Back to results
US 7,740,440 B2Granted
Continuous breakdown hoists
AssigneeMill Tech Industries
InventorsJames Bruce Hannebauer, Ronald James Hougen
Life of this patent
Estimating the term…
Abstract
A breakdown hoist has a secondary stage that permits continuous operation. The breakdown hoist may be run with the secondary stage disabled. In some embodiments a primary and secondary stage can discharge lumber simultaneously onto two conveyors. Providing two conveyors can increase surge capacity.
Claims12
A breakdown hoist for breaking down packages comprising multiple tiers of lumber, the breakdown hoist comprising:
- a main frame having a top edge and a face,
- a main lift arranged to lift packages along the face of the main frame,
- an extension frame having a face, the extension frame moveable between an extended position wherein the face of the extension frame extends past the top edge of the main frame and a retracted position wherein lumber can spill over the top edge of the main frame,
- a secondary hoist having a lifting support that is extendable to receive and support a package lifted by the main hoist and retractable, the secondary hoist adapted to lift a package to a secondary top edge above the top edge of the main frame, and
- a conveyor having an end that is movable up and down between a first position wherein the end of the conveyor is located to receive lumber that has spilled over the top edge of the main frame and a second position wherein the end of the conveyor is located to receive lumber that has spilled over the secondary top edge.
2 more elements
A breakdown hoist for breaking down packages comprising multiple tiers of lumber, the breakdown hoist comprising:
- a main frame having a top edge and a face,
- a main lift arranged to lift packages along the face of the main frame,
- an extension frame having a face, the extension frame moveable between an extended position wherein the face of the extension frame extends past the top edge of the main frame and a retracted position wherein lumber can spill over the top edge of the main frame,
- a secondary hoist having a lifting support that is extendable to receive and support a package lifted by the main hoist and retractable, the secondary hoist adapted to lift a package to a secondary top edge above the top edge of the main frame, and
- a lower conveyor having an end located to receive lumber that has spilled over the top edge of the main frame and an upper conveyor having an end located to receive lumber that has spilled over the secondary top edge,
- wherein the main frame is movable between a tilted position wherein the face of the main frame is inclined and a loading position wherein the face of the main frame is substantially upright.
3 more elements
Dependencies are inferred from the claim text.