The invention concerns a container lift intended to be able to lift two containers arranged longitudinally. The invention comprises a primary frame, external transverse beams arranged on the primary frame with external locking means for locking the short sides of the containers that face away from each other, saddles arranged on the primary frame such that they can be displaced, inner locking means arranged on the lower surface of the saddles for locking of the short sides of the containers that face towards each other.
It can today be said that the use of containers dominates the transport of goods in large quantities. Thus the collection of containers for filling or for emptying requires ever-greater areas, and the containers are for this reason stacked on top of each other, and with gaps between them that are as small as possible. A small displacement or twisting of one container relative to another creates problems for a crane operator in correctly placing a container lift for lifting the container intended. This is a particularly serious problem for container lifts of the type known as “twin lift”. A twist or a displacement of two containers relative to each other may make it impossible to correctly place the lift and lock the containers. Small tolerances apply, a few tens of millimetres, when using locking of the type known as “twist lock”.
One aspect of the present invention is thus to provide a container lift of the twin lift type with which it is possible to handle two containers that are not aligned with each other.
The present invention is for this reason characterised by at least one of the saddles that are intended to lock the short sides of the containers that face each other being arranged such that it can be displaced in a direction that is principally sideways relative to the primary frame.
According to one embodiment of the invention, the saddle that belongs to one of the containers can be displaced in a sideways direction independently of the saddle that belongs to the second container.
According to one embodiment of the invention, the displacement is arranged to be carried out by a hydraulic system of piston-cylinder arrangements.
According to one particularly advantageous embodiment of the invention, the saddle that belongs to each of the containers is arranged such that it can be displaced with two piston-cylinder arrangements, the pistons of which are connected to each other and one cylinder is fixed attached to the primary frame and the second cylinder is fixed attached to the saddle; or whose cylinders are connected with each other and one piston is fixed attached to the primary frame and the second piston is fixed attached to the saddle.
The invention will now be described in more detail in the form of examples with reference to the drawings, where
a shows a side elevation of a container lift according to the invention;
b shows a plan of a container lift according to the invention;
c shows a view from one short side of a container lift according to the invention;
a shows schematically one possible position of two containers that can be lifted with a container lift according to the invention;
b shows schematically a second possible position of two containers that can be lifted with a container lift according to the invention;
c shows schematically a further possible position of two containers that can be lifted with a container lift according to the invention;
a-c show a container lift of twin lift type intended to be able to carry two containers and comprising a primary frame 4 on which saddles 5, 6, also known as “twin lift boxes”, having the form of rings are arranged. These are shown in
The primary frame is constituted by a design that makes it possible to adapt the distance between the locking means such that containers of different lengths can be locked in place and lifted. Furthermore, the distance between two containers that have been lifted can be altered during the lift. These designs are not described in any further detail here.
As is shown in
Each saddle (5, 6) that belongs to a container can in an embodiment that is not shown in the drawings be arranged such that it can be displaced with two piston-cylinder arrangements (10, 11), the pistons of which are instead connected with each other, with one cylinder fixed attached to the primary frame and the other cylinder fixed attached to the saddle, achieving the same effect.
Through the presence of equivalent hydraulic system in the two saddles that are facing each other, several positions can be achieved that are suitable for several different types of “erroneous” positions of two containers arranged in a longitudinal direction. Through displacing both saddles in the same direction, the container lift can land on and lock containers that are not placed with their central lines parallel, i.e. containers that are rotated relative to each other. If only one of the saddles is displaced, or if the saddles are each displaced in different directions, the container lift can land on and lock containers whose central lines are parallel to each other at a distance that is equivalent to the mutual displacement of the saddles. The displacement thus controls the magnitude that this distance may reach. Since only the saddles are displaced and not the cross beams that are arranged at the opposite ends, an “angular error” relative to the actual locations of the containers arises when the saddles are displaced. The locking means, i.e. the twist lock, however, possesses a margin of play that compensates the “angular errors” to which the relatively moderate displacements give rise.
The problem of containers that are located at an angle relative to each other, illustrated in
In order to avoid the saddles becoming wedged with the pegs 19 through what is known as the “chest of drawers” effect, a further piston-cylinder arrangement (not shown in the drawing) can be arranged under each of the saddles in order to be able to raise or lower the saddles.
The extent of protection is not to be regarded as limited to the examples described in the description: it includes a number of embodiments that are conceivable within the framework of the claims for one skilled in the arts.
Number | Date | Country | Kind |
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0401744-8 | Jul 2004 | SE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/SE05/01091 | 7/4/2005 | WO | 00 | 1/28/2008 |