Elevator having vibration damping to attenuate vibration...

Details Elevator having vibration damping to attenuate vibration... Elevator having vibration damping to attenuate vibration...

1999-09-09

2003-11-04

Lillis, Eileen D. (Department: 3652)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support structure or arrangement

C187S264000, C187S292000, C187S345000

Reexamination Certificate

active

06640935

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application claims benefit of priority to Japanese Patent Application No. JP10-255516 filed Sep. 9, 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 an elevator having a cage suspended by cables putting 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 counterweight
86
for balancing the cage
80
are suspended by the cable
82
through a weight sheave
87
of the counterweight
86
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
.
The weight of the counterweight
86
is designed to be 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 counterweight
86
is 500 lbs. When passengers weighing half of the maximum permissible load board the cage
80
, the cage
80
and the counterweight
86
are nearly balanced.
As shown in
FIG. 3
, the cage
80
is composed of a cab
106
and a cage frame around the cab
106
. The cage frame is composed of a crosshead
104
, a pair of uprights
105
, a plank
109
is configured to be fitted between a pair of guide rails
103
. The cab
106
has a car platform
111
and the car platform is secured to the plank
109
through anti-vibration materials (not shown) such as rubber. A support base
121
having a pair of axles
123
is attached to a lower side of the plank
109
. The axles
123
are respectively arranged in parallel so as to be perpendicular to the cable
82
positioned between the car sheaves
81
and rotatably support the car sheaves
81
. The cable
82
is driven by traction between the cable
82
and the traction sheave
85
, and the cage
80
is moved up and down by the cable
82
along the guide rails
103
.
However, in the above mentioned elevator, since the car sheaves
81
installed near the car platform
111
experience high speed rotation in contact with the cable
82
, vibration and noise caused by the contact can be easily transferred to the cage
80
.
Further, vibration caused by a change in tension of the cable
82
around a hoisting machine can be transferred to the cage
80
via the car sheaves
81
. This tension change sometimes occurs at the time the torque of the motor of the hoisting machine
84
changes.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to provide an elevator suspended by a cable through car sheaves, wherein vibration transferred from the cable can be attenuated to improve comfort of a ride in the cage.
This and other objects are achieved according to the present invention by providing a new and improved elevator including a cage for accommodating passengers configured to move up and down in a shaft along a guide rail, a support base attached to a lower portion of the cage, a plurality of car sheaves rotatably secured to the support base through respective axles, a cable placed around the car sheaves and configured to suspend the cage, and at least one damper coupled to the cage and configured to attenuate vibration transferred from the cable to the cage.


REFERENCES:
patent: 4113064 (1978-09-01), Shigeta et al.
patent: 4977980 (1990-12-01), Hifumi
patent: 5027925 (1991-07-01), Kahkipuro
patent: 5613667 (1997-03-01), Ho
patent: 2 647 097 (1990-11-01), None
patent: 47-51625 (1972-12-01), None
patent: 4-144891 (1992-05-01), None
patent: 7-10421 (1995-01-01), None
patent: 2593288 (1996-12-01), None
patent: 9-208154 (1997-08-01), None
patent: 10-182035 (1998-07-01), None
European Search Report.

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