US2929515A - Mast constructions - Google Patents

Description

March 22, 1960 A. E. HALLEN 2,929,515 MAST cons'mucnons Filed July 11. 1957 United States Patent MAST CONSTRUCTIONS Alf Eskil Halln, Gothenbnrg, Sweden Application July 11, 1957, Serial No. 671,349 Claims priority, application Sweden July 30, 19 56 3 Claims. (Cl. 212-32 It has been previously suggested to provide the derricks of ships with two topping-lifts the attachments of which to the mast or the like are located in difierent athwartship and longitudinal planes, resulting in a simple operation of the derrick which merely by operation of one of the topping-lifts can be swung to and fro over the hatchway and quay or the like. To this end the mast, derrick pole or the like is provided with a longitudinally extending outrigger which supports a block system for one of the topping-lifts, the arrangement being such that the attachment of said topping-lift to the mast is located in an athwartship plane other than the athwartship plane in which the other topping-lift is attached to a derrick pole or the like located transversely of the mast.

The object of the present invention is a further development of the above-named arrangement, the invention being substantially characterized by the fact that the outrigger is adapted to be swung in a vertical plane. As a result thereof, the derrick is given an increased possibility of vertical movement such that the cargo hook hanging from the derrick head can be moved to any desired place, within a greater range than hitherto possible, merely by winding or unwinding of only one of the topping-lifts.

The invention is described more closely below with reference to the annexed drawings which illustrate one form of construction of the invention. Fig. l is an elevation of a so-called bipod-mast viewed in the longitudinal direction of the ship, Fig. 2 a lateral view of the top part of the mast, and Fig. 3 a top view of the mast according to Figs. 1 and 2.

Fig. 1 illustrates a bipod-mast having inclined legs 1. At the junction of the legs the mast is connected with two transverse Outriggers 2 which at their free ends are provided with devices, not shown, such as leading blocks for topping-lifts which from the blocks extend downwards to rope brakes mounted on the deck and having locking means for the topping-lifts.

According to Figs. 2 and 3,, the mast further has two longitudinal outriggers 3 extending in opposite directions and adapted to be swung in a vertical plane around horizontal pivots 4 on the mast. In Fig. 2, the outriggers 3 are shown in their lowermost horizontal positions in which the lower parts of the bracket-shaped Outriggers abut against the mast.

At the end of each outrigger 3 there are provided two leading blocks 5 and 6. The leading block 5 is mounted on a bracket 7 having a tubular shaft adapted to be turned around its axis which is located at right angles to the axis of the leading block 6. A further leading block 8 is mounted near the pivot 4.

A derrick 9 diagrammatically indicated in Fig. 1 is articulated midships to the lower part of the mast.

Two topping- lifts 10 and 11 are attached to the head of the derrick 9. It is assumed that the length of the topping-lift 10 is constant, said topping-lift being locked by the rope brake on the deck. The other topping-lift 11 runs over the leading block 5, through the shaft of the bracket 7, and over the leading blocks 6 and 8 down to a winch mounted on the deck preferably close to the mast.

If the length of the topping-lift 11 is increased, thederrick will be lifted and the. outrigger 3 will be swung about its pivot 4. The cargo hook hanging from the derrick will then be moved lengthwise in the hatchway;

Due to the swinging movement of the outrigger 3 and the arrangement of the parts described, the stresses acting on the derrick and the topping-lift will not amount to unsafe values during the last-named lifting movement.- If the topping-lift at the left-hand end of the outrigger 2, as viewed in Fig. 1, is attached to the derrick 9, it

is possible to swing the derrick to either side from the central position. In the last-named position in whichthe derrick is supported merely by the central topping-lift 11 and preferably assumes a relatively high position, either of theside topping-lifts may be locked in its rope brake and may be given any suitable length such as to obtain the desired path of movement of the cargo hook. The operation may be facilitated by applying marks to the side topping-lifts corresponding to marks, for instance on the hatch coaming. If the topping-lift is locked at the place of a certain mark, the operator then knows in advance exactly where the hook will be when the side topping-lift becomes taut as the derrick is lowered by increasing the length of the central topping-lift.

The invention is not limited to the form of construction illustrated and described. If it is desired to avoid bending of the topping-lift in different directions over the leading blocks 5 and 6, the leading block 6 may be placed outwardly of the shaft of the bracket 7, in which case the topping-lift may run through an angle of about 270 over the block 6 in the same direction as over the block 5. The invention may also be applied to pairwise arrangement derricks and, if desired, in combination with a central heavy-load derrick. In this case, the outrigger 3 may be divided along a vertical plane and the pairwise arranged derricks may be separately connected to the parts of the outrigger and may be operated independently of each other for loading and unloading over both sides of the ship. When the heavy-load derrick is to be used, the two outrigger parts are connected to each other. In a construction according to the invention, manually operated ropes or vang pendants may be used to increase the range of action of the cargo hook beyond the range which is obtained by operation of the topping-lift alone.

What I claim is:

1. A cargo handling derrick apparatus for a ship comprising a vertical cargo mast, a derrick pivotally connected at its lower end to said mast intermediate the ends thereof for swinging movement in both the vertical and horizontal directions, a transverse outrigger secured to the upper end of said mast, said transverse outrigger being substantially horizontal and extending transversely of the ship, a longitudinal outrigger pivotally connected to the upper end of said mast for movement in a vertical plane parallel to the longitudinal axis of the ship, a first topping lift of constant length connecting the upper portion of said derrick to one end of said transverse outrigger, and a second topping lift of variable length connecting the upper portion of said derrick to one end of said longitudinal outrigger.

2. A cargo handling derrick apparatus for a ship com- Patented Mai-.22, 1960 pi'ising aver-neat cargo mast, a derrick pivotally Galatians 7 are lowerend to said mast intermediate the ends thereof for swinging movement in both the vertical and horizontal directions, a transverse outrigger secured to the upperrendof said? niast', said transverse outrigger;

being substantially horizontal and extending voutwardly from .sflidgmast transversely, of the ship, a .firstfltopping lift of constant length connecting the upper portionof said derrick to the free end of said transverse outrigger,

aJongitudinal outrigger pivotally connected to the upper end or said mast for movementina .vertical plane paralleltorthe longitudinal axis of the ship, a first leading block. pivotally, connected vto the upper surface of an extremity, ofrsaid longitudinal outrigger for pivotal move ment, about a substantially :vertical pivotraxis, a second leading block connected to. the underfsurface of said block pivotally connected to, the upper surface of an extremity of said longitudinal outrigger for pivotal movement about a substantially vertical pivot axis, a second leading; block connected to the under surface .of said longitudinal outrigger opposite said first leading block,

- and a third leading block connected adjacent the pivotal longitudinal outrigger opposite said firstrleading 'blockf' anda third leading blockcon'nected to. said longitudinal outrigger adjacent the pivotal connection of said outrigger to saidmast, and a second top-lift of variable length "extending successively over said third, second and first leading blocks to the upper portion of said derrick, whereby:swinging movement of said derrick is controlled by the lengthrof said second top lift.

VA cargo handling derrick apparatusfor a ship com 25 prising a vertical carg'omast, a .derrick pivotally connected at its lower. end to said mast intermediate the ends thereof for swinging movement in both the vertical and horizontal directions, a transverse outrigger secured toconnection of said outrigger to said mast, a second toplift of variable length extending successively over said third, second and first loading blocks for connection to the upper portion of said derrick, and means for adjusting the lengthof saidsecond top lift to efiect swinging movement of said derrick and vertical pivotal movement of said longitudinal rigger.

References Cited in the file of this patent UNITED STATES PATENTS 1 515,941 Adams Dec. 13, 1898 1,856,907' Chapman May 3, 1932 2,613,001 Green a Oct. 7, 1952

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