US3557968A - Ships hoisting gear for heavy loads - Google Patents

Ships hoisting gear for heavy loads Download PDF

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Publication number
US3557968A
US3557968A US786625A US3557968DA US3557968A US 3557968 A US3557968 A US 3557968A US 786625 A US786625 A US 786625A US 3557968D A US3557968D A US 3557968DA US 3557968 A US3557968 A US 3557968A
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US
United States
Prior art keywords
booms
luffing
boom
auxiliary
lifting beam
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 - Lifetime
Application number
US786625A
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English (en)
Inventor
Hans Thaeter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atlas Mak Maschinenbau GmbH
Original Assignee
Atlas Mak Maschinenbau GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Atlas Mak Maschinenbau GmbH filed Critical Atlas Mak Maschinenbau GmbH
Application granted granted Critical
Publication of US3557968A publication Critical patent/US3557968A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/60—Derricks
    • B66C23/605—Derricks employing ships' masts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/52—Floating cranes
    • B66C23/525—Double slewing cranes on ships

Definitions

  • the gear comprises an auxiliary luffing boom between the two booms or derricks, and hoisting ropes which are taken from the booms or derricks over pulleys on said lifting beam to the head of the auxiliary luffing boom to which their ends are anchored.
  • This invention relates to ships hoisting gear for heavy loads, in the form of twin booms or derricks stayed from a mast for luffing and slewing and cooperating to hoist a common lifting beam carrying a load.
  • Two booms or twin derricks are a common form of hoisting gear on ships, each boom or derrick being available for hoisting light loads, whereas both booms or derricks together are also operable in parallel for lifting a heavy load attached to a lifting beam.
  • this object is achieved by the provision of an auxiliary luffing boom between two booms or derricks, and hoisting ropes which are taken from the booms or derricks over pulleys on a lifting beam to the head of the auxiliary luffing boom to which their ends are anchored.
  • the hoisting gear may be operated by designing the auxiliary luffing boom to extend roughly to the side of the ship.
  • the booms or derricks are luffed from their maximum to their minimum radio radius of action.
  • the load will then move about half the distance it would move if suspended from the booms or derricks individually. in calculating the stresses it must be remembered that the hoisting ropes exert their pull at an angle.
  • the lufiing winch for the auxiliary boom is designed to handle the full moving load, the derricks and the auxiliary luffing boom may be luffed substantially simultaneously. This provides a favorable loading radius and stress distribution.
  • FIG. 1 is a side elevational view of a twin boom derricking crane with an auxiliary boom in working position
  • FIG. 2 is a top plan view of a twin boom derricking crane and auxiliary boom.
  • FIGS. 1 and 2 show a derricking crane with twin booms or derricks 3 and 4 luffed about horizontal pivot pins 5 into parallel position and capable of being slewed about vertical axles l and 2.
  • An auxiliary luffing boom 6 can be luffed on a horizontal axle 10 and is sus ended from luffing ropes l7 and 18 which run over pulleys l and 20. With advantage the pulleys 19 and 20 are attached to a crossbeam 21 on a mast 24. The luffing ropes 17 and 18 are taken to a luffing winch not shown in the drawing.
  • the load is suspended from a lifting beam 14.
  • Pulleys l5 and 16 are mounted on top of the lifting beam 14.
  • Each of two hoisting ropes 22 and 23 runs from a winch, not shown, over pulleys 25 and 26 on the mast 24 to a pulley 27 at the boom head 11, back to a pulley 28 at the mast and then over a fixed pulley 29 on the boom head 11 back over one of the pulleys 15 and 16 to the head 7 of the auxiliary boom 6 where its end 8 or 9 is anchored.
  • the booms 3 and 4 of the derricking crane and the auxiliary luffing boom 6 may be rotatable about the common axis 12 of the mast 24. When not in use the auxiliary luffing boom 6 can be elevated into the vertical and also secured to the mast.
  • the two booms 3 and 4 each can each be independently luffed by a hydraulic cylinder 30 in a known manner.
  • FIG. 1 illustrates the transfer of a load 13 into a position 13' by luffing of the booms 3 and 4. The two booms 3 and 4 will then be in the positions indicated at 3 and 4'.
  • a hoisting gear for heavy loads comprising a mast, a lifting beam having pulley means for carrying a load, a pair of twin booms pivotally attached to said mast for luffing and slewing and cooperating to hoist said lifting beam carrying a load, an auxiliary luffing boom pivotally mounted between said pair of booms, and hoisting ropes extending from said pair of booms through said pulley means of the lifting beam to the head of the auxiliary luffing boom whereby the weight of said load supported by said lifting beam is proportionally distributed between said twin and auxiliary booms.
  • a hoisting gear according to claim 2 further comprising a crossbeam with pulleys attached to said mast and a luffing winch, said auxiliary luffing boom being suspended from by luffing ropes extending through said pulleys on said crossbeam to said lufiing winch.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US786625A 1968-01-19 1968-12-24 Ships hoisting gear for heavy loads Expired - Lifetime US3557968A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA29083U DE1982859U (de) 1968-01-19 1968-01-19 Schiffsladevorrichtung fuer schwere lasten.

Publications (1)

Publication Number Publication Date
US3557968A true US3557968A (en) 1971-01-26

Family

ID=6926811

Family Applications (1)

Application Number Title Priority Date Filing Date
US786625A Expired - Lifetime US3557968A (en) 1968-01-19 1968-12-24 Ships hoisting gear for heavy loads

Country Status (11)

Country Link
US (1) US3557968A (fr)
DE (1) DE1982859U (fr)
ES (1) ES159461Y (fr)
FI (1) FI47738C (fr)
FR (1) FR1596210A (fr)
GB (1) GB1232192A (fr)
NL (1) NL6900893A (fr)
NO (1) NO123413B (fr)
PL (1) PL80900B1 (fr)
SE (1) SE336540B (fr)
YU (1) YU31271B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4653656A (en) * 1984-07-30 1987-03-31 Triplett James T Double center luffing crane
US6065620A (en) * 1998-03-27 2000-05-23 Trans World Crane, Incorporated Movable sheave assembly for a crane
US20100102017A1 (en) * 2007-02-16 2010-04-29 Itrec B.V. Hoisting crane and vessel with such a crane
US11525229B2 (en) * 2018-09-17 2022-12-13 Tetrahedron B.V. Crane vessel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245549A (en) * 1964-04-24 1966-04-12 Virgil H Trevisan Toppling boom
US3446362A (en) * 1967-07-10 1969-05-27 Testing Associates Inc Derrick for ships

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245549A (en) * 1964-04-24 1966-04-12 Virgil H Trevisan Toppling boom
US3446362A (en) * 1967-07-10 1969-05-27 Testing Associates Inc Derrick for ships

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4653656A (en) * 1984-07-30 1987-03-31 Triplett James T Double center luffing crane
US6065620A (en) * 1998-03-27 2000-05-23 Trans World Crane, Incorporated Movable sheave assembly for a crane
US20100102017A1 (en) * 2007-02-16 2010-04-29 Itrec B.V. Hoisting crane and vessel with such a crane
US8459477B2 (en) * 2007-02-16 2013-06-11 Itrec B.V. Hoisting crane and vessel with such a crane
US11525229B2 (en) * 2018-09-17 2022-12-13 Tetrahedron B.V. Crane vessel

Also Published As

Publication number Publication date
FI47738C (fi) 1974-03-11
NL6900893A (fr) 1969-07-22
GB1232192A (fr) 1971-05-19
SE336540B (fr) 1971-07-05
FI47738B (fr) 1973-11-30
FR1596210A (fr) 1970-06-15
PL80900B1 (fr) 1975-08-30
ES159461Y (es) 1971-03-16
DE1982859U (de) 1968-04-04
YU31271B (en) 1973-02-28
ES159461U (es) 1970-10-16
NO123413B (fr) 1971-11-08

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