US 2008/0277207 A1Published application

Machine Room-Less Elevator

AssigneeToshiba Elevator Kabushiki Kaisha

InventorsKan Kawasaki, Ikuo Asami, Takashi Ishii, Shun Fujimura, Satoshi Takasawa

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Abstract

A machineroom-less elevator in which a counterweight is vertically moved behind a cage, with the cage and the counterweight being suspended in a jig back manner through a first and second diverting sheaves. In this machineroom-less elevator, a sufficiently large vertical stroke of the counterweight can be secured, while a durability of a hoist rope is improved. In addition, since no tensile difference is generated in respective parts of the hoist rope, vertical vibrations of the cage are prevented when the cage restarts a vertical movement. A traction sheave is disposed on one of right and left sidewalls of an elevator shaft. A first diverting sheave is disposed below and sufficiently apart from the traction sheave, and a second diverting sheave is disposed on a top of a rear wall of the elevator shaft. The traction sheave is disposed to be inclined relative to the sidewall such that a rotational axis thereof extends from the sidewall of the elevator shaft to the rear wall thereof, when viewed vertically from above.

Claims11

Dependent claims

A machineroom-less elevator comprising:

a cage guided by a pair of right and left cage-side guide rails to be vertically moved in an elevator shaft;
a counterweight which has a counterweight-side sheave, and is guided by a pair of right and left counterweight-side guide rails to be vertically moved behind the cage along a rear wall of the elevator shaft;
a traction sheave which is disposed on a top of the elevator shaft near one of right and left sidewalls of the elevator shaft, and is driven in rotation about a rotational axis extending from the sidewall to the rear wall when viewed vertically from above;
a driving apparatus which drives the traction sheave in rotation;
a pair of right and left cage-side sheaves which suspend and support the cage on an upper part thereof, and are capable of being rotated about rotational axes parallel to a rotational axis of the traction sheave, or about rotational axes extending at an angle adjacent to the rotational axis of the traction sheave;
a first diverting sheave which is disposed lower than the traction sheave near the sidewall, and is rotated about a rotational axis extending in the right and left direction;
a second diverting sheave which is disposed higher than the first diverting sheave near the rear wail, and is rotated about a rotational axis extending in the back and forth direction;
and
a hoist rope passed round the traction sheave, with one end of the hoist rope suspending the cage through the pair of right and left cage-side sheaves, and the other end thereof suspending the counterweight through the first and second diverting sheaves and the counterweight-side sheaves.

6 more elements

Dependencies are inferred from the claim text.