US3260373A

US3260373A - Marine derrick with slack-free guy rigging

Info

Publication number: US3260373A
Application number: US431579A
Authority: US
Inventors: Kuribayashi Sadatomo
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-07-17
Filing date: 1965-02-10
Publication date: 1966-07-12
Anticipated expiration: 1983-07-12
Also published as: GB1067254A

Description

y 12, 1966 SADATOMO KURIBAYASHI 3,260,373

MARINE DERRICK WITH SLACK-TREE GUY RIGGING Filed Feb. 10, 1965 2 Sheets-Sheet 1 IN VENTOR SADATOMO KURI BHYASH/ BY M407 Ma! HIS l9 TTORNE Y5 y 1966 SADATOMO KURIBAYASHI 3,260,373

MARINE DERRICK WITH SLACK-FREE GUY RIGGING Filed Feb. 10, 1965 2 Sheets-Sheet 2 INVENTOR.

SRDATOMO K UR/B/IYHSH/ HIS l7 "OR/YE YS United States Patent 3,260,373 MARINE DERRICK WITH SLACK-FREE GUY RIGGING Eladatomo Kuribayashi, 2111 Z-chome, Kakinokizaka, Meguro-kn, Tokyo, Japan Filed Feb. 16, 1965, Ser. No. 431,579 Claims priority, application Japan, July 17, 1964, 39/40,163, 39/40,164 2 Claims. (Cl. 212-3) The present invention relates to a marine derrick arrangement, more particularly, to a marine derrick arrangement wherein a pair of guy pendants are connected to a topping lift at a point adjacent to an unsupported end of a derrick boom at one end thereof and wound around separate drums of a common winch at the other end thereof, running through a pair of sheaves located in both sides of the winch.

In a prior art derrick arrangement, two guy pendants are usually wound around two different winches with different tension, often with one of them entirely slackened, hence two winches or one winch combined with a counterweight are required for handling both guy pendants and heavy vibration of a derrick boom is involved due to slack guy pendants, causing a serious damage to equipments and cargo.

According to the present invention, each of two guy pendants is connected to a free end of a topping lift wire through a sheave located adjacent to a top end of a derrick boom at one end thereof and wound around a drum of a single winch with one pendant in a direction opposite to the other, running through a deflecting sheave located outboardly of said winch and said topping lift wire is also Wound around another winch at the other end thereof.

The present derrick arrangement comprises three winches, that is, a first winch intended for a topping lift wire which is adapted to control an inclination of the derrick boom, a second winch for lifting cargo, and a third winch which is designed to be used for controlling both guy pendants as a common unit, a derrick boom pivotally mounted on a gooseneck supported indirectly on a deck,

- a derrick post fixedly mounted on a deck, a pair of guy sheaves located one in each side of the derrick post well aligned therewith and necessary wirings and blocks including a cargo fall, a topping lift and guy pendants which are connected to said topping lift.

Since the present device is constructed as described hereinabove, both guy pendants will be maintained taut at all time by a single winch thereby steadying a derrick boom and reducing vibration of the same during operation, a cargo handling arrangement, particularly those winches intended for guy pendants will be simplified and reduced in number, and time and labour required for operating the whole arrangement and for changing the service arrangement from the starboard to the port side, and vice versa will be greatly reduced.

As described hereinabove, a pair of guy pendants are wound around a pair of identical drums on a common winch in a direction opposite to each other. Hence, in controlling those guy pendants, a paid-out length of one guy pendant from the drum per unit time will be equal to a taken-in length of the other per unit time around another drum, thus keeping a total length of two guy pendants constant at all time as long as they are maintained taut. Now, a locus of points having a constant total distance from two fixed points will delineate an ellipse having a shorter diameter equal to twice the length of the derrick boom (see FIG. 3, curve (b)), whereas actually a locus of an outer end of the derrick boom will delineate a circle having a diameter equal to the length of the derrick boom (see FIG. 3, curve (a)).

3,260,373 Patented July 12, 1966 Consequently, except in a position designated by N in FIG. 3, total length of both guy pendants will become excessive, thus causing a slack wire to occur. According to the present invention, this slackness is adapted to be absorbed by a topping lift by connecting the guy pendants thereto, so that they are maintained taut at all times.

It is a primary object of the present invention to provide a marine derrick arrangement which will enable both guy pendants to be maintained equally taut at all times by eliminating a slack wire thereby preventing a vibration of the derrick system.

Another object of the present invention is to provide a marine derrick arrangement which is simplified and steadied by using an improved guy means.

Still another object of the present invention is to provide a marine derrick means which is easy to handle and which will save man-power greatly in operation in contrast to a prior art means.

Still another object of the present invention is to provide a marine derrick means service of which can be changed immediately from the starboard to port side and vice versa without any alteration or change of the arrangement.

Other objects and advantages of the present invention will become more apparent from the following description taken in connection with the accompanying drawings wherein like numerals refer to like parts throughout and in which:

FIG. 1 is a perspective view showing a preferable embodiment of the marine derrick means according to the present invention;

FIG. 2 is a plan view showing the same;

FIG. 3 is a plan view showing a swinging of the derrick boom;

FIGS. 4 to 6 are plan views showing a connection between a topping lift and guy pendant; and

FIG. 7 is a plan view showing a condition wherein merely one guy pendant in one side is connected to the topping lift wire.

With reference to FIG. 1, by 1 is designated a derrick boom, a base 2 of which is pivotably mounted on a hull structure, 2, 3 show blocks or sheaves provided on top of said boom in the both sides thereof, 4, 5 are deflecting sheaves provided on a hull structure in both sides thereof, said sheaves are well aligned with the base of the derrick boom so that both are symmetrical with reference to said base of the boom. By 6 is designated a winch intended for guy pendants, 7 winding drums thereof. Guy pendants 8, 9 are wound around said drums 7 in such a manner as to have one guy pendants paid out while another one is rolled in. Each of those guy pendants 8, 9 is led to a sheave 2 or 3 respectively on top of the derrick boom through a guy pendant deflecting sheave 4 or 5 located in both sides of the hull structure, and then connected to a topping lift wire 10. Those three

wires

8, 9 and 10 may be connected together, directly as shown in FIG. 4, or by means of a joint fitting 15 such as a ring or a plate or shown in FIG. 5 and FIG. 6 respectively. By 11 is designated a derrick post. Said topping lift wire 10 is led to a winding drum 14 of the winch 13 intended for said topping lift through a topping lift block 12 on top of said derrick post.

According to the present invention which is constructed as described hereinabove, when the guy wire winch 6 is running in order to swing the derrick boom to the right or to the left, the guy wire will be paid out in one side and rolled in to the same amount in the other side.

Now, for instance, for swinging the derrick boom clockwise in FIG. 3, the guy wire winch 6 will be caused to run in such a manner as to roll in said guy pendant wire 9 and to pay out said guy pendant wire 8. By running of said winch 6, the guy wire 9 will be rendered taut and pull the derrick boom 1 clockwise.

However, if any of the guy pendants is not connected to a topping lift but merely secured to the derrick boom 1 at the top end as usual, the more swinging of the derrick boom 1 occurs beyond a central position N, the more slackened is the guy wire 8, and hence the derrick boom 1 will be brought back corresponding to the slacked amount of the guy pendant, thereby causing a vibration of the boom, due to a rolling of the ship or a swinging of the cargo.

According to the present invention, any slackness of the guy pendant 8 will be absorbed by a topping lift which is rendered taut at all times by a weight of the derrick boom 1 and that of a suspended cargo, thereby causing a tension of each guy pendant 8 and 9 to be substantially balanced. At this time, an angle between said derrick post 11 and said derrick boom 1 will be slightly increased but it does not affect the actual operation of the derrick.

The operation will be carried out in the same manner for swinging the boom anticlockwise.

Now, for changing an angle of inclination of the derrick boom, the topping lift wire will be taken in or paid out by means of a topping lift winch 13 in the same manner as in case of an ordinary derrick means. As described hereinabove, in the present invention, since two guy pendants, which are connected to a guy wire winch, are jointed to a single topping lift wire, which is connected to a winding drum of the topping lift winch, through the sheaves 2, 3 on top of the derrick boom 1, a slackness of the guy pendants during a swinging operation is absorbed and hence eliminated by the topping lift all the time, a tension of both guy pendants is always nearly balanced, and the derrick boom will not be shaken by a rolling of ship or by a swinging of cargo thereby assuring safe operation of the derrick boom and simultaneously permitting no impact to be exerted on any of the guy pendants and hence preventing it from being broken.

The accompanying drawings are intended merely for illustrating a principle of the present invention, and a topping lift wire 10, which is connected to both guy pendants 8, 9, may be run doubly around a block 12 and a block (not shown) on a top end of the boom 1 and then led to the winch 13.

Although, as described hereinabove, both guy pendants 8 and 9 are adapted to be connected together to a topping lift 10, either one, for instance, merely one guy pendant 8 may be connected to a topping lift wire 10 with the other guy 9 being secured on an eye piece 20 adjacent to the top end of the derrick boom 1 as shown in FIG. 7, in case of a light cargo or a small angle of inclination of the derrick boom.

When the derrick arrangement according to the present invention is equipped on a small sized ship (about 2,000 gross ton) with its derrick boom located in the centre line of the hull structure and with all control levers of three winches (for a topping lift, for guy pendants and for a cargo fall) concentrated at a control platform, the whole derrick arrangement can be actually controlled by a single operator, thus saving man-power greatly. And a changing of service of the system from port side to starboard side and vice versa will be easily assured without any additional work, which is an inherent feature of the present invention.

Although several embodiments of the invention have been disclosed herein for purposes of illustration, it will be understood that various changes can be made in the form, details, arrangement and proportions of the various parts in such embodiments without departing from the spirit and scope of the invention as defined by the appended claims.

What is claimed is:

1. A marine derrick arrangement comprising a derrick boom, a pair of guy pendant deflecting sheaves aligned with and located at an equal distance on both sides of the base of said derrick boom, a common winch designed for winding two guy pendants, a topping lift wire, said guy pendants being wound around said common winch at one end thereof and led through said guy pendant deflecting sheaves and then through another pair of sheaves mounted on the derrick boom at the top end thereof both then being connected to said topping lift wire, and a winch for taking in said topping lift wire.

2. A marine derrick arrangement as claimed in claim 1, wherein one of said guy pendants is connected to the topping lift at the end thereof and the other pendant is secured on the derrick boom adjacent to the top end thereof.

References Cited by the Examiner UNITED STATES PATENTS 2/1963 Eckhardt 2l23 8/1964 McAsee et a1. 2123 X

Claims

1. A MARINE DERRICK ARRANGEMENT COMPRISING A DERRICK BOOM, A PAIR OF GUY PENDANT DEFLECTING SHEAVES ALIGNED WITH THE LOCATED AT AN EQUAL DISTANCE ON BOTH SIDES OF THE BASE OF SAID DERRICK BOOM, A COMMON WINCH DESIGNED FOR WINDING TWO GUY PENDANTS, A TOPPING LIFT WIRE, SAID GUY PENDANTS BEING WOUND AROUND SAID COMMON WINCH AT ONE END THEREOF AND LED THROUGH ANOTHER PAIR PENDANT DEFLECTING SHEAVES AND THEN THROUGH ANOTHER PAIR OF SHEAVES MOUNTED ON THE DERRICK BOOM AT THE TOP END THEREOF BOTH THEN BEING CONNECTED TO SAID TOPPING LIFT WIRE, AND A WINCH FOR TAKING IN SAID TOPPING LIFT WIRE.