GB2111458A - Maritime crane - Google Patents

Maritime crane Download PDF

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Publication number
GB2111458A
GB2111458A GB08137902A GB8137902A GB2111458A GB 2111458 A GB2111458 A GB 2111458A GB 08137902 A GB08137902 A GB 08137902A GB 8137902 A GB8137902 A GB 8137902A GB 2111458 A GB2111458 A GB 2111458A
Authority
GB
United Kingdom
Prior art keywords
main boom
crane
base frame
pedestal
boom
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.)
Withdrawn
Application number
GB08137902A
Inventor
Hendrik Willem
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.)
GRAY MACKENZIE TECHNICAL SERVI
Original Assignee
GRAY MACKENZIE TECHNICAL SERVI
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 GRAY MACKENZIE TECHNICAL SERVI filed Critical GRAY MACKENZIE TECHNICAL SERVI
Priority to GB08137902A priority Critical patent/GB2111458A/en
Priority to BR8207275A priority patent/BR8207275A/en
Publication of GB2111458A publication Critical patent/GB2111458A/en
Withdrawn legal-status Critical Current

Links

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
    • B66C23/18—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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

A crane specifically designed for maritime use for deck mounting comprises a pedestal (10) and a base frame (12) rotatable about a vertical axis relative to the pedestal (10). The base frame (12) supports a telescopically collapsible main boom (22) in a manner permitting pivotal movement about a horizontal axis (24). Hydraulic cylinders are provided for extending and retracting the telescopic main boom (22) and hydraulic cylinders (6) are also provided for raising and lowering the boom (22). A pulley (26) is mounted at the free end of the main boom (22) and a single line (28) is guided over the pulley (26) for carrying loads. The line (28) is wound about a constant tension winch (16) mounted on the base frame (12). As shown, with the boom (22) horizontal, the constant tension winch (16) is snugly received between cranked end (20) of the boom (22) and a raised support strut (18), while an operator's cabin may be mounted on the base frame (12), which may rotate through 360 DEG . <IMAGE>

Description

SPECIFICATION A crane The present invention relates to a crane specifically designed for maritime use for deck mounting.
According to the present invention, there is provided a crane having a pedestal, a base frame mounted on the pedestal for rotation about a vertical axis, a telescopically collapsible main boom mounted on the base frame for pivotal movement about a horizontal axis, hydraulic cylinders for extending and detracting the telescopic main boom, hydraulic luffing cylinders for raising and lowering the boom on, a pulley mounted at the end of the main boom and a single line guided over the pulley for carrying loads and wound about a constant tension winch mounted on the base frame.
Preferably, the end of the line is arranged adjacent the pivotal axis of the main boom whereby the tension in the line does not change as the main boom is raised and lowered.
Advantageously, the end of the main boom connected to the base frame is cranked and the base frame includes a raised support strut pivotably connected to the cranked end of the main boom whereby in the horizontal position the main boom is parallel and spaced from the pedestal with the lifting winch accommodated in the space between the horizontal section of the main boom and the pedestal.
The invention will now be described further, by way of example, with reference to the accompanying drawings, in which Figure 1 shows a view of a crane in accordance with the invention disposed with the main boom horizontal and Figure 2 is a more schematic representation showing the main boom in the raised position.
The crane comprises a pedestal 10 and a base frame 12 rotatable about a vertical axis relative to the pedestal 10 by the action of a slewing ring 14.
The base frame incorporates a generally horizontal section which supports a constant tension winch 1 6 and has a vertically extending strut 1 8 on which the crank end 20 of the main boom 22 is pivotably mounted for pivoting about a horizontal axis 24. The rotation of the main boom about the axis 24 is effected by luffing cylinders 26 which are hydraulically operated.
The main boom 22 is itself telescopically collapsible and comprises two sections 22a and 22b. Hydraulic cylinders provided within the section 22a extend and retract the second section 22b.
The section 22b of the main boom carries at its far end a pulley 26 over which a single line 28 is guided the line carrying a hook 30 at one end and being wrapped around the constant tension winch 16 at the other end. Figure 1 shows the main boom arm in its horizontal position wherein it can be seen that the constant tension winch 1 6 is snugly received between the base frame and the main boom. Figure 2 shows schematically the attitude adopted by the main boom in its vertical position.
The slewing ring enables the crane to be rotated by 3600 and since the winch is mounted on the base frame for rotation with the frame the lifting mechanism places no constraint on the rotation of the crane. Because only one line is used, the crane does not suffer from the problem of the lines becoming entangled in the event of rotation of the load connected to the hook 30.
The described crane offers several advantages which are particularly important in maritime use.
In particular, the crane presents a low silhouette and therefore a low centre of gravity and can operate in a horizontal position on most lifts in order to reduce pendulum action. This construction also allows for tent protection of cargo and load in adverse weather conditions.
The crane offers compact storage with hydraulic control of all crane functions. This in turn allows prompt shut down with minimum securing and less deck space is required.
The crane is capable of rotation continuously from 3600. If desired, the slewing may be done hydraulically with cushioned stops and starts in order to reduce pendulum action. An operator's cabin may conveniently be provided on the turntable portion of the base frame affording excellent visibility of all crane operations. In particular the operator may view all hook applications ahead and the cabin rotates through 3600 together with the crane.
Claims (Filed 16 Dec 1982) 1. A crane having a pedestal, a base frame mounted on a pedestal for rotation about a vertical axis, a telescopically collapsible main boom mounted on the base frame for pivotal movement about a horizontal axis, hydraulic cylinders for extending and detracting the telescopic main boom, hydraulic luffing cylinders for raising and lowering the boom, a pulley mounted at the end of the main boom and a single line guided over the pulley for carrying loads and wound about a constant tension winch mounted on the base frame.
2. A crane as claimed in claim 1, wherein the end of the line is arranged adjacent the pivotal axis of the main boom whereby the tension in the line does not change as the main boom is raised and lowered.
3. A crane as claimed in claim 1 or 2, wherein the end of the main boom connected to the base frame is cranked and the base frame includes a raised support strut pivotally connected to the cranked end of the main boom whereby in the horizontal position the main boom is parallel and spaced from the pedestal with the lifting winch accommodated in the space between the horizontal section of the main boom and the pedestal.
4. A crane as claimed in any preceding claim, wherein the base frame is mounted on the pedestal by means of a slewing ring which enables the crane to by rotated by 3600.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A crane The present invention relates to a crane specifically designed for maritime use for deck mounting. According to the present invention, there is provided a crane having a pedestal, a base frame mounted on the pedestal for rotation about a vertical axis, a telescopically collapsible main boom mounted on the base frame for pivotal movement about a horizontal axis, hydraulic cylinders for extending and detracting the telescopic main boom, hydraulic luffing cylinders for raising and lowering the boom on, a pulley mounted at the end of the main boom and a single line guided over the pulley for carrying loads and wound about a constant tension winch mounted on the base frame. Preferably, the end of the line is arranged adjacent the pivotal axis of the main boom whereby the tension in the line does not change as the main boom is raised and lowered. Advantageously, the end of the main boom connected to the base frame is cranked and the base frame includes a raised support strut pivotably connected to the cranked end of the main boom whereby in the horizontal position the main boom is parallel and spaced from the pedestal with the lifting winch accommodated in the space between the horizontal section of the main boom and the pedestal. The invention will now be described further, by way of example, with reference to the accompanying drawings, in which Figure 1 shows a view of a crane in accordance with the invention disposed with the main boom horizontal and Figure 2 is a more schematic representation showing the main boom in the raised position. The crane comprises a pedestal 10 and a base frame 12 rotatable about a vertical axis relative to the pedestal 10 by the action of a slewing ring 14. The base frame incorporates a generally horizontal section which supports a constant tension winch 1 6 and has a vertically extending strut 1 8 on which the crank end 20 of the main boom 22 is pivotably mounted for pivoting about a horizontal axis 24. The rotation of the main boom about the axis 24 is effected by luffing cylinders 26 which are hydraulically operated. The main boom 22 is itself telescopically collapsible and comprises two sections 22a and 22b. Hydraulic cylinders provided within the section 22a extend and retract the second section 22b. The section 22b of the main boom carries at its far end a pulley 26 over which a single line 28 is guided the line carrying a hook 30 at one end and being wrapped around the constant tension winch 16 at the other end. Figure 1 shows the main boom arm in its horizontal position wherein it can be seen that the constant tension winch 1 6 is snugly received between the base frame and the main boom. Figure 2 shows schematically the attitude adopted by the main boom in its vertical position. The slewing ring enables the crane to be rotated by 3600 and since the winch is mounted on the base frame for rotation with the frame the lifting mechanism places no constraint on the rotation of the crane. Because only one line is used, the crane does not suffer from the problem of the lines becoming entangled in the event of rotation of the load connected to the hook 30. The described crane offers several advantages which are particularly important in maritime use. In particular, the crane presents a low silhouette and therefore a low centre of gravity and can operate in a horizontal position on most lifts in order to reduce pendulum action. This construction also allows for tent protection of cargo and load in adverse weather conditions. The crane offers compact storage with hydraulic control of all crane functions. This in turn allows prompt shut down with minimum securing and less deck space is required. The crane is capable of rotation continuously from 3600. If desired, the slewing may be done hydraulically with cushioned stops and starts in order to reduce pendulum action. An operator's cabin may conveniently be provided on the turntable portion of the base frame affording excellent visibility of all crane operations. In particular the operator may view all hook applications ahead and the cabin rotates through 3600 together with the crane. Claims (Filed 16 Dec 1982)
1. A crane having a pedestal, a base frame mounted on a pedestal for rotation about a vertical axis, a telescopically collapsible main boom mounted on the base frame for pivotal movement about a horizontal axis, hydraulic cylinders for extending and detracting the telescopic main boom, hydraulic luffing cylinders for raising and lowering the boom, a pulley mounted at the end of the main boom and a single line guided over the pulley for carrying loads and wound about a constant tension winch mounted on the base frame.
2. A crane as claimed in claim 1, wherein the end of the line is arranged adjacent the pivotal axis of the main boom whereby the tension in the line does not change as the main boom is raised and lowered.
3. A crane as claimed in claim 1 or 2, wherein the end of the main boom connected to the base frame is cranked and the base frame includes a raised support strut pivotally connected to the cranked end of the main boom whereby in the horizontal position the main boom is parallel and spaced from the pedestal with the lifting winch accommodated in the space between the horizontal section of the main boom and the pedestal.
4. A crane as claimed in any preceding claim, wherein the base frame is mounted on the pedestal by means of a slewing ring which enables the crane to by rotated by 3600.
5. A crane as claimed in claim 4 comprising control means for hydraulically operating the slewing ring with cushioned stops and starts.
6. A crane as claimed in any preceding claim, comprising an operator's cabin mounted on the base frame.
7. A crane substantially as hereinbefore described with reference to the accompanying drawings.
GB08137902A 1981-12-16 1981-12-16 Maritime crane Withdrawn GB2111458A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08137902A GB2111458A (en) 1981-12-16 1981-12-16 Maritime crane
BR8207275A BR8207275A (en) 1981-12-16 1982-12-14 CRANE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08137902A GB2111458A (en) 1981-12-16 1981-12-16 Maritime crane

Publications (1)

Publication Number Publication Date
GB2111458A true GB2111458A (en) 1983-07-06

Family

ID=10526647

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08137902A Withdrawn GB2111458A (en) 1981-12-16 1981-12-16 Maritime crane

Country Status (2)

Country Link
BR (1) BR8207275A (en)
GB (1) GB2111458A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408111A1 (en) * 1989-07-13 1991-01-16 Huisman Special Lifting Equipment B.V. Hoisting crane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408111A1 (en) * 1989-07-13 1991-01-16 Huisman Special Lifting Equipment B.V. Hoisting crane

Also Published As

Publication number Publication date
BR8207275A (en) 1983-10-18

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)