Elevator door system

Details Elevator door system Elevator door system

1999-12-07

2002-01-22

Lillis, Eileen D. (Department: 3652)

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

C187S310000, C187S319000, C187S330000, C049S360000, C049S120000

Reexamination Certificate

active

06340073

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to an elevator door system for opening and closing a car door in an elevator system in connection with and together with a hatch door in each floor, and more particularly to an improved elevator clutch device for releasing a landing door lock device before operating the car door so to reduce vibration and noise in opening/closing the car door and hatch door as well as enable the elevator moving fast.
2. Description of the Prior Art
As well known to the skilled, the elevator system includes a car door installed to an elevator car moving through hoistway in a building, and a hatch door installed to a hall leading to the hoistway in each floor of the building. Therefore, in order that passengers board on or off the elevator, both of the car door and the hatch door should be opened. In addition, power is required to open the car and hatch doors, the elevator system employs only one driving source in the elevator so to open/close the car door and the hatch door together without using separate driving power sources in consideration of economy. Therefore, the elevator system needs another device for operating the car door and the hatch door together.
In order to open/close the car door and the hatch door together with use of one driving power source installed in the elevator, the elevator system commonly employs a clutch device for connecting the car door and the hatch door so to open/close together when the elevator stops at a floor. On the other hand, if the hatch door is opened by hand when the elevator car is not on a suitable position, there can be a risk of a person or matter to fall into the hoistway through the hatch door. Therefore, a landing door lock device is essential to the elevator system in order to lock the hatch door not opened by hand, and to unlock the hatch door only when the car door starts opening in state that the elevator car stops in a designated position.
FIG. 1
is a front view for showing a clutch device and a belt-type door driving unit employed in the conventional elevator system viewed from the hatch door.
FIG. 2
is a front view for showing the landing door lock device of the hatch door installed to the elevator system viewed from the car door. FIG.
3
and
FIG. 4
show states of the landing door lock device respectively locked and unlocked by the elevator clutch device. The conventional elevator clutch device in relation with such landing door lock device of the hatch door is explained with reference to the accompanying drawings.
Referring to
FIG. 1
at first, a driving motor
2
is mounted to a car frame
1
. The driving motor
2
drives a driving pulley
4
at a reduced rotating ratio through a belt
3
. In addition, the driving pulley
4
circulates a timing belt
6
connected to a driven pulley
5
. Left and right car doors
7
,
7
′ are integrally hung on hanger plates
8
,
8
′, which are movably suspended on a rail
9
mounted on the car frame
1
. Furthermore, one hanger plate
8
is configured to be directly led by the timing belt
6
. On the other hand, though not shown in the figure, the car doors
7
,
7
′ are connected to each other through a separate rope. When one door
7
moves, the rope moves the other door
7
′ to an opposite direction at the same time such that the car doors open.
In addition, a clutch device
10
is shown in FIG.
3
and
FIG. 4
as a conventional landing door lock device. As shown in
FIGS. 3 and 4
, the clutch device
10
includes a fixed clutch bar
12
and a movable clutch bar
13
mounted parallel vertically to a base
11
fixed to the hanger plate
8
of one car door
7
. Clutch arms
14
,
14
′ are mounted beside the movable clutch bar
13
in order to move the movable clutch bar
13
in parallel to the fixed clutch bar
14
. In addition, a cam plate
15
is fixedly mounted to a portion of the car frame
1
, and an interlocking roller
16
is connected to the movable clutch bar
13
. The cam plate
15
and the interlocking roller
16
are interlocked to change a space between the fixed and movable clutch bars
12
,
13
according to position of the car door
7
.
When the car doors
7
,
7
′ are closed, the interlocking roller
16
is seated on the cam plate
15
, whereby the movable clutch bar
13
of the clutch device
10
is lifted upward. Because the movable clutch bar
13
moves in linkage with the clutch arms
14
,
14
′, the space between the fixed and movable clutch bars
12
,
13
is broadened with the movable clutch bar
13
lifted. When the elevator car moves vertically, the fixed and movable clutch bars
12
,
13
move with the space broadened. In addition, when the elevator car moves vertically, a lock release roller
21
of the landing door lock device
20
mounted to one hanger plate
18
of the hatch doors
17
,
17
′in each floor shown in
FIG. 2
passes through the broadened space between the fixed and movable clutch bars
12
,
13
. When the elevator car stops at a hall in a certain floor, the lock release rollers
21
of the landing door lock device
20
are positioned between the fixed and movable clutch bars
12
,
13
as shown in FIG.
3
. Of course, before the car door opens, space between the fixed and movable clutch bars
12
,
13
is in broaden state, and at that time the latch
22
of the landing door lock device
20
is hooked up the locker
23
. Therefore, the hatch doors
17
,
17
′ are maintained not to be opened by hand.
When the car doors close as shown in
FIG. 3
, the driving motor
2
shown in
FIG. 1
is activated such that the car doors
7
,
7
′ are led by the timing belt
6
. Then, one car door
7
at which the clutch device
10
is installed moves to an opening direction (left in the drawing). Therefore, as shown in
FIG. 4
, the interlocking roller
16
comes down along the cam plate
15
so that the movable clutch bar
13
moves downward. At this time, the movable clutch bar
13
is particularly geared with the clutch arms
14
,
14
′ so to reduce distance to the fixed clutch bar
12
. If the space between the fixed and movable clutch bars
12
,
13
is narrowed, the lock release rollers
21
of the landing door lock device
20
interposed therebetween become upright from their inclined state (FIG.
3
). According to that, as shown in
FIG. 4
, the latch
22
fixed in a locking state by the lock release rollers
21
becomes released from the locker
23
. Therefore, from that time, the hatch door becomes led by the car door and opened at the same time with the lock release rollers
21
restrained in a narrowed space between the fixed and movable clutch bars
12
,
13
. Closing process of the hatch door and the car door is contrary to the above opening process.
In addition, a micro switch
24
is installed in the landing door lock device
20
. The micro switch
24
is in contact with an actuator
25
attached to the latch
22
when the landing door lock device
20
is in a locking state, while the micro switch
24
is turned off when the landing door lock device
20
is in an unlocking state. Therefore, when contacting with the micro switch
24
, the actuator
25
activates the micro switch
24
so to inform that the landing door lock device
20
is in the locking state.
However, in such conventional technique, a spatial gap is created because the clutch device should move a certain distance in order to release the landing door lock device of the hatch door after the car begins to open. Due to the spatial gap, when an initial opening speed is set fast, mechanical collision may arise in the release process of the landing door lock device. In addition, because the hatch door is hardly controlled in a process of closing up the car door, the hatch doors close with colliding with each other due to the speed of the car door. Such mechanical collision of the doors and severe vibration and noise caused therefrom may cause uneasiness of passengers and shorten lift cycle of the elevator system.
Therefore, the conventional elevator s

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