CN112368227B

CN112368227B - Pit ladder device of elevator

Info

Publication number: CN112368227B
Application number: CN201880095280.5A
Authority: CN
Inventors: 若森纯子; 镰田紘畅; 森永章吾; 赤尾嘉仁
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-07-09
Filing date: 2018-07-09
Publication date: 2022-06-17
Anticipated expiration: 2038-07-09
Also published as: WO2020012531A1; CN112368227A; JP6991334B2; JPWO2020012531A1

Abstract

A pit ladder device of an elevator capable of easily entering and exiting a pit is obtained. The pit ladder device of the elevator comprises: a cam provided in a car that moves up and down in a hoistway, and moving up and down in the hoistway together with the car; a pit ladder that is displaced between a use position and a storage position; and a displacement device for displacing the pit ladder, wherein the displacement device has an abutting part pressed down by the cam, and the abutting part is pressed down to displace the pit ladder between the use position and the storage position.

Description

Pit ladder device of elevator

Technical Field

The present invention relates to a pit ladder device for an elevator in which a pit ladder is displaced between a use position and a storage position.

Background

Conventionally, there is known a pit ladder device for an elevator, which includes a pit ladder and a support device for supporting the pit ladder, wherein the support device supports the pit ladder such that the pit ladder is displaced between a use position and a storage position. When the operator is about to enter the pit, the operator displaces the pit ladder from the storage position to the use position. When the operator goes outside from the pit, the operator displaces the pit ladder from the use position to the storage position (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 6-146760

Disclosure of Invention

Problems to be solved by the invention

However, when an operator enters or exits the pit, the operator must extend a hand from the landing doorway to hold the pit ladder and displace the pit ladder. Therefore, the problem that the time and labor are wasted when entering and exiting the pit is solved.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a pit ladder apparatus for an elevator, which can easily enter and exit a pit.

Means for solving the problems

The elevator pit ladder device of the invention comprises: a cam provided in a lifting body that lifts and lowers in a hoistway, and that lifts and lowers in the hoistway together with the lifting body; a pit ladder that is displaced between a use position and a storage position; and a displacement device for displacing the pit ladder, wherein the displacement device has an abutting part pressed down by the cam, and the abutting part is pressed down to displace the pit ladder between the use position and the storage position.

Effects of the invention

According to the pit ladder device of the elevator of the present invention, the abutment portion is depressed, and the pit ladder is displaced between the use position and the storage position. Thus, the operator can displace the pit ladder without extending his or her hand from the landing doorway and gripping the pit ladder. As a result, the pit can be easily accessed.

Drawings

Fig. 1 is a plan view showing a key part of an elevator including a pit ladder device of an elevator according to embodiment 1 of the present invention.

Fig. 2 is a side view showing a key part of the elevator of fig. 1.

Fig. 3 is a plan view showing a state after the pit ladder of fig. 1 is displaced.

Fig. 4 is a side view showing a state after the pit ladder of fig. 2 is displaced.

Fig. 5 is a side view showing a key part of an elevator including a pit ladder device of an elevator according to embodiment 2 of the present invention.

Fig. 6 is a front view showing key parts of the elevator of fig. 1.

Fig. 7 is a side view showing a state after the pit ladder of fig. 5 is displaced.

Fig. 8 is a front view showing a state after the pit ladder of fig. 6 is displaced.

Detailed Description

Embodiment 1.

Fig. 1 is a plan view showing key parts of an elevator including a pit ladder device of an elevator according to embodiment 1 of the present invention, and fig. 2 is a side view showing key parts of the elevator shown in fig. 1. The elevator is provided with: a car 2 as a lifting body that lifts and lowers in the hoistway 1; a counterweight 3 serving as a lifting body that moves up and down in the hoistway 1 in the opposite direction to the car 2; and a pit ladder apparatus 4A provided in a pit 11 of the hoistway 1. The key parts of the elevator are shown in fig. 2, seen from the direction of arrow a in fig. 1. In addition, the counterweight 3 is not shown in fig. 2.

The elevator includes a pair of car guide rails 5 for guiding the car 2 and a pair of counterweight guide rails 6 for guiding the counterweight 3. The car 2 is disposed between the pair of car guide rails 5. The car 2 moves up and down in the hoistway 1 along a pair of car guide rails 5. The counterweight 3 is disposed between a pair of counterweight guide rails 6. The counterweight 3 is raised and lowered in the hoistway 1 along a pair of counterweight guide rails 6.

The pit ladder device 4A includes a pit ladder 7 extending in the height direction and a displacement device 8A for displacing the pit ladder 7. Fig. 1 and 2 show a state in which the pit ladder 7 is in the storage position. When the position of the pit ladder 7 is the storage position, the pit ladder 7 is disposed offset from the car 2 when viewed from above. In other words, when the position of the pit ladder 7 is the storage position, the pit ladder 7 is disposed outside the projection plane of the car 2. When the position of the pit ladder 7 is the storage position, the pit ladder 7 is disposed so as to be spaced upward from the pit surface 111, which is the bottom surface of the pit 11.

Fig. 3 is a plan view showing a state where the pit ladder 7 of fig. 1 is displaced, and fig. 4 is a side view showing a state where the pit ladder 7 of fig. 2 is displaced. Fig. 3 and 4 show a state in which the position of the pit ladder 7 is the use position. When the position of the pit ladder 7 is the use position, the pit ladder 7 is disposed so as to overlap the car 2 when viewed from above. In other words, when the position of the pit ladder 7 is the use position, the pit ladder 7 is disposed inside the projection plane of the car 2. When the position of the pit ladder 7 is the use position, the pit ladder 7 hits the pit surface 111 from above.

As shown in fig. 1, 2, 3 and 4, the pit ladder 7 is displaced between a storage position and a use position. The displacement device 8A displaces the pit ladder 7 between a stowed position and a use position.

The shift device 8A includes: a plurality of mounting members 801 fixed to the wall 12 of the hoistway 1; a plurality of shafts 802 provided to the respective mounts 801; and a plurality of mounting arms 803 rotatably supported to the respective shafts 802.

The plurality of mounting members 801 are arranged in a height direction. The mounting member 801 includes: a fixing plate 804 fixed to the wall 12; and a pair of arm portions 805 fixed to the fixing plate 804. The pair of arm portions 805 are disposed apart from each other in the depth direction of the hoistway 1. The pair of arm portions 805 extend from the fixing plate 804 in a direction away from the portion of the wall 12 to which the fixing plate 804 is fixed.

The plurality of shafts 802 are arranged in a height direction. The plurality of shafts 802 are mounted one by one to the plurality of mounts 801. Each shaft 802 is disposed across a pair of arm portions 805. Each shaft 802 extends in the depth direction of the hoistway 1.

The plurality of mounting arms 803 are arranged in a row in the height direction. The plurality of mounting arms 803 are mounted two by two to the plurality of shafts 802. A pair of mounting arms 803 mounted on the same shaft 802 are disposed apart from each other in the depth direction of the hoistway 1. The portion of the mounting arm 803 attached to the shaft 802 becomes the lengthwise middle portion of the mounting arm 803.

A pit ladder 7 is rotatably supported at one end of the mounting arm 803. The pit ladder 7 is displaced between the storage position and the use position by the mounting arm 803 being rotated about the shaft 802. The pit ladder 7 is displaced between the storage position and the use position in a state where the longitudinal direction of the pit ladder 7 coincides with the height direction.

Further, the shift device 8A includes: a mounting member 806 fixed to the wall 12 at a position above the pit ladder 7; a lever 807 rotatably supported by the mounting member 806; and a roller 808 as an abutting portion rotatably supported by the rod 807. The portion of the rod 807 attached to the attachment member 806 becomes the lengthwise middle portion of the rod 807. A roller 808 is rotatably supported at one end of the rod 807.

Further, the shift device 8A includes: a pulley 809 rotatably supported by pit surface 111; and cables 810 disposed across the rod 807 and the respective mounting arms 803. One end of the cable 810 is connected to the other end of the rod 807. The cable 810 is wound around a pulley 809. The other end of each mounting arm 803 is connected to a portion of the cable 810 closer to the other end of the cable 810 than the portion wound around the pulley 809.

The shifting device 8A includes a cam 811 provided on the car 2. The cam 811 is disposed outside the car 2. The cam 811 moves up and down in the hoistway 1 together with the car 2. When the position of the pit ladder 7 is the use position, the roller 808 is disposed in the movable region of the cam 811. Further, in the case where the position of the pit ladder 7 is the storage position, the roller 808 is disengaged from the movable region of the cam 811.

Next, the operation of the pit ladder apparatus 4A of the elevator will be described. When the car 2 is positioned above the lowermost landing doorway 13, the cam 811 is disposed so as to be spaced upward from the roller 808 as shown in fig. 4. In this case, the position of the pit ladder 7 is the use position due to the self weight of the pit ladder 7.

Thereafter, when the car 2 approaches the landing doorway 13 at the lowermost floor, the cam 811 hits the roller 808 from above as shown in fig. 2. Thereby, the roller 808 is pressed by the cam 811. In other words, the roller 808 is pressed down by the power of the car 2. Thereby, the roller 808 is disengaged from the movable region of the cam 811. The roller 808 pressed down by the cam 811 rolls on the cam 811.

The lever 807 is rotated in a direction in which the other end portion of the lever 807 moves upward by the pressing roller 808. When the other end of the rod 807 moves upward, one end of the cable 810 moves upward. When one end of the cable 810 moves upward, a portion of the cable 810 closer to the other end of the cable 810 than the portion wound around the pulley 809 moves downward.

When the portion of the cable 810 on the other end side of the cable 810 than the portion wound around the pulley 809 moves downward, the mounting arm 803 rotates in a direction in which the one end of the mounting arm 803 moves upward. The pit ladder 7 is displaced from the use position to the storage position by moving one end of the mounting arm 803 upward.

On the other hand, when the car 2 moves upward from the lowermost landing doorway 13, the cam 811 moves upward away from the roller 808 as shown in fig. 4. This releases the pressing of the cam 811 by the roller 808.

By the release roller 808 depressing the cam 811, the pit ladder 7 is displaced from the storage position to the use position by the self weight of the pit ladder 7. When the pit ladder 7 is displaced from the storage position to the use position, the mounting arm 803 is rotated in a direction in which one end of the mounting arm 803 is moved downward. When one end of the attachment arm 803 moves downward, a portion of the cable 810 closer to the other end of the cable 810 than the portion wound around the pulley 809 moves upward.

When the portion of the cable 810 on the other end side of the cable 810 than the portion wound around the pulley 809 moves upward, one end of the cable 810 moves downward. When one end of the cable 810 moves downward, the other end of the rod 807 moves downward. The other end of the rod 807 moves downward, and the roller 808 moves upward. Thereby, the roller 808 is arranged to the movable region of the cam 811.

As described above, according to the elevator pit ladder apparatus 4A according to embodiment 1 of the present invention, the roller 808 is pressed down, and the pit ladder 7 is displaced between the use position and the storage position. Thus, the operator can displace the pit ladder 7 without extending his or her hand from the landing doorway 13 to hold the pit ladder 7. As a result, the pit 11 can be easily accessed.

Further, the pit ladder 7 is displaced between the use position and the storage position. Thus, when the pit ladder 7 is provided in the hoistway 1, the hoistway 1 can be prevented from being increased in size.

The cam 811 is provided on the car 2. When the roller 808 is pressed down by the cam 811, the pit ladder 7 is displaced from the use position to the storage position, and when the pressing down of the roller 808 by the cam 811 is released, the pit ladder 7 is displaced from the storage position to the use position. Thus, the pit ladder 7 can be displaced between the storage position and the use position by moving the car 2.

In embodiment 1, the roller 808 that rolls on the cam 811 is described as an example of the contact portion pressed down by the cam 811. However, the abutting body pressed down by the cam 811 is not limited to this, and may be a sliding body that slides with respect to the cam 811.

Embodiment 2.

Fig. 5 is a side view showing key parts of an elevator including a pit ladder device of an elevator according to embodiment 2 of the present invention, and fig. 6 is a front view showing key parts of the elevator shown in fig. 1. The elevator further includes a counterweight buffer 9 provided in the pit 11. In addition, the reuse buffer 9 is not shown in fig. 5. The counterweight buffer 9 is disposed so as to overlap the counterweight 3 when viewed from above. The counterweight 3 during maintenance and inspection of the elevator can be moved to a position below the movable region of the counterweight 3 during normal operation of the elevator.

The pit ladder device 4B includes a pit ladder 7 extending in the height direction and a displacement device 8B for displacing the pit ladder 7. Fig. 5 and 6 show a state in which the position of the pit ladder 7 is the storage position.

Fig. 7 is a side view showing a state in which the pit ladder 7 of fig. 5 is displaced, and fig. 8 is a front view showing a state in which the pit ladder 7 of fig. 6 is displaced. Fig. 7 and 8 show a state in which the position of the pit ladder 7 is the use position.

As shown in fig. 5, 6, 7 and 8, the pit ladder 7 is displaced between a storage position and a use position. The displacement device 8B displaces the pit ladder 7 between a stowed position and a use position.

The shift device 8B includes: a plurality of mounting members 812 secured to the wall 12; a plurality of shafts 813 provided to the respective mounts 812; a plurality of mounting arms 814 rotatably supported by the respective shafts 813; and torsion springs 815 provided to the respective shafts 813.

The plurality of mounting members 812 are arranged in a height direction. The plurality of shafts 813 are arranged in the height direction. The plurality of shafts 813 are mounted one by one to the plurality of mounting members 812. The shafts 813 extend in the depth direction of the hoistway 1.

The plurality of mounting arms 814 are arranged in a height direction. The plurality of mounting arms 814 are mounted two to the plurality of shafts 813. The pair of mounting arms 814 mounted on the same shaft 813 are disposed apart from each other in the depth direction of the hoistway 1.

A pit ladder 7 is rotatably supported at one end of the mounting arm 814. The pit ladder 7 is displaced between the stowed position and the use position by rotation of the mounting arm 814 about the shaft 813. The pit ladder 7 is displaced between the storage position and the use position in a state where the longitudinal direction of the pit ladder 7 coincides with the height direction.

The torsion spring 815 applies an elastic force to the shaft 813 so that the position of the pit ladder 7 becomes the storage position.

The shift device 8B further includes: a roller 816 as an abutting portion provided on the pit ladder 7; and a cam 817 provided to the counterweight 3. The cam 817 is raised and lowered in the hoistway 1 together with the counterweight 3. When the position of the pit ladder 7 is the use position, the roller 816 is disposed in the movable region of the cam 817. When the position of the pit ladder 7 is the storage position, the roller 816 is disengaged from the movable region of the cam 817. The other structure is the same as embodiment 1.

Next, the operation of the pit ladder apparatus 4B of the elevator will be described. In the case where the counterweight 3 is located in the movable region of the counterweight 3 in normal operation of the elevator, as shown in fig. 5, the cam 817 is arranged to be separated upward from the roller 816. In this case, the position of the pit ladder 7 becomes the storage position by the elastic force of the torsion spring 815.

When the counterweight 3 moves to a position below the movable region of the counterweight 3 during normal operation of the elevator, the cam 817 hits the roller 816 from above as shown in fig. 7. Thus, roller 816 is depressed by cam 817. In other words, the roller 816 is pressed down by the power of the counterweight 3. Thereby, the roller 816 is disengaged from the movable region of the cam 817. The roller 816, which is depressed by the cam 817, rolls on the cam 817. In this case, the counterweight 3 hits the counterweight buffer 9 from above.

By pressing the roller 816, the pit ladder 7 is displaced from the storage position to the use position against the elastic force of the torsion spring 815.

On the other hand, when the counterweight 3 returns to the movable region of the counterweight 3 in the normal operation of the elevator, the cam 817 is separated upward from the roller 816 as shown in fig. 5. Thereby, the pressing of the cam 817 by the roller 816 is released. In this case, the counterweight 3 is separated upward from the counterweight buffer 9.

By releasing the depression of the cam 817 by the roller 816, the pit ladder 7 is displaced from the use position to the storage position by the elastic force of the torsion spring 815.

As described above, according to the pit ladder apparatus 4B of the elevator according to embodiment 2 of the present invention, the cam 817 is provided in the counterweight 3. When the roller 816 is depressed by the cam 817, the pit ladder 7 is displaced from the storage position to the use position, and when the depression of the roller 816 by the cam 817 is released, the pit ladder 7 is displaced from the use position to the storage position. Thus, by moving the counterweight 3, the pit ladder 7 can be displaced between the use position and the storage position.

In embodiment 2, a roller 816 that rolls on a cam 817 has been described as an example of a contact portion pressed by the cam 817. However, the abutting body pressed by the cam 817 is not limited to this, and may be a sliding body that slides with respect to the cam 817.

Description of the reference symbols

1: a hoistway; 2: a car; 3: a counterweight; 4A, 4B: a pit ladder apparatus; 5: a guide rail for a car; 6: a guide rail for counterweight; 7: a pit ladder; 8A, 8B: a displacement device; 9: a pair reuse buffer; 11: a pit; 12: a wall; 13: a landing doorway; 111: a bottom pit surface; 801: a mounting member; 802: a shaft; 803: mounting an arm; 804: a fixing plate; 805: an arm portion; 806: a mounting member; 807: a rod; 808: a roller; 809: a pulley; 810: a cable; 811: a cam; 812: a mounting member; 813: a shaft; 814: mounting an arm; 815: a torsion spring; 816: a roller; 817: a cam.

Claims

1. A pit ladder device of an elevator is provided with:

a cam that is provided in a lifting body that lifts and lowers in a hoistway, and that lifts and lowers in the hoistway together with the lifting body;

a pit ladder that is displaced between a use position and a storage position; and

a displacement device to displace the pit ladder,

the displacement device has an abutment portion depressed by the cam, and the pit ladder is displaced between the use position and the storage position by the depression of the abutment portion.

2. The pit ladder apparatus of an elevator according to claim 1,

the lifting body is a car, and the lifting body is a car,

the displacement device displaces the pit ladder from the use position to the storage position when the abutment is depressed by the cam, and displaces the pit ladder from the storage position to the use position when the depression of the abutment by the cam is released.

3. The pit ladder apparatus of an elevator according to claim 1,

the lifting body is a counterweight,

the displacement device displaces the pit ladder from the storage position to the use position when the abutment is depressed by the cam, and displaces the pit ladder from the use position to the storage position when the depression of the abutment by the cam is released.

4. The pit ladder apparatus of an elevator according to claim 3,

the counterweight can move to a position lower than the movable area of the counterweight when the elevator is in normal operation during maintenance and inspection of the elevator,

when the counterweight moves to a position below the movable region, the abutment portion is pressed down by the cam.