Traction elevator

Details Traction elevator Traction elevator

1999-02-11

2002-12-03

Olszewski, Robert P. (Department: 2167)

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

C187S254000, C187S266000, C187S414000

Reexamination Certificate

active

06488125

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a traction elevator having a compensating rope guide, and more particularly to a traction elevator that can reduce the swing of the compensating rope so as to stop the emission of unpleasant noise and vibration of an elevator car, and thus increase the comfort of the ride in the car.
2. Discription of the Related Art
FIG.
11
(
a
) is a side view of an ordinary type of widely used traction elevator. In the traction elevator, three ropes
3
(only one is shown) are attached at a first end thereof to a top of a the car
1
, and at a second end thereof to a top of a counterweight
2
. The ropes
3
are guided by a deflector sheave
6
a
and a sheave
6
driven by a motor in a machine room
5
located over an elevator shaft
4
. Friction between the ropes
3
and sheave
6
raises and lowers the car
1
in order to carry passengers and freight.
However, in a traction elevator operating in a very tall shaft, if there is an imbalance of weight between a portion of ropes
3
on the car
1
side of sheave
6
and a portion of the ropes
3
on the counterweight
2
side of sheave
6
, the ropes
3
might slip on the sheave
6
. Therefore, in the traction elevator operating in a tall shaft, as shown in FIG.
11
(
b
), a compensating rope
7
is usually attached at a first end thereof to the bottom of the car
1
, and at a second end thereof to the bottom of the counterweight
2
.
Then, this kind of the compensating rope
7
can be roughly classified into three types.
First, as shown in FIG.
12
(
b
), a wire rope
10
such as the rope
3
is used as the compensating rope
7
. Second, as shown in FIG.
12
(
c
), a chain
8
made of steel is in use as the compensating rope
7
. Third, as shown in FIG.
12
(
a
), a coated chain
13
composed of the chain
8
covered with coating
9
such as resin is also used as the compensating rope
7
.
In the following description, the wire rope
10
, the chain
8
and the coated chain
13
are referred to generically as the compensating rope
7
.
As shown in FIG.
12
(
b
), the wire rope
10
is generally used in a high-speed elevator, and a tension pulley
11
is usually attached at the curving portion of the wire rope
10
to tension the wire rope
10
. Accordingly, the tension pulley
11
lowers the vibration of the wire rope
10
and puts the wire rope
10
in orbit.
The chain
8
is usually used in a relatively low-speed elevator. As shown in FIG.
12
(
c
), this type of the chain
8
can omit the tension pulley
11
attached at the curving portion of the wire rope
10
in FIG.
12
(
b
), and thus reduce the cost of equipment, because the chain
8
does not swing as easily as the wire rope
10
when hanging with the tension of its own weight.
However, if the chain
8
is used in a high-speed elevator, the chain
8
makes noise and swings more than the wire rope
10
in a condition of hanging with the tension of the weight of the tension pulley
11
in FIG.
12
(
b
). Although the chain
8
does not swing as easily as the wire rope
10
when hanging with the tension of its own weight, the chain
8
is not available in the high-speed elevator.
In recent years, the coated chain
13
compromising the wire rope
10
and the chain
8
has been adopted.
As shown in FIG.
12
(
d
), the coated chain
13
includes the chain
8
covered with the coating
9
that reduces noise. Further, guides composed of small rollers
14
are arranged above the curving portion of the coated chain
13
in order to reduce the swing of the coated chain
13
. Therefore, the coated chain
13
can be adopted for a high-speed elevator.
However, as shown in
FIG. 13
, when a building with an elevator sways due to a sudden gust of wind or an earthquake, the coated chain
13
swings and the n se ems to shift over the rollers
14
at the downward side of the guides. On the other hand, at the upward side of the guides, the coated chain
13
is pulled by the car
1
or the counterweight
2
and goes up as it is. Accordingly, the coated chain
13
is strongly pressed against the rollers
14
and an angle bracket (not shown) supporting the rollers
14
at an acute angle, and then the coated chain
13
em its unpleasant noise due to resistance between the coated chain
13
and the rollers
14
. Further, since the coated chain
13
is caught in a corner of the rollers
14
, a rotation of the rollers
14
becomes difficult. As a result, the car
1
begins to vibrate, and the vibration may negatively influence the comfort of the ride in the car
1
.
SUMMARY OF THE INVENTION
Accordingly, one object of this invention is to provide a traction elevator having a compensating rope guide which can reduce the swing of a compensating rope so as to stop the emission of unpleasant noise and vibration of an elevator car, and thus avoid negatively influencing the comfort of the ride in the car.
The object of this invention can be achieved by providing an elevator having a rope connected at the first end thereof to the top of a car and at the. second end thereof to the top of a counterweight, and guided and driven by a sheave which is rotated by a motor, composed of a compensating rope suspended from the car to the counterweight, the compensating rope having a curving portion, a first linear portion on the car side of the curving portion and a second linear portion on the counterweight side of the curving portion for compensating an imbalance of weight between a portion of the rope on the car side of the sheave and a portion of the rope on the counterweight side of the sheave. A first guide is arranged to guide the first linear portion and the second linear portion. A second guide is arranged below the first guide and positioned between the extended lines of the first linear portion of the compensating rope and the second linear portion of the compensating rope for guiding. the curving portion of the compensating rope. A frame is arranged in the pit of an elevator shaft for supporting the first guide and the second guide.


REFERENCES:
patent: 2537075 (1951-01-01), Margles
patent: 3810529 (1974-05-01), Tosato et al.
patent: 3882968 (1975-05-01), Suozzo
patent: 5103937 (1992-04-01), Robertson
patent: 351112048 (1976-10-01), None
patent: 1-118967 (1989-08-01), None
patent: 404217579 (1992-08-01), None
patent: 5-178564 (1993-07-01), None
patent: 406064863 (1994-03-01), None
patent: 406211463 (1994-08-01), None
patent: 9-315728 (1997-12-01), None
Derwent English Abstract for Japanese Patent JP2000034073A, Feb. 2000.*
English Abstract, Japanese Patent JP353043346A, Apr. 1978.*
US Statutory Invention Registration, H702, whole document, Nov. 1989.

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