Elevator escape device

Details Elevator escape device Elevator escape device

2003-03-13

2004-05-25

Salata, Jonathan (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

C187S901000, C187S314000

Reexamination Certificate

active

06739431

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to escape devices of elevator and more particularly to an improved escape device for automatically opening door of an elevator in case of emergency.
BACKGROUND OF THE INVENTION
A conventional escape device of elevator is shown in FIG.
1
. The device comprises an activation assembly
100
and an operation assembly
200
. The activation assembly
100
is provided in a car
300
and comprises a rectangular window
101
hingedly coupled to a wall recess
302
, an electromagnetic switch
103
on a side of the recess
302
, a cylinder
104
inside the wall of the car
300
an exposed portion
105
in the cylinder
104
, a weight
106
received in the cylinder
104
, a plurality of ring grooves
107
around the weight
106
, a hook
110
at the exposed portion
105
, a spring
108
coupled to the hook
110
so that a sharp end of the hook
110
can support the weight
106
, a stop
120
in an inner surface of the window
101
for supporting the hook
110
, a magnet
111
within the wall of the car
300
for pivoting the hook
110
when the car
300
is stopped at a predetermined position of each floor, a rope
112
having one end inserted through the weight
106
, and a plurality of sheaves
113
for guiding the other end of the rope
112
to and secured to a first link
201
of the operation assembly
200
. The operation assembly
200
further comprises a rotating disk
202
coupled to the first link
201
, two opposite second links
203
having one ends pivotably coupled to the disk
202
, and two opposite sliding brackets
205
at the top of a door
204
.
In case of power outage including an emergency power supply failure, the car
300
is stopped immediately and the door
104
cannot be opened at this time. In response, the window
101
is opened automatically as the switch
103
is disabled. Next, the hook
110
is disengaged from the stop
120
and then is attracted by the magnet
111
for disengaging from the groove
107
. The weight
106
drops immediately to a bottom of the cylinder
104
. At the same time, one end of the rope
112
is pulled downward to cause the disk
202
to rotate as the rope
112
moves over the sheaves
113
to activate the first link
201
. Next, the brackets
205
move toward each other as activated by the second links
203
. Eventually, the door
204
is opened for enabling persons trapped in the car
300
to escape safely.
However, the prior art suffered from a disadvantage. For example, it can function well only after opening the window
101
and the hook
110
is disengaged from the groove
107
. Unfortunately, the automatic opening of the window
101
is often disabled in case of emergency. Thus, the need for improvement still exists.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an escape device of elevator comprising an activation assembly comprising a first rope extended down to a side of a car by passing a plurality of first sheaves, a second sheave coupled to one end of a first link, a third sheave in the car being coaxial with the second sheave, a pivot at the other end of the first link, a flexible board having one end coupled to the pivot, a second link having one end slidably coupled to an elongated groove in the first link and the other end coupled to a roller, a guide for permitting the second link to slide through, a projected limit member in the car, a bar proximate the other end of the first link, the bar being perpendicular to the first link, and a catch adjacent the bar, and an operation assembly comprising a second rope having one end coupled to a protrusion of a rotating disk, two opposite third links pivotably coupled to the rotating disk and a top of a door of the car respectively, a weight at the other end of the second rope, a vertical cylinder within a wall of the car for permitting the weight to slide therein, a plurality of fourth sheaves for guiding the second rope between the weight and the protrusion, an aperture in a wall of the cylinder, a spring depressible shaft adjacent the aperture, a wedge at one end of the shaft, the wedge being projected into the cylinder to support the weight in a normal state, a third rope coupled between the other end of the shaft and the other end of the flexible board, and a plurality of fifth sheaves for guiding the third rope between the other end of the shaft and the other end of the flexible board; wherein in response to a stop of the elevator in case of emergency, the first link pivots as the third sheave is rotated manually, the second sheave pivots to a position between the first sheaves so as to pull the first rope for activating the activation assembly, one end of the second link slides in the groove in response to the pivoting of the first link, the second link then moves toward the limit member along the guide, the bar pivots to be caught by the catch, the car will begin to lower as activated by the activation assembly if the car stops at a position between two adjacent floors, the roller is enabled by the limit member once the car has lowered to be flush with the immediately lower floor, the second link is pushed back to its original position, the first link returns to its original position, the bar is disengaged from the catch, the flexible board is flexed about the pivot to pull the third rope, the wedge moves out of the cylinder by the pulling of the third rope, the weight falls down to a lowest position in the cylinder as the support of the wedge is removed, the second rope is pulled to rotate the disk, the third links pivots in response to the rotation of the disk, and eventually the door is opened.
It is another object of the present invention to provide an escape device of elevator comprising an activation assembly comprising a first rope extended down to a side of a car by passing a plurality of first sheaves, a second sheave coupled to one end of a first link, a third sheave in the car being coaxial with the second sheave, a pivot at the other end of the first link, a flexible board having one end coupled to the pivot, a second link including a latched member and having one end slidably coupled to an elongated groove in the first link and the other end coupled to a roller, a guide for permitting the second link to slide through, a projected limit member in the car, a bar proximate the other end of the first link, the bar being perpendicular to the first link and including an elongated slot in its downstream, a spring biased lever slidably coupled to the slot, a driver powered by a standby power source for activating the spring biased lever, a limit switch adjacent the guide, an activation button on a wall of the car, and a catch adjacent the bar; and an operation assembly comprising a second rope having one end coupled to a protrusion of a rotating disk, two opposite third links pivotably coupled to the rotating disk and a top of a door of the car respectively, a weight at the other end of the second rope, a vertical cylinder within a wall of the car for permitting the weight to slide therein, a plurality of fourth sheaves for guiding the second rope between the weight and the protrusion, an aperture in a wall of the cylinder, a spring depressible shaft adjacent the aperture, a wedge at one end of the shaft, the wedge being projected into the cylinder to support the weight in a normal state, a third rope coupled between the other end of the shaft and the other end of the flexible board, and a plurality of fifth sheaves for guiding the third rope between the other end of the shaft and the other end of the flexible board; wherein in response to a stop of the elevator in case of emergency, the activation button is pushed manually, the driver is then activated, the spring biased lever is pulled down, the bar pivots downward to cause the spring biased lever to slide in the slot, the first link pivots to cause the second sheave to pivot to a position between the first sheaves so as to pull the first rope for activating the activation assembly, the car will begin to lower as acti

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