US3887081A - Ball rotation sheave release - Google Patents
Ball rotation sheave release Download PDFInfo
- Publication number
- US3887081A US3887081A US194877A US19487771A US3887081A US 3887081 A US3887081 A US 3887081A US 194877 A US194877 A US 194877A US 19487771 A US19487771 A US 19487771A US 3887081 A US3887081 A US 3887081A
- Authority
- US
- United States
- Prior art keywords
- spreader
- bails
- sheave
- sway
- sheaves
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
Definitions
- the present invention relates to anti-sway devices for inhibiting and arresting sway of a suspended load, and more particularly it relates to a bail rotation sheave release for moving the sway stop sheaves of an anti-sway system upwardly and inwardly.
- the pair of sheaves mounted midway of the spreader headblock are referred to as the sway stop sheaves and are mounted as close as possible to, and slant outwardly from, the side edges of the spreader headblock. Because of the angulation of the wire ropes reeved through these sheaves, it has been found that when loading cargo containers through some ship hatches when the ship is listing due to uneven loading or wave motion, the hoisting ropes reeved through the sway stop sheaves contact the hatch coaming (edges) or the cell guides thereby shortening one of the lines and cocking the container in the guides, as well as causing undue wear of the ropes.
- the container does not hang to gravity for ease of entrance into the cell guides, and ease of sliding in the cell guides, and causes damage to the container corner posts.
- the present invention provides a means for moving the bails on which the sway-stop sheaves of a variable centers rope suspension system are mounted, upwardly and inwardly, to both release the tension in the sway arrest lines, and to provide vertical side clearance for the lines when a spreader is lowered into a ships cell.
- the release means provides a tension release for the sway arrest lines, and vertical side clearance for the lines from cell guides when a spreader is lowering a cargo container into a ships hold.
- Movable bails secure the sway arrest sheaves to the spreader, and a toggle linkage is provided for moving the bails upwardly and inwardly with respect to the spreader from the down position, a power means is provided for moving the toggle linkage to the upward position and for locking the toggle linkage in the down position.
- FIG. 1 is a side elevational view of the present invention showing the reeving arrangement with the swayarrest lines in the down position and lowering a spreader cargo container into a ships cell with the ship listing 2 /2.
- FIG. 2 is a partial view of FIG. 1 showing the swayarrest reeving with the sheaves in the up position.
- FIG. 3 is an end elevation in partial section showing the sway-arrest reeving and sheaves in the locked down position.
- FIG. 4 is an end elevation in partial section showing the sway-arrest reeving and sheaves in the up position
- FIG. 5 is a top plan view of FIG. 3.
- a lifting spreader 11 as supported from the gantry 13 of a cargo container handling crane 15.
- a pair of sway-arrest sheaves 17 are mounted on the 0pposite sides of the spreader generally midway from the ends thereof.
- the lines or wire rope 21, 23 which are reeved through these two sheaves are basically independent sway-arrest lines as far as the lifting spreader is concerned.
- at least two sheaves are utilized with at least one sheave mounted on each side of the spreader.
- the bail rotation sheave release means 25 of the present invention provides a tension release for the sway-arrest lines to permit the spreader and cargo container to hang to gravity when the sheave release means is activated.
- the sheaves are moved upwardly about 12 inches. This removes some of the tension on the lines, but still leaves enough so that the lines contact the sheaves and remain relatively taut and aligned in the sheaves.
- the tension release means permits a cargo container which is being lowered into or removed from the cell guides ofa ship's hold 27 to find its own way in the cell guides and prevents the tension on the sway-arrest lines from rocking the container on its longitudinal axes to thereby create friction within the cell guides.
- the release means prevents the swayarrest lines from cocking the container for any reason, such as when the ship sways due to the wave motion of the water or lists due to uneven loading.
- the sheave release means also moves the sheaves inwardly about 9 inches each toward the center of the lifting spreader, whereby the sway-arrest lines hang closer together to provide vertical side clearance for the lines with respect to the hatch cell coaming and cell guides when the spreader holding a container is being lowered into or removed from a ships hold.
- the bail rotation sheave release means 25 includes a pair of movable bails 29, 31 for securing the swayarrest sheaves to the spreader.
- the bails act as journals in which the sheaves rotate.
- each of the bails are journaled by pins 33, 35 between the ends of a pair of bellcranks 37, 39 which are disposed on opposite sides of the spreader.
- the bails could be secured to a single bellcrank, but in a preferred embodiment, a pair of bellcranks is preferable as it journals each side of the bail for stability and permits smaller size bellcranks to be utilized.
- a pair of these bellcranks is disposed on each side of the spreader to accommodate each of the two bails.
- the bails are disposed or located in their proper position on the opposite sides of the spreader when the bellcranks are located in the down position adjacent the lifting spreader.
- a toggle linkage is provided for moving the bails upwardly and inwardly from the down position with respect to the spreader. Included in this linkage are the bellcranks, and to effect this movement of the bails, those ends opposite the bail connections are journaled to the spreader at 45, 47 and are fixed with respect to the lifting platform. The crank portions of the bellcranks are disposed extending upward with respect to the spreader or platform for effecting upward and inward motion of the bails with respect to the spreader when the release means is actuated.
- the toggle linkage also includes at least one actuation arm 41, 43 for each pair of bellcranks.
- a first end of the actuation arm is journaled to the crank portion of the bellcrank at 49, 51, and the second end to a power means 55.
- a pair of actuation arms are utilized for each of the pairs of bellcranks, and they have their first ends journaled to the respective crank portions of each of the pair of bellcranks.
- the second ends of the actuation arms are, in the preferred embodiment, secured to a common journal.
- One pair of the pairs of actuation arms are journaled to opposite ends of a common shaft 53.
- the pair of actuation arms extending from the opposite pair of bellcranks are bent inward and are secured to a pair of journals mounted on the same common shaft as the other actuation arms, but these journals are both disposed inwardly along the shaft of the two journals of the other actuation arms.
- the power means 55 is provided for moving the toggle linkage to the upward position and for locking the toggle linkage in the downward position.
- the power means is secured to the other or second ends of the actuation arms for moving that end of the actuation arm up or down.
- the power means moves the common shaft 53 of the actuation arms vertically up and down so as to actuate the release means.
- Upward motion of the common journal lifts the inboard ends of the actuation arms to lift the crank portions of the bellcranks and rotate the bellcranks inwardly, thereby lifting and rotating the bails upwardly and inwardly with respect to the spreader or platform.
- the downward motion of the common journal reverses the process to lock the sheaves down.
- a guide means 57 is provided for the ends of the common journal to insure that the journal tracks vertically up and down.
- This guide means is simply a pair of aligned tubular posts 59, 61 disposed at and bracketing the opposite ends of the common shaft, and the ends of the shaft are provided with roller bearings 63, 65 which move between these posts.
- An important feature of the invention is the orientation of the bellcrank and actuation arms when in the down position.
- the actuation arms are disposed substantially aligned with a line drawn between the bail journal axis and the axis of the connection of the actuation arm with the bellcrank when the sheave is disposed in the down position.
- the arm is angled slightly away from the spreader or the platform at its connection with the power means. This prevents the linkage from locking up, and if heavy loads are imposed on the sway-arrest ropes, tending to lift the bail ends of the bellcranks, the actuation arms will be urged toward the up position.
- connection of the actuation arms were aligned with the axis of the bail pin and its journal with the bellcranks, the linkage would lock up. Likewise, if the connection point of the actuation arms with the power means moved below the line, or closer to the spreader or platform, heavy loads on the arrest lines would tend to lock the arms down tighter and prevent them from releasing.
- the bellcrank offset between the connection of the bellcrank with the spreader and the journal axis of the actuation arm with the bellcrank holds the bellcrank in the down position when the power means is locked in the down position and the ends of the actuation arms are held close to the spreader or platform.
- the offset from the axis of rotation of the bellcrank through which the actuation arm operates forms a nearly locked T preventing the bellcranks from rotating inwardly against the resistance of the actuation arm.
- the arm is angled slightly upwards from its connection with the power "means, very large forces exerted upon the bellcrank to lift the outboard ends will permit the two actuation arms to move inwardly and upwardly, if the power means permits.
- a hydraulic circuit having a cylinder is utilized to actuate the mechanism.
- the lower end of the cylinder is secured to the lifting spreader at 67,'and the upper end, or the eye of the connecting rod 69, is secured to the common journal of the actuation arms at the center thereof.
- the system is pumped between the up and down positions by a pump capable of producing approximately 750 psi" in the hydraulic circuit.
- a switch is thrown shutting the hydraulic circuit. This is done by shutting the hydraulic circuit off by valving to isolate the pumping system and form a closed hydraulic circuit.
- This closed circuit includes a relief valve set to a value of approximately 3,000 psi to accomodate overloads.
- the hydraulic system includes a valve means to lock the hydraulic circuit after the power means has moved the release means to either the up or down position.
- the relief valve is included in the hydraulic circuit so that any mechanical overloads in the down position of the sheave bails will cause the relief valve to relax the hydraulic circuit to permit the sheave bails to move toward the up position.
- a bail rotation sheave release means for providing a tension release for the sway arrest lines, and for providing vertical side clearance for said lines from cell guides when a spreader is lowering a cargo container into a ships hold, comprising movcable bails securing said sway arrest sheaves to said spreader,
- a release means for moving a wire rope sheave upwardly and inwardly with respect to a platform and formed to hold the sheave in the down position when so disposed said release means comprising a sheave bail journaled at the free end of at least one bellcrank, the other end of said bellcrank being journaled to said platform with the crank portion of said bellcrank being offset upwardly with respect to said platform, at least one actuation arm having a first end journaled to the crank portion of said bellcrank, and 5 power means secured to the.
- said actuation arm being substantially aligned with a line drawn between the bail journal axis and the axis of the connection of the actuation arm with the bellcrank when the sheave is disposed in the down position, but said arm being angled slightly away from said platform to its connection with the power means so as to prevent the linkage from locking up, the offset between the connection of the bellcrank with the platform and the journal axis of the actuation arm with the bellcrank holding the bellcrank in the down position when the power means urges the end of the actuation arm toward the spreader.
- a bail rotation sheave release means for moving the sheaves upwardly and inwardly with respect to the spreader comprising a pair of sheave bails, each of said sheave bails being 25 journaled between the ends of a pair of bellcranks,
- said bails being disposed at opposite sides of the spreader when in the down position, the opposite ends of said bellcranks from said bails being journaled to said spreader, the crank positions of said bellcranks being disposed upward for effecting upward and inward motion to said bails with respect to said spreader when said release means is actuated to rotate the bellcranks and move the bails from the down to the up position,
- At least one pair of actuation arms having their first ends journaled to the respective crank portions of each of said pair of bellcranks, and their second ends secured to a common journal, and
- a relief valve is included in said hydraulic circuit whereby mechanical overloads in the down position of the sheave bails will cause the relief valve to relax the hydraulic circuit to permit the sheave bails to move toward the up position.
- the bail rotation sheave release means of claim 3 including a guide means for said common journal of said actuation arms to guide and effect vertical up and down movement thereof.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
Description
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US194877A US3887081A (en) | 1971-11-02 | 1971-11-02 | Ball rotation sheave release |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US194877A US3887081A (en) | 1971-11-02 | 1971-11-02 | Ball rotation sheave release |
Publications (1)
Publication Number | Publication Date |
---|---|
US3887081A true US3887081A (en) | 1975-06-03 |
Family
ID=22719217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US194877A Expired - Lifetime US3887081A (en) | 1971-11-02 | 1971-11-02 | Ball rotation sheave release |
Country Status (1)
Country | Link |
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US (1) | US3887081A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4531647A (en) * | 1976-01-14 | 1985-07-30 | Hitachi, Ltd. | Device for stopping the swinging movement of a load hung by a crane |
US20090001040A1 (en) * | 2007-06-27 | 2009-01-01 | Kalmar Industries B.V. | Head block and container crane comprising such head block |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1650118A (en) * | 1924-09-30 | 1927-11-22 | Benjamin F Fitch | Load-lifting device |
US3561809A (en) * | 1967-12-29 | 1971-02-09 | Boeing Co | High torque cargo hook |
US3598440A (en) * | 1969-03-18 | 1971-08-10 | Fruehauf Corp | Rotatable container-hoisting apparatus |
-
1971
- 1971-11-02 US US194877A patent/US3887081A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1650118A (en) * | 1924-09-30 | 1927-11-22 | Benjamin F Fitch | Load-lifting device |
US3561809A (en) * | 1967-12-29 | 1971-02-09 | Boeing Co | High torque cargo hook |
US3598440A (en) * | 1969-03-18 | 1971-08-10 | Fruehauf Corp | Rotatable container-hoisting apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4531647A (en) * | 1976-01-14 | 1985-07-30 | Hitachi, Ltd. | Device for stopping the swinging movement of a load hung by a crane |
US20090001040A1 (en) * | 2007-06-27 | 2009-01-01 | Kalmar Industries B.V. | Head block and container crane comprising such head block |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FRUEHAUF CORPORATION, A CORP. OF DE Free format text: MERGER;ASSIGNORS:LMC ACQUISITION CORPORATION (MERGED INTO);X FRUEHAUF HOLDINGS, INC. (CHANGED TO);REEL/FRAME:005004/0687 Effective date: 19861223 Owner name: MES/MBK, LTD., A CORP. OF DE, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FRUEHAUF CORPORATION;REEL/FRAME:005004/0692 Effective date: 19881004 Owner name: FRUEHAUF CORPORATION, A CORP. OF MI Free format text: MERGER;ASSIGNOR:LMC ACQUISITION CORPORATION;REEL/FRAME:005004/0680 Effective date: 19881215 |
|
AS | Assignment |
Owner name: PACECO CORP. Free format text: CHANGE OF NAME;ASSIGNOR:MES/MBK, LTD.;REEL/FRAME:005043/0827 Effective date: 19890405 |