Elevators and methods for their renovation

Abstract

To provide an elevator which facilitates update work of a hoist, and a repair method thereof.SOLUTION: A drive device 40 includes a second hoist 41 and a transmission mechanism 42. The second hoist 41 includes a second hoist body 44 and an input side rotor 43. The second hoist body 44 rotates the input side rotor 43. The transmission mechanism 42 mechanically transmits the rotation of the input side rotor 43 to a drive sheave 26.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an elevator and a method for modifying the same.

Background Art

[0002] In a conventional elevator device with an upper machine room, a machine base is provided in the machine room. Two hoisting machines are installed on the machine base with a gap between them. Hoisting ropes are wound around the two hoisting machines (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional elevator device as described above, when replacing the two hoisting machines with new hoisting machines respectively, in order to remove the two hoisting machines from the machine base, it is necessary to make the tension on the hoisting ropes disappear. For this reason, it is necessary to support the counterweight by the buffer in the hoistway pit and suspend the car by a chain block, which takes time and effort in the work.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain an elevator and a method for modifying the same that can easily perform the renewal work of the hoisting machine.

Means for Solving the Problems

[0006] The machine-room-less elevator according to this disclosure comprises a first hoisting machine having a first hoisting machine body and a drive sheave rotatably connected to the first hoisting machine body, a suspension body wrapped around the drive sheave, a car suspended in the hoistway by the suspension body on one side relative to the drive sheave, a counterweight suspended in the hoistway by the suspension body on the other side relative to the drive sheave, and a drive device that raises and lowers the car and the counterweight by rotating the drive sheave, the drive device having a second hoisting machine and a transmission mechanism, the second hoisting machine having an input side rotating body and a second hoisting machine body that rotates the input side rotating body, and the transmission mechanism mechanically transmits the rotation of the input side rotating body to the drive sheave. The elevator modification method relating to this disclosure includes the steps of: attaching a sheave-side rotating body to an existing hoisting machine so that the sheave-side rotating body rotates together with the drive sheave while the suspension body that suspends the elevator car remains wrapped around the drive sheave of the existing hoisting machine; and installing a new hoisting machine to which an input-side rotating body is attached within the installation space where the existing hoisting machine is installed, and mechanically connecting the input-side rotating body and the sheave-side rotating body so that the rotation of the input-side rotating body is transmitted to the sheave-side rotating body. [Effects of the Invention]

[0007] According to this disclosure, the replacement work of the hoisting machine can be easily performed. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the elevator before renovation according to Embodiment 1. [Figure 2] This is a perspective view showing the elevator after modification according to Embodiment 1. [Figure 3] Figure 2 is a side view showing the first hoisting machine and drive unit. [Figure 4] Figure 3 is a front view showing the input side rotating body and the sheave side rotating body. [Figure 5] Figure 3 is an exploded perspective view showing the drive sheave and transmission mechanism. [Figure 6]This is a side view showing a modified example of the transmission mechanism of Embodiment 1. [Figure 7] Figure 6 is a front view showing the input side rotating body, the sheave side rotating body, and the chain. [Figure 8] Figure 2 is a plan view showing a first example of the support structure for the drive unit. [Figure 9] This is a plan view showing a second example of the support structure for the drive unit shown in Figure 2. [Figure 10] This is a left side view showing the main parts of Figure 9. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. Embodiment 1. Figure 1 is a perspective view showing the elevator before modification according to Embodiment 1. The elevator in Embodiment 1 is a 2:1 roping type machine room-less elevator.

[0010] In the diagram, a car buffer base 12 and a counterweight buffer base 13 are fixed to the bottom 11a of the elevator shaft 11. A car buffer 14 is installed on the car buffer base 12. A counterweight buffer 15 is installed on the counterweight buffer base 13.

[0011] Multiple guide rails are installed within the elevator shaft 11. These multiple guide rails include a first car guide rail 16, a second car guide rail 17, a first counterweight guide rail 18, and a second counterweight guide rail 19.

[0012] The lower ends of the first cage guide rail 16 and the second cage guide rail 17 are placed on the cage buffer base 12. The lower ends of the first counterweight guide rail 18 and the second counterweight guide rail 19 are placed on the counterweight buffer base 13.

[0013] The car 21 is provided between the first car guide rail 16 and the second car guide rail 17. Further, the car 21 is guided by the first car guide rail 16 and the second car guide rail 17 and moves up and down in the hoistway 11.

[0014] The counterweight 22 is provided between the first counterweight guide rail 18 and the second counterweight guide rail 19. Further, the counterweight 22 is guided by the first counterweight guide rail 18 and the second counterweight guide rail 19 and moves up and down in the hoistway 11.

[0015] The lifting area of the counterweight 22 is located behind the lifting area of the car 21 when viewed from the landing.

[0016] A machine table 23 is fixed between the car buffer base 12 and the counterweight buffer base 13. A first hoist 24, which is an existing hoist, is installed on the machine table 23. That is, the first hoist 24 is installed at the bottom 11a of the hoistway 11. The installation space in the first embodiment is the space within the hoistway 11.

[0017] The first hoist 24 is a drum-length cylindrical hoist. The drum-length cylindrical hoist is a hoist in which the axial dimension is larger than the dimension in the direction perpendicular to the axial direction.

[0018] The first hoist 24 has a first hoist main body 25 and a drive sheave 26. The first hoist main body 25 has a first hoist motor (not shown) and a first hoist brake (not shown).

[0019] The first hoist motor rotates the drive sheave 26. The first hoist brake holds the drive sheave 26 in a stationary state. Further, the first hoist brake brakes the rotation of the drive sheave 26.

[0020] A suspension body 27 is wound around the drive sheave 26. As the suspension body 27, a plurality of ropes or a plurality of belts are used.

[0021] The elevator car 21 and the counterweight 22 are suspended within the elevator shaft 11 by the suspension body 27. The elevator car 21 and the counterweight 22 move up and down within the elevator shaft 11 by the rotation of the drive sheave 26.

[0022] A first cage suspension wheel 28 and a second cage suspension wheel 29 are provided at the bottom of the cage 21. A counterweight suspension wheel 30 is provided at the top of the counterweight 22.

[0023] A first rope fastener 31 is attached to the upper end of the first car guide rail 16. A first upper beam 32 and a second upper beam 33 are positioned at the top of the elevator shaft 11. The first upper beam 32 is fixed to the upper end of the first counterweight guide rail 18 and the upper end of the second counterweight guide rail 19. The second upper beam 33 is fixed to the first upper beam 32 and the upper end of the second car guide rail 17.

[0024] The second upper beam 33 supports the basket return wheel 34. The first upper beam 32 supports the counterweight return wheel 35 and the second rope fastener 36.

[0025] The suspension body 27 has a first end 27a and a second end 27b. The first end 27a is connected to the first rope fastener 31. The second end 27b is connected to the second rope fastener 36.

[0026] Furthermore, the suspension body 27 is wrapped around the first cage suspension wheel 28, the second cage suspension wheel 29, the cage return wheel 34, the drive sheave 26, the counterweight return wheel 35, and the counterweight suspension wheel 30 in order from the first end 27a side, and reaches the second end 27b.

[0027] Figure 2 is a perspective view showing the elevator after modification according to Embodiment 1. In the modified elevator, a drive unit 40 is newly installed in the hoistway 11. When viewed along the vertical direction of the hoistway 11, the drive unit 40 overlaps with the first hoisting machine 24.

[0028] Furthermore, the drive unit 40 raises and lowers the cage 21 and the counterweight 22 by rotating the drive sheave 26.

[0029] The existing first hoisting machine 24 remains installed on the machine base 23. The existing suspension body 27 remains wrapped around the drive sheave 26. As a result, the condition in which the first hoisting machine 24 bears the upward pulling load that the drive sheave 26 receives from the suspension body 27 is maintained even after the modification.

[0030] In the refurbished elevator, the drive unit 40 rotates the drive sheave 26, so the first hoisting machine motor may be removed from the first hoisting machine body 25.

[0031] The stationary position of the drive sheave 26 and the braking of its rotation may be performed by the existing first hoisting machine brake. Alternatively, the first hoisting machine brake may be removed from the first hoisting machine body 25, and a new hoisting machine brake may be installed on the drive unit 40.

[0032] For other equipment, the existing equipment is being used as is.

[0033] Figure 3 is a side view showing a partial cross-section of the first hoisting machine 24 and drive unit 40 shown in Figure 2. The specific support structure of the drive unit 40 will be described later.

[0034] The drive unit 40 includes a new hoisting machine, the second hoisting machine 41, and a transmission mechanism 42. The second hoisting machine 41 is a long-bodied cylindrical hoisting machine. Furthermore, when viewed along the vertical direction of the hoistway 11, the second hoisting machine 41 overlaps with the first hoisting machine 24. In this example, the second hoisting machine 41 is positioned directly above the first hoisting machine 24.

[0035] Furthermore, the second hoisting machine 41 includes an input-side rotating body 43 and a second hoisting machine body 44. The second hoisting machine body 44 has a second hoisting machine motor (not shown). The second hoisting machine motor rotates the input-side rotating body 43.

[0036] The rotation axis of the input-side rotating body 43 is parallel and horizontal to the rotation axis of the drive sheave 26. Furthermore, the rotation axis of the input-side rotating body 43 is located directly above the rotation axis of the drive sheave 26.

[0037] The transmission mechanism 42 mechanically transmits the rotation of the input-side rotating body 43 to the drive sheave 26. The transmission mechanism 42 also includes a sheave-side rotating body 45 and a plurality of gripping devices 46.

[0038] The sheave-side rotating body 45 is attached to the drive sheave 26 via a plurality of gripping devices 46. As a result, the sheave-side rotating body 45 rotates together with the drive sheave 26 around the drive sheave 26's axis of rotation. Furthermore, the sheave-side rotating body 45 is positioned on the opposite side of the drive sheave 26 from the first hoisting machine body 25.

[0039] Figure 4 is a front view showing the input-side rotating body 43 and the sheave-side rotating body 45 in Figure 3. In this example, gears are used as the input-side rotating body 43 and the sheave-side rotating body 45, respectively. The input-side rotating body 43 is directly meshed with the sheave-side rotating body 45.

[0040] Furthermore, the diameter of the sheave-side rotating body 45 is larger than the diameter of the input-side rotating body 43. In other words, the transmission mechanism 42 reduces the rotation of the input-side rotating body 43 and transmits it to the drive sheave 26.

[0041] Figure 5 is an exploded perspective view showing the drive sheave 26 and transmission mechanism 42 of Figure 3. The drive sheave 26 has an annular winding portion 26a, a boss portion 26b, and a plurality of connecting portions 26c.

[0042] The suspension body 27 is wrapped around the outer circumference of the wrapping portion 26a. The boss portion 26b is located at the center of the wrapping portion 26a.

[0043] Multiple connecting sections 26c are provided between the winding section 26a and the boss section 26b, connecting the winding section 26a and the boss section 26b. Each connecting section 26c is provided along the radial direction of the drive sheave 26. The radial direction of the drive sheave 26 is perpendicular to the axis of rotation of the drive sheave 26.

[0044] Furthermore, each connecting portion 26c is arranged at equal intervals from one another in the circumferential direction of the drive sheave 26. The circumferential direction of the drive sheave 26 is the direction along the circumference centered on the axis of rotation of the drive sheave 26. The drive sheave 26 is provided with multiple openings 26d. Each opening 26d is provided between two adjacent connecting portions 26c.

[0045] The sheave-side rotating body 45 is provided with a plurality of first drill holes 45a. The plurality of first drill holes 45a are provided on the same circumference centered on the rotation center of the sheave-side rotating body 45.

[0046] In this example, five sets of gripping devices 46 are used. Each gripping device 46 grips one of the multiple connecting parts 26c.

[0047] Each gripping device 46 has a spacer plate 47, a fixing plate 48, and several bolts 49. In this example, two bolts 49 are used for each gripping device 46. Therefore, a total of 10 bolts 49 are used for the transmission mechanism 42. However, in Figure 5, only one of the 10 bolts 49 is shown, and the remaining 9 are omitted.

[0048] Each spacer plate 47 is sandwiched between the connecting portion 26c and the sheave-side rotating body 45. Each fixing plate 48 is placed against the side of the connecting portion 26c opposite to the spacer plate 47.

[0049] Each spacer plate 47 is provided with a pair of second drill holes 47a. Each fixing plate 48 is provided with a pair of screw holes 48a.

[0050] In each gripping device 46, two bolts 49 are passed through two corresponding first drill holes 45a, a pair of second drill holes 47a in the corresponding spacer plate 47, and two openings 26d, and screwed into a pair of threaded holes 48a in the corresponding fixing plate 48.

[0051] Figure 6 is a side view showing a modified example of the transmission mechanism 42 of Embodiment 1 in partial cross-section. In this modified example, sprockets are used as the input-side rotating body 43 and the sheave-side rotating body 45, respectively. An annular chain 50 is wound around the input-side rotating body 43 and the sheave-side rotating body 45.

[0052] The rotation of the input-side rotating body 43 is transmitted to the sheave-side rotating body 45 via the chain 50. In a modified example, the transmission mechanism 42 includes the sheave-side rotating body 45, a plurality of gripping devices 46, and the chain 50.

[0053] Figure 7 is a front view showing the input-side rotating body 43, the sheave-side rotating body 45, and the chain 50 as in Figure 6. In Figure 7, the diameter of the sheave-side rotating body 45 is the same as that of the input-side rotating body 43. However, the diameter of the sheave-side rotating body 45 may be larger than the diameter of the input-side rotating body 43.

[0054] Figure 8 is a plan view showing a first example of the support structure of the drive unit 40 in Figure 2. A pair of additional beams 51 are provided within the hoistway 11. The second hoisting machine 41 is supported by the pair of additional beams 51. In this example, the second hoisting machine 41 is installed on the pair of additional beams 51.

[0055] Both ends of each additional beam 51 are fixed to the wall 11b of the elevator shaft 11 via multiple anchor bolts 52. The pair of additional beams 51 are arranged parallel and horizontally to each other. Furthermore, each additional beam 51 is positioned within the elevator shaft 11 to avoid interference with the portion of the suspension system 27 that extends upward from the drive sheave 26.

[0056] Figure 9 is a plan view showing a second example of the support structure of the drive unit 40 in Figure 2. Figure 10 is a left side view showing the main part of Figure 9. A pair of vertical columns 61 are erected at the bottom 11a of the elevator shaft 11. The lower end of each vertical column 61 is fixed to the bottom 11a via a number of anchor bolts 62.

[0057] A pair of crossbeams 63 are provided within the elevator shaft 11. The pair of crossbeams 63 are fixed between two of the multiple guide rails and a pair of vertical columns 61. In this example, the two guide rails are the first counterweight guide rail 18 and the second counterweight guide rail 19.

[0058] Furthermore, the pair of crossbeams 63 are arranged parallel and horizontal to each other. The first end of each crossbeam 63 is fixed to the first counterweight guide rail 18 or the second counterweight guide rail 19 by a plurality of rail clips 64. The second end of each crossbeam 63 is fixed to the vertical column 61 by bolting or welding.

[0059] Furthermore, the pair of crossbeams 63 are positioned within the elevator shaft 11 to avoid interference with the portion of the suspension body 27 that extends upward from the drive sheave 26.

[0060] A pair of support beams 65 are fixed between a pair of crossbeams 63. The second hoisting machine 41 is supported by the pair of support beams 65. In this example, the second hoisting machine 41 is installed on the pair of support beams 65.

[0061] A pair of support beams 65 are fixed to a pair of crossbeams 63 by welding. The pair of support beams 65 are also arranged parallel and horizontally to each other. Furthermore, each support beam 65 is positioned within the elevator shaft 11 to avoid interference with the portion of the suspension system 27 that extends upward from the drive sheave 26.

[0062] The elevator modification method according to Embodiment 1 includes a first step and a second step. In the first step, the sheave-side rotating body 45 is attached to the first hoisting machine 24 such that the sheave-side rotating body 45 rotates together with the drive sheave 26 while the suspension body 27 remains wrapped around the drive sheave 26.

[0063] In the second step, the second hoisting machine 41, to which the input-side rotating body 43 is attached, is installed in the same space where the first hoisting machine 24 is installed. Also in the second step, the input-side rotating body 43 and the sheave-side rotating body 45 are mechanically connected so that the rotation of the input-side rotating body 43 is transmitted to the sheave-side rotating body 45.

[0064] Furthermore, the installation space in Embodiment 1 is the space within the elevator shaft 11. In the second step, the second hoisting machine 41 is installed within the elevator shaft 11 such that, when viewed along the vertical direction of the elevator shaft 11, the second hoisting machine 41 overlaps with the first hoisting machine 24.

[0065] In such an elevator, the drive unit 40 includes a second hoisting machine 41 and a transmission mechanism 42. The second hoisting machine 41 includes a second hoisting machine body 44 and an input side rotating body 43. The second hoisting machine body 44 rotates the input side rotating body 43. The transmission mechanism 42 mechanically transmits the rotation of the input side rotating body 43 to the drive sheave 26.

[0066] Therefore, by adding the drive unit 40 while the suspension body 27 is still wrapped around the drive sheave 26, the hoisting machine used for raising and lowering the cage 21 can be easily switched from the first hoisting machine 24 to the second hoisting machine 41. Furthermore, there is no need to support the counterweight 22 with a counterweight buffer 15 or to suspend the cage 21 with a chain block. Consequently, the hoisting machine replacement work can be easily carried out, and the construction period for the replacement work can be shortened.

[0067] Furthermore, even if the mounting dimensions and external dimensions differ before and after the renovation, the hoisting machine can be easily replaced while reusing the existing equipment.

[0068] Furthermore, the first hoisting machine 24 and the drive unit 40 are installed within the hoistway 11. The second hoisting machine 41 overlaps with the first hoisting machine 24 when viewed along the vertical direction of the hoistway 11. Therefore, even within the hoistway 11, where dimensional constraints are severe, hoisting machine replacement work can be easily carried out.

[0069] Furthermore, the first hoisting machine 24 is installed at the bottom 11a of the elevator shaft 11. The second hoisting machine 41 is positioned above the first hoisting machine. This ensures that even after the modification, the first hoisting machine 24 receives the upward pulling load that the drive sheave 26 receives from the suspension body 27.

[0070] Therefore, the strength of the second hoisting machine 41 can be made lower than that of the first hoisting machine 24, allowing for a smaller second hoisting machine 41. This reduces the costs associated with replacing hoisting machines and promotes the replacement with the latest hoisting machines. Furthermore, by introducing the latest hoisting machines, it becomes easier to introduce the latest control and maintenance systems.

[0071] Furthermore, in the support structure shown in Figure 8, a pair of additional beams 51 are fixed to the wall 11b of the elevator shaft 11. The second hoisting machine 41 is then supported by the pair of additional beams 51. As a result, the second hoisting machine 41 can be firmly supported directly above the first hoisting machine 24 with a simple configuration.

[0072] Furthermore, according to the support structure shown in Figures 9 and 10, the second hoisting machine 41 can be firmly supported directly above the first hoisting machine 24 in a compact configuration by utilizing the first counterweight guide rail 18 and the second counterweight guide rail 19.

[0073] Furthermore, the transmission mechanism 42 reduces the rotation of the input rotating body 43 and transmits it to the drive sheave 26. This reduces the torque required for the second hoisting machine 41, and allows for miniaturization of the second hoisting machine 41.

[0074] Furthermore, the transmission mechanism 42 has a sheave-side rotating body 45. The sheave-side rotating body 45 is attached to the drive sheave 26. Therefore, the rotation of the input-side rotating body 43 can be transmitted to the drive sheave 26 more reliably.

[0075] Furthermore, the sheave-side rotating body 45 is attached to the drive sheave 26 via a plurality of gripping devices 46. Each gripping device 46 also grips the connecting portion 26c. Therefore, the existing drive sheave 26 can be used as is, and the sheave-side rotating body 45 can be attached to the drive sheave 26. This further shortens the construction period for the replacement work of the hoisting machine.

[0076] Furthermore, as shown in Figure 4, by using gears as the input-side rotating body 43 and the sheave-side rotating body 45, the rotation of the input-side rotating body 43 can be transmitted to the drive sheave 26 more reliably.

[0077] Furthermore, as shown in Figure 7, by providing a chain 50 between the input-side rotating body 43 and the sheave-side rotating body 45, the distance between the first hoisting machine 24 and the second hoisting machine 41 can be changed, thereby improving the degree of freedom in the installation position of the second hoisting machine 41.

[0078] Furthermore, in the elevator modification method of Embodiment 1, the sheave-side rotating body 45 is attached to the first hoisting machine 24 such that the sheave-side rotating body 45 rotates together with the drive sheave 26 while the suspension body 27 remains wrapped around the drive sheave 26. In addition, the second hoisting machine 41 is installed in the same installation space as the first hoisting machine 24. Furthermore, the input-side rotating body 43 and the sheave-side rotating body are mechanically connected so that the rotation of the input-side rotating body 43 is transmitted to the sheave-side rotating body 45.

[0079] Therefore, the hoisting machine used for raising and lowering the cage 21 can be easily switched from the first hoisting machine 24 to the second hoisting machine 41. Furthermore, there is no need to support the counterweight 22 with a counterweight buffer 15 or to suspend the cage 21 with a chain block. Consequently, the hoisting machine replacement work can be easily carried out, and the construction period for the replacement work can be shortened.

[0080] Furthermore, the second hoisting machine 41 is installed within the hoistway 11 such that it overlaps with the first hoisting machine 24 when viewed along the vertical direction of the hoistway 11. This makes it possible to easily replace the hoisting machines even within the hoistway 11, where dimensional constraints are severe.

[0081] The number of additional beams 51 may be one or three or more.

[0082] Furthermore, the second hoisting machine 41 may be supported by the additional beam 51 below the additional beam 51.

[0083] Furthermore, the number of support beams 65 may be one or three or more.

[0084] Furthermore, the second hoisting machine 41 may be supported by the support beam 65 below the support beam 65.

[0085] Furthermore, the first hoisting machine 24 may be installed at the top of the elevator shaft 11. In this case, the second hoisting machine 41 is positioned directly above or directly below the first hoisting machine 24.

[0086] Furthermore, the first hoisting machine 24 may be installed in the machine room. That is, the installation space for the first hoisting machine 24 may be the machine room. In an elevator with a machine room, the machine room is located above the hoistway 11.

[0087] Furthermore, the lifting and lowering area of ​​the counterweight 22 may be located to the side of the lifting and lowering area of ​​the elevator car 21, as viewed from the landing.

[0088] Furthermore, the first hoisting machine 24 and the second hoisting machine 41 may each be thin-type hoisting machines. A thin-type hoisting machine is a hoisting machine in which the axial dimension is smaller than the dimension in the direction perpendicular to the axial direction.

[0089] Furthermore, the type of elevator is not limited to the type shown in Figure 1; for example, a 1:1 roping system may also be used.

[0090] Furthermore, the elevator may be a double-deck elevator, a single-shaft multi-car elevator, or the like. The Futo Multi-Car system is a system in which the upper car and the lower car, located directly below the upper car, each move independently up and down a common elevator shaft.

[0091] Although preferred embodiments have been described in detail above, the invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0092] The various aspects of this disclosure are summarized below as an appendix.

[0093] (Note 1) A first hoisting machine having a first hoisting machine body and a drive sheave that is rotatable relative to the first hoisting machine body, The suspension body wrapped around the aforementioned drive sheave, A car suspended in the hoistway by the suspension body on one side relative to the drive sheave, A counterweight suspended in the elevator shaft by the suspension body on the other side of the drive sheave, and A drive device that raises and lowers the cage and the counterweight by rotating the drive sheave. Equipped with, The aforementioned drive device includes a second hoisting machine and a transmission mechanism. The aforementioned second hoisting machine has an input side rotating body and a second hoisting machine body that rotates the input side rotating body, The transmission mechanism is an elevator that mechanically transmits the rotation of the input rotating body to the drive sheave. (Note 2) The first hoisting machine and the drive unit are installed in the elevator shaft. The second hoisting machine is the elevator described in Appendix 1, which overlaps with the first hoisting machine when viewed along the vertical direction of the hoistway. (Note 3) The first hoisting machine is installed at the bottom of the elevator shaft. The second hoisting machine is the elevator described in Appendix 2, located directly above the first hoisting machine. (Note 4) An additional beam fixed to the wall of the elevator shaft to avoid interference with the aforementioned suspension system. Furthermore, The second hoisting machine is the elevator described in Appendix 3, supported by the additional beam. (Note 5) Multiple guide rails for guiding the raising and lowering of the cage and the counterweight, A pair of vertical columns erected at the bottom of the aforementioned elevator shaft, To avoid interference with the suspension body, a pair of horizontal beams are fixed between two of the multiple guide rails and the pair of vertical columns, and Support beam fixed between the pair of crossbeams to avoid interference with the suspension body. Furthermore, The second hoisting machine is the elevator described in Appendix 3, which is supported by the support beam. (Note 6) The transmission mechanism is an elevator according to any one of the items 1 to 5, which reduces the rotation of the input rotating body and transmits it to the drive sheave. (Note 7) The aforementioned transmission mechanism is A sheave-side rotating body attached to the drive sheave and rotating together with the drive sheave. An elevator that has any of the features described in one of the appendices 1 to 6. (Note 8) The aforementioned drive sheave is The aforementioned suspension body is wrapped around an annular wrapping portion, The boss portion located at the center of the aforementioned winding portion, A connecting portion provided between the aforementioned winding portion and the aforementioned boss portion It has, The elevator described in Appendix 7, wherein the sheave-side rotating body is attached to the drive sheave via a gripping device that grips the connecting portion. (Note 9) The process of attaching the sheave-side rotating body to the existing hoisting machine such that the suspension body from which the cage is suspended remains wrapped around the drive sheave of the existing hoisting machine, and the sheave-side rotating body rotates together with the drive sheave, and The process involves installing a new hoisting machine, to which an input-side rotating body is attached, within the same installation space as the existing hoisting machine, and mechanically connecting the input-side rotating body and the sheave-side rotating body so that the rotation of the input-side rotating body is transmitted to the sheave-side rotating body. Elevator renovation methods, including [specific details omitted]. (Note 10) The aforementioned installation space is the space within the elevator shaft. The elevator modification method described in Appendix 9, wherein the new hoisting machine is installed in the hoistway such that, when viewed along the vertical direction of the hoistway, the new hoisting machine overlaps with the existing hoisting machine. [Explanation of Symbols]

[0094] 11 Hoistway, 11a Bottom, 11b Wall, 16 First car guide rail, 17 Second car guide rail, 18 First counterweight guide rail, 19 Second counterweight guide rail, 21 Car, 22 Counterweight, 24 First hoisting machine (existing hoisting machine), 25 First hoisting machine body, 26 Drive sheave, 26a Winding section, 26b Boss section, 26c Connecting section, 27 Suspension body, 40 Drive device, 41 Second hoisting machine (new hoisting machine), 42 Transmission mechanism, 43 Input side rotating body, 44 Second hoisting machine body, 45 Sheave side rotating body, 46 Gripping device, 51 Additional beam, 61 Vertical column, 63 Horizontal beam, 65 Support beam.

Claims

1. A first hoisting machine having a first hoisting machine body and a drive sheave that is rotatable relative to the first hoisting machine body, The suspension body wrapped around the aforementioned drive sheave, A car suspended in the hoistway by the suspension body on one side relative to the drive sheave, A counterweight suspended in the elevator shaft by the suspension body on the other side of the drive sheave, and A drive device that raises and lowers the cage and the counterweight by rotating the drive sheave. Equipped with, The aforementioned drive device includes a second hoisting machine and a transmission mechanism. The first hoisting machine and the drive unit are installed in the elevator shaft. The second hoisting machine overlaps with the first hoisting machine when viewed along the vertical direction of the elevator shaft. The aforementioned second hoisting machine comprises an input-side rotating body and a second hoisting machine body that rotates the input-side rotating body. The transmission mechanism is an elevator that mechanically transmits the rotation of the input rotating body to the drive sheave.

2. The first hoisting machine is installed at the bottom of the elevator shaft. The elevator according to claim 1, wherein the second hoisting machine is positioned directly above the first hoisting machine.

3. An additional beam fixed to the wall of the elevator shaft to avoid interference with the aforementioned suspension system. Furthermore, The elevator according to claim 2, wherein the second hoisting machine is supported by the additional beam.

4. Multiple guide rails for guiding the raising and lowering of the cage and the counterweight, A pair of vertical columns erected at the bottom of the aforementioned elevator shaft, To avoid interference with the suspension body, a pair of horizontal beams are fixed between two of the multiple guide rails and the pair of vertical columns, and Support beam fixed between the pair of crossbeams to avoid interference with the suspension body. Furthermore, The elevator according to claim 2, wherein the second hoisting machine is supported by the support beam.

5. The elevator according to any one of claims 1 to 4, wherein the transmission mechanism reduces the rotation of the input side rotating body and transmits it to the drive sheave.

6. The aforementioned transmission mechanism is A sheave-side rotating body attached to the drive sheave and rotating together with the drive sheave. An elevator according to any one of claims 1 to 4, having the following:

7. The aforementioned drive sheave is The aforementioned suspension body is wrapped around an annular wrapping portion, The boss portion located at the center of the aforementioned winding portion, A connecting portion provided between the aforementioned winding portion and the aforementioned boss portion It has, The elevator according to claim 6, wherein the sheave-side rotating body is attached to the drive sheave via a gripping device that grips the connecting portion.

8. The process of attaching the sheave-side rotating body to the existing hoisting machine such that the suspension body from which the cage is suspended remains wrapped around the drive sheave of the existing hoisting machine, and the sheave-side rotating body rotates together with the drive sheave, and The process involves installing a new hoisting machine, to which an input-side rotating body is attached, within the same installation space as the existing hoisting machine, and mechanically connecting the input-side rotating body and the sheave-side rotating body so that the rotation of the input-side rotating body is transmitted to the sheave-side rotating body. Includes, The aforementioned installation space is the space within the elevator shaft. A method for modifying an elevator, comprising installing the new hoisting machine in the elevator shaft such that, when viewed along the vertical direction of the elevator shaft, the new hoisting machine overlaps with the existing hoisting machine.

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