Elevator car door device

Abstract

In this elevator car door device, an opening / closing interlocking mechanism has an expansion / contraction connection body that can expand and contract between a normal state and an expanded state, which is a state in which the expansion / contraction connection body is expanded from the normal state. The expansion / contraction connection body maintains the normal state during normal opening / closing operation of the car door. In addition, when the car door is manually moved in the opening direction from the landing via the landing door, the expansion / contraction connection body changes to the expanded state by receiving a tensile force equal to or greater than a set tensile force.

Description

Elevator car door device

[0001] The present disclosure relates to an elevator car door device.

[0002] In a conventional elevator car door lock device, when the car is at the landing position, the car door moves toward the jamb side, causing the landing side blade to hit the interlock roller and displace to the unlocked position. At the same time, the balance weight displaces to the side opposite to the landing side blade (see, for example, Patent Document 1).

[0003] Japanese Patent No. 5940220

[0004] In the conventional elevator car door lock device as described above, when attempting to forcibly move the car door from the landing in the opening direction, the direction of the force pushing the landing side blade is opposite to the rotation direction of the lever mechanism during normal opening operation. Therefore, especially when the landing side blade is configured to operate suddenly, it becomes impossible to forcibly move the car door from the landing in the opening direction, and it cannot be pried open.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain an elevator car door device capable of reducing the force required to forcibly move the car door from the landing in the opening direction.

[0006] The elevator car door device according to the present disclosure includes a car door provided in the car, a car side coupling mechanism provided in the car door that sandwiches a landing side coupling member provided in the landing door when the car door is opened, thereby coupling the landing door to the car door, and an opening / closing interlocking mechanism that interlocks the car side coupling mechanism with the operation of the car door. The opening / closing interlocking mechanism has a telescopic coupling body that can expand and contract between a normal state and an extended state extended from the normal state. The telescopic coupling body maintains the normal state during normal opening and closing operations of the car door, and changes to the extended state when receiving a tensile force equal to or greater than a set tensile force when manually moving the car door in the opening direction from the landing through the landing door.

[0007] The elevator car door device of this disclosure makes it possible to reduce the force required to forcibly move the car door in the opening direction from the landing.

[0008] This is a schematic diagram showing an elevator according to Embodiment 1. This is a front view of the main part of the landing door device in Figure 1, as seen from the hoistway side. This is a front view of the main part of the car door device in Figure 1, as seen from the landing side. This is an enlarged front view of the telescopic connector in Figure 3. This is a front view of the telescopic connector in Figure 4, showing it in the extended state. This is a front view of the first car door in Figure 3, showing it in the state where it has started to move in the opening direction. This is a front view of the first car door in Figure 6, showing it in the state where it has moved further in the opening direction. This is a front view of the first car door in Figure 7, showing it in the state where it has moved further in the opening direction. This is a rear view of the interlock latch, fixed-side interlock roller, and movable-side interlock roller in Figure 2, as seen from the landing side. This is a front view showing the state where the first car door in Figure 6 is being moved in the opening direction when the car is stopped at a position away from the landing. This is a front view showing the state where the movable-side interlock roller in Figure 3 has been moved to the unlocked side by operation from the landing. This is a front view showing the first car door in Figure 11, showing it in the open direction. This is a front view showing the first car door of Figure 12 in the open position. This is a front view showing the main parts of the elevator car door device according to Embodiment 2. This is a front view showing the first car door of Figure 14 in the open position. This is a front view showing the first car door in the open position. This is a front view showing the movable side interlock roller of Figure 14 moved to the unlocked position by operation from the landing. This is a front view showing the first car door of Figure 16 in the open position. This is a front view showing the main parts of the elevator car door device according to Embodiment 3. This is a front view showing the first car door of Figure 18 in the open position. This is a front view showing the main parts of the elevator car door device according to Embodiment 4.

[0009] The embodiments will be described below with reference to the drawings. Embodiment 1. Figure 1 is a schematic diagram showing an elevator according to Embodiment 1. In the figure, a machine room 2 is provided above the hoistway 1. The machine room 2 is equipped with a hoisting machine 3, a deflector 4, and an elevator control device 5.

[0010] The hoisting machine 3 includes a drive sheave 6, a hoisting machine motor (not shown), and a hoisting machine brake (not shown). The hoisting machine motor rotates the drive sheave 6. The hoisting machine brake maintains the drive sheave 6 in a stationary state. The hoisting machine brake also brakes the rotation of the drive sheave 6.

[0011] A suspension system 7 is wrapped around the drive sheave 6 and the deflector wheel 4. Multiple ropes or multiple belts are used as the suspension system 7. A cage 8 is connected to the first end of the suspension system 7. A counterweight 9 is connected to the second end of the suspension system 7.

[0012] The elevator car 8 and counterweight 9 are suspended by the suspension body 7 and move up and down within the hoistway 1 by rotating the drive sheave 6. The elevator control device 5 controls the operation of the elevator car 8 by controlling the hoisting machine 3.

[0013] Within the elevator shaft 1, there is a pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown). The pair of car guide rails guide the movement of the car 8. The pair of counterweight guide rails guide the movement of the counterweight 9.

[0014] The elevator car 8 comprises a car frame 10, a car compartment 11, and a car door device 12. A suspension system 7 is connected to the car frame 10. The car compartment 11 is supported by the car frame 10. A door controller 13 is provided on the elevator car 8. The door controller 13 controls the car door device 12.

[0015] Each of the landings on multiple floors is equipped with a landing door device 14. Each landing door device 14 opens and closes in conjunction with the car door device 12 when the car 8 lands on the floor.

[0016] Figure 2 is a front view of the main parts of the landing door device 14 shown in Figure 1, as seen from the elevator shaft 1 side. Each landing door device 14 includes a landing door girder 15, a first landing door 16, a second landing door 17, a landing door interlocking mechanism 18, an interlock device 19, and a door closer (not shown).

[0017] Each of the landings on multiple floors is provided with a landing entrance 14a. A landing door beam 15 is fixed to the top of the landing entrance 14a. A landing door rail 15a is provided on the landing door beam 15. The landing door rail 15a is arranged parallel to the width direction of the landing entrance 14a and horizontally. The width direction of the landing entrance 14a is parallel to the opening and closing direction of the first landing door 16 and the second landing door 17, and is the left-right direction in Figure 2.

[0018] The first landing door 16 and the second landing door 17 are suspended from the landing door rail 15a. Furthermore, when the landing entrance / exit 14a is opened and closed, the first landing door 16 and the second landing door 17 are guided by the landing door rail 15a and move in opposite directions.

[0019] Each of the first landing door 16 and the second landing door 17 has a landing door body 20 and a landing door hanger 21. Each landing door body 20 opens and closes the landing entrance 14a.

[0020] The landing door hanger 21 is fixed to the upper part of the landing door body 20. The landing door hanger 21 is also hung on the landing door rail 15a.

[0021] The landing door interlocking mechanism 18 includes a first landing pulley 22, a second landing pulley 23, an endless interlocking rope 24, a first landing door connecting fitting 25, and a second landing door connecting fitting 26.

[0022] The first landing pulley 22 and the second landing pulley 23 are installed on the landing door girder 15, spaced apart from each other in the width direction of the landing entrance 14a. The interlocking rope 24 is wound around the first landing pulley 22 and the second landing pulley 23.

[0023] The first landing door 16 is connected to the lower part of the interlocking rope 24 via the first landing door connecting fitting 25. The second landing door 17 is connected to the upper part of the interlocking rope 24 via the second landing door connecting fitting 26.

[0024] When the interlocking rope 24 circulates due to the opening and closing operation of the first landing door 16, the second landing door 17 moves in the opposite direction to the first landing door 16. In other words, the landing door interlocking mechanism 18 links the opening and closing operation of the first landing door 16 to the operation of the second landing door 17.

[0025] The interlock device 19 is installed between the landing door girder 15 and the first landing door 16. The interlock device 19 also prevents the landing entrance 14a from being opened from the landing side when the elevator car 8 is not in contact with the floor.

[0026] Furthermore, the interlock device 19 includes a latch 27, an interlock latch 28, a fixed-side interlock roller 29, and a movable-side interlock roller 30. The fixed-side interlock roller 29 and the movable-side interlock roller 30 are landing-side connecting members, respectively.

[0027] The latch 27 is fixed to the landing door girder 15. The interlock latch 28 is rotatably mounted on the landing door hanger 21 of the first landing door 16. When the first landing door 16 and the second landing door 17 are in the fully closed position, the tip of the interlock latch 28 catches on the latch 27, thereby restricting the movement of the first landing door 16 and the second landing door 17 in the opening direction.

[0028] The fixed interlock roller 29 is positioned coaxially with the rotation axis of the interlock latch 28. The movable interlock roller 30 is attached to the interlock latch 28. As a result, the movable interlock roller 30 can move along an arc centered on the rotation axis of the interlock latch 28.

[0029] The door closer constantly applies a closing force, i.e., a self-closing force, to the first landing door 16 and the second landing door 17. The door closer generates the self-closing force of the first landing door 16 and the second landing door 17 by, for example, utilizing gravity acting on the closer weight.

[0030] Figure 3 is a front view of the main part of the car door device 12 shown in Figure 1, as seen from the landing side. The car door device 12 includes a car door beam 31, a first car door 32, a second car door 33, a car door drive mechanism 34, a car door locking mechanism 35, a car-side coupling mechanism 36, and an opening / closing interlocking mechanism 37.

[0031] The elevator car 11 is provided with an elevator car entrance / exit 11a. The elevator car door beam 31 is attached to the elevator car 8 above the elevator car entrance / exit 11a. The elevator car door rail 31a is provided on the elevator car door beam 31. The elevator car door rail 31a is parallel to the width direction of the elevator car entrance / exit 11a and is horizontal. The width direction of the elevator car entrance / exit 11a is parallel to the opening and closing direction of the first elevator car door 32 and the second elevator car door 33, and is the left-right direction in Figure 3.

[0032] The first car door 32 and the second car door 33 are suspended from the car door rail 31a. When the car entrance 11a is opened and closed, the first car door 32 and the second car door 33 are guided by the car door rail 31a and move in opposite directions.

[0033] Each of the first car door 32 and the second car door 33 has a car door body 38 and a car door hanger 39. Each car door body 38 opens and closes the car entrance 11a.

[0034] The cage door hanger 39 is fixed to the upper part of the cage door body 38. The cage door hanger 39 is also hung on the cage door rail 31a.

[0035] The car door drive mechanism 34 is provided on the car door beam 31. The car door drive mechanism 34 also includes a door motor 41, a first car pulley 42, a second car pulley 43, an endless drive belt 44, a first car door connecting fitting 45, and a second car door connecting fitting 46.

[0036] The door motor 41 is fixed to the car door beam 31. The first car pulley 42 and the second car pulley 43 are provided on the car door beam 31 at a distance from each other in the width direction of the car entrance 11a. The first car pulley 42 rotates when the driving force from the door motor 41 is transmitted to it.

[0037] The drive belt 44 is wound around the first cage pulley 42 and the second cage pulley 43. The rotation of the first cage pulley 42 is transmitted to the second cage pulley 43 by the drive belt 44.

[0038] The first car door 32 is connected to the lower part of the drive belt 44 via the first car door connecting fitting 45. The second car door 33 is connected to the upper part of the drive belt 44 via the second car door connecting fitting 46.

[0039] When the first cage pulley 42 rotates, the drive belt 44 circulates, causing the first cage door 32 and the second cage door 33 to move in opposite directions.

[0040] The car door locking mechanism 35 is installed between the first car door 32 and the car door beam 31. The car door locking mechanism 35 also restricts the movement of the first car door 32 in the opening direction when the car 8 stops at a position away from the landing. The car door locking mechanism 35 also includes a fixed locking element 51, a movable locking element 52, a connecting rod 53, a lock detection switch 54, and a short-circuiting member 55.

[0041] The fixed locking element 51 is fixed to the car door beam 31. The movable locking element 52 is attached to the first car door 32. The movable locking element 52 is also rotatable relative to the first car door 32 between the locked position shown in Figure 3 and the unlocked position shown in Figure 8. When the first car door 32 moves in the opening direction while the movable locking element 52 is in the locked position, the movable locking element 52 catches on the fixed locking element 51, restricting the opening movement of the first car door 32.

[0042] The upper end of the connecting rod 53 is rotatably connected to the movable lock 52. The lower end of the connecting rod 53 is connected to the cage-side connecting mechanism 36.

[0043] The lock detection switch 54 is fixed to the car door beam 31 above the fixed locking element 51. The short-circuiting member 55 is fixed to the upper part of the movable locking element 52.

[0044] When the first car door 32 is in the fully closed position and the movable locking piece 52 is in the locked position, the short - circuit member 55 is inserted into the locking detection switch 54. Thereby, the two contacts in the locking detection switch 54 are short - circuited via the short - circuit member 55.

[0045] The short - circuit member 55 is disposed above the rotation center of the movable locking piece 52. And when the movable locking piece 52 rotates while the first car door 32 remains in the fully closed state, the direction in which the short - circuit member 55 is inserted into and removed from the locking detection switch 54 forms an acute angle with respect to the opening and closing operation direction of the first car door 32.

[0046] The car - side connecting mechanism 36 is provided on the first car door 32. Also, when the first car door 32 is opened, the car - side connecting mechanism 36 connects the first landing door 16 to the first car door 32 by sandwiching the fixed - side interlock roller 29 and the movable - side interlock roller 30.

[0047] When the car 8 lands at the landing, when the first car door 32 starts to open, the movable - side interlock roller 30 and the fixed - side interlock roller 29 are sandwiched by the car - side connecting mechanism 36. Thereby, the first car door 32 is connected to the first landing door 16 and the interlock device 19 is unlocked.

[0048] The car - side connecting mechanism 36 has a support plate 61, a door - hitting - side blade 62, a first upper link 63, a first lower link 64, a door - pocket - side stopper 65, a door - hitting - side stopper 66, a door - pocket - side blade 67, a second upper link 68, and a second lower link 69.

[0049] The support plate 61 is fixed to the first car door 32. The door - hitting - side blade 62 is attached to the support plate 61 via the first upper link 63 and the first lower link 64. The first upper link 63 and the first lower link 64 constitute a parallel link mechanism. Thereby, the door - hitting - side blade 62 is displaceable with respect to the first car door 32 in the opening and closing operation direction of the first car door 32.

[0050] The door pocket side stopper 65 and the door stopper side stopper 66 are fixed to the support plate 61. The door pocket side stopper 65 restricts the displacement of the door stopper side blade 62 relative to the first car door 32 in the opening direction of the first car door 32. The door stopper side stopper 66 restricts the displacement of the door stopper side blade 62 relative to the first car door 32 in the closing direction of the first car door 32.

[0051] The door stopper blade 62 is displaceable relative to the first car door 32 within the range between the door pocket side stopper 65 and the door stopper side stopper 66. Furthermore, when the first car door 32 is in the fully closed position, the door stopper blade 62 is pressed against the door pocket side stopper 65 by gravity or the spring force of a blade spring (not shown).

[0052] The lower end of the door stopper blade 62 is rotatably connected to the first end of the first lower link 64. The lower end of the connecting rod 53 is rotatably connected to the second end of the first lower link 64. The second end of the first lower link 64 is the end opposite to the first end with respect to the rotation center of the first lower link 64.

[0053] When the door stopper blade 62 is in contact with the door pocket stopper 65, the movable locking element 52 is in the locked position. When the door stopper blade 62 is displaced away from the door pocket stopper 65, the first lower link 64 rotates clockwise in Figure 3, and the movable locking element 52 rotates toward the unlocked position.

[0054] The pocket-side blade 67 is provided on the pocket side of the first car door 32 relative to the door stop-side blade 62. The pocket-side blade 67 is attached to the support plate 61 via the second upper link 68 and the second lower link 69.

[0055] The second upper link 68 and the second lower link 69 constitute a parallel link mechanism. As a result, the pocket-side blade 67 can be displaced relative to the first car door 32 in the opening and closing direction of the first car door 32. When the pocket-side blade 67 is displaced toward the door stop side of the first car door 32, the pocket-side blade 67 sandwiches the fixed-side interlock roller 29 and the movable-side interlock roller 30 between itself and the door stop-side blade 62.

[0056] The opening / closing interlocking mechanism 37 interlocks the opening and closing operation of the first car door 32 with the car-side coupling mechanism 36. The opening / closing interlocking mechanism 37 also includes a first follower 70, a rotating cam 71, a fixed cam 72, a rotating member 73, a second follower 74, and an extendable coupling body 75.

[0057] The first follower 70 is attached to the pocket-side blade 67. The shape of the first follower 70 is roller-like.

[0058] The rotating cam 71 is rotatably mounted on the support plate 61. The rotating cam 71 is provided with a groove-shaped door-closing side guide portion 71a and a door-opening side guide portion 71b. The door-opening side guide portion 71b is connected to the door-closing side guide portion 71a.

[0059] As the door-closing side guide portion 71a moves away from the door-opening side guide portion 71b, that is, as it approaches the bottom of the groove, it moves closer to the rotation center of the rotating cam 71. Conversely, as the door-closing side guide portion 71a moves closer to the door-opening side guide portion 71b, it moves away from the rotation center of the rotating cam 71.

[0060] The door-opening guide portion 71b is an arc-shaped curved surface centered on the rotation center of the rotating cam 71. That is, the door-opening guide portion 71b is at a constant distance from the rotation center of the rotating cam 71.

[0061] As the rotating cam 71 rotates, the first follower 70 moves along either the door closing side guide portion 71a or the door opening side guide portion 71b. As a result, the pocket side blade 67 is displaced relative to the first car door 32 in the direction of opening and closing the first car door 32.

[0062] The fixed cam 72 is fixed to the car door beam 31. The fixed cam 72 is provided with a groove-shaped fixed-side guide portion 72a.

[0063] The rotating member 73 is rotatably mounted on the support plate 61 above the rotating cam 71.

[0064] The second follower 74 is attached to the rotating member 73. The shape of the second follower 74 is roller-shaped. When the first car door 32 is in the fully closed position, the second follower 74 is inserted into the fixed-side guide portion 72a and is in contact with the inner surface of the fixed-side guide portion 72a.

[0065] The upper end of the telescopic connector 75 is rotatably connected to the rotating member 73. The lower end of the telescopic connector 75 is rotatably connected to the rotating cam 71. In this way, the telescopic connector 75 connects the rotating cam 71 and the rotating member 73.

[0066] Figure 4 is an enlarged front view of the telescopic connector 75 shown in Figure 3. The telescopic connector 75 includes an upper rod 76, a lower rod 77, a guide member 78, and a return spring 79.

[0067] The guide member 78 has a flat spring seat 78a, a flat rod fixing portion 78b, and a flat connecting portion 78c. The spring seat 78a protrudes perpendicularly from the upper end of the connecting portion 78c. The rod fixing portion 78b protrudes perpendicularly from the lower end of the connecting portion 78c. The rod fixing portion 78b is also opposite the spring seat 78a.

[0068] The upper rod 76 has a rod body 76a, a rod stopper 76b, and a spring retainer 76c. The upper end of the rod body 76a is rotatably connected to the rotating member 73. The middle part of the rod body 76a passes through the spring seat 78a. The rod stopper 76b is fixed to the middle part of the rod body 76a on the opposite side from the spring seat 78a and from the spring retainer 76c.

[0069] The spring retainer 76c is provided at the lower end of the rod body 76a. The spring retainer 76c is located between the spring seat 78a and the rod fixing portion 78b. The spring retainer 76c is also facing the spring seat 78a.

[0070] The upper end of the lower rod 77 is fixed to the rod fixing part 78b. The lower end of the lower rod 77 is rotatably connected to the rotating cam 71.

[0071] The return spring 79 is provided between the spring seat 78a and the spring retainer 76c. In this example, a coil spring is used as the return spring 79. The upper rod 76 passes through the return spring 79.

[0072] With this configuration, the telescopic connector 75 can extend and retract between the normal state shown in Figure 4 and the extended state, which is a state extended from the normal state. Figure 5 is a front view showing the extended state of the telescopic connector 75 in Figure 4.

[0073] The telescopic connector 75 maintains its normal state during the normal opening and closing operation of the first car door 32. However, when the first car door 32 is manually moved in the opening direction from the landing via the first landing door 16, the telescopic connector 75 changes to an extended state when it receives a tensile force exceeding the set tensile force.

[0074] That is, when a tensile force opposing the return spring 79 is applied to the telescopic connector 75 from the normal state, as shown in Figure 5, the return spring 79 is compressed, the rod stopper 76b separates from the spring seat 78a, and the entire telescopic connector 75 is extended. At this time, the upper rod 76 is guided by the spring seat 78a and moves straight relative to the guide member 78 along the extension of the lower rod 77.

[0075] When the tensile force resisting the return spring 79 is released, the restoring force of the return spring 79 causes the upper rod 76 to move relative to the guide member 78 until the rod stopper 76b contacts the spring seat 78a. This returns the entire length of the telescopic connecting body 75 to its original length. In the normal state, the rod stopper 76b is pressed against the side of the spring seat 78a opposite to the return spring 79 by the spring force of the return spring 79.

[0076] The set tensile force is set to a value sufficiently larger than the force received during normal opening and closing operations of the first car door 32, so that it does not extend beyond its normal state during normal opening and closing operations. Furthermore, the set tensile force is set to a value sufficiently smaller than the upper limit of the force required to pry open the first car door 32 from the landing. The upper limit of the force required to pry open the first car door 32 from the landing is, for example, 300 N.

[0077] Next, the normal operation of the car door device 12 will be described. As shown in Figure 3, when the first car door 32 and the second car door 33 are in the fully closed position, the door stop side blade 62 and the door pocket side blade 67 are separated from the fixed side interlock roller 29 and the movable side interlock roller 30, respectively.

[0078] Furthermore, the door stopper blade 62 is in contact with the door pocket stopper 65. Also, the movable locking element 52 is in the locked position.

[0079] As the first cage door 32 begins to move in the opening direction from the state shown in Figure 3, the door stop side blade 62 first hits the movable side interlock roller 30, as shown in Figure 6. Also, the short-circuit member 55 is pulled out from the lock detection switch 54, and the lock detection switch 54 turns off.

[0080] Subsequently, as the first cage door 32 moves further in the opening direction, the movable interlock roller 30 is pushed by the door stop blade 62, as shown in Figure 7, and the interlock device 19 is unlocked. Also, the second follower 74 moves slightly along the fixed guide portion 72a of the fixed cam 72, and the rotating member 73 rotates clockwise in Figure 7.

[0081] The rotation of the rotating member 73 is transmitted to the rotating cam 71 via the telescopic connecting body 75. As a result, the rotating cam 71 rotates clockwise in Figure 7. Consequently, the first follower 70 moves relative to the rotating cam 71 in a direction toward the door opening side guide portion 71b along the door closing side guide portion 71a.

[0082] At this time, as the first follower 70 gradually moves away from the rotation center of the rotating cam 71, the pocket-side blade 67 gradually moves in a direction that approaches the door stop-side blade 62.

[0083] Subsequently, as the first cage door 32 moves further in the opening direction, the pocket-side blade 67 strikes the fixed-side interlock roller 29 and the movable-side interlock roller 30, as shown in Figure 8. As a result, the fixed-side interlock roller 29 and the movable-side interlock roller 30 are sandwiched between the door stopper-side blade 62 and the pocket-side blade 67. The door stopper-side blade 62 also strikes the door stopper-side stopper 66.

[0084] The movement of the door stop blade 62 is transmitted to the movable locking element 52 via the first lower link 64 and the connecting rod 53. This causes the movable locking element 52 to rotate to the unlocked position. This allows further movement of the first car door 32 in the opening direction.

[0085] At the moment when the first landing door 16 and the first car door 32 begin to move in the opening direction simultaneously, the car-side coupling mechanism 36 firmly grips the fixed-side interlock roller 29 and the movable-side interlock roller 30. This enables smooth opening and closing operation.

[0086] Furthermore, the straight line passing through the center of the first follower 70 and the point of contact between the first follower 70 and the door-opening guide portion 71b also passes through the rotation center of the rotating cam 71. For this reason, the pocket door blade 67 does not move in the opening direction even when subjected to an opening force from the first car door 32. Also, even if the rotating cam 71 rotates further due to the further rotation of the rotating member 73, the position of the pocket door blade 67 does not change. In addition, the telescopic connecting body 75 is not subjected to tensile force.

[0087] Therefore, while the first car door 32 is moving, the car-side coupling mechanism 36 securely grips the fixed-side interlock roller 29 and the movable-side interlock roller 30.

[0088] Here, the position of the first car door 32 shown in Figure 8 is the locking start position when the first car door 32 is closed. The locking start position is the position of the first car door 32 where the car door locking mechanism 35 starts the locking operation during the normal closing operation of the first car door 32, that is, the position of the first car door 32 where the movable locking element 52 starts rotating from the unlocked position to the locked position.

[0089] Figure 9 is a rear view of the interlock latch 28, fixed-side interlock roller 29, and movable-side interlock roller 30 shown in Figure 2, as seen from the landing side. When the interlock device 19 is locked, the fixed-side interlock roller 29 and the movable-side interlock roller 30 are positioned within a width W1 in the opening and closing direction of the first car door 32.

[0090] Furthermore, when the first cage door 32 reaches the locking start position during normal closing operation, the distance between the door stop side blade 62 and the door pocket side blade 67 is less than or equal to the width W1.

[0091] With this configuration, even if the first landing door 16 fails to close automatically just before reaching the fully closed position due to wind pressure or other reasons, the door motor 41's driving force allows the pocket-side blade 67 to move the first landing door 16 in the closing direction. This allows the movable-side interlock roller 30 to move the door-stop-side blade 62 to a position corresponding to the unlocked position of the movable lock element 52.

[0092] In contrast, when the first car door 32 reaches the locking start position during normal closing operation, if the distance between the door stop side blade 62 and the door pocket side blade 67 is not less than or equal to the width W1, the first car door 32 may self-lock and become unable to open.

[0093] In other words, if the first car door 32 moves to the fully closed position, but the first landing door 16 stops just before the fully closed position due to wind pressure or the like, the door closing detection switch of the interlock device 19 does not turn on, and the car 8 cannot move. As a result, the first car door 32 attempts to open again, but even if the first car door 32 moves to the locking start position, the door stop side blade 62 does not come into contact with the movable side interlock roller 32. As a result, the first car door 32 self-locks, and it becomes impossible to open it.

[0094] As a solution to this problem, in Embodiment 1, the door pocket side blade 67 is configured to close earlier. Therefore, even if the first landing door 16 stops just before the fully closed position, the fixed side interlock roller 29 and the movable side interlock roller 30 are pushed towards the door stop by the door pocket side blade 67 at the same time that the first car door 32 is in the locked position.

[0095] Therefore, according to the configuration of Embodiment 1, when the elevator car 8 is resting on the landing, the movable locking element 52 will never engage with the fixed locking element 51 and self-lock under any circumstances.

[0096] Next, we will explain the case where the elevator car 8 stops at a location away from the landing due to some abnormality. Figure 10 is a front view showing the state in which the elevator car 8 has stopped at a location away from the landing and an attempt is made to move the first elevator car door 32 in Figure 6 in the opening direction.

[0097] In this case, there is no fixed interlock roller 29 and a movable interlock roller 30 between the door stopper side blade 62 and the door pocket side blade 67. As a result, even when the first car door 32 begins to move in the opening direction, the door stopper side blade 62 remains in contact with the door pocket side stopper 65.

[0098] Therefore, the movable locking element 52 remains in the locked position and strikes the fixed locking element 51, preventing further movement of the first car door 32 in the opening direction.

[0099] Next, we will explain the case where the elevator car 8 is resting on the landing and the car entrance 11a is opened from the landing during elevator maintenance. Figure 11 is a front view showing the state in which the movable interlock roller 30 in Figure 3 has been moved to the unlocked side by operation from the landing.

[0100] After the maintenance worker unlocks the interlock device 19 by operating it from the landing, they move the first landing door 16 in the opening direction. As a result, the fixed interlock roller 29 and the movable interlock roller 30 move in the opening direction of the first car door 32 and strike the pocket side blade 67.

[0101] When the first landing door 16 is moved further in the opening direction, an opening force is applied to the door pocket side blade 67 of the first car door 32. Then, a force that rotates the rotating cam 71 counterclockwise in Figure 11 is applied to the rotating cam 71 from the door pocket side blade 67 via the first follower 70.

[0102] Furthermore, since the door pocket side blade 67 is attached to the first car door 32, the first car door 32 also receives an opening force.

[0103] However, in order to move the first cage door 32 in the opening direction, the rotating cam 71 needs to be rotated clockwise in Figure 11.

[0104] Therefore, if the door pocket side blade 67 is configured to move toward the door stop side in accordance with the opening movement of the first car door 32, a large reaction force is generated when an opening force is applied to the door pocket side blade 67. For this reason, in the conventional configuration, a very large force is required to move the first landing door 16 from the landing to move the first car door 32 toward the opening direction.

[0105] In contrast, in Embodiment 1, since the opening and closing interlocking mechanism 37 is provided with an extendable connector 75, the first car door 32 can be moved in the opening direction without requiring a large force.

[0106] Specifically, when the first car door 32 receives an opening force from the door pocket side blade 67, the first car door 32 moves in the opening direction, as shown in Figure 12, and the rotating member 73 rotates clockwise in Figure 12. As a result, the telescopic connecting body 75 is pulled up.

[0107] At this time, a force is acting on the rotating cam 71 to rotate it counterclockwise as shown in Figure 12, but since the rotating cam 71 cannot rotate counterclockwise, its position remains unchanged. As a result, a tensile force is applied to the telescopic connector 75, causing it to extend.

[0108] In this way, even if the door pocket side blade 67 does not move toward the door stop side, the rotating member 73 rotates clockwise in Figure 12, so that the first cage door 32 can be forcibly moved toward the opening direction.

[0109] After the first car door 32 has moved to a certain extent in the opening direction, if the force applied to the first landing door 16 is released, the force of the telescopic connecting body 75 to contract will cause the door pocket side blade 67 to move toward the door stop side.

[0110] Furthermore, the force exerted by the retractable connector 75 to contract also acts on the closing direction of the first car door 32, but the design allows for the movement of the pocket-side blade 67 due to the running resistance of the first car door 32. Alternatively, the first car door 32 can be held in place to prevent it from moving in the closing direction through operational measures.

[0111] Subsequently, as shown in Figure 13, once the first follower 70 has moved until it contacts the door-opening guide portion 71b of the rotating cam 71, no reaction force will be generated even if the first car door 32 is moved in the opening direction.

[0112] The movable locking element 52 can be manually rotated to the unlocked position through the gap between the first landing door 16 and the second landing door 17 that is created when the first landing door 16 is moved in the opening direction. In this case, an operating wire or the like (not shown) may be installed to facilitate access to the movable locking element 52 through the gap between the first landing door 16 and the second landing door 17.

[0113] In this type of elevator car door device 12, an extendable connector 75 is provided in the opening / closing interlocking mechanism 37. The extendable connector 75 maintains its normal state during the normal opening and closing operation of the first elevator car door 32. The extendable connector 75 changes to an extended state when it receives a tensile force exceeding the set tensile force when the first elevator car door 32 is manually moved in the opening direction from the landing via the first landing door 16.

[0114] Therefore, the force required to forcibly move the first car door 32 in the opening direction from the landing can be reduced.

[0115] Furthermore, by speeding up the movement of the pocket-side blade 67, the first car door 32 can immediately grip the fixed-side interlock roller 29 and the movable-side interlock roller 30 as soon as it starts moving in the opening direction, making the opening and closing operation smoother.

[0116] Furthermore, during normal elevator operation, the car-side coupling mechanism 36 can maintain a grip on the fixed-side interlock roller 29 and the movable-side interlock roller 30. As a result, the first car door 32 and the first landing door 16 open and close smoothly without unnecessary shaking or misalignment.

[0117] Furthermore, the telescopic connector 75 is connected between the rotating cam 71 and the rotating member 73. When the first cage door 32 is opened, the second follower 74 is guided by the fixed cam 72, causing the rotating member 73 to rotate, and the rotation of the rotating member 73 is transmitted to the rotating cam 71 via the telescopic connector 75. As a result, the rotating cam 71 rotates, and the first follower 70 is guided by the rotating cam 71, causing the door pocket side blade 67 to move toward the door stop side.

[0118] Furthermore, when the first car door 32 is manually moved in the opening direction from the landing via the first landing door 16, the second follower 74 is guided by the fixed cam 72, causing the rotating member 73 to rotate. On the other hand, the first follower 70 is pressed against the rotating cam 71, but the rotating cam 71 does not rotate, and the telescopic connecting body 75 is extended.

[0119] Therefore, with a simple configuration, the force required to forcibly move the first car door 32 from the landing in the opening direction is reduced, while the car entrance 11a and the landing entrance 14a can be fully opened.

[0120] Furthermore, the rotating cam 71 is provided with a door-closing side guide portion 71a and a door-opening side guide portion 71b. The door-closing side guide portion 71a moves away from the rotation center of the rotating cam 71 as it approaches the door-opening side guide portion 71b. The door-opening side guide portion 71b is an arc-shaped curved surface centered on the rotation center of the rotating cam 71.

[0121] When the first car door 32 is opened, the first follower 70 moves relative to the rotating cam 71 from the door closing side guide portion 71a to the door opening side guide portion 71b. Also, when the pocket side blade 67 receives a force in the direction of the pocket, the pocket side blade 67 does not move relative to the first car door 32 while the first follower 70 is in contact with the door opening side guide portion 71b.

[0122] This makes it possible to more reliably prevent the rotating cam 71 from rotating when moving the first car door 32 from the landing in the opening direction, thereby changing the telescopic connecting body 75 to an extended state and reducing the force required to forcibly move the first car door 32 in the opening direction.

[0123] Furthermore, the car door locking mechanism 35 is unlocked when the first car door 32 is opened, as the door stop side blade 62 contacts the fixed side interlock roller 29 and the movable side interlock roller 30, displacing the first car door 32 toward the door stop side.

[0124] Therefore, with a simple configuration, the car door device 12 can be given the function of locking the first car door 32.

[0125] Furthermore, when the first cage door 32 reaches the locking start position during normal closing operation, the distance between the door stop side blade 62 and the door pocket side blade 67 is less than or equal to the width W1.

[0126] Therefore, regardless of the position of the first landing door 16, that is, even if the first landing door 16 is not in the fully closed position, the car door locking mechanism 35 can be unlocked more reliably.

[0127] Furthermore, the telescopic connector 75 has the configuration shown in Figures 4 and 5. Therefore, a telescopic connector 75 that can expand and contract between a normal state and an extended state can be obtained with a simple configuration.

[0128] Embodiment 2. Next, Figure 14 is a front view showing the main parts of the elevator car door device 12 according to Embodiment 2. In Embodiment 2, the car door locking mechanism 35 in Embodiment 1 is omitted. Also, the door stop side blade 62 is fixed to the support plate 61.

[0129] Other configurations in Embodiment 2 are the same as those in Embodiment 1.

[0130] Next, the normal operation of the cage door device 12 will be described. As shown in Figure 14, when the first cage door 32 is in the fully closed position, the door stop side blade 62 and the door pocket side blade 67 are separated from the fixed side interlock roller 29 and the movable side interlock roller 30, respectively.

[0131] As the first cage door 32 begins to move in the opening direction from the state shown in Figure 14, the second follower 74 moves slightly along the fixed-side guide portion 72a of the fixed cam 72, and the rotating member 73 rotates clockwise in Figure 15, as shown in Figure 15.

[0132] The rotation of the rotating member 73 is transmitted to the rotating cam 71 via the telescopic connector 75. As a result, the rotating cam 71 rotates clockwise in Figure 15. Consequently, the first follower 70 moves relative to the rotating cam 71 in a direction toward the door opening side guide 71b along the door closing side guide 71a.

[0133] At this time, the first follower 70 gradually moves away from the rotation center of the rotating cam 71, causing the pocket-side blade 67 to gradually move towards the door-stop-side blade 62. Then, the fixed-side interlock roller 29 and the movable-side interlock roller 30 are sandwiched between the door-stop-side blade 62 and the pocket-side blade 67, and the interlock device 19 is unlocked.

[0134] At the moment when the first landing door 16 and the first car door 32 begin to move in the opening direction simultaneously, the car-side coupling mechanism 36 firmly grips the fixed-side interlock roller 29 and the movable-side interlock roller 30. This enables smooth opening and closing operation.

[0135] Next, we will explain the case where the elevator car 8 is resting on the landing and the car entrance 11a is opened from the landing during elevator maintenance. Figure 16 is a front view showing the state in which the movable interlock roller 30 in Figure 14 has been moved to the unlocked side by operation from the landing.

[0136] After the maintenance worker unlocks the interlock device 19 by operating it from the landing, they move the first landing door 16 in the opening direction. As a result, the fixed interlock roller 29 and the movable interlock roller 30 move in the opening direction of the first car door 32 and strike the pocket side blade 67.

[0137] When the first landing door 16 is moved further in the opening direction, an opening force is applied to the door pocket side blade 67 of the first car door 32. Then, a force that rotates the rotating cam 71 counterclockwise in Figure 16 is applied to the rotating cam 71 from the door pocket side blade 67 via the first follower 70.

[0138] Furthermore, since the door pocket side blade 67 is attached to the first car door 32, the first car door 32 also receives an opening force.

[0139] When the first car door 32 receives an opening force from the door pocket side blade 67, the first car door 32 moves in the opening direction, as shown in Figure 17, and the rotating member 73 rotates clockwise in Figure 17. As a result, the telescopic connecting body 75 is pulled up.

[0140] At this time, a force acts on the rotating cam 71 that rotates it counterclockwise as shown in Figure 17. As a result, a tensile force is applied to the telescopic connector 75, causing it to extend.

[0141] In this way, even if the door pocket side blade 67 does not move toward the door stop side, the rotating member 73 rotates clockwise in Figure 17, so that the first cage door 32 can be forcibly moved toward the opening direction.

[0142] After the first car door 32 has moved to a certain extent in the opening direction, if the force applied to the first landing door 16 is released, the force of the telescopic connecting body 75 to contract will cause the door pocket side blade 67 to move toward the door stop side.

[0143] Subsequently, as shown in Figure 15, once the first follower 70 has moved until it contacts the door-opening guide portion 71b of the rotating cam 71, no large reaction force will be generated even if the first car door 32 is moved in the opening direction.

[0144] Even with this configuration, similar to Embodiment 1, the force required to forcibly move the first car door 32 in the opening direction from the landing can be reduced.

[0145] Embodiment 3. Next, Figure 18 is a front view showing the main parts of the elevator car door device 12 according to Embodiment 3. Figure 19 is a front view showing the state in which the first car door 32 of Figure 18 has been moved in the opening direction.

[0146] The elevator car door device 12 of Embodiment 3 has the same configuration as Embodiment 1, plus a maintenance unlocking mechanism 81. When the elevator is being maintained and the car entrance 11a is opened from the landing, the maintenance unlocking mechanism 81 rotates the movable locking element 52 from the locked position to the unlocked position in conjunction with the extension movement of the telescopic connecting body 75.

[0147] The maintenance unlocking mechanism 81 includes an unlocking lever 82 and a control cable 83. The middle portion of the unlocking lever 82 is rotatably mounted on a support plate 61. The unlocking lever 82 is rotatable between a normal position and an operating position.

[0148] The normal position is, as shown in Figure 18, when the upper end of the unlocking lever 82 is away from the door stop side blade 62. The operating position is, as shown in Figure 19, when the upper end of the unlocking lever 82 pushes the door stop side blade 62, moving the door stop side blade 62 toward the door stop.

[0149] The control cable 83 includes a flexible hose 84 and an unlocking wire 85. One end of the flexible hose 84 is connected to a guide member 78 of the telescopic connector 75. The other end of the flexible hose 84 is connected to the lower part of the support plate 61.

[0150] The unlocking wire 85 is passed through the flexible hose 84. One end of the unlocking wire 85 is pulled out from one end of the flexible hose 84 and connected to the upper rod 76 of the telescopic connector 75. The other end of the unlocking wire 85 is pulled out from the other end of the flexible hose 84 and connected to the lower end of the unlocking lever 82.

[0151] When the telescopic connecting body 75 extends, the unlocking lever 82 rotates from its normal position to the operating position via the unlocking wire 85. This pushes the door-stop side blade 62 toward the door stop. The displacement of the door-stop side blade 62 is transmitted to the movable lock element 52 via the first lower link 64 and the connecting rod 53, causing the movable lock element 52 to rotate to the unlocked position.

[0152] Other configurations and operations in Embodiment 3 are the same as in Embodiment 1.

[0153] Even with this configuration, the same effects as in Embodiment 1 can be obtained.

[0154] Furthermore, the maintenance unlocking mechanism 81 unlocks the car door locking mechanism 35 in conjunction with the extension movement of the telescopic connecting body 75 when the first car door 32 is manually moved in the opening direction from the landing via the first landing door 16.

[0155] Therefore, in a car door device 12 equipped with a car door locking mechanism 35, the car door locking mechanism 35 can be easily unlocked when moving the first car door 32 in the opening direction from the landing.

[0156] Embodiment 4. Next, Figure 20 is a front view showing the main parts of the elevator car door device 12 according to Embodiment 4. The door stop side blade 62 of Embodiment 4 is fixed to the support plate 61. The second lower link 69 has a protruding portion 69a. The protruding portion 69a protrudes from the rotation center of the second lower link 69 toward the opposite side from the door pocket side blade 67.

[0157] Furthermore, in the opening and closing interlocking mechanism 37 of Embodiment 4, the first follower 70 and the rotating cam 71 are omitted. The lower end of the lower rod 77 in the telescopic connecting body 75 is rotatably connected to the protruding portion 69a of the second lower link 69.

[0158] Other configurations in Embodiment 4 are the same as those in Embodiment 2.

[0159] This configuration also reduces the force required to forcibly move the first car door 32 in the opening direction from the landing.

[0160] In embodiments 1 to 4, the car-side coupling mechanism 36 and the opening / closing interlocking mechanism 37 are attached to a common support plate 61. However, the car-side coupling mechanism 36 and the opening / closing interlocking mechanism 37 may be attached to separate support plates.

[0161] Furthermore, while embodiments 1 to 4 show a center-opening cage door device 12, the cage door device 12 may also be a single-opening type.

[0162] Furthermore, the number of cage doors and the number of landing doors may be one or three or more, respectively.

[0163] Furthermore, the configuration for unlocking and locking the movable locking element 52 by the operation of the door stop side blade 62 may also be a method other than that shown. As an example of a method other than that shown, a stop plate may be provided on the door stop side blade 62 and an unlocking part may be provided on the movable locking element 52, and when the door stop side blade 62 moves toward the door stop side, the stop plate may come into contact with the unlocking part.

[0164] Furthermore, the overall layout of the elevator is not limited to the layout shown in Figure 1. For example, the roping method could be a 2:1 roping method.

[0165] Furthermore, the elevator may be a machine-room-less elevator, a double-deck elevator, or a single-shaft multi-car elevator. In a single-shaft multi-car elevator, the upper car and the lower car located directly below the upper car each move independently up and down a common hoistway.

[0166] 12 Cage door device, 19 Interlock device, 29 Fixed side interlock roller (landing side connecting member), 30 Movable side interlock roller (landing side connecting member), 35 Cage door locking mechanism, 36 Cage side connecting mechanism, 37 Opening and closing interlocking mechanism, 62 Door stop side blade, 67 Door pocket side blade, 70 First follower, 71 Rotating cam, 71a Door closing side guide, 71b Door opening side guide, 72 Fixed cam, 73 Rotating member, 74 Second follower, 75 Telescopic connecting body, 76 Upper rod, 76a Rod body, 76b Rod stopper, 76c Spring receiver, 78 Guide member, 78a Spring seat, 79 Return spring, 81 Maintenance unlocking mechanism.

Claims

1. An elevator car door device comprising: a car door provided on the car; a car-side connecting mechanism provided on the car door, which connects the landing door to the car door by sandwiching a landing-side connecting member provided on the landing door when the car door is opened; and an opening / closing interlocking mechanism that interlocks the car-side connecting mechanism with the operation of the car door, wherein the opening / closing interlocking mechanism has an extendable connecting body that can extend and contract between a normal state and an extended state which is an extended state from the normal state, the extendable connecting body maintains the normal state during the normal opening and closing operation of the car door, and changes to the extended state when the car door is manually moved in the opening direction from the landing through the landing door and receives a tensile force greater than a set tensile force.

2. The car-side connecting mechanism has a door stop side blade and a door pocket side blade provided on the door pocket side of the car door relative to the door stop side blade, and which, when displaced in the opening and closing direction of the car door relative to the car door, sandwiches the landing side connecting member between itself and the door stop side blade; the opening and closing interlocking mechanism further has a first follower provided on the door pocket side blade, a rotating cam rotatably provided on the car door, a fixed cam provided on the car, a rotating member rotatably provided on the car door, and a second follower provided on the rotating member; the telescopic connecting body is connected between the rotating cam and the rotating member; The elevator car door device according to claim 1, wherein when the car door is opened, the second follower is guided by the fixed cam, causing the rotating member to rotate, the rotation of the rotating member is transmitted to the rotating cam via the telescopic connector, causing the rotating cam to rotate, the first follower is guided by the rotating cam, causing the pocket-side blade to move toward the door stop side of the car door, and when the car door is manually moved in the opening direction from the landing through the landing door, the second follower is guided by the fixed cam, causing the rotating member to rotate, the first follower is pressed against the rotating cam but the rotating cam does not rotate, and the telescopic connector is in the extended state.

3. The elevator car door device according to claim 2, wherein the rotating cam is provided with a door-closing side guide portion and a door-opening side guide portion connected to the door-closing side guide portion, the door-closing side guide portion moves away from the rotation center of the rotating cam as it approaches the door-opening side guide portion, the door-opening side guide portion is an arc-shaped curved surface centered on the rotation center of the rotating cam, and when the car door is opened, the first follower moves from the door-closing side guide portion to the door-opening side guide portion relative to the rotating cam, and when the door pocket side blade is subjected to a force in the direction of the door pocket, the door pocket side blade does not move relative to the car door while the first follower is in contact with the door-opening side guide portion.

4. An elevator car door device according to claim 2 or 3, further comprising a car door locking mechanism provided between the car and the car door, which restricts the movement of the car door in the opening direction when the car stops at a position away from the landing, wherein the door stop side blade is displaceable relative to the car door in the opening and closing direction of the car door, and the car door locking mechanism is unlocked when the door stop side blade strikes the landing side connecting member and is displaced toward the door stop side of the car door during the opening operation of the car door.

5. The elevator car door device according to claim 4, wherein the landing-side connecting member is a fixed-side interlock roller and a movable-side interlock roller of an interlock device, and when the interlock device is in a locked state, the fixed-side interlock roller and the movable-side interlock roller are arranged within a width W1 in the opening and closing direction of the car door, and when the car door reaches the position where the car door locking mechanism starts to lock during the normal closing operation of the car door, the distance between the door stop-side blade and the door pocket-side blade is less than or equal to the width W1.

6. The elevator car door device according to claim 4 or claim 5, further comprising a maintenance unlocking mechanism that unlocks the car door locking mechanism in conjunction with the extension movement of the telescopic connecting body when the car door is manually moved in the opening direction from the landing through the landing door.

7. The elevator car door device according to any one of claims 1 to 6, wherein the telescopic connecting body comprises an upper rod, a guide member, and a return spring, the guide member having a spring seat, the upper rod comprising a rod body passing through the spring seat, a spring receiver provided at the lower end of the rod body, and a rod stopper provided in the middle of the rod body on the opposite side of the spring seat from the spring receiver, the return spring is provided between the spring seat and the spring receiver, and in the normal state, the rod stopper is pressed against the surface of the spring seat opposite to the return spring by the spring force of the return spring.

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