Load detector for elevator cage
AssigneeKabushiki Kaisha Toshiba
InventorsSatoshi Suzuki, Kosei Kamimura, Kenji Mizutani
Life of this patent
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Abstract
A load detector for an elevator having a cage moving up and down in a shaft for transporting passengers and a cable hanging the cage, including a relative position detector configured to detect a relative position of the cage against the shaft; and a calculator configured to calculate a change of the relative position between the position of the cage just after landing at a floor and the position of the cage just before leaving the floor, and a load of the cage on the basis of the change of the relative position caused by an expansion and contraction of the cable.
Claims3
A load detector for an elevator having a cable placed around a sheave driven by a motor, said cable hanging a weight and a cage moving up and down in a shaft for transporting passengers, comprising:
- a brake having a housing, a brake disk secured to a rotary shaft of said motor, and a brake shoe for pressing said brake disk toward an elastic ring disposed between said brake shoe and the inside wall of said housing and stopping the revolution of said sheave;
- a strain detector attached to said elastic ring and configured to detect a torsional strain of said brake disk caused by an unbalance in weight between said cage and said weight;
- and
- a calculator configured to calculate a change of said torsional strain between a torsional strain just after said cage lands at a floor and a torsional strain just before said cage leaves said floor, and a load of said cage on the basis of said change of said torsional strain.
A load detector for an elevator having a cable placed around a sheave driven by a motor, said cable hanging a cage through a hanging sheave attached to said cage moving up and down in a shaft for transporting passengers, comprising:
- a strain detector configured to detect a strain of a rotary shaft of said sheave caused by a bending force (F2) applied perpendicular to and intersecting the axis of said rotary shaft;
- and
- a calculator configured to calculate a load of said cage on the basis of said strain.
A load detector for an elevator having a cable placed around a sheave driven by a motor said cable hanging a cage through a hanging sheave attached to said cage moving up and down in a shaft for transporting passengers, comprising:
- a strain detector configured to detect a strain of a shaft of said hanging sheave caused by a bending force (F2) applied perpendicular to and intersecting the axis of said rotary shaft;
- and
- a calculator configured to calculate a load of said cage on the basis of said strain.
Dependencies are inferred from the claim text.