GB2041325A - Container Lifting Spreader - Google Patents
Container Lifting Spreader Download PDFInfo
- Publication number
- GB2041325A GB2041325A GB7903764A GB7903764A GB2041325A GB 2041325 A GB2041325 A GB 2041325A GB 7903764 A GB7903764 A GB 7903764A GB 7903764 A GB7903764 A GB 7903764A GB 2041325 A GB2041325 A GB 2041325A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lifting
- twist
- lock
- sealand
- container
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/62—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled
- B66C1/66—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof
- B66C1/663—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof for containers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
A container lifting device suitable for use in lifting both I.S.O. and Sealand type containers has a twist- lock 7 mounted at the end of a lifting beam such that it has a freedom of movement in the longitudinal direction of the lifting beam equal to at least half the difference in lateral spacing between the lifting pockets 23, 22 of I.S.O. and Sealand type containers so that together with a similarly mounted twist-lock at the other end of the beam the said difference in lateral spacing between the lifting pockets can be accommodated by the lifting beam. The twist lock head comprises two end parts 26 which will pass through the slots of a Sealand type top opening and a central part 27 which is of the maximum permissible width for an I.S.O. type top opening, the length of the central part being substantially equal to the diameter of the circular part of a Sealand type top opening. <IMAGE>
Description
SPECIFICATION
Improvements Relating to Container Lifting
Devices Incorporating Twist-locks
This invention relates to container lifting
devices incorporating twist locks for engaging in
lifting pockets provided by corner castings on a
container.
The vast majority of containers in use today are
either of the I.S.O. type or the Sealand type. The
lifting pockets of the I.S.O. containers have an
elongated generally rectangular top opening
through which a twist-lock is inserted, whereas
the Sea land containers have a top opening which
is of double keyhole shape in that it comprises
two elongated slots which extend from opposite
directions into a central circuit part. The width of
the slots of the top openings of the Sealand
containers is less than the width of the top
opening of the I.S.O. containers.
In the past each type of container has used its
own appropriately profiled twist-lock, but due to
heavy demand for handling cargos of mixed
containers a lifting device suitable for use with
both types of container is now very desirable.
However the different shapes and the different
dimensions of the top openings of the I.S.O. and
Sealand Containers do present difficulties which
are further complicated by the fact that the lifting
pockets of the Sealand containers are 25 mm further apart laterally of the container than the
lifting pockets of the I.S.O. containers.
The object of the present invention is to
provide a lifting device which is suitable for use in
lifting both I.S.O. and Sealand containers.
According to the present invention, a lifting device suitable for lifting I.S.O. and Sealand type containers comprises a twist-lock which is
mounted at the end of a lifting beam adapted in use to extend laterally of a container, the twist lock having a freedom of movement in the longitudinal direction of the lifting beam equal to at least half the difference in lateral spacing between the lifting pockets of I.S.O. and Sealand type containers.
Advantageously the head of the twist-lock has end parts which will pass through the slots of a
Sealand top opening and a central part which is of substantially the maximum width to pass through the top opening of the lifting pocket of an I.S.O.
container, the length of the central part being such that it passes through the circular part of the
Sealand top opening and preferably of the maximum length possible such that a portion of its central part engages the lifting pocket of an
I.S.O. container when in the lifting position.
One lifting device in accordance with the invention will now be described by way of example with reference to the accompanying drawings, in which;
Figure 1 is a side view of the lifting device as fitted to one end of a lifting beam.
Figure 2 is an end view of the lifting device,
Figure 3 is a plan view of the lifting device, and
Figures 4 and 5 are explanatory diagrams
showing how the lifting device adjusts itself to
centre on the top openings of the lifting pockets
of I.S.O. and Sealand containers.
The lifting device is disposed at one end of a
lifting beam 1, a similar lifting device being
disposed at the other end of the beam 1. For
lifting purposes the beam 1 extends laterally of
the container at one end thereof and a similar
lifting beam extends laterally of the container at
its other end. It is conventional practice to
interconnect the two beams by structure which
enables the spacing between the two beams to
be adjusted to accommodate different lengths of
container. The whole assembly is mounted for
lifting and lowering on a crane.
The lifting beam 1 is shown provided with a
limit switch 3 which is actuated by a feeler rod 4
engaging the top of a lifting pocket. Since these devices form no part of the present invention they will not be further described.
The end of the beam 1 is provided with a
housing 5 for the twist-lock assembly. The twist
lock itself, referenced 6 in the drawings, extends
downwardly so that its head 7 and a portion of its shank 8 project below the beam 1. At its upper end the shank 8 is connected to conventional
hydraulic drive mechanism 9 through doublearmed lever 10 and connecting rods 1 Thus the twist-lock 6 can be positively rotated through 902 from a position in which the head 7 aligns with the top opening in the container to a position in which the head 7 becomes trapped in the lifting pocket, and can be positively rotated back to its
initial position to allow the head 7 to be released from the lifting pocket.
The whole of the twist-lock assembly comprising the twist-lock 6, drive mechanism 9 and associated parts is mounted on a plate 13 which rests on the bottom of the housing 5. The upper part of the twist-lock shank 8 passes through a cylindrical boss 14 welded to the upper face of the plate 13 and the lower part of the twist-lock shank passes through a boss 1 5 welded to the lower face of the plate 1 3.The part of the shank 8 extending above the upper boss 14 is threaded and a nut 1 6 is screwed on to it which prevents downward movement of the twist-lock 6 relatively to the plate 1 3. Upward movement of the twist-lock 6 relatively to the plate 13 is prevented by the head 7 abutting the lower boss 1 5. The plate 13 is held down against the bottom of the housing 5 by a restraining structure 1 7 of boxed-up plate form which is bolted to the housing 5. The structure 1 7 has bearing strips 1 8 which bear against the upper face of the plate 13.
Thus the plate 13 is constrained against upward and downward movement relative to the housing 5. However, as will become apparent, the plate 13 has freedom to slide horizontally.
As can best be seen from Figure 2, the cylindrical boss 14 locates between the bearing strips 1 7 and as best seen in Figure 3, the bearing strips 1 7 define an elliptical recess whose periphery is shown at 1 9, the major axis of the ellipse extending longitudinally of the beam 1.
Thus the horizontal movement of the plate 13 is limited by the boss 14 abutting the periphery 1 9 of the elliptical recess. The size of the elliptical recess is such that misalignment of the twist lock 6 and the lifting pocket as the lifting assembly is lowered on to the container can be accommodated. The profile of the twist-lock head 7 automatically acts as a cam against the edge of the top opening of the lifting pocket to move the plate 13 and thus the twist-lock assembly to centre the twist-lock 6 in the lifting pocket. The extra displacement provided laterally of the container, i.e. along the major axis of the ellipse, accommodates the different lateral spacing between the lifting pockets of the I.S.O. and
Sea land containers.It is adequate to allow an extral displacement which equal to half the difference in lateral spacing between the lifting pockets of l.S.O. and Sealand containers, the remaining displacement required being provided by the lifting device at the other end of the beam
1.
Referring now particularly to Figures 4 and 5, these show diagrammatically the periphery 1 9 of the elliptical recess whose central axis is indicated at 20 when the twist-lock head 7 is centred on the top opening of a Sealand container, the periphery of this opening being shown at 22 in
Figures 4 and 5. The central axis of the elliptical recess is shown at 201 when the twist-lock head 7 is centred on the top opening of an I.S.O.
container, the periphery of this opening being shown at 23 in Figures 4 and 5. Hence the spacing between the indicated axes 20 and 201 is the horizontal distance which the plate 1 3 has to move to accommodate half the difference in lateral spacing between the lifting pockets of l.S.O. and Sealand containers.
As previously stated the slots 24 leading to the central circular area of the Sealand top opening are narrower than the I.S.O. top-opening.
Consequently if the shape of the twist lock-head as previously used for I.S.O. containers is simply narrowed down to pass through the Sealand slots 24, this could lead to a significant reduction in the fatigue life of the twist lock head since the strength of the head would be considerably reduced. As a compromise therefore the head 7 is only narrowed down at its end parts 26 which pass through the Sealand slots 24 and takes advantage of the central circular area 25 of the
Sealand top opening to maintain its original width over its central part 27. The transition from the end parts 26 of the head 7 to the central part 27 is through inclined shoulders 29 which follow the curve of the circular part 25. Thus when lifting
I.S.O. containers a portion of the wider part 27 of the head 7 engages the top of the lifting pockets as well as the whole of the end parts 26.
It is to be noted that when used for lifting both
I.S.O. and Sealand containers that the vertical axis of rotation of the twist lock, i.e. the axis of shank 8 is central of the top opening of the lifting pockets.
Claims (5)
1. A lifting device suitable for lifting I.S.O. and
Sealand type containers, said lifting device comprising a twist-lock which is mounted at the end of a lifting beam adapted in use to extend laterally of a container, the twist lock having a freedom of movement in the longitudinal direction of the lifting beam equal to at least half the difference in lateral spacing between the lifting pockets of I.S.O. and Sealand type containers.
2. A lifting device according to claim 1, wherein the head of the twist-lock has end parts which will pass through the slots of the top opening of a lifting pocket of a Sealand type container and a central part which is of substantially the maximum width to pass through the top opening of the lifting pocket of an I.S.O.
container, the length of the central part being such that it passes through the circular part of the top opening of the lifting pockets of a Sea land type container.
3. A lifting device according to claim 2, wherein the central part is of the twist-lock head has a length substantially equal to the diameter of said circular part.
4. A lifting device according to claim 3, wherein the transition from said end parts of the twist-lock head to said central part is through inclined shoulders.
5. A lifting device substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7903764A GB2041325B (en) | 1979-02-02 | 1979-02-02 | Container lifting spreader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7903764A GB2041325B (en) | 1979-02-02 | 1979-02-02 | Container lifting spreader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2041325A true GB2041325A (en) | 1980-09-10 |
| GB2041325B GB2041325B (en) | 1983-02-16 |
Family
ID=10502928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7903764A Expired GB2041325B (en) | 1979-02-02 | 1979-02-02 | Container lifting spreader |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2041325B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3201329A1 (en) * | 1981-01-21 | 1982-09-23 | Valmet Oy, 00130 Helsinki | LIFTING DEVICE FOR HANDLING CONTAINERS AND GRIP SPINDLE FOR CONTAINERS |
| AU725211B2 (en) * | 1996-11-15 | 2000-10-05 | Ausco Modular Pty Limited | A safety lifting connection system |
-
1979
- 1979-02-02 GB GB7903764A patent/GB2041325B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3201329A1 (en) * | 1981-01-21 | 1982-09-23 | Valmet Oy, 00130 Helsinki | LIFTING DEVICE FOR HANDLING CONTAINERS AND GRIP SPINDLE FOR CONTAINERS |
| AU725211B2 (en) * | 1996-11-15 | 2000-10-05 | Ausco Modular Pty Limited | A safety lifting connection system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2041325B (en) | 1983-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 19990201 |