Load detector for elevator cage

Details Load detector for elevator cage Load detector for elevator cage

1999-04-16

2001-10-23

Salata, Jonathan (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

With monitoring, signalling, and indicating means

Monitors operational parameter

C177S147000

Reexamination Certificate

active

06305503

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application claims benefit of priority to Japanese Patent Application No. JP-0119495 filed Apr. 28, 1998, the entire disclosure of which is incorporated by reference herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a load detector for an elevator cage.
2. Description of the Background
An ordinary traction type elevator is composed as shown in FIG.
1
and FIG.
2
.
In
FIG. 1
, one terminal of a cable
2
is connected to a cage
1
and the other terminal of the cable
2
is connected to a counter weight via a sheave
31
of a hoisting machine
3
and deflector sheave
4
. The hoisting machine is composed of the sheave
31
and a motor
32
. The sheave
31
is driven by the motor
32
, and the cable
2
is driven by the traction between the sheave
31
and the cable
2
. Eventually, the cage
1
is moved up and down via the cable
2
.
As shown in enlarged
FIG. 2
, the cage
1
moves up and down along guide rails
7
by means of guide devices
6
attached to the cage
1
. The cage
1
is composed of a cage frame
1
A including a crosshead
1
A
a
, an upright
1
A
b
and a plank
1
A
c
, and a cab
1
B mounted in the cage frame
1
A. That is, construction of the cage
1
is in effect “doubled” by providing the cage frame
1
A around the cab
1
B, and the cab
1
B is supported by vibration-proof materials
1
C such as a rubber. The vibration-proof materials
1
C reduce vibration transfer from the cage frame
1
A to the cab
1
B and improve passenger comfort during travel of the cage
1
.
Further, a deformation detector
1
D is installed between the cage frame
1
A and the cab
1
B. The vibration-proof materials
1
C is pressed by the load of the cab
1
B, and the amount of the deformation of the vibration-proof materials
1
C is detected by the deformation detector
1
D. The amount of the deformation is transmitted to a calculator
11
in an elevator control panel via a transmitting cable
8
, a connector box
91
attached on a shaft wall
9
a
of a shaft
9
, and a transmitter
10
. The calculator
11
calculates the load of the cab
1
B or the load of passengers on the basis of the amount of the deformation from the deformation detector
1
D.
The calculator
11
also calculates a necessary torque to drive the motor
32
so as to move the cage
1
smoothly at the start time, and outputs the torque signal to a drive controller
12
. Accordingly, even if the cage
1
is filled with many passengers, the cage
1
does not move down suddenly at the start time when a brake is off. On the other hand, even if the cage
1
has no passengers, the cage
1
does not move up suddenly at the start time. That is, the drive controller
12
applies a necessary torque to the motor
32
before the brake is off so as to move the cage
1
smoothly at the start time.
In the above described traction type elevator, both the cage frame
1
A and the cab
1
B need a proper strength. It is not easy for the cage
1
to meet both the requirements of the proper strength and the capacity of the cab
1
B.
As the efficiency of the hoisting machine
3
improves, the vibration of the cage
1
has been reduced. Therefore, all cages are not required to be constructed in “double” in order to improve comfort of a ride in the cab
1
B.
But if the cage
1
has a “single” construction, that is to say, the cab
1
B is integrated with the cage frame
1
A, the deformation detector
1
D can not be installed between the cage frame
1
A and the cab
1
B. As a result, since a load of the cab
1
B can not be detected properly, the elevator has difficulty in controlling the torque applied to the motor
32
at the start time in accordance with change in the load.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to provide a load detector for an elevator which can detect the passenger load, even if a cab is integrated with a cage frame.
This and other objects are achieved by providing a new and improved load detector for an elevator having a cage moving up and down in a shaft for transporting passengers, and a cable supporting the cage, including a relative position detector configured to detect a relative position of the cage against the shaft; and a calculator configured to calculate a change of the relative position between the position of the cage just after landing at a floor and the position of the cage just before leaving the floor, and a load of the cage on the basis of the change of the relative position caused by an expansion and contraction of the cable.


REFERENCES:
patent: 4566341 (1986-01-01), Kovacs
patent: 4616321 (1986-10-01), Chan
patent: 4674605 (1987-06-01), McPherson
patent: 4766977 (1988-08-01), Yamasaki
patent: 4793442 (1988-12-01), Heckler et al.
patent: 5004076 (1991-04-01), Chen et al.
patent: 5124626 (1992-06-01), Thoen
patent: 5156239 (1992-10-01), Ericson et al.
patent: 5306879 (1994-04-01), Pearson
patent: 5435416 (1995-07-01), Siikonen et al.
patent: 5441127 (1995-08-01), Ikejima
patent: 5531294 (1996-07-01), Burton et al.
patent: 5852264 (1998-12-01), Muller

Affiliated with

Also associated with

Rating

Load detector for elevator cage does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Load detector for elevator cage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Load detector for elevator cage will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2578873