Elevator car under-cab inspection scaffolding

Abstract

This provides an elevator car undercarriage inspection platform with a simple configuration that allows space to be secured for the suspension device to stop the elevator car during normal operation, and also allows easy access to the underside of the elevator car during inspections. [Solution] The elevator counterweight device according to the embodiment includes an inspection platform below the car, comprising a plurality of engaging bodies, a first base, a first scaffolding board supported on the first base, a first fixing device supported on the first base and capable of engaging with the engaging bodies, a second fixing device positioned higher than the first fixing device and capable of engaging with the engaging bodies, and an extension device. The extension device is an extension device that can extend and retract in the vertical direction, and the vertical distance between the first fixing device and the second fixing device is adjustable.

Description

Technical Field

[0001] The embodiment relates to an inspection platform under the elevator car.

Background Art

[0002] A buffer is installed on the bottom surface of the hoistway of the elevator to prevent the car from colliding with the bottom surface of the hoistway when the car descends beyond the lowest position unexpectedly. When the operating speed of the car during normal operation is high, the impact energy that the buffer should absorb increases, so the stroke of the buffer also increases. Therefore, the depth of the bottom of the hoistway increases as the operating speed of the car increases.

[0003] During maintenance and inspection of the car, it may be necessary to inspect the equipment installed on the lower surface of the car. In this case, access is made from the bottom of the hoistway to the lower surface of the car for work.

[0004] [[ID=第十九]] As described above, when the operating speed of the car is high, since the bottom of the hoistway is deep, it may be difficult to access the lower surface of the car from the bottom of the hoistway. Therefore, an inspection platform is permanently installed at the bottom of the hoistway, or an inspection platform that can move vertically below the car is attached to the car.

[0005] However, when the inspection platform is permanently installed, the vertical distance between the car located at the lowest position and the inspection platform may be shortened. This causes a problem that it becomes difficult to secure a space for stopping the car descending beyond the lowest position in an emergency with the buffer. Also, when the inspection platform is attached to the car, there is a problem that the configuration of the car becomes complicated. Also, it is known to install a rail separately from the guide rail of the car and install the inspection platform so that it moves up and down along this rail. However, in this case, a rail and a power device for raising and lowering the inspection platform need to be provided separately, and the configuration of the inspection platform may become complicated.

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2006-160480 [Patent Document 2] Japanese Patent Application Publication No. 8-208144 [Overview of the project] [Problems that the invention aims to solve]

[0007] The embodiment aims to provide an elevator car undercarriage inspection platform with a simple configuration that allows for space to be secured for stopping the elevator car with a buffer device during normal operation, and also allows for easy access to the underside of the elevator car during inspections. [Means for solving the problem]

[0008] The elevator car under-car inspection platform according to this embodiment is a platform for inspecting the underside of an elevator car that moves up and down along a guide rail that extends vertically within the elevator shaft. The elevator car under-car inspection platform includes a plurality of engaging bodies attached to the wall surface of the shaft, which are positioned between the bottom surface of the shaft and the elevator car at its lowest position and are arranged in a row along the vertical direction; a first base that can move up and down along the guide rail; a first scaffolding board supported on the first base; a first fixing device supported on the first base that can engage with the engaging bodies; a second fixing device positioned higher than the first fixing device and also able to engage with the engaging bodies; and an extension device. The extension device is an extension device that can extend and retract in the vertical direction and allows adjustment of the vertical distance between the first fixing device and the second fixing device. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic diagram showing an elevator system according to this embodiment. [Figure 2] Figure 2 is a perspective view showing the elevator car inspection platform according to this embodiment. [Figure 3] Figure 3 is a perspective view showing the engagement state of the first fixing device shown in Figure 2. [Figure 4] Figure 4 is a perspective view showing the released state of the first fixing device shown in Figure 2. [Figure 5] Figure 5 is a perspective view showing the contracted state of the expandable device shown in Figure 2. [Figure 6] Figure 6 is a perspective view showing the extended state of the expandable device shown in Figure 2. [Figure 7] Figure 7 is a schematic diagram illustrating the method of ascending and descending the inspection platform shown in Figure 2. [Figure 8] Figure 8, following Figure 7, is a schematic diagram illustrating the method of ascending and descending the inspection platform below the cage. [Figure 9] Figure 9, following Figure 8, is a schematic diagram illustrating the method of ascending and descending the inspection scaffolding below the cage. [Figure 10] Figure 10 is a schematic diagram showing a first modified example of the cage-under inspection scaffolding shown in Figure 2. [Figure 11] Figure 11 is a schematic diagram showing a second modified example of the cage-under inspection scaffolding shown in Figure 2. [Figure 12] Figure 12 is a diagram showing a third modified example of the undercarriage inspection scaffolding shown in Figure 2, and is a perspective view showing the engagement release prevention part in the first position. [Figure 13] Figure 13 is a perspective view showing the engagement release prevention part shown in Figure 12 in the second position. [Figure 14] Figure 14 is a perspective view showing a fourth modified example of the cage-under inspection scaffolding shown in Figure 2. [Figure 15] Figure 15 is a perspective view showing a fifth modified example of the cage-under inspection scaffolding shown in Figure 2. [Figure 16] Figure 16 is a perspective view showing a sixth modified example of the cage-under inspection scaffolding shown in Figure 2. [Modes for carrying out the invention]

[0010] Hereinafter, with reference to the drawings, the car lower inspection platform of the elevator according to the present embodiment will be described. First, the elevator apparatus according to the present embodiment will be described.

[0011] As shown in FIG. 1, the elevator apparatus 1 includes a car 3 and a counterweight 4 disposed in a hoistway 2. The car 3 and the counterweight 4 are connected via a main rope 5. The main rope 5 is wound around a traction sheave 6a provided on a hoisting machine 6 and a deflecting sheave 7. When the hoisting machine 6 winds up the main rope 5, the car 3 and the counterweight 4 move up and down. The car 3 moves up and down while being guided by car guide rails 8 extending in the vertical direction. The counterweight 4 moves up and down while being guided by weight guide rails 9 extending in the vertical direction. The hoisting machine 6 is installed in a machine room 10 provided above the hoistway 2. A control panel 11 is installed in the machine room 10. The control panel 11 is a device that controls the entire elevator apparatus 1 including the hoisting machine 6. For example, the control panel 11 controls the operation of the hoisting machine 6 in response to a landing call and a car call, and lands the car 3 at the landing 12 on the floor where the call is registered.

[0012] A buffer device 13 is installed on the bottom surface 2a of the hoistway 2. The buffer device 13 is configured to prevent the car 3 from colliding with the bottom surface 2a of the hoistway when the car 3 unexpectedly descends from the lowest position. The buffer device 13 is disposed between a pair of car guide rails 8. FIG. 1 shows a state where the car 3 has landed at the landing 12 on the lowest floor, and this position is the lowest position of the car 3.

[0013] Note that the elevator apparatus 1 is not limited to the form shown in FIG. 1. For example, a so-called machine-room-less elevator apparatus may be used. That is, the hoisting machine 6 and the control panel 11 may be provided above the hoistway 2 or the like without providing the machine room 10.

[0014] Next, the car lower inspection platform (hereinafter simply referred to as the car lower inspection platform 20) of the elevator according to the present embodiment will be described. The car lower inspection platform 20 is used when inspecting the lower surface of the car 3 that moves up and down along the car guide rail 8 extending in the vertical direction within the hoistway 2 of the elevator. Hereinafter, the car guide rail 8 will be simply referred to as the guide rail 8 for explanation.

[0015] As shown in FIG. 2, the car lower inspection platform 20 according to the present embodiment includes a plurality of engaging members 30, a pair of first bases 40A, a first platform plate 50A, a first fixing device 60A, a second fixing device 60B, and a telescopic device 70.

[0016] The engaging member 30 is attached to the wall surface of the hoistway 2. The guide rail 8 is attached to the wall surface of the hoistway 2 via a plurality of brackets 14. The brackets 14 are arranged at intervals in the vertical direction. A contact plate 15 is attached to the bracket 14. The guide rail 8 is attached to the contact plate 15 via a rail clip 16, and the guide rail 8 is attached to the contact plate 15 by the rail clip 16.

[0017] The engaging member 30 may be attached to a support member 21 extending in the vertical direction in the vicinity of the guide rail 8. The support member 21 is arranged on one side of the guide rail when viewed in the lateral direction. The lateral direction corresponds to the direction from one guide rail 8 to the other guide rail 8. The support member 21 may be attached to the above-described contact plate 15 or may be attached to the bracket 14.

[0018] In this embodiment, the engaging body 30 is positioned near one of the pair of guide rails 8, but not near the other guide rail 8. That is, in the lateral direction, the engaging body 30 is positioned on one side of the first scaffolding board 50A, and not on the other side. However, the engaging body 30 may be positioned on both sides of the first scaffolding board 50A in the lateral direction, along with the first fixing device 60A, the second fixing device 60B, and the telescopic device 70.

[0019] The engaging body 30 is positioned between the bottom surface 2a of the elevator shaft 2 and the elevator car 3 at its lowest position. In this embodiment, the undercarriage inspection platform 20 is intended to inspect the underside of the elevator car 3 when the elevator car 3 is at its lowest position; therefore, the engaging body 30 does not need to be positioned above the underside of the elevator car 3 at its lowest position. The engaging body 30 is arranged in a row along the vertical direction, and the engaging body 30 is arranged in a single row. The engaging body 30 may also be arranged at equal intervals in the vertical direction. In Figure 2, four engaging body 30 are shown, but there are also engaging body 30 on the back of the first scaffolding board 50A.

[0020] As shown in Figures 3 and 4, the engaging body 30 may include a fitting hole 31. The fitting hole 31 may be configured to allow the fitting rod 62 of the fixing devices 60A and 60B, which will be described later, to be fitted into it. The central axis of the fitting hole 31 may be aligned in the lateral direction. The fitting hole 31 may or may not penetrate the engaging body 30.

[0021] As shown in Figures 2 and 5, the first base 40A is configured to be able to move up and down along the guide rail 8. The first base 40A may include a pair of base bodies 41, a plurality of support beams (not shown), and a plurality of guide devices 42.

[0022] The base body 41 faces the corresponding guide rail 8. The base body 41 supports the guide device 42 and is capable of moving up and down along the guide rail 8.

[0023] The support beam is configured to support the first scaffolding board 50A, which will be described later. The support beam is supported by the base body 41. The support beam may be supported by at least one of the base bodies 41. The support beam may be formed so as not to overlap with the buffer device 13 when viewed from above.

[0024] The guide device 42 is supported by the base body 41. The guide device 42 may include a plurality of guide rollers 43. The guide device 42 may consist of three guide rollers 43, similar to the guide device installed in the elevator car 3. In this embodiment, the base body 41 supports two guide devices 42.

[0025] The first scaffolding board 50A is supported by the first base 40A. The first scaffolding board 50A may be placed on the support beam described above and attached to the support beam using bolts or the like (not shown).

[0026] The first scaffolding board 50A may be configured to be foldable. Figure 2 shows the first scaffolding board 50A in an unfolded state. In this case, the first scaffolding board 50A covers the shock absorber 13. When the first scaffolding board 50A shown in Figure 2 is folded, the planar area of ​​the first scaffolding board 50A is reduced to 1 / 3 and positioned on one or the other side in the front-to-back direction. In this case, the first scaffolding board 50A no longer exists in the center in the front-to-back direction. As a result, the shock absorber 13 is no longer covered by the first scaffolding board 50A, and the shock absorber 13 can be exposed from above. Alternatively, the first scaffolding board 50A is not limited to being foldable, as long as it has a shape that does not cover the shock absorber 13 when viewed from above.

[0027] As shown in Figure 5, the first fixing device 60A is supported by the first base 40A. The first fixing device 60A may also be supported by the base body 41 described above. The first fixing device 60A may be positioned opposite the row of engaging bodies 30 described above.

[0028] As shown in Figures 3 and 4, the first fixing device 60A is configured to be engageable with each of the engaging bodies 30. The first fixing device 60A may include a housing 61 and a fitting rod 62. The housing 61 may be attached to the base body 41. The fitting rod 62 is located inside the housing 61 and may be configured to slide laterally through a rod hole 63 formed in the housing 61. The fitting rod 62 may be configured to move forward and backward through the fitting hole 31 of the engaging body 30 and to be fitted into the fitting hole 31. The rod hole 63 extends laterally and may penetrate the housing 61.

[0029] The fitting rod 62 may include a gripping portion 64. The gripping portion 64 may extend perpendicular to the central axis of the fitting rod 62 and extend outward from the housing 61. The gripping portion 64 may be configured to be grasped by an operator when moving the fitting rod 62.

[0030] The housing 61 may have a rod guide portion 65 that guides the gripping portion 64. The rod guide portion 65 may include a release holding portion 65a that holds the fitting rod 62 in a released position retracted from the fitting hole 31 of the engaging body 30, a fitting holding portion 65b that holds the fitting rod 62 in a fitted position after it has entered the fitting hole 31 of the engaging body 30, and a sliding guide portion 65c that connects the release holding portion 65a and the fitting holding portion 65b. When the fitting rod 62 is in the released position, the engagement of the fixing devices 60A and 60B with the engaging body 30 is released. When the fitting rod 62 is in the fitted position, the fitting rod 62 is fitted into the fitting hole 31. The release holding portion 65a and the fitting holding portion 65b may be formed in a slit shape that extends in a direction perpendicular to the lateral direction (front-back direction) when viewed from above. The sliding guide portion 65c may be formed in a slit shape so as to extend laterally. The rod guide portion 65 may be formed so as to extend from the rod hole 63 to the outer circumferential surface of the housing 61.

[0031] As shown in Figures 2 and 5, the second fixing device 60B is positioned higher than the first fixing device 60A. In this embodiment, the second fixing device 60B is positioned above the first fixing device 60A. The second fixing device 60B may be attached to the second support portion 73 of the pantograph jack 71, which will be described later.

[0032] The second fixing device 60B is configured to be engageable with each of the engaging bodies 30. The second fixing device 60B has the same configuration as the first fixing device 60A described above.

[0033] As shown in Figures 5 and 6, the telescopic device 70 is supported on the first base 40A. The telescopic device 70 is supported on the base body 41 described above. In this embodiment, the telescopic device 70 is attached to one base body 41, and the other base body 41 is not. However, if the engaging body 30, the first fixing device 60A, and the second fixing device 60B are arranged on both sides of the first scaffolding board 50A in the lateral direction, the telescopic device 70 may be attached to both base bodies 41.

[0034] The telescopic device 70 is configured to be extendable and retractable in the vertical direction. The telescopic device 70 is configured to allow adjustment of the vertical distance between the first fixing device 60A and the second fixing device 60B. The telescopic device 70 according to this embodiment includes a pantograph jack 71.

[0035] The pantograph jack 71 includes a first support section 72, a second support section 73, a pair of link mechanisms 74, a screw rod 75, and a handle 76.

[0036] The first support portion 72 is attached to the first base 40A. The first support portion 72 may also be attached to the base body 41 described above.

[0037] The second support portion 73 is positioned above the first support portion 72. The second support portion 73 is positioned below the second fixing device 60B and supports the second fixing device 60B.

[0038] The link mechanism 74 includes a first arm 74a, a second arm 74b, and a link connecting portion 74c that pivotably connects one end of the first arm 74a and one end of the second arm 74b. The other end of the first arm 74a is pivotably connected to a first support portion 72. The other end of the second arm 74b is pivotably connected to a second support portion 73. The link connecting portion 74c has a threaded hole (not shown) into which a threaded rod 75 is screwed. The threaded hole may have a female thread formed with a trapezoidal screw. The threaded hole of one link connecting portion 74c may be formed with a left-hand thread, and the threaded hole of the other link connecting portion 74c may be formed with a right-hand thread.

[0039] The threaded rod 75 extends in the front-rear direction to connect the link connecting portion 74c of one link mechanism 74 with the link connecting portion 74c of the other link mechanism 74. A male thread is formed on the outer surface of the threaded rod 75, and it is configured to be screwed into the threaded hole of the link connecting portion 74c described above. The male thread of the threaded rod 75 may be a trapezoidal thread. The portion of the threaded rod 75 that screws into the link connecting portion 74c, which is formed with a left-hand thread, may be formed with a left-hand thread, and the portion of the threaded rod 75 that screws into the link connecting portion 74c, which is formed with a right-hand thread, may be formed with a right-hand thread.

[0040] The handle 76 may be formed at one end of the threaded rod 75. The handle 76 may also be formed integrally with the threaded rod 75.

[0041] The pantograph jack 71 configured in this way is set up so that the vertical distance between the first fixing device 60A and the second fixing device 60B can be adjusted. By rotating the screw rod 75 in one direction using the handle 76, the pantograph jack 71 can be retracted, shortening the vertical distance between the first fixing device 60A and the second fixing device 60B as shown in Figure 5. By rotating the screw rod 75 in the opposite direction, the vertical distance between the first fixing device 60A and the second fixing device 60B can be lengthened as shown in Figure 6.

[0042] Next, a method for inspecting the underside of the elevator car 3 using the elevator car inspection platform 20 according to this embodiment, which has the configuration described above, will be explained with reference to Figures 7 to 9.

[0043] First, as shown in Figure 7, during normal operation, the undercarriage inspection platform 20 is in its lowest position. The first scaffolding board 50A is extended, and the telescopic device 70 is retracted. The fitting rod 62 of the first fixing device 60A is fitted into the fitting hole 31 of the lowest engaging body 30. The fitting rod 62 of the second fixing device 60B is fitted into the fitting hole 31 of the second engaging body 30 from the bottom. The gripping portion 64 of each fitting rod 62 is positioned on the fitting holding portion 65b of the rod guide portion 65 described above.

[0044] Next, the fitting rod 62 of the second fixing device 60B is retracted from the fitting hole 31 of the corresponding engaging body 30. In this case, the gripping portion 64 of the fitting rod 62 is moved from the fitting holding portion 65b to the sliding guide portion 65c, thereby retracting the fitting rod 62 from the fitting hole 31. After the fitting rod 62 has retracted, the gripping portion 64 is moved to the release holding portion 65a.

[0045] Next, as shown in Figure 8, the pantograph jack 71 is extended. More specifically, the screw rod 75 is rotated using the handle 76 to raise the second support 73 and the second fixing device 60B. In this case, since the first fixing device 60A is engaged with the lowest engaging body 30, the second fixing device 60B can be raised by extending the pantograph jack 71. The second fixing device 60B is raised to a position facing the third engaging body 30 from the bottom.

[0046] Next, the fitting rod 62 of the second fixing device 60B is fitted into the fitting hole 31 of the engaging body 30, which is the third from the bottom. In this case, the gripping portion 64 of the fitting rod 62 is moved from the release holding portion 65a to the sliding guide portion 65c, allowing the fitting rod 62 to enter the fitting hole 31. After the fitting rod 62 has entered, the gripping portion 64 is moved to the fitting holding portion 65b. As a result, the second fixing device 60B engages with the engaging body 30, which is the third from the bottom.

[0047] Next, the fitting rod 62 of the first fixing device 60A is retracted from the fitting hole 31. In this case, the gripping portion 64 of the fitting rod 62 is moved from the fitting holding portion 65b to the sliding guide portion 65c, thereby retracting the fitting rod 62 from the fitting hole 31. After the fitting rod 62 has retracted, the gripping portion 64 is moved to the release holding portion 65a.

[0048] Next, as shown in Figure 9, the pantograph jack 71 is retracted. More specifically, the screw rod 75 is rotated using the handle 76 to raise the first support section 72 and the first fixing device 60A. In this case, since the second fixing device 60B is engaged with the third engaging body 30 from the bottom, retracting the pantograph jack 71 allows the first fixing device 60A to be raised together with the first scaffolding board 50A. The first fixing device 60A is raised to a position facing the second engaging body 30 from the bottom.

[0049] Next, the fitting rod 62 of the first fixing device 60A is fitted into the fitting hole 31 of the engaging body 30, which is located second from the bottom. In this case, the gripping portion 64 of the fitting rod 62 is moved from the release holding portion 65a to the sliding guide portion 65c, allowing the fitting rod 62 to enter the fitting hole 31. After the fitting rod 62 has entered, the gripping portion 64 is moved to the fitting holding portion 65b. As a result, the first fixing device 60A engages with the engaging body 30, which is located second from the bottom.

[0050] Subsequently, the process shown in Figures 7 to 9 is repeated until the first scaffolding board 50A reaches the target height. In this way, the first scaffolding board 50A can be positioned at a height that allows inspection work to be carried out on the underside of the elevator car 3 located at the lowest position.

[0051] After the first scaffolding board 50A reaches the target height, the worker can stand on the first scaffolding board 50A and perform inspection work on the underside of the elevator car 3. The worker may also use a stepladder or similar to stand on the first scaffolding board 50A.

[0052] After the inspection work is completed, the first scaffolding board 50A is lowered in the reverse order of the procedure described above. During normal operation of the elevator car 3, the first fixing device 60A is engaged with the lowest engaging body 30, and the second fixing device 60B is engaged with the second lowest engaging body 30. This allows the first scaffolding board 50A to be positioned at its lowest point. Then, by folding the first scaffolding board 50A, the buffer device 13 is exposed upwards. In this way, space can be secured for the buffer device 13 to stop the elevator car 3 after it has descended beyond its lowest position.

[0053] As described above, according to this embodiment, a first fixing device 60A, which can engage with an engaging body 30 attached to the wall surface of the elevator shaft 2, is supported on a first base 40A that can move up and down along the guide rail 8. A second fixing device 60B, positioned higher than the first fixing device 60A, can also engage with the engaging body 30. A telescopic device 70, which can extend and retract in the vertical direction, can adjust the vertical distance between the first fixing device 60A and the second fixing device 60B. As a result, by extending or retracting the telescopic device 70, the first scaffolding board 50A supported on the first base 40A can be raised or lowered, and the first scaffolding board 50A can be easily moved to a target height position. Therefore, with a simple configuration, space can be secured for stopping the elevator car 3 with the buffer device 13 during normal operation, and the underside of the elevator car 3 can be easily accessed during inspection.

[0054] Furthermore, according to this embodiment, the engaging body 30 includes a fitting hole 31. The first fixing device 60A and the second fixing device 60B each include a fitting rod 62 that is movable forward and backward into the corresponding fitting hole 31 and can be fitted into the corresponding fitting hole 31. This allows the first fixing device 60A and the second fixing device 60B to be easily engaged with the corresponding engaging body 30, and to be easily disengaged from the corresponding engaging body 30. This improves the operability of the undercarriage inspection platform 20.

[0055] Furthermore, according to this embodiment, the telescopic device 70 includes a pantograph jack 71. This allows for easy adjustment of the vertical distance between the first fixing device 60A and the second fixing device 60B by operating the pantograph jack 71. As a result, the configuration of the undercarriage inspection platform 20 can be simplified, and the operability of the undercarriage inspection platform 20 can be improved.

[0056] Furthermore, according to this embodiment, a handle 76 is formed at one end of the screw rod 75 of the pantograph jack 71. This allows the screw rod 75 to be easily rotated using the handle 76, and the vertical distance between the first fixing device 60A and the second fixing device 60B can be easily adjusted. As a result, the configuration of the under-cab inspection platform 20 can be simplified, and the operability of the under-cab inspection platform 20 can be improved.

[0057] (First variation) In the embodiment described above, an example was described in which the engaging members 30 are arranged in a single row. However, this disclosure is not limited to this. For example, as shown in Figure 10, the engaging members 30 may be arranged in two rows. In this case, the engaging members 30 are arranged in a row on both sides of the guide rail 8. The first fixing device 60A can engage with the engaging members 30 arranged in a row on one side of the guide rail 8, and the second fixing device 60B can engage with the engaging members 30 arranged in a row on the other side of the guide rail 8. In Figure 10, the first fixing device 60A is positioned on the left side of the guide rail 8 when viewed from the side and can engage with the engaging members 30 on the left side of the guide rail 8. The second fixing device 60B is positioned on the right side of the guide rail 8 when viewed from the side and can engage with the engaging members 30 on the right side of the guide rail 8. Although not shown in Figure 10, support members 21 (see Figure 2) may be positioned on both sides of the guide rail 8 to support the corresponding engaging members 30. In the example shown in Figure 10, the base body 41 may be configured to support the first fixing device 60A located on the left side of the guide rail 8 and the pantograph jack 71 located on the right side of the guide rail 8.

[0058] As shown in the modified example in Figure 10, the engaging body 30 that engages with the first fixing device 60A and the engaging body 30 that engages with the second fixing device 60B can be configured separately. This makes it possible to relax the positional accuracy requirements for the first fixing device 60A and the second fixing device 60B, thereby improving the workability of installing the under-cab inspection scaffolding 20.

[0059] (Second variation) Furthermore, in the above-described embodiment, an example was described in which the under-cab inspection scaffolding 20 includes one scaffolding board as the first scaffolding board 50A. However, the disclosure is not limited to this. For example, as shown in Figure 11, the under-cab inspection scaffolding 20 may include two scaffolding boards. More specifically, the under-cab inspection scaffolding 20 may further include a second base 40B and a second scaffolding board 50B. The second base 40B is positioned above the first base 40A, and the second scaffolding board 50B is positioned above the first scaffolding board 50A. The second scaffolding board 50B is supported by the second base 40B.

[0060] More specifically, the second base 40B and the second scaffolding board 50B are positioned higher than the second support portion 73 of the pantograph jack 71. The second fixing device 60B is attached to the second base 40B. The second base 40B may be configured similarly to the first base 40A. In the example shown in Figure 11, one guide device 42 is supported on both the base body 41 of the first base 40A and the base body 41 of the second base 40B. The second scaffolding board 50B may be configured similarly to the first scaffolding board 50A, or it may be foldable.

[0061] The second fixing device 60B may be attached to the second base 40B. The second support portion 73 of the pantograph jack 71 may be connected to the second base 40B via an extension member 80 that extends in the vertical direction. In this case, although not shown, the base body 41 of the second base 40B may be formed to extend to the extension member 80.

[0062] The first support portion 72 of the pantograph jack 71 may be attached to the base body 41 of the first base 40A. In this case, although not shown, the base body 41 of the first base 40A may be formed to extend to the first support portion 72.

[0063] As shown in the modified example in Figure 11, the second scaffolding board 50B can be placed above the first scaffolding board 50A. This increases the inspection workspace. For example, the second scaffolding board 50B may be used for inspecting the underside of the elevator car 3, while the first scaffolding board 50A is used for other inspection work. For example, although not shown, if a compensating sheave for winding a compensating rope is installed at the bottom of the elevator shaft 2, the first scaffolding board 50A may be used for inspecting the compensating sheave.

[0064] (Third variation) Furthermore, the cage-under inspection platform 20 according to the above-described embodiment may further include an engagement release prevention unit 90, as shown in Figures 12 and 13. The engagement release prevention unit 90 may be configured to prevent the first fixing device 60A or the second fixing device 60B from disengaging from the corresponding engaging body 30.

[0065] As shown in Figures 12 and 13, the disengagement prevention part 90 is formed to cover the rod hole 63 of the first fixing device 60A or the rod hole 63 of the second fixing device 60B from the inside of the elevator shaft 2. The disengagement prevention part 90 may be movable in the vertical direction between a first position (see Figure 12) that prevents disengagement of the first fixing device 60A and a second position (see Figure 13) that prevents disengagement of the second fixing device 60B.

[0066] As shown in Figure 12, when the engagement release prevention part 90 is in the first position, the rod hole 63 of the first fixing device 60A is covered by the engagement release prevention part 90. This prevents the fitting rod 62 of the first fixing device 60A from protruding inward from the rod hole 63. Therefore, the fitting rod 62 of the first fixing device 60A remains fitted into the fitting hole 31 of the corresponding engaging body 30, preventing the engagement of the first fixing device 60A from being released. When the engagement release prevention part 90 is in the first position, it is not necessary for it to cover the rod hole 63 of the second fixing device 60B, and the fitting rod 62 of the second fixing device 60B may be able to retract from the fitting hole 31 of the corresponding engaging body 30. Also, when the engagement release prevention part 90 is in the first position, it may be supported from below by a receiving part 91 provided on the first fixing device 60A.

[0067] As shown in Figure 13, when the engagement release prevention part 90 is in the second position, the rod hole 63 of the second fixing device 60B is covered by the engagement release prevention part 90. This prevents the fitting rod 62 of the second fixing device 60B from protruding inward from the rod hole 63. Therefore, the fitting rod 62 of the second fixing device 60B remains fitted into the fitting hole 31 of the corresponding engaging body 30, preventing the second fixing device 60B from being released. When the engagement release prevention part 90 is in the second position, it is not necessary for it to cover the rod hole 63 of the first fixing device 60A, and the fitting rod 62 of the first fixing device 60A may be able to retract from the fitting hole 31 of the corresponding engaging body 30. Furthermore, when the engagement release prevention part 90 is in the second position, the fitting rod 62 of the first fixing device 60A may be retracted from the fitting hole 31 of the corresponding engaging body 30, causing it to protrude inward from the rod hole 63 of the first fixing device 60A. In this case, the fitting rod 62 may be used as a receiving part that supports the engagement release prevention part 90 from below.

[0068] As shown in Figures 12 and 13, the engagement release prevention part 90 may include a plate-shaped portion 92 that extends vertically and is formed in a plate shape, and a gripping portion 93 that protrudes from the plate-shaped portion 92 into the inside of the elevator shaft 2. The plate-shaped portion 92 may be configured to cover the rod hole 63 of the first fixing device 60A and the rod hole 63 of the second fixing device 60B. The gripping portion 93 may be configured to be grasped by an operator when moving the engagement release prevention part 90 vertically.

[0069] As shown in the modified examples in Figures 12 and 13, the engagement release prevention unit 90 prevents the first fixing device 60A or the second fixing device 60B from disengaging from the corresponding engaging body 30. This prevents the disengagement of either the first fixing device 60A or the second fixing device 60B, and maintains the engaged state of either the first fixing device 60A or the second fixing device 60B. Therefore, the first scaffolding board 50A can be supported by either of the engaging bodies 30, preventing the first scaffolding board 50A from falling.

[0070] Furthermore, according to the modified configuration shown in Figures 12 and 13, the engagement release prevention unit 90 is vertically movable between a first position that prevents the engagement release of the first fixing device 60A and a second position that prevents the engagement release of the second fixing device 60B. This makes it possible to selectively prevent the engagement release of either the first fixing device 60A or the second fixing device 60B.

[0071] (Fourth variation) Furthermore, the cage-under inspection platform 20 according to the above-described embodiment may further include a proximity sensor 100, as shown in Figure 14. The proximity sensor 100 is configured to detect the engagement state of the first fixing device 60A with the engagement body 30 located at the lowest position. More specifically, the proximity sensor 100 is attached to the engagement body 30 located at the lowest position and detects whether or not the fitting rod 62 of the first fixing device 60A is present in the fitting hole 31 of the engagement body 30. If the presence of the fitting rod 62 is detected, it can be considered that the first fixing device 60A is engaged with the engagement body 30.

[0072] As shown in the modified example in Figure 14, the engagement state of the first fixing device 60A with the engaging body 30 located at the lowest position is detected by the proximity sensor 100. This allows for the electrical detection that the first scaffolding board 50A is positioned at its lowest point. Therefore, the detection signal transmitted by the proximity sensor 100 when it detects the engagement state of the first fixing device 60A can be used as a condition for normal operation of the elevator car 3. In this case, normal operation can be performed while ensuring space for stopping the elevator car 3 with the buffer device 13.

[0073] As shown in Figure 14, a proximity sensor 100 may also be attached to the second engaging body 30 from the bottom. In this case, the sensor detects whether or not the fitting rod 62 of the second fixing device 60B is present in the fitting hole 31 of the engaging body 30. If the presence of the fitting rod 62 is detected, the second fixing device 60B can be considered to be engaged with the engaging body 30. The detection signal transmitted from this proximity sensor 100 can also be used as a condition for normal operation of the elevator car 3. This allows for normal operation while ensuring space for stopping the elevator car 3 with the buffer device 13.

[0074] (Fifth variation) Furthermore, in the embodiment described above, an example was described in which the pantograph jack 71 includes a handle 76 formed at one end of the screw rod 75. However, the disclosure is not limited to this. For example, as shown in Figure 15, the pantograph jack 71 may include a hexagonal head 110 formed at one end of the screw rod 75. In this case, the screw rod 75 can be easily rotated by a power tool 112 by using a socket 111 that includes a hexagonal hole that can be fitted into the hexagonal head 110. As a result, the pantograph jack 71 can be easily operated, and the vertical distance between the first fixing device 60A and the second fixing device 60B can be easily adjusted. As a result, the operability of the under-cab inspection platform 20 can be improved.

[0075] (Sixth variation) Furthermore, in the above-described embodiment, an example was given in which the telescopic device 70 includes a pantograph jack 71. However, the disclosure is not limited to this. For example, as shown in Figure 16, the telescopic device 70 may include a hydraulic jack 120. The hydraulic jack 120 may be configured to adjust the vertical distance between the first fixing device 60A and the second fixing device 60B. Because the driving force of the hydraulic jack 120 is large, the vertical distance between the first fixing device 60A and the second fixing device 60B can be easily adjusted. In addition, the hydraulic jack 120 can raise or lower the first fixing device 60A or the second fixing device 60B in a linear manner in the vertical direction. This makes it easier to align the fixing devices 60A, 60B and the engaging body 30 when fitting the fitting rods 62 of the fixing devices 60A, 60B into the fitting holes 31 of the engaging body 30. The second fixing device 60B may be attached to the upper end of the hydraulic jack 120.

[0076] According to the embodiment described above, a simple configuration allows for securing space to stop the elevator car 3 with the buffer device 13 during normal operation, and also allows for easy access to the underside of the elevator car 3 during inspection.

[0077] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of symbols]

[0078] 2: Hoistway, 2a: Bottom surface, 3: Elevator car, 8: Guide rail, 20: Under-cab inspection platform, 30: Engaging body, 31: Fitting hole, 40A: First base, 40B: Second base, 50A: First scaffolding board, 50B: Second scaffolding board, 60A: First fixing device, 60B: Second fixing device, 62: Fitting rod, 70: Telescopic device, 71: Pantograph jack, 75: Screw rod, 76: Handle, 90: Engagement release prevention part, 100: Proximity sensor, 110: Hexagonal head, 112: Power tool, 120: Hydraulic jack

Claims

1. An undercarriage inspection platform for inspecting the underside of an elevator car that moves up and down along guide rails extending vertically within the elevator shaft, A plurality of engaging bodies attached to the wall surface of the elevator shaft, which are positioned between the bottom surface of the elevator shaft and the elevator car located at the lowest position, and which are arranged in a row along the vertical direction, A first base that can move up and down along the guide rail, The first scaffolding board is supported on the first base, A first fixing device supported on the first base and capable of engaging with the engaging body, A second fixing device, positioned higher than the first fixing device and capable of engaging with the engaging body, The aforementioned telescopic device that is extendable and retractable in the vertical direction, comprising a telescopic device that can adjust the vertical distance between the first fixing device and the second fixing device, An inspection platform for the area beneath the elevator car, equipped with [specific features / equipment].

2. The engaging body includes a fitting hole, The first and second fixing devices each include a fitting rod that is movable forward and backward into the corresponding fitting hole and can be fitted into the corresponding fitting hole. An elevator car inspection platform as described in claim 1.

3. The aforementioned telescopic device includes a pantograph jack. An elevator car undercarriage inspection platform according to claim 1 or 2.

4. The pantograph jack includes a screw rod and a handle formed at one end of the screw rod. An elevator car inspection platform as described in claim 3.

5. The engaging bodies are arranged in a row on both sides of the guide rail. The first fixing device is capable of engaging with the engaging bodies arranged in a row on one side of the guide rail, The second fixing device is capable of engaging with the engaging bodies arranged in a row on the other side of the guide rail. An elevator car undercarriage inspection platform according to claim 1 or 2.

6. A second base positioned above the first base, which is movable up and down along the guide rail, A second scaffolding board, supported by the second base and positioned above the first scaffolding board, Furthermore, The second fixing device is attached to the second base. An elevator car undercarriage inspection platform according to claim 1 or 2.

7. The first fixing device or the second fixing device is further provided with an engagement release prevention unit that prevents disengagement of the corresponding engaging body, An elevator car undercarriage inspection platform according to claim 1 or 2.

8. The engagement release prevention unit is movable in the vertical direction between a first position that prevents the first fixing device from disengaging and a second position that prevents the second fixing device from disengaging. An elevator car inspection platform as described in claim 7.

9. The device further includes a proximity sensor for detecting the engagement state of the first fixing device with the lowest-located engaging body, An elevator car undercarriage inspection platform according to claim 1 or 2.

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