Elevator fixing rod holding device and main rope replacement method

Abstract

A fixing rod holding device (90) according to the present invention holds a fixing rod (10) between a support nut (15) and a coil spring (13) when removing the fixing rod (10) from or attaching the fixing rod (10) to a rod support (40). The fixing rod holding device (90) comprises a holding part (94) including a first block (91) and a second block (92) that are coupled by a coupling member (93) so as to be capable of opening and closing in the horizontal direction. When the holding part (94) is in a closed state, a through hole (95) through which the fixing rod (10) can pass is formed by the joined surfaces of the surfaces of the first block (91) and the second block (92). An engaging part (96) that engages a male thread (16) provided on the outer periphery of the fixing rod (10) and prevents the movement of the fixing rod (10) in the axial direction is formed in the through hole (95). A closing part (97) that closes the first block (91) and the second block (92) is provided on the reverse side of the holding unit (94) from the coupling member (93).

Description

Elevator fixed rod gripping device and main rope replacement method

[0001] The present invention relates to a fixed rod gripping device and a main rope replacement method for an elevator.

[0002] In the process of replacing the main rope of a 2:1 rope elevator, workers must remove the end of the existing main rope and fix the end of a new main rope to the machine room floor or the beam above the hoistway where the rope end is fixed (see Patent Document 1). The end of the main rope is connected to a fixed rod with a male thread, and the fixed rod is supported on a so-called rod support, such as the machine room floor or the beam above the hoistway, by threading a support nut onto the male thread via a coil spring. When removing or attaching the main rope end, the worker must tighten or loosen the support nut while holding the fixed rod with his or her hand to prevent the fixed rod from falling.

[0003] Japanese Patent Application Laid-Open No. 2008-037624

[0004] Elevator main ropes are generally installed in multiple lengths and weigh more than 1 kg per meter, so the existence of a process in rope replacement work that relies on manual labor by workers, as described above, reduces work efficiency.

[0005] The fixed rod gripping device of the present invention is used in an elevator in which a fixed rod connected to the end of the elevator main rope is supported by a support nut via a coil spring on a rod support provided in a hoistway.The device grips the fixed rod between the support nut and the coil spring when the fixed rod is removed from or attached to the rod support, and is equipped with a holding section including a first block and a second block connected by a connecting member so that it can be opened and closed horizontally.When the holding section is in a closed state, a through hole is provided at the joint surface of the first block and the second block, through which the fixed rod can pass, and a locking section is formed in the through hole that engages with a male threaded section provided on the outer periphery of the fixed rod and prevents axial movement of the fixed rod, and a closing section that closes the first block and the second block is provided on the side of the holding section opposite the connecting member.

[0006] The main rope replacement method according to the present invention is a method for replacing an elevator main rope using the fixed rod gripping device according to the present invention, and includes the steps of: lifting up the existing fixed rod to separate the coil spring and the support nut, and attaching the fixed rod gripping device between the coil spring and the support nut, in order to remove the existing fixed rod connected to the end of the existing main rope from the rod support; removing the support nut from the male threaded portion of the existing fixed rod, connecting one end of the rod guide rope to the upper end of the existing fixed rod via a rod guide rope wire, and then removing the fixed rod gripping device from the existing fixed rod, and while letting out the rod guide rope, removing the existing fixed rod from the rod support, and a step of connecting one end of the rod guide rope to the upper end of the new fixed rod via a wire for the rod guide rope, and then pulling the rod guide rope up to the upper side of the rod support and attaching a fixed rod holding device to the new fixed rod via a coil spring in order to attach the new fixed rod connected to the end of the new main rope to the rod support; a step of removing the rod guide rope and the wire for the rod guide rope from the upper end of the new fixed rod and attaching a support nut to the male thread portion of the new fixed rod; and a step of removing the fixed rod holding device from the new fixed rod, supporting the new fixed rod on the rod support via the coil spring, and attaching the new main rope to the rod support.

[0007] According to the present invention, by gripping the fixed rod with the gripping device, the worker can use both hands to perform tasks such as tightening and loosening the support nut, making it possible to easily attach and detach the fixed rod to and from the rod support. Furthermore, according to the main rope replacement method of the present invention, the process that relies on manual labor by the worker can be shortened, making it possible to replace the main rope more efficiently than before.

[0008] FIG. 1 is a diagram illustrating a schematic configuration for explaining the mechanism of a 2:1 roping elevator. FIG. 2 is an enlarged view of a rope stopper. FIG. 3 is an enlarged view of a rope stopper showing a state in which a worker is holding a fixed rod. FIG. 4 is a perspective view of a fixed rod gripping device according to an embodiment, viewed from the closing section side. FIG. 5 is a perspective view of a fixed rod gripping device according to an embodiment, viewed from the connecting section side. FIG. 6 is a diagram illustrating a fixed rod gripping device according to an embodiment, viewed from above. FIG. 7 is an overall perspective view showing an open state of a fixed rod gripping device according to an embodiment. FIG. 8 is an enlarged view of a rope stopper showing a state in which a fixed rod gripping device according to an embodiment is in use. FIG. 9 is an enlarged view of a rope stopper showing a state in which a fixed rod gripping device according to an embodiment is in use. FIG. 10 is a flow diagram illustrating a method for replacing a main rope of a 2:1 roping elevator. FIG. 11 is a diagram illustrating a schematic configuration for explaining a method for replacing a main rope of a 2:1 roping elevator. FIG. 12 is a diagram illustrating a schematic configuration for explaining removal of an existing fixed rod in a method for replacing a main rope using a fixed rod gripping device according to an embodiment. FIG. 1 is a diagram illustrating a schematic configuration for explaining the removal of an existing fixed rod in a main rope replacement method using a fixed rod holding device that is an example of an embodiment. FIG. 2 is a diagram illustrating a schematic configuration for explaining a state during work in a main rope replacement method using a fixed rod holding device that is an example of an embodiment. FIG. 3 is a diagram illustrating a schematic configuration for explaining the installation of a new fixed rod in a main rope replacement method using a fixed rod holding device that is an example of an embodiment. FIG. 4 is a diagram illustrating a schematic configuration for explaining the installation of a new fixed rod and the work completion state in a main rope replacement method using a fixed rod holding device that is an example of an embodiment.

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that the embodiment described below is merely an example, and the present invention is not limited to the following embodiment. Figure 1 is a diagram showing a schematic configuration for explaining the mechanism of a 2:1 rope elevator. Figure 2 is an enlarged view of a rope stopper.

[0010] As shown in Figure 1, a 2:1 rope elevator allows passengers (not shown) to travel to each floor between a top floor landing 22 and a bottom floor landing 23 by having a car 2 and a counterweight 3 connected to a main rope 7 rise and fall in a bucket-like manner in a hoistway 1. The main rope 7 is wound around a car pulley 21 provided on the top of the car 2, a counterweight pulley 31 provided on the top of the counterweight 3 linked to the car 2, and a sheave 51 and a deflector sheave 6 of a hoisting machine 5 installed in a machine room 4 above the hoistway 1.

[0011] Fixed rods 10 are connected to both ends of the main rope 7 via rope sockets 8, and the fixed rods 10 pass through openings 41 provided in the rod supports 40 and are supported by the rod supports 40 via rope stoppers 9. The rod supports 40 are provided in the hoistway 1, and in elevators in which a machine room 4 is provided above the hoistway 1, they are the floor of the machine room 4. In elevators that do not have a machine room 4, a beam provided above the hoistway 1 corresponds to the rod supports 40.

[0012] As shown in Figure 2, the rope stopper 9 is a mechanism in which a fixed rod 10 connected to the end of a main rope 7 via a rope socket 8 passes through an opening 41 provided in a rod support 40 and is supported by a support nut 15 on the upper side of the rod support 40 via a coil spring 13 or the like, which will be described later.

[0013] The rope socket 8 is a substantially cylindrical jig with openings at the top and bottom, and a pin hole 17, which is a through hole for inserting a rod pin 11 (described later), is provided horizontally near the upper opening. The rope socket 8 may narrow toward the lower main rope 7 side opening. The main rope 7 is inserted through the main rope 7 side opening, folded back inside the rope socket 8, and fixed to the rope socket 8 by a well-known terminal processing method. The fixed rod 10 inserted through the upper opening is connected to the end of the main rope 7 via the rope socket 8 by being engaged with the rod pin 11 that passes through a split pin hole (not shown) provided at the lower end of the fixed rod 10 and the pin hole 17 of the rope socket 8.

[0014] The fixed rod 10 is a rod-shaped member and has a male thread portion 16 at its upper end, which is the other end side of the end fixed to the rope socket 8 by the rod pin 11. The fixed rod 10, which is connected to the end of the main rope 7, passes through an opening 41 in the rod support 40 and protrudes above the rod support 40 via the rod support side spring bearing member 12, the coil spring 13, and the support nut side spring bearing member 14. The fixed rod 10 is supported by the rod support 40 by attaching a support nut 15 to the male thread portion 16. The support nut 15 may be, for example, a double nut that combines a type 3 nut and a type 1 nut.

[0015] The coil spring 13 has the function of elastically supporting the fixed rod 10 relative to the rod support member 40. Specifically, by loosening or tightening a support nut 15 attached to the male thread portion 16 of the fixed rod 10, the coil spring 13 is elastically deformed, making it possible to adjust the tension of the main rope 7. The inner diameter of the coil spring 13 is set to a size that allows the fixed rod 10 to be inserted therethrough, and also allows a rod guide rope wire 77 and a rod guide rope 78, which will be described later with reference to Figure 3, to be inserted therethrough.

[0016] Next, a procedure for attaching and detaching the conventional fixed rod 10 will be described with reference to Fig. 3. Fig. 3 is an enlarged view of the rope stopper showing the state in which a worker is holding the fixed rod.

[0017] As shown in Figure 3, in the work of replacing the main rope 7, to remove the existing fixed rod 10 from the rod support 40, a worker 80 holds the fixed rod 10 with one hand and removes the support nut 15 (see Figure 2) from the male thread portion 16 of the fixed rod 10. Then, the worker 80 needs to hold the fixed rod 10 with one hand until he or she passes a rod guide rope wire 77 through a split pin hole 18 provided at the upper end of the fixed rod 10 and connects one end of a rod guide rope 78 to the upper end of the fixed rod 10 via the rod guide rope wire 77. Thereafter, the worker pulls out the fixed rod 10 from the rod support 40 through the opening 41 while letting out the rod guide rope 78 so that it passes through the inner diameter of the coil spring 13, thereby removing the existing main rope 7 from the rod support 40.

[0018] Meanwhile, in the work of replacing the main rope 7, in order to attach a new fixed rod 10 to the rod support 40, one end of a rod guide rope 78 is connected in advance to the upper end of the fixed rod 10 below the rod support 40 via a rod guide rope wire 77. Next, the worker 80 pulls the rod guide rope 78 up to the rod support 40 through the opening 41 and inserts the fixed rod 10 through the rod support-side spring receiving member 12, the coil spring 13, and the support nut-side spring receiving member 14, in that order, until the fixed rod 10 protrudes above the rod support 40. The worker 80 must remove the rod guide rope 78 and the rod guide rope wire 77 from the upper end of the fixed rod 10 and hold the fixed rod 10 with one hand until the support nut 15 (see FIG. 2 ) is attached to the male thread portion 16 of the fixed rod 10. The new main rope 7 is attached to the rod support 40 by supporting the fixed rod 10 on the rod support 40 with the support nut 15 via the coil spring 13.

[0019] The fixed rod gripping device 90 will be described in detail using Figures 4 to 7. Figure 4 is a perspective view of a fixed rod gripping device according to an embodiment, as viewed from the closing portion side. Figure 5 is a perspective view of a fixed rod gripping device according to an embodiment, as viewed from the connecting portion side. Figure 6 is a view of a fixed rod gripping device according to an embodiment, as viewed from above. Figure 7 is an overall perspective view of a fixed rod gripping device according to an embodiment, in an open state.

[0020] 4, the fixed rod gripping device 90 includes a holding portion 94 including a first block 91 and a second block 92 connected by a connecting member 93 so as to be openable and closable in the horizontal direction. The connecting member 93 is, for example, a hinge.

[0021] Because elevator main ropes 7 are typically secured to the rod support 40 (see FIG. 2) by rope stoppers 9 (see FIG. 2), the horizontal size of the retaining portion 94 of the fixed rod gripping device 90 in the closed state is preferably smaller than that of the support nut-side spring receiving member 14 (see FIG. 2) to avoid interference with nearby rope stoppers 9. Furthermore, the support nut-side spring receiving member 14 is preferably, for example, disc-shaped, and its outer diameter is preferably larger than the outer diameter of the lower end surface of the retaining portion 94 in the closed state. This increases the contact area between the lower end surface of the retaining portion 94 and the upper surface of the support nut-side spring receiving member 14, thereby reducing the surface pressure applied by the retaining portion 94 to the support nut-side spring receiving member 14. This allows the support nut-side spring receiving member 14 to stably hold the retaining portion 94 while suppressing its own deformation.

[0022] As shown in Figure 5, when the connecting member 93 is a hinge, the blades 100 and 101 are connected so as to be rotatable via a hinge shaft 102 and are fixed to the first block 91 and the second block 92 by screws 103, respectively, and the holding portion 94 can be opened and closed horizontally.

[0023] When the holding portion 94 is in the closed state, a through hole 95 through which the fixed rod 10 can pass is provided in the joint surfaces of the first block 91 and the second block 92 .

[0024] A locking portion 96 is formed in the through hole 95. The locking portion 96 engages with a male thread portion 16 (see FIG. 2) provided on the outer periphery of the fixing rod 10 and functions to prevent axial movement of the fixing rod 10. In this embodiment, the locking portion 96 is a female thread portion provided on the inner periphery of the through hole 95.

[0025] As will be described later, even when the support nut 15 (see FIG. 2) is removed from the fixation rod 10, the fixation rod gripping device 90 needs to support the fixation rod 10 with a force equal to or greater than that of the support nut 15. For this reason, it is preferable that the height of the retaining portion 94 in the closed state be equal to or greater than that of the support nut 15, and that the blocks 91, 92 be made of the same type of metal, such as iron, as the support nut 15. With this configuration, an engagement length between the retaining portion 94 and the fixation rod 10 that is equal to or greater than the engagement length between the support nut 15 and the fixation rod 10 can be ensured, and the fixation rod gripping device 90 can support the fixation rod 10 with a supporting force equal to or greater than that of the support nut 15.

[0026] As shown in FIG. 6 , a closing portion 97 that closes the first block 91 and the second block 92 is provided on the opposite side of the holding portion 94 from the connecting member 93 side.

[0027] 7, the closing section 97 includes a lever 102 rotatably attached to the first block 91, a hook 103 rotatably attached to the lever 102, and a receiver 104 fixed to the second block 92. When the hook 103 hooked on the receiver 104 is pulled by rotating the lever 102, the tension of the hook 103 closes the first block 91 and the second block 92.

[0028] The closing portion 97 further includes a locking portion 98. The locking portion 98 is, for example, a cylinder pin and has the function of maintaining the closed state of the holding portion 94. Specifically, a first locking hole 106 provided in a fixed substrate 105 that is fixed to the first block 91 and that rotatably attaches the lever 102 to the first block 91 overlaps with a second locking hole 107 provided in the lever 102 to form an integrated through-hole when the holding portion 94 is in the closed state. The locking portion 98 is inserted through this integrated through-hole, thereby preventing the lever 102 from rotating and maintaining the holding portion 94 in the closed state.

[0029] The usage state of the fixed rod gripping device 90 will be described with reference to Figures 8 to 10. Figures 8 to 10 are enlarged views of the rope stopper showing the usage state of the fixed rod gripping device, which is one example of an embodiment.

[0030] As shown in Figure 8, when removing the existing fixed rod 10 from the rod support 40 during the main rope 7 replacement work, the fixed rod 10 is pulled up to separate the coil spring 13 and the support nut 15, and a fixed rod holding device 90 is attached between the support nut 15 and the support nut side spring receiving member 14 placed on the coil spring 13.

[0031] Next, as shown in Figure 9, the support nut 15 (see Figure 8) is removed from the male thread portion 16 of the existing fixation rod 10. When the fixation rod gripping device 90 attached to the existing fixation rod 10 is in the closed state, the locking portion 96 of the fixation rod gripping device 90 engages with the male thread portion 16 of the existing fixation rod 10, and has the effect of preventing axial movement of the existing fixation rod 10 even when the support nut 15 is removed. By using the fixation rod gripping device 90, the conventional process of a worker holding the fixation rod 10 with one hand to prevent axial movement of the existing fixation rod 10 after removing the support nut 15 is no longer necessary.

[0032] 10 , one end of the rod guide rope 78 is connected via a rod guide rope wire 77 inserted into a split pin hole 18 provided at the upper end of the existing fixed rod 10. Thereafter, the fixed rod holding device 90 is removed from the fixed rod 10, and the existing fixed rod 10 is pulled out of the rod support 40 through the opening 41 while the rod guide rope 78 is being let out, thereby removing the existing main rope 7 from the rod support 40.

[0033] On the other hand, when attaching a new fixed rod 10 to the rod support 40 during the work of replacing the main rope 7, first, one end of the rod guide rope 78 is connected to the upper end of the fixed rod 10 via the rod guide rope wire 77 below the rod support 40. Then, the rod guide rope 78 is pulled up to the upper side of the rod support 40 through the opening 41, and the new fixed rod 10 is inserted through the rod support-side spring receiving member 12, coil spring 13, and support nut-side spring receiving member 14, in that order, until it protrudes above the rod support 40. The worker attaches a fixed rod gripping device 90 to the male thread portion 16 of the fixed rod 10.

[0034] When the fixed rod holding device 90 attached to the new fixed rod 10 is in the closed state, the locking portion 96 of the fixed rod holding device 90 engages with the male thread portion 16 of the existing fixed rod 10, and has the effect of preventing axial movement of the new fixed rod 10 without the need for an operator to grasp it. By using the fixed rod holding device 90, the conventional process of having an operator grasp the fixed rod 10 with one hand to prevent axial movement of the new fixed rod 10 after pulling the new fixed rod 10 up to the upper side of the rod support 40 through the opening 41 is no longer necessary.

[0035] Next, the rod guide rope 78 and the rod guide rope wire 77 are removed from the upper end of the fixed rod 10, and a support nut 15 is attached to the male thread portion 16 of the fixed rod 10. The fixed rod holding device 90 is removed from the fixed rod 10, and the fixed rod 10 is supported by the rod support 40 via the coil spring 13, allowing the new main rope 7 to be attached to the rod support 40.

[0036] A method for replacing the main rope of a 2:1 roping elevator using a fixed rod gripping device 90 will be described using Figures 11 to 17. Figure 11 is a flow diagram showing the method for replacing the main rope of a 2:1 roping elevator. Figure 12 is a diagram showing a schematic configuration for explaining the method for replacing the main rope of a 2:1 roping elevator. Figures 13 and 14 are diagrams showing a schematic configuration for explaining the removal of an existing fixed rod in a method for replacing a main rope using a fixed rod gripping device, which is one example of an embodiment.

[0037] Fig. 15 is a diagram showing a schematic configuration for explaining an intermediate state of a main rope replacement method using a fixed rod gripping device according to an embodiment. Fig. 16 is a diagram showing a schematic configuration for explaining attachment of a new fixed rod in a main rope replacement method using a fixed rod gripping device according to an embodiment. Fig. 17 is a diagram showing a schematic configuration for explaining attachment of a new fixed rod and a completed state of a main rope replacement method using a fixed rod gripping device according to an embodiment.

[0038] As shown in Figure 11, when replacing the main rope of a 2:1 rope elevator, first, the car 2 and counterweight 3 are fixed in the hoistway 1 (Figure 11 S1). Specifically, as shown in Figure 12, a counterweight fixing jig 32 is installed at the bottom of the hoistway 1 to fix the counterweight 3. Scaffolding 33 is installed near the fixed counterweight 3. The car 2 is fixed in the hoistway 1 at a position where the top surface of the car 2 is flush with the top floor landing 22 using a fixing jig (not shown), such as a sling rope or chain block.

[0039] In preparation for other equipment, a winch 42 is installed in the machine room 4.

[0040] The workers are arranged as, but not limited to, a car worker 25 on top of the car 2, a machine room worker 26 in the machine room 4, a bottom floor worker 27 at the bottom floor landing 23, and a top floor worker 28 at the top floor landing 22. It is preferable that a fence 24 is installed above the car 2.

[0041] The existing main rope 71 is indicated by a dashed line. The existing main rope 71 is wound around each pulley in the machine room 4 and the hoistway 1 through openings 41 provided in the rod support 40. The existing main rope 71 is cut at cutting points 73, 74, 75, and 76 and then recovered. The existing main ropes 71 cut at each cutting point are referred to as existing main ropes 71-1 to 71-5, respectively, and the fixed rods 10 connected to the ends of the existing main ropes 71-3 and 71-4 are referred to as existing fixed rods 61 and 62, respectively.

[0042] The new main rope 72 is installed at the top floor landing 22. At the top floor landing 22 and the bottom floor landing 23, an existing main rope take-up drum 82 for the top floor and an existing main rope take-up drum 83 for the bottom floor are installed to retrieve the existing main rope 71, completing preparations for replacing the main rope.

[0043] Next, the existing main rope 71 that was stretched across the middle of the hoistway 1 on the side of the counterweight 3 is retrieved (FIG. 11 S2). Specifically, as shown in FIG. 12, the existing main rope 71-1 that was cut at cutting points 73 and 74 and the existing main rope 71-2 that was cut at cutting points 73 and 75 are connected to the winch rope 44 that is connected to the winch 42 via a connecting jig such as a shackle (not shown), and lowered to the vicinity of the lowest floor landing 23, where the lowest floor worker 27 winds and retrieves the existing main rope for the lowest floor onto the existing main rope winding drum 83.

[0044] Next, the fixed rod gripping device 90 is used to remove the existing fixed rods 61 and 62 from the rod supports 40 (FIG. 11, S3). Specifically, as shown in FIG. 13, the fixed rod gripping device 90 is attached to the existing fixed rod 61, and the support nut 15 (see FIG. 8) is removed, and then one end of the rod guide rope 78 is connected to the upper end of the existing fixed rod 61 via the rod guide rope wire 77.

[0045] Thereafter, the fixed rod gripping device 90 is removed from the existing fixed rod 61, and while the rod guide rope 78 is being let out, the existing fixed rod 61 is pulled out from the rod support body 40 through the opening 41, and the existing main rope 71-3 is removed from the rod support body 40. The existing main rope 71-3 that has been sent out to the top floor landing 22 by the car worker 25 is wound onto the top floor existing main rope take-up drum 82 and collected by the top floor worker 28.

[0046] Next, as shown in Figure 14, the car worker 25 cuts the existing main rope 71 at the cutting point 76. The machine room worker 26 attaches the fixed rod gripping device 90 to the existing fixed rod 62 in the same manner as for the existing fixed rod 61 (see Figure 13), removes the support nut 15 (see Figure 8), and then connects one end of the rod guide rope 78 to the upper end of the existing fixed rod 62 via the rod guide rope wire 77.

[0047] Thereafter, the fixed rod gripping device 90 is removed from the existing fixed rod 62, and while the rod guide rope 78 is being let out, the existing fixed rod 62 is pulled out from the rod support body 40 through the opening 41, and the existing main rope 71-4 is removed from the rod support body 40. At the top floor landing 22, the top floor worker 28 winds up and recovers the existing main rope 71-4 onto the top floor existing main rope winding drum 82.

[0048] The car worker 25 connects the end of the existing main rope 71-5 on the side of the cut point 76 to the end of the new main rope 72 via a connecting jig 79 (see S4 in Figure 11 and Figure 15).

[0049] Next, the new main rope 72 is wound and the intermediate portion of the existing main rope 71-5 on the car 2 side is retrieved ( S5 in FIG. 11 ). As shown in FIG. 15 , at the top floor landing 22, the top floor worker 28 winds the existing main rope 71-5 onto the existing top floor main rope take-up drum 82. At the same time, the machine room worker 26 winds the new main rope 72, which has been connected to the existing main rope 71-5 and fed into the machine room 4, onto the sheave 51 and the deflector sheave 6, respectively, and lowers it through the opening 41 to above the car 2. The car worker 25 removes the connecting jig 79 and separates the existing main rope 71-5 from the new main rope 72. Then, at the top floor landing 22, the top floor worker 28 winds the existing main rope 71-5 onto the existing top floor main rope take-up drum 82, completing the retrieval of the existing main rope 71.

[0050] 16, the car-mounted worker 25 then unwinds the end of the new main rope 72 to the vicinity of the counterweight 3. The bottom floor worker 27 passes the new main rope 72 through the counterweight pulley 31, completing the winding of the new main rope 72.

[0051] Next, using the fixed rod gripping device 90, the new fixed rod 63 connected to the end of the new main rope 72 and the new fixed rod 64, which will be described later in FIG. 17 , are attached to the rod support 40 ( FIG. 11 S6). The lowest floor worker 27 connects the rope socket 8 to the end of the new main rope 72 and connects the new fixed rod 63 to the opening on the opposite side of the rope socket 8. The machine room worker 26 pays out the winch rope 44 connected to the winch 42 to the vicinity of the counterweight 3, and the lowest floor worker 27 connects the winch rope 44 to the new fixed rod 63 via a connecting jig (not shown) such as a shackle. The machine room worker 26 winds up the winch rope 44 with the winch 42 and pulls the new fixed rod 63 up to the vicinity of the rod support 40.

[0052] The car worker 25 connects one end of a rod guide rope 78 to the upper end of the newly installed fixed rod 63 via a wire 77 for the rod guide rope.

[0053] As shown in Figure 16, the machine room worker 26 pulls up the rod guide rope 78 through the opening 41, causing the new fixed rod 63 to protrude above the rod support 40. A fixed rod holding device 90 is attached to the new fixed rod 63, and the rod guide rope 78 and the rod guide rope wire 77 are removed from the upper end of the new fixed rod 63. After attaching a support nut 15 (see Figure 8) above the fixed rod holding device 90, the fixed rod holding device 90 is removed, thereby supporting the new fixed rod 63 on the rod support 40 and attaching the new main rope 72 to the rod support 40.

[0054] As shown in FIG. 17 , the car worker 25 connects the rope socket 8 to the car 2-side end of the new main rope 72 and connects the new fixed rod 64 to the opposite opening of the rope socket 8. One end of the rod guide rope 78 is connected to the upper end of the new fixed rod 64 via a rod guide rope wire 77. The machine room worker 26 pulls up the rod guide rope 78 through the opening 41, causing the new fixed rod 64 to protrude above the rod support 40. A fixed rod holding device 90 is attached to the new fixed rod 64 and the rod guide rope 78 and the rod guide rope wire 77 are removed from the upper end of the new fixed rod 64. After attaching a support nut 15 (see FIG. 8 ) above the fixed rod holding device 90, the new fixed rod 64 is supported by the rod support 40 and the new main rope 72 is attached to the rod support 40.

[0055] After both ends of the new main rope 72 are supported by the rod supports 40, the winch 42 and other devices are withdrawn. The counterweight fixing jig 32, the scaffolding 33, and the fixing jig (not shown) for the car 2 are withdrawn, and the car 2 and counterweight 3 are released from their fixed state, thereby completing the series of operations of withdrawing the existing main rope 71 (see FIG. 12) and replacing it with the new main rope 72 (FIG. 11, S7).

[0056] As described above, the method of using the fixed rod holding device 90 to recover the existing main rope 71 and replace it with the new main rope 72 specifically includes the following steps: (1) a step of lifting up the existing fixed rods 61, 62 to separate the coil spring 13 from the support nut 15, and attaching the fixed rod holding device 90 between the coil spring 13 and the support nut 15, (2) a step of removing the support nut 15 from the male threaded portion 16 of the existing fixed rods 61, 62, connecting one end of the rod guide rope 78 to the upper end of the existing fixed rods 61, 62 via the rod guide rope wire 77, and then removing the fixed rod holding device 90 from the existing fixed rods 61, 62, and pulling out the existing fixed rods 61, 62 from the rod support body 40 while letting out the rod guide rope 78, and removing the existing main rope 71 from the rod support body 40, (3) A process of connecting one end of a rod guide rope 78 to the upper end of the newly installed fixed rods 63, 64 via a wire 77 for the rod guide rope, then pulling the rod guide rope 78 up to the rod support 40 and attaching a fixed rod holding device 90 to the newly installed fixed rods 63, 64 via a coil spring 13; (4) A process of removing the rod guide rope 78 and the wire 77 for the rod guide rope from the upper end of the newly installed fixed rods 63, 64 and attaching a support nut 15 to the male threaded portion 16 of the newly installed fixed rods 63, 64; (5) A process of removing the fixed rod holding device 90 from the newly installed fixed rods 63, 64, supporting the newly installed fixed rods 63, 64 on the rod support 40 via the coil spring 13, and attaching the new main rope 72 to the rod support 40.

[0057] By using the fixed rod gripping device 90 having the above configuration, axial movement of the fixed rod 10 is prevented, so when replacing the elevator's main rope, the worker does not need to hold the fixed rod 10 with one hand while using the other hand to perform tasks such as tightening and loosening the support nut 15. After gripping the fixed rod 10 with the fixed rod gripping device 90, the worker can use both hands to tighten and loosen the support nut 15 and attach and remove the rod guide rope 78, making main rope replacement easier.

[0058] The above embodiment may be modified as needed within the scope of the present invention. For example, the male thread portion 16 of the fixing rod 10 may be provided at both ends or over the entire length of the fixing rod 10 so that the fixing rod 10 can be used without having to consider the upper and lower ends.

[0059] DESCRIPTION OF SYMBOLS 1 Hoistway, 2 Car, 3 Counterweight, 4 Machine room, 5 Hoist, 6 Deflector, 7 Main rope, 8 Rope socket, 9 Rope stopper, 10 Fixed rod, 11 Rod pin, 12 Rod support side spring receiving member, 13 Coil spring, 14 Support nut side spring receiving member, 15 Support nut, 16 Male threaded portion, 21 Car pulley, 22 Top floor landing, 23 Bottom floor landing, 25 Car worker, 26 Machine room worker, 27 Bottom floor worker, 28 Top floor worker, 31 Counterweight pulley, 32 Counterweight fixing jig, 33 Scaffolding, 40 Rod support, 41 Opening, 42 Electric winch, 51 Sheave, 61, 62 Existing fixed rod, 63, 64 New fixed rod, 71 Existing main rope, 72 New main rope, 73-76 Cutting point, 77 Wire for rod guide rope, 78 Rod guide rope, 81 Rope fixing jig, 82 Existing main rope take-up drum for top floor, 83 Existing main rope take-up drum for bottom floor, 90 Fixed rod gripping device, 91 First block, 92 Second block, 93 Connecting member, 94 Holding portion, 95 Through hole, 96 Locking portion, 97 Closing portion, 98 Locking portion

Claims

1. A fixed rod gripping device for an elevator in which a fixed rod connected to the end of an elevator main rope is supported by a support nut via a coil spring on a rod support provided in a hoistway, which grips the fixed rod between the support nut and the coil spring when removing or attaching the fixed rod to the rod support, the device comprising: a holding section including a first block and a second block connected by a connecting member so that the first block and the second block can be opened and closed horizontally; when the holding section is in a closed state, a through hole through which the fixed rod can pass is provided on the joint surface of the first block and the second block, and a locking section is formed in the through hole which engages with a male threaded section provided on the outer periphery of the fixed rod to prevent axial movement of the fixed rod; and a closing section for closing the first block and the second block is provided on the side of the holding section opposite the connecting member.

2. The fixed rod gripping device described in claim 1, characterized in that the closing section comprises a lever rotatably attached to the first block, a hook rotatably attached to the lever, and a receiver fixed to the second block, and the hook hung on the receiver is pulled by rotating the lever, and the first block and the second block are closed by the tension of the hook.

3. The fixed rod gripping device described in claim 2, characterized in that the closing portion further comprises a locking portion for maintaining the holding portion in a closed state, the locking portion being fixed to the first block and inserted through a first locking hole provided in a fixed base for rotatably mounting the lever to the first block and a second locking hole provided in the lever when the holding portion is in the closed state, thereby preventing the lever from rotating.

4. A fixed rod holding device as described in claim 1, characterized in that the engaging portion is a female threaded portion provided on the inner circumference of the through hole which engages with the male threaded portion provided on the outer circumference of the fixed rod.

5. A method for replacing an elevator main rope using the fixed rod gripping device according to claim 1, comprising the steps of: lifting up the existing fixed rod to separate the coil spring and the support nut, and attaching the fixed rod gripping device between the coil spring and the support nut, in order to remove the existing fixed rod connected to the end of the existing main rope from the rod support; removing the support nut from the male threaded portion of the existing fixed rod, connecting one end of a rod guide rope to the upper end of the existing fixed rod via a rod guide rope wire, and then removing the fixed rod gripping device from the existing fixed rod, extracting the existing fixed rod from the rod support while letting out the rod guide rope, and removing the existing main rope from the rod support; and attaching a new fixed rod connected to the end of a new main rope to the rod support, 1. A method for replacing a main rope in an elevator, comprising the steps of: connecting one end of the rod guide rope to an upper end of the newly installed fixed rod via a wire for the rod guide rope, pulling the rod guide rope up to the upper side of the rod support, and attaching the fixed rod holding device to the newly installed fixed rod via the coil spring; removing the rod guide rope and the wire for the rod guide rope from the upper end of the newly installed fixed rod and attaching the support nut to the male thread portion of the newly installed fixed rod; and removing the fixed rod holding device from the newly installed fixed rod, supporting the newly installed fixed rod on the rod support via the coil spring, and attaching the new main rope to the rod support.

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