Door locks and elevators

Abstract

To provide a door locking device capable of properly detecting opening / closing operation of a landing door with a simple configuration and to provide an elevator.SOLUTION: A door locking device 20 comprises a claw part 22, a first switch, and a second switch. The claw part 22 engages releasably with an engagement part 23 provided at a platform. The first switch detects the engagement of the engagement part 23 with the claw part 22. The second switch detects the load in the door opening direction of a landing door 201 from a car landing on the platform.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a door locking device provided at an elevator landing door and to an elevator. [Background technology]

[0002] In general, a landing door provided at a landing of an elevator is provided with a door locking device that locks and unlocks the opening and closing operation to prevent passengers from falling into the elevator shaft. The door locking device is provided with a door switch that detects the opening of the landing door.

[0003] An example of a technology related to such a door locking device is described in Patent Document 1. Patent Document 1 describes a technology that includes a plurality of landing door opening detection units that are provided corresponding to each landing door provided at each elevator landing and detect the opening of each landing door, a car door opening detection unit that detects the start of opening of the car door, a floor landing detection unit, and a determination unit. In the technology described in Patent Document 1, when the determination unit determines that any of the landing doors has been opened based on the detection state of the landing door opening detection unit, if the opening of the car door has not started, the detection result of the landing door opening detection unit of the landing where the car has landed is valid. In addition, when the opening of the car door has started, the determination unit invalidates the detection result of the landing door opening detection unit of the landing where the car has landed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2013 / 046364 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technology described in Patent Document 1, when a long object such as a main rope comes into contact with a building structure due to wind or vibration, the car door open detection unit may be switched continuously. Therefore, even if the car does not stop in front of the platform, the car door open detection unit may erroneously detect that the car is operating the platform door.

[0006] Therefore, in the technology described in Patent Document 1, a floor-landing detection unit needs to be installed to detect when the elevator car is stopped at a boarding or alighting area, which makes the number of parts and elevator operation control very complicated.

[0007] In consideration of the above problems, an object of the present invention is to provide a door locking device and an elevator that can normally detect the opening and closing operation of a landing door with a simple configuration. [Means for solving the problem]

[0008] In order to solve the above problems and achieve the object, the door locking device is a door locking device that releasably locks a landing door installed at an elevator landing. The door locking device includes a claw portion, a first switch, and a second switch. The claw portion releasably engages with a locking portion provided at the landing. The first switch detects the engagement between the locking portion and the claw portion. The second switch detects a load in the door opening direction of the landing door caused by a car that has landed at the landing.

[0009] The elevator also includes a car that moves up and down in a hoistway, a hall door installed at a hall where the car stops, and a door locking device that locks the hall door so that it can be unlocked. As the door locking device, the door locking device described above is applied. Effect of the Invention

[0010] According to the door locking device and elevator having the above-described configuration, the opening and closing operation of the landing door can be detected normally with a simple configuration. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing an elevator according to a first embodiment. [Diagram 2] FIG. 1 is a schematic configuration diagram showing a door locking device according to a first embodiment. [Diagram 3] FIG. 1 is a top view showing a door locking device according to a first embodiment. [Figure 4] FIG. 1 is a side view showing a door locking device according to a first embodiment. [Diagram 5] FIG. 1 is a diagram showing a circuit configuration of a door locking device according to a first embodiment. [Figure 6] 5 is a flowchart showing a door-opening operation of a hall door in the elevator according to the first embodiment. [Figure 7] FIG. 2 is a diagram showing an example of the operation of the door locking device according to the first embodiment, illustrating a state immediately before unlocking. [Figure 8] 1 is a diagram showing a state immediately before unlocking of a circuit configuration in a door locking device according to a first embodiment; [Figure 9] FIG. 2 is a diagram showing an example of the operation of the door locking device according to the first embodiment, illustrating a state immediately after unlocking. [Figure 10] 1 is a diagram showing a state immediately after unlocking of a circuit configuration in a door locking device according to a first embodiment; [Figure 11] 5 is a flowchart showing an example of an operation up to stopping (emergency stop) of a hoisting machine in an elevator according to a first embodiment. [Figure 12] 5 is a flowchart showing an unauthorized door-opening detection operation of a landing door in an example of an operation up to stopping (emergency stop) of a hoisting machine in an elevator according to a first embodiment. [Figure 13] FIG. 11 is a schematic diagram showing an elevator according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a door locking device and an elevator according to an embodiment will be described with reference to Fig. 1 to Fig. 13. In addition, the same reference numerals are used to designate common members in each drawing.

[0013] 1. First embodiment 1-1. Elevator configuration examples First, the configuration of an elevator according to a first embodiment (hereinafter, referred to as "this example") will be described with reference to FIG. FIG. 1 is a schematic diagram showing the elevator of this example.

[0014] The elevator 1 shown in Fig. 1 is an elevator in which multiple cars 101A, 101B, and 101C move in a hoistway 100 formed in an architectural structure. The multiple cars 101A, 101B, and 101C are controlled so as to be able to stop at landings 202A, 202B, 202C, 202D, 202E, and 202F provided on each floor of the architectural structure.

[0015] The elevator 1 includes a plurality of cars 101A, 101B, and 101C for carrying people and baggage, a first hoist 112, a second hoist 113, a first lower pulley 114, a second lower pulley 115, a first main rope 117, and a second main rope 118. The elevator 1 also includes a control unit 120 that controls the operation of the entire elevator 1.

[0016] A pair of cars 101A and 101B among the multiple cars 101A, 101B, and 101C are connected to a first main rope 117 and a second main rope 118. The first main rope 117 and the second main rope 118 are connected at both ends to form an endless shape. The cars 101A and 101B are connected to the first main rope 117 and the second main rope 118 via a connecting mechanism (not shown).

[0017] The first main rope 117 is wound around and suspended by the first hoist 112 and the first lower pulley 114. The first hoist 112 is installed at the upper part of the hoistway 100, and the first lower pulley 114 is installed at the lower part of the hoistway 100.

[0018] Further, the second main rope 118 is wound around and tensioned by the second hoisting machine 113 and the second lower pulley 115. The second hoisting machine 113 is installed at the upper part of the hoistway 100, and the second lower pulley 115 is installed at the lower part of the hoistway 100.

[0019] The pair of cars 101A, 101B are disposed at symmetrical positions so as to function as a counterweight for each other in a state in which they are connected to the first main rope 117 and the second main rope 118. Then, the pair of cars 101A, 101B circulate in the elevator shaft 100 when the first hoisting machine 112 and the second hoisting machine 113 are driven.

[0020] Among the multiple elevator cars 101A, 101B, and 101C, the elevator car 101C is paired with an elevator car (not shown). The elevator car 101C is connected to two main ropes (not shown). The two main ropes connected to the elevator car 101C are wound around two hoists and two lower pulleys (not shown). The hoists (not shown) are arranged coaxially with the first hoist 112 or the second hoist 113, and the lower pulleys (not shown) are arranged coaxially with the first lower pulley 114 or the second lower pulley 115. The elevator car 101C is driven by the hoists (not shown) to circulate in the elevator shaft 100.

[0021] In addition, the first hoist 112, the second hoist 113, and the hoist that circulates the car 101C are connected to the control unit 120. The control unit 120 controls the driving of the hoist that circulates the first hoist 112, the second hoist 113, and the car 101C.

[0022] Furthermore, at floors where the elevators 101A, 101B, and 101C stop in the building structure, landings 202A, 202B, 202C, 202D, 202E, and 202F are provided where people and luggage get on and off. Landing doors 201A, 201B, 201C, 201D, 201E, and 201F are provided at the landings 202A, 202B, 202C, 202D, 202E, and 202F. Hereinafter, they are simply referred to as landing 202 and landing door 201. The landing door 201 is installed so as to be openable and closable so as to block an entrance provided at the landing 202. The landing door 201 is always subjected to a closure load using a weight or the like in a direction to block the entrance, i.e., in a door closing direction.

[0023] When the cars 101A, 101B, 101C stop at the landing 202, the landing door 201 faces the car side door 11 provided on the cars 101A, 101B, 101C. The landing door 201 is provided with a door locking device 20 (see FIG. 2) described later that locks the landing door 201 so that it can be unlocked. The landing door 201 engages with a door opening engagement element 41 and a door closing engagement element 42 (see FIG. 2) described later that are provided on the car side door 11, and opens and closes in conjunction with the car side door 11.

[0024] The multiple cars 101A, 101B, and 101C and the door locking device 20 are connected to the control unit 120 by wire or wirelessly. The control unit 120 receives signals from the multiple cars 101A, 101B, and 101C and the door locking device 20, and controls the driving of the multiple cars 101A, 101B, and 101C and the hoists 112 and 113.

[0025] In this example, an elevator 1 has been described as an elevator in which multiple cars 101A, 101B, 101C move in a circular manner in one direction, but the present invention is not limited to this. For example, the present invention can also be applied to an elevator in which multiple cars are configured to be able to move in both upward and downward directions in the hoistway 100. Furthermore, the number of cars provided in the elevator 1 is not limited to four, and the number of cars may be four or less, or six or more.

[0026] 1-2. Door locking device configuration example Next, a configuration example of the door locking device 20 will be described with reference to FIGS. Fig. 2 is a schematic diagram showing the door locking device 20. Fig. 3 is a top view showing the door locking device 20, and Fig. 4 is a side view showing the door locking device 20. Note that Figs. 2 to 4 also show the configurations of the multiple cars 101A, 101B, and 101C.

[0027] First, the configuration of the passenger cars 101A, 101B, and 101C will be described. Hereinafter, it will be simply referred to as the passenger car 101. The car side door 11 is movably supported by a door rail (not shown) and is driven by a door motor (not shown). As shown in Figs. 2 to 4, the car side door 11 is provided with a door opening engagement element 41 and a door closing engagement element 42. The door opening engagement element 41 and the door closing engagement element 42 are each formed of a flat plate-shaped member extending a predetermined length along the vertical direction. Tapered portions are formed at both ends in the vertical direction of the door opening engagement element 41 and the door closing engagement element 42.

[0028] The door-opening engaging element 41 is fixed to the car-side door 11 with its longitudinal direction parallel to the up-down direction. The door-closing engaging element 42 is disposed facing the door-opening engaging element 41 with a gap therebetween in the opening / closing direction of the car-side door 11. The door-closing engaging element 42 is supported movably along the opening / closing direction of the car-side door 11 via a first link member 51 and a second link member 52. The first link member 51 and the second link member 52 are provided on the car-side door 11.

[0029] An operating link 47 is connected to the door closing engaging element 42 via a connection pin 47a. The operating link 47 is rotatably connected to the door closing engaging element 42 by the connection pin 47a. In addition, an operating arm 45 is connected to the end of the operating link 47 opposite to the end where the connection pin 47a is provided.

[0030] The operating arm 45 is connected to an operating link 47 via a connecting pin 46. The operating arm 45 is formed of a substantially L-shaped member. A bent portion of the operating arm 45 is supported by an operating shaft 44 provided on the car side door 11. Therefore, the operating arm 45 is rotatably supported by the car side door 11 via the operating shaft 44.

[0031] An operation roller 43 is rotatably attached via a roller shaft 43a to the end of the operation arm 45 opposite to the end to which the operation link 47 is connected. The operation roller 43 is disposed between an upper operation rail 48 and a lower operation rail 49 fixed to the car 101. The operation roller 43 moves along the upper operation rail 48 and the lower operation rail 49 in association with the opening and closing movement of the car side door 11.

[0032] The upper operation rail 48 and the lower operation rail 49 are disposed facing each other with a predetermined gap therebetween in the vertical direction. The upper operation rail 48 and the lower operation rail 49 each have a release operation section 48a, 49a, a transition section 48b, 49b, and a grip operation section 48c, 49c. The transition section 48b, 49b is located between the release operation section 48a, 49a and the grip operation section 48c, 49c.

[0033] When the car side door 11 is closed, the operating roller 43 is located in the release operation sections 48a, 49a of the upper operation rail 48 and the lower operation rail 49. When the car side door 11 performs the door-opening operation, the operating roller 43 moves from the release operation sections 48a, 49a of the upper operation rail 48 and the lower operation rail 49 to the transition sections 48b, 49b. Then, when the car side door 11 opens, the operating roller 43 moves from the transition sections 48b, 49b of the upper operation rail 48 and the lower operation rail 49 to the grip operation sections 48c, 49c. With this movement of the operating roller 43, the operating arm 45 rotates about the operating shaft 44.

[0034] The configuration of the car 101 is not limited to the one described above, and various other configurations may be applied.

[0035] Next, the door locking device 20 will be described. The door locking device 20 has a hook member 21, a locking portion 23, a lever 25, a rotating shaft 26, a door-opening roller 27, a door-closing roller 28, and a stopper 33. The hook member 21 is rotatably attached to a base portion 211 provided on the landing door 201 via the rotating shaft 26. The hook member 21 is formed in a substantially flat plate shape, and a claw portion 22 is formed on the hook member 21.

[0036] The claw portion 22 protrudes in the door closing direction beyond the rotation shaft 26 of the hook member 21, and its tip portion faces downward in the vertical direction. The claw portion 22 is releasably engaged with the locking portion 23. When the landing door 201 is a single-leaf door, the locking portion 23 is fixed to a three-sided jamb provided at the landing 202. When the landing door 201 is a double-leaf door, the locking portion 23 is fixed to the opposite landing door (not shown).

[0037] When the claw portion 22 and the locking portion 23 are locked, the door opening operation of the landing door 201 is locked, that is, the door locking device 20 is in a locked state. The center of gravity of the hook member 21 is located closer to the claw portion 22 than the position where the rotation shaft 26 is provided. Therefore, in a state where no opening or closing operation is performed, the hook member 21 rotates in the door closing direction (counterclockwise in the example shown in FIG. 2), and the claw portion 22 and the locking portion 23 are locked. This makes it possible to prevent the hook member 21 from rotating unintentionally due to wind, vibration, etc., and to maintain the locked state of the claw portion 22 and the locking portion 23, that is, the locked state of the door locking device 20. Note that a biasing member that biases the hook member 21 in the direction in which the claw portion 22 engages with the locking portion 23 may be provided.

[0038] Further, electrodes and contacts constituting a first switch 61 (see FIG. 5) are provided on the claw portion 22 and the locking portion 23. When the claw portion 22 and the locking portion 23 are locked, the first switch 61 is conductive.

[0039] Further, a groove 21a is formed in the hook member 21. The groove 21a is formed in an arc shape centered on the rotation shaft 26. A rotation shaft 27a of a door-opening roller 27, which will be described later, is inserted into this groove 21a. Furthermore, the hook member 21 is provided with a first contact 32a and a second contact 32b that constitute a second switch 62 (see FIG. 5). The first contact 32a and the second contact 32b are disposed on the downstream side when a lever 25, which will be described later, rotates in the door-opening direction.

[0040] A lever 25 is rotatably attached to a rotating shaft 26 that rotatably supports the hook member 21. A door-opening roller 27 is provided on the end of the lever 25 opposite to the end supported by the rotating shaft 26. The door-opening roller 27 is rotatably supported on the end of the lever 25 via a rotating shaft 27a. The rotating shaft 27a of the door-opening roller 27 is inserted into a groove 21a formed in the hook member 21. The groove 21a guides the movement of the lever 25 via the rotating shaft 27a. The movable range of the lever 25 is limited to the range of the opening of the groove 21a.

[0041] In addition, the door-opening roller 27 is disposed at the tip of the lever 25. Therefore, when no opening or closing operation is being performed, the lever 25 rotates in the door-closing direction (counterclockwise in the example shown in FIG. 2), and the rotation shaft 27a of the door-opening roller 27 abuts against the lower end of the groove 21a in the up-down direction.

[0042] In this embodiment, the rotating shaft 27a of the door-opening roller 27 is inserted into the groove 21a, but the present invention is not limited to this. For example, a guide protrusion protruding from the lever 25 toward the groove 21a may be provided, and the guide protrusion may slide within the groove 21a to guide the movement of the lever 25 and limit the range of movement.

[0043] Furthermore, the lever 25 is provided with an electrode 31 constituting a second switch 62. The electrode 31 is disposed on a side surface portion on the upper side in the vertical direction of the lever 25. The electrode 31 faces the first contact 32a and the second contact 32b with a gap therebetween. When the lever 25 is at the upper end portion in the vertical direction of the groove 21a, that is, when the lever 25 rotates in the door opening direction (clockwise in the example shown in FIG. 2), the electrode 31 comes into contact with the first contact 32a and the second contact 32b. When the electrode 31 comes into contact with the first contact 32a and the second contact 32b, the second switch 62 becomes conductive.

[0044] The door-closing roller 28 and the stopper 33 are attached to a base portion 211 of the landing door 201. The stopper 33 faces the hook member 21 with a gap therebetween, and comes into contact with the hook member 21 when the hook member 21 rotates in the door-opening direction (clockwise in the example shown in FIG. 2). This causes the stopper 33 to restrict the movement of the hook member 21 in the door-opening direction (clockwise in the example shown in FIG. 2).

[0045] The door closing roller 28 is rotatably attached to the base portion 211. When the car 101 stops at the boarding / alighting area 202, the door opening roller 27 and the door closing roller 28 are disposed between the door opening engaging element 41 and the door closing engaging element 42. The door opening roller 27 faces the door opening engaging element 41 with a gap therebetween, and the door closing roller 28 faces the door closing engaging element 42 with a gap therebetween. By providing a gap between the door opening roller 27 and the door opening engaging element 41, and between the door closing roller 28 and the door closing engaging element 42, it is possible to prevent collision between them when the car 101 rises or falls.

[0046] Next, the circuit configuration of the door locking device 20 having the above-mentioned configuration will be described with reference to FIG. FIG. 5 is an explanatory diagram showing the circuit configuration of the door locking device 20. As shown in FIG.

[0047] 5, the door locking device 20 has a first switch 61, a second switch 62, a first connection terminal 63, and a second connection terminal 64. The first connection terminal 63 and the second connection terminal 64 are connected in series to the door locking device 20 provided on the other landing door 201. In addition, the first connection terminal 63 and the second connection terminal 64 are connected to the control unit 120.

[0048] The first switch 61 is composed of an electrode and a contact provided on the claw portion 22 and the locking portion 23. The second switch 62 is composed of an electrode 31 provided on the lever 25, and a first contact 32a and a second contact 32b provided on the hook member 21. The first switch 61 and the second switch 62 are connected in parallel to a first connection terminal 63 and a second connection terminal 64.

[0049] When the landing door 201 is closed and before the opening / closing operation is performed, the first switch 61 is conductive and the second switch 62 is cut off.

[0050] 2, the first contact 32a and the second contact 32b of the second switch 62 connected to the first connection terminal 63 and the second connection terminal 64 are provided on the hook member 21. The electrode 31 that comes into contact with and separates from the first contact 32a and the second contact 32b is provided on the rotating lever 25. In other words, by not providing the first contact 32a and the second contact 32b, which require wiring, on the rotating lever 25, it is possible to prevent the wiring connected to the first contact 32a and the second contact 32b from being damaged by the rotational movement of the lever 25.

[0051] In this embodiment, the second switch 62 is configured with the first contact 32a and the second contact 32b, and the electrode 31 that connects the first contact 32a and the second contact 32b, but the present invention is not limited to this. The second switch 62 may be configured with the first contact 32a and the second contact 32b, with the first contact 32a connected to the first connection terminal 63 provided on the lever 25 and the second contact 32b connected to the second connection terminal 64 provided on the hook member 21.

[0052] 1-3. Opening operation of landing doors Next, the door-opening operation of the landing door 201 having the above-mentioned door locking device 20 will be described with reference to FIGS. Fig. 6 is a flowchart showing the door-opening operation of the landing door 201, Fig. 7 is a diagram showing the state immediately before the door locking device 20 is unlocked, and Fig. 8 is a diagram showing the state immediately before the circuit configuration of the door locking device 20 is unlocked. Also, Fig. 9 is a diagram showing the state immediately after the door locking device 20 is unlocked, and Fig. 10 is a diagram showing the state immediately after the circuit configuration of the door locking device 20 is unlocked.

[0053] As shown in Fig. 6, when the car 101 arrives at an arbitrary landing 202, the control unit 120 stops driving the first hoist 112 and the second hoist 113 (step S11). As a result, the car side door 11 of the car 101 faces the landing door 201 of the landing 202. In addition, as shown in Fig. 2, the door-opening roller 27 and the door-closing roller 28 of the door locking device 20 are disposed between the door-opening engaging element 41 and the door-closing engaging element 42 provided on the car side door 11.

[0054] Next, the control unit 120 starts the operation of the door motor of the car 101 that performs the door-opening operation. This starts the movement of the car-side door 11 in the door-opening direction (step S12). As the car-side door 11 moves in the door-opening direction, the door-opening engaging element 41 and the door-closing engaging element 42 provided on the car-side door 11 also start moving in the door-opening direction together with the car-side door 11 (step S13).

[0055] As the door-opening engaging member 41 moves in the door-opening direction, the door-opening engaging member 41 comes into contact with the door-opening roller 27 (step S14), as shown in Fig. 7. When the car-side door 11 further moves in the door-opening direction, the door-opening roller 27 is pressed by the door-opening engaging member 41, and the lever 25 to which the door-opening roller 27 is connected rotates in the door-opening direction around the rotating shaft 26 (step S15).

[0056] As shown in Fig. 7, when the lever 25 rotates to the upper end of the groove 21a, the electrode 31 provided on the lever 25 comes into contact with the first contact 32a and the second contact 32b. This brings the first contact 32a and the second contact 32b into conduction, as shown in Fig. 8, and the second switch 62 becomes conductive (step 16). That is, the second switch 62 can detect the load in the door opening direction by the door opening engaging member 41. At this time, the claw portion 22 and the locking portion 23 are locked as shown in Fig. 7, and therefore the first switch 61 is conductive as shown in Fig. 8.

[0057] 7, in the process of step S16, the operation roller 43 connected to the door closing engagement member 42 via the operation arm 45 and the operation link 47 moves from the release operation section 48a, 49a to the transition section 48b, 49b along the upper operation rail 48 and the lower operation rail 49. This causes the operation arm 45 on which the operation roller 43 is provided to rotate about the operation shaft 44. In this example, the operation arm 45 rotates counterclockwise. As a result, the door closing engagement member 42 moves supported by the first link member 51 and the second link member 52, the gap between the door closing engagement member 42 and the door opening engagement member 41 narrows, and the door closing engagement member 42 and the door closing roller 28 come into contact with each other.

[0058] Furthermore, when the car-side door 11 moves further in the door-opening direction, the hook member 21 is pressed in the door-opening direction by the rotating shaft 27a of the door-opening roller 27 provided on the lever 25 through the groove 21a. Therefore, as shown in FIG. 9, the hook member 21 rotates in the door-opening direction about the rotating shaft 26, and the claw portion 22 provided on the hook member 21 rotates. Then, the claw portion 22 moves away from the locking portion 23, and the locking between the claw portion 22 and the locking portion 23 is released. As a result, as shown in FIG. 10, the first switch 61 is cut off (step S17). At this time, the electrode 31 is in contact with the first contact 32a and the second contact 32b, so that the second switch 62 is conductive.

[0059] When the car side door 11 further moves in the door-opening direction, the hook member 21 comes into contact with the stopper 33 provided on the base portion 211 (step S18). As a result, the landing door 201 is pressed in the door-opening direction by the hook member 21 via the stopper 33. As a result, the landing door 201 starts to move in the door-opening direction together with the car side door 11, that is, starts an opening operation (step S19).

[0060] 9, the operation roller 43 moves from the transition sections 48b, 49b to the grip operation sections 48c, 49c along the upper operation rail 48 and the lower operation rail 49. As a result, the operation arm 45 on which the operation roller 43 is provided rotates the most around the operation shaft 44. As a result, the door closing engaging element 42 moves in a direction approaching the door opening engaging element 41, and the gap between the door closing engaging element 42 and the door opening engaging element 41 becomes the narrowest. Then, the door opening roller 27 and the door closing roller 28 are held in a state of being gripped by the door opening engaging element 41 and the door closing engaging element 42. This completes the door opening operation of the landing door 201.

[0061] In addition, the door closing operation of the landing door 201 is performed in a reverse process of the door opening operation process described above, and therefore the description thereof will be omitted.

[0062] As described above, in the door locking device 20 of this example, the second switch 62 is conductive only when the door motor of the car 101 receives a load that tries to open the landing door 201. That is, when the building structure is shaken by wind or an earthquake, or when a long object such as the main rope 117 abuts against the lever 25 or the door opening roller 27, the second switch 62 is temporarily conductive. However, when the long object is swung back and separated from the lever 25 or the door opening roller 27, the continuity of the second switch 62 is interrupted.

[0063] Furthermore, since the door-opening operation load by the door motor generated after the car 101 has landed on the floor can be detected by the second switch 62, the landing of the car 101 can be determined by the door locking device 20 without using a sensor for determining the landing of the car 101 on the floor. As a result, the opening and closing operation of the hall door 201 can be normally detected with a simple configuration. Also, the allowable landing error of the car 101, that is, the difference in height between the floor of the car 101 and the floor surface of the hall 202, can be adjusted according to the length in the up-down direction of the door-opening engaging member 41 and the door-closing engaging member 42, that is, the length in the ascending and descending direction of the car 101.

[0064] Here, when the landing door 201 performs a door-closing operation, a foreign object such as a pebble may be caught in the landing door 201, or a passenger may collide with the landing door 201, and a load exceeding the closer load may act in the door-opening direction of the landing door 201. As described above, after the landing door 201 performs the door-opening operation, the door-opening roller 27 and the door-closing roller 28 are held in a state of being gripped by the door-opening engaging element 41 and the door-closing engaging element 42. Therefore, even if a load is applied in the door-opening direction during the door-closing operation of the landing door 201, it is possible to prevent the lever 25 on which the door-opening roller 27 is provided from rotating in the door-closing direction (counterclockwise). As a result, it is possible to ensure the continuity of the second switch 62, and it is possible to prevent the control unit 120 from erroneously detecting that an abnormality has occurred and erroneously stopping the hoists 112 and 113.

[0065] 1-4. Example of hoisting machine stopping (emergency stop) operation Next, an example of the operation of stopping (emergency stop) the hoists 112, 113 in the elevator 1 having the above-mentioned configuration will be described with reference to Figs. FIG. 11 is a flowchart showing an example of the operation of stopping the hoists 112 and 113, and FIG. 12 is a flowchart showing the operation of detecting the unauthorized opening of the landing door.

[0066] In the elevator 1, for safety reasons, if the elevator car 101 has not yet landed on the floor and the hall door 201 is opened, the hoists 112 and 113 are stopped (emergency stop). 11, the control unit 120 judges whether or not unauthorized door opening has been detected at the first landing door 201A provided at the first landing 202A (step S31). In the process of step S31, when it is judged that unauthorized door opening has not been detected at the first landing door 201A (No judgment at step S31), the control unit 120 judges whether or not unauthorized door opening has been detected at the second landing door 201B provided at the second landing 202B (step S32).

[0067] Furthermore, in the process of step S32, when it is determined that the unauthorized door opening has not been detected at the second landing door 201B (No determination at step S32), the control unit 120 sequentially determines whether or not the unauthorized door opening has been detected at the landing doors 201 provided at all landings (step S33). Then, when the control unit 120 determines that the unauthorized door opening has not been detected at the landing doors 201 at all landings, the process ends.

[0068] On the other hand, when it is determined that unauthorized door opening has been detected at the landing door 201 (Yes determination in step S31, step S32, and step S33), the control unit 120 stops all the hoists 112 and 113 (emergency stop).

[0069] Next, an unauthorized door-opening detection operation of the landing door 201 will be described with reference to FIG. 11, the control unit 120 determines whether the first switch 61 is conductive (step S41). If it is determined in the process of step S41 that the first switch 61 is cut off, the control unit 120 determines whether the second switch 62 is conductive (step S42).

[0070] In the process of step S41 or step S42, when it is determined that at least one of the first switch 61 and the second switch 62 is conductive, the control unit 120 determines that the state of the landing door 201 is normal (undetected unauthorized door opening) (step S43). In addition, in the process of step S42, when it is determined that the second switch 62 is cut off, the control unit 120 determines that unauthorized door opening is being performed at the landing door 201 (step S44). This completes the unauthorized door opening detection operation at the landing door 201.

[0071] In this way, in the elevator 1 of this example, when it is determined that both the first switch 61 and the second switch 62 are cut off, it is determined that unauthorized door opening has been performed at the landing door 201. Then, as shown in Fig. 10, when unauthorized door opening is detected at any of the multiple landing doors 201, all of the hoists 112, 113 are stopped. This makes it possible to prevent the elevator car 101 from ascending or descending when the landing door 201 is in an unauthorized open state, thereby improving safety.

[0072] 2. Second embodiment Next, an elevator according to a second embodiment will be described with reference to FIG. Fig. 13 is a schematic diagram showing the configuration of an elevator according to the second embodiment. Note that parts common to the elevator 1 according to the first embodiment are given the same reference numerals and overlapping explanations are omitted.

[0073] In the elevator 1 according to the first embodiment described above, an elevator in which a plurality of cars 101A, 101B, and 101C move in a circular manner in one direction has been described, but the present invention is not limited to this. For example, an elevator in which two cars 101E and 101F move up and down in one elevator shaft 100B may be applied, as in an elevator 1B according to a second embodiment shown in FIG. 13.

[0074] As shown in Fig. 13, the elevator 1B has two cars 101E and 101F, two hoists 131 and 132, two main ropes 137 and 138, and a control unit 120B. The first car 101E is connected to the first main rope 137. The first main rope 137 is wound around the first hoist 131. When the first hoist 131 is driven, the first car 101E moves up and down in the elevator shaft 100B.

[0075] In addition, the second car 101F is connected to a second main rope 138. The second main rope 138 is wound around a second hoisting machine 132. When the second hoisting machine 132 is driven, the second car 101F moves up and down in the elevator shaft 100B.

[0076] The control unit 120B is connected to the first hoist 131 and the second hoist 132, and controls the driving of the first hoist 131 and the second hoist 132. Furthermore, the control unit 120B is connected to the door locking devices 20 provided on the two cars 101E and 101F and the hall doors 201A, 201B, and 201C of the halls 202A, 202B, and 202C. The control unit 120B receives signals from the cars 101E and 101F and the door locking devices 20, and controls the driving of the cars 101E and 101F and the hoists 131 and 132.

[0077] Other configurations are the same as those of the elevator 1 according to the first embodiment, and therefore description thereof will be omitted. The elevator 1B according to the second embodiment having such an auxiliary holding unit can also obtain the same effects as those of the elevator 1B according to the first embodiment described above.

[0078] The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention described in the claims.

[0079] In the above-mentioned embodiment, the elevator is a multi-car elevator in which multiple cars move up and down in one elevator shaft, but the present invention is not limited to this. For example, the present invention can be applied to an elevator in which one car moves up and down in one elevator shaft.

[0080] In particular, in elevators where the car moves up and down a long distance, the elongation of the main rope changes as passengers and baggage get on and off, and the height of the car, i.e., the stopping position, changes. In such elevators, the hoist is driven according to the elongation of the main rope while passengers and baggage get on and off, and the height of the car is adjusted. By using the above-mentioned door locking device 20 for elevators that perform such control, the hoist can be stopped reliably during elevator maintenance and inspection, allowing maintenance and inspection work to be performed safely.

[0081] In the above-mentioned embodiment, the second switch 62 is provided on the lever 25 and the hook member 21, but the present invention is not limited to this. The second switch 62 may be located at any position in the door locking device 20 where the door-opening operation load applied by the car door motor can be detected. For example, one of the electrodes or contacts constituting the second switch 62 may be provided on the rotating shaft 27a of the door-opening roller 27, and an electrode or contact that makes contact with and separates from the electrode or contact may be provided at the downstream end of the groove 21a of the hook member 21 in the door-opening direction.

[0082] The second switch 62 is preferably provided at a position where the second switch 62 is not conductive when the car 101 lands on the floor. That is, when the car 101 lands on the floor, a gap is provided between the contacts or electrodes constituting the second switch 62, and the second switch 62 is cut off. Then, it is preferable that the contacts or electrodes come into contact with each other and the second switch 62 is conductive after the door motor of the car 101 is driven and the door opening engagement member 41 moves. This makes it possible to prevent the contacts or electrodes constituting the second switch 62 from colliding with each other and damaging the second switch 62 when the car 101 lands on the floor.

[0083] Furthermore, in the above-mentioned embodiment, an example in which a contact-type switch consisting of a contact point and an electrode is applied as the first switch 61 and the second switch 62 has been described, but the present invention is not limited to this. For example, an optical switch consisting of a light-emitting unit and a light-receiving unit, a proximity sensor that switches the output of a built-in semiconductor, or other various switches may be applied as the first switch 61 and the second switch 62. Note that by applying an optical switch or a proximity sensor as the first switch 61 and the second switch 62, failures due to welding or wear between the contact point and the electrode are eliminated, and countermeasure structures and maintenance work are not required.

[0084] In this specification, the words "parallel" and "orthogonal" are used, but these do not mean only "parallel" and "orthogonal" in the strict sense, but may also mean a "substantially parallel" or "substantially orthogonal" state that includes "parallel" and "orthogonal" and is within a range in which the respective functions can be exerted. [Explanation of symbols]

[0085] 1, 1B... elevator, 11... car door, 20... door locking device, 21... hook member, 21a... groove, 22... claw portion, 23... latching portion, 25... lever, 26... rotating shaft, 27... door opening roller, 27a... rotating shaft, 28... door closing roller, 31... electrode, 32a... first contact, 32b... second contact, 33... stopper, 41... door opening engagement element, 42... door closing engagement element, 43... operation roller, 44... operation shaft, 45... operation arm, 46... connecting pin, 47... operation link, 47a... connection pin, 48... upper operation rail, 49... lower operation rail, 51... first link member, 52... second link member, 61... first switch, 62... second switch, 63... first connection terminal, 64...second connection terminal; 100, 100B...hoistway; 101, 101A, 101B, 101C, 101D, 101E, 101F...car; 112, 113, 131, 132...hoisting machine; 117, 118, 137, 138...main rope; 120, 120B...control unit; 201, 201A, 201B, 201C, 201D, 201E, 201F...landing door; 202, 202A, 202B, 202C, 202D, 202E, 202F...landing; 211...base unit

Claims

1. A door locking device that releasably locks a landing door installed at an elevator landing, A claw portion that releasably engages with a locking portion provided at the boarding and alighting area; a first switch that detects engagement between the engagement portion and the claw portion; a second switch that detects a load in a door opening direction of the landing door caused by a car that has landed at the landing; A hook member that is rotatably supported on the landing door via a rotation shaft and has the claw portion; a door opening roller that comes into contact with a door opening engaging element provided on a car side door of the passenger car; a lever that supports the door-opening roller and is rotatably supported on the rotation shaft; Equipped with The second switch is An electrode provided on the lever; a contact provided on the hook member; When the lever rotates in the door-opening direction, the electrode comes into contact with the contact, and the second switch becomes conductive. The first switch and the second switch are connected in parallel. Door locking device.

2. The hook member is formed with a groove for guiding the movement of the lever.

2. The door locking device according to claim 1.

3. When the landing door is opened, the lever is pressed by the door opening engaging member via the door opening roller and rotates before the hook member.

3. A door locking device according to claim 2.

4. A car that moves up and down the elevator. A landing door installed at a landing where the elevator car stops; A door locking device that locks the landing door in an unlockable manner, The door locking device is A claw portion that releasably engages with a locking portion provided at the boarding and alighting area; a first switch that detects engagement between the engagement portion and the claw portion; a second switch that detects a load in a door opening direction of the landing door caused by the elevator car that has landed at the landing; A hook member that is rotatably supported on the landing door via a rotation shaft and has the claw portion; a door opening roller that comes into contact with a door opening engaging element provided on a car side door of the passenger car; a lever that supports the door-opening roller and is rotatably supported on the rotation shaft; Equipped with The second switch is An electrode provided on the lever; a contact provided on the hook member; When the lever rotates in the door-opening direction, the electrode comes into contact with the contact, and the second switch becomes conductive. The first switch and the second switch are connected in parallel. Elevator.

5. A hoist that moves the car up and down; A control unit that controls the drive of the hoisting machine, The control unit inhibits driving of the hoist when both the first switch and the second switch are cut off.

5. The elevator according to claim 4.

6. A plurality of the cars move up and down within the elevator.

5. The elevator according to claim 4.

Images