Main rope tension adjustment method

Abstract

To provide a method for adjusting tension of a main rope, which can improve the workability of the tension adjustment work of the main rope. [Solution] A method for adjusting the tension of a main rope (6) comprises screwing an additional nut (27) into the portion of the threaded portion (22) of a main rope connecting rod (20) between an end (22e) of the threaded portion (22) opposite the rope socket (21) and an outer nut (24); rotating an inner nut (23) while preventing rotation of the main rope connecting rod (20) and the main rope (6) with the outer nut (24) and the additional nut (27); and locking the position of the inner nut (23) in the longitudinal direction of the threaded portion (22) using the outer nut (24).

Description

[Technical Field]

[0001] The present disclosure relates to a method for adjusting tension in a main rope. [Background technology]

[0002] When the tension of the main rope is adjusted by turning the nut on the threaded portion of the rope socket, a rotational force is applied to the rope socket. Therefore, a screwdriver is inserted into the hole of the rope socket to prevent the rope socket from rotating. This operation to prevent the rope socket from rotating may require two workers. Therefore, in Japanese Patent Laid-Open Publication No. 7-172732 (Patent Document 1), a rope socket anti-rotation jig is used to prevent the rope socket from rotating by one worker. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-172732 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because there are various types of rope sockets, there are cases where the rotation of the rope socket cannot be prevented with the rope socket anti-rotation jig disclosed in Patent Document 1. The present disclosure has been made in consideration of the above-mentioned problems, and its purpose is to provide a method for adjusting the tension of a main rope that can improve the workability of the tension adjustment work of the main rope regardless of the type of rope socket. [Means for solving the problem]

[0005] The disclosed method for adjusting tension of a main rope includes threading an additional nut onto a portion of a threaded portion of a main rope connection rod between an end of the threaded portion opposite a rope socket and an outer nut. The main rope connection rod includes a rope socket to which an end of an elevator main rope is connected and a threaded portion connected to the rope socket. An inner nut and an outer nut that locks the position of the inner nut are threaded onto the threaded portion. The outer nut is disposed between the inner nut and the end of the threaded portion in the longitudinal direction of the threaded portion. The disclosed method for adjusting tension of a main rope includes rotating the outer nut to move the outer nut toward the additional nut, and applying a first rotational force in a first direction to the outer nut and a second rotational force in a second direction opposite the first direction to the additional nut, thereby preventing rotation of the main rope connection rod and the main rope by the outer nut and the additional nut. The disclosed method for adjusting the tension of the main rope comprises adjusting the tension of the main rope by rotating the inner nut while preventing rotation of the main rope connecting rod and the main rope with the outer nut and the additional nut, and locking the position of the inner nut in the longitudinal direction of the threaded portion using the outer nut. [Effects of the Invention]

[0006] According to the method for adjusting the tension of the main rope of the present disclosure, the workability of adjusting the tension of the main rope can be improved regardless of the type of rope socket. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic side view of an elevator according to a first to third embodiments. [Figure 2] 2 is a schematic partially enlarged front view of an area II shown in FIG. 1 of the elevators according to the first to third embodiments. [Figure 3] FIG. 3 is a flowchart showing a method for adjusting the tension of the main rope according to the first embodiment. [Figure 4] FIG. 10 is a schematic partially enlarged side view showing the step of removing the split pin from the main rope connection rod in the main rope tension adjusting method according to the first to third embodiments. [Figure 5] FIG. 10 is a partially enlarged schematic side view showing the step of screwing an additional nut onto the threaded portion of the main rope connection rod in the method for adjusting the tension of the main rope according to the first to third embodiments. [Figure 6] FIG. 10 is a schematic partially enlarged side view showing a step of moving an outer nut toward an additional nut in the method for adjusting the tension of a main rope according to the first and third embodiments. [Figure 7] FIG. 10 is a schematic partially enlarged side view showing the step of preventing rotation of the main rope connection rod using an outer nut and an additional nut in the main rope tension adjusting method of the first and third embodiments. [Figure 8] FIG. 10 is a partially enlarged schematic plan view showing the step of preventing rotation of the main rope connection rod using an outer nut and an additional nut in the main rope tension adjusting method according to the first to third embodiments. [Figure 9] FIG. 10 is a partially enlarged schematic cross-sectional view showing the step of preventing rotation of the main rope connection rod using an outer nut and an additional nut in the main rope tension adjustment method according to the first to third embodiments. [Figure 10] FIG. 10 is a schematic partially enlarged side view showing a step of adjusting the tension of the main rope by rotating the inner nut in the method of adjusting the tension of the main rope according to the first and third embodiments. [Figure 11] 10 is a partially enlarged schematic side view showing a step of locking the position of an inner nut using an outer nut in the method of adjusting the tension of a main rope according to the first and third embodiments. FIG. [Figure 12] FIG. 10 is a schematic partially enlarged side view showing the step of removing an additional nut from a main rope connecting rod in the main rope tension adjusting method according to the first to third embodiments. [Figure 13] FIG. 10 is a schematic partially enlarged side view showing the step of inserting a new split pin into the main rope connection rod in the main rope tension adjusting method according to the first to third embodiments. [Figure 14] FIG. 2 is a schematic front view of an elevator according to a modification of the first to third embodiments. [Figure 15]15 is a schematic partial enlarged front view of an area XV shown in FIG. 14 in an elevator according to a modification of the first to third embodiments. FIG. [Figure 16] FIG. 10 is a flowchart showing a method for adjusting the tension of the main ropes in the second embodiment. [Figure 17] 10 is a schematic plan view of a spacer used in a main rope tension adjusting method according to a second embodiment. FIG. [Figure 18] 10 is a schematic partially enlarged side view showing a step of arranging a spacer between an outer nut and an additional nut in the method for adjusting the tension of a main rope according to a second embodiment. FIG. [Figure 19] 10 is a schematic partially enlarged side view showing a step of moving an outer nut toward an additional nut in a method for adjusting the tension of a main rope according to a second embodiment. FIG. [Figure 20] FIG. 11 is a flowchart showing a method for adjusting the tension of the main ropes in the third embodiment. [Figure 21] FIG. 11 is a schematic plan view of a plurality of additional nuts used in the method for adjusting the tension of the main rope in the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present disclosure will be described. Note that the same reference numerals are used to designate the same components, and the description thereof will not be repeated.

[0009] Embodiment 1 A method for adjusting the tension of the main rope 6 of the elevator 1 of the first embodiment will be described with reference to Figures 1 to 15. An example of the elevator 1 will be described with reference to Figures 1 and 2.

[0010] (Elevator 1 configuration) Referring to Figure 1, elevator 1 is provided with machine room 2 and hoistway 3. Machine room 2 is located above hoistway 3. Hoistway 3 includes pit 3a. Pit 3a is located at the bottom of hoistway 3, and is the portion of hoistway 3 below the landing on the lowest floor.

[0011] 1, the elevator 1 is, for example, a 1:1 roping type elevator. The elevator 1 includes, for example, a car 4, a counterweight 5, a main rope 6, a hoist 7, a deflector 9, a landing 10, and guide rails 11 and 12.

[0012] One end of the main rope 6 is connected to the car 4. The other end of the main rope 6 is connected to the counterweight 5. A plurality of main ropes 6 may be used in the elevator 1. As shown in FIG. 2, in this embodiment, for example, two main ropes 6 are used.

[0013] The hoisting machine 7 includes a sheave 8 driven by a motor (not shown). The main rope 6 is wound around the sheave 8 and a deflector sheave 9. The main rope 6 moves as the sheave 8 rotates. The car 4 moves up and down the hoistway 3 while being guided by a guide rail 11. The counterweight 5 moves up and down the hoistway 3 in the opposite direction to the car 4 while being guided by a guide rail 12.

[0014] 2, the counterweight 5 includes a frame 15, a guide shoe 16, and a weight piece 17. The frame 15 includes an upper beam 15a. The upper beam 15a is provided with a through-hole into which the threaded portion 22 of the main rope connecting rod 20 is inserted. The guide shoe 16 is fixed to the frame 15. The guide shoe 16 is slidably engaged with the guide rail 12. The weight piece 17 is disposed within the frame 15.

[0015] In the elevator 1 shown in FIG. 1, the main rope connection rod 20 is connected to a first end of the main rope 6 connected to the car 4 and a second end of the main rope 6 connected to the counterweight 5. The main rope connection rod 20 (not shown) connected to the first end of the main rope 6 is configured similarly to the main rope connection rod 20 (see FIG. 2) connected to the second end of the main rope 6. Hereinafter, the main rope connection rod 20 connected to the second end of the main rope 6 will be described as an example with reference to FIG. 2.

[0016] The main rope connection rod 20 includes a rope socket 21 and a threaded portion 22. The rope socket 21 is connected to a second end of the main rope 6 of the elevator 1. The threaded portion 22 is connected to the rope socket 21. The rope socket 21 and the threaded portion 22 may be formed integrally, or may be mechanically connected to each other using a connecting pin or the like. The threaded portion 22 is inserted into a through-hole provided in the upper beam 15a from above the upper beam 15a.

[0017] The inner nut 23 and the outer nut 24 are screwed onto the threaded portion 22 from below the upper beam 15a. In the longitudinal direction of the threaded portion 22, the inner nut 23 is disposed between the rope socket 21 and the outer nut 24. In the longitudinal direction of the threaded portion 22, the outer nut 24 is disposed between the inner nut 23 and the end 22e of the threaded portion 22. In the longitudinal direction of the threaded portion 22, the outer nut 24 is disposed between the inner nut 23 and the split pin 25. The tension of the main rope 6 is adjusted by adjusting the position of the inner nut 23 in the longitudinal direction of the threaded portion 22. For example, tightening the inner nut 23 increases the tension of the main rope 6, and loosening the inner nut 23 decreases the tension of the main rope 6. The outer nut 24 prevents the inner nut 23 from loosening. The outer nut 24 prevents the inner nut 23 from rotating around the threaded portion 22, locking the position of the inner nut 23 in the longitudinal direction of the threaded portion 22.

[0018] A split pin 25 is inserted into an end 22e of the threaded portion 22 opposite to the rope socket 21. The split pin 25 prevents the inner nut 23 and the outer nut 24 from falling off the threaded portion 22.

[0019] The tension of the main ropes 6 is adjusted periodically. Specifically, an operator loosens the outer nut 24. The operator rotates the inner nut 23 to adjust the tension of the main ropes 6 to within a specified range. The operator tightens the outer nut 24 to prevent the inner nut 23 from rotating and to lock the position of the inner nut 23. In this way, the tension of the main ropes 6 is adjusted. When the inner nut 23 is rotated to adjust the tension of the main ropes 6, the main rope connecting rod 20 and the main ropes 6 may rotate together with the inner nut 23. Therefore, when rotating the inner nut 23, it is necessary to adjust the tension of the main ropes using the inner nut 23 while preventing the main rope connecting rod 20 and the main ropes 6 from rotating.

[0020] (How to adjust the tension of the main rope 6) A method for adjusting the tension of the main ropes 6 in this embodiment will be described with reference to FIGS.

[0021] 3 and 4, the split pin 25 inserted into the end 22e of the threaded portion 22 of the main rope connection rod 20 is removed from the threaded portion 22 (step S1). The main rope connection rod 20 includes a rope socket 21 and a threaded portion 22. A second end of the main rope 6 of the elevator 1 is connected to the rope socket 21. The threaded portion 22 is connected to the rope socket 21. An inner nut 23 and an outer nut 24 are screwed onto the threaded portion 22. In the longitudinal direction of the threaded portion 22, the outer nut 24 is disposed between the inner nut 23 and the end 22e of the threaded portion 22. A split pin 25 is inserted into the end 22e of the threaded portion 22. The split pin 25 is inserted into a hole provided in the threaded portion 22. In step S1, the split pin 25 is pulled out from the hole provided in the end 22e of the threaded portion 22.

[0022] 3 and 5, the additional nut 27 is screwed onto a portion of the threaded portion 22 between the end 22e of the threaded portion 22 and the outer nut 24 (step S2). Specifically, the additional nut 27 is inserted from the end 22e of the threaded portion 22 and screwed onto the threaded portion 22. In the longitudinal direction of the threaded portion 22, the additional nut 27 is disposed on the opposite side of the outer nut 24 from the inner nut 23. In the longitudinal direction of the threaded portion 22, the outer nut 24 is disposed between the inner nut 23 and the additional nut 27. The additional nut 27 is rotated using a first tool 30 to move the additional nut 27 toward the outer nut 24. The first tool 30 is, for example, a wrench.

[0023] 3 and 6, the outer nut 24 is rotated to move it toward the additional nut 27 (step S3). For example, while using the third tool 32 to prevent the inner nut 23 from rotating, the outer nut 24 is rotated using the second tool 31 to loosen the outer nut 24. The outer nut 24 is further rotated using the second tool 31 to move the outer nut 24 until it comes into contact with the additional nut 27. The second tool 31 and the third tool 32 are, for example, wrenches.

[0024] 3, 7, and 8, the outer nut 24 and the additional nut 27 prevent rotation of the main rope connection rod 20 and the main rope 6 (step S4). For example, an operator holds the first tool 30 and the second tool 31 in one hand, and applies a first rotational force in a first direction to the outer nut 24 using the second tool 31, and applies a second rotational force in a second direction opposite to the first direction to the additional nut 27 using the first tool 30. The outer nut 24 and the additional nut 27 are tightened. The outer nut 24 and the additional nut 27 form a double-nut structure. The outer nut 24 and the additional nut 27 prevent rotation of the main rope connection rod 20 and the main rope 6.

[0025] 9, the threaded portion 22 has a first inclined surface 22a and a second inclined surface 22b opposing the first inclined surface 22a. When a first rotational force is applied to the outer nut 24, the inclined surface of the thread of the outer nut 24 is pressed by the first inclined surface 22a of the threaded portion 22. When a second rotational force is applied to the additional nut 27, the inclined surface of the thread of the additional nut 27 is pressed by the second inclined surface 22b of the threaded portion 22 opposing the first inclined surface 22a. When the outer nut 24 and the additional nut 27 are threaded onto the threaded portion 22, the first inclined surface 22a faces in the longitudinal direction of the threaded portion 22, in a direction from the outer nut 24 to the additional nut 27, and the second inclined surface 22b faces in the longitudinal direction of the threaded portion 22, in a direction from the additional nut 27 to the outer nut 24.

[0026] Therefore, by applying a first rotational force in a first direction to the outer nut 24 using the second tool 31 and applying a second rotational force in a second direction opposite to the first direction to the additional nut 27 using the first tool 30, the additional nut 27 and the outer nut 24 are pressed against each other in the longitudinal direction of the threaded portion 22. The main rope connection rod 20 is tightened by the outer nut 24 and the additional nut 27 forming a double nut structure, and rotation of the main rope connection rod 20 and the main rope 6 is prevented.

[0027] 3 and 10 , the tension of the main rope 6 is adjusted by rotating the inner nut 23 while preventing rotation of the main rope connection rod 20 and the main rope 6 using the outer nut 24 and the additional nut 27 (step S5). For example, the worker holds the first tool 30 and the second tool 31 with one hand and applies a first rotational force in a first direction to the outer nut 24 using the second tool 31, and applies a second rotational force in a second direction opposite to the first direction to the additional nut 27 using the first tool 30. Rotation of the main rope connection rod 20 and the main rope 6 is prevented. The worker holds the third tool 32 with the other hand and uses the third tool 32 to rotate the inner nut 23. The inner nut 23 moves in the longitudinal direction of the threaded portion 22. As a result, the tension of the main rope 6 is appropriately adjusted. Because one worker can operate the first tool 30, the second tool 31, and the third tool 32, one worker can adjust the tension of the main rope 6.

[0028] 3 and 11, the outer nut 24 is used to lock the position of the inner nut 23 in the longitudinal direction of the threaded portion 22 (step S6). Specifically, while using the first tool 30 to prevent rotation of the additional nut 27, the outer nut 24 is rotated using the second tool 31. The outer nut 24 loosens. The outer nut 24 is further rotated using the second tool 31. The outer nut 24 moves toward the inner nut 23 and comes into contact with it. While using the third tool 32 to prevent rotation of the inner nut 23, the outer nut 24 is further tightened using the second tool 31. In this way, the outer nut 24 prevents rotation and loosening of the inner nut 23, locking the position of the inner nut 23. An appropriate tension is maintained in the main rope 6.

[0029] 3 and 12, the additional nut 27 is removed from the main rope connection rod 20 (step S7). For example, the additional nut 27 is rotated using the first tool 30 to move the additional nut 27 toward the end 22e of the threaded portion 22. Note that step S7 may be omitted so that the additional nut 27 can be used for the next tension adjustment work of the main rope 6.

[0030] 3 and 13, a new split pin 25 is inserted into the end 22e of the threaded portion 22 of the main rope connection rod 20 (step S8). Specifically, the split pin 25 is inserted into the hole provided in the end 22e of the threaded portion 22. In this way, the tension adjustment work for the main ropes 6 is completed.

[0031] The elevator 1 to which the method for adjusting the tension of the main rope 6 of this embodiment is applied is not limited to the elevator 1 shown in Figures 1 and 2, but may also be, for example, an elevator 1 as shown in Figures 14 and 15.

[0032] 14, the elevator 1 is an elevator 1 (machine room-less elevator 1) that is not provided with a machine room 2. The elevator 1 shown in FIG. 14 is configured similarly to the elevator 1 shown in FIG. 1, but further includes pulleys 51 and 52, deflector pulleys 53 and 54, and a support plate 55.

[0033] The hoisting machine 7 is disposed at the bottom of the hoistway 3. The pulley 51 is provided at the bottom of the car 4. The pulley 52 is provided at the top of the counterweight 5. The deflector sheave 53 is disposed between the pulley 51 and the hoisting machine 7 and at the top of the hoistway 3. The deflector sheave 54 is disposed between the hoisting machine 7 and the pulley 52 and at the top of the hoistway 3. The main rope 6 is guided by the pulleys 51, 52, the deflector sheaves 53, 54 and the sheave 8 of the hoisting machine 7.

[0034] 14 and 15, both ends of the main rope 6 are connected to the rope sockets 21 of the main rope connecting rod 20. A support plate 55 and a spring bearing 57 are fixed to the building in which the elevator 1 is installed. Through holes are provided in the support plate 55 and the spring bearing 57. The spring bearing 57 is disposed above the support plate 55. A coil spring 56 is disposed between the support plate 55 and the spring bearing 57.

[0035] The threaded portion 22 of the main rope connection rod 20 is inserted into the through-hole of the support plate 55 and the through-holes of the coil spring 56 and spring holder 57. An inner nut 23 and an outer nut 24 are screwed onto the part of the threaded portion 22 that protrudes from the spring holder 57. A split pin 25 is inserted into the end 22e of the threaded portion 22 on the side opposite to the rope socket 21.

[0036] The effect of the method for adjusting the tension of the main ropes 6 according to this embodiment will be described.

[0037] The method for adjusting the tension of the main ropes 6 in this embodiment includes screwing an additional nut 27 into a portion of the threaded portion 22 of the main rope connection rod 20 between the end 22e of the threaded portion 22 opposite the rope socket 21 and the outer nut 24 (step S2). The main rope connection rod 20 includes a rope socket 21 to which an end of the main rope 6 of the elevator 1 is connected, and a threaded portion 22 connected to the rope socket 21. An inner nut 23 and an outer nut 24 that locks the position of the inner nut 23 are screwed onto the threaded portion 22. In the longitudinal direction of the threaded portion 22, the outer nut 24 is arranged between the inner nut 23 and the end 22e of the threaded portion 22. The method for adjusting the tension of the main ropes 6 in this embodiment includes rotating the outer nut 24 to move it toward the additional nut 27 (step S3), and applying a first rotational force in a first direction to the outer nut 24 and a second rotational force in a second direction opposite to the first direction to the additional nut 27, thereby preventing rotation of the main rope connection rod 20 and the main ropes 6 with the outer nut 24 and the additional nut 27 (step S4).The method for adjusting the tension of the main ropes 6 in this embodiment includes rotating the inner nut 23 to adjust the tension of the main ropes 6 while preventing rotation of the main rope connection rod 20 and the main ropes 6 with the outer nut 24 and the additional nut 27 (step S5), and locking the position of the inner nut 23 in the longitudinal direction of the threaded portion 22 using the outer nut 24 (step S6).

[0038] While the inner nut 23 is rotated to adjust the tension of the main rope 6, the main rope connection rod 20 is tightened by the outer nut 24 and the additional nut 27, which form a double-nut structure, to prevent rotation of the main rope connection rod 20 and the main rope 6. Therefore, the process of preventing rotation of the main rope connection rod 20 and the main rope 6 can be performed independently of the rope socket 21. Furthermore, the worker can operate the first tool 30 and the second tool 31 with one hand to prevent rotation of the main rope connection rod 20 and the main rope 6 using the outer nut 24 and the additional nut 27. The worker can operate the third tool 32 with the other hand to rotate the inner nut 23 and adjust the tension of the main rope 6. In other words, the tension adjustment of the main rope 6 can be performed by a single worker. This improves the operability of the tension adjustment of the main rope 6 regardless of the type of rope socket 21.

[0039] The method for adjusting the tension of the main rope 6 in this embodiment further includes removing the split pin 25 inserted into the end 22e of the threaded portion 22 from the threaded portion 22 (step S1), and inserting a new split pin 25 into the end 22e of the threaded portion 22 (step S8).

[0040] By removing the split pin 25 from the threaded portion 22 in advance, it becomes possible to screw the additional nut 27 into the portion of the threaded portion 22 between the end 22e of the threaded portion 22 and the outer nut 24. The worker can operate the first tool 30 and the second tool 31 with one hand to prevent rotation of the main rope connection rod 20 and the main rope 6 using the outer nut 24 and the additional nut 27. The worker can operate the third tool 32 with the other hand to rotate the inner nut 23 and adjust the tension of the main rope 6. In other words, one worker can adjust the tension of the main rope 6. The workability of adjusting the tension of the main rope 6 can be improved.

[0041] Embodiment 2 A method for adjusting the tension of the main ropes 6 of the second embodiment will be described with reference to Figures 1, 2, 4, 5, 8, 9, 13, and 16 to 19. The method for adjusting the tension of the main ropes 6 of the present embodiment comprises the same steps as the method for adjusting the tension of the main ropes 6 of the first embodiment, but differs from the method for adjusting the tension of the main ropes 6 of the first embodiment mainly in the following points.

[0042] With reference to Fig. 16, the method for adjusting the tension of the main rope 6 in this embodiment further includes, between step S2 and step S3, placing a spacer 40 between the additional nut 27 and the outer nut 24 (step S9). With reference to Figs. 17 and 18, the spacer 40 is, for example, a split sleeve, and a slit 41 is provided in the spacer 40. The slit 41 is forced open, and the spacer 40 is attached to the portion of the threaded portion 22 between the additional nut 27 and the outer nut 24. The spacer 40 is in contact with the additional nut 27.

[0043] 16 and 19, in step S3, the second tool 31 is used to rotate the outer nut 24, and the outer nut 24 is moved until it contacts the spacer 40. The spacer 60 widens the gap between the outer nut 24 and the pair of split nuts 45. As a result, in steps S4 and S5, the gap between the first tool 30 and the second tool 31 widens. Referring to FIG. 16, in step S7, the additional nut 27 and the spacer 40 are removed from the main rope connection rod 20. Note that step S7 may be omitted because the additional nut 27 and the spacer 40 can be used for the next tension adjustment work of the main rope 6.

[0044] The method for adjusting the tension of the main ropes 6 of this embodiment has the following effects in addition to the effects of the method for adjusting the tension of the main ropes 6 of the first embodiment.

[0045] The method for adjusting the tension of the main ropes 6 in this embodiment further includes arranging a spacer 40 between the additional nut 27 and the outer nut 24 (step S9).

[0046] Therefore, when the first tool 30 and the second tool 31 are used to prevent rotation of the main rope connecting rod 20 and the main rope 6 with the outer nut 24 and the additional nut 27, mechanical interference between the first tool 30 and the second tool 31 can be prevented. Also, the distance between the first tool 30 and the second tool 31 can be adjusted to a distance that makes it easy for the worker to grasp the first tool 30 and the second tool 31 with one hand. This improves the workability of adjusting the tension of the main rope 6.

[0047] Embodiment 3 A method for adjusting the tension of the main ropes 6 according to the third embodiment will be described with reference to Figures 1, 2, 4 to 15, 20 and 21. The method for adjusting the tension of the main ropes 6 according to the present embodiment comprises the same steps as the method for adjusting the tension of the main ropes 6 according to the first embodiment, but differs from the method for adjusting the tension of the main ropes 6 according to the first embodiment mainly in the following points.

[0048] The method for adjusting the tension of the main rope 6 in this embodiment further includes selecting an additional nut 27 having an inner diameter suitable for the diameter of the threaded portion 22 of the main rope connection rod 20 from a plurality of additional nuts 27p (see Figure 21) having different inner diameters (step S10).

[0049] The diameter of the threaded portion 22 of the main rope connection rod 20 may differ depending on the model of the elevator 1. Therefore, an additional nut 27 having an inner diameter suitable for the diameter of the threaded portion 22 of the main rope connection rod 20 is selected from a plurality of additional nuts 27p. The selected additional nut 27 is screwed onto the threaded portion 22. In this way, the method for adjusting the tension of the main rope 6 of this embodiment can be applied to the tension adjustment work of the main rope 6 of a plurality of models of elevator 1. The workability of the tension adjustment work of the main rope 6 can be improved.

[0050] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) an additional nut is screwed onto a portion of the threaded portion of the main rope connection rod between an end of the threaded portion opposite to the rope socket and an outer nut, wherein the main rope connection rod includes the rope socket to which an end of an elevator main rope is connected and the threaded portion connected to the rope socket, an inner nut and an outer nut that locks the position of the inner nut are screwed onto the threaded portion, and the outer nut is disposed between the inner nut and the end of the threaded portion in the longitudinal direction of the threaded portion, Rotating the outer nut to move the outer nut toward the additional nut; applying a first rotational force in a first direction to the outer nut and a second rotational force in a second direction opposite to the first direction to the additional nut, thereby preventing rotation of the main rope connection rod and the main rope by the outer nut and the additional nut; Rotating the inner nut to adjust the tension of the main rope while preventing the rotation of the main rope connecting rod and the main rope by the outer nut and the additional nut; and locking the position of the inner nut in the longitudinal direction of the threaded portion using the outer nut. (Appendix 2) removing a split pin inserted into the end of the threaded portion from the threaded portion; and inserting a new split pin into the end of the threaded portion. (Appendix 3) 3. The method for adjusting the tension of a main rope according to claim 1 or 2, further comprising disposing a spacer between the additional nut and the outer nut. (Appendix 4) 4. The method for adjusting the tension of a main rope according to any one of Supplementary Note 1 to Supplementary Note 3, further comprising selecting an additional nut having an inner diameter suitable for the diameter of the threaded portion from a plurality of additional nuts having mutually different inner diameters.

[0051] The presently disclosed embodiments 1-3 and their modifications should be considered to be illustrative in all respects and not restrictive. Unless inconsistent, at least two of the presently disclosed embodiments 1-3 and their modifications may be combined. The scope of the present disclosure is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0052] 1 elevator, 2 machine room, 3 hoistway, 3a pit, 4 car, 5 counterweight, 6 main rope, 7 hoist, 8 sheave, 9, 53, 54 deflector, 10 landing, 11, 12 guide rail, 15 frame, 15a upper beam, 16 guide shoe, 17 weight piece, 20 main rope connecting rod, 21 rope socket, 22 threaded portion, 22a first inclined surface, 22b second inclined surface, 22e end, 23 inner nut, 24 outer nut, 25 split pin, 27 additional nut, 27p multiple additional nuts, 30 first tool, 31 second tool, 32 third tool, 40 spacer, 41 slit, 51, 52 pulley, 55 support plate, 56 coil spring.

Claims

1. an additional nut is screwed onto a portion of the threaded portion of the main rope connection rod between an end of the threaded portion opposite to the rope socket and an outer nut, wherein the main rope connection rod includes the rope socket to which an end of an elevator main rope is connected and the threaded portion connected to the rope socket, an inner nut and an outer nut that locks the position of the inner nut are screwed onto the threaded portion, and the outer nut is disposed between the inner nut and the end of the threaded portion in the longitudinal direction of the threaded portion, Rotating the outer nut to move the outer nut toward the additional nut; applying a first rotational force in a first direction to the outer nut and a second rotational force in a second direction opposite to the first direction to the additional nut, thereby preventing rotation of the main rope connection rod and the main rope by the outer nut and the additional nut; Rotating the inner nut to adjust the tension of the main rope while preventing the rotation of the main rope connecting rod and the main rope with the outer nut and the additional nut; and locking the position of the inner nut in the longitudinal direction of the threaded portion using the outer nut.

2. removing a split pin inserted into the end of the threaded portion from the threaded portion; 2. The method of claim 1 further comprising inserting a new split pin into said end of said threaded portion.

3. 3. The method for adjusting the tension of a main rope according to claim 1 or claim 2, further comprising disposing a spacer between the additional nut and the outer nut.

4. 3. The method for adjusting the tension of a main rope according to claim 1 or 2, further comprising selecting an additional nut having an inner diameter suitable for the diameter of the threaded portion from a plurality of additional nuts having mutually different inner diameters.

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