Friction force adjustment mechanism for elevator governor and method for adjusting elevator friction force

Abstract

To provide a frictional force adjusting mechanism for an elevator governor that can simplify the frictional force adjusting work and shorten the adjustment work time.SOLUTION: A friction force adjustment mechanism includes an engagement portion provided on an outer periphery of a ring nut screwed onto a cylindrical portion of a fixed flange, and an adjustment jig. The adjustment jig includes a jig body and an engagement rod provided on the jig body and capable of engaging with the engagement portion through the housing through hole and the sheave through hole.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The embodiments relate to a frictional force adjusting mechanism for an elevator governor and a method for adjusting the frictional force of an elevator. [Background technology]

[0002] There is known a governor for stopping a car ascending or descending in an elevator shaft if the car exceeds its speed. The governor, also called a governor, stops the rotation of a governor sheave around which a governor rope that runs in conjunction with the ascending or descending of the car is wound if the car exceeds its speed. When the rotation of the governor sheave stops, the governor rope stops running and an emergency stop device connected to the governor rope is activated. The emergency stop device stops the car on a guide rail that guides the ascending or descending of the car.

[0003] The governor may be equipped with a sheave rotation stopping mechanism and a rope gripping mechanism. In such a governor, when the car exceeds the speed limit, the sheave rotation stopping mechanism stops the rotation of the governor sheave, and the rope gripping mechanism presses and grips the governor rope. This stops the governor rope from running.

[0004] On the other hand, a traction-type governor that stops the running of the governor rope without using a rope gripping mechanism is known. The traction-type governor is configured to increase the frictional force between the governor rope and the governor sheave. As a result, when the rotation of the governor sheave is stopped by the sheave rotation stopping mechanism, the running of the governor rope is stopped by the frictional force.

[0005] In order to increase the friction between the governor rope and the governor sheave, the outer surface of the governor rope may be coated with a high friction material. However, if the rotation of the governor sheave suddenly stops, a large force is generated in the high friction material, which may cause the coating of the high friction material to peel off. To prevent this, the governor sheave is allowed to rotate to a certain extent when it stops rotating.

[0006] More specifically, the sheave rotation stopping mechanism is mainly composed of a pawl provided on the governor sheave and a ratchet, and the rotation of the governor sheave is stopped by the engagement of the pawl with the ratchet. The ratchet is sandwiched between friction materials and pressed against a disc spring, and a frictional force utilizing the repulsive force of the disc spring acts on the ratchet. For this reason, the frictional force acting on the ratchet is adjusted so that the governor sheave can rotate to a certain extent.

[0007] The frictional force acting on the ratchet can be adjusted by removing parts such as the governor sheave, which makes the frictional force adjustment process complicated and time-consuming. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2017-171468 A [Patent Document 2] JP 2017-100865 A Summary of the Invention [Problem to be solved by the invention]

[0009] The embodiments aim to provide a friction force adjustment mechanism for an elevator speed governor and a friction force adjustment method for an elevator speed governor that can simplify the friction force adjustment work and shorten the adjustment work time. [Means for solving the problem]

[0010] The frictional force adjustment mechanism of an elevator governor according to an embodiment is a mechanism for adjusting the frictional force acting on a ratchet rotatably provided with respect to a cylindrical portion of a fixed flange in order to stop rotation of a governor sheave around which a high-friction material-coated rope of the elevator governor is wound. The frictional force adjustment mechanism includes an engagement portion provided on the outer periphery of a ring nut screwed onto the cylindrical portion of the fixed flange, and an adjustment jig. The adjustment jig includes a jig body and an engagement rod provided on the jig body, the engagement rod being capable of engaging with the engagement portion through a housing through-hole of the housing of the elevator governor and a sheave through-hole of the governor sheave.

[0011] A method for adjusting a frictional force of an elevator governor according to an embodiment is a method for adjusting a frictional force using the frictional force adjustment mechanism of the elevator governor described above. The method for adjusting a frictional force includes a step of engaging an engagement rod of an adjustment jig with an engagement portion through a housing through hole and a sheave through hole, and a step of adjusting the frictional force by operating the adjustment jig to rotate the ring nut. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an elevator system according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing an example of the governor rope shown in FIG. [Diagram 3] FIG. 3 is an external perspective view showing the governor body of FIG. [Figure 4] FIG. 4 is a rear view showing the ratchet of the governor body of FIG. [Diagram 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 6 is a perspective view showing a frictional force adjusting mechanism of the speed governor according to the first embodiment. [Figure 7] 7 is a rear perspective view showing the frictional force adjustment mechanism of FIG. 6, illustrating a ring nut. [Figure 8] FIG. 8 is a rear perspective view of the handle of FIG. [Figure 9]FIG. 9 is a front view showing the governor body of FIG. 6 with the front wall of the housing omitted. [Figure 10] FIG. 10 is a perspective view showing a frictional force adjusting mechanism of a speed governor according to the second embodiment. [Figure 11] FIG. 11 is a rear perspective view showing the frictional force adjustment mechanism of FIG. 10, illustrating a ring nut. [Figure 12] FIG. 12 is a rear perspective view of the lever of FIG. [Figure 13] FIG. 13 is a front view of the governor body of FIG. 10 with the front wall of the housing omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] (First embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a frictional force adjusting mechanism for an elevator speed governor and a frictional force adjusting method for an elevator speed governor according to an embodiment of the present invention will be described with reference to the drawings. First, an elevator apparatus according to the present embodiment will be described.

[0014] As shown in FIG. 1, the elevator device 1 includes a car 3 and a counterweight 4 arranged in a hoistway 2. The car 3 and the counterweight 4 are connected via a main rope 5. The main rope 5 is wound around a traction sheave 6a provided on a hoist 6. The hoist 6 winds up the main rope 5, causing the car 3 and the counterweight 4 to rise and fall. The main rope 5 is also wound around a deflection sheave 7. The hoist 6 is installed in a machine room 8 provided above the hoistway 2. An elevator control device (not shown) is installed in the machine room 8. The elevator control device is a device that controls the entire elevator device 1 including the hoist 6. For example, the elevator control device controls the operation of the hoist 6 in response to hall calls and car calls, and causes the car 3 to land at the hall of the floor for which the call is registered.

[0015] The elevator apparatus 1 is not limited to the form shown in FIG. 1. For example, it may be a so-called machine room-less elevator apparatus. That is, the machine room 8 may not be provided, and the hoist 6 and the elevator control device may be provided in the upper part of the hoistway 2, etc. Also, the counterweight 4 may not be connected to the main ropes 5, and the hoist 6 may wind up or pay out the main ropes 5 connected to the car 3. Even in this case, the hoist 6 can raise and lower the car 3 via the main ropes 5. That is, the elevator apparatus 1 may be an elevator apparatus that does not have a counterweight 4.

[0016] As shown in Fig. 1, the elevator device 1 includes an elevator governor (hereinafter simply referred to as governor 20) and an emergency stop device 9. The emergency stop device 9 is attached to the bottom of the car 3. The emergency stop device 9 is connected to a governor rope 21, which will be described later. When the car 3 exceeds the speed limit and the governor rope 21 stops running, the emergency stop device 9 operates to stop the car 3 on a guide rail (not shown) that guides the car 3 as it ascends and descends.

[0017] The governor 20 according to this embodiment will be described below. The governor 20 is a device for stopping the car 3 when the car 3 exceeds its speed. In the example shown in FIG. 1, the governor 20 is provided in the machine room 8, but if the elevator device 1 is a machine room-less type, it may be provided in the upper part of the hoistway 2, etc. The governor 20 according to this embodiment is configured so that the governor rope 21 can be stopped from traveling when the rotation of the governor sheave 32 is stopped by the frictional force between the governor rope 21 and the governor sheave 32. Such a governor 20 is also called a traction type governor.

[0018] As shown in FIG. 1, the governor 20 includes a governor rope 21, a tensioner 26, and a governor body 30.

[0019] As shown in Fig. 1, the governor rope 21 is connected to the car 3 and runs in conjunction with the ascent and descent of the car 3. More specifically, the governor rope 21 is connected to the above-mentioned emergency stop device 9 attached to the lower part of the car 3 via a connecting member 10. As a result, the governor rope 21 is configured to run in synchronization with the ascent and descent of the car 3.

[0020] 2, the outer surface of the above-mentioned governor rope 21 is formed by covering with a high friction material 23. The governor rope 21 is also called a high friction material covered rope.

[0021] More specifically, the governor rope 21 includes a rope body 22 and a high friction material 23 coated on the rope body 22. The configuration of the rope body 22 is not particularly limited. In the example shown in FIG. 2, the rope body 22 includes a core steel 24 and a plurality of strands 25 arranged around the core steel 24. The strands 25 are formed by twisting together steel wires. The high friction material 23 is formed around the strands 25. The high friction material 23 may penetrate into a gap between two adjacent strands 25, or may penetrate into a gap between the core steel 24 and the strands 25. The method of coating the high friction material 23 is arbitrary.

[0022] The high-friction material 23 may be made of any material as long as it is a material that can increase the frictional force between the high-friction material 23 and the sheave groove 32a of the governor sheave 32 described later. The high-friction material 23 may be made of a resin material. Examples of the resin material include polyurethane, polyethylene, polyamide, polyvinyl chloride, and silicon resin. The high-friction material 23 may be polyurethane, which has excellent wear resistance and a high friction coefficient. The high-friction material 23 is not limited to a synthetic resin, and may be a natural resin such as natural rubber.

[0023] The governor sheave 32 is made of a metal material. The metal material may be, for example, a steel material or a cast iron material. The sheave groove 32a of the governor sheave 32 is not covered with a resin material.

[0024] As shown in FIG. 1, the tensioner 26 is disposed at the bottom of the hoistway 2 and applies tension to the governor rope 21. The tensioner 26 includes a tension sheave 27 and a tension weight 28. The governor rope 21 is wound around the tension sheave 27, and the tension weight 28 is attached to the tension sheave 27. The weight of the tension weight 28 applies tension to the governor rope 21, increasing the frictional force between the governor rope 21 and the governor sheave 32. In the governor 20 according to this embodiment, the frictional force is increased by the coating of the high friction material 23 formed on the outer surface of the governor rope 21, as described later. For this reason, the weight of the tension weight 28 may be smaller than the weight of the tension weight 28 when the coating of the high friction material 23 is not formed on the outer surface of the governor rope 21.

[0025] As shown in FIGS. 3 and 4, the governor body 30 may include a housing 31, a governor sheave 32, a safety device 33, and a sheave rotation stopping mechanism .

[0026] The housing 31 may be fixed to the floor of the machine room 8. The housing 31 supports a governor sheave 32 so that the governor sheave 32 is rotatable.

[0027] As shown in Fig. 5, the governor sheave 32 is rotatably supported by the housing 31 via a rotating shaft 35. The above-mentioned governor rope 21 (see Fig. 1) is wound around the governor sheave 32. The governor sheave 32 includes a sheave groove 32a into which the governor rope 21 is inserted. As shown in Figs. 3 and 6, a pair of pendulums 36 are attached to the governor sheave 32. The pendulums 36 are rotatably supported by the governor sheave 32 at a position eccentric to the center of gravity of the pendulums 36.

[0028] The safety device 33 is configured to stop driving the hoist 6 when the car 3 exceeds the speed limit. More specifically, the safety device 33 is activated when the speed of the car 3 reaches a first speed that is higher than the normal speed, and stops driving the hoist 6. For example, as shown in Figs. 3 and 4, the safety device 33 may include an actuator 37 and a limit switch 38. The actuator 37 is attached to a pendulum 36 of the governor sheave 32 and rotates together with the governor sheave 32.

[0029] When the rotation speed of the governor sheave 32 reaches a first rotation speed, the actuator 37 moves to the outer periphery by centrifugal force. This causes the actuator 37 to come into contact with the limit switch 38. The limit switch 38 transmits a signal to stop the driving of the hoisting machine 6 and activate the brake of the hoisting machine 6. The first rotation speed corresponds to the above-mentioned first speed and is higher than the rotation speed of the governor sheave 32 during normal operation.

[0030] The sheave rotation stopping mechanism 34 is configured to stop the rotation of the governor sheave 32 when the car 3 exceeds the speed limit. More specifically, when the speed of the car 3 reaches a second speed that is higher than the first speed, the sheave rotation stopping mechanism 34 is activated to stop the rotation of the governor sheave 32. For example, as shown in FIG. 4, the sheave rotation stopping mechanism 34 may include a pawl 39 and a ratchet 40. The pawl 39 is attached to a pendulum 36 of the governor sheave 32 and rotates together with the governor sheave 32.

[0031] When the rotation speed of the governor sheave 32 reaches the second rotation speed, the pawl 39 moves inward due to centrifugal force. This causes the pawl 39 to engage with the ratchet 40. A frictional force acts on the ratchet 40. The details of this frictional force will be described later. Therefore, when the pawl 39 engages with the ratchet 40, the rotation of the governor sheave 32 is restricted and stopped. The second rotation speed corresponds to the above-mentioned second speed and is greater than the first rotation speed.

[0032] The structure that applies frictional force to the ratchet 40 will be described with reference to FIG.

[0033] As shown in FIG. 3 and FIG. 5, the housing 31 includes a rear wall 31a and a front wall 31b, and a hub 50 is fixed to the rear wall 31a. The hub 50 is an example of a fixed flange. The hub 50 includes a hub flange 51 that abuts against the rear wall 31a, and a first bearing holder 52 that extends from the hub flange 51. The first bearing holder 52 is an example of a cylindrical portion. The first bearing holder 52 extends from the hub 50 to the front side. The first bearing holder 52 holds a first bearing 53, and rotatably supports one end of the above-mentioned rotating shaft 35 via the first bearing 53. The other end of the rotating shaft 35 is rotatably supported by the second bearing holder 54 via a second bearing 55 held by the second bearing holder 54.

[0034] The second bearing holder 54 is supported by the front wall 31b of the housing 31. The second bearing holder 54 may be welded to the front wall 31b. As shown in FIG. 3, the front wall 31b is fixed to the rear wall 31a by using bolts 31c. More specifically, the housing 31 includes a plurality of mounting seats 31d (see FIG. 6) arranged on the front side of the governor 20, and is attached to each mounting seat 31d by bolts 31c. The front wall 31b partially covers the governor sheave 32 from the front.

[0035] 3 and 5, an end surface protrusion 35a is provided on the end surface of the rotating shaft 35. The end surface protrusion 35a is formed on the end surface on the front side of the rotating shaft 35. The end surface protrusion 35a is exposed from an opening 54a of the second bearing holder 54, and protrudes from the second bearing holder 54. The end surface protrusion 35a may be formed in a cylindrical shape. A flat notch may be formed in a part of the end surface protrusion 35a.

[0036] 5, the ratchet 40 described above is disposed between the governor sheave 32 and a hub flange 51 of the hub 50. The ratchet 40 includes an opening 40a, through which a first bearing holder 52 passes. The ratchet 40 is rotatable relative to the first bearing holder 52. The opening 40a may be fitted into the first bearing holder 52.

[0037] The ratchet 40 is pressed against the disc spring 59. More specifically, the disc spring 59 is interposed between the ratchet 40 and the above-mentioned hub flange 51. A first shim 60 is interposed between the ratchet 40 and the disc spring 59. The above-mentioned friction ring 61 is interposed between the ratchet 40 and the first shim 60. The disc spring 59, the first shim 60 and the friction ring 61 each include an opening (not shown) through which the first bearing holder 52 passes, and are each formed in a ring shape. The friction ring 61 may be made of any material as long as it can increase the frictional force acting on the ratchet 40. The friction ring 61 may be made of a resin material.

[0038] A ring nut 62 is disposed on the opposite side of the ratchet 40 from the hub flange 51. The ring nut 62 includes an opening 62a (see FIG. 7) through which the first bearing holder 52 passes. The ring nut 62 is screwed into the first bearing holder 52. More specifically, a female thread is formed on the inner peripheral surface of the ring nut 62, and a male thread is formed on the outer peripheral surface of the first bearing holder 52, and the female thread and the male thread are engaged with each other. By rotating the ring nut 62, the force pressing the ratchet 40 against the hub flange 51 can be increased or decreased. A second shim 63 is interposed between the ring nut 62 and the ratchet 40. A friction ring 61 is interposed between the ratchet 40 and the second shim 63. As a result, the ratchet 40 is sandwiched between the two friction rings 61. The friction ring 61 and the second shim 63 each include an opening (not shown) through which the first bearing holder 52 passes, and are each formed in a ring shape.

[0039] Next, the frictional force adjusting mechanism 70 of the elevator governor according to this embodiment will be described. The frictional force adjusting mechanism 70 is a mechanism for adjusting the frictional force acting on the ratchet 40.

[0040] 6 and 7, the frictional force adjustment mechanism 70 includes a plurality of recesses 71 provided in the ring nut 62, and a handle 72. The recesses 71 are an example of an engagement portion. The handle 72 is an example of an adjustment jig.

[0041] As shown in Fig. 7, the recesses 71 are provided on the outer periphery of the ring nut 62 described above. The recesses 71 are formed so as to open to the outer periphery. The recesses 71 may be formed at equal intervals in the circumferential direction. A protrusion 73 is formed between two adjacent recesses 71. The ring nut 62 has a gear-like shape with relatively large teeth.

[0042] As shown in FIGS. 6 to 8, the handle 72 includes a jig body 74, an engagement rod 75, and a grip .

[0043] The jig body 74 is formed in a disk shape. When the engagement rod 75 of the handle 72 is engaged with the recess 71 of the ring nut 62, the jig body 74 is disposed on the opposite side of the governor sheave 32 to the ring nut 62.

[0044] The engagement rod 75 is provided on the jig body 74. It extends from one surface of the jig body 74. As shown in FIG 7, the engagement rod 75 extends from the surface of the jig body 74 facing the governor sheave 32.

[0045] 7 and 8, the engagement rod 75 may include a locking piece 75a provided at the tip. The locking piece 75a may be inserted into the recess 71 and abut against the protrusion 73, thereby enabling the engagement rod 75 to engage with the recess 71. However, the engagement rod 75 does not have to include the locking piece 75a. In this case, the configuration of the engagement rod 75 is arbitrary as long as at least a part of the tip of the engagement rod 75 is inserted into the recess 71 and the engagement rod 75 can engage with the recess 71.

[0046] 8, two engagement rods 75 may extend from a jig body 74. The two engagement rods 75 may be disposed at positions point-symmetric with respect to the center of the jig body 74. In this case, the two engagement rods 75 may be disposed at positions 180° apart from the center of the jig body 74.

[0047] 6 to 8, the handle 76 is provided on the surface of the jig body 74 opposite the engagement rod 75 and extends from that surface. As shown in Fig. 6, the handle 76 is provided on the surface of the jig body 74 opposite the governor sheave 32.

[0048] 6 and 8, a fitting hole 77 may be provided in the jig body 74. The end surface protrusion 35a of the rotation shaft 35 described above can be fitted into the fitting hole 77. The fitting hole 77 is disposed in the center of the jig body 74. The fitting hole 77 is formed in a circular shape and is rotatable relative to the end surface protrusion 35a.

[0049] 3, a housing through-hole 78 is provided in the front wall 31b of the housing 31. The housing through-hole 78 is disposed at a position overlapping with the recess 71 of the ring nut 62 when viewed in the axial direction of the rotation shaft 35 (a direction perpendicular to the paper surface of FIG. 9). The housing through-hole 78 is adapted so that the engagement rod 75 of the handle 72 can be inserted therein.

[0050] The housing through hole 78 may be formed in an arc shape so as to extend in the circumferential direction of the governor sheave 32. Four housing through holes 78 may be provided in the front wall 31b. The four housing through holes 78 may be disposed at equal intervals in the circumferential direction of the governor sheave 32.

[0051] As shown in Fig. 9, the governor sheave 32 described above is provided with a sheave through hole 79. The sheave through hole 79 is disposed at a position overlapping with the recess 71 of the ring nut 62 when viewed in the axial direction of the rotating shaft 35 (a direction perpendicular to the paper surface of Fig. 9). Each sheave through hole 79 is disposed at the same radial position as each housing through hole 78 and recess 71 with respect to the center of the rotating shaft 35. The sheave through hole 79 is adapted so that the engagement rod 75 of the handle 72 can be inserted therein.

[0052] The sheave through hole 79 may be formed in an arc shape so as to extend in the circumferential direction of the governor sheave 32. Two sheave through holes 79 may be provided in the governor sheave 32. The two sheave through holes 79 may be disposed at positions point-symmetrical with respect to the center of the governor sheave 32.

[0053] Next, a method for adjusting the frictional force of an elevator governor according to this embodiment will be described.

[0054] First, in the rope tension removing process, the tension of the governor rope 21 is removed. This allows the governor rope 21 to be lifted off the governor sheave 32, improving the workability of adjusting the frictional force. For example, the tension of the governor rope 21 may be removed by hanging the governor rope 21 on a governor stand (not shown).

[0055] Next, as a handle attachment step, as shown in Fig. 6, the engagement rods 75 of the handle 72 are engaged with the recesses 71 of the ring nut 62. In this case, the two engagement rods 75 are inserted into the recesses 71 through the corresponding housing through-holes 78 in the front wall 31b of the housing 31 and the corresponding sheave through-holes 79 in the governor sheave 32. Then, the two engagement rods 75 are engaged with the corresponding recesses 71. In addition, the end surface protrusions 35a of the rotating shaft 35 are fitted into the fitting holes 77 provided in the jig body 74 of the handle 72.

[0056] Next, as an adjustment step, the handle 72 is operated. More specifically, the handle 72 is rotated. This causes the ring nut 62 to rotate, and the frictional force acting on the ratchet 40 can be adjusted. When the handle 72 is rotated, the engagement rod 75 of the handle 72 moves in the circumferential direction along the shapes of the housing through hole 78 and the sheave through hole 79. Then, the engagement rod 75 is once pulled out of the recess 71, and the engagement rod 75 is engaged with another recess 71 that overlaps with the housing through hole 78 and the sheave through hole 79 and is located in the opposite direction to the rotation direction of the handle 72, and the handle 72 is rotated. Then, the handle 72 is further rotated, and the engagement rod 75 moves in the circumferential direction along the shapes of the housing through hole 78 and the sheave through hole 79. By repeating such operations, the ring nut 62 can be rotated, and the frictional force can be adjusted.

[0057] The details of the adjustment process will be described taking as an example a case where the male and female threads are right-handed. By rotating the handle 72 clockwise, the force pressing the ratchet 40 against the hub flange 51 can be increased. This increases the repulsive force of the disc spring 59 described above, and the frictional force acting on the ratchet 40 can be increased. On the other hand, by rotating the handle 72 counterclockwise, the force pressing the ratchet 40 against the hub flange 51 can be decreased. This decreases the repulsive force of the disc spring 59 described above, and the frictional force acting on the ratchet 40 can be reduced.

[0058] The frictional force is adjusted so as to stop the rotation of the governor sheave 32 and prevent the coating of the high friction material 23 from peeling off. For example, if the ratchet 40 is supported by the hub 50 so as not to rotate, when the ratchet 40 stops the rotation of the governor sheave 32, the rotation of the governor sheave 32 stops suddenly. In this case, a large force is generated on the coating of the high friction material 23 of the governor rope 21, and there is a possibility that the coating of the high friction material 23 will peel off. For this reason, by adjusting the frictional force acting on the ratchet 40 as described above, the ratchet 40 can be rotated to a certain extent and the generation of a large force on the coating of the high friction material 23 can be prevented.

[0059] After the adjustment step, a handle removal step is performed in which the handle 72 is removed. More specifically, the handle 72 can be removed by pulling out the engagement rod 75 from the recess 71, the housing through-hole 78, and the sheave through-hole 79.

[0060] After the handle removal process, as a rope tensioning process, the governor rope 21 is removed from the above-mentioned governor stand and tension is applied to the governor rope 21. This allows the governor 20 to be restored.

[0061] Thus, according to this embodiment, the engaging rod 75 of the handle 72 engages with the recess 71 provided on the outer periphery of the ring nut 62 screwed into the first bearing holder 52 of the hub 50. The engaging rod 75 engages with the recess 71 through the housing through hole 78 and the sheave through hole 79 that overlap with the recess 71 when viewed in the axial direction. This reduces the disassembly work of parts such as the governor sheave 32 when adjusting the frictional force of the ratchet 40. In addition, the ring nut 62 can be rotated by rotating the handle 72 while it is engaged with the recess 71 of the ring nut 62. This allows the force pressing the ring nut 62 against the hub 50 to be adjusted, and the frictional force acting on the ratchet 40 to be adjusted. This simplifies the adjustment work of the frictional force, and shortens the adjustment work time.

[0062] Furthermore, according to this embodiment, the engagement rod 75 of the handle 72 extends from the surface of the jig body 74 facing the governor sheave 32. This allows the engagement rod 75 to pass through a housing through-hole 78 provided in the front wall 31b of the housing 31 and a sheave through-hole 79 provided in the governor sheave 32 and engage with the recess 71 of the ring nut 62. Therefore, by rotating the handle 72, the ring nut 62 can be rotated to adjust the frictional force, which simplifies the adjustment of the frictional force.

[0063] Furthermore, according to this embodiment, a knob 76 is provided on the surface of the jig body 74 of the handle 72 opposite the governor sheave 32. This makes it possible to easily rotate the handle 72 by gripping the knob 76. This simplifies the adjustment of the frictional force.

[0064] Furthermore, according to this embodiment, the end surface protrusion 35a provided on the end surface of the rotating shaft 35 of the governor sheave 32 is rotatably fitted into the fitting hole 77 of the jig body 74. This allows the handle 72 to be rotated around the end surface protrusion 35a as a fulcrum, stabilizing the operation of the handle 72. This simplifies the adjustment of the frictional force and shortens the time required for the adjustment.

[0065] Furthermore, according to this embodiment, the housing through-hole 78 provided in the front wall 31b of the housing 31 and the sheave through-hole 79 provided in the governor sheave 32 are formed in an arc shape so as to extend in the circumferential direction of the governor sheave 32. This makes it easy to adjust the circumferential position of the engagement rod 75 relative to the recess 71 of the ring nut 62, and allows the engagement rod 75 to easily engage with the recess 71. This simplifies the adjustment of the frictional force.

[0066] (Second embodiment) Next, a frictional force adjusting mechanism for an elevator speed governor and a frictional force adjusting method for an elevator speed governor according to a second embodiment will be described with reference to Figs.

[0067] The second embodiment shown in Figures 10 to 13 is different in that the jig body of the adjustment jig is formed in a long and narrow plate shape and an engagement rod is provided at one end of the jig body, and other configurations are substantially the same as those of the first embodiment shown in Figures 1 to 9. In Figures 10 to 13, the same parts as those in the first embodiment shown in Figures 1 to 9 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0068] 10 and 11, the frictional force adjustment mechanism 70 according to the present embodiment includes a nut gear part 80 provided on the ring nut 62, and a lever 81. The nut gear part 80 is an example of an engagement part. The lever 81 is an example of an adjustment jig.

[0069] 11, the nut gear portion 80 is provided on the outer circumferential edge of the above-mentioned ring nut 62. The nut gear portion 80 is formed in a ring shape.

[0070] As shown in FIGS. 10 to 12, the lever 81 includes a jig body 74, an engagement rod 75, and a handle .

[0071] The jig body 74 is formed in a long and narrow plate shape. When the engagement rod 75 of the handle 72 is engaged with the nut gear portion 80 of the ring nut 62, the jig body 74 is disposed on the opposite side of the governor sheave 32 from the ring nut 62.

[0072] The engagement rod 75 according to this embodiment is provided at one end of the jig body 74. The engagement rod 75 extends from one surface of the jig body 74. As shown in Fig. 11, the engagement rod 75 extends from the surface of the jig body 74 facing the governor sheave 32.

[0073] 11 and 12, the engagement rod 75 may include a lever gear portion 82 provided at the tip thereof. The lever gear portion 82 may mesh with the nut gear portion 80, thereby enabling the engagement rod 75 to engage with the nut gear portion 80.

[0074] 10 to 12, handle 76 is provided at the other end of jig body 74. Handle 76 is disposed at the end of jig body 74 opposite engagement rod 75. Handle 76 is provided on the surface of jig body 74 opposite engagement rod 75, and extends from that surface.

[0075] 10, housing through hole 78 according to the present embodiment is disposed at a position overlapping with nut gear portion 80 of ring nut 62 when viewed in the axial direction of rotating shaft 35. Housing through hole 78 allows engagement rod 75 of lever 81 to be inserted therein. Housing through hole 78 may be formed in an arc shape so as to extend in the circumferential direction of governor sheave 32.

[0076] 13, the sheave through holes 79 according to this embodiment are disposed at positions overlapping with the nut gear portion 80 of the ring nut 62 when viewed in the axial direction of the rotating shaft 35. Each sheave through hole 79 is disposed at the same radial position as each housing through hole 78 and the nut gear portion 80 with respect to the center of the rotating shaft 35. The sheave through holes 79 are configured so that the engagement rod 75 of the lever 81 can be inserted therein.

[0077] The sheave through hole 79 according to the present embodiment may be formed in a circular shape. In the present embodiment as well, the governor sheave 32 may be provided with two sheave through holes 79. The two sheave through holes 79 may be disposed at positions point-symmetrical with respect to the center of the governor sheave 32.

[0078] When adjusting the frictional force of the ratchet 40 of the elevator governor 20, the engagement rod 75 of the lever 81 is engaged with the nut gear part 80 of the ring nut 62. In this case, the engagement rod 75 passes through one of the housing through holes 78 in the front wall 31b of the housing 31 and one of the sheave through holes 79 in the governor sheave 32 to reach the nut gear part 80. Then, the lever gear part 82 of the engagement rod 75 is engaged with the nut gear part 80. After that, the lever 81 is operated. More specifically, the ring nut 62 is rotated by rotating the lever 81, and the frictional force acting on the ratchet 40 can be adjusted. In this embodiment, the frictional force of the governor rope 21 may be adjusted in a state where it is wound around the governor sheave 32, but the frictional force may also be adjusted in a state where the tension of the governor rope 21 is removed.

[0079] Thus, according to this embodiment, the engagement rod 75 of the lever 81 is engaged with the nut gear part 80 provided on the outer periphery of the ring nut 62 screwed into the first bearing holder 52 of the hub 50. The engagement rod 75 is engaged with the nut gear part 80 through the housing through hole 78 and the sheave through hole 79 that overlap with the nut gear part 80 when viewed in the axial direction. This reduces the disassembly work of parts such as the governor sheave 32 when adjusting the frictional force of the ratchet 40. In addition, the ring nut 62 can be rotated by rotating the lever 81 while it is engaged with the nut gear part 80 of the ring nut 62. This makes it possible to adjust the force pressing the ring nut 62 against the hub 50, and thus to adjust the frictional force acting on the ratchet 40. This simplifies the adjustment work of the frictional force, and shortens the adjustment work time.

[0080] Furthermore, according to this embodiment, the engagement rod 75 of the lever 81 extends from the surface of the jig body 74 facing the governor sheave 32. This allows the engagement rod 75 to pass through the housing through-hole 78 and the sheave through-hole 79 and engage with the nut gear portion 80 of the ring nut 62. Therefore, by rotating the lever 81, the ring nut 62 can be rotated to adjust the frictional force, which simplifies the adjustment of the frictional force.

[0081] Furthermore, according to this embodiment, a handle 76 is provided on the surface of the jig body 74 of the lever 81 opposite to the governor sheave 32. This makes it possible to easily rotate the lever 81 by gripping the handle 76. This simplifies the adjustment of the frictional force.

[0082] According to the embodiment described above, the adjustment work of the frictional force can be simplified and the adjustment work time can be shortened.

[0083] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0084] 20: governor, 21: governor rope, 31: housing, 32: governor sheave, 35: rotating shaft, 35a: end surface convex portion, 40: ratchet, 50: hub, 52: first bearing holder, 62: ring nut, 70: frictional force adjustment mechanism, 71: recess, 72: handle, 74: jig body, 75: engagement rod, 76: grip, 77: fitting hole, 78: housing through hole, 79: sheave through hole, 80: nut gear portion, 81: lever, 82: lever gear portion

Claims

1. A friction adjustment mechanism for adjusting a friction force acting on a ratchet that is rotatably provided with respect to a cylindrical portion of a fixed flange in order to stop rotation of a governor sheave around which a high-friction material-coated rope of an elevator governor is wound, comprising: an engagement portion provided on an outer circumferential edge of a ring nut screwed into the cylindrical portion of the fixing flange; An adjustment jig; Equipped with The adjustment jig includes a jig body and an engagement rod provided on the jig body, the engagement rod being capable of engaging with the engagement portion through a housing through-hole of a housing of the elevator governor and a sheave through-hole of the governor sheave. Friction adjustment mechanism for elevator governor.

2. The jig body is formed in a disk shape, The engagement rod extends from a surface of the jig body facing the governor sheave.

2. The frictional force adjusting mechanism of an elevator governor according to claim 1.

3. A handle is provided on the surface of the jig body opposite to the governor sheave. The frictional force adjusting mechanism of an elevator governor according to claim 2.

4. The jig body is provided with a fitting hole into which an end surface protrusion provided on an end surface of the rotating shaft of the governor sheave is fitted. The frictional force adjusting mechanism of an elevator governor according to claim 2 or 3.

5. The housing through hole and the sheave through hole are formed in an arc shape so as to extend in the circumferential direction of the governor sheave. The frictional force adjusting mechanism for an elevator governor according to any one of claims 1 to 3.

6. The jig body is formed in an elongated plate shape, The engagement rod is provided at one end of the jig body and extends from a surface of the jig body facing the governor sheave.

2. The frictional force adjusting mechanism of an elevator governor according to claim 1.

7. A handle is provided on the other end of the jig body, on the surface opposite to the governor sheave. The frictional force adjusting mechanism for an elevator governor according to claim 6.

8. A frictional force adjusting method for adjusting the frictional force using the frictional force adjusting mechanism of the elevator governor according to claim 1, comprising: a step of engaging the engagement rod of the adjustment jig with the engagement portion through the housing through hole and the sheave through hole; adjusting the frictional force by operating the adjustment jig to rotate the ring nut; The friction force adjustment method for an elevator governor is provided.

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