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 linearly 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]]

[0001] Embodiments of the present invention relate to a governor for an elevator and an elevator. [[Background Art]]

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

[0003] As this type of governor for an elevator, for example, there is known a configuration in which a ratchet pawl engages with a ratchet gear by centrifugal force generated by rotation of a governor sheave to grip and stop a governor rope, and when the governor sheave rotates reversely, the ratchet pawl separates from the ratchet portion and automatically releases the gripping state of the governor rope. [[Prior Art Documents]] [[Patent Documents]]

[0004] [[Patent Document 1]] International Publication No. WO 2020 / 021629 [[Patent Document 2]] Japanese Patent Application Laid-Open No. 2015-101466 [[Patent Document 3]] Specification of Chinese Utility Model No. 220201088 [[Brief Summary of the Invention]] [[Problem 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 rotation axis and rotates in accordance 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 and 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 rotates in accordance with the rotation of the ratchet gear in the first rotational direction, The device also 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 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 supported linearly on the frame and moving linearly 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 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 speed governor of an elevator 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 limiting mechanism in an elevator governor according to the first embodiment, and is a diagram showing the release limiting mechanism in the locked state. [Figure 6] Figure 6 shows the release limiting mechanism in the elevator governor according to the second embodiment. [Figure 7] Figure 7 shows the release limiting mechanism in the elevator governor according to the third 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> Figure 1 is a diagram schematically showing the overall configuration of an elevator according to the first embodiment. The elevator 1 of the present embodiment shown in Figure 1 is installed in a hoistway 1a of a building (also referred to as an architecture), and transports passengers and the like to a desired floor of the building based on call registration obtained by operating various buttons of an operation device in a car 2 and call buttons of a calling device provided at landings on each floor. Of course, the hoistway 1a is provided across a plurality of floors of the building and extends linearly along the vertical direction.

[0012] As shown in Figure 1, the elevator 1 includes a car 2, a counterweight 4, a main rope 6, a drive mechanism 7, a safety gear 18, a governor 14, a governor rope 15, and an elevator control unit not shown.

[0013] The car 2 is accommodated in the hoistway 1a and is supported movably 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 and the like of an operation device for performing various operations of the elevator 1 are provided inside the car 2.

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

[0015] The main rope 6 has the car 2 fixed to one end thereof and the counterweight 4 fixed to the other end thereof. The main rope 6 is wound around a drive sheave 10 of the drive mechanism 7, and is provided such that the car 2 and the counterweight 4 move up and down in opposite directions to each other. That is, the elevator 1 is a so-called traction-type elevator. In this way, the main rope 6 is moved by a hoisting machine, thereby raising and lowering the car 2 and the counterweight 4 in a traction manner.

[0016] The driving mechanism 7 is provided, for example, at an upper portion of a hoistway 1a, and includes a well-known hoist (not shown in the figures) and a driving sheave 10 attached to an output shaft of the hoist. A portion of the main rope 6 located between the counterweight 4 and the car 2 is wound around an upper side of the driving sheave 10. In the driving mechanism 7, the hoist rotationally drives the driving sheave 10 to move the main rope 6 within the hoistway, thereby causing the car 2 and the counterweight 4 to move up and down. Further, the hoist of the driving mechanism 7 is provided with a brake that restricts movement of the main rope 6 (that is, prevents the main rope 6 from moving).

[0017] The elevator control unit is an arithmetic device including a RAM, a ROM, a CPU, input / output ports and a storage device that are not shown in the figures. The elevator control unit is connected to an operating device of the car 2, a call device at a landing on each floor, the driving mechanism 7, and the like, and controls the entire elevator 1.

[0018] The safety gear 18 is attached to a bottom surface of the car 2. The safety gear 18 has a pair of safety gear mechanisms.

[0019] The governor 14 is an example of an elevator governor. The governor 14 is provided, for example, at an upper portion of the hoistway 1a. The governor 14 includes a rotatably provided governor sheave 22 and the like. A governor rope 15 is wound around the governor sheave 22. The governor sheave 22 rotates together with the governor rope 15. A detailed configuration of the governor 14 will be described later.

[0020] The governor rope 15 is formed in an annular shape and is wound around an upper side of the governor sheave 22. Further, a tensioner 17 is suspended from the governor rope 15. The governor rope 15 is connected to the safety gear 18 via a connecting portion. The governor rope 15 travels endlessly (circulates) around the governor sheave 22 and the tensioner 17 in conjunction with the lifting and lowering operation of the car 2. That is, the 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 release restriction mechanism in its locked state.

[0041] As shown in Figures 4 and 5, the release restriction mechanism 50 comprises a movable member 51, a locking member 56, an elastic member 58, and a release part 53.

[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 5). 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 5) 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 linearly movable. Specifically, the locking member 56 is inserted into a guide hole in the guide portion 60a of a support member 60 fixed to the frame 21, and is supported by the guide portion 60a so as to be linearly movable. The base end of the locking member 56 is supported on the support shaft 63. The support shaft 63 is supported on the support member 60 so as to be linearly movable. The locking member 56 is movable between at least an allowable position (Figure 4) and a restricted position (Figure 5). 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 rotational direction R1. The limiting position (Figure 5) is a position that, in response to the movable member 51 having moved (positioned) to the second position, limits (prevents) the movement of the movable member 51 in the opposite direction to the first rotational direction R1, thereby limiting (preventing) the rotation of the ratchet gear 41 in the reverse direction.

[0046] 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.

[0047] The elastic member 58 is supported by the frame 21. Specifically, the elastic member 58 is supported by the frame 21 via a support member 60. The elastic member 58 is positioned parallel to the locking member 56. 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. Specifically, the elastic member 58 is a coil spring. One end of the elastic member 58 is supported by a support portion 60b provided on the support member 60, and the other end of the elastic member 58 is supported by a support shaft 63. The elastic member 58 is provided in an extended state and functions as a tension spring. The elastic member 58 applies force to the support shaft 63 and the locking member 56 in the direction from the allowable position to the restricted position.

[0048] 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.

[0049] The release unit 53 includes a wire 53a, a tube 53c, a mounting part 53d, and an operating part 53e.

[0050] 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 supported by the support shaft 63. 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.

[0051] When the operating unit 53e is subjected to a pulling operation, the wire 53a is pulled, and the wire 53a moves the support shaft 63 and the locking member 56 in the opposite direction to the limiting direction against the elastic force of the elastic member 58, thereby retracting the locking member 56 from the limiting position. The release unit 53, in response to the pulling operation of the operating unit 53e, retracts the locking member 56 from the limiting 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. At this time, the elastic member 58 stretches.

[0052] 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.

[0053] 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.

[0054] 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 moves from the first position (Figure 4) to the second position (Figure 5). As the movable member 51 moves to the second position, the locking member 56 moves to the restricted position by the elastic force of the elastic member 58 (Figure 5). As an example, the locking member 56 moves to the restricted position when the compression amount 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 member 36 on the governor rope 15 and the pressing state against the governor sheave 22 are maintained. Thus, 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, so even when the elevator car 2 jumps upward, the gripping state of the governor rope 15 is suppressed from being released (automatic return).

[0055] 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 moves linearly in the opposite direction to the restricted direction D1, retracting 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 linearly to the allowable position. That is, when the lock member 56 retracts 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.

[0056] 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.

[0057] 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 supported on the frame 21 so as to be linearly movable and moves linearly 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 rotation of the ratchet gear 41 in the opposite direction by restricting the movement of the movable member 51 in the opposite direction.

[0058] 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. In addition, with this configuration, the locking member 56 can be moved to the restricted position by moving the locking member 56 in a straight line.

[0059] 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.

[0060] 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.

[0061] Furthermore, the release unit 53 is connected to the locking member 56 and includes a wire 53a that can pull the locking member 56.

[0062] With this configuration, the locking member 56 can be pulled by pulling the wire 53a.

[0063] 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.

[0064] With this configuration, relative movement between the movable member 51 and the locking member 56 is easily facilitated.

[0065] Furthermore, the movable member 51 has a bearing 55 including a contact portion 55a.

[0066] With this configuration, relative movement between the movable member 51 and the locking member 56 is easily facilitated.

[0067] Furthermore, the governor 14 is supported by the frame 21 via a support member 60 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.

[0068] With this configuration, the elastic member 58 can move the locking member 56 to the restricted position.

[0069] Furthermore, the elastic member 58 and the locking member 56 are arranged in parallel.

[0070] With this configuration, it is easier to reduce the space required for the locking member 56 and the elastic member 58 in the direction of linear movement of the locking member 56.

[0071] The braking mechanism 23 also 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 and is compressed by the arm member 35, which moves as the ratchet gear 41 rotates in the first rotational direction R1. The locking member 56 moves linearly to a 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.

[0072] With this configuration, when the compression amount of the return spring 37 due to the movement of the arm member 35 is less than the maximum amount, the movement of the movable member 51 can be restricted by the locking member 56.

[0073] Furthermore, the elevator 1 of this embodiment is equipped with a speed governor 14.

[0074] With this configuration, it is possible to prevent the governor rope 15 from being accidentally released by the governor 14.

[0075] <Second Embodiment> Figure 6 shows a release limiting mechanism in an elevator governor according to a second embodiment. This embodiment differs from the first embodiment mainly in that the elastic member 58 is aligned with the locking member 56 in the direction of the locking member 56's linear movement. The elastic member 58 is provided in a compressed state and pushes the locking member 56 in the limiting direction D1. The locking member 56 is also connected to 53a via a connecting member 65.

[0076] With this configuration, it is easier to reduce the space required for the locking member 56 and the elastic member 58 in a direction perpendicular to the direction of linear movement of the locking member 56.

[0077] <Third Embodiment> Figure 7 shows the release restriction mechanism in the elevator governor according to the third embodiment. Figure 8 shows the release restriction mechanism in the elevator governor according to the third embodiment.

[0078] As shown in Figures 7 and 8, this embodiment differs from the first embodiment mainly in that the release unit 53 includes a solenoid 71. The linear motion member 71a of the solenoid 71 supports the support shaft 63. That is, the linear motion member 71a of the solenoid 71 supports the locking member 56 and the elastic member 58 via the support shaft 63. When the solenoid 71 is not energized, the linear motion member 71a of the solenoid 71 moves due to the elastic force of the elastic member 58 and the force from the elastic member 58 and the locking member 56. When the solenoid 71 is not energized, the linear motion member 71a of the solenoid 71 moves relative to the body 71b of the solenoid 71 due to the elastic force of the elastic member 58 and the force from the elastic member 58 and the locking member 56. When the solenoid 71 is energized, the linear motion member 71a of the solenoid 71 moves due to the driving force of the body 71b. The linear motion member 71a of the solenoid 71 pulls the locking member 56 against the elastic force of the elastic member 58, causing the locking member 56 to retract from its restricted position.

[0079] As described above, the release unit 53 is connected to the locking member 56 and includes a solenoid 71 capable of pulling the locking member 56.

[0080] With this configuration, the locking member 56 can be pulled by the power of the solenoid 71.

[0081] <Fourth Embodiment> Figure 9 shows the release limiting mechanism in the elevator governor according to the fourth embodiment. This embodiment differs from the first embodiment mainly in that the governor 14 is equipped with a plurality of wires 53a arranged in parallel with each other.

[0082] With this configuration, even if one wire 53a breaks, the other wires 53a can still pull the locking member 56.

[0083] <Fifth Embodiment> Figure 10 shows the release limiting mechanism in the elevator governor according to the fifth embodiment. As shown in Figure 10, this embodiment mainly differs from the first embodiment in that a marker 53m is provided on the wire 53a.

[0084] With this configuration, the worker can visually confirm the amount of tension (stroke) of the wire 53a required to move the locking member 56 to the release position.

[0085] 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.

[0086] 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]

[0087] 1...Elevator, 1a...Hoistway, 2...Elevator car, 7...Drive mechanism, 14...Governor, 15...Governor rope, 21...Frame, 22...Governor sheave, 23...Braking mechanism, 24...Coupling mechanism, 26, 44, 54...Shaft, 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, 53e...Operating part, 53m...Marker, 55...Bearing, 55a...Contact part, 56...Locking member, 58...Elastic member, 60...Support member, 71...Solenoid, Ax1...First rotational axis, R1...First 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 supported on the frame so as to be linearly movable, and moves linearly 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 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 by the locking member. The elevator governor according to claim 1.

3. 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 2.

4. 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.

5. The movable member has a rolling bearing including the contact portion. The elevator governor according to claim 4.

6. The frame is supported via a support member, and an elastic member is provided which 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.

7. The elastic member and the locking member are arranged in parallel. The elevator governor according to claim 6.

8. The elastic member is aligned with the locking member in the direction of linear movement of the locking member, The elevator governor according to claim 6.

9. The aforementioned braking mechanism is, An arm member connected to the ratchet gear, A rope gripping member located on the opposite side of the governor sheave from the governor rope, A return spring is interposed between the arm member and the rope gripping member, and is compressed by the arm member, which moves as the ratchet gear rotates in the first rotational direction; It has, The locking member moves linearly to the limiting position when the amount of compression of the return spring due to the movement of the arm member is less than the maximum. The elevator governor according to claim 1.

10. 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 2.

11. A plurality of the aforementioned wires are provided in parallel with each other, The elevator governor according to claim 3.

12. The wire is equipped with a marking, The elevator governor according to claim 3.

13. An elevator governor comprising the speed governor described in any one of claims 1 to 12, Elevator.

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