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US 4,766,977 AGranted
Load detecting apparatus for elevator
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorShinji Yamasaki
Life of this patent
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Abstract
A load detecting apparatus for an elevator for detecting a torsion generated on a rotary shaft of a traction sheave for driving an elevator cage and a counterweight in accordance with a difference between the load of the cage and the counterweight, so that the apparatus is capable of detecting with precision an unbalanced load, even when the passengers are standing on one side of the cage platform.
Claims8
A load detecting apparatus for an elevator comprising:
- a traction sheave having a hoisting rope wound thereon, one end of the rope being fixed to an elevator cage and the other being attached to a counterweight so that the elevator cage and counterweight are at least partly balanced;
- a rotary shaft disposed between said traction sheave and a controller which controls said traction sheave for transmitting a controlled force to said traction sheave;
- and
- torsion detecting means responsive to the torsion applied to said rotary shaft while the cage is at rest for detecting the degree and direction of any inbalance between the cage and counterweight acting on said hoisting rope.
1 more element
Dependencies are inferred from the claim text.