Basement ladder device

Abstract

The invention provides a pit ladder device (7) characterized by: a counterweight frame (40) provided with a counterweight (4); a plurality of counterweight pieces (41) arranged in layers in the counterweight frame (40); a front face portion (40d) provided in the counterweight frame (40), at least a portion of the lengthwise side of the counterweight pieces (41) being arranged open in the front face portion (40d); a plurality of crosspiece portions (70) provided in the counterweight frame (40), arranged in layers in the up-down direction with the plurality of counterweight pieces (41) sandwiched therebetween; a footrest portion (71) provided on the front face portion (40d) side of the crosspiece portion (70) for the feet of a worker using the pit ladder device (7); and a handle portion (72) provided in the counterweight (4) for the hands of the worker, the footrest portion (71) being arranged so as not to overlap the counterweight pieces (41) on the front face portion (40d) side, as viewed in the vertical direction.

Description

Technical Field

[0001] This invention relates to an elevator pit ladder device for allowing maintenance and repair personnel to move between elevator landings and the pit floor. Background Technology

[0002] Conventional elevator pit ladder devices are either ladders installed in the pit or ladder benches brought from the landing into the shaft (see, for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-218172 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] If a ladder is installed inside the shaft, a dedicated space is needed to store the ladder. However, due to the narrowness of the pit inside the shaft, it is difficult to ensure such a dedicated space.

[0008] The present invention was made to solve the aforementioned problems, and its object is to provide a pit ladder device that allows the ladder to be installed in the shaft and does not require a dedicated space for storing the ladder in the pit.

[0009] Methods for solving problems

[0010] The present invention relates to a pit ladder device for an elevator, which is installed in a car and a counterweight that move in opposite directions within a shaft, for entering and exiting the pit from a landing. The pit ladder device comprises: a counterweight frame on which a counterweight is provided; a plurality of counterweight plates arranged overlappingly in the counterweight frame; a front portion disposed in the counterweight frame, wherein at least a portion of the side surface of the counterweight plates in the longitudinal direction is openly disposed in the front portion; a plurality of crossbars disposed in the counterweight frame, which are held in the vertical direction by the plurality of counterweight plates and arranged overlappingly with the counterweight plates; footrests disposed in the front side of the crossbars for use by personnel operating the pit ladder device; and handles disposed in the counterweight for use by personnel, wherein, viewed vertically, the footrests are configured not to overlap with the counterweight plates in the front side.

[0011] Invention Effects

[0012] This invention enables the installation of a ladder within a shaft, and provides a pit ladder device that eliminates the need for a dedicated space within the pit for storing the ladder. Attached Figure Description

[0013] Figure 1This is a perspective view showing the pit ladder device (whole) of the elevator according to Embodiment 1 of the present invention.

[0014] Figure 2 This is a front view showing the pit ladder device (overall) of the elevator according to Embodiment 1 of the present invention.

[0015] Figure 3 This is a top view showing the pit ladder device (overall) of the elevator according to Embodiment 1 of the present invention.

[0016] Figure 4 This refers to Embodiment 1 of the present invention. Figure 1 A three-dimensional view of the main components of the elevator pit ladder assembly.

[0017] Figure 5 This refers to Embodiment 1 of the present invention. Figure 2 Enlarged view (front view) of the main part (in use) of the elevator pit ladder assembly.

[0018] Figure 6 This refers to Embodiment 1 of the present invention. Figure 5 Enlarged view (3D view) of the main parts of the elevator pit ladder device.

[0019] Label Explanation

[0020] 1: Hoistway; 2: Traction machine; 3: Car; 4: Counterweight; 5a, 5b: Car guide rails; 6a, 6b: Counterweight guide rails; 7: Pit ladder assembly; 70: Crossbars; 71: Foot pedals; 72: Handrails; 8, 9: Landings. Detailed Implementation

[0021] Implementation method 1.

[0022] Figures 1-6 This is a diagram illustrating the pit ladder device according to Embodiment 1 of the present invention. Figure 1 It is a three-dimensional diagram representing the whole. Figure 2 This is the main view representing the whole structure. Figure 3 It is a top view showing the whole picture. Figure 4 It means Figure 1 A three-dimensional view of the main parts. Figure 5 It means Figure 2 Enlarged view (front view) of the main part (when in use). Figure 6 It means Figure 5 Enlarged view (3D view) of the main parts.

[0023] As shown in the figure, a traction machine 2 with a sheave and a control device (not shown) for controlling the operation of the elevator are installed inside the hoistway 1. Additionally, a common main cable (not shown) is wound around the traction machine 2. The main cable can be, for example, a wire rope, a rope, or a belt.

[0024] Inside the hoistway 1, the car 3 and counterweight 4 are suspended by the main cable. The car 3 is propelled along the hoistway 2 by the driving force of the traction machine. Figure 2 The pair of cars shown are raised and lowered within the hoistway 1 via guide rails 5a and 5b.

[0025] In addition, counterweight 4, driven by the traction machine 2, moves along... Figure 2 The pairs of reusable guide rails 6a and 6b shown move up and down in the direction opposite to that of the car 3 within the hoistway 1. The movement of the traction machine 2 is controlled by a control device.

[0026] In this invention, an elevator pit ladder device 7 is provided on the counterweight 4. In the following description, the elevator pit ladder device 7 will be simply referred to as ladder device 7. The ladder device 7 is used by workers when entering and exiting the pit 1a in the hoistway 1 from the lowest landing 8.

[0027] The counterweight 4 has a counterweight frame 40 and multiple counterweight plates 41 supported on the counterweight frame 40 and adjusted according to the weight of the car 3.

[0028] By installing the ladder device 7 on the counterweight 4, the weight of the ladder device 7 is added as a counterweight. Therefore, the number of counterweight plates 41 is set to take into account the weight of the ladder device 7.

[0029] The counterweight frame 40 has an upper frame 40a and a lower frame 40b arranged at a distance from each other in the height direction of the shaft 1, and a pair of longitudinal frames 40c connecting the ends of the upper frame 40a and the lower frame 40b. After being fixed as a whole, a plurality of counterweight pieces 41 are fixed to one of the lower frame 40b and the pair of longitudinal frames 40c.

[0030] When viewed from the vertical direction, the counterweight frame 40 is disposed on the side of the car 3 at the landing 8 side and has a front part 40d. The side parts of a plurality of counterweight pieces 41 in the longitudinal direction are open to the car 3 side in the front part 40d except for the parts that overlap with the longitudinal frame 40.

[0031] The ladder assembly 7 includes rungs 70, footrests 71, and handles 72. Multiple rungs 70 are arranged together with multiple counterweights 41 in a counterweight frame 40. Furthermore, the rungs 70 are arranged in a ratio of 1 to 4 to 5 counterweights 41.

[0032] The crossbar 70 is formed of a steel plate with a thickness of about 1 cm, and except for the foot pedal 71, its shape is roughly the same as that of the counterweight plate 41. The foot pedal 71 has the strength to withstand the weight of the worker (up to about 200 kg) because it is stepped on by the worker using the ladder device 7.

[0033] In addition, when viewed from the vertical direction, the foot pedal 71 is configured not to overlap with the counterweight plate 41, and is configured to protrude about 10 cm outward from the front part 40d side of the counterweight frame 40.

[0034] The handle portion 72 is formed in the middle of the foot pedal portion 71 along its length, and is formed on the front 40d side when viewed from the vertical direction. The handle portion 72 is an elongated hole that runs through the foot pedal portion 71 along the vertical direction, and is shaped into a rectangle approximately 3cm long and 15cm wide, which is large enough for the operator's hand to grip.

[0035] Four handle portions 40e are formed on the front part 40d side of the upper frame 40a. Two handle portions 40f are formed on the upper part and front part 40d side of the longitudinal frame 40c along its length. The handle portions 40e and 40f are rectangular, similar to the handle portion 72. In addition, the handle portions 40e and 40f are formed at the position where the counterweight piece 41 is not disposed on the counterweight frame 40.

[0036] Next, the procedure for workers to enter and exit the pit 1a in the shaft 1 from the lowest level station 8 along the aforementioned pit ladder device 7 will be explained.

[0037] First, the operator moves the car 3 to the uppermost landing 9. This moves the counterweight 4 to near the floor level of the lowermost landing 8. At this point, the counterweight 4 stops at a position where it does not come into contact with the counterweight buffer 10 located in the pit 1a.

[0038] From the perspective of the landing station 8, the counterweight 4 is positioned at its upper part, closest to the landing station 8. Next, the worker moves from the landing station 8, holding the handle 72 or handle 40e, 40f of the pit ladder device 7 with their hands and stepping on the footrest 71, towards the shaft 1.

[0039] The worker descends along the pit ladder assembly 7 using multiple handles 72 and foot pedals 71, moving towards the pit 1a. After moving to the foot pedal 71 located closest to the pit 1a, the worker descends from the pit ladder assembly 7 to reach the pit 1a.

[0040] When the workers move from pit 1a to station 8, the process is the reverse of the process of moving from station 8 to pit 1a, so the explanation is omitted.

[0041] As described above, according to Embodiment 1, a pit ladder device 7 is provided in the counterweight 4 of the car 3 and counterweight 4 that move in opposite directions within the hoistway 1, for entering and exiting the pit 1a from the landing 8. The pit ladder device 7 includes: a counterweight frame 40 on which the counterweight 4 is disposed; a plurality of counterweight plates 41 disposed overlappingly in the counterweight frame 40; a front section 40d disposed in the counterweight frame 40, with at least a portion of the side surface of the counterweight plates 41 in the longitudinal direction openly disposed in the front section 40d; and a plurality of crossbars 70 disposed in the counterweight frame 40. The ladder device 7 is configured to be clamped by the counterweight 41 in the vertical direction and overlapped with the counterweight 41; a foot pedal 71 is provided on the front part 40d side of the crossbar 70 for the operator to step on; and a handle 72 is provided on the counterweight 4 for the operator to hold. When viewed from the vertical direction, the foot pedal 71 is configured not to overlap with the counterweight 41 on the front part 40d side. Thus, the ladder device 7 can be installed in the shaft 1 and a dedicated space for storing the ladder device 7 is not required in the pit 1a.

[0042] Furthermore, the ladder assembly 7 is integrated with the counterweight 4. That is, the counterweight 4 is supported by counterweight guide rails 6a and 6b, so when the operator uses the ladder assembly 7, the ladder assembly 7 will not shift in the left-right or depth direction, and can be used stably.

[0043] In addition, the foot pedal 71 is positioned on the outside of the counterweight frame 40 when viewed from the vertical direction, so it does not affect the counterweight plate 41. Therefore, the counterweight plate 41 can directly use the counterweight plate of the conventional shape, which can suppress the increase in cost of the ladder device 7.

[0044] Handles 40e and 40f are located on foot pedals 71, thus not affecting counterweight 41. Therefore, counterweight 41 can directly use counterweights with conventional shapes, which can suppress the increase in cost of ladder device 7.

[0045] Furthermore, the handles 40e and 40f are located on the counterweight frame 40, thus not affecting the counterweight plate 41. Therefore, the counterweight plate 41 can directly use a counterweight plate with a conventional shape, which can suppress the increase in cost of the ladder device 7.

[0046] Furthermore, in Embodiment 1, the foot pedal 71 is positioned on the outer side of the counterweight frame 40 when viewed from the vertical direction, but this configuration is not necessary. For example, the foot pedal 71 may be positioned on the inner side of the counterweight frame 40. In this case, it is necessary to ensure that the shapes of the counterweight pieces 41 do not partially overlap, but the same function and effect as in Embodiment 1 can still be achieved.

[0047] Industrial availability

[0048] This invention is an elevator pit ladder device for allowing maintenance and repair personnel to move between elevator floors and the pit floor.

Claims

1. A pit ladder device, comprising a counterweight in a car and a counterweight that move in opposite directions within a shaft, for entering and exiting the pit from a landing, characterized in that, The pit ladder device includes: A counterweight frame, which is configured with the aforementioned counterweight; Multiple counterweight pieces are arranged overlappingly in the counterweight frame; A front portion is disposed on the counterweight frame, and at least a portion of the side portion of the counterweight piece in the longitudinal direction is openly disposed on the front portion; Multiple crossbars are disposed on the counterweight frame and are arranged overlapping with the counterweight pieces in the vertical direction, being held between the multiple counterweight pieces. A footrest, located on the front side of the crossbar, is provided for workers using the pit ladder device to step on; and A handle is provided on the counterweight for the operator to hold. Viewed from the vertical direction, the foot pedal is configured not to overlap with the counterweight plate on the front side.

2. The pit ladder device according to claim 1, characterized in that, Viewed from the vertical direction, the footrest is located on the outside of the counterweight frame.

3. The pit ladder device according to claim 1, characterized in that, The handle is located on the foot pedal.

4. The pit ladder device according to claim 1, characterized in that, The handle is located on the counterweight frame.

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