Traction type elevator

Details Traction type elevator Traction type elevator

1999-09-01

2002-09-03

Matecki, Kathy (Department: 3652)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support structure or arrangement

Reexamination Certificate

active

06443266

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a traction type elevator having a cage suspended by cables placed around car sheaves.
2. Description of the Background
FIG. 1
is a front view of one example of a traction type elevator, and
FIG. 2
is a perspective view of an elevator cage shown in FIG.
1
.
In FIG.
1
and
FIG. 2
, opposite ends of a cable
82
are secured to the upper part of a shaft
83
. The cable
82
is placed around a traction sheave
85
driven by a hoisting machine
84
having a motor (not shown). A cage
80
for accommodating passengers and a counter weight
86
for balancing the cage
80
are suspended by the cable
82
through a weight sheave
87
and car sheaves
81
of the cage
80
.
In this type of elevator, the cable
82
and the traction sheave
85
are located within the space between the cage
80
and a shaft wall
88
. Therefore, if the hoisting machine
84
driving the traction sheave
85
is located within the space between the cage
80
and the shaft wall
88
, the cage
80
can move up and down without expanding the size of the shaft
83
.
In general, when the cage
80
stops at a floor in order to let passengers on and off the cage
80
, the traction sheave
85
is locked by a brake (not shown) so as not to rotate. After passengers get on and off, at the time the cage
80
starts to move, the brake is off. The weight of the counter weight
86
is designed approximately half of the maximum permissible load of the cage
80
. That is, if the maximum permissible load of the cage
80
is 1,000 lbs, the weight of the counter weight
86
is 500 tbs. When passengers weighing a half of the maximum permissible load board the cage
80
, the cage
80
and the counter weight
86
are nearly balanced. Accordingly, if the upward bound cage
80
is filled with passengers at a floor, at the moment the brake is turned off in order to move the cage
80
upwardly, the cage
80
moves downwardly for a moment and then moves up as requested. On the contrary, if the downward bound cage
80
has no passengers at a floor, at the moment the brake is turned off in order to move the cage
80
, the cage
80
moves upwardly for a moment and then moves down in the right direction. To prevent the above unexpected sudden movement of the cage
80
, the motor of the traction sheave
85
is provided with a necessary torque according to a load of the cage
80
before the brake is turned off. The load of the cage
80
is detected by a load sensor. In conventional elevators, the cage has a “double” type construction in which the cage is composed of a cab for accommodating passengers and an outer frame supporting the cab through a rubber elastic member (see JP 10-119495), and the load detector is installed between the cab and the cage frame in order to detect the deformation of the rubber elastic member. Then the load of the cage
80
is calculated on the basis of the deformation of the rubber elastic member.
However, in the above mentioned elevator, since the car sheaves
81
near the cage
80
rotate fast in contact with the cable
82
, vibration and noise can be transferred to the cage
80
easily.
Further, vibration caused by a tension change of the cable
82
around the hoisting machine
84
can be transferred to the cage
80
via the car sheaves
81
.
To attenuate vibration and noise in the conventional elevator cage having the “double” construction as mentioned above, and elastic rubber members are installed between the cab and the cage frame. But this makes the cage
80
heavier and complicates the structure of the cage
80
.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to provide an elevator suspended by a cable through car sheaves, which can improve comfort of a ride in the cage without using the “double” construction in which the cage is surrounded and supported by an exterior frame.
This and other objects are achieved according to the present invention by providing a new and improved elevator including a cage configured to move up and down in a shaft along a guide rail, a plurality of car sheaves installed at a bottom of the cage, a cable placed around the car sheaves and configured to suspend the cage, a hoisting machine having a traction sheave configured to drive the cable, a base extending in a width direction of the cage and configured to support the car sheaves, and a first elastic member lying between the cage and the base.


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