US2361053A

US2361053A - Ship cargo rig

Info

Publication number: US2361053A
Application number: US502420A
Authority: US
Inventors: Clifford M Pedersen; Shirley L Morgan
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-09-15
Filing date: 1943-09-15
Publication date: 1944-10-24
Anticipated expiration: 1961-10-24

Description

Oct. 24, 1944-. c. M. PEDERSEN ET AL SHIP CARGO RIG 2 Sheets-Sheet 1 Filed Sept. 15, 1945 //V VENTU/FS mm ER wO M L DY mm FR m as z Arm/W75 0a. 24, 1944. PEDERSEN ETAL 2,361,053

SHIP CARGO RIG Filed Sept; 15, 1943 2 -Sheets-'-Sheet 2 INVE/VTUAS CLIFFORD M. PEDERSEN SHIRLEY L. MORGAN 5/ deck equipment Patented Oct. 24, 1944 snn CARGO RIG Clifford M. Pedersem San Francisco, and Shirley L. Morgan. Sausalito, Calif.

Application September 15, I943, Serial No. 502,420 7 2 Claims. (Cl. 212-3) The present invention relates to ships cargo hoist rigs of the type employed in loading and unloading operations.

One of the objects of this invention is to provide a simplified hoisting ri which will utilize conventional deck installations of booms and Winches andefiect certain economies of operation as well as greatly speed up the cargohandling operations.

It is a well known fact that the tempo of the present World war dictates that speed is of, the essence and this is particularly true in the transportation of cargo by ship. Acceleration of cargo handling while war inspired is susceptible of peacetime application. It is therefore one of the primary objects of this invention to adapt the presently employed to a simplifiedform of apparatus-capable of increasingca pacity in a substantial degree. Additionally, it is an object of this invention to provide an improved hoisting 'rig' whichfwill be easy to operate and thus avoid the necessity ,of prolonged instruction to operators trained along conventional lines.

In general termsthe objects of this invention are attained throughthe use of two falls, one of Which may be designated a power' fall and the other of Which may beterined the guide fall,

which engage-"independent drum means for the raising, movement and lowering'ofcargo or slings of the same. Moreover, the invention contemplates that theguide fall carry at its free end a sheave or other direction changing means over which the power fallis passed to facilitate the load guiding operation. z

It has been standard practice in handling ships cargo to employ two power falls connected to independent winches, each passed over a boom-supported sheave and terminating in their respective common connections to a weighted sling hook or, as it is termed in maritime practies, the blacksmith. .When the blacksmith is lowered away into the ships hold through the cargo hatch, both of the respective winches are reversed to slack the connected falls. In the raising operation, however poweris initially ap -v plied only to the winch actuating the first fall, namely, the fall on the :boom over the hatch to raise the load clear of the .hatch coaming while the slack of the companion, or' second fall, is taken up by application of power to the winch to which it is connected.

When the load is clear of the hatch coaming, power is applied to the second fall to move the load laterally toward ship side while the power on the first fall is 'slackedofi. As the weight of the load passes through equilibrium between the two falls the full weight shifts from the first to the second fall"and"power mustlbe exerted on the latter to sustain and lower the load to dock or lighter.

As a consequence'of this conventional prac tice, it is necessary to employ two power winchesfor each sling hook or blacksmith despite the fact that fifty per cent of'the time each of them is idle. In thepresent inventiona single power winch will serveeach unitary rig since the guide fall requires but a minimum of. power-and may therefore beactuated by drum or pulley auxiliary to the main winch drum. I a In the accompanying drawings wherein preferred forms of the invention are shown; as examples, e f Figure 1 'is a side elevation of a cargo rig op: erating from a single winch means, and

Figure 2 is'a sideelevationlof. a pair of the cargo rigs of Figure 1 working-a single hatch with the aid of companion winches. I In the single rigform shown in Figure 1v the letter A designates the power or load sustaining fall, wound 'on'the drum ll] of the winch H and passing through-a directionchanging sheave l2 anchored on theships. deck. [3. Fall A is next passed through a block l8 pivotally connected to ,a collar l9 adjacent thetip of boom l5, through sheave 20 at the free end of fall B, and. terminating in its connection to a cargo hook 2|. In

lieu of the usual blacksmith a ball weight 22 is provided on fall A in proximity to hook 2]..

Fall B is the guide fall having its inner end wound on pulley'25 on winch ll, passing through sheave 26 on. deck l3, thence through block 21 at the foot of boom 28, bl0ck 29 at the tip of boom 28 and terminating in a swiveled connection,- to sheave 20. l. a

In the formillustrated winch l I may consist of a parallel pair of double ended steam driven pistons in the housing 35, operatively connected to the drum l0 and-drum 25, and provided with independent controls 36 and 31, respectively. It will be understood that the particular form of the winch means is winch equipped with a main-power drum and an auxiliary pulley'means, independently driven or engageable with the main winch by clutch means and provided with braking means, will serve to carry out the purpose of the invention.

Moreover, the invention contemplates that standard practices will be carried out in the guy rigging of the booms l5 and 28 for their support not critical as any type of or stationary position permitting the free of fall A. When a load has been secured on hook 2|, contro1 36 is set in its forward or takeup position and thus power isv applied to fall- A to raise the load vertically. When the load has been raised to a satisfactory height relation to the hatch coaming, control lever 36 is returned to neutral position thus holding" "the load above the .hatch.. Control lever 31 is 1 then set itsj forward. or takeup position to draw fall B andjthe sheave: 20 I carried thereby toward boom 28 andqshipside. Simultaneously control lever '36 is'set at reverse position to'slack off fall A consistently with the'speed of movement of the loadin the directionnof shipside. 'It will be understood, of course that boom 28 will be disposed, at jsuflicient' angle to project beyond shipsidetso thata load'suspended therefrom will clear for deposit on dockj or lighter. When'the takeup on fall Bv has moved sheave 2D sufliciently toward boom lt topermit the load to clear shipside, controlleverjlisf returned to neutral position and sheave 20' is thereby he1d in fixedflrelation to boom 28 a though secured thereto. Continuing slacking oiffof' fall Awill permitproper deposit of the load.

In the double rig illustrated in Figure 2' of the drawings, it will be noted that we contemplate the use ofpower falls hand and guide falls B and D. Similarlyfwe' employ, the companion winches 4| and flgcorre'sponding to the single winchl l ofFi'gure'l. V

I In this modification power fall A is passed over pulley .43 collared adjacentthe top' of boom |5, thence through the pulley 44 at the foot of 'the' saidboom, through the direction changing blockfli and is wound onthe drum 46 of winch 42. s Guide fall B passes over pulley 49 collared adjacent the top of boom 28,thence over pulley 50 at .the, foot of said boom, through the direction changingiblock SI and is wound on the drum 52 ofwinchlZ. l I, oppositely, power fall C'is passed over a pulley 56 fixed atthe top of'bcom 28, thence through pulley ;'|,at the foot of the said boom, through the direction changingblock 58 f-or winding on the drum 59 d f' winch 4|. The companion or guide fall D is passed over pulley 62 disposed at the topofboom l5 thence through pulley 63 at the foot of said boom, through the direction changing block for winding on drum 65 of winch; I g

It will be appreciated; 0! course, that the winches 4| and 42 are provided with the dual controls 38 andfl3l as in the case of the winch H. Likewisefit will be understood that each of the power falls, A and C, are equipped with ball weights 2! and cargo hooks 2| and that said falls pass through the direction changing sheaves 20 at the ends of the respective guide falls B and D, respectively. p The companion rigs are equipped in the manner of the single rig of Figure 1 in that pulleys 20 are disposed at the free ends of guide falls B and D while power falls A and C are each provided with ball weights 2| and cargo hooks 20. In operation, the double rig contemplates the bypassing of, the cargo hooks disposed at the ends of the falls A and C. In an unloading operation and as illustrated in Figure ,2, hook 2| on power fall A is raising a box and having cleared I the hatch, control lever 36 of winch 42 will be set in reverse position to slack oil on power fall- A asguide fall B is wound on drum 52 sufficiently to draw the cargo 10 in the direction of boom 28 to clear shipside where it may be lowered away.

Meanwhile, control lever 31 of winch 4| may be set in its forward or takeup position to pull guide fall Doverthe hatch while lever 36 of Winch 4| is positioned to slack often-power fall C to lower the hook 2| carried'thereby into-the hold for load- Obviously the loading or unloading operation from a single-hatch can be materially speeded up through the use of the, double hook rig in Figure 2 015 the drawings. What is more, by utilizing the novel features of our invention with the conventional installation of twin winches at each hatch, the speed-up of loading can be achieved at a minimum cost. 1

While,,as illustrated, drums I0 and 25 of winch (Figl); and drums and 52 of winch 42 and drums and 59 of winch '(Fig. 2) are shown as positively drivenby common shafts, the rotation of which iscontrolledby levers 36 and 31, it beunderstood-that it is within the purview of ourinvention to substitute conventional clutch and backing means inconnection with the drums 25;, 52 and, respectively, to permit taking up or slacking off of the guide falls independently of the application'of power to power falls A and C.

Having thus shown and described our invention, what we desire to secureby'grant of Letters Patentis: t v

1. A ship cargo rigcomprising, a power fall, a guide fall, a sheave connectionbetween the operative end ofthe guide fall and the power fall, boom means providing separate elevated support for the said power and guide falls, pulley blocks on the boom means to effect change of directiontof the respective falls, and winch means for selectively taking up or slacking ofi the respective power and guide falls. v v

2, A ship cargo rig comprising,- a pair of power falls, a pair ofguide falls, sheave means disposed at the operative ends of each of the respective guide falls providing aVrun-ning connection for each of the power falls,.boom means providing a common elevated support'for .a power fall and a guide fall, pn'lley'fblocks on theboom means to eifect change of direction of the respective falls, and winch means for selectively taking up or slacking'ofl' the respective power and guide falls.

CLIFFORD M. PEDERSEN. SHIRLEY L. MORGAN.