Elevator Pit Ladder System

Abstract

To provide a pit ladder device capable of moving a pit ladder with light force when the pit ladder is moved between a storage position and a use position, and capable of preventing a failure of the pit ladder.SOLUTION: A pit ladder device comprises a pit ladder 12 the upper part of which is supported by a landing sill 7 in use, a fixing part provided on the upper part of the pit ladder, engaged with the landing sill 7 at the use position where the pit ladder is used, and detachably restricting the horizontal movement of the pit ladder, a supporting part 15 extended and provided at a position facing the middle part of the pit ladder on a wall surface 3 on the landing sill 7 side of a hoistway 1 and supporting the falling direction of the pit ladder between the use position and the storage position not interfering with the elevator car and where the pit ladder is stored, a supported part provided in the middle part of the pit ladder and supported by the supporting part, and a movable part (roller) 17 provided on the lower end of the pit ladder, supporting the load acting on the pit ladder, and capable of moving the pit ladder.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This invention relates to an elevator pit ladder system. [Background technology]

[0002] Conventionally, an elevator pit ladder device that can easily move from a landing to a pit ladder has been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2007-276959 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional pit ladder device, when the pit ladder stored in the elevator pit is first used, the other end of the lifting rope is held to raise the pit ladder lying on the pit floor and lift it up. Also, when the pit ladder is stored on the pit floor after use, the other end of the lifting rope is held to return the pit ladder to lying on the pit floor. At this time, when the pit ladder is in an upright state, the weight of the pit ladder is hardly acting on the other end of the lifting rope. However, when the pit ladder is raised from a lying state or returned from an upright state to a lying state, the weight of the pit ladder acts largely on the other end of the lifting rope, so there is a problem that the worker is pulled by the other end of the lifting rope and loses balance, or the other end of the lifting rope comes off the worker's hand, causing the pit ladder to fall naturally to the floor and be damaged.

[0005] The present invention has been made to solve the above problems, and its object is to provide a pit ladder device that allows the pit ladder to be moved with a light force between the storage position and the use position, and also to provide a pit ladder device that can prevent the pit ladder from being damaged when the pit ladder is moved between the storage position and the use position. [Means for solving the problem]

[0006] The pit ladder device of this invention is a pit ladder device used during maintenance work in a pit at the bottom of an elevator hoistway, and comprises: a pit ladder whose upper part is supported on the landing threshold when in use; a fixed part provided on the upper part of the pit ladder, which engages with the landing threshold at the usage position where the pit ladder is used and detachably limits the horizontal movement of the pit ladder; a support part provided on the wall surface on the landing threshold side of the hoistway and extends to a position facing the middle part of the pit ladder, which supports the direction of the pit ladder's fall between the usage position and a storage position where the pit ladder is stored and does not interfere with the elevator car; a supported part provided in the middle part of the pit ladder and supported by the support part; and a movable part provided at the lower end of the pit ladder, which supports the load acting on the pit ladder and allows the pit ladder to move. A control rod, one of which is fixed to the pit ladder and the other of which is arranged horizontally below the landing threshold, and which allows the pit ladder to move when moved horizontally; The present invention is characterized by comprising: Effect of the Invention

[0007] This invention realizes a pit ladder device that allows the pit ladder to be moved with a light force between the use position and the storage position. It also realizes a pit ladder device that can prevent damage to the pit ladder when the pit ladder is moved between the storage position and the use position. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing an elevator pit ladder device (in use) according to embodiment 1 of the present invention. [Diagram 2]FIG. 1 is a plan view showing an elevator pit ladder device (in use) according to embodiment 1 of the present invention. [Diagram 3] FIG. 1 is a side view showing a main part of an elevator pit ladder device (in use) according to embodiment 1 of the present invention. [Figure 4] FIG. 1 is a front view showing an elevator pit ladder device (when stored) according to embodiment 1 of the present invention. [Diagram 5] FIG. 1 is a plan view showing an elevator pit ladder device (when stored) according to embodiment 1 of the present invention. [Figure 6] FIG. 1 is a side view showing a main part of an elevator pit ladder device (when stored) according to embodiment 1 of the present invention. [Figure 7] FIG. 2 is a side view showing a fixing part of the elevator pit ladder device (in use) according to embodiment 1 of the present invention. [Figure 8] FIG. 2 is a side view showing a fixing part of the elevator pit ladder device (when stored) according to embodiment 1 of the present invention. [Figure 9] FIG. 2 is a side view showing a support portion of the elevator pit ladder device according to embodiment 1 of the present invention. [Figure 10] FIG. 2 is a side view showing a holding portion of the elevator pit ladder device (in use) according to embodiment 1 of the present invention. [Figure 11] FIG. 2 is a side view showing a holding portion of the elevator pit ladder device (when stored) according to embodiment 1 of the present invention. [Figure 12] FIG. 11 is a front view showing an elevator pit ladder device (in use) according to embodiment 2 of the present invention. [Figure 13] FIG. 11 is a front view showing an elevator pit ladder device (when stored) according to embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Embodiment 1 1 to 3 are diagrams illustrating an elevator pit ladder device (in use) according to a first embodiment of the present invention, with FIG. 1 being a front view of the pit ladder device 9, FIG. 2 being a side view of the pit ladder device 9, and FIG. 3 being a plan view of the pit ladder device 9. FIG. 4 to FIG. 6 show an elevator pit ladder device (when stored), with FIG. 4 being a front view, FIG. 5 being a side view, and FIG. 6 being a plan view. In the diagrams, a pit 2 is provided at the bottom of a hoistway 1 provided inside a building. A doorway 6 is formed at a landing 4 on each floor of a wall surface 3 forming the hoistway 1, through which passengers get on and off a car 5. A landing threshold 7 protruding into the hoistway 1 is formed at the bottom of the doorway 6. The landing threshold 7 closes the gap between the car 5 and the doorway 6, ensuring the safety of passengers when getting on and off the car 5. A landing door 8 with two doors that swing open is provided at the doorway 6.

[0010] A pit ladder device 9 according to this embodiment is provided on a wall surface 3 of the pit 2. The pit ladder device 9 is arranged on a wall surface 31 on which an entrance / exit 6 is provided. Furthermore, when the pit ladder device 9 is stored in the wall surface 31, it is in a position where it does not interfere with the ascent and descent of the car 5. Furthermore, a safety switch 10 is provided on the wall surface 31 for forcibly stopping the ascent and descent of the car 5 when the pit ladder device 9 is in use. This safety switch 10 is connected to a control panel (not shown) via a signal line 11, and controls the operation of the hoist (not shown).

[0011] The pit ladder 12 is placed in a usage position at the landing threshold 7 when a worker moves between the landing 4 and the pit 2. The usage position at which the pit ladder 12 is used is near the door pocket side of the landing door 8 of the entrance / exit 6. The storage position at which the pit ladder 12 is stored is a direction horizontally away from the usage position along the longitudinal direction of the landing threshold 7 when viewed from the vertical direction, adjacent to the elevator shaft 1 side from the longitudinal direction of the landing threshold 7, and is a position that does not interfere with the ascent and descent of the car 5. The usage position and storage position are also placed at the same height.

[0012] 7 and 8, the upper part of the pit ladder 12 is provided with a fixing part 13 which engages with a groove in the landing threshold 7 to limit the horizontal movement of the pit ladder 12 in the use position. The fixing part 13 is provided with an engagement arm 14 which is detachable from the groove in the landing threshold 7 in the use position. When the pit ladder 12 is in use, the engagement arm 14 is pulled out from the pit ladder 12 side and engages with the groove in the landing threshold 7. When the pit ladder 12 is not in use, the engagement arm 14 is released from the groove in the landing threshold 7 and stored on the pit ladder 12 side.

[0013] Also, in FIG. 9, on the wall surface 31 facing the middle part of the pit ladder 12, a support part 15 that supports the direction of the pit ladder 12's fall is arranged extending horizontally between the use position and the storage position. At the middle part of the pit ladder 12, a supported part 16 that is supported by the support part 15 and prevents the pit ladder 12 from falling is provided. The supported part 16 is supported by the support part 15, and prevents the pit ladder 12 from falling between the use position and the storage position.

[0014] A roller 17 is provided at the lower end of the pit ladder 12, which is rotatable in a direction parallel to the longitudinal direction of the landing threshold 7 when viewed vertically. The roller 17 supports the load acting on the pit ladder 12, and abuts against the floor surface of the pit 2 to movably guide the pit ladder 12 between the use position and the storage position.

[0015] A control rod 18 that enables the pit ladder 12 to be moved is provided under the landing threshold 7. One end of the control rod 18 is connected to the pit ladder 12, and the other end is disposed under the landing threshold 7 in a position within reach from the landing 4. By operating the control rod 18 to pull or push it forward, the pit ladder 12 can be freely moved or stopped between the use position and the storage position.

[0016] 10 and 11, a wall surface 31 facing the control rod 18 is provided with a retaining portion 19 that engages with the control rod 18 and detachably limits the horizontal movement of the control rod 18. When the pit ladder 12 is in the stored position, the control rod 18 engages with the retaining portion 19. When the control rod 18 engages with the retaining portion 19, the pit ladder 12 is retained in the stored position. When the pit ladder 12 is used, the engagement between the retaining portion 19 and the control rod 18 is released.

[0017] Next, the operation of the embodiment 1 configured as described above will be described. First, the holding part 19 is operated from the entrance 6 to release the control rod 18 engaged with the holding part 19, making the control rod 18 movable. The control rod 18 is pulled toward the entrance 6 to move the pit ladder 12 arranged in the storage position horizontally to the use position. The pit ladder 12 moved to the use position pulls out the engagement arm 14 of the fixing part 13, engages with the groove of the landing threshold 7, and is fixed to the landing threshold 7. This restricts the horizontal movement of the pit ladder 12, making it usable. The worker uses the pit ladder 12 to move between the landing 4 and the pit 2. At this time, the safety switch 10 does not detect the pit ladder 12, so the operation of the elevator car 5 is forcibly stopped.

[0018] Next, when the pit work is completed, the pit ladder 12 is moved from the use position to the storage position. First, the pit ladder 12 fixed in the use position releases the engagement arm 14 of the fixed part 13 from the landing threshold 7. Now, the pit ladder 12 is free to move, so the control rod 18 is pushed outward from the entrance 6 to move the pit ladder 12 arranged in the use position horizontally to the storage position. When the pit ladder 12 is moved to the storage position, the pit ladder 12 abuts against the safety switch 10. Finally, the holding part 19 is operated to engage the control rod 18 with the holding part 19. As a result, the safety switch 10 detects that the pit ladder 12 has been arranged in the storage position, and the operation of the pit ladder 12 car 5 is resumed.

[0019] According to the first embodiment as described above, the pit ladder device 9 used during maintenance work in the pit 2 at the bottom of the elevator hoistway 1 comprises a pit ladder 12 whose upper part is supported on the landing threshold 7 when in use, a fixing part 13 provided on the upper part of the pit ladder 12, which engages with the landing threshold 7 at the usage position where the pit ladder 12 is used and detachably limits the horizontal movement of the pit ladder 12, and a fixing part 13 provided on the wall surface 31 on the landing threshold 7 side of the hoistway 1 at a position facing the middle part of the pit ladder 12, which is adapted to engage with the landing threshold 7 at the usage position where the pit ladder 12 is used and detachably limits the horizontal movement of the pit ladder 12, and a fixing part 13 provided on the wall surface 31 on the landing threshold 7 side of the hoistway 1 at a position facing the middle part of the pit ladder 12 and detachably limits the horizontal movement of the pit ladder 12 at the usage position and By providing a support part 15 that supports the direction of the pit ladder 12 falling between a position that does not interfere with the car 5 and a storage position where the pit ladder 12 is stored, a supported part 16 that is provided in the middle of the pit ladder 12 and supported by the support part 15, and rollers 17 that are provided at the lower end of the pit ladder 12 and support the load acting on the pit ladder 12 and enable the pit ladder 12 to move, a pit ladder device 9 can be realized that allows the pit ladder 12 to be moved with little force between the use position and the storage position.

[0020] In addition, the storage position, when viewed vertically, is in a direction away from the usage position along the longitudinal direction of the landing threshold 7, and is adjacent to the elevator shaft 5 side from the longitudinal direction of the landing threshold 7, so that the pit ladder device 9 can be quickly moved from the storage position to the usage position when in use.

[0021] Furthermore, since the use position and the storage position are located at the same height and the support part 15 is arranged horizontally, when the control rod 18 is operated, the pit ladder 12 moves horizontally between the use position and the storage position, so that the pit ladder 12 can be moved with a light force. Furthermore, when the pit ladder 12 is moved between the storage position and the use position, the pit ladder 12 does not naturally fall onto the floor of the pit 2, so a pit ladder device 9 can be realized that can prevent damage to the pit ladder 12.

[0022] In addition, one end is fixed to the pit ladder 12 and the other is arranged horizontally under the landing threshold 7, and a control rod 18 is provided which enables the pit ladder 12 to be moved when moved horizontally. This allows a worker to operate the pit ladder 12 from the usage position to the storage position without leaning over towards the elevator shaft 1, thereby enabling the pit ladder device 9 to be used safely.

[0023] In addition, by providing a retaining portion 19 on the wall surface 31 facing the control rod 18, which engages with the control rod 18 and detachably limits the horizontal movement of the control rod 18, the pit ladder 12 can be held in the stored position when the pit ladder 12 is not in use and the pit ladder 12 can be prevented from coming off the safety switch 10.

[0024] Embodiment 2 Figures 12 and 13 explain a pit ladder device 20 according to embodiment 2 of the present invention, with Figure 12 being a front view of the pit ladder device 20 (in use) and Figure 13 being a front view of the pit ladder device 20 (when stored). In the figures, the pit ladder device 20 according to embodiment 2 of the present invention differs in that the support portion 21 is formed at an incline and has a horizontal surface 24 that supports the pit ladder 23 and an inclined surface 25 that guides the pit ladder 23; other similar parts are given the same symbols and their explanations are omitted.

[0025] The position where the pit ladder 23 is used is the same as in embodiment 1 when the entrance 6 has two side-opening doors. The storage position where the pit ladder 23 is stored is the pit 2 surface where it does not interfere with the ascent and descent of the car 5. The height of the storage position is set lower than the height of the use position.

[0026] Supporting portion 21 that supports the tilting direction of pit ladder 23 is arranged extending from wall surface 31. Supporting portion 21 is arranged inclined downward between the use position and the storage position. Supported portion 22 that is supported by supporting portion 21 and supports the tilting direction of pit ladder 23 is arranged inclined to follow supporting portion 21 when pit ladder 23 is viewed from the front.

[0027] A horizontal surface 24 is provided directly below the use position on the wall surface 31 facing the rollers 17 of the pit ladder 23 to support the load acting on the pit ladder 23. An inclined surface 25 is provided on one side of the horizontal surface 24, which is formed continuously with the horizontal surface 24 and guides the pit ladder 23 movably between the use position and the storage position.

[0028] A control rope 26 that enables the pit ladder 23 to move is provided from the underside of the landing threshold 7 to the hoistway 1 side of the landing 4. One end of the control rope 26 is connected to the pit ladder 23, and the other end is disposed on the hoistway 1 side of the wall 3 that is reachable from the landing 4. When moving the pit ladder 23 from the stored position to the usage position, the pit ladder 23 can be freely moved or stopped by operating the control rope 26 toward the user or by loosening it.

[0029] Next, the operation of the second embodiment configured as described above will be described. First, by pulling the control rope 26 toward the landing 4, the pit ladder 23 arranged in the stored position is supported by the support part 21, and is pulled up while being guided by the inclined surface 25, and moves to the use position on the horizontal surface 24. The pit ladder 23 moved to the use position has the engagement arm 14 of the fixing part 13 pulled out and engaged with the groove of the landing threshold 7, and is fixed to the landing threshold 7. This restricts the horizontal movement of the pit ladder 23, and makes it available for use. The worker uses the pit ladder 23 to move between the landing 4 and the pit 2.

[0030] Next, when the pit work is completed, the pit ladder 23 is returned from the use position to the storage position. First, the pit ladder 23 fixed in the use position is released by releasing the engagement arm 14 of the fixed part 13 from the groove of the landing threshold 7, and is returned to the original position of the fixed part 13. Next, while holding the control rope 26, the worker manually and lightly pushes the pit ladder 23 from the use position toward the storage position. When the pit ladder 23 moves from the horizontal surface 24 to the inclined surface 25, one side of the roller 17 abuts against the inclined surface 25 and moves under its own weight to the storage position. At this time, the worker moves the pit ladder 23 to the storage position while reeling out the control rope 26 with a force that lightly supports it.

[0031] When the pit ladder 23 is placed in the stored position by moving the inclined surface 25 while the supported portion 22 is supported by the supporting portion 21, the pit ladder 23 comes into contact with the safety switch 10 due to its own weight. This detects that the pit ladder 23 has finished being used, and the car 5 becomes usable.

[0032] As described above, according to embodiment 2, the height of the storage position is lower than the height of the use position, the support part 21 is arranged at a downward incline between the use position and the storage position, and the supported part 22 is arranged at a incline so as to follow the downward incline, and is provided extending at a position opposite the roller 17 of the wall surface 31, formed directly below the use position, and abutting against the roller 17 to support the load acting on the pit ladder 23, and a sloped surface 25 formed continuously with one side of the horizontal surface 24 and movably guiding the pit ladder 23 between the use position and the storage position.As a result, the pit ladder 23 moves under its own weight to the storage position while abutting against the sloped surface 25, so that a pit ladder device 20 can be realized that can store the pit ladder 23 with less force than in embodiment 1.

[0033] Furthermore, by setting the inclination angle of the inclined surface 25 to a gentle angle, the force acting on the control rope 26 is reduced when the pit ladder 23 is moved between the use position and the storage position. This prevents the worker from losing balance when operating the control rope 26. Furthermore, the pit ladder 23 will not naturally fall onto the floor of the pit 2 when it is moved between the storage position and the use position. This allows for the realization of a pit ladder device 20 that can prevent damage to the pit ladder 23.

[0034] In addition, the horizontal movement of the pit ladder 23 placed in the storage position is restricted by the inclined surface 25. Therefore, the pit ladder 23 can be prevented from coming off the safety switch 10 without providing a means for holding the pit ladder 23 in the storage position.

[0035] In addition, by providing a control rope that allows the pit ladder 23 to move when moved longitudinally, one side of which is fixed to the pit ladder 23 and the other side is arranged on the elevator shaft 1 side of the entrance / exit 6, the worker can move the pit ladder 23 without leaning out of the entrance / exit 6, thereby enabling the pit ladder device 20 to be used safely.

[0036] The landing door 8 is a two-door single-leaf type, but may be a two-door center-opening type. In the case of a two-door center-opening type, the usage position may be the same as in embodiment 1. Also, the usage position where the pit ladder 12 is used is near the door pocket side of the landing door 8 at the entrance / exit 6, but this is not necessarily the case, and it may be anywhere on the landing threshold 7 as long as it can be moved from the entrance / exit 6 to the pit 2.

[0037] In addition, the storage positions where the pit ladder 12 or the pit ladder 23 are stored are arranged at the same position when viewed from the vertical direction, but they do not necessarily have to be at the same position. For example, in order to set the inclination angle of the inclined surface 25 to be gentle, the storage position in the second embodiment may be set at a position farther or closer to the use position than in the first embodiment.

[0038] Furthermore, the storage position of the pit ladder 23 is the floor surface of the pit 2, but this is not necessarily the case. For example, in order to set the inclination angle of the inclined surface 25 to be gentle, the storage position may be located on the wall surface 31. Furthermore, either a horizontal surface or an inclined surface may be formed at this storage position as a means for storing the pit ladder 23.

[0039] In the first embodiment, a control rod 18 is provided under the landing threshold 7, but this is not necessarily required. If there is no control rod 18, the pit ladder 12 can be moved, for example, by using an operator's hand or a rod-shaped tool for pushing. Also, a holding portion 19 is provided on the wall surface 31, but this is not necessarily required. If there is no holding portion 19, for example, a magnet capable of holding the pit ladder 12 in the storage position may be provided to hold it.

[0040] In the second embodiment, the control rope 26 is provided under the landing threshold 7, but this is not essential. If the control rope 26 is not provided, the pit ladder 12 can be moved by a worker's hand or a rod-shaped tool for lifting. [Explanation of symbols]

[0041] 1 elevator shaft, 2 pit, 3 wall, 31 wall, 4 landing, 5 car, 6 entrance / exit, 7 landing threshold, 8 landing door, 9, 20 pit ladder device, 10 safety switch, 11 signal line, 12, 23 pit ladder, 13 fixed part, 14 engagement arm, 15, 21 support part, 16, 22 supported part, 17 roller, 18 control rod, 19 holding part, 24 horizontal surface, 25 inclined surface, 26 control rope [Industrial Applicability]

[0042] The present invention relates to an elevator pit ladder system.

Claims

1. In a pit ladder device used during maintenance work in a pit at the bottom of an elevator shaft, a pit ladder disposed in use with an upper portion supported on the landing threshold; A fixing portion provided on the upper portion of the pit ladder, which engages with the landing threshold at a usage position where the pit ladder is used, and detachably limits the horizontal movement of the pit ladder; a support portion that is provided on the wall surface of the elevator shaft on the landing threshold side at a position facing the middle portion of the pit ladder, and that supports the direction of the pit ladder's fall between the use position and a storage position where the pit ladder is stored and does not interfere with the elevator car; A supported portion provided in the middle portion of the pit ladder and supported by the supporting portion; A movable part provided at the lower end of the pit ladder, supporting a load acting on the pit ladder and enabling the pit ladder to move; A pit ladder device characterized by comprising a control rod, one of which is fixed to the pit ladder and the other of which is arranged horizontally below the landing threshold, and which enables the pit ladder to be moved when moved horizontally.

2. The pit ladder device described in claim 1, characterized in that the storage position, when viewed vertically, is in a direction away from the use position along the longitudinal direction of the landing threshold, and is adjacent to the elevator shaft side from the longitudinal direction of the landing threshold.

3. 3. A pit ladder device as claimed in claim 1 or 2, characterized in that the use position and the storage position are arranged at the same height, and the support part is arranged horizontally.

4. 2. The pit ladder device according to claim 1, further comprising a retaining portion provided on the wall surface opposite the control rod, engaging with the control rod and removably limiting horizontal movement of the control rod.

5. The height of the storage position is lower than the height of the use position, The supporting portion is disposed with a downward inclination between the use position and the storage position, and the supported portion is disposed with an inclination along the downward inclination, A horizontal surface is provided on the wall surface at a position facing the movable portion, formed directly below the position of use, and abutting the movable portion to support a load acting on the pit ladder; A pit ladder device as described in claim 1 or claim 2, characterized in that it is provided with an inclined surface formed continuously with one of the horizontal surfaces and movably guiding the pit ladder between the use position and the storage position.

6. The pit ladder device according to claim 5, characterized in that it is provided with a control rope, one of which is fixed to the pit ladder and the other of which is arranged on the elevator shaft side of the platform, and which enables the pit ladder to move when moved in the longitudinal direction.

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