EP1860056A1

EP1860056A1 - Interlock device for car door of elevator

Info

Publication number: EP1860056A1
Application number: EP05720761A
Authority: EP
Inventors: Takeshi Mitsubishi Denki Kabushiki Kaisha FUJIKI
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2005-03-15
Filing date: 2005-03-15
Publication date: 2007-11-28
Also published as: EP1860056A4; JPWO2006097997A1; WO2006097997A1; CN1964911A; CN100593505C

Abstract

In an interlocking device for a car door of an elevator which is configured so that, in an engagement formation range where a car door 3 is engaged with the landing door 23 at a landing 21, the car door 3 is engaged with the landing door 23 to open and close; and, outside of the engagement formation range where the car door 3 is not engaged with the landing door 23 between the landings 21, opening operation of the car door 3 is blocked, a lever mechanism 7 which blocks opening operation of the car door 3 is provided on the car door 3; a part to be engaged 11 engaged with the lever mechanism 7 is provided on the car 1; and a cam 24 for restricting pivoting of the lever mechanism 7 is provided on the landing door 23. In a region where the car door 3 is not engaged with the landing door 23, opening operation of the car door 3 is mechanically blocked. The cam 24 for restricting pivoting of the lever mechanism 7 which blocks opening operation of the car door 3 is provided, thereby facilitating mounting operation of the cam 24; and the lever mechanism 7 which blocks opening operation of the car door 3 is of two axles 8 and 9, thereby allowing increased flexibility in mounting positions.

Description

TECHNICAL FIELD

The present invention relates to an interlocking device for a car door of an elevator which prevents passengers from manually opening the car door from inside the car when the elevator has stopped between landings due to a power failure or the like.

BACKGROUND ART

An elevator door is composed of a car door provided on the car side and a landing door provided at a landing doorway on each floor of a building. Opening and closing of these doors is performed by door opening equipment generally mounted on the car side; movement of the car door is transmitted to the landing door to simultaneously open or close the car door and the landing door by means of an engaging plate (not shown in the drawing) provided on the car door and an engaging plate engaging device (not shown in the drawing) provided on the landing door. Heretofore, passengers inside the car sometimes attempt to escape on one's own when the elevator car has stopped between landings (between floors) by an accident such as a power failure or the like, and there has been a possibility that passengers inside the car would unnecessarily open the car door while the elevator is moving. In such a case, if the elevator is in a range (section)
where the car door is engaged with the landing door, the landing door also opens along with the opening of the car door and passengers can escape from the inside of the car to a landing, though a slight step is generated between the car floor and the landing floor. Meanwhile, if the elevator is in a range (section) where the car door is not engaged with the landing door, the car door independently opens and passengers are approachable within a hoistway.
As a device for preventing such a situation, an interlocking device for a car door of an elevator as disclosed in patent document 1 has been proposed. However, in such an interlocking device, a control plate for restricting pivoting of a lever mechanism which blocks opening operation of the car door needs to be provided in the hoistway and therefore there is a problem in that mounting operation of the control plate is troublesome. Furthermore, the lever mechanism which blocks opening operation of the car door is of a single axle type and therefore there is a problem in that a mounting position thereof is restricted.
Patent Document 1: Japanese Unexamined Patent Application Publication No. 10-45360

DISCLOSURE OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

The present invention is implemented to solve the problem described above, and an object of the present invention is to provide a device which mechanically blocks opening operation of a car door in a region
where the car door is not engaged with a landing door. A cam for restricting pivoting of a lever mechanism which blocks opening operation of the car door is provided on the landing door to facilitate mounting operation of the cam and the lever mechanism which blocks opening operation of the car door is of two axes to increase flexibility in mounting positions.

MEANS FOR SOLVING PROBLEM

According to the present invention, there is provided an interlocking device for a car door of an elevator, which is configured so that, in an engagement formation range where a car door is engaged with a landing door at a landing, the car door is engaged with the landing door to open and close; and, outside of the engagement formation range where the car door is not engaged with the landing door between the landings, opening operation of the car door is blocked, the interlocking device for the car door of the elevator including: a lever mechanism having a first lever pivotally supported by the car door by a first axle, being pivotable in a locking direction and an unlocking direction of the car door; a second lever pivotally supported by the car door by a second axle, being pivotable in the locking direction and the unlocking direction of the car door; and a coupling rod for coupling both the levers so as to pivot in conjunction with the locking direction and the unlocking direction of the first lever and the locking direction and the unlocking direction of the second lever, respectively, and being biased so as to pivot in the locking direction; a part to be engaged provided on the car; an engaged part provided on the first lever, for engaging with the part to be engaged to block opening operation of the car door; a guide for having a first position which avoids so as not to engage the engaged part with the part to be engaged; and a second position which engages the engaged part with the part to be engaged, and provided on the car for guiding the first lever so as to locate at the first position or the second position in conjunction with opening and closing operation of the car door; and a cam provided on the landing door so as to be able to come into contact with an end of the second lever, for blocking pivoting of the second lever to the locking direction when the car door and the landing door are located in the engagement formation range, wherein when the car reaches the engagement formation range of the car door and the landing door, the end of the second lever comes into contact with the cam to block pivoting of the second lever and the first lever coupled thereto to the locking direction, and the first lever is retained in a middle position between the first position and the second position of the guide to enable opening operation of the car door, and when the car is located outside of the engagement formation range of the car door and the landing door, the first lever is guided to the guide to be placed at the second position, and the engaged part engages with the part to be engaged to block opening operation of the car door.

EFFECTS OF THE INVENTION

According to an interlocking device for a car door of an elevator of the present invention, in a region where the car door is not engaged with the landing door, the opening operation of the car door can be mechanically blocked. The cam for restricting pivoting of the lever mechanism which blocks the opening operation of the car door is provided, thereby facilitating mounting operation of the cam; and the lever mechanism which blocks the opening operation of the car door is of a two axle type, thereby allowing increased flexibility in mounting positions.

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment

An interlocking device for a car door of an elevator according to a first embodiment is configured so that it is possible to open a car door and a landing door when a car floor is located in a range where a specific engagement of the car door and the landing door is established above and below a landing floor is established; however, when the car floor is located out of the above-mentioned engagement formation range above and below the landing floor, locking is performed if the car door is opened by a certain settable distance L mm (for example, 20 to 30 mm) and the car door cannot be opened more than this distance.
Fig. 1 is a front view seen from the landing side, showing equipment configuration on the car side of the interlocking device for the car door of the elevator according to the first embodiment of the present invention. Fig. 2 is a front view seen from the car side of the landing door opposed to the car door shown in Fig. 1.
A car 1 is provided with a hanger rail 2 which is extendedly provided above a doorway of the car 1 in the width direction of the doorway. A car door 3 is hung from the hanger rail 2 by a hanger 4, which is fixed to an upper edge of the car door, and guided by the hanger rail 2 to open and close the doorway of the car 1. A motor 5 controls opening and closing of the car door 3 via a belt 6. A lever mechanism 7, to be described below, blocks opening operation of the car door 3, the lever mechanism being pivotally supported by the car door 3 by a first axle 8 and being pivotally supported by the car door 3 by a second axle 9. A guide 10, to be described below, is fixed to the car and guides the lever mechanism 7. A part to be engaged 11, to be described below, is engaged with the lever mechanism 7 to block opening operation of the car door 3 and is fixed to the car. In addition, the guide 10 and the part to be engaged 11 are integrally formed by bending steel.
In Fig. 2, a landing 21 is provided at each floor and a hanger rail 22 is extendedly provided in the width direction of the doorway on a hoistway side above the doorway of the landing 21. A landing door 23 is hung on the hanger rail 22 by a hanger 25, which is fixed to an upper edge of the landing door, and guided by the hanger rail 22 to open and close the doorway of the landing 21. Opening and closing of the car door and the landing door is performed by door opening equipment is often mounted on the car side; movement of the car door is transmitted to the landing door to simultaneously open or close the car door and the landing door by means of an engaging plate provided on the car door and an engaging plate engaging device (not shown in the drawing) provided on the landing door. Reference numeral 24 denotes a cam (restriction plate) provided on the landing door and, as to be described below, the lever mechanism 7 restricts operation which blocks opening operation of the car door 3.
Fig. 3 is a view showing the lever mechanism 7 for use in the first embodiment and the retaining state (unlocked state) of the lever mechanism 7 will be described. Fig. 4 is a view for explaining a locking state (locked state) of the lever mechanism 7 shown in Fig. 3. A first lever 31 of the lever mechanism 7 is pivotally supported by the car door 3 by means of the first axle 8, thereby allowing the first lever to pivot in a locking direction (counter-clockwise direction) and in an unlocking direction (clockwise direction). One end 31a of the first lever 31 has a roller 31b guided by the guide 10 (Fig. 5) and an engaged part 31c engaged with the part to be engaged 11 (Fig. 5).
A second lever 32 of the lever mechanism 7 is pivotally supported by the car door 3 by the second axle 9, thereby allowing the second lever to pivot in a locking direction (clockwise direction) and in an unlocking direction (counter-clockwise direction). One end 32a of the second lever 32 has a roller 32b that comes into contact with the cam 24 (Fig. 6). A coupling rod 33 for coupling both levers 31 and 32 is disposed between the other end 31d of the first lever 31 and the other end 32c of the second lever 32; and the locking direction and the unlocking direction of the first lever 31 pivot in conj unction with the locking direction and the unlocking direction of the second.lever 32, respectively.
The lever mechanism 7 having the first lever 31, the second lever 32, and the coupling rod 33 generates a moment 32d at the center of the second axle 9 of the second lever 32 due to an imbalance in mass; and the one end 31a of the first lever 31 is designed so as to be lowered at the center of the first axle 8 in a state where there is no external force. Arrows 33a, 31e, and 31f show a moving direction of the lever mechanism 7 due to an imbalance in mass. That is, it becomes a state shown in Fig. 4, as to be described below; it becomes a locking state (locked state). Further, a tensile spring 34 is provided so that a force of an arrow 34a is exerted between the second lever 32 and the car door 3 to generate the moment 32d of the same direction, thereby allowing assistance of operation.
Meanwhile, the state shown in Fig. 3 is the retaining state (unlocked state); and the roller 32b is pushed in a direction of an arrow A or the roller 31b is pushed in a direction of an arrow B, whereby the one end 31a of the first lever 31 rotates at the center of the first axle 8 to be raised. When the car door 3 is opened with this state retained, opening operation of the car door 3 (and the landing door 23) can be performed without the car door 3 being locked.
In a state where the car door 3 is completely closed, referring to Fig. 8, the roller 31b disposed on the first lever 31 is forcibly raised by the guide (raising plate) 10 provided on the car (fixing side of the car), so that the one end 31a of the first lever 31 is raised. This state is a state where the roller 31b is pushed in the direction of the arrow B in the retaining state shown in Fig. 3. If this state is retained, opening operation of the car door 3 (and the landing door 23) can be performed; however, when the car door 3 starts to open, the roller 31b moves downward along an inclined surface of the guide 10 and therefore locking is performed at a time when the car door 3 is opened by L mm in the case where a force of the arrow A is not exerted.
Each of Fig. 5 to Fig. 7 is a view for explaining in the case of an engagement formation range where the car floor is located within a specific range from above to below the landing floor. Fig. 5 is a view for explaining a completely closed state of the car door in which there exists a gap Ls between the roller 32b of the car door 3 and the cam 24 on the landing door 23 side. The roller 31b of the first lever 31 is retained by being raised to a first position of the guide 10. Fig. 6 is a view for explaining when the car door starts to open and showing a state where the roller 32b on the car door 3 side comes into contact with the cam 24 on the landing door 23 side. At this time, the roller 31b of the first lever 31 moves from the first position of the guide 10 to the middle between the first position and a second position so as to be retained with the one end 31a of the first lever 31 being slightly lowered. Fig. 7 is a view for explaining opening of the car door and showing that it is possible to open the car door 3 and the landing door 23 together while the roller 32b on the car door 3 side comes into contact with the cam 24 on the landing door 23 side.
Unlocking operation in the above-mentioned engagement formation range will be described with reference to Fig. 5 to Fig. 7. In the case where the car floor is located within the above-mentioned engagement formation range with respect to the landing floor, when the car door 3 starts to open (Fig. 6) from the completely closed state of the car door 3 shown in Fig. 5, the roller 32b on the car door 3 side comes into contact with the cam 24 disposed on the landing door 23 side; and the roller 31b of the first lever 31 of the lever mechanism 7 is retained in the middle between the first position and the second position of the guide 10. Therefore, the one end 31a of the first lever 31 is maintained with a state being raised (though slightly lowered). That is, the force of the arrow A in the retaining state shown in Fig. 3 is generated. Therefore, as shown in Fig. 7, the car door 3 can pass so that the engaged part 31c of the first lever 31 is not caught by the part to be engaged 11 on the car 1 side (fixing side of the car), thereby allowing opening operation of the car door 1.
In addition, at this time, the distance Ls between the roller 32b (end of the second lever 32) on the car door 3 side and the cam 24 on the landing door 23 side is set to be slightly larger than the gap (distance) of the engagement between the engaging plate provided on the car door 3 and the engaging plate engaging device provided on the landing door 23 so that the roller 31b of the first lever 31 can be securely moved to the middle between the first position and the second position of the guide 10. That is, the first lever 31 is configured so as to be retained with a slightly lowered position.
Each of Fig. 8 to Fig. 10 is a view for explaining a case outside of the engagement formation range where the car floor is located outside of the specific range from above to below the landing floor. Therefore, the cam 24 of the landing door 23 side is not existed in the pivoting range of the roller 32b of the second lever 32 of the car door 3. Fig. 8 is a view for explaining a completely closed state of the car door in which the roller 31b of the first lever 31 is retained by being raised to a first position of the guide 10. Fig. 9 is a view for explaining when the car door starts to open and the roller 31b of the first lever 31 starts to open from the first position of the guide 10 to the second position to lower the one end 31a of the first lever 31. Fig. 10 is a view for explaining locking of the car door in which the roller 31b of the first lever 31 moves to the second position of the guide 10 and the engaged part 31c of the first lever 31 on the car door 3 side is engaged with the part to be engaged 11 on the car side (fixing side of the car).
Locking operation outside of the above-mentioned engagement formation range will be described with reference to Fig. 8 to Fig. 10. In the case where the car floor is located outside of the above-mentioned engagement formation range with respect to the landing floor, even when the car door 3 starts to open (Fig. 9) from the completely closed state of the car door 3 shown in Fig. 8, the roller 32b on the car door 3 side does not come into contact with the cam 24 disposed on the landing door 23 side. Therefore, as shown in Fig. 10, when the roller 31b moves downward along the guide 10 of the first lever 31, the first lever 31 pivots at the center of the first axle 8 and the one end 31a can be moved downward.
At this time, a moment 32d is generated at the center of the second axle 9 of the second lever 32 due to an imbalance in mass of the lever mechanism 7 and the provided tensile spring 34 and the one end 31a of the first lever 31 is lowered to engage the engaged part 31c with the part to be engaged 11 of the car 1. Therefore, the first lever 31 is caught by the part to be engaged 11 of the car, so that opening operation of the car door 3 cannot be further performed. That is, the car door 3 is locked in a state in which the car door 3 is open by several tens of mm. Even when an elevator stops outside of an engagement formation range between landings, lack of oxygen for passengers can be prevented by slightly opening the car door 3.
In the first embodiment, since the cam 24 is provided on the landing door 23, operability is improved, as compared with the case of the cam 24 being provided in a hoistway. Further, the lever mechanism 7 provided on the car door 3 is composed of the first lever 31 pivotally supported by the first axle, the second lever 32 pivotally supported by the second axle, and the coupling rod 33 for coupling both the levers 31 and 32. Therefore, locations of both the levers 31 and 32 can be appropriately set, the first lever 31 can be located in the vicinity of the part to be engaged 11 of the car 1, and the second lever 32 can be located in the vicinity of the cam 24 of the landing door 23, respectively.
In addition, in the first embodiment, a part expressed as pivoting in the clockwise direction becomes a part expressed as pivoting in the counter-clockwise direction when the lever mechanism 7 is disposed on the opposite car door symmetrical to the center line of both the car doors.

Second Embodiment

Fig. 11 is a view for explaining a completely closed state of a car door having an interlocking device for a car door of an elevator according to a second embodiment. A point different from the first embodiment is that a pad (protruded stud) 41 for promoting pivoting when the first lever 31 does not pivot is provided on the car 1 side (fixing side of the car). Fig. 12 is a view for explaining a condition where the one end 31a of the first lever 31 comes into contact with the pad 41 when the car door 3 starts to open while the first lever 31 is not pivoted due to failure. Fig. 13 is a view for explaining a condition where the one end 31a of the first lever 31 is lowered downward while in contact with the pad 41.
In the case where the car floor is located outside of the above-described engagement formation range with respect to the landing floor, even when the car door 3 starts to open from the state shown in Fig. 11, the roller 32b on the car door 3 side does not come into contact with the cam 24 disposed on the landing door 23 side. That is, the force of the arrow A in the retaining state shown in Fig. 3 is not generated. Therefore, the force of the arrow B in the retaining state shown in Fig. 3 is lost when the roller 31b of the first lever 31 moves away from the guide 10. Therefore, the one end 31a of the first lever 31 can be moved downward. At this time, in a locking operation, a clockwise moment 32d is generated at the center of the second axle 9 of the second lever 32 due to an imbalance in mass of the lever mechanism 7 and the provided tensile spring 34 and the one end 31a of the first lever 31 is lowered to be locked.
However, in the case where the one end 31a of the first lever 31 does not move downward due to failure of the lever mechanism 7, for example, a part of the first axle 8 or the second axle 9 is not smoothly pivoted, the pad 41 comes into contact with the one end 31a of the first lever 31 and it is possible for people nearby to be informed of the abnormality by means of a collision sound. In the case where, a failure not due to damage of the lever mechanism 7, but due to the individual pivoting portions becoming hard and the like, the one end 31a of the first lever 31 is pushed down by the pad 41 as shown by the arrow 41a due to the above-mentioned contact, and it is possible for the locked state to be again obtained.
In addition, a position on which the pad 41 is mounted on the car 1 side (fixing side of the car) is located so that the one end 31a of the first lever 31 does not come in contact with the pad 41 during everyday operation, but it comes in contact with the pad 41 when failure occurs. That is, the one end 31a of the first lever 31 is lowered at the middle position between the first position and the second position during everyday operation even in the state shown in Fig. 6; during occurrence of failure, it is not lowered while located at the first position of the position guide 10 and therefore the position of the pad 41 of the car 1 is located between the first position and the middle position.
In this way, according to the second embodiment, in the case of a failure in which the lever mechanism 7 does not smoothly pivot, a situation where the car door 3 is not locked can be detected by abnormal sound outside of an engagement formation range and it is possible to promote pivoting. Furthermore, a detector, which informs people outside of the contact of the one end 31a of the first lever 31 and the pad 41, may be provided.
The interlocking device for the car door of the elevator of the present invention can be applied without being dependent on a door-opening system (double opening, single opening, or the like) and a driving system (belt type, link type, or the like).
Furthermore, although it is described that the locking range is the same as the engagement formation range between the car door and the landing door, the locking range can be individually set because constitutional equipment is independent.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a front view seen from the landing side, for showing equipment configuration on the car side of the interlocking device for the car door of the elevator according to the first embodiment of the present invention;
Fig. 2 is a front view seen from the car side of the landing door opposed to the car door shown in Fig. 1;
Fig. 3 is a view for explaining a retaining state of a lever mechanism for use in the first embodiment;
Fig. 4 is a view for explaining a locked state of the lever mechanism shown in Fig. 3;
Fig. 5 is a view for explaining a completely closed state of the car door in a case where the car floor is in the engagement formation range;
Fig. 6 is a view for explaining the starting of opening the car door in a case where the car floor is in the engagement formation range;
Fig. 7 is a view for explaining opening of the car door in a case where the car floor is in the engagement formation range;
Fig. 8 is a view for explaining a completely closed state of the car door in a case where the car floor is outside of the engagement formation range;
Fig. 9 is a view for explaining starting of opening of the car door in a case where the car floor is outside of the engagement formation range;
Fig. 10 is a view for explaining locking of the car door in a case where the car floor is outside of the engagement formation range;
Fig. 11 is a view for explaining a completely closed state of a car door in an interlocking device for a car door of an elevator according to a second embodiment;
Fig. 12 is a view for explaining a condition where a first lever comes into contact with a pad when the car door starts to open while the first lever is not pivoted due to failure; and
Fig. 13 is a view for explaining a condition where the first lever is lowered downward by coming into contact with the pad.

EXPLANATIONS OF LETTERS OR NUMERALS

1	car	2	hanger rail
3	car door	4	hanger
5	motor	6	belt
7	lever mechanism	8	first axle
9	second axle	10	guide
11	part to be engaged	21	landing
22	hanger rail	23	landing door
24	cam	25	hanger
31	first lever	31a	one end
31b	roller
	31c	engaged part
31d	other end	31e	arrow
31f	arrow
	32	second lever
32a	one end	32b	roller
32c	other end	32d	moment
33	coupling rod	33a	arrow
34	tensile spring	34a	arrow
41	pad	41a	arrow

Claims

An interlocking device for a car door of an elevator, which is configured so that, in an engagement formation range where a car door is engaged with a landing door at a landing, said car door is engaged with said landing door to open and close; and, outside of said engagement formation range where said car door is not engaged with said landing door between said landings, opening operation of said car door is blocked, said interlocking device for the car door of the elevator comprising:
a lever mechanism having a first lever pivotally supported by said car door by a first axle, being pivotable in a locking direction and an unlocking direction of said car door; a second lever pivotally supported by said car door by a second axle, being pivotable in the locking direction and the unlocking direction of said car door; and a coupling rod for coupling both said levers so as to pivot in conj unction with the locking direction and the unlocking direction of said first lever and the locking direction and the unlocking direction of said second lever, respectively, and being biased so as to pivot in said locking direction;

a part to be engaged provided on said car;

an engaged part provided on said first lever, for engaging with said part to be engaged to block opening operation of said car door;

a guide for having a first position which avoids so as not to engage said engaged part with said part to be engaged; and a second position which engages said engaged part with said part to be engaged, and provided on said car for guiding said first lever so as to locate at said first position or said second position in conjunction with opening and closing operation of said car door; and

a cam provided on said landing door so as to be able to come into contact with an end of said second lever, for blocking pivoting of said second lever to said locking direction when said car door and said landing door are located in said engagement formation range, wherein

when said car reaches said engagement formation range of said car door and said landing door, said end of said second lever comes into contact with said cam to block pivoting of said second lever and said first lever coupled thereto to said locking direction, and said first lever is retained in a middle position between said first position and said second position of said guide to enable opening operation of said car door, and

when said car is located outside of said engagement formation range of said car door and said landing door, said first lever is guided to said guide to be placed at said second position, and said engaged part engages with said part to be engaged to block opening operation of said car door.
The interlocking device for the car door of the elevator according to claim 1, further comprising a tensile spring provided between said second lever and said car door so as to pivot said lever mechanism in said locking direction.
The interlocking device for the car door of the elevator according to claim 1, wherein said guide and said part to be engaged are integrally formed to be fixed to said car.
The interlocking device for the car door of the elevator according to claim 1, wherein, in a state where said car door closes, a distance between said end of said second lever and said cam in said engagement formation range of said car door and said landing door is larger than an engaged distance between said car door and said landing door.
The interlocking device for the car door of the elevator according to claim 1, further comprising a pad provided on said car, said pad coming into contact with said first lever when said first lever does not pivot.