US3079006A - Derrick construction - Google Patents

Derrick construction Download PDF

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Publication number
US3079006A
US3079006A US158471A US15847161A US3079006A US 3079006 A US3079006 A US 3079006A US 158471 A US158471 A US 158471A US 15847161 A US15847161 A US 15847161A US 3079006 A US3079006 A US 3079006A
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Prior art keywords
boom
capstan
flexible element
winch
secured
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Expired - Lifetime
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US158471A
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English (en)
Inventor
Eckhardt Wolfgang
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H C STULCKEN SOHN
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H C STULCKEN SOHN
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/04—Arrangement of ship-based loading or unloading equipment for cargo or passengers of derricks, i.e. 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
    • B66C23/60—Derricks
    • B66C23/605—Derricks employing ships' masts

Definitions

  • the present invention relates to derricks in general, and more particularly to a derrick construction which is especially suited for use as a ship hoist.
  • An important object of the invention is to provide a derrick construction wherein the boom may be topped in vertical directions and/or swung in lateral directions with the help of a single hanger winch.
  • Another object of the invention is to provide a derrick construction of the just outlined characteristics wherein the boom may be swung in lateral directions by means of a power-driven capstan whose energy requirements are exceptionally low and which may be mounted directly on the boom.
  • a further object of the invention is to provide a derrick construction which may be utilized for handling of exceptionally heavy loads even though its energy requirements need not exceed the energy requirements of conventional derricks.
  • An additional object of my invention is to provide a derrick construction of the above outlined characteristics wherein a single flexible motion transmitting means may adjust the working inclination and the lateral movements of the boom, and wherein a single mast is sufficient to properly support the boom.
  • a derrick construction which comprises a supporting means preferably including a mast which carries a cross tree or a like supporting structure at a distance above the ground, a boom or jib whose lower portion is connected to the mast or to another com ponent of the supporting means at a level below the cross tree so that the boom may turn about a horizontal and/or a vertical pivot axis, and means for turning the boom about the two axes including a hanger winch, powerdriven rotary capstan means secured to the upper end portion of the boom, anchoring means provided on the cross tree at one side of the boom, guide means provided on the cross tree at the other side of the boom, and a flexible element which has one of its end portions secured to the anchoring means and whose other end portion is anchored in the winch drum.
  • Certain other features of the invention reside in special mounting of the capstan at the upper end of the boom, in special construction of the capstan so that it may engage with a flexible element in the form of a rope, cable, chain or beaded cord, in the provision of tackles which enable the boom to lift very heavy loads, and in the provision of special guide rolls which retain the flexible element in requisite position with respect to the capstan.
  • FIG. 1 is a perspective view of a derrick construction which embodies one form of my invention
  • FIG. 2 is a front elevational view of a power-driven rotary capstan which forms part of the means for turning the boom in the derrick construction of FIG. 1;
  • FIG. 2A is a view similar to FIG. 2, but shows certain parts of the capstan in section and indicates an electric cable;
  • FIG. 3 is a fragmentary side elevational view of a. boom whose upper end portion coaxially supports a modified capstan;
  • FIG. 4 is a similar fragmentary side elevational view of a boom whose upper end portion supports a capstan having an axis which is perpendicular to and intersects the axis of the boom;
  • FIG. 5 illustrates the structure of FIG. 4 in a position turned through degrees about the axis of the boom
  • FIG. 6 is a fragmentary side elevational view of a boom whose upper end portion supports a capstan having a horizontal axis of rotation which is perpendicular to and laterally ofl'set from the longitudinal axis of the boom;
  • FIG. 7 illustrates the structure of FIG. 6 in a position turned through 90 degrees about the axis of the boom
  • FIG. 8 is a fragmentary front elevational view of; a boom and of a diflerently guided flexible element which forms part of the means for turning the boom;
  • FIG. 9 is a side elevational view of a different capstan which comprises a sprocket for guiding and driving a flexible element in the form of a chain;
  • FIG. 10 is a transverse section through a capstan whose drum is formed with concave peripheral grooves or seats for the beads of a flexible element which passes about and engages with the drum.
  • a derrick construction which is assumed to be mounted on the deck 1 of a ship and which comprises supporting means including an upright mast 2 anchored in the deck 1 and supporting a cross tree 3 at a point spaced from the deck.
  • the lower end portion if a boom or jib 4 is turnably supported in a connecting means including a bracket 5 which is fixed to the mast 1 at a point below the cross tree 3 and a so-called derrick socket 6 including a pivot pin 7 turnable in the bracket 5 about a vertical axis.
  • the socket 6 has a bifurcated upper portion which supports the lower end portion of the boom 4 in such a way that the boom is turnable about the horizontal axis of a second pivot pin 8.
  • the connecting means 5, 6 supports the boom 4 in such a way that the latter is selectively or simultaneously turnable about the vertical axis of the pin 7 or about the horizontal axis of the pin 8 which latter secures the lower end portion of the boom to the bifurcated upper portion forming part of the socket 6.
  • the upper end portion or head of the boom 4 carries a motor-driven rotary capstan 9 whose construction will be explained in connection with FIG. 2.
  • This capstan forms part of the means for turning the boom about the connecting means 5, 6, and this turning means further comprises an anchoring member in the form of an eye bolt 10 which is secured to one arm of the cross tree 3 at one side of the boom 4, a guide pulley 11 which is secured to the other arm of the cross tree 3 and is located at the other side of the boom, a manually operable or motor-driven hanger winch 12 which is mounted on the deck 1, and a flexible element here shown as a cable or rope 13 which has one of its ends anchored in the drum of the hanger Winch 12 and whose other end is secured that, if the winch 12 is operated in a sense to pay out the cable 13 and the capstan 9 is rotated in anticlockwise direction to travel along the cable 13 in a direction toward the guide pulley 11, the boom will turn about the horizontal pin 8 to change its working inclination and its head will descend while the length
  • the Winch 12 remains idle and the motor of the capstan 9 is driven in a direction to move the capstan toward the anchoring member 10 or toward the guide pulley 11. Gf course, it is possible to operate the winch and the capstan motor in such away that the head of the boom rises or descends and is simultaneously swung toward or away from the guide pulley 11.
  • the cargo hoisting gear of the derrick construction includes a load supporting book 14 which is mounted at the free end of a second cable 14a passing about a guide pulley 15 secured to the head of the boom 4, about a second guide pulley 16 which is secured to the socket 6, and having its other end anchored in the drum of a load winch mounted on the deck 1.
  • the hollow rotary member or drum 18 of the power-driven capstan 9 accommodates a reversible motor 19 and a transmission adapted to drive this drum in clockwise or anticlockwise direction in a manner well known in the art.
  • the drum 18 is rotatable in a cage or frame 20 which is provided with an eye 21 sent.
  • the cage 20 comprises several interconnected U-shaped bails 22 some or all of which are provided with guide rolls 23 having axes perpendicular to the axis of the drum 18. These rolls extend into close proximity of the periphery of-the drum and serve as a means for maintaining the convolutions 13a of the cable 13 in spaced relation. It will be noted that the rolls 23 extend substantially radially with respect to the drum 18 so that they positively prevent any undesirable intermingling or overlapping of the convolutions 13a.
  • one end of the hollow drum 18' is rotatably supported on a hollowshaft member 40 rigidly secured-to frame 20.
  • Shaft member 49 turthersupports the housing of motor 19.
  • the other end of drum 13 is rotatably supported on a shaftmember 41 which is.
  • FlGQ3 illustrates a modified capstan 1%)? including a drum 11Srnounted on a shaft 124 whose axis coincides with the axis of .the boom ,4, lie.
  • the capstan 109 is coaxial with and is rotatably mounted at the upper end portion of the boom.
  • the drum 118 is driven by a reversible motor 119 which ismounted on but preferably in the head of theflboomA and which drives a transmission 125 coupled to the shaft 124.
  • the cable 13 is guided by rolls 123 whose axes are substantially perpendicular to the axes of the shaft 124 and boom 4.
  • the rolls 123 are mounted in a suitable frame 120 secured to the housing of the transmission 125.
  • the cable 13 is guided by two groups of guide rolls including a first group of rolls 223 whose axes are perpendicular to the axis of the drum 218 and substantially perpendicular to the axis of the boom 4, and a second group of rolls 223a whose axes are perpendicular to the axis of the boom but are parallel with the axis of the drum 218.
  • a first group of rolls 223 whose axes are perpendicular to the axis of the drum 218 and substantially perpendicular to the axis of the boom 4
  • a second group of rolls 223a whose axes are perpendicular to the axis of the boom but are parallel with the axis of the drum 218.
  • one guide roll 223 is provided at each side of the drum 218, and the purpose of these rolls is to guide the convolutions 13a in planes which are substantially parallel to the axis of the boom.
  • the pairwise arranged rolls 223a guide the cable 13 independently of the angle enclosed by the cable portions 13b, 13c.
  • the carriers which support the rolls 223, 223a are secured to the housing of the transmission 125.
  • FIGS. 6 and 7 is analogous to that shown in FIGS. 4 and 5, excepting that the s aft 224 of the capstan drum 218 is supported by a modified twoarmed bracket 325 so that the axis of the drum 218 is laterally offset from and is perpendicular to the axis of the boom 4.
  • the guide rolls 323 are mounted in the same way and perform the same function as the rolls 223 of FIGS. 4 and 5.
  • the transmission 125 preferably includes a self-locking device, such as a worm and a meshing worm Wheel, in order to enable the capstan to operate without a. brake.
  • a brake is always necessary if the transmission includes only a simple gear train.
  • FIG. 8 illustrates a modified derrick construction in which the cable 13 includes three cable portions 13A, 13B, 13C extending between the twin guide rolls 11A, 11B and the head'of the boom 4, and three cable portions 13A, 13B, 13C extending between the anchoring member 19A and the boom head.
  • "T he capstan 209 is of the type shown in FIGS. 4 and S, i.e. the axis of its drum 218 is perpendicular to and intersects the axis of the boom. The transmission and the motor of the capstan 209 are assumed to be concealed in the upper end portion of the boom.
  • the cable 13 extends from the hanger Winch 12 about the guide pulley 11A, about a second guide pulley 30 which is suspended on the head of the boom 4 at a point below the capstan 209, about the guide pulley 11B, about the drum 213 of the capstan 209, about the guide pulley 31 carried by the anchoring member 10A, about a further guide pulley 32 which is secured to the head of a boom 4 preferably in mirror symmetry with the pulley 3g), and the second end of the cable 13 is then secured to the anchoring member 10A.
  • the cable 13 passes about a first threefold tackle including the pulieys 11A, 11B and 3t and about a second threefold tackle including the pulleys 31, 32.
  • the head of the boom 4 will perform a composite movement including a movement about the pivot pin 7 and about the pin 8 (see FIG. 1). If it is desired to top the boom without any swinging movement, i.e.
  • the capstan 209 must be driven in a sense to make sure that the length of cable portions 13A, 13B, 13C, increases or decreases at the same rate as the length of cable portions 13A, 13B, If the motor of the capstan is driven and the winch 12 remains idle, the boom will swivel in an are about the axis of the vertical pin 7 so that the load supporting hook (not shown) travels on the periphery of a circle.
  • the bracket 33 which supports the guide rolls 11A, 11B is mounted on one arm 3a of the cross tree, and the anchoring member NA is mounted on the other arm 3b of the cross tree.
  • I provide a derrick construction in which a single hanger winch 12, in cooperation with a motor-driven capstan at the head of the boom, may bring about any desired movement of the boom, including topping and lateral swinging movements of the boom, in contrast to known derrick constructions of which I am aware at this time and which utilize two hanger Winches and two distinct cables each having one of its ends anchored in the respective winch and another end secured to the head of the boom.
  • it is necessary to operate both hanger winches at different speeds in order to bring about a swinging movement of the boom whereas the boom of my improved derrick construction may be swung back and forth about a vertical pivot axis merely by starting the motor of the capstan in clockwise or anticlockwise direction.
  • capstan motor The energy consumption of the capstan motor is very low since this motor is normally required to overcome a very small resistance when it swings the head of the boom about the vertical pivot pin 7. This accounts for the fact that the capstan motor may be accommodated in the capstan drum (FIG. 2) or that it may be mounted in the upper end of the boom (FIGS. 37).
  • FIG. 8 The arrangement of FIG. 8 is utilized when the boom is supposed to lift heavy loads because the tackles insure that the power requirements remain low. Since the improved derrick construction utilizes a single hanger winch, the housing which accommodates this winch is much smaller than the housings of twin Winches in derrick constructions of known design.
  • FIG. 10 illustrates a further modification according to which the rotary member or drum 518 of the capstan 509 is provided with uniformly spaced substantially hemispherical concave depressions 518a which serve as seats for uniformly spaced substantially spherical beads 513:: of a flexible element 513.
  • the flexible element 513 need not be convoluted about the drum 518 because the beads 5132 insure that the flexible element cannot slide with respect to the drum 518 when the latter is driven by the capstan motor in clockwise or anticlockwise direction. It is suflicient if only a portion of the flexible element is provided with beads 513a.
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so thatsaid lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, power-driven rotary capstan means secured to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, guide means provided on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guide means and about said capstan means intermediate said first and second portions thereof and engaging with said capstan means so that, when said capstan means is rotated it entrains the upper portion of said boom along said flexible element toward be secured by for connecting said rotary said guide means or toward said anchoring means while the boom turns about said vertical axis, said boom turning about said horizontal axis
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantiallly horizontal axis; and means for turning said boom about said axes comprising winch means, power-driven rotary capstan means, means for articulately suspending said capstan means on the upper portion of said boom, anchoring means provided on saidsupporting means at one side of said boom, guide means provided on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guide means and about said capstan means intermediate said first and second portions thereof and engaging with said capstan means so that, when said capstan means is rotated it entrains the upper portion of said boom along said flexible element toward said guide means or toward said anchoring means while the boom' turns about said vertical axis, said boom turning about said winch
  • a derrick construction in combination, supporting means; a boom having a lower portion and an .upperportion; means for articulately connecting the lower por-' tion of said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, power-driven capstan means including a rotary member having an axis of rotation coinciding with the axis of said boom, means for connecting said rotary member to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, guide means provided on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guidemeans and about said rotary member intermediate said first and second portions thereof and engaging with said rotary member so that, when said rotary member is rotated it entrains the upper portion of said boom along with said flexible element toward said
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, power-driven capstan means including a rotary member having an axis of rotation substantially perpendicular to and intersecting the axis of said boom, means member to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, guide means provided on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guide means and about said rotary member intermediate said first and second portions thereof and engaging with said rotary member so that, when said rotary member is rotated it entrains the upper portion of said boom along.
  • power-driven capstan means including a rotary member
  • support ing means; a boom having a lowerportion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, power-driven capstan means including a rotary member having an axis of rotation substantially perpendicular to and oflset with respect to the axis of said boom, means for.
  • a derrick construction in combination, supportingmeans; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, capstan means including a hollow rotary member, motor and transmission means mounted in and drivingly connected with said rotary member, means for connecting the capstan means to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, guide means provided, on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guide means and about said rotary member intermediate said first and second portions thereof and engaging with said rotary member so that, when said rotary member is driven by said motor means it entrains the upper portion of said
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning saidboom about said axes comprising winch means; capstan means including a rotary member mounted on the upper portion of said boom, motor and transmission means mounted in the upper portion of said boom and drivingly connected with said rotary member, anchoring means provided on said supporting means at one side of said boom, guide means provided on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about 2?; said guide means and about said rotary member inter?
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; means for turning said boom about said axes'comprising winch means, capstan means comprising a power-driven rotary member secured to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, guide means provided on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guide means and convoluted about said rotary member intermediate said first and second portions thereof so that, when said rotary member is driven it entrains the upper portion of said boom along said flexible element toward said guide means.
  • capstan means comprises a cage Iotatably receiving said rotary member and supporting said guide rolls, said guide rolls extending substantially radially of and having axes substantially perpendicular to the axis of said rotary member.
  • supporting means in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, capstan means comprising a power-driven rotary sprocket secured to the upper portion of said boom, anchoring means provided on said supporting means at one side of said. boom.
  • capstan means including a power-driven rotary member secured to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, first tackle means including pulley means secured to said anchoring means, second tackle means including guide pulley mean-s secured to said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element mounted on said first and second tackle means and passing about said guide pulley means and about said rotary member intermediate said first and second portions thereof so that, when said rotary member is driven it entrains the upper portion of said boom along said flexible element toward said guide pulley means or toward
  • supporting means including an upright mast and a cross tree secured to said mast; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said mast at a level below said cross tree so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, power-driven rotary capstan means secured to the upper portion of said boom, anchoring means provided on said cross tree at one side of said boom, guide means provided on said cross tree at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guide means and about said capstan means intermediate said first and second portions thereof and engaging with said capstan means so that, when said capstan means is rotated it entrains the upper portion of said boom along said flexible clement toward said guide means or toward said anchoring means while the boom turns about said vertical
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, capstan means comprising a power-driven rotary member secured to the upper portion of said boom and having uniformly spaced concave peripheral seats, anchoring means provided on said supporting means at one side of said boom, guide means provided on said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element having a plurality of uniformly spaced substantially spherical beads and passing about said guide means and about said rotary member intermediate said first and second portions thereof, said beads received in the seats of said rotary member whereby, when said rotary member is driven it entrains the upper portion of said boom along said flexible element toward said guide means or
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so that said lower portion is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, power-driven rotary capstan means secured to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, a guide pulley provided on said supporting means at the other side of said boom, and a single flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said winch means, said flexible element passing about said guide pulley and about said capstan means intermediate said first and second portions thereofi and engaging with said capstan means so that, when said capstan means is rotated it entrains the upper portion of said boom along said flexible element toward said guide pulley or toward said anchoring means while the boom turns about said vertical axis, said boom turning about said horizontal axi
  • a derrick construction in combination, supporting means; a boom having a lower portion and an upper portion; means for articulately connecting the lower portion of said boom to said supporting means so that the boom is turnable about a substantially vertical axis and about a substantially horizontal axis; and means for turning said boom about said axes comprising winch means, capstan means including a power-driven rotary member secured to the upper portion of said boom, anchoring means provided on said supporting means at one side of said boom, first three-fold tackle means ineluding pulley means secured to said anchoring means, second three-fold tackle means including guide pulley means secured to said supporting means at the other side of said boom, and a flexible element having a first portion secured to said anchoring means and a spaced second portion secured to said Winch means, and flexible element mounted on said first and second tackle means and passing about said guide pulley means and about said rotary member intermediate said first and second portions thereof so that, when said rotary member is driven it entrains the upper portion of said boom along said flexible

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Jib Cranes (AREA)
US158471A 1960-12-13 1961-12-11 Derrick construction Expired - Lifetime US3079006A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260373A (en) * 1964-07-17 1966-07-12 Kuribayashi Sadatomo Marine derrick with slack-free guy rigging
US3261475A (en) * 1964-04-09 1966-07-19 Laudan Friedrich Hoisting equipment for ships
US3353685A (en) * 1966-07-11 1967-11-21 Newport News S & D Co Cargo handling apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3261475A (en) * 1964-04-09 1966-07-19 Laudan Friedrich Hoisting equipment for ships
US3260373A (en) * 1964-07-17 1966-07-12 Kuribayashi Sadatomo Marine derrick with slack-free guy rigging
US3353685A (en) * 1966-07-11 1967-11-21 Newport News S & D Co Cargo handling apparatus

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