Rope length adjustment jig and rope length adjustment method for the main rope used for raising and lowering the elevator car

Abstract

To provide a rope length adjustment jig for a main rope for lifting and lowering cars which can reduce the burden on workers and shorten the time required to adjust the rope length.SOLUTION: A rope length adjustment jig 32 is inserted between an inner nut 12 and an outer nut 13, and comprises an opening 35 that removably engages with a threaded rod 7, a receiving plate 33 having a plurality of through holes provided around the opening 35, a plurality of adjustment bolts 40 that pass through each through hole and whose tips are pressed against a rope base 2b, and adjustment nuts 44 into which the plurality of adjustment bolts 40 are screwed and which adjusts the protrusion length of the adjustment bolts 40. The distance between the rope base 2b and the receiving plate 33 is increased by tightening each adjustment bolt 40 into each adjustment nut 44.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rope length adjusting tool and a rope length adjusting method for a main rope for hoisting a car, and particularly relates to easily adjusting the rope length of the main rope individually.

Background Art

[0002] FIG. 11 shows a conventional rope length adjusting method for the main rope 3. FIG. 12 is an enlarged perspective view of the connection portion between the main rope 3 and the counterweight 2. In an elevator, for example, as shown in FIGS. 11 and 12, there is an elevator in which a car 1 and a counterweight 2 are connected by a plurality of main ropes 3, and the car 1 moves up and down by the drive of a hoisting machine 6 in a machine room 4. In FIG. 11, for convenience of explanation, only one main rope 3 is shown, but actually, as shown in FIG. 12, there are a plurality of main ropes 3. In such an elevator, elongation may occur in some of the main ropes 3 due to long-term use. In this case, since some of the main ropes 3 become slack, the tension based on the load from the car 1 or the counterweight 2 acts concentratedly on the other main ropes 3, so the tension of the other main ropes 3 may become excessive. As a result, a rope length adjustment operation for the main rope 3 is required to adjust the load acting positions of some of the main ropes 3 so that the tension is evenly applied to all the main ropes 3.

[0003] In this type of elevator, as shown in Figure 12, a threaded rod 7, provided at one free end on the counterweight 2 side of each main rope 3, is inserted from above into a rope base 2b provided at the upper end of the frame member 2a that constitutes the counterweight 2. A nut 8 is attached to the portion of each threaded rod 7 that protrudes downward from the rope base 2b. The length of the protrusion of each threaded rod 7 downward from the rope base 2b determines the load application position of each main rope 3. In conventional rope length adjustment work, the rope length is adjusted by the worker 10 (Figure 11) rotating the nut 8 attached to the threaded rod 7, thereby adjusting the protrusion length of the main rope 3 from the rope base 2b. The frame member 2a has the counterweight body 2c fixed to its inside, and the vertical movement of the frame member 2a is guided by a guide rail 82 provided along the vertical direction of the hoistway 80.

[0004] Figure 13 shows an example of a conventional method for adjusting the length of the main rope 3 at the connection point between the main rope 3 and the counterweight 2 in Figure 12. In the conventional method shown in Figure 13, the main rope 3 and the threaded rod 7 are connected by an eyebolt-type connector 9. In the conventional method of adjusting the rope length, a rod-shaped rotation-preventing member 11 is inserted into the ring portion of the connector 9 to suppress the rotation of the threaded rod 7, and the rope length is adjusted by rotating the inner nut 12 corresponding to the nut 8 (Figure 12) mentioned above. An outer nut 13 is fixed adjacent to the inner nut 12 on the threaded rod 7 of the main rope 3 to prevent the inner nut 12 from loosening.

[0005] Figure 14 is a schematic diagram showing the configuration of another elevator. As shown in Figure 14, the movement of the main rope 3 is guided by a pulley 21 below the elevator car 1 and a pulley 23 installed above the counterweight 22, and the main rope 20 is moved longitudinally by the drive of a hoisting machine 24 installed above, thereby raising and lowering the elevator car 1 and the counterweight 22.

[0006] Figure 15 is a diagram showing an example of a conventional method for adjusting the length of the main rope 20, in an enlarged view of section A in Figure 14. In the conventional method shown in Figure 15, a threaded rod 25 provided at the free end of the main rope 20 is passed through a support plate 26 fixed horizontally to the top of the building and a spring receiving plate 28 above it, and an inner nut 29 is fixed to the portion protruding from the spring receiving plate 28. A coil spring 27 is provided around the threaded rod 25 between the support plate 26 and the spring receiving plate 28. In this configuration, the length of the main rope 20 is adjusted by rotating the inner nut 29. An outer nut 30 is also fixed to the threaded rod 25 adjacent to the inner nut 29 to prevent the inner nut 29 from loosening.

[0007] Patent Document 1 describes a device for adjusting the lengths of multiple main ropes in the above-described elevator. In the device described in Patent Document 1, threaded rods provided on multiple main ropes protrude upward from a support plate, and springs are provided around the protruding portion of each threaded rod. A first nut is fixed to the upper end of the spring on the threaded rod to restrict the upward movement of the spring. Furthermore, the protruding portion of each threaded rod is passed through a jack plate, and a second nut is fixed to the upper side of the passing portion to restrict downward movement. In addition, a bolt is screw-connected from above to the jack plate at a position separate from the threaded rod, and the tip of the bolt is abutted against the support plate. By further tightening the bolt, the distance between the jack plate and the support plate can be widened. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2016-55953 [Overview of the project] [Problems that the invention aims to solve]

[0009] In the elevator of the type shown in Figure 12, when adjusting the rope length by rotating a nut 8 connected to a threaded rod 7, the threaded rod 7 rotates in the same direction as the nut 8, so it is necessary to tighten the nut 8 while suppressing the rotation of the threaded rod 7. The threaded rod 7 and nut 8 are large in diameter, and the threaded rod 7 does not have a head for rotation suppression like a bolt, making it difficult to suppress rotation. For this reason, as shown in Figure 13 above, a rotation suppression member 11 is sometimes inserted into the eyebolt-type connection part 9 that connects the main rope 3 and the threaded rod 7 to suppress its rotation, while the inner nut 12 and outer nut 13 are rotated. However, even in that case, it is necessary to suppress rotation and rotate the inner nut 12 or outer nut 13 simultaneously. Furthermore, as shown in Figure 11, this work is performed by a worker 10 on an unstable elevator car 1. As a result, the burden on the worker 10 is great, and the work time is long. On the other hand, there are cases where multiple workers perform tasks such as rotating the nut and preventing the screw rod from rotating, but working in a confined space such as on top of a train car still places a heavy burden on the workers.

[0010] Furthermore, in elevators of the type shown in Figures 14 and 15, when the protruding length of the main rope is adjusted by rotating the internal nut 29 connected to the upper side of the spring support plate 28, the work time is long because it places a heavy burden on the worker performing the adjustment, similar to the configuration in Figure 13.

[0011] On the other hand, in the configuration described in Patent Document 1, it is possible to widen the gap between the jack plate and the support plate by tightening a bolt that passes through the jack plate and pressing the tip of the bolt against the upper surface of the support plate. However, in this configuration, in order to adjust the rope length of some of the main ropes, the gap between the support plate and the jack plate is also widened for other main ropes whose rope length does not need to be adjusted, which changes the extension of the spring. As a result, it is not possible to adjust the rope length of some of the main ropes individually and independently. In addition, since it is necessary to remove the nuts from multiple threaded rods and then remove the jack plate from multiple threaded rods, the removal work is troublesome.

[0012] The objective of the present invention is to reduce the burden on workers and shorten the time required for rope length adjustment by enabling easy individual adjustment of the rope length of the main rope and facilitating the removal of the jig from the threaded rod attached to the main rope. [Means for solving the problem]

[0013] The first rope length adjustment jig for elevator car lifting and lowering main ropes according to the present invention is a rope length adjustment jig for elevator car lifting and lowering main ropes, characterized in that the load application position of each main rope is determined by the protrusion length of threaded rods provided at the free ends of a plurality of main ropes from the rope base, the protrusion length of the threaded rods from the rope base is determined by fixing an inner nut for each main rope, and the position of the inner nut is fixed by an outer nut for preventing loosening, and comprises a receiving plate having an opening inserted between the inner nut and the outer nut and detachably engaging with the threaded rod and a plurality of through holes provided around the opening, a plurality of adjustment bolts passing through each of the through holes and having their tips pressed against the rope base, and an adjustment nut into which the plurality of adjustment bolts are screwed and which adjusts the protrusion length of the adjustment bolts, and the distance between the rope base and the receiving plate is widened by tightening each of the adjustment bolts into each of the adjustment nuts.

[0014] According to the first rope length adjustment jig of the present invention, each adjustment bolt is smaller in diameter than the threaded rod, and the distance between the rope base and the receiving plate can be widened by rotating the adjustment bolt relative to the small-diameter adjustment nut corresponding to each adjustment bolt. As a result, one worker can easily rotate the adjustment bolt and adjustment nut relative to each other without requiring great force, so the rope length of the main rope can be easily adjusted individually. Furthermore, when pressing the inner nut against the rope base after adjusting the protruding length of the threaded rod, no large load is applied to the inner nut from the rope base, so the worker does not need to exert great force when tightening the inner nut. In addition, the threaded rod does not rotate along with the inner nut when tightening the inner nut. Moreover, the receiving plate can be easily positioned between the inner nut and the outer nut by fitting it onto the threaded rod from the opening end of the receiving plate and engaging it with the main rope, and it is not necessary to remove the outer nut from the threaded rod when positioning it. Furthermore, since it is easy to remove the receiving plate from the threaded rod, the removal of the jig can be made easier. This reduces the burden on the worker and shortens the time required for rope length adjustment.

[0015] Furthermore, in the first rope length adjustment jig according to the present invention, the adjustment nut may be fixed to the receiving plate.

[0016] With the above configuration, the worker does not need to hold the adjustment nut and the receiving plate separately by hand while working. Furthermore, when tightening the adjustment bolt or rotating it in the loosening direction against the adjustment nut, it is not necessary to hold the adjustment nut in place to prevent it from rotating. This makes the rope length adjustment process significantly easier. As a result, the time required for rope length adjustment can be significantly reduced.

[0017] Furthermore, the second rope length adjustment jig for the main ropes used for elevator car ascent and descent according to the present invention is a rope length adjustment jig for the main ropes used for elevator car ascent and descent in which the load application position of each main rope is determined by the protrusion length of threaded rods provided at the free ends of a plurality of main ropes from the rope base, the protrusion length of the threaded rods from the rope base is determined for each main rope by fixing an inner nut, and the position of the inner nut is fixed by an outer nut for preventing loosening, and comprises a receiving plate having an opening inserted between the inner nut and the outer nut and detachably engaging with the threaded rod, and a plurality of screw holes provided around the opening, and a plurality of adjustment bolts screw-connected to each of the screw holes of the receiving plate, with their tips pressed against the rope base, and is characterized in that the distance between the rope base and the receiving plate is widened by tightening each of the adjustment bolts into each of the screw holes.

[0018] According to the second rope length adjustment jig of the present invention, each adjustment bolt is made smaller in diameter than the threaded rod, and the distance between the rope base and the receiving plate can be widened by rotating the adjustment bolt in the corresponding small-diameter threaded hole. This allows for easy individual adjustment of the rope length of the main rope. Furthermore, when pressing the inner nut against the rope base after adjusting the protruding length of the threaded rod, the worker does not need to exert much force. Also, the threaded rod does not rotate along with the inner nut when tightening it. Moreover, the receiving plate can be easily positioned between the inner nut and the outer nut of the threaded rod, and there is no need to remove the outer nut from the threaded rod when positioning it. Furthermore, since it is easy to remove the receiving plate from the threaded rod, the removal of the jig can be made easier. This reduces the burden on the worker and shortens the time required for rope length adjustment. In addition, since it is not necessary to screw the adjustment bolt into an adjustment nut that is separate from the receiving plate, the number of parts can be reduced, and the worker does not need to hold the adjustment nut or hold it in place to prevent it from rotating. This reduces the cost of rope length adjustment jigs and significantly simplifies the rope length adjustment process. As a result, the time required for rope length adjustment can be drastically reduced.

[0019] Furthermore, in the first or second rope length adjustment jig according to the present invention, the second receiving plate may be configured to be inserted between the inner nut and the outer nut so as to overlap the receiving plate, detachably engage with the threaded rod, and have a second opening that opens in the opposite direction to the opening, and a plurality of through holes through which the plurality of adjustment bolts pass.

[0020] With the above configuration, the two receiving plates remain overlapped with two adjustment bolts passing through them, preventing the threaded rods from coming out of the openings in each receiving plate. This more reliably prevents the receiving plates from detaching from the main rope even if the main rope shakes during rope length adjustment.

[0021] Furthermore, the rope length adjustment method for the main rope used for ascending and descending an elevator car according to the present invention is a rope length adjustment method using the first or second rope length adjustment jig according to the present invention, wherein the outer nut is pressed against the side surface of the receiving plate, the tips of the plurality of adjustment bolts are brought against the side surface of the rope base, and each adjustment bolt is further tightened into each adjustment nut or each screw hole to widen the gap between the rope base and the receiving plate, the inner nut is tightened into the screw rod so as to press it against the side surface of the rope base, and then the receiving plate is removed from between the inner nut and the outer nut, thereby adjusting the rope length of the main rope used for ascending and descending an elevator car.

[0022] According to the rope length adjustment method of the present invention, each adjustment bolt has a smaller diameter than the threaded rod, and the distance between the rope pedestal and the receiving plate can be increased by rotating the adjustment bolt with respect to the adjustment nut or threaded hole having the corresponding smaller diameter. Thereby, one operator can easily perform the relative rotation between the adjustment bolt and the adjustment nut or the threaded hole without requiring a large force, so that the rope length of the main rope can be easily adjusted individually. Further, when removing the receiving plate from between the inner nut and the outer nut after the adjustment operation, since the inner nut is pressed against the side surface of the rope pedestal, a large force is not applied to the receiving plate and the adjustment bolt from the rope pedestal, and the receiving plate can be easily removed. Therefore, the burden on the operator can be reduced and the adjustment operation time of the rope length can be shortened.

Effect of the Invention

[0023] According to the rope length adjusting tool and the rope length adjustment method for the main rope for hoist movement of the present invention, the rope length of the main rope can be easily adjusted individually, and the removal of the tool from the threaded rod provided on the main rope can be facilitated. Thereby, the burden on the operator can be reduced and the adjustment operation time of the rope length can be shortened.

Brief Description of the Drawings

[0024] [Figure 1] It is a figure which shows the state which adjusts the rope length of a main rope using the rope length adjusting tool of embodiment which concerns on this invention. [Figure 2] It is an enlarged view which takes out and shows a rope length adjusting tool from FIG. 1. [Figure 3] It is a perspective view seen from the lower side of FIG. 2 in the state just before passing an adjustment bolt through two receiving plates and coupling it to an adjustment nut. [Figure 4A] In the first type of elevator, it is a figure which shows the state before adjustment (a) and the first step (b) of the rope length adjustment method using the rope length adjusting tool of FIG. 2. [Figure 4B] It is a sectional view taken along line B - B of FIG. 4A(b). [Figure 4C]This figure shows the second step (a) and third step (b) of the rope length adjustment method using the rope length adjustment jig shown in Figure 4A. [Figure 4D] Figures 4A and 4C show the fourth (a) and fifth (b) steps of the rope length adjustment method using the rope length adjustment jig. [Figure 5] This is an exploded view of a rope length adjustment jig, which is another embodiment of the present invention. [Figure 6] This is an exploded view of a rope length adjustment jig, which is another embodiment of the present invention. [Figure 7A] Figure 6 shows the rope length adjustment method using the rope length adjustment jig, specifically the state before adjustment (a) and the first step (b). [Figure 7B] This figure shows the second step (a) and third step (b) of the rope length adjustment method using the rope length adjustment jig shown in Figure 6. [Figure 7C] This figure shows the fourth step (a) and fifth step (b) of the rope length adjustment method using the rope length adjustment jig shown in Figure 6. [Figure 8A] This figure shows a receiving plate in another embodiment. [Figure 8B] This figure shows a receiving plate in another embodiment. [Figure 9] This figure shows the process of adjusting the rope length of a main rope in a different example using the rope length adjustment jig shown in Figure 2. [Figure 10] This figure shows the rope length being adjusted using the rope length adjustment jig shown in Figure 2. [Figure 11] This diagram shows a conventional method for adjusting the length of the main rope. [Figure 12] This is an enlarged perspective view of the connection point between the main rope and the counterweight. [Figure 13] Figure 12 shows an example of a conventional method for adjusting the rope length of the main rope at the connection point. [Figure 14] This is a schematic diagram showing the configuration of other types of elevators. [Figure 15] Figure 14, enlarged view of section A, shows an example of a conventional method for adjusting the length of the main rope. [Modes for carrying out the invention]

[0025] The rope length adjustment jig and rope length adjustment method according to embodiments of the present invention will be described below with reference to the drawings. The shapes, materials, numbers, etc. described below are illustrative examples for illustrative purposes and can be appropriately changed according to the specifications of the elevator. In all drawings below, equivalent elements will be denoted by the same reference numerals.

[0026] Figure 1 shows the rope length adjustment of the main rope 3 using the rope length adjustment jig 32 of the embodiment. Figure 2 is an enlarged view of Figure 1, showing the rope length adjustment jig 32 removed from the original.

[0027] The basic configuration of the elevator is the same as that of the elevators shown in Figures 11 and 12. In the embodiments shown in Figures 1 and 2, tension is applied evenly to all of the main ropes 3 by adjusting the rope length of the main ropes 3 so as to adjust the load application position of some of the main ropes 3. The length of the threaded rod 7, which is provided at the other free end of each main rope 3, is determined by fixing the inner nut 12 at the portion that protrudes toward the tip side (downward side in Figure 1) from the rope base 2b provided at the upper end of the counterweight 2. The load application position of each main rope 3 is determined by this protrusion length. For this reason, in the embodiments, the length of the threaded rod 7 protruding from the rope base 2b is adjusted by adjusting the fixing position of the inner nut 12 using a rope length adjustment jig 32.

[0028] The rope length adjustment jig 32 consists of a first receiving plate 33 and a second receiving plate 34, two adjustment bolts 40, and two adjustment nuts 44. The two adjustment bolts 40 pass through each receiving plate 33, 34, and the adjustment nuts 44 are attached to the portion of each adjustment bolt 40 that passes through each receiving plate and protrudes from each receiving plate. The first receiving plate 33 is positioned on the side of the adjustment nuts 44, and the second receiving plate 34 is positioned on the side of the heads 40a of the adjustment bolts 40.

[0029] As shown in Figure 3, each receiving plate 33, 34 is made of a metal or strong material such as steel or an aluminum alloy, and is formed in the shape of a rectangular plate. A substantially U-shaped opening 35 is formed in the longitudinal center of each receiving plate 33, 34, and this opening 35 opens to one end edge in the short direction of the receiving plate 33, 34. Each opening 35 is detachably engaged with a threaded rod 7 provided on the main rope 3. Each opening 35 is formed by including a semicircular portion 36 provided at the far end and having a diameter slightly larger than the diameter of the threaded rod 7, and a rectangular portion 37 that is continuous with the semicircular portion 36 and has the same width as the diameter of the semicircular portion 36.

[0030] The two receiving plates 33 and 34 are used overlapping each other, and in this state, the openings 35 of each plate open in opposite directions in the short-side direction of the receiving plates 33 and 34. The opening 35 of the second receiving plate 34 corresponds to the second opening. The second receiving plate 34 may be the first receiving plate 33 with its front and back reversed. When the two receiving plates 33 and 34 are overlapped, the overlapping portions in the thickness direction of the inner sides of each opening 35 form a roughly circular through hole when viewed in the thickness direction. The threaded rod 7 provided on the main rope 3 passes through this through hole, and the outer nut 13 is fixed to the portion protruding from the through hole. This more reliably prevents the threaded rod 7 from coming off the two receiving plates 33 and 34.

[0031] Furthermore, in each receiving plate 33, 34, two through holes 38 are provided around the opening 35 at two positions flanking the opening 35. Two adjustment bolts 40 pass through each through hole 38, and when adjusting the rope length of the main rope 3, the tips of each adjustment bolt 40 are pressed against the rope base 2b, as shown in Figure 4C(b) described later.

[0032] Each of the two adjustment nuts 44 has an adjustment bolt 40 screwed into it, which adjusts the length of the adjustment bolt 40 protruding from the first receiving plate 33. Then, with the tip of each adjustment bolt 40 pressed against the rope base 2b, the gap between the rope base 2b and the first receiving plate 33 is widened by tightening each adjustment bolt 40 into each adjustment nut 44. After this gap is widened, the length of the main rope 3 protruding from the rope base 2b is adjusted by tightening the inner nut 12 onto the threaded rod 7 and fixing it in place while pressed against the rope base 2b.

[0033] Figures 4A to 4D will be used to explain in more detail the rope length adjustment method using the rope length adjustment jig 32. As shown in Figure 4A(a), in the state before adjusting the main rope, an inner nut 12 and an outer nut 13 are fixed to the portion of the threaded rod 7 attached to the main rope 3 that protrudes from the rope base 2b. The inner nut 12 is pressed against the side of the rope base 2b to determine the load application position of the main rope 3, that is, the position where the load of the counterweight acts on the main rope 3. In this state, the outer nut 13 is pressed against the inner nut 12 to prevent the inner nut 12 from loosening.

[0034] Next, as shown in Figure 4A(b), in the first step, the worker performing the rope length adjustment rotates the outer nut 13 in the loosening direction using a wrench, thereby releasing the loosening lock on the outer nut 13 and widening the gap between the inner nut 12 and the outer nut 13. At this time, since the load of the counterweight 2 applied from the rope base 2b is supported by the inner nut 12, the force required to rotate the outer nut 13 in the loosening direction is small, and the rotation work is easy.

[0035] Then, the opening 35 of the first receiving plate 33 is detachably engaged with the portion between the inner nut 12 and the outer nut 13 of the threaded rod 7. At this time, before engaging the first receiving plate 33 with the threaded rod 7, an adjustment bolt 40 can be passed through one of the through holes 38 of the two receiving plates 33 and 34 on the longitudinal side from below, and an adjustment nut 44 can be attached to the portion protruding from the first receiving plate 33.

[0036] In this configuration, as shown in Figure 4B, the two support plates 33 and 34 are supported so as to be able to swing relative to each other around the adjustment bolt 40, allowing the worker to lift the two support plates 33 and 34 and one of the adjustment bolts 40 and adjustment nuts 44 together for the work. This eliminates the need for the complicated work described in Figures 4A(b) and 4B, which involves stacking the two support plates so that their opposing surfaces align and lifting them to a position between the inner nut 12 and the outer nut 13, then passing the adjustment bolt 40 through one of the longitudinal through holes in each support plate and connecting the adjustment nut 44 to the adjustment bolt 40. This makes the adjustment work easier for the worker.

[0037] Next, the second support plate 34 is moved in the direction of arrow α in Figure 4B so that the entire lower surface of the second support plate 34 coincides with and overlaps the entire upper surface of the first support plate 33. Then, as shown in Figure 4C(a), in the second step, the threaded rod 7 is engaged with the opening 35 of the second support plate 34, and in this state, another adjustment bolt 40 is passed through from below into the through hole 38 on the other side in the longitudinal direction of each support plate 33, 34, and the adjustment nut 44 is attached to the portion of the adjustment bolt 40 that protrudes from the first support plate 33. In this state, the lower surface of the second support plate 34 is pressed against the outer nut 13 by the weight of each support plate 33, 34. Note that the order in which the openings 35 of the first receiving plate 33 and the second receiving plate 34 are engaged with the threaded rod 7 may be the reverse of that shown in Figures 4A(b) and 4C(a), that is, the opening 35 of the second receiving plate 34 may be engaged with the threaded rod 7 first, followed by the opening 35 of the first receiving plate 33.

[0038] Next, as shown in Figure 4C(b), in the third step, with the outer nut 13 pressed against the lower surface of the second support plate 34, each adjustment bolt 40 is tightened into each adjustment nut 44, causing the tip of each adjustment bolt 40 to abut against the lower surface of the rope base 2b. Further tightening of each adjustment bolt 40 into each adjustment nut 44 widens the gap between the rope base 2b and the first support plate 33. As a result, the inner nut 12 moves away from the lower surface of the rope base 2b, and the load of the counterweight 2 from the rope base 2b is applied to the outer nut 13 via the adjustment bolts 40 and each support plate 33, 34. At this time, as the gap between the rope base 2b and the first support plate 33 widens, the protruding length L2 of the threaded rod 7 from the rope base 2b becomes Ld greater than the protruding length L1 in Figure 4C(a). This allows the protruding length of the threaded rod 7 to be adjusted.

[0039] Subsequently, as shown in Figure 4D(a), in the fourth step, the inner nut 12 is tightened onto the threaded rod 7 so that it is pressed against the lower side surface of the rope base 2b, and then the tightening of each adjustment bolt 40 on each adjustment nut 44 is loosened. After removing at least one adjustment bolt 40 from each receiving plate 33, 34, the two receiving plates 33, 34 are removed from between the inner nut 12 and the outer nut 13. When removing the two receiving plates 33, 34, the inner nut 12 is pressed against the side surface of the rope base 2b, so that no large force is applied from the rope base 2b to each receiving plate 33, 34 and the adjustment bolt 40, and each receiving plate 33, 34 can be easily removed.

[0040] Next, as shown in Figure 4D(b), in the fifth step, the outer nut 13 is tightened and pressed against the inner nut 12, thereby preventing the inner nut 12 from loosening, and the adjustment work is completed. Since this tightening of the outer nut 13 can be done without the load of the counterweight 2 being applied to the outer nut 13, the worker can easily tighten the outer nut 13 by hand.

[0041] According to the rope length adjustment jig 32 and rope length adjustment method described above, each adjustment bolt 40 is made smaller in diameter than the threaded rod 7, and the gap between the rope base 2b and the first receiving plate 33 can be widened by rotating the adjustment bolt 40 relative to the small-diameter adjustment nut 44 corresponding to each adjustment bolt 40. As a result, one worker can easily rotate the adjustment bolt 40 and the adjustment nut 44 relative to each other without requiring great force, so the rope length of the main rope 3 can be easily adjusted individually. Furthermore, when pressing the inner nut 12 against the rope base 2b after adjusting the protruding length of the threaded rod 7, a large axial load is applied to the outer nut 13 from the rope base 2b via the adjustment bolt 40. Therefore, a large load is not applied to the inner nut 12 from the rope base 2b, so the worker does not need great force when rotating the inner nut 12. In addition, when tightening the inner nut 12, a large force acts on the outer nut 13 in the direction that pulls the threaded rod 7 due to the axial load described above, so the threaded rod 7 does not rotate together. Furthermore, the receiving plates 33 and 34 can be easily positioned between the inner nut 12 and the outer nut 13 by fitting them onto the threaded rod 7 from the opening ends 35 of the openings 35 of each receiving plate 33 and 34 and engaging them with the main rope 3. Also, there is no need to remove the outer nut 13 from the threaded rod 7 when positioning them. In addition, as described above, the work of removing the receiving plates 33 and 34 from the threaded rod 7 is easy, which makes it easier to remove the rope length adjustment jig 32. This reduces the burden on the worker and shortens the time required for adjusting the rope length.

[0042] Furthermore, in this embodiment, the second receiving plate 34 is inserted between the inner nut 12 and the outer nut 13 so as to overlap the first receiving plate 33. With the two adjustment bolts 40 passing through the two receiving plates 33 and 34, the overlapping state of the two receiving plates 33 and 34 is maintained, and the threaded rod 7 does not come out of the opening 35 of each receiving plate. This makes it possible to more reliably prevent the receiving plates 33 and 34 from coming off the main rope 3 even if the main rope 3 shakes during rope length adjustment work.

[0043] Figure 5 is an exploded view of a rope length adjustment jig 32a of another embodiment. In this example, the two adjustment nuts 44 of the rope length adjustment jig 32a are fixed to the first receiving plate 33 on the side opposite to the second receiving plate 34 (top surface), such that the screw holes of each adjustment nut 44 coincide with one end (upper end) of each through hole 38 of the first receiving plate 33. With this configuration, the worker does not need to hold the adjustment nuts 44 and the first receiving plate 33 separately by hand while working. Also, when tightening or loosening the adjustment bolt 40 on the adjustment nut 44, it is not necessary to hold the adjustment nut 44 in place to prevent it from rotating. As a result, the rope length adjustment work can be greatly simplified. Therefore, the time required for rope length adjustment can be greatly reduced.

[0044] Figure 6 is an exploded view of a rope length adjustment jig 32b of another embodiment. In this example, two adjustment nuts are omitted compared to the configurations in Figures 1 to 4D or Figure 5. Instead, in the rope length adjustment jig 32b of this example, instead of the two through holes in the first receiving plate 33a, two screw holes 39 are provided around the opening 35 at the same positions as the two through holes. An adjustment bolt 40 is screw-connected to each screw hole 39 of the first receiving plate 33a, and the tip of each adjustment bolt 40 is pressed against the rope base 2b (Figure 1). By tightening each adjustment bolt 40 into each screw hole 39, the distance between the rope base 2b and the first receiving plate 33 is increased.

[0045] Figures 7A to 7C illustrate in detail the rope length adjustment method using the rope length adjustment jig 32b. Each step in Figures 7A, 7B, and 7C corresponds to each step in Figures 4A, 4C, and 4D, respectively. As shown in Figures 7A to 7B(a), in the first and second steps, each adjustment bolt 40 is passed through the through hole 38 of the second receiving plate 34, then screwed into the screw hole 39 of the first receiving plate 33a, and further protrudes upward from the first receiving plate 33a. Then, as shown in Figure 7B(b), in the third step, with the outer nut 13 pressed against the lower surface of the second receiving plate 34, the tip of each adjustment bolt 40 is abutted against the lower surface of the rope base 2b, and each adjustment bolt 40 is further tightened into the screw hole 39, thereby widening the gap between the rope base 2b and the first receiving plate 33a. This increases the protruding length of the threaded rod 7 from the rope base 2b.

[0046] Subsequently, as shown in Figure 7C(a), in the fourth step, the inner nut 12 is tightened onto the threaded rod 7 so that it presses against the lower surface of the rope base 2b, and then the tightening of each adjustment bolt 40 in each screw hole 39 is loosened. After removing at least one of the adjustment bolts 40 from each receiving plate 33a, 34, the two receiving plates 33a, 34 are removed from between the inner nut 12 and the outer nut 13, and in the fifth step, as shown in Figure 7C(b), the adjustment work is completed by tightening the outer nut 13 and pressing it against the inner nut 12.

[0047] According to the configuration in this example, there is no need to screw the adjustment bolt 40 into the adjustment nut, which is separate from each receiving plate 33a, 34. This reduces the number of parts and eliminates the need for the worker to hold the adjustment nut or to hold it in place to prevent it from rotating. As a result, the cost of the rope length adjustment jig 32b can be reduced, and the rope length adjustment work can be made significantly easier. Consequently, the time required for rope length adjustment can be significantly reduced. In the configurations of Figure 5 and Figures 6 to 7C, the other configurations and operations are the same as those in Figures 1 to 4D.

[0048] Figures 8A and 8B show two examples of first support plates 33c and 33d of an alternative embodiment. The first support plate 33c of the first example shown in Figure 8A is entirely disc-shaped, with a substantially U-shaped opening 50 extending radially in a portion of its circumference. Three through holes 51, 52, and 53 for adjustment bolts are formed at three circumferentially separated positions on the first support plate 33c. Two of the through holes 51 and 52 are formed on either side of the opening 50, and the remaining through hole 53 is formed at a position 180 degrees out of phase with the opening 50. In the first support plate 33c, three adjustment bolts 40 pass through the three through holes 51, 52, and 53, and an adjustment nut 44 is connected to each adjustment bolt 40.

[0049] Furthermore, the first support plate 33c can be used in conjunction with a second support plate, the second support plate having an opening 50 and a through hole 53 located at positions that are 180 degrees apart in phase. The second support plate may be the first support plate 33c with its front and back reversed. An adjustment bolt 40, which passes through the through hole located at a position 180 degrees apart in phase from the opening of the second support plate, passes through the radially outer portion of the opening 50 of the first support plate 33c in the thickness direction, and an adjustment nut 44 is attached to the portion that has passed through.

[0050] Alternatively, an adjustment bolt 40 that penetrates the radially outer portion of the opening of the second support plate in the thickness direction may be passed through the through hole 53 of the first support plate 33c, and an adjustment nut 44 may be attached to the through portion. In this case, the distance between the rope base 2b and the first support plate 33c can be increased by pressing the tips of the four adjustment bolts 40 against the side surface of the rope base 2b and tightening each adjustment bolt 40 onto each adjustment nut 44. When using the first support plate 33c as shown in Figure 8A, the number of adjustment bolts 40 can be increased to three or four, thus reducing the load on each adjustment bolt 40 from the rope base 2b.

[0051] In the case of the first support plate 33d of the second example shown in Figure 8B, the opening 50a is bent into an L-shape, similar to the first support plate 33c in Figure 8A. When using the first support plate 33d of the second example, the second support plate is not used for adjusting the rope length; only one support plate is used. Specifically, three adjustment bolts 40 are passed through the three through holes 51, 52, and 53 of the first support plate 33d, and adjustment nuts 44 are attached to each through portion. Then, the tip of each adjustment bolt 40 is pressed against the side of the rope base 2b, and each adjustment bolt 40 is tightened into each adjustment nut 44 to increase the distance between the rope base 2b and the first support plate 33d. Since the first receiving plate 33d in Figure 8B has an L-shaped opening 50a, the threaded rod 7 is detachably engaged with the back of the opening 50a, and when tightening the adjustment bolts 40 to press the tips of each adjustment bolt 40 against the lower surface of the rope base 2b, the threaded rod 7 is less likely to come out of the opening 50a.

[0052] The above describes the case in which the first support plates 33c and 33d, adjustment bolt 40, and adjustment nut 44 shown in Figures 8A and 8B are used. However, it is also possible to fix the adjustment nut 44 to each of the first support plates 33c and 33d, or to form screw holes in each of the first support plates 33c and 33d instead of through holes.

[0053] Figure 9 shows the rope length adjustment jig 32 shown in Figure 2 attached to a threaded rod 7a on the main rope 3a of another example, to adjust the rope length. In this example, unlike the main rope 3 shown in Figure 1, the threaded rod 7a on the main rope 3a has a portion that protrudes downward from the rope base 2b that passes through the spring receiving plate 55 downward, and an inner nut 12 is fixed to the portion that protrudes downward from the spring receiving plate 55. A coil spring 56 is provided between the rope base 2b and the spring receiving plate 55. In this configuration as well, the load application position of the main rope 3a is determined by the fixing position of the inner nut 12, similar to the examples above. The spring receiving plate 55 corresponds to a second rope base. In this configuration, vibrations of the main rope 3a are more easily absorbed by the coil spring 56.

[0054] When adjusting the rope length of the main rope 3a shown in Figure 9, the rope length adjustment jigs of each example described above can also be used. Figure 9 shows the case where the main rope length is adjusted using the rope length adjustment jig 32 shown in Figures 1 to 3. In this case, the first receiving plate 33 and the second receiving plate 34 are inserted between the inner nut 12 and the outer nut 13 of the threaded rod 7a provided on the main rope 3a. The openings 35 of each receiving plate 33 and 34 are detachably engaged with the threaded rod 7a. Two adjustment bolts 40 that pass through the through holes of each receiving plate 33 and 34 are screwed into the adjustment nuts 44, and the tips of each adjustment bolt 40 are pressed against the spring receiving plate 55, and each adjustment bolt 40 is tightened into each adjustment nut 44, thereby widening the gap between the spring receiving plate 55 and the first receiving plate 33. As a result, the protrusion length of the threaded rod 7a from the spring receiving plate 55 increases. In the rope length adjustment method for the main rope 3a shown in Figure 9, the other configurations and effects are the same as those in Figures 1 to 4D, except that the object against which the inner nut 12 and adjustment bolt 40 are pressed has changed from the rope base 2b to the spring receiving plate 55. Furthermore, when adjusting the rope length of the main rope shown in Figure 9 using the rope length adjustment jigs 32a and 32b shown in Figure 5 or Figure 6, the rope length adjustment work can be further simplified.

[0055] Figure 10 shows the state of adjusting the rope length using the rope length adjustment jig 32 of Figure 2 in another type of elevator. The basic configuration of this type of elevator is the same as the elevators shown in Figures 14 and 15, where the movement of the main rope 20 is guided by a pulley 21 below the elevator car 1 and a pulley 23 provided above the counterweight 22, and the elevator car 1 and the counterweight 22 are raised and lowered by moving the main rope 20 by driving a hoisting machine 24 provided above. The upper pulley may not be driven by the hoisting machine, but instead another pulley around which the middle part of the main rope 20 is wound may be driven by the lower hoisting machine below the elevator shaft. In this type, the threaded rod 25 provided at the free end of the main rope 20 has a portion that protrudes upward from a support plate 26 fixed to the top of the building, which is passed through a spring receiving plate 28, and an internal nut 29 is fixed to the portion that protrudes above the spring receiving plate 28. In the threaded rod 25, a coil spring 27 is provided around the portion between the support plate 26 and the spring receiving plate 28. In this configuration, the position where the load is applied to the main rope 20 is determined by the fixing position of the inner nut 29.

[0056] In the case of an elevator of the type shown in Figure 10, the rope length of the main rope 20 can also be adjusted using the rope length adjustment jigs of each example described above. Figure 10 shows the case in which the main rope length is adjusted using the rope length adjustment jig 32 shown in Figures 1 to 3. In this case, a first support plate 33 and a second support plate 34 are inserted between an inner nut 29 and an outer nut 30 on the threaded rod 25 provided on the main rope 20. The openings 35 of each support plate 33 and 34 are detachably engaged with the threaded rod 25. Two adjustment bolts 40 that pass through the through holes of each support plate 33 and 34 from above are screwed into the adjustment nuts 44, and the tips of each adjustment bolt 40 are pressed against the spring support plate 28, and each adjustment bolt 40 is tightened into each adjustment nut 44, thereby widening the gap between the spring support plate 28 and the first support plate 33. As a result, the protrusion length of the threaded rod 25 from the spring support plate 28 increases. In the rope length adjustment method for the main rope 20 shown in Figure 10, the other configurations and effects are the same as those in Figures 1 to 4D, except that the object against which the inner nut 12 and adjustment bolt 40 are pressed changes from the rope base 2b to the spring receiving plate 28, and the positional relationship of the rope length adjustment jig 32 and the direction of movement of each component are reversed vertically. Furthermore, when adjusting the rope length of the main rope shown in Figure 10 using the rope length adjustment jigs 32a and 32b shown in Figure 5 or Figure 6, the rope length adjustment work can be further simplified. [Explanation of Symbols]

[0057] 1 elevator car, 2 counterweight, 2a frame member, 2b rope base, 3,3a main rope, 4 Machine room, 6 Hoisting machine, 7,7a Threaded rod, 8 Nut, 9 Connection part, 10 Worker, 11 Rotation restraining member, 12 Inner nut, 13 Outer nut, 20 Main rope, 21 Pulley, 22 Weight, 23 Pulley, 24 Hoisting machine, 25 Threaded rod, 26 Support plate, 27 Coil spring, 28 Spring receiving plate, 29 Inner nut, 30 Outer nut, 32,32a,32b Rope length adjustment jig, 33,33a,33b,33c,33d First receiving plate, 34 Second receiving plate, 35 Opening, 36 Semicircular part, 37 Rectangular part, 38 Through hole, 39 Threaded hole, 40 Adjustment bolt, 40a Head, 44 Adjustment nut, 50,50a Opening, 51,52,53 Through hole, 55 Spring receiving plate, 56 Coil spring, 80 hoistway.

Claims

1. A rope length adjustment jig for elevator car lifting main ropes, wherein the load application position of each main rope is determined by the length of the threaded rod protruding from the rope base at the free end of each main rope, the length of the threaded rod protruding from the rope base is determined by fixing an internal nut to each main rope, and the position of the internal nut is fixed by an external nut for preventing loosening, A receiving plate having an opening that is inserted between the inner nut and the outer nut and detachably engages with the threaded rod, and a plurality of through holes provided around the opening, for any one of the plurality of main ropes, Multiple adjustment bolts that pass through each of the aforementioned through holes and whose tips are pressed against the rope base, The aforementioned multiple adjustment bolts are screwed into an adjustment nut that adjusts the protruding length of the adjustment bolts, It has, The aforementioned multiple adjustment bolts have a smaller diameter than the threaded rod. A rope length adjustment jig for the main rope used for raising and lowering an elevator car, characterized in that the distance between the rope base and the receiving plate is increased by tightening each of the adjustment bolts onto each of the adjustment nuts.

2. In the rope length adjustment jig according to claim 1, A rope length adjustment jig characterized in that the adjustment nut is fixed to the receiving plate.

3. A rope length adjustment jig for elevator car lifting main ropes, wherein the load application position of each main rope is determined by the length of the threaded rod protruding from the rope base at the free end of each main rope, the length of the threaded rod protruding from the rope base is determined by fixing an internal nut to each main rope, and the position of the internal nut is fixed by an external nut for preventing loosening, A receiving plate is provided for any one of the plurality of main ropes, having an opening that is inserted between the inner nut and the outer nut and detachably engages with the threaded rod, and a plurality of threaded holes provided around the opening. Multiple adjustment bolts are screw-connected to each of the screw holes in the receiving plate, with their tips pressed against the rope base, It has, The aforementioned multiple adjustment bolts have a smaller diameter than the threaded rod. A rope length adjustment jig for the main rope used for raising and lowering an elevator car, characterized in that the distance between the rope base and the receiving plate is increased by tightening each of the adjustment bolts into each of the screw holes.

4. In a rope length adjustment jig for the main rope used for raising and lowering an elevator car, according to any one of claims 1 to 3, The second receiving plate is inserted between the inner nut and the outer nut so as to overlap the receiving plate, and is detachably engaged with the threaded rod. The second receiving plate has a second opening that opens in the opposite direction to the opening, and a second plurality of through holes through which the plurality of adjustment bolts pass. A tool for adjusting the length of the main rope used for raising and lowering the elevator car.

5. A method for adjusting the rope length of a main rope for raising and lowering an elevator car, using the rope length adjustment jig described in claim 1 or 2, A method for adjusting the rope length of the main rope for ascending and descending an elevator car, comprising: pressing the outer nut against the side of the receiving plate; abutting the tips of the multiple adjustment bolts against the side of the rope base; further tightening each adjustment bolt into each adjustment nut to widen the gap between the rope base and the receiving plate; tightening the inner nut into the threaded rod so as to press it against the side of the rope base; and then removing the receiving plate from between the inner nut and the outer nut.

6. A method for adjusting the rope length of the main rope for raising and lowering an elevator car using the rope length adjustment jig described in Claim 3, A method for adjusting the rope length of the main rope used for ascending and descending an elevator car, comprising: pressing the outer nut against the side of the receiving plate; abutting the tips of the multiple adjustment bolts against the side of the rope base; further tightening each adjustment bolt into each screw hole to widen the gap between the rope base and the receiving plate; tightening the inner nut onto the screw rod so that it presses against the side of the rope base; and then removing the receiving plate from between the inner nut and the outer nut.

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