Pit ladder arrangement for an elevator

Abstract

The present application provides a pit ladder device (2) of an elevator, characterized by comprising: a telescopic ladder (20) which is folded and stored in a pit surface (1a) of the elevator when not in use and is stretched for use in the up-down direction when in use; a pair of mounting arms (21) which are provided at lower end portions of a car floor (3) and extend from the lower end portions toward the pit surface (1a); a pair of engaging portions (22) which are respectively provided on the pit surface (1a) side of the mounting arms (21); a fixing portion (201) which is provided on one side of the ladder (20) and fixes the one side of the ladder (20) to the pit surface (1a) in a rotatable manner; and a pair of engaged portions (23) which are provided on the other side of the ladder (20) and are capable of engaging with the engaging portions (22).

Description

Technical Field

[0001] This invention relates to a pit ladder device for elevators used by workers to enter and exit the pit from a floor. Background Technology

[0002] In conventional pit ladder systems, the ladder is guided by ladder rails, preventing it from swaying with the lower part of the car as a fulcrum. This allows the operator to easily use the ladder system (see, for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-18925 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Because space is needed to house the ladder rails and rail drive mechanism on the car floor, there are issues with the increased height of the car floor and the increased weight of the car.

[0008] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a pit ladder device that does not require ladder rails and rail drive devices and can be easily used without affecting the height of the car floor and the weight of the car.

[0009] Methods for solving problems

[0010] The elevator pit ladder device of the present invention is characterized by comprising: a retractable ladder that is folded and stored in the pit surface of the elevator when not in use and is stretched in the vertical direction when in use; a pair of mounting arms disposed at the lower end of the car floor and extending from the lower end toward the pit surface; a pair of engaging portions disposed on the pit surface side of the mounting arms; a fixing portion disposed on one side of the ladder and fixing one side of the ladder to the pit surface in a rotatable manner; and a pair of engaging portions disposed on the other side of the ladder and capable of engaging with the engaging portions.

[0011] Invention Effects

[0012] The present invention enables a pit ladder device that does not require ladder rails and rail drive devices, and can be easily used without affecting the height of the car floor or the weight of the car. Attached Figure Description

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

[0014] Figure 2This refers to a view from below in Embodiment 1 of the present invention. Figure 1 A 3D view of the elevator pit ladder assembly (as a whole) in use.

[0015] Figure 3 This is a perspective view showing the elevator pit ladder device (whole) of Embodiment 1 of the present invention when it is stored.

[0016] Figure 4 This refers to Embodiment 1 of the present invention. Figure 1 A side view of the main part of the elevator pit ladder assembly.

[0017] Figure 5 This refers to Embodiment 1 of the present invention. Figure 3 A side view of the main part of the elevator pit ladder assembly.

[0018] Figure 6 This is a side view showing the engagement preparation (c) of the pit ladder device of the elevator according to Embodiment 1 of the present invention before use.

[0019] Figure 7 This is an enlarged view (side view) showing the engagement preparation (a) of the pit ladder device of the elevator according to Embodiment 1 of the present invention before use.

[0020] Figure 8 This is an enlarged view (side view) showing the engagement preparation (b) of the pit ladder device of the elevator according to Embodiment 1 of the present invention before use.

[0021] Figure 9 This refers to Embodiment 1 of the present invention. Figure 6 Enlarged view (side view) of the locking preparation (c) of the elevator pit ladder device before use.

[0022] Figure 10 This is a side view showing the storage preparation (a) of the pit ladder device of the elevator according to Embodiment 1 of the present invention after use.

[0023] Figure 11 This is a side view showing the storage preparation (b) of the pit ladder device of the elevator according to Embodiment 1 of the present invention after use.

[0024] Label Explanation

[0025] 1: Hoistway; 1a: Pit surface; 2: Pit ladder device; 20: Ladder; 21: Mounting arm; 22: Engaging part; 23: Engaged part; 3: Car floor; 4: Skirt; 5: Landing station. Detailed Implementation

[0026] Implementation method 1.

[0027] Figures 1 to 11This is a diagram illustrating the pit ladder device according to Embodiment 1 of the present invention. Figure 1 It is a 3D diagram showing how it is used. Figure 2 It means looking up from below. Figure 1 A three-dimensional image of the time. Figure 3 It is a 3D diagram showing the storage process. Figure 4 yes Figure 1 Side view. Figure 5 yes Figure 3 Side view. Figure 6 This is a side view showing the card engagement preparation (c) before use. Figure 7 This is an enlarged view showing the card preparation (a) before use. Figure 8 This is an enlarged view showing the card preparation (b) before use. Figure 9 It means Figure 6 Enlarged view of the card preparation (c) before use. Figure 10 This is a side view showing the storage preparation after use (a). Figure 11 This is a side view showing the storage preparation after use (b).

[0028] exist Figures 1-5 In the shaft 1, a pit ladder device 2 is provided. The pit ladder device 2 has a retractable ladder 20, a mounting arm 21, a locking part 22, and a locked part 23. When not in use, the ladder 20 is folded and stored in the pit surface 1a, and when in use, it is stretched in the vertical direction.

[0029] Mounting arms 21 are fixedly attached to each other separately on the lower part of the car floor 3. Each mounting arm 21 has an arm portion 21a extending vertically from the lower part of the car floor 3 toward the pit surface 1a; and an engaging portion 22 located at the pit surface 1a side of the arm portion 21a, which engages with the engaging portion 23. The mounting arms 21 move as the car floor 3 moves.

[0030] In addition, the upper part of the mounting arm 21 is fixed to the lower end of the car floor 3, and the arm portion 21a of the mounting arm 21 is also fixed to the side of the skirt 4 provided on the car floor 3. The mounting arm 21 is fixed to both the lower end of the car floor 3 and the side of the skirt 4 on the car floor 3 side, and also serves as a reinforcing member of the skirt 4.

[0031] The length of the arm portion 21a is formed to be equal to or shorter than the length of the skirt plate 4 in the vertical direction.

[0032] The ladder 20 is formed to bend at the middle part 200 in the length direction, has a fixing part 201 at one end that is rotatably fixed to the pit surface 1a, and has a locking part 23 at the other end that can engage with the locking part 22.

[0033] The engagement portion 22 is arranged horizontally along its length. The engagement portion 22 has a hook portion 22a on one side and a rotating portion 22b on the other side. The rotating portion 22b causes the engagement portion 22 to rotate when the hook portion 22a abuts against the engaged portion 23 from above, and can maintain the horizontal direction of the engagement portion 22 when a load is applied to the hook portion 22a.

[0034] The engaging portion 23 is provided at the end of the side of the ladder 20 that is stretched, and is provided on both sides in the width direction. The engaging portion 23 has an arm portion 23a that extends outward along the width direction of the ladder 20.

[0035] Next, in Figures 6-9 In this section, the operation of Embodiment 1, configured as described above, will be explained. First, the operation of stretching the ladder 20, which is folded on the pit surface 1a, in order to use the pit ladder device 2, in the vertical direction will be explained.

[0036] First, the operator stops the car floor 3 at the lowest floor, 5. Next, the operator switches the elevator's operating mode from normal mode to maintenance mode. Then, the operator moves the car floor 3 further below the lowest floor. The operator operates the elevator to lower the car floor 3 from the pit surface 1a until the hook 22a of the engaging part 22 abuts against the arm 23a of the engaged part 23.

[0037] After the hook 22a abuts against the upper part of the arm 23a, the operator lowers the car floor 3 further so that the hook 22a is positioned below the arm 23a.

[0038] Next, when the operator raises the car floor 3 and the hook 22a abuts against the lower part of the arm 23a, the hook 22a engages with the arm 23a. In this state, when the operator raises the car floor 3, the engaging part 22 remains horizontal, so the engaged part 23 rises while engaged with the engaging part 22.

[0039] The ladder 20 is pulled up by the engaging part 22 via the engaging part 23, thereby being stretched in the vertical direction. The fixing part 201 of the ladder 20 is fixed to the pit surface 1a, so when the operator raises the car floor 3 to the designated position, the ladder 20 is in a fully stretched state in the vertical direction. When the ladder 20 is in a fully stretched state in the vertical direction, the operator stops the upward movement of the car floor 3.

[0040] At this time, a tension acts on the ladder 20 in the direction that stretches the engaged portion 23 upwards as the car floor 3 rises. The car floor 3 is stopped at a predetermined position, causing this tension to act on the ladder 20.

[0041] In addition, when the operator uses the ladder 20, the car floor 3 is raised to a specified position so that the following tension is applied to the ladder 20: the tension is the tension required to stabilize the ladder 20 and prevent the ladder 20 from slackening in the vertical direction or shifting in the lateral direction.

[0042] Furthermore, when the ladder 20 is not in use, the car floor 3 will not move to a position lower than the lowest floor, so the engaging part 22 and the engaged part 23 will not come into contact.

[0043] Next, in Figures 10-11 The process of folding and storing the ladder 20, which is stretched vertically, in the pit surface 1a is described. To alleviate the tension acting on the ladder 20, the car floor 3 is lowered slightly from the designated position. The operator removes the hook 22a from the arm 23a, releasing the engagement between the hook 22a and the arm 23a.

[0044] While holding the rope 202 attached to the engaged portion 23 of the disengaged ladder 20, the worker gradually lowers the ladder 20 towards the pit surface 1a. At the moment the middle portion 200 of the ladder 20 contacts the pit surface 1a, the ladder 20 folds down to the pit surface 1a, completing its stowage. After the ladder 20 is stowed, the rope 202 is lowered down to the pit surface 1a.

[0045] As described above, according to Embodiment 1, the device includes: a retractable ladder 20 that is folded and stored in the pit surface 1a of the elevator when not in use, and is stretched in the vertical direction when in use; a pair of mounting arms 21 that are provided at the lower end of the car floor 3 and extend from the lower end toward the pit surface 1a; a pair of engaging portions 22 that are respectively provided on the pit surface 1a side of the mounting arms 21; a fixing portion 201 that is provided on one side of the ladder 20 and fixes one side of the ladder 20 to the pit surface 1a in a rotatable manner; and a pair of engaging portions 23 that are provided on the other side of the ladder 20 and can engage with the engaging portions 22. Thus, a pit ladder device 2 can be realized that does not require a ladder guide rail and a guide rail drive device and can be easily used without affecting the height of the car floor and the weight of the car.

[0046] Furthermore, with the ladder 20 folded into the pit surface 1a, the car floor 3 is moved to a position lower than the lowest level, causing the engaging part 22 to come into contact with the engaged part 23. Thus, the engaging part 22 and the engaged part 23 are engaged. Therefore, when the ladder 20 is not in use, the car floor 3 will not move to a position lower than the lowest level, and the ladder 20 can be stably stored in the pit surface 1a.

[0047] In addition, when using ladder 20, the tension that stretches ladder 20 upward as the car floor 3 rises is applied to ladder 20. As a result, when workers use ladder 20, ladder 20 will not slack in the vertical direction or shift in the horizontal direction, and can be used stably and easily.

[0048] In addition, the mounting arm 21 is fixed to the skirt 4 of the car floor 3, thereby serving as a reinforcing component of the skirt 4, which helps to reduce the cost of the pit ladder device 2.

[0049] In addition, the mounting arm 21 is fixed to the skirt 4 of the car floor 3, but it is not necessary to fix it to the skirt 4. Even if the mounting arm 21 is only fixed to the car floor 3, it will have the same function and effect.

[0050] Industrial availability

[0051] This invention is a pit ladder device for elevators used by workers when entering and exiting the pit from a floor.

Claims

1. A pit ladder device for an elevator, characterized in that, have: A retractable ladder that is folded and stored in the elevator pit when not in use, and extended vertically when in use. A pair of mounting arms are provided at the lower end of the car floor and extend from the lower end toward the pit surface; A pair of engaging portions are respectively disposed on the pit side of the mounting arm; A fixing part, disposed on one side of the ladder, rotatably fixes one side of the ladder to the pit surface; and A pair of engaging parts are located on the other side of the ladder and are capable of engaging with the engaging parts.

2. The elevator pit ladder device according to claim 1, characterized in that, With the ladder folded over the pit surface, the car floor is moved to a position lower than the lowest level, causing the engaging part to abut against the locked part, thereby engaging the engaging part with the locked part.

3. The elevator pit ladder device according to claim 1, characterized in that, When the ladder is in use, the tension that stretches the ladder upwards as the car floor rises is applied to the ladder.

4. The elevator pit ladder device according to claim 1, characterized in that, The mounting arm is fixed to the skirt panel of the car floor.

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