JP7663865B2 - Elevator - Google Patents

Description

The present invention relates to an elevator equipped with a door closing prevention device that prevents the landing doors from closing.

The landing door is provided at the landing entrance and is configured to close the landing entrance when no external force is acting. Therefore, when it is necessary to keep the landing door open, for example for maintenance work, a door closing prevention device described in Patent Document 1 has been used. This door closing prevention device consists of a lower end side part having a thickness dimension equal to or less than the groove width of the first guide groove of the first threshold arranged at the lower edge of the elevator entrance, and an upper end side part that is integrally extended from the lower end side part and has a maximum thickness dimension set to be larger than the groove width of the first guide groove. In addition, the vertical cross-sectional shape of the lower end side part and the upper end side part is trapezoidal by making the thickness between the lower end side part and the upper end side part an inclined shape that expands toward the upper end side part. Furthermore, the longitudinal dimensions of the lower end side portion and the upper end side portion are set so that when the door closing prevention device is attached to or detached from the first guide groove of the first threshold, a sufficient gripping margin is provided for pulling the lower end side portion out of the first guide groove or forcing the lower end side portion into the first guide groove. In addition, the length is set so that when the lower end side portion and the upper end side portion are press-fitted into the first guide groove, a pressure contact area is obtained that can generate a sufficient frictional force to prevent the door from closing.

JP 2007-22748 A

However, when using the door-closing prevention device described in Patent Document 1, the worker had to bend forward when pressing the door-closing prevention device into the first guide groove or pulling it out. This meant that the work of blocking the landing door from closing and releasing the door-closing prevention was a burden for the worker.

Therefore, the present invention aims to provide an elevator that simplifies the operation of preventing the door from closing.

The present invention is an elevator that includes a door closing prevention device provided on the hoistway side of a landing door that opens and closes between an elevator landing and a hoistway by sliding, and the door closing prevention device includes an engaging part that can be engaged by moving relative to an engaged part provided around the landing door, and that maintains the landing door in an open state by engaging with the engaged part, and a switching operation part that is operated by an operator, and the switching operation part switches the engaging part, which is in an engaged state in which it engages at least with the engaged part, to a non-engaged state in which it does not engage with the engaged part, by operation of the operator.

According to the above configuration, the operator can switch the engaging part from the engaged state to the disengaged state by operating the switching operation part, making it easy to switch from the engaged state to the disengaged state.

In the present invention, the switching operation unit may include an abutment portion provided on the landing door, and an abutment portion that is operated by the worker to move in a direction along the landing door and is prevented from moving by abutting against the abutment portion, and when the abutment portion is capable of abutting against the abutment portion from one side in the direction of movement, the switching operation unit may switch the engagement portion to the engaged state, and when the abutment portion is capable of abutting against the abutment portion from the other side in the direction of movement, the switching operation unit may switch the engagement portion to the disengaged state.

According to the above configuration, when the abutting portion is capable of abutting against the abutted portion from one side or the other side in the moving direction, the switching operation portion can switch the engaging portion between the engaged state and the disengaged state, thereby ensuring the engagement of the engaging portion.

In addition, in the present invention, the engaged portion may be disposed on the door opening side of the landing door in a fully open state, and when the landing door in the fully open state is moved toward the door opening side, the engaging portion may engage with the engaged portion.

According to this configuration, the engaging portion engages with the engaged portion outside the normal opening and closing range of the landing door, so the door closing prevention device is less likely to malfunction during normal opening and closing.

In the present invention, the switching operation unit may include an operation main body unit configured to switch the engagement unit from the engaged state to the disengaged state by being moved by the operator, and a biasing member having a restoring force that restores the operation main body unit in the moved state to the state before the movement.

According to the above configuration, the engagement portion is configured to be switched from the engaged state to the disengaged state by the movement of the operation main body, so that switching from the engaged state to the disengaged state can be easily performed, and the operation main body is restored to its state before movement by the restoring force of the biasing member, so that the operator can be saved the trouble of returning the operation main body to its state before movement.

As described above, according to the present invention, it is easy to switch from the engaged state to the disengaged state, which simplifies the operation of preventing the door from closing.

FIG. 1 is a diagram showing an overall outline of an elevator according to an embodiment of the present invention. FIG. 2 is a view of the landing door seen from the hoistway side in the elevator according to the first embodiment, showing the door closing prevention device having an engagement portion in a disengaged state. FIG. 3 is a view of the landing door seen from the hoistway side in the elevator according to the embodiment, showing a door closing prevention device having an engaging portion in an engaged state. FIG. 11 is a diagram of the landing door seen from the hoistway side in an elevator according to a second embodiment, showing the door closing prevention device in a disengaged state. 4 is a diagram showing details of the door closing prevention device according to the embodiment; FIG. 11A to 11C are diagrams for explaining a procedure for preventing the landing door from closing by the door closing prevention device in the embodiment. 5A to 5C are diagrams showing a procedure for closing a landing door in the embodiment. 13A and 13B are diagrams illustrating a configuration of a door closing prevention device according to a third embodiment. 5A to 5C are diagrams showing a procedure for closing a landing door in the embodiment.

Below, the elevator 1 according to the first to third embodiments of the present invention will be described in order. Here, it is important to note that the elevator 1 according to the first to third embodiments is equipped with a door closing prevention device 5. Therefore, for convenience of explanation, the basic configuration of the elevator 1 will be explained before explaining the door closing prevention device 5, and this explanation will also be applied to the elevator 1 according to the first to third embodiments.

In the following description, the direction in which the landing doors 42 and the car doors 31 open and close is referred to as the "opening/closing direction X", the direction in which people and objects pass between the car 3 and the elevator landing 4 via the car-side entrance 3a and the landing-side entrance 40 is referred to as the "entrance/exit direction Y", and the direction in which the car 3 moves up and down the hoistway 2 is referred to as the "ascending/decreasing direction Z". The opening/closing direction X, the entrance/exit direction Y, and the ascending/decreasing direction Z are perpendicular to each other. Since the car 3 moves up and down, the ascending/decreasing direction Z coincides with the up and down direction. Furthermore, in the opening/closing direction X, the side on which the landing doors 42 and the car doors 31 close is referred to as the "door-closing side", and the opposite side is referred to as the "door-opening side".

As shown in FIG. 1, elevator 1 includes a hoistway 2 defined by the walls of a building so as to extend in the ascending/descending direction Z, a car 3 that ascends and descends within hoistway 2, and an elevator hall 4 provided on a specific floor of the building. Note that multiple elevator halls 4 are provided in the ascending/descending direction Z.

The car 3 includes a box-shaped car body 30 with a car-side entrance 3a that opens on the front, and a car door 31 that opens and closes the car-side entrance 3a. The car door 31 is configured to be driven to open and close by the driving force of a door drive mechanism 3b (specifically, a motor) provided on the car body 30. Thus, the car door 31 is configured to close the car-side entrance 3a when the car 3 is ascending or descending in the elevator shaft 2, and to open and close the car-side entrance 3a when the car 3 has arrived at the elevator hall 4. The car door 31 in this embodiment is a so-called center-open type (double-swing type) door.

As shown in FIG. 1, the elevator hall 4 is provided with a hall-side entrance 40 provided in the wall separating the elevator hall 4 from the hoistway 2, a hall-side threshold 41 provided at the end of the hoistway 2, and a hall door 42 for opening and closing the hall-side entrance 40. The hall-side entrance 40 is an opening of a size corresponding to the car-side entrance 3a.

The landing side threshold 41 is for guiding the landing door 42 in the opening/closing direction X. As shown in FIG. 2, the landing side threshold 41 extends in the opening/closing direction X at the lower end of the landing side entrance/exit 40. The landing side threshold 41 is longer than the landing side entrance/exit 40 in the opening/closing direction X. A guide groove 410 is formed in the landing side threshold 41 so as to extend in the opening/closing direction X. This guide groove 410 is formed so as to span the entire area of the landing side threshold 41 in the opening/closing direction X.

The landing door 42 is for opening and closing the landing side entrance 40. As shown in FIG. 2, the landing door 42 includes a door body 420 that separates the elevator landing 4 from the hoistway 2, and a door drive unit 421 that drives the door body 420 in the opening and closing direction X. Note that the landing door 42 in this embodiment is a center-opening door that includes two door bodies 420, 420 that are similarly configured.

The door body 420 is composed of a plate-like member. The door body 420 includes a door panel 420a extending in a plane direction (specifically, the opening/closing direction X and the lifting direction Z) perpendicular to the entrance/exit direction Y of the landing side entrance 40, a door-closing side fold-back portion 420b and a door-opening side fold-back portion 420c provided on the edge of the door-closing side and the door-opening side of the door panel 420a, respectively, and a lower end fold-back portion 420f provided on the lower end edge. The door panel 420a of this embodiment is rectangular and elongated in the lifting direction Z. The door-closing side fold-back portion 420b, the door-opening side fold-back portion 420c, and the lower end fold-back portion 420f are formed by folding back a plate-like member to the back side of the door panel 420a. In addition, each of the door-closing side folded portion 420b and the door-opening side folded portion 420c has a first portion 420d that extends from the edge of the door panel 420a to the back side of the door panel 420a, and a second portion 420e that extends from the first portion 420d toward the folded portions 420b and 420c on the opposite side.

As shown in FIG. 2, the door drive unit 421 includes a door rail 421a extending in the opening/closing direction X at an upper position of the landing side entrance 40 (specifically, the wall in the elevator 2), and a door hanger 421b that can reciprocate in the opening/closing direction X along the door rail 421a with the door panel 420a suspended. The door hanger 421b is attached to the door rail 421a. In this embodiment, two door hangers 421b, 421b are provided. The two door hangers 421b, 421b are configured to move in conjunction with the door opening side and the door closing side. Therefore, for example, when one door hanger 421b moves to the door closing side, the other door hanger 421b also moves to the door closing side. Furthermore, the door hanger 421b is configured to automatically move to the door closing side when no external force is applied.

In FIG. 2, the upper side of the door body 420 is hung from the door hanger 421b with the back surface of the door panel 420a positioned on the elevator shaft 2 side. The lower side of the door body 420 is fitted into the guide groove 410. In this way, the landing door 42 is positioned on the landing side threshold 41. Therefore, by moving the door hanger 421b, the door body 420 can slide to open and close the landing side entrance/exit 40.

The landing door 42 is provided with a locking device 7 that locks the landing door 42 when it is closed, and an unlocking device 8 that can unlock the lock set by the locking device 7. In this embodiment, the locking device 7 and the unlocking device 8 are provided on one of the landing doors 42 (the right side in Figures 2 and 3).

The lock device 7 has a first engagement member 70 provided on the door rail 421a and a second engagement member 71 provided on the door hanger 421b. The first engagement member 70 is disposed between the two door hangers 421b, 421b. This first engagement member 70 has an engagement piece 700 that extends in the lifting/lowering direction Z.

As shown in FIG. 2, the second engagement member 71 is configured to be displaceable between an engagement position where it engages with the first engagement member 70 and a release position where it releases the engagement with the first engagement member 70 by rotating around the entry/exit direction Y. Specifically, the second engagement member 71 includes a hook 710 provided on the door closing side and a shaft portion 711 provided on the lower side.

The unlocking device 8 is provided in the door body 420. The unlocking device 8 in this embodiment is a keyhole 8 penetrating the door panel 420a. This keyhole 8 is located on the upper side of the door panel 420a, specifically, on the lower side of the shaft portion 711. The keyhole 8 is located on the door closing side rather than the center of the opening and closing direction X of the landing door 42. A key owned by an operator is inserted into this keyhole 8. This key is a shaft-shaped member having a length that can be inserted into the keyhole. The key is configured so that the tip of the key in the insertion direction is bent by its own weight. Therefore, when the key is inserted into the keyhole 8 and the tip is bent by its own weight, and then the key is turned, the tip of the key abuts against the shaft portion 711, and the second engagement member 71 moves. In this way, the engagement state between the first engagement member 70 and the second engagement member 71 is released, and the landing door 42 is unlocked.

The above is an explanation of the basic configuration of the elevator 1. Next, we will explain the unique configuration of the elevator 1 of the first embodiment.

As shown in Figures 2 and 3, in the elevator 1 of this embodiment, a notch 420g is formed in the lower end fold-back portion 420f, penetrating the elevator in the ascending/descending direction Z. This notch 420g is positioned on the door-opening side of the door-closing fold-back portion 420b.

The elevator 1 is provided with a door closing prevention device 5 that prevents the landing door 42 in the door open state from closing. As shown in FIG. 2, the door closing prevention device 5 is provided on the elevator shaft side of the landing door 42 (specifically, on the back side of the door panel 420a). The door closing prevention device 5 is also arranged between the door closing side folded part 420b and the door opening side folded part 420c. Furthermore, the door closing prevention device 5 is arranged between the second part 420e and the door panel 420a in the ingress/egress direction Y. The door closing prevention device 5 is provided with an engagement part 50 that can be engaged with an engaged part provided around the landing door 42, and a switching operation part 51 that switches the engagement part 50 between an engaged state in which it engages with the engaged part and a non-engaged state in which it does not engage with the engaged part.

Here, the engaged portion in this embodiment is a guide groove 410 formed in the landing side threshold 41. The lower side of the door body 420 fits into the guide groove 410. Therefore, in this embodiment, the guide groove 410, which is the engaged portion, is disposed on the lower side of the landing door 42, which is the periphery of the landing door 42.

For ease of explanation, the switching operation unit 51 will be described before the engagement unit 50. The switching operation unit 51 includes an operation main body unit 510 that is moved by the operation of an operator, and an abutment unit 511 that is fixedly provided on the landing door 42 (specifically, the back surface of the door panel 420a).

The operating body 510 of this embodiment includes a pair of pulleys 510a, 510a attached to the door panel 420a in a state in which they can rotate freely around the entry/exit direction Y, an endless looped cord 510b (specifically, a wire rope), and an abutment portion 510c provided on the cord 510b.

In this embodiment, the pair of pulleys 510a, 510a are arranged in a state separated in the lifting direction Z. Specifically, the upper pulley 510a is arranged above the center of the lifting direction of the door panel 420a, and the lower pulley 510a is arranged below the center of the lifting direction of the door panel 420a (in this embodiment, near the lower end folded part 420f). The upper pulley 510a is arranged at a position away from the rotation trajectory of the key inserted into the keyhole 8. Furthermore, in this embodiment, the rotation center of the lower pulley 510a is arranged on the door opening side of the lower end folded part 420f. The cord-like body 510b is wound around the pair of pulleys 510a, 510a and extends in the lifting direction Z. Note that the cord-like body 510b is tensioned to such an extent that the abutment part 510c described later does not deviate significantly in the opening and closing direction X.

The abutting portion 510c is intended to prevent the movement of the engaging portion 50 by abutting against the abutted portion described later. The abutting portion 510c is made of a harder material than the abutted portion described later. The abutting portion 510c is disposed on the door closing side from the center of the opening and closing direction X of the landing door 42. Specifically, the abutting portion 510c protrudes from the cord-like body 510b wound around the pair of pulleys 510a, 510a toward the door closing side. Therefore, when the cord-like body 510b is moved to rotate the pair of pulleys 510a, 510a, the abutting portion 510c moves in the lifting direction Z. Therefore, in this embodiment, the abutting portion 510c moves in the lifting direction Z, which is the direction along the landing door 42. In addition, the abutting portion 510c in this embodiment is disposed between the pair of pulleys 510a, 510a (near the center of the lifting direction Z of the landing door 42).

In FIG. 2, the contact portion 510c is arranged so that it can contact the contacted portion 511 (described later) from above in the lifting direction Z, which is the other side of the direction of movement. On the other hand, in FIG. 3, the contact portion 510c is arranged so that it can contact the contacted portion 511 (described later) from below in the lifting direction Z, which is one side of the direction of movement.

The abutment portion 511 is for preventing the movement of the abutment portion 510c by abutting the abutment portion 510c. The abutment portion 511 is configured to be able to abut against the moving abutment portion 510c. The abutment portion 511 of this embodiment is a triangular shape that becomes shorter in the lifting direction Z as it approaches the door opening side. The abutment portion 511 of this embodiment is configured of an elastically deformable member. Here, the elastic force of the abutment portion 511 (specifically, the force that allows the abutment portion 510c to move in the lifting direction Z) is stronger than the force generated by the weight of the abutment portion 510c and weaker than the force in the lifting direction Z applied to the abutment portion 510c by the operator's operation. The abutment portion 511 is arranged at a position where it can abut against the moving abutment portion 510c. The abutment portion 511 of this embodiment is arranged on the door closing side of the abutment portion 510c. The contact portion 511 is disposed on the door-opening side of the closed-side folded portion 420b. Furthermore, the contact portion 511 is disposed between the door panel 420a and the second portion 420e in the ingress/egress direction Y. In addition, the contact portion 511 is disposed between the pair of pulleys 510a, 510a.

The engaging portion 50 is for preventing the landing door 42 from closing. The engaging portion 50 in this embodiment is made of a compressible elastic member (e.g., rubber). The engaging portion 50 in this embodiment is cylindrical. The engaging portion 50 in this embodiment is configured to be insertable into the notch 420g. The engaging portion 50 can be fitted into the guide groove 410 in a compressed state. The engaging portion 50 in this embodiment protrudes radially outward from the lower pulley 510a. Therefore, in this embodiment, the engaging portion 50 and the switching operation portion 51 are configured as one unit. Therefore, the engaging portion 50 is configured to move (specifically, rotate) around the ingress/egress direction Y in accordance with the rotation of the pulley 510a. Therefore, in this embodiment, the engaging portion 50 is configured to be switchable between an engaged state in which the engaging portion is engaged by being fitted into the guide groove 410 as shown in FIG. 3, and a non-engaged state in which the engaging portion is not engaged by not being fitted into the guide groove 410 as shown in FIG. 2.

The above is an explanation of the configuration of the elevator 1 of the first embodiment. Next, we will explain how to prevent the landing door 42 from closing by the elevator 1 of the first embodiment and how to release the prevention. Note that the prevention of the door closing is performed by a worker, for example, before maintenance work to inspect the elevator 1, and the prevention of the door closing is released by the same worker after the maintenance work.

When preventing the elevator 1 of the first embodiment from closing, first, the worker unlocks the locking device 7 using the unlocking device 8. Specifically, the worker first inserts the key into the keyhole 8. Then, the worker rotates the key, whose tip is bent under its own weight, around the entry/exit direction Y to bring the tip of the key into contact with the shaft portion 711. As a result, the shaft portion 711 is pushed by the tip of the key around the entry/exit direction Y, and the second engaging member 71 rotates around the entry/exit direction Y. Therefore, the second engaging member 71 is displaced from the engaged position to the released position, and the engagement between the first engaging member 70 and the second engaging member 71 is released. Therefore, the locking device 7 can be unlocked.

Next, the worker opens the landing door 42. Specifically, the worker moves the landing door 42, which is in a state where the landing side entrance 40 is completely closed (hereinafter, fully closed state), to the door opening side, thereby opening the landing door 42. In this embodiment, the worker moves the door bodies 420, 420 to the door opening side, thereby opening the landing door 42 to the most open state (hereinafter, fully open state).

Next, the worker operates the switching operation unit 51 to switch the engaging unit 50 from the non-engaged state to the engaged state. Specifically, as shown in FIG. 2, while keeping the landing door 42 in the open state, the worker reaches his/her hand to the rear side of the door panel 420a, grasps the abutting portion 510c, and moves it downward. Here, the abutted portion 511 is disposed in a position where it can abut against the moving abutting portion 510c. Therefore, when the abutting portion 510c is moved downward by the worker's operation, the abutting portion 511 is elastically deformed by the abutting portion 510c. Then, as shown in FIG. 3, the abutting portion 510c is disposed below the abutting portion 511.

When the abutment portion 510c moves downward, the pulley 510a rotates via the cord-like body 510b. As shown in FIG. 3, the engagement portion 50 rotates so that its position and angle change following the rotation and fits into the guide groove 410 via the notch 420g. At this time, the engagement portion 50 is fitted into the guide groove 410 in a compressed state. Therefore, in this embodiment, the engagement portion 50 moves from a non-engaged state to an engaged state in which it engages with the guide groove 410, which is the engaged portion, by rotating with respect to the guide groove 410. Note that in this embodiment, the engagement between the engagement portion 50 and the engaged portion, which is the guide groove 410, is performed on the door-opening side of the door-closing fold-back portion 420b.

Therefore, when a force in the door closing direction is applied to the door body 420 by the door hanger 421b, which is configured to automatically move in the door closing direction when no action is taken, the frictional engagement of the engaging portion 50 with the inner surface of the guide groove 410, which is the engaged portion, prevents the landing door 42 from closing.

On the other hand, when the elevator 1 of the first embodiment is to release the prevention of the landing door 42 from closing, the worker operates the switching operation unit 51 to switch the engaging unit 50 from the engaged state to the disengaged state. Specifically, the worker puts his/her hand around the back side of the door panel 420a to grasp the abutting portion 510c, and moves the abutting portion 510c above the abutted portion 511 while elastically deforming the abutted portion 511 with the abutting portion 510c. This causes the pulley 510a to rotate via the cord-like body 510b, and the engaging portion 50 rotates around the ingress/egress direction Y in conjunction with the rotation. Therefore, the engaging portion 50 comes out of the guide groove 410 and switches to the disengaged state. Therefore, by switching the engaging portion 50 to the disengaged state, the frictional engagement of the engaging portion 50 with the inner surface of the guide groove 410 is released, and the landing door 42 is closed.

That is, as shown in FIG. 2, when the abutting portion 510c abuts against the abutted portion 511 from above in the lifting/lowering direction Z, the switching operation portion 51 puts the engaging portion 50 in a disengaged state, and as shown in FIG. 3, when the abutting portion 510c abuts against the abutted portion 511 from below, the switching operation portion 51 puts the engaging portion 50 in an engaged state.

As described above, in this embodiment, the engagement portion 50 protrudes radially outward from the lower pulley 510a. When the contact portion 510c is moved downward, the pulley 510a rotates via the cord-like body 510b, and the engagement portion 50, which has rotated so that its position and angle change in response to the rotation, fits into the guide groove 410. This switches the engagement portion 50 to an engaged state. Therefore, the operator can switch the engagement portion 50 to an engaged state by operating the contact portion 510c, making the switch easy. Also, when the contact portion 510c is moved upward, the engagement portion 50 can be switched to a non-engaged state.

Specifically, in this embodiment, the abutment portion 510c moves in the lifting direction Z, causing the pulley 510a to rotate and the engagement portion 50 to switch between an engaged state and a disengaged state, making it easy to switch the state of the engagement portion 50.

In addition, in this embodiment, the engaging portion 50 rotates so that its position and angle change following the rotation of the pulley 510a, and is engaged by fitting into the guide groove 410. Therefore, the degree to which the engaging portion 50 fits into the guide groove 410 can be kept constant regardless of the physique of the worker or the way in which force is applied.

As shown in FIG. 2, in this embodiment, when the engaging portion 50 is in a disengaged state, the contacting portion 510c contacts the contacted portion 511 from above. Here, the elastic force of the contacted portion 511 (specifically, the force that allows the contacting portion 510c to move in the lifting direction Z) is stronger than the force generated by the weight of the contacting portion 510c. Therefore, it is possible to prevent the contacting portion 510c from moving lower than the contacted portion 511 while elastically deforming the contacted portion 511, regardless of the operator's intention, and the engaging portion 50 from entering an engaged state. Furthermore, in this embodiment, it is also possible to prevent the contacting portion 510c from moving higher than the contacted portion 511, regardless of the operator's intention, and the engaging portion 50 from entering a disengaged state.

In addition, in this embodiment, the engagement portion 50 is switched between an engaged state and a disengaged state by moving the abutment portion 510c in the lifting/lowering direction Z. This makes the work easier since the worker only needs to apply force in the lifting/lowering direction Z.

In addition, in this embodiment, the unlocking device 8 is disposed above the door closing prevention device 5. The abutment portion 510c is disposed near the center of the lifting direction Z of the landing door 42. Therefore, when preventing the landing door 42 from closing, the worker first changes his/her posture by, for example, stretching his/her arms upward, unlocks the locking device 7 by the unlocking device 8 at the top, and then moves the landing door 42 slightly to the door opening side. After that, the worker returns to his/her posture and moves the landing door 42 to the fully open position. Then, the worker can prevent the landing door 42 from closing by moving the abutment portion 510c downward while maintaining the returned posture. Therefore, according to this embodiment, the worker can prevent the landing door 42 from closing while maintaining the posture of moving the landing door 42 to the fully open position without significantly changing his/her posture by, for example, leaning forward. The same applies when releasing the prevention of the landing door 42 from closing.

In addition, in this embodiment, the keyhole 8 and the abutment portion 510c are disposed on the door closing side from the center of the opening and closing direction X of the landing door 42. Therefore, unlocking by the unlocking device 8 and preventing the door from closing by the door closing prevention device 5 can be performed on the door closing side from the center of the opening and closing direction X of the landing door 42.

In addition, in this embodiment, the door closing prevention device 5 is positioned away from the rotation trajectory of the key inserted into the keyhole 8. This prevents the door closing prevention device 5 from interfering with the unlocking process when an operator unlocks the lock device 7.

In addition, in this embodiment, the engagement between the engaging portion 50 and the engaged portion is performed on the door-opening side of the door-closing fold-back portion 420b. This prevents, for example, the foot of a worker from coming into contact with the engaged engaging portion during maintenance work.

In addition, in this embodiment, the abutment portion 510c protrudes from the cord-like body 510b that is wound around the pair of pulleys 510a, 510a toward the door closing side. Therefore, when an operator reaches his/her hand to the back side of the door panel 420a, the abutment portion 510c can be easily reached.

In addition, in this embodiment, the door closing prevention device 5 is disposed between the door closing side fold portion 420b and the door opening side fold portion 420c. Therefore, when an operator operates the switching operation unit 51, the door closing side fold portion 420b and the door opening side fold portion 420c can be prevented from interfering with the operation.

In addition, in this embodiment, the door closing prevention device 5 is disposed between the second portion 420e and the door panel 420a in the ingress/egress direction Y. This prevents the door closing prevention device 5 from interfering with the opening and closing of the landing door 42. In addition, the door closing prevention device 5 is prevented from interfering with the car 3.

Next, the unique configuration of the elevator 1 according to the second embodiment will be described. The second embodiment shown in Figures 4 to 7 differs from the first embodiment mainly in the arrangement of the notch 420g and the configuration of the engaged portion and the door closing prevention device 5. Therefore, the second embodiment will be described with an emphasis on the differences from the first embodiment.

First, as shown in FIG. 5, in the second embodiment, a notch 420g is formed in the first portion 420d of the door-opening side folded portion 420c, penetrating in the opening/closing direction X. This notch 420g is disposed approximately in the center of the landing door 42 in the lifting/lowering direction Z.

As shown in FIG. 4, in the second embodiment, the engaged portion is provided on the wall separating the elevator hall 4 and the hoistway 2. Specifically, the engaged portion in this embodiment is a protruding member 6 that protrudes from the wall separating the elevator hall 4 and the hoistway 2 toward the hoistway 2 (the front side of the paper in FIG. 4). The protruding member 6, which is the engaged portion, is positioned on the door opening side of the hall door 42 in the fully open state. Also, the protruding member 6, which is the engaged portion in this embodiment, is positioned approximately in the center of the hall door 42 in the lifting direction Z.

As shown in FIG. 4, the door closing prevention device 5 of the second embodiment is disposed below the unlocking device 8. Specifically, the door closing prevention device 5 of this embodiment is disposed approximately in the center of the lifting direction Z of the landing door 42.

The door closing prevention device 5 of the second embodiment includes an engagement portion 50 and a switching operation portion 51, similar to the first embodiment. As shown in FIG. 5, in the door closing prevention device 5 of the second embodiment, the engagement portion 50 and the switching operation portion 51 are configured as separate bodies. The engagement portion 50 of the second embodiment includes an engagement rotation portion 500 that rotates around the ingress/egress direction Y, and an engagement main body portion 501 that can engage with the engaged portion.

As shown in FIG. 5, the engaging rotation part 500 includes a rotating body part 500a fixed to the door panel 420a in a state in which it can rotate around the entrance/exit direction Y, and an engaging shaft part 500b extending from the rotating body part 500a to the door opening side. As shown in FIG. 5, the rotating body part 500a is a member extending in the ascending/descending direction Z. In this embodiment, the upper end of the rotating body part 500a is fixed to the door panel 420a. In addition, the rotating body part 500a of this embodiment is disposed on the door closing side of the second part 420e of the door opening side fold part 420c. On the other hand, the engaging shaft part 500b of this embodiment is provided at the upper end of the rotating body part 500a. Furthermore, the engaging shaft part 500b extends to the door opening side of the landing door 42 through the cutout 420g.

The engagement body 501 is provided at the end of the engagement shaft 500b on the door-opening side. As shown in FIG. 5, the engagement body 501 in this embodiment protrudes downward from the engagement shaft 500b. The engagement body 501 also has a tapered surface 501a that slopes upward toward the door-opening side, and an abutment surface 501b that extends in the lifting direction Z.

The switching operation unit 51 includes an operation main body 510 having a flange 510a and extending in the opening/closing direction X, two insertion parts 511, 511 fixedly provided on the door panel 420a and inserted on the door-opening side and the door-closing side while allowing the operation main body 510 to move in the opening/closing direction X, and a biasing member 512 (specifically, a compression spring) disposed on the door-opening side of the flange 510a and between the two insertion parts 511, 511. In this embodiment, the operation main body 510 is inserted into guide members 513, 513 fixed to the door panel 420a on the door-opening side and the door-closing side of the two insertion parts 511, 511.

The operation body 510 of this embodiment is a columnar member (specifically, a cylindrical member). As shown in FIG. 5, the operation body 510 has a gripping portion (not numbered) that is gripped by the operator on the door closing side of the guide member 513 on the door closing side. This gripping portion is disposed between the second portion 420e of the door closing fold-back portion 420b and the guide member 513 on the door closing side.

The operation main body 510 abuts against the rotating main body 500a from the door-closing side. Therefore, the switching operation part 51 in this embodiment is disposed on the door-closing side of the engagement part 50. Specifically, the switching operation part 51 is disposed between the door-closing fold-back part 420b and the door-open fold-back part 420c in the opening/closing direction X. The operation main body 510 is also configured to be movable from the state shown in FIG. 5 to the door-opening side. Specifically, the operation main body 510 is configured to move to the door-opening side while compressing the biasing member 512 by bringing the flange part 510a close to the insertion part 511 on the door-opening side.

Next, as shown in FIG. 6, we will explain how to prevent the landing door 42 from closing using the elevator 1 of the second embodiment and how to release the door closure.

As in the first embodiment, first, the worker unlocks the locking device 7 using the unlocking device 8. Note that the method for unlocking the locking device 7 is the same as in the first embodiment, so a description thereof will be omitted.

Then, the worker moves the landing door 42 to the door-opening side. Specifically, the door bodies 420, 420 are pushed toward the door-opening side to fully open the landing door 42. When the landing door 42 is fully open, the engaging body portion 501 (specifically, the tapered surface 501a) is not in contact with the protruding member 6. When the worker further moves the fully open landing door 42 toward the door-opening side, as shown in the upper part of FIG. 6, the engaging body portion 501 (specifically, the tapered surface 501a) comes into contact with the protruding member 6, which is the engaged portion, from the door-closing side.

Then, as shown in the middle part of FIG. 6, the worker further moves the landing door 42 toward the door-opening side, bringing the door-opening side folded-back portion 420c closer to the two-dot chain line A shown in FIG. 6. As a result, the tapered surface 501a that abuts against the protruding member 6 moves toward the door-opening side, and the engaging rotation portion 500 rotates so that the engaging main body portion 501 rides on the protruding member 6.

As shown in the lower part of FIG. 6, when the landing door 42 is brought close to the position indicated by the two-dot chain line A in FIG. 6, the engaging body 501 is positioned on the door-opening side relative to the protruding member 6. The engaging rotation part 500 rotates so that the engaging body 501 moves downward. Thus, the engaging shaft 500b abuts against the protruding member 6 from above, and the abutment surface 501b abuts against the protruding member 6 from the door-opening side. In other words, when the landing door 42 in the fully open state is moved toward the door-opening side, the engaging part 50 switches to an engaged state in which it engages with the protruding member 6, which is the engaged part, by moving and rotating toward the door-opening side. Therefore, the landing door 42 can be prevented from closing.

In addition, as the landing door 42 moves to the door-opening side, the switching operation unit 51 also moves to the door-opening side. Specifically, the switching operation unit 51 moves to the door-opening side without changing the positional relationship with the engagement unit 50 in the opening/closing direction X.

Next, a case where the blocking of the landing door 42 from closing is released will be described with reference to FIG. 7. To release the blocking of the landing door 42 from closing, first, the operation main body 510 is moved to the door opening side. Specifically, the operator puts his/her hand around the back side of the door panel 420a to grip the gripping portion, and moves the operation main body 510 to the door opening side. As a result, as shown in the upper part of FIG. 7, the flange portion 510a approaches the insertion portion 511 on the door opening side while compressing the biasing member 512. In addition, the movement of the operation main body 510 to the door opening side pushes the rotating main body 500a to the door opening side. Therefore, the engagement rotating portion 500 rotates so as to move the door opening side of the engagement main body 501 upward. As a result, the abutment between the engagement shaft portion 500b and the abutment surface 501b and the protruding member 6 is released. As a result, the engagement between the engaging portion 50 and the protruding member 6, which is the engaged portion, is released, and the engaging portion 50 enters a disengaged state.

Next, as shown in the middle of FIG. 7, the operator moves the landing door 42 to the door closing side while keeping the operation main body 510 moved to the door opening side. This allows the engagement part 50 to be moved further to the door closing side than the protruding member 6, which is the engaged part. Here, a force is applied to the landing door 42 by the door hanger 421b to move it to the door closing side. Therefore, the force applied by the operator to the landing door 42 to move it to the door closing side can be reduced.

Then, the operator closes the landing door 42 and releases his/her hand from the operation main body 510 (specifically, the grip). As a result, the urging force of the urging member 512 presses the flange 510a toward the door closing side and abuts against the insertion portion 511 on the door closing side. This causes the operation main body 510 to return to the state before it moved. Therefore, the urging force of the urging member 512 becomes a restoring force that restores the operation main body 510 to the state before it moved. In addition, when the operation main body 510 is restored to the state before it moved, the engagement rotation portion 500 rotates due to the weight of the engagement main body 501, and the engagement portion 50 also returns to the state before it rotated. In this way, the prevention of the landing door 42 from closing is released.

As described above, according to the second embodiment, by moving the landing door 42, which is in a fully open state, further toward the door-opening side, the engaging portion 50 is switched to an engaged state by moving toward the door-opening side and rotating relative to the protruding member 6, which is the engaged portion. Therefore, it is easy to perform the operation for switching the engaging portion 50 to the engaged state.

In addition, in this embodiment, the abutment surface 501b abuts against the protruding member 6 from the door-opening side. A force moving the landing door 42 in the door-closing side is applied to the landing door 42 by the door hanger 421b. Therefore, by utilizing the force moving in the door-closing side, the abutment between the abutment surface 501b and the protruding member 6 can be further strengthened, and the landing door 42 can be prevented from closing.

In addition, in this embodiment, the engaging and rotating part 500 rotates by moving the operation main body part 510 to the door-opening side. This releases the engagement between the engaging part 50 and the protruding member 6, which is the engaged part, and the engaging part 50 goes into a non-engaged state. Therefore, it is easy to release the engagement between the engaging part and the engaged part simply by moving the operation main body part 510 to the door-opening side.

In addition, in this embodiment, the switching operation unit 51 has a biasing member 512. The biasing force of the biasing member 512 presses the flange portion 510a toward the door-closing side and abuts against the insertion portion 511 on the door-closing side. This eliminates the need for the operator to return the operation main body unit 510 to its original state.

In addition, in this embodiment, when the operation main body 510 returns to the state before it was moved, the engagement rotation part 500 rotates due to the weight of the engagement main body 501, and the engagement part 50 also returns to the state before it rotated. This saves the operator the trouble of returning the engagement part 50 to its original state.

In addition, in this embodiment, the gripping portion is disposed between the second portion 420e of the door-closing folding portion 420b and the guide member 513 on the door-closing side. This makes it easy for the operator to grip the gripping portion and to operate it.

Next, the unique configuration of the elevator 1 according to the third embodiment will be described. In the third embodiment shown in Figures 8 and 9, the configuration of the engagement portion 50 and the switching operation portion 51 differs from that of the second embodiment. Therefore, in the third embodiment, the differences from the second embodiment will be mainly described.

First, the engaged portion in the third embodiment is a protruding member 6 configured in the same manner as in the second embodiment. Therefore, the protruding member 6 is positioned on the door opening side of the landing door 42 in the fully open state.

The engagement part 50 of the third embodiment has an engagement rotation part 500 having a rotation main body part 500a and an engagement shaft part 500b, and an engagement main body part 501, as in the second embodiment. As shown in FIG. 8, the lower end of the rotation main body part 500a of the third embodiment is fixed in a state in which it can rotate relative to the door panel 420a. In addition, the engagement shaft part 500b extends from the lower end of the rotation main body part 500a through the cutout 420g toward the door opening side beyond the landing door 42.

As shown in FIG. 8, similar to the second embodiment, the engagement body 501 is provided at the end of the engagement shaft 500b on the door-opening side. The engagement body 501 also has a tapered surface 501a that slopes upward toward the door-opening side, and an abutment surface 501b that extends in the lifting direction Z.

The switch operation unit 51 in the third embodiment is a string-like member (specifically, a wire) whose door-opening side is attached to the rotation main body 500a and whose door-closing side is hooked on a hook portion 42x (specifically, an L-shaped protruding member) provided on the door panel. As shown in FIG. 9, in the third embodiment, the engagement portion 50 is configured to rotate by pulling the switch operation unit 51 toward the door-closing side. Also, the end of the switch operation unit 51 on the door-closing side is positioned closer to the door-opening side than the door-closing side fold-back portion 420b.

Next, a method for releasing the prevention of the landing door 42 from closing by the elevator 1 of the third embodiment will be described with reference to FIG. 9. The method for preventing the landing door 42 from closing by the elevator 1 of the third embodiment is the same as that of the second embodiment, and therefore the description of the second embodiment will also be used and will not be repeated here. As shown in the upper part of FIG. 9, in a state in which the landing door 42 is prevented from closing, the engaging shaft portion 500b abuts against the engaged portion, which is the protruding member 6, from above, and the abutting surface 501b abuts from the door opening side, as in the second embodiment.

To release the blocking of the landing door 42 from closing, the worker first operates the switching operation unit 51. Specifically, the worker pulls the string-like member that is the switching operation unit 51 toward the door closing side. This pulls the rotating main body 500a toward the door closing side, and the engaging rotating unit 500 rotates so that the engaging main body 501 moves upward. This releases the abutment between the engaging shaft 500b and the abutment surface 501b and the protruding member 6. Therefore, the engagement between the engaging unit 50 and the engaged protruding member 6 is released, and the engaging unit 50 goes into a non-engaged state.

Then, the operator can release the prevention of the landing door 42 from closing by moving the landing door 42 to the door closing side while pulling the switching operation part 51, which is a string-like member, to the door closing side. Note that when the tension on the switching operation part 51, which is a string-like member, is released, the engagement part 50 returns to its original state due to its own weight.

As described above, according to the third embodiment, the switching operation unit 51 is configured with a string-like member. Therefore, the engagement unit 50 can be switched from an engaged state to a disengaged state with a simple configuration.

In addition, according to this embodiment, the end of the switching operation unit 51 on the door closing side is positioned closer to the door opening side than the door closing side fold-back portion 420b. This makes it easier for the worker to operate the switching operation unit 51.

In addition, according to this embodiment, when the switching operation unit 51, which is a string-like member, is pulled toward the door closing side, the engaging and rotating unit 500 rotates and the engaging unit 50 goes into a disengaged state. This makes it easy to release the blocking of the landing door 42 from closing.

The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the invention.

In the above embodiment, the landing door 42 is a center-opening door. However, this is not limited to this, and the landing door 42 may be a single-opening door.

In the first embodiment described above, for example, the contact portion 510c may be shaped to be easily gripped by an operator. Also, the contact portion 510c may be provided with a handle for the operator to grip.

In addition, in the first embodiment, the case where the operator grips the contact portion 510c to perform the operation has been described, but this is not limited thereto, and the operator may operate the pulley 510a or the cord-like body 510b.

In the first embodiment described above, the switching operation unit 51 puts the engaging unit 50 in a disengaged state when the abutting portion 510c abuts against the abutted portion 511 from above. However, this is not limited to the above, and the switching operation unit 51 may put the engaging unit 50 in a disengaged state when the abutting portion 510c is arranged above the abutted portion 511 and is able to abut against the abutted portion 511. The same applies to the case where the engaging unit 50 is put in an engaged state, and it is sufficient that the abutting portion 510c is arranged below the abutted portion 511.

In the above first embodiment, the abutment portion 511 is made of an elastically deformable material, and the abutment portion 510c is made of a harder material than the abutment portion 511. However, this is not limited to the above, and the abutment portion 510c may be made of an elastically deformable material, and the abutment portion 511 may be made of a harder material than the abutment portion 510c. In this case, the abutment portion 510c moves in the lifting direction Z while deforming by abutting against the abutment portion 511.

In the second embodiment, the biasing member 512 is a compression spring. However, this is not limiting, and the biasing member 512 may be, for example, a leaf spring or a spiral spring. In other words, the biasing member 512 may be configured to bias the flange portion 510a in the door-opening direction.

In the second embodiment, the switching operation unit 51 is disposed between the door-closing fold-back portion 420b and the door-open fold-back portion 420c in the opening/closing direction X. However, this is not limited thereto, and for example, the end of the operation main body 510 on the door-closing side may constitute the first portion 420d of the door-closing side fold-back portion 420b. That is, a notch penetrating in the opening/closing direction X is provided in the first portion 420d of the door-closing side fold-back portion 420b, and a plate-shaped member that covers the notch is provided at the end of the operation main body 510 on the door-closing side. Then, the operator operates the switching operation unit 51 by pushing the plate-shaped member provided on the operation main body 510 to the door-open side. This eliminates the need for the operator to reach the back side of the door panel 420a, improving the operability of the switching operation unit 51.

In the second and third embodiments, the engaging body 501 has a tapered surface 501a. However, this is not limited to the above. For example, instead of the engaging body 501 having a tapered surface 501a, the protruding member 6, which is the engaged part, may have a tapered surface that slopes upward as it advances toward the door opening side.

In the second and third embodiments, the landing door 42 is moved toward the door-opening side from the fully open state, so that the engaging portion 50 engages with the engaged portion. However, if the landing door 42 and the car door 31 open and close in conjunction with each other, and the landing door 42 and the car door 31 are configured to have the same door-opening side position in the fully open state, the engaging portion 50 may be configured to engage with the engaged portion on the door-opening side from the most open position (fully open position) of the car door 31. As a result, for example, even if an elevator user pushes the car door 31 toward the door-opening side to set it to the fully open position, the landing door 42 is not moved toward the door-opening side from the fully open state by the car door 31, and the engaging portion 50 and the engaged portion do not engage with each other, so that it is possible to prevent the engaging portion 50 from switching to the engaged state by mistake.

In the second embodiment described above, the door closing prevention device 5 and the protruding member 6, which is the engaged part, are disposed approximately in the center of the lifting direction Z of the landing door 42. However, this is not limited thereto, and for example, the engaged part may be the protruding member 6 fixed to the landing side threshold 41. In other words, the engaged part may be disposed at the lower end of the landing side entrance 40, and may be disposed on the door opening side of the landing door 42 in the fully open state. In this case, the door closing prevention device 5 is provided below the landing door 42.

1: elevator, 2: hoistway, 3: car, 30: car body, 31: car door, 3a: car side entrance/exit, 3b: door drive mechanism, 4: elevator landing, 40: landing side entrance/exit, 41: landing side threshold, 410: guide groove, 42: landing door, 420: door body, 420a: door panel, 420b: door closing side fold-back portion, 420c: door opening side fold-back portion, 420d: first part, 420e: second part, 420f: lower end fold-back portion, 420g: cutout, 421: door drive portion, 421a : Door rail, 421b: Door hanger, 5: Door closing prevention device, 50: Engagement part, 500: Engagement rotation part, 500a: Rotation main body part, 500b: Engagement shaft part, 501: Engagement main body part, 501a: Tapered surface, 501b: Contact surface, 51: Switching operation part, 510: Operation main body part, 510a: Pulley, flange part, 510b: Belt, 510c: Contact part, 511: Insertion part, 512: Pressing member, 513: Guide member, 6: Protruding member, A: Two-dot chain line, X: Opening/closing direction, Y: Entering/exiting direction, Z: Lifting/lowering direction

Claims (5)

The elevator has a door closing prevention device provided on the hoistway side of a landing door that opens and closes between the landing and the hoistway by sliding,
The door closing prevention device includes an engaging portion that can be engaged by moving relative to an engaged portion provided around the landing door, and that maintains the landing door in a door open state by engaging with the engaged portion, and a switching operation portion that is operated by an operator,
The switching operation unit is provided on a back surface of a door panel of the landing door, and switches the engaging portion, which is in an engaged state in which it engages with at least the engaged portion, to a non-engaged state in which it does not engage with the engaged portion, by operation by the worker. The switching operation unit includes a contact portion provided on the landing door and a contact portion that is operated by the worker to move in a direction along the landing door and is prevented from moving by contacting the contact portion,
the switching operation unit switches the engagement unit to the engaged state in a state in which the abutment portion can abut against the abutted portion from one side in the direction of the movement,
The elevator according to claim 1 , wherein the switching operation unit switches the engaging portion to the disengaged state in a state in which the abutting portion is capable of abutting against the abutted portion from the other side in the direction of the movement. The engaged portion is disposed on the door opening side relative to the landing door in a fully open state,
The elevator according to claim 1 , wherein when the landing door in the fully open state is moved toward the door-opening side, the engaging portion engages with the engaged portion. The elevator of claim 3, wherein the switching operation unit includes an operation main body configured to switch the engagement unit from the engaged state to the disengaged state by being moved by the operator, and a biasing member having a restoring force that restores the operation main body in the moved state to the state before the movement. The elevator has a door closing prevention device provided on the hoistway side of a landing door that opens and closes between the landing and the hoistway by sliding,
The door closing prevention device includes an engaging portion that can be engaged by moving relative to an engaged portion provided around the landing door, and that maintains the landing door in a door open state by engaging with the engaged portion, and a switching operation portion that is operated by an operator,
The engaged portion is disposed on the door opening side relative to the landing door in a fully open state,
When the landing door in the fully open state is moved to the door opening side, the engaging portion engages with the engaged portion,
The switching operation unit includes an operation main body configured to switch the engaging portion from an engaged state in which the engaging portion is engaged with the engaged portion to a disengaged state in which the engaging portion is not engaged with the engaged portion by being moved by an operation of the operator, and a biasing member having a restoring force that restores the operation main body in the moved state to a state before the movement,
The switching operation unit switches at least the engagement portion in the engaged state to the disengaged state by operation by the worker.