Elevator and elevator refurbishing method

Patent metadata

Field	Value
Publication number	US-9475675-B2
Application number	US-201214396940-A
Country	US
Kind code	B2
Filing date	Jun 18, 2012
Priority date	Jun 18, 2012
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A car and a counterweight are suspended by a main rope that is wound onto a driving sheave, a car suspending sheave, and a counterweight suspending sheave. A first main rope portion between the driving sheave and the car suspending sheave and a second main rope portion between the car suspending sheave and the car-side rope fastener portion are passed through a common car-side penetrating aperture so as to cross each other when viewed in an axial direction of the driving sheave. A third main rope portion between the driving sheave and the counterweight suspending sheave and a fourth main rope portion the counterweight suspending sheave and the counterweight-side rope fastener portion are passed through a common counterweight-side penetrating aperture that is disposed on the machine room floor so as to cross each other when viewed in the axial direction of the driving sheave.

First claim

The invention claimed is:

1. An elevator comprising:
a car that can be vertically raised and lowered inside a hoistway;
a car suspending sheave that is disposed on an upper portion of the car between a top surface of the car and a top surface of the hoistway:
a counterweight that can be raised and lowered inside the hoistway;
a counterweight suspending sheave that is disposed on an upper portion of the counterweight between a top surface of the counterweight and a top surface of the hoistway:
a driving apparatus that includes a driving sheave, that is disposed inside a machine room that is positioned above the hoistway, and that generates a driving force that raises and lowers the car and the counterweight; and
a main rope that is connected to each of a car-side rope fastener portion and a counterweight-side rope fastener portion that are disposed inside the machine room, and that suspends the car and the counterweight by being wound onto the driving sheave, the car suspending sheave, and the counterweight suspending sheave,
wherein:
a portion of the main rope that is directed from the driving sheave to the car-side rope fastener portion is wound onto the car suspending sheave at a first side of the car suspending sheave, a distance from the side of the car suspending sheave to a vertical line that passes through a shaft axis of the driving sheave is horizontally greater than a distance from a vertical line that passes through a shaft axis of the car suspending sheave to the vertical line passing through axis of the driving sheave;
a portion of the main rope that is directed from the driving sheave to the counterweight-side rope fastener portion is wound onto the counterweight suspending sheave at a first side of the counterweight suspending sheave, a distance from the side of the counterweight suspending sheave to the vertical line passing through the shaft axis of the driving sheave is horizontally greater than a distance from a vertical line that passes through a shaft axis of the counterweight suspending sheave to the vertical line passing through axis of the driving sheave, wherein the horizontal distance is substantially perpendicular to a vertical motion of the car;
the main rope includes: a first main rope portion that is positioned between the driving sheave and the car suspending sheave; a second main rope portion that is positioned between the car suspending sheave and the car-side rope fastener portion; a third main rope portion that is positioned between the driving sheave and the counterweight suspending sheave; and a fourth main rope portion that is positioned between the counterweight suspending sheave and the counterweight-side rope fastener portion;
the first main rope portion and the second main rope portion are passed through a common car-side penetrating aperture that is disposed on a machine room floor that forms a partition between the hoistway and the machine room, the first main rope extending from the driving sheave to the first side of the car suspending sheave and extending across the vertical line passing through the car suspending sheave axis, the second main rope extending from a second side of the car suspending sheave opposite the first side, to the car-side rope fastener portion and extending across the vertical line passing through the car suspending sheave axis, wherein a point of contact between the first main rope and the driving sheave is positioned on a first side of the vertical line extending through the car suspending sheave axis, and an end of the second rope attached to the car-side rope fastener portion is positioned on a second side of the vertical line extending through the car suspending sheave axis which is opposite the first side so that the first main rope and the second main rope cross each other when viewed in a direction perpendicular to the vertical motion of the car; and
the third main rope portion and the fourth main rope portion are passed through a common counterweight-side penetrating aperture that is disposed on the machine room floor, the third main rope extending from the driving sheave to the first side of the counterweight suspending sheave and extending across the vertical line passing through the counterweight suspending sheave axis, the fourth main rope extending from a second side of the counterweight suspending sheave opposite the first side, to the counterweight-side rope fastener portion and extending across the vertical line passing through the counterweight suspending sheave axis, wherein a point of contact between the third main rope and the driving sheave is positioned on a first side of the vertical line extending through the counterweight suspending sheave axis, and an end of the fourth rope attached to the counterweight-side rope fastener portion is positioned on a second side of the vertical extending through the counterweight suspending sheave axis which is opposite the first side so that the third main rope and the fourth main rope cross each other when viewed in a direction perpendicular to the vertical motion of the car.

2. The elevator according to claim 1 , wherein:
the first main rope portion is disposed within a range of a thickness of the driving sheave, and the second main rope portion is disposed outside the range of the thickness of the driving sheave, when the car-side penetrating aperture is viewed in a vertical direction which is a same direction as the vertical motion of the car; and
the third main rope portion is disposed within the range of the thickness of the driving sheave, and the fourth main rope portion is disposed outside the range of the thickness of the driving sheave, when the counterweight-side penetrating aperture is viewed in the vertical direction which is a same direction as the vertical motion of the car.

3. The elevator according to claim 2 , wherein:
the driving sheave is disposed within a range between the car suspending sheave vertical line that passes through the shaft axis of the car suspending sheave and the counterweight suspending sheave vertical line that passes through the shaft axis of the counterweight suspending sheave when viewed in the axial direction of the driving sheave, the axial direction of the driving sheave being perpendicular to the vertical motion of the car; and
the car-side rope fastener portion and the counterweight-side rope fastener portion are disposed outside the range between the car suspending sheave vertical line and the counterweight suspending sheave vertical line when viewed in the axial direction of the driving sheave.

4. The elevator according to claim 1 , wherein:
the driving sheave is disposed within a range between the car suspending sheave vertical line that passes through the shaft axis of the car suspending sheave and the counterweight suspending sheave vertical line that passes through the shaft axis of the counterweight suspending sheave, when viewed in the axial direction of the driving sheave, the axial direction of the driving sheave being perpendicular to the vertical motion of the car; and
the car-side rope fastener portion and the counterweight-side rope fastener portion are disposed outside the range between the car suspending sheave vertical line and the counterweight suspending sheave vertical line when viewed in the axial direction of the driving sheave.

5. An elevator refurbishing method, being an elevator refurbishing method to modify a method for suspending a car and a counterweight by a main rope from one-to-one (1:1) to two-to-one (2:1), comprising:
a car suspending sheave mounting step in which a car suspending sheave is mounted onto an upper portion of the car between a top surface of the car and a top surface of a hoistway;
a counterweight suspending sheave mounting step in which a counterweight suspending sheave is mounted onto an

Assignees

• Kawakami Shigenobu
• Nishida Takao
• Mitsubishi Electric Corp

Inventors

• Kawakami Shigenobu
• Nishida Takao

Classifications

• Y10T29/49718

  Repairing · CPC title

• B66B9/00

  Kinds or types of lifts in, or associated with, buildings or other structures (characterised by control systems B66B1/00; apparatus for raising or lowering persons on stages of theatres A63J5/12) · CPC title

• B66B19/007

  method for modernisation of elevators · CPC title

• B66B11/008 Primary

  with hoisting rope or cable operated by frictional engagement with a winding drum or sheave · CPC title