Pile ladder device

Abstract

To provide a pit ladder device that eliminates the need for a dedicated storage space for ladders within the pit. [Solution] The pit ladder device comprises a counterweight frame 40 on which a counterweight is placed, a counterweight piece, a stepping ledge 70, a footrest 71 on which a worker's feet can be placed, and a handrail 72 provided on the counterweight on which a worker's hands can be placed. The footrest 71 is positioned so as not to overlap with the counterweight piece on the front ledge 40d side when viewed from the vertical direction.

Description

Technical Field

[0001] This invention relates to a pit ladder device for an elevator used by maintenance and inspection workers to move between the landing of the elevator and the pit floor surface.

Background Art

[0002] Conventional pit ladder devices for elevators use ladders installed in the pit or bring a step ladder or the like from the landing into the hoistway for use. (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] When installing a ladder in the hoistway, a dedicated space for storing this ladder is required. However, since the pit in the hoistway is narrow, it has been difficult to secure this dedicated space.

[0005] This invention has been made to solve the above problems, and its object is to provide a pit ladder device in which a ladder is provided in the hoistway and a dedicated space for storing the ladder in the pit is not required.

Means for Solving the Problems

[0006] The elevator pit ladder device in this invention is a pit ladder device that allows access to and from a pit from a landing provided on a counterweight, among an elevator car and a counterweight that move up and down in opposite directions within a hoistway, and comprises a counterweight frame on which the counterweight is provided, a plurality of counterweight pieces arranged on top of the counterweight frame, a front portion provided on the counterweight frame and provided with at least a part of the longitudinal side portion of the counterweight pieces being open, a plurality of step portions provided on the counterweight frame and arranged on top of the counterweight pieces, sandwiched vertically between the plurality of counterweight pieces, a footrest portion provided on the front portion side of the steprest portion on which a worker using the pit ladder device can place their feet, and a handrest portion provided on the counterweight on which a worker can place their hands, wherein the footrest portion is arranged so as not to overlap with the counterweight pieces on the front portion side when viewed from the vertical direction. [Effects of the Invention]

[0007] This invention makes it possible to realize a pit ladder device in which a ladder is installed within the elevator shaft and there is no need for a dedicated space to store the ladder in the pit. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the elevator pit ladder device (overall) according to Embodiment 1 of this invention. [Figure 2] This is a front view showing the elevator pit ladder device (overall) according to Embodiment 1 of the present invention. [Figure 3] This is a plan view showing the elevator pit ladder device (overall) according to Embodiment 1 of this invention. [Figure 4] This is a perspective view showing the main part of the elevator pit ladder device shown in Figure 1 according to Embodiment 1 of the present invention. [Figure 5] This is an enlarged view (front view) showing the main part (in use) of the elevator pit ladder device shown in Figure 2 according to Embodiment 1 of this invention. [Figure 6] This is an enlarged view (perspective view) showing the main part of the elevator pit ladder device shown in Figure 5 according to Embodiment 1 of this invention.

[0009] Embodiment 1. Figures 1 to 6 illustrate a pit ladder device according to Embodiment 1 of the present invention. Figure 1 is an overall perspective view, Figure 2 is an overall front view, Figure 3 is an overall plan view, and Figure 4 is a perspective view showing the main part of Figure 1. Figure 5 is an enlarged view (front view) of the main part of Figure 2 (when in use). Figure 6 is an enlarged view (perspective view) of the main part of Figure 5.

[0010] As shown in the figure, the hoistway 1 contains a hoisting machine 2 with a sheave and a control device (not shown) for controlling the operation of the elevator. A common main rope (not shown) is wound around the hoisting machine 2. Examples of the main rope include wire, rope, or belt.

[0011] Within the hoistway 1, the elevator car 3 and counterweight 4 are suspended by a main cable. The elevator car 3 is raised and lowered within the hoistway 1 along a pair of car guide rails 5a and 5b shown in Figure 2, driven by the hoisting machine 2.

[0012] Furthermore, the counterweight 4 is raised and lowered within the elevator shaft 1 in the opposite direction to the elevator car 3, along a pair of weight guide rails 6a and 6b shown in Figure 2, by the driving force of the hoisting machine 2. The operation of the hoisting machine 2 is controlled by a control device.

[0013] 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 the ladder device 7. The ladder device 7 is used when workers enter and exit the pit 1a in the elevator shaft 1 from the landing 8 on the lowest floor.

[0014] The counterweight 4 comprises a counterweight frame 40 and a plurality of counterweight pieces 41 supported by the counterweight frame 40 and adjusted according to the weight of the elevator car 3.

[0015] By attaching the ladder device 7 to the counterweight 4, the weight of the ladder device 7 is added as a counterweight. Therefore, the number of counterweight pieces 41 is set considering the weight of the ladder device 7.

[0016] The counterweight frame 40 has an upper frame 40a and a lower frame 40b that are arranged at a distance from each other in the height direction of the hoistway 1, and a pair of vertical frames 40c that connect between the ends of the upper frame 40a and the lower frame 40b. After a plurality of counterweight pieces 41 are integrally fixed, they are fixed to one of the lower frame 40b and the pair of vertical frames 40c.

[0017] The counterweight frame 40 is arranged on the boarding side of the side surface of the car 3 as viewed from the vertical direction, and has a front surface portion 40d that is arranged to be open toward the car 3 except for the portion where the longitudinal side portions of the plurality of counterweight pieces 41 overlap with the vertical frame 40.

[0018] The ladder device 7 has a tread portion 7, a footrest portion 71, and a handrail portion 72. A plurality of tread portions 70 are arranged on the counterweight frame 40 together with a plurality of counterweight pieces 41. Also, the tread portion 70 is arranged at a ratio of 1 for 4 to 5 counterweight pieces 41.

[0019] The tread portion 70 is formed of a steel plate with a thickness of about 1 cm, and its shape is formed to be substantially the same as that of the counterweight piece 41 except for the footrest portion 71. The footrest portion 71 has a strength that can withstand the weight of an operator (up to about 200 kg) because the feet of the operator using the ladder device 7 can be placed on it.

[0020] Also, the footrest portion 71 is arranged so as not to overlap with the counterweight piece 41 as viewed from the vertical direction, and protrudes about 10 cm outward from the front surface portion 40d side of the counterweight frame 40 and is arranged.

[0021] The handhold portion 72 is formed at the intermediate portion in the longitudinal direction of the foothold portion 71 and on the front surface portion 40d side when viewed from the vertical direction. The handhold portion 72 is a long hole formed by penetrating the foothold portion 71 in the vertical direction, and is formed in a rectangular shape with a size large enough for an operator's hand to be placed thereon, approximately 3 cm in length and approximately 15 cm in width.

[0022] A total of four handhold portions 40e are formed on the front surface portion 40d side of the upper frame 40a. A total of two handhold portions 40f are formed at the upper portion in the longitudinal direction of the vertical frame 40c and on the front surface portion 40d side. The handhold portions 40e and 40f are formed in the same rectangular shape as the handhold portion 72. Further, the handhold portions 40e and 40f are formed at positions where the counterweight pieces 41 of the counterweight frame 40 are not arranged.

[0023] Next, the procedure when an operator enters and exits the pit 1a in the hoistway 1 from the lowest floor landing 8 of the above-described pit ladder device 7 will be described.

[0024] First, the operator moves the car 3 to the highest floor landing 9. As a result, the counterweight 4 moves to around the floor level of the lowest floor landing 8. At this time, the counterweight 4 stops at a position where it does not contact the weight buffer 10 provided in the pit 1a.

[0025] Here, when viewed from the landing 8, the position of the counterweight 4 is such that its upper part is arranged at the position closest to the landing 8. Next, while hanging the hand on the handhold portion 72 or the handhold portions 40e and 40f of the pit ladder device 7 from the landing 8, the operator hangs the foot on the foothold portion 71 and moves to the hoistway 1 side.

[0026] The operator descends the pit ladder device 7 while sequentially using the plurality of handhold portions 72 and foothold portions 71, and moves to the pit 1a side. After the operator moves to the foothold portion 71 arranged at the position closest to the pit 1a, the operator gets off the pit ladder device 7 and reaches the pit 1a.

[0027] When a worker moves from pit 1a to landing 8, the procedure is the reverse of when moving from landing 8 to pit 1a, so the explanation is omitted.

[0028] As described above, according to Embodiment 1, in a pit ladder device 7 that moves in and out of the pit 1a from a landing 8 provided on the counterweight 4, among the elevator car 3 and counterweight 4 that move up and down in opposite directions within the elevator shaft 1, the counterweight 4 is arranged on a counterweight frame 40, a plurality of counterweight pieces 41 are arranged on top of the counterweight frame 40, a front portion 40d is provided on the counterweight frame 40 and is arranged with at least a part of the longitudinal side portion of the counterweight piece 41 open, and the counterweight piece The ladder device 7 is provided with multiple stepping stones 70 that are sandwiched vertically between the 41 and stacked together with the counterweight piece 41, a footrest 71 provided on the front 40d side of the stepping stones 70 on which a worker using the pit ladder device 7 can place their feet, and a handrest 72 provided on the counterweight 4 on which a worker can place their hands. The footrest 71 is positioned so as not to overlap with the counterweight piece 41 on the front 40d side when viewed from the vertical direction, thereby realizing a ladder device 7 that is installed in the elevator shaft 1 and does not require a dedicated space for storing the ladder device 7 in the pit 1a.

[0029] Furthermore, the ladder device 7 is integrated with the counterweight 4. That is, since the counterweight 4 is supported by the weight guide rails 6a and 6b, when a worker uses the ladder device 7, it can be used stably without shifting in the left-right or depth directions.

[0030] Furthermore, since the footrest portion 71 is positioned outside the counterweight frame 40 when viewed from the vertical direction, it does not affect the counterweight piece 41. Therefore, the counterweight piece 41 can be reused in its conventional shape, thereby suppressing an increase in the cost of the ladder device 7.

[0031] Since the handholds 40e and 40f are provided on the footholds 71, they do not affect the counterweight piece 41. Therefore, the counterweight piece 41 can be reused in its conventional shape, which helps to suppress cost increases for the ladder device 7.

[0032] Furthermore, since the handholds 40e and 40f are provided on the counterweight frame 40, they do not affect the counterweight piece 41. Therefore, the counterweight piece 41 can be reused in its conventional shape, thereby suppressing cost increases for the ladder device 7.

[0033] In Embodiment 1, the footrest portion 71 is positioned outside the counterweight frame 40 when viewed from the vertical direction, but this arrangement is not necessarily required. For example, the footrest portion 71 may be positioned inside the counterweight frame 40. In this case, it is necessary to ensure that the shapes of the counterweight pieces 41 do not overlap locally, but it goes without saying that the same function and effect as in Embodiment 1 can be achieved. [Explanation of Symbols]

[0034] 1 Hoistway, 2 Hoisting machine, 3 Elevator car, 4 Counterweight, 5a, 5b Guide rails for the elevator car, 6a, 6b Guide rails for the counterweight, 7 Pit ladder device, 70 Stepping stones, 71 Footrests, 72 Handrails, 8, 9 Landings [Industrial applicability]

[0035] The present invention relates to an elevator pit ladder device used for maintenance and inspection workers to move between the elevator landing and the pit floor.

Claims

1. In a hoistway that moves up and down in opposite directions for both the elevator car and the counterweight, a pit ladder device is provided on the counterweight that allows access to and from the pit from the landing, A weight frame on which the counterweight is placed, a plurality of weight pieces placed on top of the weight frame, and a front portion provided on the weight frame, on which at least a portion of the longitudinal side portions of the weight pieces are open. The aforementioned weight frame is provided with a plurality of foot rails that are sandwiched vertically by the plurality of weight pieces and arranged to overlap with the weight pieces, A footrest is provided on the front side of the stepping board, on which the feet of a worker using the pit ladder device can be placed, The counterweight is provided with a handle portion on which the worker's hand can be placed, The pit ladder device is characterized in that the footrest portion is arranged so as not to overlap with the weight piece on the front side when viewed from the vertical direction.

2. The pit ladder device according to claim 1, characterized in that the footrest portion is positioned outside the weight frame when viewed from the vertical direction.

3. The pit ladder device according to claim 1, characterized in that the handhold portion is provided on the foothold portion.

4. The pit ladder device according to claim 1, characterized in that the handgrip portion is provided on the weight frame.

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