Lift assembly systems and methods
AssigneeElectronic Theatre Controls, Inc.
InventorsDonald A. Hoffend, III, William R. Florac, Michael Lichter, Edwin W. Bolz
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Abstract
A lift assembly includes an article to be lifted between a lowered position and a raised position, a drive element coupled to the article, a power mechanism coupled to the drive element, and a power transfer mechanism coupled between the power mechanism and the drive element. The power transfer mechanism includes control electronics having a first upward limit switch adapted to deactivate the power mechanism when the article is lifted to a first upward height, and a second upward limit switch adapted to deactivate the power mechanism when the article is lifted to a second upward height higher than the first upward height.
Claims20
A lift assembly comprising:
- an article to be lifted between a lowered position and a raised position;
- a drive element coupled to the article;
- a power mechanism coupled to the drive element;
- and
- a power transfer mechanism coupled between the power mechanism and the drive element, the power transfer mechanism including control electronics comprising:
- a first upward limit switch adapted to deactivate the power mechanism when the article is lifted to a first upward height;
- and
- a first downward limit switch adapted to deactivate the power mechanism when the article is lowered to a first downward height.
A lift assembly comprising:
- an article to be lifted between a lowered position and a raised position;
- a drive element coupled to the article;
- a power mechanism coupled to the drive element;
- and
- a power transfer mechanism coupled between the power mechanism and the drive element, the power transfer mechanism including control electronics comprising:
- a first upward limit switch adapted to deactivate the power mechanism when the article is lifted to a first upward height;
- and
- a second upward limit switch adapted to deactivate the power mechanism when the article is lifted to a second upward height higher than the first upward height.
A lift assembly comprising:
- an article to be lifted between a lowered position and a raised position;
- a drive element coupled to the article;
- a power mechanism coupled to the drive element;
- and
- a power transfer mechanism coupled between the power mechanism and the drive element, the power transfer mechanism including control electronics comprising:
- a first downward limit switch adapted to deactivate the power mechanism when the article is lowered to a first downward height;
- and
- a second downward limit switch adapted to deactivate the power mechanism when the article is lowered to a second downward height lower than the first downward height.
Dependencies are inferred from the claim text.