EP2020396A1

EP2020396A1 - Speed governor for elevator

Info

Publication number: EP2020396A1
Application number: EP06756437A
Authority: EP
Inventors: Mineo Okada
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2006-05-22
Filing date: 2006-05-22
Publication date: 2009-02-04
Also published as: WO2007135725A1; EP2020396A4; JPWO2007135725A1; JP4905360B2

Abstract

There is provided an elevator governor capable of being subjected to recovery work from the outside of a shaft even in the case where a car is positioned in the topmost portion of the shaft. The elevator governor includes a recovery lever which can be displaced between the normal position and the recovery position, and turns a claw to be engaged with the trip lever by being displaced from the normal position to the recovery position; operating means for displacing the recovery lever by remote operation; and rotating means which forcedly rotates a sheave in the same direction as the direction of rotation at the time when the car is operated in the upward direction, whereby the claw is moved to the position of the recovery lever even in the case where the car is stopping.

Description

Technical Field

The present invention relates to an elevator governor capable of being remotely recovered even in the case where a car is positioned in the topmost portion in an elevator in which the governor is provided in a shaft.

Background Art

The configuration of a conventional elevator governor is shown in Figures 11 to 16 (for example, refer to Patent Document 1). Figure 11 is a general configuration view showing one example of an elevator provided with a conventional elevator governor, Figure 12 is a detail view showing the configuration of a conventional governor, Figure 13 is a front view showing an essential portion of a governor, Figure 14 is a front view showing a state in which a recovery lever shown in Figure 13 is swingingly moved to the recovery position, Figure 15 is a front view showing an essential portion of a governor in the case where a protrusion is located at a position such as not to face rightly to a recovery lever, and Figure 16 is a front view showing a state in which the recovery lever shown in Figure 15 is swingingly moved to the recovery position.
In Figure 11, in an upper part in a shaft 1, a driving device 2 is provided. Around a sheave 2a of the driving device 2, a main rope 3 is set. In one end portion of the main rope 3, a car 4 is hung, and in the other end portion of the main rope 3, a counterweight 5 is hung. In the shaft 1, there are provided a pair of car guide rails 6 and a pair of weight guide rails (not shown) for guiding the up-and-down movement of the car 4 and the counterweight 5, respectively.
Under the car 4, a safety gear device 7 for emergently stopping the car 4 is provided. Near the upper end portion of the car guide rails 6, a governor supporting member 8 is fixed. On top of the governor supporting member 8, a governor 9 is supported to detect the overspeed of the car 6 and operate the safety gear device 7.
Near the bottom portion of the shaft 1, a rotatable governor tension sheave 10 is provided. Around the governor 9 and the governor tension sheave 10, the upper end portion and the lower end portion of a governor rope 11 are set, respectively. The governor rope 11 is connected to the safety gear device 7 via a lever 12, and is circulatingly moved with the up-and-down movement of the car 4.
On a hall 13, a hall door 14 is provided. Between the governor 9 and the hall 13 on the highest floor, a recovery wire 41 is arranged. The base end portion on the hall side of the recovery wire 41 is arranged under a landing sill.
Figure 12 is a front view showing the governor 9 shown in Figure 11. In Figure 12, a sheave 21 around which the governor rope 11 passes is supported on a base 23 so as to be rotatable around a sheave shaft 22. To the side surface of the sheave 21, a pair of fly-weights 25 each rotatable around a pin 24 are attached. The paired fly-weights 25 are connected to each other by a link 26.
In one end portion of one of the fly-weights 25, an operation claw 37 is fixed. The fly-weight 25 is turned by a centrifugal force generated by the rotation of the sheave 21. Thereby, the operation claw 37 is displaced to the outside in the radial direction of the sheave 21. Between the other end portion of one of the fly-weights 25 and the sheave 21, a balance spring 27 resisting the centrifugal force is provided. To the base 23, a car stopping switch 28 for operating a brake device (not shown) of the driving device 2 is attached. The car stopping switch 28 has a switch lever 28a that is operated by the operation claw 37.
To the sheave 21, a trip lever 72 that is turnable around a shaft 71 parallel with the pin 24 is attached. A part of the trip lever 72 makes contact with one of the fly-weights 25, and the trip lever 72 is turned around the shaft 71 by the turn of the fly-weight 25.
On the shaft 71, there is provided a torsion spring 73 for urging the trip lever 72 in the direction such that the trip lever 72 is brought into contact with the fly-weights 25 (the clockwise direction in Figure 12).
The base 23 is provided with a ratchet 30 rotatable around the sheave shaft 22. In the outer peripheral portion of the ratchet 30, a large number of teeth are provided. One of the pins 24 pivotally supports a claw 29 that engages selectively with either one of the trip lever 72 and the ratchet 30. The claw 29 is urged in the direction such as to engage with the ratchet 30 by a drag spring 74. The claw 29 normally engages with the trip lever 72 and separates from the ratchet 30, and if the claw 29 is disengaged from the trip lever 72, it is turned by the spring force of the drag spring 74 and engages with the ratchet 30.
To an arm 31 attached turnably to the base 23, a shoe 32 that is pushed against the governor rope 11 is turnably attached. In a spring receiving portion 31a of the arm 31, a spring shaft 33 penetrates. Between one end portion of the spring shaft 33 and the ratchet 30, a connection lever 34 is connected. In the other end portion of the spring shaft 33, a spring receiving member 35 is provided. Between the spring receiving portion 31a and the spring receiving member 35, a rope gripping spring 36 for pressing the shoe 32 against the governor rope 11 is provided.
On the base 23, a recovery lever 42 is attached so as to be swingingly movable around a shaft 43 parallel with the sheave shaft 22. The claw 29 is provided with a rotatable protrusion 44 that is pressed by the swinging movement of the recovery lever 42. Between the base 23 and the recovery lever 42, a return spring 45 is provided to urge the recovery lever 42 in the direction such that the recovery lever 42 separates from the protrusion 44.
The recovery lever 42 is connected with the tip end portion of the recovery wire 41. The recovery wire 41 is inserted through a tube 46 having flexibility, and is guided to the governor 9. The tip end portion of the tube 46 is fixed to the base 23 at a position near the recovery lever 42. This operating means has the recovery wire 41, the return spring 45, and the tube 46.
Figure 13 is a front view showing an essential portion of Figure 12, and Figure 14 is a front view showing a state in which the recovery lever 42 shown in Figure 13 is swingingly moved to the recovery position. In Figure 13, the recovery lever 42 is located at the normal position, and separates from the protrusion 44. When the recovery wire 41 is pulled to the right in Figure 13 from the state shown in Figure 13, the recovery lever 42 is swingingly moved to the recovery position against the return spring 45, and the protrusion 44 is pressed by the recovery lever 42. Thereby, the claw 29 is turned in the clockwise direction in Figure 13 against the drag spring 74, and engages with the trip lever 72.
Next, the operation is explained. If the up-and-down movement speed of the car 4 reaches a first overspeed (usually, about 1.3 times of the rated speed), the operation claw 37 is brought into contact with the switch lever 28a of the car stopping switch 28 by the turning of the fly-weights 25 caused by a centrifugal force, and turns the switch lever 28a. Thereby, the switch 28 is operated, and the power source of the driving device 2 is shut off, by which the car is stopped by the brake device of the driving device 2.
Also, for example, if the main rope 3 is broken, the car 4 continues to lower without stopping even when the driving device 2 stops. If the lowering speed of the car 4 reaches a second overspeed (usually, about 1.4 times of the rated speed), the fly-weights 25 further turn, and accordingly the turning amount of the trip lever 72 increases, so that the claw 29 is disengaged from the trip lever 72. Thereby, the claw 29 is turned by the spring force of the drag spring 74 and engages with a tooth of the ratchet 30. Thus, the ratchet 30 is rotated slightly in the counterclockwise direction in Figure 12 together with the sheave 21.
By this rotation of the ratchet 30, the arm 31 is turned in the counterclockwise direction in Figure 12, and shoe 32 comes into contact with the governor rope 11. Also, the shoe 32 is pressed against the governor rope 11, by which the governor rope 11 is braked. When the circulation of the governor rope 11 is stopped, the lever 12 is operated by the continuation of lowering of the car 4, by which the safety gear device 7 is operated.
Next, the recovery work after the operations of the safety gear device 7 and the governor 9 is explained. In the recovery work, first, the car 4 is raised slightly, and the braking state of the safety gear device 7 with respect to the car guide rail 6 is released. Thereafter, when the car 4 is further raised, the sheave 21 turns in the clockwise direction in Figure 12 via the governor rope 3, and the claw 29 is disengaged from the ratchet 30, by which the ratchet 30 is also turned in the clockwise direction in Figure 12 and returns to the original position. Thereby, the arm 31 returns to the original position, and hence the shoe 32 separates from the governor rope 11.
Subsequently, after the car 4 has been raised to a position such that a worker can get on the ceiling to the car 4, the hall door 14 is opened from the hall 13 on the highest floor so that the worker gets on the ceiling of the car 4. The claw 29 is engaged with the trip lever 72 by putting out the hand from above the car 4 to the governor 9, by which the recovery work is finished.
On the other hand, in the case where the car 4 is positioned near the hall 13 on the highest floor when the governor 9 performs operation at the second overspeed, and the worker cannot get on the ceiling of the car 4 by opening the hall door 14 from this position, the base end portion of the recovery wire 41 under the sill is taken out to the hall side by opening the hall door 14, and the base end portion of the recovery wire 41 is pulled out with respect to the tube 46. Thereby, on the governor 9 side, the recovery lever 42 is swingingly moved in the clockwise direction in Figures 12 to 14 against the return spring 45, and hence the protrusion 44 is pressed by the recovery lever 42. The claw 29 is turned in the clockwise direction in Figures 12 to 14 against the drag spring 73, and engages with the trip lever 72.
In the case where the recovery lever 42 and the protrusion 44 are not positioned so as to face to each other, first, the recovery lever 42 is moved to the recovery position, and then the sheave 21 is rotated in the clockwise direction. Thereby, the protrusion 44 rotating integrally with the sheave 21 is brought into contact with and pressed against the recovery lever 42 at the recovery position.
By the above-described operation, even in the case where the car 4 is positioned near the hall 13 on the highest floor, and the worker cannot get on the ceiling of the car 4 by opening the hall door 14 from this position, the claw 29 can be engaged with the trip lever 72 by the remote operation from the hall 13 side.
Therefore, even in the case where the governor 9 is arranged in the shaft 1, the recovery work of the governor 9 can be performed easily from a remote location without providing, in the hall wall, an opening for the worker to enter into the shaft 1 or to gain access to the governor 9, so that the workability of recovery work can be improved.
Patent Document 1: Japanese Patent Laid-Open No. 2002-370879

Disclosure of the Invention

Problems to be Solved by the Invention

In the conventional elevator governor, the opportunity for the protrusion 44 and the recovery lever 42 to opposedly make contact with each other is only once during the time when the sheave 21 rotates one turn. Therefore, in the case where the protrusion 44 is not located at the position of the recovery lever 42 as shown in Figure 15, even if the recovery lever 42 is swingingly moved by pulling the recovery wire 41, the claw 29 cannot be moved to the recovery position as shown in Figure 16. For this reason, for the recovery, it is necessary to rotate the sheave 21 in the clockwise direction to the position shown in Figure 14. However, to rotate the sheave 21 in the clockwise direction, the car 4 must be raised. In the case where the car 4 is positioned in the topmost portion in the shaft 1, naturally, the car 4 cannot be raised further, so that the sheave 21 cannot also be rotated in the clockwise direction. Therefore, in such a case, there arises a problem in that the governor 9 cannot be recovered from the state in which the safety gear device 7 is operated.
The present invention has been made to solve the above problem, and accordingly an object thereof is to provide an elevator governor capable of being subjected to recovery work from the outside of a shaft even in the case where a car is positioned in the topmost portion of the shaft.

Means for Solving the Problems

The present invention provides an elevator governor including a sheave which is provided in a shaft, around which a governor rope for operating a safety gear device is set, and which is rotated according to the up-and-down movement speed of a car; a fly-weight which is provided on the sheave, and is turned by a centrifugal force generated by the rotation of the sheave; a balance spring for urging the fly-weight in the direction such as to resist the centrifugal force; a ratchet provided so as to be rotatable around a sheave shaft of the sheave; a trip lever which is turnably provided on the sheave, and is turned by the turning of the fly-weight; a claw which is turnably provided on the sheave, normally engages with the trip lever, and, when the lowering speed of the car reaches a predetermined overspeed, disengages from the trip lever and engages with the ratchet to rotate the ratchet in the same direction as that of the sheave; a shoe for braking the governor rope when the ratchet rotates in the same direction as that of the sheave; a recovery lever which can be displaced between the normal position and the recovery position, and turns the claw to be engaged with the trip lever by being displaced from the normal position to the recovery position; operating means for displacing the recovery lever by remote operation; and rotating means which forcedly rotates the sheave in the same direction as the direction of rotation at the time when the car is operated in the upward direction, whereby the claw is moved to the position of the recovery lever even in the case where the car is stopping.

Advantages of the Invention

According to the present invention, even in the case where the car is positioned in the topmost portion of the shaft, the recovery work of governor can be performed from the outside of the shaft.

Brief Description of the Drawings

Figure 1 is a general configuration view showing one example of an elevator provided with an elevator governor in accordance with embodiment 1 of the present invention;
Figure 2 is a detail view showing the configuration of a governor in accordance with embodiment 1 of the present invention;
Figure 3 is a front view showing an essential portion of a governor in accordance with embodiment 1 of the present invention;
Figure 4 is a front view showing a state in which a roller is brought into contact with a sheave by swingingly moving a recovery lever and an arm shown in Figure 3 to the recovery position;
Figure 5 is a front view showing a state in which a sheave is rotated in the clockwise direction by the driving of a roller, and a protrusion is pressed against a recovery lever;
Figure 6 is a front view showing a hall of an elevator provided with an elevator governor in accordance with embodiment 1 of the present invention;
Figure 7 is a sectional view taken along the line VII-VII of Figure 6;
Figure 8 is a sectional view showing an operation state of a recovery wire shown in Figure 7;
Figure 9 is a plan view showing a part of an elevator hall in the case where the base end portion of a recovery wire is arranged on the back side of a hall wall;
Figure 10 is a plan view showing an operation state of a recovery wire shown in Figure 9;
Figure 11 is a general configuration view showing one example of an elevator provided with a conventional elevator governor;
Figure 12 is a detail view showing the configuration of a conventional governor;
Figure 13 is a front view showing an essential portion of a governor;
Figure 14 is a front view showing a state in which a recovery lever shown in Figure 13 is swingingly moved to the recovery position;
Figure 15 is a front view showing an essential portion of a governor in the case where a protrusion is located at a position such as not to face rightly to a recovery lever; and
Figure 16 is a front view showing a state in which a recovery lever shown in Figure 15 is swingingly moved to the recovery position.

Description of Symbols

1: shaft
2: driving device
2a: sheave
3: main rope
4: car
5: counterweight
6: car guide rail
7: safety gear device
8: governor supporting member
9: governor
10: governor tension sheave
11: governor rope
12: lever
13: hall
14: hall door
21: sheave
22: sheave shaft
23: base
24: pin
25: fly-weight
26: link
27: balance spring
28: car stopping switch
28a: switch lever
29: claw
30: ratchet
31: arm
31a: spring receiving portion
32: shoe
33: spring shaft
34: connection lever
35: spring receiving member
36: rope gripping spring
37: operation claw
41: recovery wire
42: recovery lever
43: shaft
44: protrusion
45: return spring
46: tube
47: hall position indicator
48: case
49: link
50: front cover
51: operation tool
52: three-sided frame
53: operation tool
54: actuator
55: wiring
71: shaft
72: trip lever
73: torsion spring
74: drag spring
90: rotating means
91: arm
92: roller
93: shaft

Best Mode for Carrying Out the Invention

The present invention will now be described in more detail with reference to the accompanying drawings.

Embodiment 1

Figure 1 is a general configuration view showing one example of an elevator provided with an elevator governor in accordance with embodiment 1 of the present invention, Figure 2 is a detail view showing the configuration of the governor in accordance with embodiment 1 of the present invention, Figure 3 is a front view showing an essential portion of the governor in accordance with embodiment 1 of the present invention, Figure 4 is a front view showing a state in which a roller is brought into contact with a sheave by swingingly moving a recovery lever and an arm shown in Figure 3 to the recovery position, Figure 5 is a front view showing a state in which the sheave is rotated in the clockwise direction by driving the roller , and a protrusion is pressed against the recovery lever, Figure 6 is a front view showing a hall of the elevator provided with the elevator governor in accordance with embodiment 1 of the present invention, Figure 7 is a sectional view taken along the line VII-VII of Figure 6, Figure 8 is a sectional view showing an operation state of a recovery wire shown in Figure 7, Figure 9 is a plan view showing a part of the elevator hall in the case where the base end portion of the recovery wire is arranged on the back side of the hall wall, and Figure 10 is a plan view showing an operation state of the recovery wire shown in Figure 9.
In Figure 1, in an upper part in a shaft 1, a driving device 2 is provided. Around a sheave 2a of the driving device 2, a main rope 3 is set. In one end portion of the main rope 3, a car 4 is hung, and in the other end portion of the main rope 3, a counterweight 5 is hung. In the shaft 1, there are provided a pair of car guide rails 6 and a pair of weight guide rails (not shown) for guiding the up-and-down movement of the car 4 and the counterweight 5, respectively.
Under the car 4, a safety gear device 7 for emergently stopping the car 4 is provided. Near the upper end portion of the car guide rails 6, a governor supporting member 8 is fixed. On top of the governor supporting member 8, a governor 9 is supported to detect the overspeed of the car 6 and operate the safety gear device 7. The governor 9 has rotating means 90 unlike the conventional governor.
Near the bottom portion of the shaft 1, a rotatable governor tension sheave 10 is provided. Around the governor 9 and the governor tension sheave 10, the upper end portion and the lower end portion of a governor rope 11 are set, respectively. The governor rope 11 is connected to the safety gear device 7 via a lever 12, and is circulatingly moved with the up-and-down movement of the car 4.
On a hall 13, a hall door 14 is provided. Between the governor 9 and the hall 13 on the highest floor, a recovery wire 41 is arranged. The base end portion on the hall side of the recovery wire 41 is arranged under a landing sill.
Figure 2 is a front view showing the governor 9 shown in Figure 1. In Figure 2, a sheave 21 around which the governor rope 11 passes is supported on a base 23 so as to be rotatable around a sheave shaft 22. To the side surface of the sheave 21, a pair of fly-weights 25 each rotatable around a pin 24 are attached. The paired fly-weights 25 are connected to each other by a link.
In one end portion of one of the fly-weights 25, an operation claw 37 is fixed. The fly-weight 25 is turned by a centrifugal force generated by the rotation of the sheave 21. Thereby, the operation claw 37 is displaced to the outside in the radial direction of the sheave 21. Between the other end portion of one of the fly-weights 25 and the sheave 21, a balance spring 27 resisting the centrifugal force is provided. To the base 23, a car stopping switch 28 for operating a brake device (not shown) of the driving device 2 is attached. The car stopping switch 28 has a switch lever 28a that is operated by the operation claw 37.
To the sheave 21, a trip lever 72 that is turnable around a shaft 71 parallel with the pin 24 is attached. A part of the trip lever 72 makes contact with one of the fly-weights 25, and the trip lever 72 is turned around the shaft 71 by the turn of the fly-weight 25.
On the shaft 71, there is provided a torsion spring 73 for urging the trip lever 72 in the direction such that the trip lever 72 is brought into contact with the fly-weights 25 (the clockwise direction in Figure 2).
The base 23 is provided with a ratchet 30 rotatable around the sheave shaft 22. In the outer peripheral portion of the ratchet 30, a large number of teeth are provided. One of the pins 24 pivotally supports a claw 29 that engages selectively with either one of the trip lever 72 and the ratchet 30. The claw 29 is urged in the direction such as to engage with the ratchet 30 by a drag spring 74. The claw 29 normally engages with the trip lever 72 and separates from the ratchet 30, and if the claw 29 is disengaged from the trip lever 72, it is turned by the spring force of the drag spring 74 and engages with the ratchet 30.
To an arm 31 attached turnably to the base 23, a shoe 32 that is pushed against the governor rope 11 is turnably attached. In a spring receiving portion 31a of the arm 31, a spring shaft 33 penetrates. Between one end portion of the spring shaft 33 and the ratchet 30, a connection lever 34 is connected. In the other end portion of the spring shaft 33, a spring receiving member 35 is provided. Between the spring receiving portion 31a and the spring receiving member 35, a rope gripping spring 36 for pressing the shoe 32 against the governor rope 11 is provided.
On the base 23, a recovery lever 42 is attached so as to be swingingly movable around a shaft 43 parallel with the sheave shaft 22. The claw 29 is provided with a rotatable protrusion 44 that is pressed by the swinging movement of the recovery lever 42. Between the base 23 and the recovery lever 42, a return spring 45 is provided to urge the recovery lever 42 in the direction such that the recovery lever 42 separates from the protrusion 44.
The recovery lever 42 is connected with the tip end portion of the recovery wire 41. The recovery wire 41 is inserted through a tube 46 having flexibility, and is guided to the governor 9. The tip end portion of the tube 46 is fixed to the base 23 at a position near the recovery lever 42. This operating means has the recovery wire 41, the return spring 45, and the tube 46.
The rotating means 90 includes a shaft 93 attached to the base 23 in parallel with the sheave shaft 22, an arm 91 attached so as to be swingingly movable around the shaft 93, and a roller 92 that is attached to the side opposite to the shaft 93 of the arm 91 and can be rotatingly driven by remote operation means (not shown) as necessary. The arm 91 is connected with the tip end portion of the recovery wire 41. The recovery wire 41 is inserted through the tube 46, and is also connected to the recovery lever 42 in an exposed portion in front of an insertion inlet.
Figure 3 is a front view showing an essential portion of the governor, Figure 4 is a front view showing a state in which the roller is brought into contact with the sheave by swingingly moving the recovery lever and the arm shown in Figure 3 to the recovery position, and Figure 5 is a front view showing a state in which the sheave is rotated in the clockwise direction by the driving of the roller, and the protrusion is pressed against the recovery lever. In Figure 3, the recovery lever 42 is located at the normal position, and separates from the protrusion 44. Therefore, when the recovery wire 41 is pulled to the right in Figure 3, both of the recovery lever 42 and the arm 91 are swingingly moved against the return spring 45 so that the recovery lever 42 is moved to the recovery position and the arm 91 is moved to the rotation position (refer to the change from Figure 3 to Figure 4). That is to say, the recovery lever 42 is swingingly moved to the recovery position against the return spring 45, and the protrusion 44 is pressed by the recovery lever 42. Thereby, the claw 29 is turned in the clockwise direction in Figure 3 against the drag spring 74, and engages with the trip lever 72. Also, the arm 91 is swingingly moved to the rotation position against the return spring 45 to drive the roller 92 that is brought into contact with the sheave 21 by the movement of the arm 91 in the counterclockwise direction in Figure 4. Thereby, the sheave 21 is rotated in the clockwise direction, and as shown in Figure 5, a state in which the protrusion 44 is pressed against the recovery lever 42 is reached.
Next, the operation is explained. If the up-and-down movement speed of the car 4 reaches a first overspeed (usually, about 1.3 times of the rated speed), the operation claw 37 is brought into contact with the switch lever 28a of the car stopping switch 28 by the turning of the fly-weights 25 caused by a centrifugal force, and turns the switch lever 28a. Thereby, the switch 28 is operated, and the power source of the driving device 2 is shut off, by which the car is stopped by the brake device of the driving device 2.
Also, for example, if the main rope 3 is broken, the car 4 continues to lower without stopping even when the driving device 2 stops. If the lowering speed of the car 4 reaches a second overspeed (usually, about 1.4 times of the rated speed), the fly-weights 25 further turn, and accordingly the turning amount of the trip lever 72 increases, so that the claw 29 is disengaged from the trip lever 72. Thereby, the claw 29 is turned by the spring force of the drag spring 74 and engages with a tooth of the ratchet 30. Thus, the ratchet 30 is rotated slightly in the counterclockwise direction in Figure 12 together with the sheave 21.
By this rotation of the ratchet 30, the arm 31 is turned in the counterclockwise direction in Figure 12, and the shoe 32 comes into contact with the governor rope 11. Also, the shoe 32 is pressed against the governor rope 11, by which the governor rope 11 is braked. When the circulation of the governor rope 11 is stopped, the lever 12 is operated by the continuation of lowering of the car 4, by which the safety gear device 7 is operated.
Next, the recovery work after the operations of the safety gear device 7 and the governor 9 is explained. In the recovery work, first, the car 4 is raised slightly, and the braking state of the safety gear device 7 with respect to the car guide rail 6 is released. Thereafter, when the car 4 is further raised, the sheave 21 turns in the clockwise direction in Figure 12 via the governor rope 3, and the claw 29 is disengaged from the ratchet 30, by which the ratchet 30 is also turned in the clockwise direction in Figure 2 and returns to the original position. Thereby, the arm 31 returns to the original position, and hence the shoe 32 separates from the governor rope 11.
Subsequently, after the car 4 has been raised to a position such that a worker can get on the ceiling to the car 4, the hall door 14 is opened from the hall 13 on the highest floor so that the worker gets on the ceiling of the car 4. The claw 29 is engaged with the trip lever 72 by putting out the hand from above the car 4 to the governor 9, by which the recovery work is finished.
On the other hand, in the case where the car 4 is positioned near the hall 13 on the highest floor when the governor 9 performs operation at the second overspeed, and the worker cannot get on the ceiling of the car 4 by opening the hall door 14 from this position, the base end portion of the recovery wire 41 under the sill is taken out to the hall side by opening the hall door 14, and the base end portion of the recovery wire 41 is pulled out with respect to the tube 46. Thereby, on the governor 9 side, the recovery lever 42 is swingingly moved in the clockwise direction in Figures 12 to 14 against the return spring 45, and hence the protrusion 44 is pressed by the recovery lever 42. The claw 29 is turned in the clockwise direction in Figures 12 to 14 against the drag spring 73, and engages with the trip lever 72.
In the case where the recovery lever 42 and the protrusion 44 are not positioned so as to face to each other, first, the recovery lever 42 is moved to the recovery position, and then the sheave 21 is rotated in the clockwise direction. Thereby, the protrusion 44 rotating integrally with the sheave 21 is brought into contact with and pressed against the recovery lever 42 at the recovery position.
However, in the case where the car 4 is positioned in the topmost portion of the shaft 1, the car 4 cannot be raised to rotate the sheave 21 in the clockwise direction. In this case, the roller 92, which has been brought into contact with the sheave 21 by the movement of the arm 91 swingingly moved to the rotation position by pulling out the recovery wire 41, is driven in the counterclockwise direction in Figure 4. By doing this, the sheave 21 is rotated forcedly in the clockwise direction, and as shown in Figure 5, the protrusion 44 is brought into contact with and pressed against the recovery lever 42 at the recovery position, by which the claw 29 can be engaged with the trip lever 72.
Therefore, even in the case where the car 4 is positioned in the topmost portion of the shaft 1, the recovery work of the governor 9 can be performed easily from the outside of the shaft 1, so that the workability of recovery work can be improved.
As the method for driving the roller 92, an arbitrary method may be used. For example, a method in which the roller 92 is driven electrically by using a motor, or a method in which roller 92 is driven by pulling a wire that has been wound in advance can be used.
Next, one example of a method for storing the recovery wire 41 is explained with reference to Figures 6 to 8. In this example, the base end portion on the hall 13 side of the recovery wire 41 is stored in a hall position indicator 47. The illustration of the internal construction of the hall position indicator 47 is omitted.
The hall position indicator 47 has a case 48 in which the indicator body (not shown) is housed and a front cover 50 connected to the case 48 via a plurality of links 49 so as to be openable and closable. The base end portion of the recovery wire 41 is stored in the case 48, and can be pulled out to the hall 13 side by opening the front cover 50.
When the recovery wire 41 is operated, an operation tool 51 is mounted on the base end portions of the recovery wire 41 and the tube 46. When the governor 9 is recovered, the front cover 50 of the hall position indicator 47 is opened, and the operation tool 51 is mounted on the base end portions of the recovery wire 41 and the tube 46 to pull the base end portion of the recovery wire 41 out of the tube 46.
In this example, the base end portion of the recovery wire 41 is stored in the hall position indicator 47 so that it can be pulled out easily from the hall 13 side. Therefore, the recovery wire 41 can be operated without opening the hall door 14, so that the workability of recovery work can further be improved.
In this example, the base end portion of the recovery wire 41 is stored in the hall position indicator 47. However, it may be stored in a hall pushbutton device (not shown).
Next, another example of a method for storing the recovery wire 41 is explained with reference to Figures 9 and 10. In the above-described example, the base end portion of the recovery wire 41 is stored in the hall position indicator 47. In an example shown in Figures 9 and 10, however, the base end portion of the recovery wire 41 is arranged on the back side of a wall 15 of the hall 13. When the recovery wire 41 is operated, an operation tool 53 is inserted through a clearance between the hall door 13 and a three-sided frame 52 so that the operation tool 53 is engaged with the recovery wire 41. Other portions are configured in the same way as the first embodiment.
Even in the case where the base end portion of the recovery wire 41 is arranged on the back side of the wall 15, the recovery wire 41 can be operated easily in the state in which the hall door 14 is closed.
In the above-described example, the recovery lever 42 is swingingly moved via the recovery wire 41. However, the configuration may be such that, for example, an electromagnetic actuator 54 is connected to the recovery lever 42, and a wiring 55 for operating the actuator 54 is extended to the hall 13 to perform remote operation. Also, the actuator 54 may be operated remotely by radio transmission.
Also, in the above-described example, the recovery lever 42 for turning the claw 29 by means of swinging motion has been shown. However, the recovery lever 42 may be displaced linearly.
Further, in the above-described example, the case where the governor 9 is arranged in an upper part in the shaft 1 has been explained. However, the present invention can be applied to the case where the governor 9 is disposed, for example, in a pit. In this case, the recovery work can be performed easily from the hall side without the going-down of the worker into the pit.

Industrial Applicability

As described above, the elevator governor in accordance with the present invention can be subjected to recovery work from the outside of the shaft even in the case where the car is positioned in the topmost portion of the shaft.

Claims

An elevator governor comprising:
a sheave which is provided in a shaft, around which a governor rope for operating a safety gear device is set, and which is rotated according to the up-and-down movement speed of a car;

a fly-weight which is provided on the sheave, and is turned by a centrifugal force generated by the rotation of the sheave;

a balance spring for urging the fly-weight in the direction such as to resist the centrifugal force;

a ratchet provided so as to be rotatable around a sheave shaft of the sheave;

a trip lever which is turnably provided on the sheave, and is turned by the turning of the fly-weight;

a claw which is turnably provided on the sheave, normally engages with the trip lever, and, when the lowering speed of the car reaches a predetermined overspeed, disengages from the trip lever and engages with the ratchet to rotate the ratchet in the same direction as that of the sheave;

a shoe for braking the governor rope when the ratchet rotates in the same direction as that of the sheave;

a recovery lever which can be displaced between the normal position and the recovery position, and turns the claw to be engaged with the trip lever by being displaced from the normal position to the recovery position;

operating means for displacing the recovery lever by remote operation; and

rotating means which forcedly rotates the sheave in the same direction as the direction of rotation at the time when the car is operated in the upward direction, whereby the claw is moved to the position of the recovery lever even in the case where the car is stopping.
The elevator governor according to claim 1, characterized in that the rotating means has a roller for rotating the sheave when making contact with the sheave, and an arm capable of displacing the position of the roller between the normal position and the recovery position.
The elevator governor according to claim 1 or 2, characterized in that the arm has a return spring urging to the normal position, and a recovery wire.
The elevator governor according to claim 3, characterized in that the base end portion of the recovery wire is stored in a hall position indicator, and can be pulled out to a hall.
The elevator governor according to claim 3, characterized in that the base end portion of the recovery wire is arranged on the back side of a hall wall, and can be operated through a clearance between a hall door and a three-sided frame.
The elevator governor according to any one of claims 3 to 5, characterized in that the same return spring or recovery wire is used for the arm and the operating means.