint 7, whlah part, when the lower body i5 sunken down, pivot~ up. The body ~pace 23 out~lde the cylinder 19 $8 flooded by water from tha outslde. ~he lower body 6 may have a close~ outer hull 24 whlch, as ~h~ kody space 23 ls ~loo~cd, need not be adapted ~o water pras~ure from all side~, but the lowe~ body 6 may a~ well foxm an open tru~s cage 25 whlch ~upports th~ pres~ure oyllnder 19 pre~orably at ~he ~ransv~r~e bulkhead~ 20.
The hydraullco of th~ 3ubmer~1bl~ lower body 6 ara prearably 80 that the welght thereo~ ls substantlally in balance wlth the buoyancy provlded by lt~ pre~nure-reslstant core 19, ~o that by ballastlng and emptying the pre~ tanlc lO ~nd~or b~ operating th0 winch 9, the lower body 6 can l:e c-u8ed to qulckly ~ink down~ and float up, re~pectlvely.
:
In order to be able to brlng tho laddar above the water it 1~ vertl~ally plvotally connact~d to the lower body. ~here should, however, ln vlew of the due to the ~teep ~lope at which the ladder ls ~tandlng when dredging t great depths, con-~aerabl~ longltudlnal coqnponent of the force exerted on the dredglng ln~plement when ~redging, a po~ltion ~lxatlon of the plvotal ladder be pre~ent, whlch ls not further represented in the dra~ing~.
A dredging vessel of that type can extend its dredge consisting of a rotary cutter ~r an excavator wheel to which a suction tube is connected, down to a depth of 30 meters, but often dredging operations in deeper water are to b~ performed.
; ~:
Summary of the Invention ~he present in~-ention has as its object to fulfil this requirement and achieves this cue to the aspect that the dredging vessel so as to be - adapted to be used as well on a track on a deep bottom is constructed of - an upper body ~nd a lower body which supports the ladder, and when emptied ~-' floats up to below the upper body, and when ballasted sin~s down so as to extend the ladc`er down to the deep bottom. This sinking down is made possible by a ~ivot joint between the upper and lower bodies in the fore- ;
ship and a hancer tackle therebetween in the aftship, with the further aspect that the upper body is arranged as an engine pontoon and carries the upper mud line system whereas the lower body carries the lower mud line system, s~;d two line systems being adapted to be coupled at the pivot joint between the upper and lower bodies.
It will thus be possible to dredge down to a depth of 100 meters-' On the deeply ~ bmerged parts of the lower body a high pressure from all i~ ~
' ' : ! : , :
~3~8Z6 s~de~ wlll he exert~d and thia pres6ure can be taken a~ the lower body consistq of a pontoon, having ln it~ deeply submerslble paxts a pres~ure-reslstant citadel, and the lower body can take the lncreaslng pres~ure at gr~ater depths as the cyllndrlcal pres~ure hull deflning the cltadel consl~t~
oP sectlon~ deflned by transver~e ~ulkhead~, the dlameter o~ whlch 18 reduced tow~rds more deeply sub~erslble pArts, ~o that wlth equal thlckne~
- of the pressure hull it~ pressure a~rength at greater depths gradually lncreases.
The hereln disclo3ed d~epsea suction cutter dredger 13 further characterized ln that the forepart of the lowor body when thl~ lower body sinks down plvots up to above the water and gives acce~s to the lower kody, and in that ln the rear part of the lcwer body a quick d~n~t~nk to be emptled and ballasted ls arranged. There can be a constant balance between the b~oyancy of the pres~ure-resl~tant core and the welght of the - for the remalnder flooded - pontoon, of which the lower body conslsts, and sinklng down, and flo-tlng up, respectlvely, 1~ controlled by the small qulck divlng tank in the rear~hip o~ sald lowar pontoon, ~ald tank only having to provide a small ~orce to exert a momantladapted for floating up or sink ng down,about the pivot ~oint between the upper and lower bodie~ in the foreship. A posltive wlre force ln the hanger tackle is thereby retalned, however, as the hol~tlng welght of the lower body ln the hanger tackle r~malns larger than ; lts buoyancy, An alternative embcdi~ant 18 such that the boaie3 form a nesting ~h~le a6 ths lower body 1B adapted to be recelved in a fo~e and aft well ln the upper body, ana a sound construction of the lower body 18 ochlev~d as tho lower bcdy has a ~upportlng outer hull aroun~ the cylindrical pressur~ hull, wlth the 8paCQ provlded between the outer hull and the pres~ure hUll bslng flooded, and pre~erably the outer hull con~lst~ of a ~ubstantially open truss atructure. The lower body thu8 forms a quite sturdy, but nevertheless llght support whlch carrles as a core the prassure-resi~tant cylinder with pumps and lLnes.
.' , .
:
- 113~3Zti In the two herein di~closed ~mbodlment~ 1~ further provlded th~t the 1addQX 1B to be brought above the water n8 the low~r body plvotally ~upport~ the ladder.
The lnvention 15 de~crlbed ln re det~ll herelnaft0r ln vlew of the dr~wlng~ showing lllustr~ti~e embodlments thoxeo~.
Brle$ Des~rlptlon o~ the Drawlngs Flgure 1 18 a longitudinal view of the entlre dredging ves~el ln floatlng condltion, with tho lower body ~loatad up to below th~ upper ~ody and belnq ~ecured thereto7 flgure 2 1~ a planview of ~he dre~ging ve~al of flgure 1;
flgure 3 show~ the dredging ves~el of figures 1 and 2 in longltudlnal vlew when the lower body slnks aown~
fleure 4 ~hows tho ~unken down con~ltion wlth the dxedglng lmplement ~xtended do~n to th~ deep ~ottom~ and flguro 5 ~hows another embodlment of the dkedglng ve~el ln longltudinal vl-w, wlth ~he lower body belng ~dapted to be pivot~d into and out of a ~oro and a~t well ln the upper body.
D-~crlptlon of the Pr~ferred Embodlments ThQ dredgl~g vessel 1 as r~pre~ented in the drawings ln a deep~ea ~uction cutter dredg~r which he~laes at the usual dxedglng depth~ up to 30 met~rs can al~o reach wlth lt~ dredging impl~ment 3 w~lch 1Y supported ~y the ladder 2 ana con~lsts of a cutter or ~xGa~ator wheel down to the bottom 4 ln waSer with a depth of even up to 100 mater&.
To that end the dredging ves~el 1~ constructed o~ an upper body 5 and a lo~ex body 6, whlch has in the foreship a plvot ~oint 7 with the upper 113~82~;
body 5. In the rear part of the lower body 6, which part 18 movable about the plvot Joint 7 ln a hanger tackle 8 ~rom the winch 9, ~ drivlng tank 10 is arrangcd. By ballAstln~ ~aid tank 10 the lowQr body 6 cantlng on the pivot ~o~nt 7 ln deeper wat~r with lts rear part whlch carrlee the ladder 2, can be suhmerged wlth the dredging implement 3 whlch it suppoxts, down to the bottom 4 to carry out dredglng operatlon~ there.
By emptying th~ tank 10 and haullng the t~ckle 8 wlth the winch 9 the lower body 6 can fl~at up agaln up to below the upper body 5 and can be integrally connected th~rewlth for dredglng operation~ in shellow water.
Flgure~ 1-4 show an embodim~nt ln whlch the lower body 6 forms the o~t~r hull part and the upper body 5 form~ ~he lnner hull part to be r~c~lved and se~ured therein. Flgur~ S ~how~ the rever~e sltuatlon that the lower body 6 i~ adapted to be recQlved and secured wlthin the upper bcdy 5 ln a fore and aft well 11 thereln.
The upper body 18 preferably arranged as an englne pontoon, wlth an englna room 12, and carrled the surface lines 13 of the mud llne system, of whlch the ~ubmerged llne ~eCt~n 14, wlth the pertalning pu~p~, to wlt suctlon pu~p lS, the ~uotlon llne 16 o~ whlch act~ on the dredglng lmplement 3, and a rlser pump 18 which ls ln~tallod ln the pre~sure line 17 of the pump 15 to pre~s the mud ~urther aw~y, is situated in the lower body 6. The two llno ~ectlon~ 13 and 14 ara to be mutually coupled at the plvot ~oin~ 7.
~n osder to be able ~o wlth~tand the water pressure from all ~ideæ at greater dRptha th~ lower body 6, ~9 ~ho~n with dotted lines ln i~ure 3 and also ln flgure 5, i~ prov~d~d wlth a preæsuro-re~i3tant cltadel or core 19, the pr2~sura str0ngth o~ which at greater ~ubmerged depths ~hould gradually al80 be hlgher. The citadel 19 cGnsl~ts of a cyl~ndrlcal pressure hull which 18 relnforcea by ~he ~rames a~d ~lkhead~ 20. Th~ dlameter of the cyllnder 19 18 gradually reduced towardæ deeper water, l.e. towards ~13~ 6 the rearship of the lower body 6, ~o a~ to be able to wlthstand higher pres~ures, and has,as illu~trated, at e~ch of the tranaverae bulkhea~ 20 a stepwi~e adaptation 21.
The body space wlthin th~ cyl~nder 19 form~ a walk-bl~ pa38age from ~ore to aft and i8 acce~slble ~rom the forepart 22 of the low~r ~ody 6 ahead of the pivot ~oint 7, whlah part, when the lower body i5 sunken down, pivot~ up. The body ~pace 23 out~lde the cylinder 19 $8 flooded by water from tha outslde. ~he lower body 6 may have a close~ outer hull 24 whlch, as ~h~ kody space 23 ls ~loo~cd, need not be adapted ~o water pras~ure from all side~, but the lowe~ body 6 may a~ well foxm an open tru~s cage 25 whlch ~upports th~ pres~ure oyllnder 19 pre~orably at ~he ~ransv~r~e bulkhead~ 20.
The hydraullco of th~ 3ubmer~1bl~ lower body 6 ara prearably 80 that the welght thereo~ ls substantlally in balance wlth the buoyancy provlded by lt~ pre~nure-reslstant core 19, ~o that by ballastlng and emptying the pre~ tanlc lO ~nd~or b~ operating th0 winch 9, the lower body 6 can l:e c-u8ed to qulckly ~ink down~ and float up, re~pectlvely.
:
In order to be able to brlng tho laddar above the water it 1~ vertl~ally plvotally connact~d to the lower body. ~here should, however, ln vlew of the due to the ~teep ~lope at which the ladder ls ~tandlng when dredging t great depths, con-~aerabl~ longltudlnal coqnponent of the force exerted on the dredglng ln~plement when ~redging, a po~ltion ~lxatlon of the plvotal ladder be pre~ent, whlch ls not further represented in the dra~ing~.
Claims (12)
1. A dredging vessel comprising;
a) an upper body having a sufficient buoyance to float on the surface of the water, b) a lower body having a proximal end and distal end, said proximal end being pivotally connected to said upper body to permit movement of the lower body between a raised position in which it extends closely adjacent said upper body and a lowered position in which said distal end depends to a substantial depth below said upper body, c) ladder means having a proximal end and distal end, said proximal end of said ladder means being mounted on said distal end of said lower body for movement between a raised position in which it extends closely adjacent said lower body and a lowered position in which its distal end depends below the lower body, d) dredge means mounted on the distal end of the ladder, e) ballast means carried by the lower body to facilitate lowering thereof to locate the ladder and its associated dredge means in an operable dredging position.
a) an upper body having a sufficient buoyance to float on the surface of the water, b) a lower body having a proximal end and distal end, said proximal end being pivotally connected to said upper body to permit movement of the lower body between a raised position in which it extends closely adjacent said upper body and a lowered position in which said distal end depends to a substantial depth below said upper body, c) ladder means having a proximal end and distal end, said proximal end of said ladder means being mounted on said distal end of said lower body for movement between a raised position in which it extends closely adjacent said lower body and a lowered position in which its distal end depends below the lower body, d) dredge means mounted on the distal end of the ladder, e) ballast means carried by the lower body to facilitate lowering thereof to locate the ladder and its associated dredge means in an operable dredging position.
2. A dredging vessel as claimed in claim 1, wherein the pivotal connection between the upper and lower bodies is located at the foreship end of the vessel and a hanger tackle is provided at the aftship end of the vessel, the hanger tackle connecting the upper and lower bodies and being operative to effect raising and lowering of the lower body.
3. A dredging vessel as claimed in claim 1 or 2, characterized in that the upper body forms an engine pontoon and carries an upper mud line system and the lower body carries a lower mud line system, said upper and lower systems being adapted to be coupled at the point where the upper and lower bodies are pivotally connected.
4. A dredging vessel as claimed in Claim 1 wherein the lower body consists of a pontoon having a deeply submersible portion which includes a pressure-resistant hull.
5. A dredging vessel as claimed in claim 4, wherein the pressure-resistant enclosure is in the form of cylindrical pressure hull which comprises a plurality of sections each having a transverse bulkhead, the diameter of which is reduced in successive deeply submersible portions.
6. A dredging vessel as claimed in Claim 2, 3 or 5, wherein the proximal end of the lower body is disposed above the waterline when the lower body is in said lowered position whereby access to lower body can be obtained from above the waterline by way of said proximal end of the lower body.
7. A dredging vessel according to claim 1, 2 or 4 wherein a quick dive tank is provided at the distal end of the lower body, said quick dive tank being adapted to be emptied and ballasted as required in use.
8. A dredging vessel according to claim 2, wherein the weight of said lower body is such that it is not buoyant in any position between said raised and lowered position.
9. A dredging vessel as claimed in Claim 4 wherein the lower body is adapted to be received in a fore and aft well formed in the upper body.
10. A dredging vessel as claimed in claim 9 wherein the lower body has a supporting outer hull extending around said pressure-resistant hull in a spaced relationship to provide a flooding chamber therebetween.
11. A dredging vessel as claimed in claim 9 wherein the outer hull comprises a substantially open truss structure .
12. A dredging vessel according to claim 1, 2 or 9 wherein the lower body pivotally supports said ladder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8001287 | 1980-03-04 | ||
| NL8001287A NL8001287A (en) | 1980-03-04 | 1980-03-04 | Dredger vessel with ladder - has hull lower portion holding ladder on bottom when ballasted |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1130826A true CA1130826A (en) | 1982-08-31 |
Family
ID=19834929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA352,831A Expired CA1130826A (en) | 1980-03-04 | 1980-05-27 | Dredging vessel |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1130826A (en) |
| NL (1) | NL8001287A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3601461A1 (en) * | 1986-01-20 | 1987-08-06 | Tacke Kg F | Drive arrangement for extracting and conveying minerals from the sea bed |
-
1980
- 1980-03-04 NL NL8001287A patent/NL8001287A/en not_active Application Discontinuation
- 1980-05-27 CA CA352,831A patent/CA1130826A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL8001287A (en) | 1981-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |