Lift Devices for Containers
Disclosed is a lift device for lifting a container. The device includes a mount insert constructed to insert into and lock with a corner mounting block on the container. A carriage/trolley is attached to the mount insert, and includes a frame that defines a passthrough, a plurality of guide wheels attached to the frame that extend into the passthrough, and a lower pulley attached to the frame. A carriage/trolley vertical member is disposed in the passthrough, and includes a bottom end that contacts the ground, as well as a first upper pulley and a second upper pulley positioned away from the bottom end. A winch with a cable lifts the carriage/trolley. The cable exits the winch, spools on the first upper pulley, spools on the lower pulley, spools on the second upper pulley and connects to a cable anchor. The guide wheels ride along the carriage/trolley vertical member during lifting.
1 . A lift device for lifting a cargo container having a corner casting, the device comprising:
a mount insert configured to insert into and lock with a slot of the corner casting via rotation and at least one set screw;
a carriage fixed to the mount insert, the carriage comprising:
a frame defining a passthrough; a plurality of guide wheels attached to the frame and extending into the passthrough, each guide wheel having a groove; and
a lower pulley attached to the frame;
a vertical member slidably disposed in the passthrough, the vertical member having a polygonal cross-section with a plurality of vertices, each vertex received in a respective groove of the guide wheels, the vertical member further comprising:
a bottom end configured to contact the ground and including a flange;
a first upper pulley set positioned away from the bottom end; and
a second upper pulley set positioned away from the bottom end;
a winch mounted to a winch mounting plate fixed relative to the carriage, the winch comprising a cable routed from the winch to spool on the first upper pulley set, the lower pulley, the second upper pulley set, and terminate at a cable anchor fixed relative to the carriage; and
a battery mounted to a battery mounting plate fixed relative to the carriage and electrically coupled to the winch; wherein actuation of the winch shortens the cable to raise the carriage and the cargo container along the vertical member as the guide wheels roll along the vertices.
2 . The lift device of claim 1 , further comprising a vertical stabilization guide attached to the cargo container and slidably coupled to the vertical member via a bracket.
3 . The lift device of claim 1 , wherein the vertical member comprises a plurality of retention structures configured to receive a safety pin to prevent unintended lowering of the carriage.
4 . The lift device of claim 1 , wherein the winch is operable via a remote control.
5 . The lift device of claim 1 , further comprising an emergency brake assembly mounted to the carriage, the emergency brake assembly comprising:
a retention pin biased by a spring toward the vertical member to engage a retention structure thereof; and
a brake pulley connected to the retention pin and contacted by the cable;
wherein tension in the cable overcomes the spring bias to disengage the retention pin, and loss of tension allows the spring to engage the retention pin with the retention structure.
6 . The lift device of claim 1 , wherein at least one of the first upper pulley set, the second upper pulley set, or the lower pulley comprises a plurality of pulleys.
7 . The lift device of claim 1 , wherein the polygonal cross-section of the vertical member is rectangular.
8 . The lift device of claim 1 , wherein the winch mounting plate and the battery mounting plate are integral with the frame.
9 . A lift device for lifting a cargo container, comprising:
a mount insert lockable to a corner casting of the cargo container;
a carriage secured to the mount insert and comprising a frame defining a passthrough with guide wheels extending therein;
a vertical member slidably received in the passthrough, the vertical member having vertices engaged by the guide wheels, a ground-contacting bottom end, and upper pulleys positioned away from the bottom end;
a winch comprising a cable routed through the upper pulleys and a lower pulley on the carriage to a fixed anchor; and
an emergency brake assembly on the carriage configured to lock the carriage to the vertical member upon slack in the cable.
10 . The lift device of claim 9 , further comprising a stabilization guide parallel to the vertical member and slidably linking the cargo container to the carriage.
11 . The lift device of claim 9 , wherein the winch is battery-powered and remotely operable.
12 . The lift device of claim 9 , wherein the vertical member comprises safety pin holes positioned above the carriage during lifting.
13 . A method of lifting a cargo container using the lift device of claim 1 , comprising:
locking the mount insert into the corner casting;
positioning the vertical member vertically with its bottom end contacting the ground;
routing the cable from the winch through the first upper pulley set, the lower pulley, and the second upper pulley set to the anchor; and
actuating the winch to raise the carriage and the cargo container while the guide wheels track the vertices of the vertical member.
14 . The method of claim 13 , further comprising inserting a safety pin into a retention structure above the carriage after partial lifting.
15 . The method of claim 13 , further comprising maneuvering a flatbed truck beneath the raised cargo container and lowering the cargo container onto the truck.