Elevator apparatus with hoisting machine beneath elevator car

Details Elevator apparatus with hoisting machine beneath elevator car Elevator apparatus with hoisting machine beneath elevator car

1999-12-20

2001-10-16

Salata, Jonathan (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes linking support cable in drive-means

C187S406000

Reexamination Certificate

active

06302239

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an elevator apparatus in which a hoisting machine is installed within a hoistway.
BACKGROUND ART
FIG. 8
is a structural view showing a conventional elevator apparatus shown in Japanese Utility Model Application Laid-Open No. Sho 61-52679.
FIG. 9
is a plan view of FIG.
8
. In these drawings, a machine room
1
is located adjacent to a hoistway
2
. A hoisting machine
4
having a drum
3
is installed in the machine room
1
. A rotatable return pulley
5
is provided on a ceiling portion of the hoistway
2
.
A proximal end portion of a hoisting rope
6
is wound around the drum
3
. An intermediate portion of the hoisting rope
6
is wound around the return pulley
5
. A car
7
which ascends or descends within the hoistway
2
is suspended at a distal end portion of the hoisting rope
6
.
In such an elevator apparatus, the drum
3
of the hoisting machine
4
is rotated so that the hoisting rope
6
is paid out or wound up, thus raising or lowering the car
7
within the hoistway
2
.
However, since the machine room
1
is provided for installing the hoisting machine
4
, the area in a building occupied by the elevator apparatus increases, and the space utilization efficiency of the building is degraded. Also, since the return pulley
5
is disposed on the ceiling portion of the hoistway
2
, it is necessary to keep a space at a top portion of the hoistway
2
for the return pulley
5
in addition to the hoistway stroke of the car
7
. This also degrades the utilization efficiency of the building.
Japanese Utility Model Application Laid-Open No. 62-11894 also shows an elevator apparatus in which a machine room is provided in a lower-portion of a staircase adjacent to a hoistway and a hoisting machine is installed in this machine room. However, even in this apparatus, the utilization efficiency of the building is reduced because it is necessary to provide the machine room independent from the hoistway.
Furthermore, Japanese Patent Application Laid-Open No. Hei 9-165172 discloses an elevator apparatus in which a driver for a traction sheave is installed on a wall of a hoistway. However, in this elevator apparatus, it is necessary to make the driver relatively thin so that the traction sheave does not interfere with the car. As a result, there is a fear that sufficient driving force can not be obtained, and that the cost therefore would be increased as well. Also, in order to install the type of hoisting machine generally used, it is necessary to increase the area of the hoistway, which also degrades the utilization efficiency of the building.
DISCLOSURE OF THE INVENTION
In order to solve the above mentioned problems, an object of the present invention is to provide an elevator apparatus for reducing an installation space of the apparatus as a whole to enhance building utilization efficiency while dispensing with a machine room.
In order to attain these and other objects, according to the present invention, there is provided an elevator apparatus comprising: a hoistway having a hoistway wall and a bottom portion; a car which ascends and descends within the hoistway; a hoisting machine having a rotatable drum, the hoisting machine being disposed on the bottom portion of the hoistway so that the hoisting machine is shadowed by a car projection region obtained by a projection from the car in the hoistway direction, with a portion of the drum being out from under the car projection region; a rotatable return pulley disposed within the hoistway; and a hoisting rope having a first end portion connected to the car, a second end portion wound around the drum and an intermediate portion wound around the return pulley through a space between the car and the hoistway wall.
Also, according to another aspect of the present invention, there is provided an elevator apparatus comprising: a hoistway having a hoistway wall and a bottom portion; a car and a balance weight for alternately ascending and descending within the hoistway; a hoisting machine having a rotatable traction sheave, the hoisting machine being disposed on the bottom portion of the hoistway so that the hoisting machine is shadowed by a car projection region obtained by a projection from the car in the hoistway direction, with the traction sheave being out from under the car projection region; first and second rotatable return pulleys disposed within the hoistway; and a rope having a car suspension portion wound around the first return pulley for suspending the first car, a weight suspension portion wound around the second return pulley for suspending the balance weight, and an intermediate portion wound around the traction sheave between the car suspension portion and the weight suspension portion.


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