Elevator governor and elevator

Abstract

The objective is to obtain a novel configuration that can prevent the governor rope from being erroneously released by the elevator governor when the governor sheave rotates in reverse after the governor rope has stopped moving due to the governor's braking. [Solution] The elevator governor of this embodiment includes a movable member coupled to a ratchet gear and moving around a first rotational axis by the rotation of the ratchet gear, and a locking member movably supported on the frame and moving to a limiting position that receives the movable member in response to the movable member's movement in the first rotational direction by the rotation of the ratchet gear, thereby restricting the movement of the movable member in the reverse direction and thus restricting the rotation of the ratchet gear in the reverse direction.

Description

Technical Field

[0005]

[0001] Embodiments of the present invention relate to an elevator speed governor and an elevator.

Background Art

[0002] Conventionally, in an elevator, the car is moved to an arbitrary floor by the movement of the car in the hoistway. In such an elevator, when at least the descending speed of the car reaches a predetermined speed among the car and the counterweight, a speed governor (elevator speed governor) for stopping at least the car is provided.

[0003] As this type of elevator speed governor, for example, a centrifugal force caused by the rotation of a governor sheave engages a ratchet pawl with a ratchet gear to grip and stop a governor rope, and when the governor sheave rotates in the reverse direction, the ratchet pawl disengages from the ratchet portion and automatically releases the gripping state of the governor rope.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] When the elevator car stops due to the operation of the elevator governor, the counterweight may spring up due to inertia and then free fall. The free fall of the counterweight may cause the governor sheave to rotate in the opposite direction, releasing the governor's grip on the governor rope, i.e., releasing the brake on the governor rope, which may cause the elevator car to descend again.

[0006] Therefore, the object of the embodiment of the present invention is to obtain a novel configuration that can prevent the accidental release of the braking of the governor rope by the elevator governor when the governor sheave rotates in reverse after the movement of the governor rope has stopped due to the braking of the elevator governor. [Means for solving the problem]

[0007] The elevator governor of this embodiment includes a frame, a governor sheave on which a governor rope connected to the elevator car is hung and which is supported on the frame so as to be rotatable around a first rotational axis and which rotates in conjunction with the movement of the governor rope, a ratchet gear which is rotatable relative to the governor sheave, and a ratchet pawl provided on the governor sheave which rotates integrally with the governor sheave, wherein when the rotational speed of the governor sheave, which rotates in the first rotational direction in accordance with the descent of the elevator car, reaches the operating speed of the emergency stop device, the ratchet pawl engages with the ratchet gear so that the ratchet gear is connected to the governor sheave and rotates in the first rotational direction, and a coupling mechanism which is connected to the ratchet gear and which rotates in accordance with the rotation of the ratchet gear in the first rotational direction, the governor sheave and the The device includes: a braking mechanism that brakes the rotation of the ratchet gear in the first rotational direction and the movement of the governor rope, and allows the rotation of the governor sheave and the ratchet gear in the first rotational direction and the movement of the governor rope when the ratchet pawl disengages from the ratchet gear due to the rotation of the governor sheave in the opposite direction to the first rotational direction; a movable member coupled to the ratchet gear and moving around the first rotational axis due to the rotation of the ratchet gear; and a locking member movably supported by the frame and moving to a limiting position to receive the movable member in response to the movement of the movable member in the first rotational direction due to the rotation of the ratchet gear, thereby restricting the movement of the movable member in the opposite direction and thereby restricting the rotation of the ratchet gear in the opposite direction. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram showing the overall configuration of the elevator according to the first embodiment. [Figure 2] Figure 2 is a side view showing the elevator governor according to the first embodiment. [Figure 3] Figure 3 is a side view showing a part of the elevator governor according to the first embodiment. [Figure 4]Figure 4 shows the release limiting mechanism in the elevator governor according to the first embodiment, and is a diagram of the release limiting mechanism in its initial state. [Figure 5] Figure 5 shows a release restriction mechanism in an elevator governor according to the first embodiment, and is a diagram showing the intermediate state in which the release restriction mechanism transitions from the initial state to the locked state. [Figure 6] Figure 6 shows a release restriction mechanism in an elevator governor according to the first embodiment, and depicts the release restriction mechanism in the locked state. [Figure 7] Figure 7 shows the release limiting mechanism in the elevator governor according to the second embodiment. [Figure 8] Figure 8 shows the release limiting mechanism in the elevator governor according to the third embodiment. [Figure 9] Figure 9 shows the release limiting mechanism in the elevator governor according to the fourth embodiment. [Figure 10] Figure 10 shows the release limiting mechanism in the elevator governor according to the fifth embodiment. [Modes for carrying out the invention]

[0009] The following describes exemplary embodiments of the present invention. The configurations (technical features) of the embodiments shown below, as well as the actions and results (effects) brought about by such configurations, are examples only.

[0010] Furthermore, the following embodiments include similar components. These similar components are given common reference numerals, and redundant explanations are omitted. Also, the drawings are schematic, and the dimensional relationships and ratios of each element may differ from reality. Moreover, there may be differences in dimensional relationships and ratios between drawings.

[0011] <First Embodiment> FIG. 1 is a diagram schematically showing the overall configuration of an elevator according to the first embodiment. The elevator 1 according to this embodiment shown in FIG. 1 is installed in a hoistway 1a of a building (also referred to as a structure), and transports passengers and the like to a desired floor of the building based on call registration by operating various buttons of an operating device in the car 2 and call buttons of a calling device provided at each landing. Of course, the hoistway 1a is provided over a plurality of floors of the building and extends linearly along the vertical direction.

[0012] As shown in FIG. 1, the elevator 1 includes a car 2, a counterweight 4, a main rope 6, a drive mechanism 7, an emergency stop device 18, a speed governor 14, a speed governor rope 15, and an elevator control unit (not shown).

[0013] The car 2 is accommodated in the hoistway 1a and is supported to be movable in the vertical direction by a car guide rail (not shown). The car 2 is formed in a box shape and accommodates passengers inside. Various buttons of an operating device for performing various operations of the elevator 1 are provided in the car 2.

[0014] The counterweight 4 is accommodated in the hoistway 1a and is supported to be movable in the vertical direction by a weight guide rail (not shown).

[0015] One end of the main rope 6 is fixed to the car 2, and the other end is fixed to the counterweight 4. The main rope 6 is wound around a drive sheave 10 of the drive mechanism 7 so that the car 2 and the counterweight 4 move up and down in opposite vertical directions. That is, the elevator 1 is a so-called pulley-type elevator. Thus, the main rope 6 is moved by a hoisting machine to raise and lower the car 2 and the counterweight 4 in a bucket-like manner.

[0016] The drive mechanism 7 is provided, for example, at the upper part of the hoistway 1a, and includes a well-known hoisting machine (not shown) and a drive sheave 10 attached to the output shaft of this hoisting machine. The drive sheave 10 has a part located between the counterweight 4 of the main rope 6 and the car 2 hung on the upper side. The drive mechanism 7 drives the drive sheave 10 to rotate by the hoisting machine, moves the main rope 6 in the hoistway, and raises and lowers the car 2 and the counterweight 4. Further, a brake is provided on the hoisting machine of the drive mechanism 7 to restrict the movement of the main rope 6 (that is, not to move the main rope 6).

[0017] The elevator control unit is an arithmetic unit including a RAM, a ROM, a CPU, an input / output port, and a storage device (not shown). The elevator control unit is connected to the operating device of the car 2, the call devices at each landing, the drive mechanism 7, etc., and controls the entire elevator 1.

[0018] The emergency stop device 18 is attached to the bottom surface of the car 2. The emergency stop device 18 has a pair of emergency stop mechanisms.

[0019] The speed governor 14 is an example of an elevator speed governor. The speed governor 14 is provided, for example, at the upper part of the hoistway 1a. The speed governor 14 includes a speed governor sheave 22 provided rotatably, etc. A speed governor rope 15 is hung on the speed governor sheave 22. The speed governor sheave 22 rotates together with the speed governor rope 15. The detailed configuration of the speed governor 14 will be described later.

[0020] The speed governor rope 15 is formed in a ring shape and is hung on the upper side of the speed governor sheave 22. Further, a tensioner 17 is suspended from the speed governor rope 15. The speed governor rope 15 is connected to the emergency stop device 18 via a connecting part. The speed governor rope 15 runs endlessly (circulates) around the speed governor sheave 22 and the tensioner 17 in conjunction with the ascending and descending movement of the car 2. That is, the speed governor rope 15 moves, specifically, circulates.

[0021] When the descending speed of elevator car 2 (the rotational speed of the governor sheave 22) reaches a predetermined set speed, which is the emergency stop device operating speed, the governor 14 stops the movement of the governor rope 15. When the movement of the governor rope 15 stops, the emergency stop device 18 stops elevator car 2 relative to the car guide rail. In other words, the emergency stop device operating speed is the speed at which the emergency stop device 18 operates. The emergency stop device operating speed is also called the emergency stop device operating speed.

[0022] Figure 2 is a side view showing the elevator governor according to the first embodiment. Figure 3 is a side view showing a part of the elevator governor according to the first embodiment.

[0023] As shown in Figure 2, the governor 14 comprises a frame 21, a governor sheave 22, a braking mechanism 23, a coupling mechanism 24, a shaft 26, and a release limiting mechanism 50.

[0024] The frame 21 supports the governor sheave 22, the coupling mechanism 24, and the shaft 26. The shaft 26 is supported by the frame 21 so as to be rotatable around a first rotational axis Ax1.

[0025] Here, the first rotational axis Ax1 is the central axis (centerline) of the shaft 26 and the governor sheave 22. That is, the axial, radial, and circumferential directions of the first rotational axis Ax1 are the same as the axial, radial, and circumferential directions of the shaft 26 and the governor sheave 22. In the following description, unless otherwise specified, the axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the first rotational axis Ax1, i.e., the axial, radial, and circumferential directions of the shaft 26. In this embodiment, the axial direction is along the horizontal direction.

[0026] As shown in Figures 2 and 3, the frame 21 has a bottom wall 21a, a pair of support walls 21b and 21c, and a connecting wall 21d. The support wall 21b is provided with an arc-shaped elongated hole 21e whose longitudinal direction is the circumferential direction of the first rotational axis Ax1.

[0027] The bottom wall 21a is formed as a rectangular, flat plate that extends horizontally. The bottom wall 21a is attached, for example, to the floor of the machine room or inside the elevator shaft 1a via mounting members.

[0028] The pair of support walls 21b and 21c are each formed in a substantially triangular, flat plate shape, and are arranged parallel to each other with a gap between them in the axial direction, extending vertically upward from the bottom wall 21a. The pair of support walls 21b and 21c rotatably support the shaft 26. By rotatably supporting the shaft 26, the pair of support walls 21b and 21c rotatably support the governor sheave 22 between them.

[0029] The connecting wall 21d is provided along the vertically extending edges of the pair of support walls 21b and 21c, connecting the pair of support walls 21b and 21c.

[0030] The governor sheave 22 is supported on the frame 21 so as to be rotatable around a first rotational axis Ax1. A governor rope 15, which is connected to the elevator car 2, is hung over the governor sheave 22. The governor sheave 22 rotates as the governor rope 15 moves.

[0031] As shown in Figure 3, the coupling mechanism 24 includes a pair of flyweights 25, a speed adjustment spring, and a ratchet mechanism 40.

[0032] A pair of flyweights 25 are mounted on a governor sheave 22 with the shaft 26 positioned between them, and rotate integrally with the governor sheave 22. The pair of flyweights 25 are also rotatably supported on the governor sheave 22 via a support shaft. The support shaft is positioned eccentrically with respect to the center of gravity of the flyweights 25. The pair of flyweights 25 are connected to each other by a link.

[0033] The speed adjustment spring is mounted on the governor sheave 22 and rotates integrally with the governor sheave 22. The speed adjustment spring is elastically compressed in response to the rotation of the flyweight 25 around the support shaft, which is caused by the centrifugal force acting on it as the governor sheave 22 rotates.

[0034] The ratchet mechanism 40 includes a ratchet gear 41 and a ratchet pawl 42.

[0035] The ratchet gear 41 is supported on the frame 21 so as to be rotatable around the first rotational axis Ax1 (shaft 26). The ratchet gear 41 is rotatable relative to the governor sheave 22.

[0036] The ratchet pawl 42 is mounted on the governor sheave 22 and rotates integrally with the governor sheave 22. The ratchet pawl 42 is supported on the governor sheave 22 so as to be rotatable around the shaft 44 within a predetermined angular range. The ratchet pawl 42 is also connected to the flyweight 25 via a connecting member 33. When the rotational speed of the governor sheave 22 is less than the emergency stop device operating speed (greater than 0), the ratchet pawl 42 separates from the ratchet gear 41 and does not engage with the ratchet gear 41. When the rotational speed of the governor sheave 22 reaches the emergency stop device operating speed, the ratchet pawl 42 rotates around the shaft 44 in accordance with the rotation of the flyweight 25 around its support shaft, which is caused by the centrifugal force accompanying the rotation of the governor sheave 22, and engages with the ratchet gear 41. Specifically, when the rotational speed of the governor sheave 22, which rotates in a first rotational direction R1 in accordance with the descent of the elevator car 2, reaches the operating speed of the emergency stop device, the ratchet pawl 42 engages with the ratchet gear 41, and the ratchet gear 41 connects to the governor sheave 22 and rotates in the first rotational direction R1. As a result, the governor sheave 22 and the braking mechanism 23 are connected, the braking mechanism 23 is activated, the rotation of the governor sheave 22 is stopped by the braking force of the braking mechanism 23, and consequently the movement of the governor rope 15 is stopped.

[0037] As shown in Figure 2, the braking mechanism 23 is connected to the ratchet gear 41. The braking mechanism 23 brakes the rotation of the governor sheave 22 and the ratchet gear 41 in the first rotational direction R1, as well as the movement of the governor rope 15, in accordance with the rotation of the ratchet gear 41 in the first rotational direction R1. The braking mechanism 23 allows the rotation of the governor sheave 22 and the ratchet gear 41, as well as the movement of the governor rope 15, when the ratchet pawl 42 disengages from the ratchet gear 41 due to rotation of the governor sheave 22 in the opposite direction of the first rotational direction R1.

[0038] In detail, the braking mechanism 23 includes an arm member 35, a rope gripping member 36, and a return spring 37. The arm member 35 is connected to a ratchet gear 41. The rope gripping member 36 is located on the opposite side of the governor sheave 22 from the governor rope 15. The return spring 37 is interposed between the arm member 35 and the rope gripping member 36.

[0039] When the ratchet pawl 42 operates and engages with the teeth of the ratchet gear 41, the rotational force of the governor sheave 22 is transmitted to the arm member 35 via the ratchet gear 41. As a result, the arm member 35 is pulled in the first rotational direction R1 by the ratchet gear 41, and while compressing the return spring 37 against its elastic force, it presses the rope gripping member 36 against the rope. As a result, the rope gripping member 36 grasps the governor rope 15 and presses it against the governor sheave 22. This brakes the movement of the governor rope 15, the rotation of the governor sheave 22, and the rotation of the ratchet gear 41, bringing the governor rope 15, the governor sheave 22, and the ratchet gear 41 to a stop. Furthermore, when the movement of the governor rope 15 stops, the emergency stop device 18 operates and the movement of the elevator car 2 stops. From this state, when the elevator car 2 is moved upward by a predetermined operation, the governor sheave 22 rotates in the opposite direction to the first rotation direction R1, i.e., reverses direction. This causes the ratchet pawl 42 to disengage from the teeth of the ratchet gear 41, and the return spring 37, by its restoring force (elastic force), moves the arm member 35 in a direction that separates the rope gripping member 36 from the governor rope 15, releasing the arm member 35 from pressing the rope gripping member 36 against the governor rope 15. As a result, the rope gripping member 36 is released from gripping the governor rope 15 and from pressing it against the governor sheave 22. In other words, the braking by the braking mechanism 23 is released. In this way, after the braking operation, the governor 14 automatically returns to the state before the braking operation (initial state) by the force of the return spring 37.

[0040] Figure 4 shows the release restriction mechanism in the elevator governor according to the first embodiment, and depicts the release restriction mechanism in its initial state. Figure 5 shows the release restriction mechanism in the elevator governor according to the first embodiment, and depicts the mechanism in an intermediate state as it transitions from the initial state to the locked state. Figure 6 shows the release restriction mechanism in the elevator governor according to the first embodiment, and depicts the release restriction mechanism in the locked state.

[0041] As shown in Figures 4 to 6, the release restriction mechanism 50 comprises a movable member 51, a locking member 56, an elastic member 58, a release part 53, and stoppers 59 and 60.

[0042] The movable member 51 is coupled (fixed) to the ratchet gear 41. The movable member 51 protrudes from the frame 21 through the elongated hole 21e in the support wall 21b of the frame 21. The movable member 51 moves around the first rotation axis Ax1 as the ratchet gear 41 rotates. Specifically, the movable member 51 is movable between at least a first position (Figure 4) and a second position (Figure 6). The first position (Figure 4) is a first position in which the ratchet pawl 42 is not engaged with the ratchet gear 41, and the braking mechanism 23 allows the governor sheave 22 and the ratchet gear 41 to rotate in a first rotational direction R1, and the governor rope 15 to move. The second position (Figure 6) is a position on the first rotational direction R1 side relative to the first position, where the ratchet pawl 42 is engaged with the ratchet gear 41, and the braking mechanism 23 brakes the rotation of the governor sheave 22 and the ratchet gear 41 in the first rotational direction R1, as well as the movement of the governor rope 15.

[0043] The movable member 51 moves (rotates) together with the ratchet gear 41. The movable member 51 is also called a stopper member or stopper pin.

[0044] The movable member 51 is composed of, for example, multiple components. As an example, the movable member 51 has a shaft 54 ​​and a bearing 55 as components. The shaft 54 ​​is coupled (fixed) to the ratchet gear 41 and protrudes from the frame 21 through the elongated hole 21e in the support wall 21b of the frame 21. The bearing 55 is mounted on the outer portion of the shaft 54 ​​on the frame 21. The bearing 55 is, for example, a rolling bearing or a sliding bearing. The rolling bearing may be, for example, a ball bearing, and the sliding bearing may be, for example, a maintenance-free sliding bearing. The outer circumferential surface of the bearing 55 constitutes a contact portion 55a that contacts the locking member 56. The contact portion 55a is movable in a first rotational direction R1 while rotating relative to the locking member 56.

[0045] The locking member 56 is provided on the support wall 21b of the frame 21. The locking member 56 is supported on the frame 21 so as to be rotatable about a second rotation axis Ax2 along a first rotation axis Ax1. Specifically, the locking member 56 is supported on the frame 21 so as to be rotatable about the second rotation axis Ax2 via a shaft 57. Specifically, the locking member 56 is movable to at least an allowable position (Figure 4) and a restricted position (Figure 6). The allowable position (Figure 4) is a position that contacts the movable member 51 in the first position and allows the movable member 51 to move in the first rotation direction R1. The restricted position (Figure 6) is a position that, upon receiving the movable member 51 which has moved (was positioned) in the second position, restricts (prevents) the movement of the movable member 51 in the opposite direction of the first rotation direction R1, thereby restricting (preventing) the rotation of the ratchet gear 41 in the reverse direction.

[0046] A bearing 62 is interposed between the locking member 56 and the shaft 57. That is, the bearing 62 is interposed between the frame 21 and the locking member 56. The bearing 62 is a rolling bearing. However, the bearing 62 may also be a sliding bearing.

[0047] The locking member 56 has a claw 56a that receives the movable member 51. The claw 56a has a tip portion 56d and contact portions 56b and 56c. The contact portion 56b is located below the tip portion 56d. The contact portion 56c is located above the tip portion 56d. The contact portion 56c is arc-shaped with respect to the second rotational axis Ax2 in line with respect to the second rotational axis Ax2. The tip portion 56d is capable of moving in the first rotational direction R1 and contacting the movable member 51 that has passed the tip portion 56d of the claw 56a.

[0048] The locking member 56 moves to a limiting position that receives the movable member 51 in response to the movement of the movable member 51 in the first rotational direction R1 due to the rotation of the ratchet gear 41, thereby restricting the movement of the movable member 51 in the reverse direction and thus restricting the rotation of the ratchet gear 41 in the reverse direction. For example, the locking member 56 moves to the limiting position by the elastic force of the elastic member 58.

[0049] The elastic member 58 is supported by the frame 21. The elastic member 58 moves the locking member 56 to the restricted position by elastic force in response to the movement of the movable member 51 in the first rotational direction R1 due to the rotation of the ratchet gear 41. The elastic member 58 is a torsion spring.

[0050] The stopper 60 is supported (fixed) to the frame 21. The stopper 60 is located on the opposite side of the movable member 51 from the locking member 56. The stopper 60 restricts the movement of the locking member 56 by contacting it. The surface 60a (outer surface) of the stopper 60 that contacts the locking member 56 is cylindrical. However, the surface 60a of the stopper 60 that contacts the locking member 56 may be a polygonal cylinder.

[0051] The release unit 53 retracts the locking member 56 from its restricted position against the elastic force of the elastic member 58, thereby releasing the restriction on the movement of the movable member 51 in the reverse direction and the rotation of the ratchet gear 41 in the reverse direction imposed by the locking member 56. The retracted position of the locking member 56 is outside the range of movement of the movable member 51.

[0052] The release unit 53 includes a wire 53a, a tube 53c, a mounting part 53d, and an operating part 53e.

[0053] A portion of the wire 53a is enclosed in the tube 53c. Both ends of the wire 53a protrude from the tube 53c. An attachment portion 53d is provided at one end of the wire 53a. The attachment portion 53d is connected to the locking member 56 by a connecting portion 53b. An operating portion 53e is provided at the other end of the wire 53a. The operating portion 53e is located outside the hoistway 1a of the elevator 1.

[0054] When the operating unit 53e is subjected to a pulling operation, the wire 53a is pulled, causing the locking member 56 to rotate in the opposite direction to the limiting rotation direction R2, thereby retracting the locking member 56 from its restricted position. The release unit 53, in response to the pulling operation of the operating unit 53e, retracts the locking member 56 from its restricted position, thereby releasing the restriction on the movement of the movable member 51 in the reverse direction and the rotation of the ratchet gear 41 in the reverse direction imposed by the locking member 56.

[0055] In the above configuration, when the rotational speed of the governor sheave 22 reaches the first speed, the power supply to the hoisting machine is cut off and the hoisting machine stops. When the rotational speed of the governor sheave 22 reaches the emergency stop device operating speed (second operating speed), which is greater than the first speed, the emergency stop device 18 is activated.

[0056] In the governor 14 with the above configuration, until the elevator car 2's descent speed reaches the emergency stop device's operating speed, even if centrifugal force due to the rotation of the governor sheave 22 acts on the flyweight 25, the biasing force of the speed adjustment spring prevents the ratchet pawl 42 from engaging with the ratchet gear 41.

[0057] Then, when the elevator car 2 descends to the set speed and the rotational speed of the governor sheave 22 reaches the emergency stop device operating speed, the centrifugal force accompanying the rotation of the governor sheave 22 acts on the flyweight 25, causing the ratchet pawl 42 to engage with the ratchet gear 41. At this point, the braking mechanism 23 and the governor sheave 22 are connected via the ratchet mechanism 40. As a result, the braking mechanism 23 is activated, and the rotation of the governor rope 15 and the governor sheave 22 and ratchet gear 41 are braked. As a result, the governor rope 15, governor sheave 22 and ratchet gear 41 come to a stop. At this time, the movable member 51 pushes aside the locking member 56 against the elastic force of the elastic member 58 and moves from the first position (Figure 4) to the second position (Figure 6). The locking member 56 moves to a restricted position by the elastic force of the elastic member 58 in response to the movable member 51 moving to a second position (Figure 6). For example, the locking member 56 moves to the restricted position when the amount of compression of the return spring 37 due to the movement of the arm member 35 is less than the maximum, but is not limited to this. As a result, the movement of the movable member 51 in the opposite direction to the first rotation direction R1 is restricted by the locking member 56, and the rotation of the ratchet gear 41 and the governor sheave 22 in the opposite direction is restricted. Therefore, the gripping state of the governor rope 15 by the rope gripping member 36 and the pressing state against the governor sheave 22 are maintained. Thus, even when the elevator car 2 stops due to the operation of the governor 14, the counterweight 4 jumps upward due to inertia and then free falls, preventing the gripping state of the governor rope 15 from being released (automatic return) even when the elevator car 2 jumps upward.

[0058] When the operating part 53e of the release part 53 is pulled from the state in which the movable member 51 is in the restricted position, the movable member 51 is pulled by the wire 53a and rotates in the opposite direction to the restricted rotation direction R2, moving away from the restricted position. As a result, for example, the elastic force (restoring force) of the return spring 37 pulls the arm member 35, the ratchet gear 41 moves in the opposite direction to the first rotation direction R1, and the movable member 51 moves to the first position. After that, when the pulling operation on the operating part 53e ceases, the elastic force of the elastic member 58 moves the lock member 56 to the allowable position. That is, when the lock member 56 moves away from the restricted position due to the tensile force and the movable member 51 moves from the second position to the first position, and the tensile force acting on the lock member 56 ceases, the lock member 56 moves to the allowable position due to the elastic force.

[0059] The braking mechanism 23 and the coupling mechanism 24 constitute an automatic return mechanism that automatically releases the gripping state of the governor rope 15 when the governor sheave 22 rotates in the opposite direction to the first rotation direction R1. The release restriction mechanism 50 is also called an automatic return prevention device.

[0060] As described above, the governor 14 (governor for elevator 1) of this embodiment comprises a frame 21, a governor sheave 22, a coupling mechanism 24, a braking mechanism 23, a movable member 51, and a locking member 56. The governor sheave 22 is supported on the frame 21 so as to be rotatable around a first rotational axis Ax1, and the governor rope 15 connected to the elevator car 2 is draped over the governor sheave 2, and rotates in conjunction with the movement of the governor rope 15. The coupling mechanism 24 comprises a ratchet gear 41 and a ratchet pawl 42. The ratchet gear 41 is rotatable relative to the governor sheave 22. The ratchet pawl 42 is mounted on the governor sheave 22 and rotates integrally with the governor sheave 22. The coupling mechanism 24, when the rotational speed of the governor sheave 22, which rotates in a first rotational direction R1 in accordance with the descent of the elevator car 2, reaches the operating speed of the emergency stop device, engages with the ratchet gear 41, causing the ratchet gear 41 to connect to the governor sheave 22 and rotate in the first rotational direction R1. The braking mechanism 23 is connected to the ratchet gear 41. The braking mechanism 23 brakes the rotation of the governor sheave 22 and the ratchet gear 41 in the first rotational direction R1, as well as the movement of the governor rope 15, in accordance with the rotation of the ratchet gear 41 in the first rotational direction R1. The braking mechanism 23 allows rotation of the governor sheave 22 and the ratchet gear 41, and movement of the governor rope 15, when the ratchet pawl 42 disengages from the ratchet gear 41 due to rotation of the governor sheave 22 in the opposite direction to the first rotational direction R1. The movable member 51 is coupled to the ratchet gear 41 and moves around the first rotational axis Ax1 as the ratchet gear 41 rotates. The locking member 56 is movably supported on the frame 21 and moves to a limiting position that receives the movable member 51 in response to the movement of the movable member 51 in the first rotational direction R1 as the ratchet gear 41 rotates, thereby restricting the reverse rotation of the ratchet gear 41 by restricting the reverse movement of the movable member 51.

[0061] With this configuration, if the governor sheave 22 rotates in the reverse direction after the governor rope 15 has stopped moving due to the braking of the governor 14, the locking member 56 restricts the rotation of the ratchet gear 41 in the reverse direction, thereby preventing the governor 14 from accidentally releasing its braking force on the governor rope 15. Furthermore, with this configuration, since the movable member 51 is coupled to the ratchet gear 41 and the locking member 56 is supported by the frame 21, the ratchet pawl 42 can be operated more stably compared to when the movable member 51 and the locking member 56 are provided on the ratchet pawl 42.

[0062] Furthermore, the locking member 56 is supported on the frame 21 so as to be rotatable about a second rotation axis Ax2 which is aligned with the first rotation axis Ax1.

[0063] With this configuration, the locking member 56 can be moved to the restricted position by rotating it.

[0064] Furthermore, the locking member 56 has a claw 56a that receives the movable member 51. The claw 56a has a contact portion 56c. The contact portion 56c is capable of contacting the movable member 51 after it has moved in the first rotational direction R1 and passed the tip portion 56d of the claw 56a, and is in the shape of an arc centered on the second rotational axis Ax2 in the axial direction of the second rotational axis Ax2.

[0065] With this configuration, relative movement between the locking member 56 and the contact portion 56c is easily facilitated.

[0066] Furthermore, the governor 14 includes a shaft 57 provided on the frame 21 and a bearing 62 interposed between the shaft 57 and the locking member 56, and the locking member 56 is rotatably supported on the frame 21 via the bearing 62 and the shaft 57.

[0067] With this configuration, the bearing 62 facilitates the smooth rotation of the locking member 56.

[0068] Furthermore, at least the contact portion 55a of the movable member 51 that contacts the locking member 56 is movable in the first rotational direction R1 while rotating relative to the locking member 56.

[0069] With this configuration, relative movement between the movable member 51 and the locking member 56 is easily facilitated.

[0070] Furthermore, the movable member 51 has a bearing 55 including a contact portion 55a.

[0071] With this configuration, relative movement between the movable member 51 and the locking member 56 is easily facilitated.

[0072] Furthermore, the governor 14 is supported by the frame 21 and includes an elastic member 58 that moves the locking member 56 to a restricted position by elastic force in response to the movement of the movable member 51 in the first rotational direction R1 due to the rotation of the ratchet gear 41.

[0073] With this configuration, the elastic member 58 can move the locking member 56 to the restricted position.

[0074] Furthermore, the governor 14 is supported by the frame 21 and is located on the opposite side of the movable member 51 from the locking member 56. It includes a stopper 60 that restricts the movement of the locking member 56 by contacting it.

[0075] With this configuration, it is possible to prevent the locking member 56 from moving beyond a predetermined amount of movement.

[0076] Furthermore, the governor 14 is equipped with a release unit 53. The release unit 53 retracts the locking member 56 from its restricted position, thereby releasing the restriction on the movement of the movable member 51 in the reverse direction and the restriction on the rotation of the ratchet gear 41 in the reverse direction imposed by the locking member 56.

[0077] With this configuration, the release unit 53 can release the restriction on the movement of the movable member 51 in the reverse direction by the locking member 56 and the restriction on the rotation of the ratchet gear 41 in the reverse direction.

[0078] Furthermore, the release unit 53 has an operating unit 53e located outside the hoistway 1a of the elevator 1. In response to the operation of the operating unit 53e, the release unit 53 retracts the locking member 56 from its restricted position, thereby releasing the restriction on the movement of the movable member 51 in the reverse direction and the rotation of the ratchet gear 41 in the reverse direction imposed by the locking member 56.

[0079] With this configuration, by retracting the locking member 56 from its restricted position, operations to release the restriction on the movement of the movable member 51 in the reverse direction and the restriction on the rotation of the ratchet gear 41 in the reverse direction by the locking member 56 can be performed outside the elevator shaft 1a.

[0080] Furthermore, the governor 14 has an elastic member 58. The movable member 51 is movable between a first position in which the ratchet pawl 42 is not engaged with the ratchet gear 41 and the braking mechanism 23 allows rotation of the governor sheave 22 and the ratchet gear 41 in the first rotational direction R1 and movement of the governor rope 15, and a second position which is on the R1 side of the first rotational direction relative to the first position and the ratchet pawl 42 is engaged with the ratchet gear 41 and the braking mechanism 23 brakes rotation of the governor sheave 22 and the ratchet gear 41 in the first rotational direction R1 and movement of the governor rope 15. The locking member 56 is supported on the frame 21 so as to be movable between an allowable position in which it contacts the movable member 51 in the first position and allows movement of the movable member 51 in the first rotational direction R1, and the restricting position which receives the movable member 51 when it has moved to the second position. The elastic member 58 moves the locking member 56 to the restricted position by elastic force. The release unit 53 retracts the locking member 56 from the restricted position against the elastic force by tensile force. When the locking member 56 is retracted from the restricted position by tensile force and the movable member 51 moves from the second position to the first position, and the tensile force acting on the locking member 56 ceases, the locking member 56 moves to the allowable position by elastic force.

[0081] With this configuration, the locking member 56 can be easily returned to the permissible position.

[0082] Furthermore, the bearing 62 is a rolling bearing 62.

[0083] With this configuration, the rotation of the locking member 56 is made even smoother.

[0084] Furthermore, the bearing 62 may be a sliding bearing.

[0085] With this configuration, the bearing 62 can be made relatively simple.

[0086] Furthermore, the elastic member 58 is a torsion spring.

[0087] With this configuration, the elastic member 58 can be made into a relatively simple structure.

[0088] Furthermore, the surface 60a of the stopper 60 that contacts the locking member 56 is cylindrical.

[0089] With this configuration, the shape of the stopper 60 can be made relatively simple.

[0090] Furthermore, the release unit 53 is connected to the locking member 56 and includes a wire 53a that can pull the locking member 56.

[0091] With this configuration, the locking member 56 can be pulled by pulling the wire 53a.

[0092] Furthermore, the elevator 1 of this embodiment is equipped with a speed governor 14.

[0093] With this configuration, it is possible to prevent the governor rope 15 from being accidentally released by the governor 14.

[0094] <Second Embodiment> Figure 7 shows a release limiting mechanism in an elevator governor according to a second embodiment. As shown in Figure 7, this embodiment differs from the first embodiment mainly in the shape of the movable member 51. The movable member 51 of this embodiment has a plate member 71 and coupling members 72 and 73. The plate member 71 has a plurality of ratchet teeth 71a arranged in the circumferential direction of the first rotational axis Ax1. The plate member 71 is coupled (fixed) to the ratchet gear 41 by coupling members 72 and 73. The locking member 56 receives the movable member 51 by the engagement of its pawl 56a with the ratchet teeth 71a. The pawl 56a is also called a ratchet pawl.

[0095] <Third Embodiment> Figure 8 shows a release limiting mechanism in an elevator governor according to a third embodiment. As shown in Figure 8, this embodiment differs from the first embodiment in that the elastic member 58 is a coil spring. The elastic member 58 is provided in a compressed state and pushes the locking member 56 in the limiting rotation direction R2.

[0096] <Fourth Embodiment> Figure 9 shows a release limiting mechanism in an elevator governor according to the fourth embodiment. As shown in Figure 9, this embodiment mainly differs from the first embodiment in that the release unit 53 includes a solenoid 81. The solenoid 81 is coupled to the locking member 56 and can retract the locking member 56 from the limiting position. Specifically, the solenoid 81 pushes a protrusion (receiving part) provided on the locking member 56, thereby rotating the locking member 56 in the opposite direction to the limiting rotation direction R2 and retracting the locking member 56 from the limiting position.

[0097] With this configuration, the locking member 56 can be pulled by the power of the solenoid 81.

[0098] <Fifth Embodiment> Figure 10 shows a release limiting mechanism in an elevator governor according to the fifth embodiment. As shown in Figure 10, this embodiment differs from the first embodiment in that the mounting portion 53d of the release portion 53 is provided with an elongated hole 53f whose direction of movement for the wire 53a is longitudinal, and the mounting portion 53d is connected to the connecting portion 53b with some play using this elongated hole 53f. The connecting portion 53b is inserted into the elongated hole 53f. The elongated hole 53f is movable relative to the connecting portion 53b, and the amount by which the elongated hole 53f and the connecting portion 53b can move relative to each other is the amount of play in the connection between the mounting portion 53d and the connecting portion 53b.

[0099] As described above, the release part 53 has a connecting part 53b and an attachment part 53d. The connecting part 53b is provided on the locking member 56. The attachment part 53d is provided on the end of the wire 53a on the locking member 56 side and is connected to the connecting part 53b with some play.

[0100] With this configuration, even if the wire 53a has operating resistance, it is possible to suppress adverse effects on the operation of the locking member 56.

[0101] If a machine room is located above the hoistway 1a, the drive mechanism 7 and the governor sheave 22 may be located in the machine room.

[0102] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0103] 1...Elevator, 1a...Hoistway, 2...Car, 7...Drive mechanism, 14...Governor (Elevator governor), 15...Governor rope, 21...Frame, 53f...Slotted hole, 22...Governor sheave, 23...Braking mechanism, 24...Coupling mechanism, 26, 44, 54, 57...Shaft, 33...Coupling member, 35...Arm member, 36...Rope gripping member, 37...Return spring, 40...Ratchet mechanism, 41...Ratchet gear, 42...Ratchet pawl, 50...Release limiting mechanism, 51...Movable member, 53 ...Release part, 53a...Wire, 53b...Connecting part, 53c...Tube, 53d...Mounting part, 53e...Operating part, 55,62...Bearing, 55a,56b,56c...Contact part, 56...Locking member, 56a...Claw, 56d...Tip part, 58...Elastic member, 59,60...Stopper, 60a...Surface, 71...Plate member, 71a...Ratchet teeth, 72,73...Connecting member, 81...Solenoid, Ax1...First rotational axis, Ax2...Second rotational axis, R1...First rotational direction, R2...Limiting rotational direction.

Claims

1. Frame and, A governor rope connected to the elevator car is hung on a governor sheave, which is supported on the frame so as to be rotatable around a first rotational axis and rotates in conjunction with the movement of the governor rope. A coupling mechanism comprising a ratchet gear rotatable relative to the governor sheave, and a ratchet pawl provided on the governor sheave and rotating integrally with the governor sheave, wherein when the rotational speed of the governor sheave, which rotates in a first rotational direction in response to the descent of the elevator car, reaches the operating speed of the emergency stop device, the ratchet pawl engages with the ratchet gear, thereby connecting the ratchet gear to the governor sheave and causing it to rotate in the first rotational direction, A braking mechanism connected to the ratchet gear, which, in accordance with the rotation of the ratchet gear in the first rotational direction, brakes the rotation of the governor sheave and the ratchet gear in the first rotational direction and the movement of the governor rope, and allows the rotation of the governor sheave and the ratchet gear and the movement of the governor rope when the ratchet pawl disengages from the ratchet gear due to rotation of the governor sheave in the opposite direction to the first rotational direction. A movable member coupled to the ratchet gear and moving around the first rotational axis by the rotation of the ratchet gear, A locking member is movably supported by the frame and moves to a limiting position that receives the movable member in response to the movement of the movable member in the first rotational direction due to the rotation of the ratchet gear, thereby restricting the movement of the movable member in the reverse direction and thereby restricting the rotation of the ratchet gear in the reverse direction. A speed governor for elevators equipped with [a specific feature / feature].

2. The locking member is supported on the frame so as to be rotatable about a second rotation axis that is along the first rotation axis. The elevator governor according to claim 1.

3. The locking member has a claw that receives the movable member, The claw is capable of moving in the first rotational direction and contacting the movable member that has passed the tip of the claw, and has a contact portion that is arc-shaped around the second rotational axis in line with respect to the axial direction of the second rotational axis. The elevator governor according to claim 2.

4. A shaft provided on the frame, A bearing interposed between the shaft and the locking member, Equipped with, The locking member is rotatably supported on the frame via the bearing and the shaft. The elevator governor according to claim 2.

5. At least the contact portion of the movable member that contacts the locking member is movable in the first rotational direction while rotating relative to the locking member. The elevator governor according to claim 1.

6. The movable member has a bearing including the contact portion. The elevator governor according to claim 5.

7. Supported by the frame, the system includes an elastic member that moves the locking member to the limiting position by elastic force in response to the movement of the movable member in the first rotational direction due to the rotation of the ratchet gear, The elevator governor according to claim 1.

8. Supported by the frame, and positioned on the opposite side of the movable member from the locking member, it includes a stopper that restricts the movement of the locking member by contact with the locking member, The elevator governor according to claim 1.

9. The system includes a release mechanism that retracts the locking member from the aforementioned restricted position, thereby releasing the restriction on the movement of the movable member in the reverse direction and the restriction on the rotation of the ratchet gear in the reverse direction imposed by the locking member. The elevator governor according to claim 1.

10. The release unit has an operating unit located outside the elevator shaft, and in response to the operation of the operating unit, the locking member is retracted from the restricted position, thereby releasing the restriction on the movement of the movable member in the reverse direction and the restriction on the rotation of the ratchet gear in the reverse direction imposed by the locking member. The elevator governor according to claim 9.

11. Having an elastic member, The movable member is movable between a first position in which the ratchet pawl is not engaged with the ratchet gear and the braking mechanism allows rotation of the governor sheave and the ratchet gear in the first rotational direction and movement of the governor rope, and a second position in which the ratchet pawl is engaged with the ratchet gear and the braking mechanism brakes rotation of the governor sheave and the ratchet gear in the first rotational direction and movement of the governor rope. The locking member is supported on the frame so as to be movable between an allowable position that contacts the movable member when it is in the first position and allows the movable member to move in the first rotational direction, and a restricting position that receives the movable member when it has moved to the second position. The elastic member moves the locking member to the restricted position by elastic force. The release part, by tensile force, retracts the locking member from the restricted position against the elastic force, When the locking member retracts from the restricted position due to the tensile force, and the movable member moves from the second position to the first position, and the tensile force on the locking member ceases to act, the locking member moves to the allowable position due to the elastic force. The elevator governor according to claim 9.

12. The bearing is a rolling bearing. The elevator governor according to claim 4.

13. The bearing is a sliding bearing. The elevator governor according to claim 4.

14. The elastic component is a torsion spring. The elevator governor according to claim 7.

15. The elastic member is a coil spring. The elevator governor according to claim 7.

16. The surface of the stopper that contacts the locking member is cylindrical. The elevator governor according to claim 8.

17. The surface of the stopper that contacts the locking member is a polygonal cylindrical shape. The elevator governor according to claim 8.

18. The release part is connected to the locking member and includes a wire capable of pulling the locking member. The elevator governor according to claim 9.

19. The release unit includes a solenoid that is coupled to the locking member and capable of retracting the locking member from the restricted position. The elevator governor according to claim 9.

20. The release unit is The connecting portion provided on the locking member, An attachment portion is provided at the end of the wire on the side of the locking member, and is connected to the connecting portion with some play, It had, The elevator governor according to claim 18.

21. The movable member has a plurality of ratchet teeth, The locking member has a claw that engages with the ratchet teeth to receive the movable member. The elevator governor according to claim 1.

22. An elevator governor comprising the speed governor described in any one of claims 1 to 21, Elevator.

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