JPH09315723A - Elevator pit ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit maintenance personnel to move up and down safely and easily and give no obstruction to the elevating movement of an elevator car even when a space between the elevator car and a hoistway wall is small. SOLUTION: A ladder main body which is constituted of a strut 1 and a step 2 is disposed in an elevator hoistway. The ladder main body is fitted on a wall surface 5 of the hoistway by a movable arm 3 and a fixing angle 7 so that it may move freely between a storage position in the vicinity of the wall surface 5 of the hoistway and a using position separated from the wall surface 5 of the hoistway. When the ladder main body is at a using position, the movable arm is in a horizontal posture and covers the notched parts 7c, 7d of the fixing angle 7, therefore, the strut 1 cannot be fixed by a lock bar 8 and can be locked only under a storing condition. The locking condition is detected by a microswitch 9 and elevating movement of the elevator is limited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pit ladder arranged in the pit of an elevator.

[0002]

2. Description of the Related Art Conventionally, a pit ladder of this type of elevator has been constructed as shown in FIGS. Here, FIG. 12 is a front view, FIG. 13 is a side view, and FIG.
FIG. 13 is an enlarged perspective view of a portion A in FIG.

As shown in these figures, this pit ladder consists of columns 101 and steps 102, and is fixed to a wall surface 105 of the elevator hoistway by a fixed angle 104. Usually, the fixed angle 104 is fixed to the wall surface 105 by bolts at a total of four places, that is, two places above and below, as shown in FIG.

The horizontal distance between the step 102 and the wall surface 105 is extremely small, for example, about 50 millimeters. This is because, as shown in FIG. 13, the gap between the wall surface 105 and the end of the sill 111 of the elevator car 110 is narrow, and therefore, if the horizontal distance between the step 102 and the wall surface 105 is too large, the elevator car 110 is lifted and lowered. This is because the end of the threshold 111 collides with the pit ladder.

As described above, the conventional elevator pit ladder is fixed in close proximity to the wall surface of the hoistway because of the installation space. Therefore, when the maintenance person moves up and down the pit ladder, the footrest of step 102 is set. The effective width was small.
For this reason, there is a problem that it is difficult to move up and down and safety is poor.

In order to deal with such a problem, for example, Japanese Patent Laid-Open No. 6-146760 discloses that a pit ladder is made movable and a safety switch is provided at the movable portion so that the lifting operation of an elevator car can be restricted. The movable pit ladder is shown. According to this ladder, the distance between the ladder and the wall can be secured when the ladder is used, which makes it easy for the maintainer to move up and down, while the ladder can be stored close to the wall during the elevator lifting operation, so the distance between the ladder and the wall can be reduced. Even if it is small, it can avoid collision with the elevator car and ladder.

[0007]

In the above movable ladder, the elevator car is prohibited from moving up and down while the ladder is separated from the wall side and is in use and the safety switch is activated. It is possible to prevent the collision with the elevator car and the ladder.

However, since the movable ladder described above is not provided with a lock mechanism for reliably holding the stored state of the ladder, vibration or some kind of vibration may occur when the elevator car is being moved up or down or stopped when it can be moved up or down. It is conceivable that the ladder may move away from the wall and go from being stored to being used. In this case, the safety switch is actuated to stop the elevator car from moving up or down or restrict the start of lifting, so that collision with the ladder is avoided, but passengers are trapped in the elevator car. It can happen. In addition, in that case, the maintenance person must investigate the cause of the elevator car stop and then enter the pit to perform restoration work (work to store the ladder on the wall side), which will ensure smooth operation as an elevator. There was a problem that it caused trouble and lacked reliability.

The present invention has been made in view of the above problems, and an object thereof is to allow a maintenance person to safely and easily ascend and descend even when the space between the elevator car and the hoistway wall is small. Moreover, it is an object of the present invention to provide an elevator pit ladder that does not hinder the lifting and lowering operation of the elevator car.

[0010]

According to a first aspect of the present invention, there is provided a pit ladder for an elevator, wherein a ladder main body is provided in a hoistway of the elevator to allow a person to ascend and descend, and the ladder main body is stored close to a wall surface of the hoistway. Between the position and the use position away from the wall surface of the hoistway, a ladder moving mechanism that is movably attached to the wall surface, a lock mechanism that fixes the ladder body to the storage position, and an operation of the elevator that detects the operation of the lock mechanism. And a lock detection mechanism for outputting a detection signal for limiting the lifting operation.

In this elevator pit ladder, the ladder main body can be stored in a position close to the wall surface of the hoistway when not in use, and can be moved to a position away from the wall surface of the hoistway in use. Then, during storage, the ladder main body is fixed to the storage position by the lock mechanism, and the locked state is detected by the lock detection mechanism. In this lock detection state, the lifting operation of the elevator is limited.

The elevator pit ladder according to claim 2 is the elevator pit ladder according to claim 1, wherein
The lock mechanism can be operated only when the ladder body is in the storage position.

In this elevator pit ladder, the locking mechanism cannot operate when the ladder main body is in the use position, so that an erroneous locking action when the ladder main body is separated from the wall surface is eliminated. As a result, it is possible to avoid a situation in which the lock detection mechanism detects the locked state when the ladder body is away from the wall surface and the elevator is in the operable state.

An elevator pit ladder according to claim 3 is the elevator pit ladder according to claim 1, wherein
The lock mechanism is automatically activated when the ladder body moves to the storage position.

In this elevator pit ladder, the ladder body is automatically locked when the ladder body moves to the storage position, so that forgetting to lock is prevented.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First Embodiment FIGS. 1 to 4 show the construction and operation of an elevator pit ladder according to an embodiment of the present invention. As shown in FIGS. 1 and 2, this pit ladder has two parallel
Movable for connecting between a pillar 1 of the book, a plurality of steps 2 fixedly installed across the pillar 1, an L-shaped fixed angle 4 fixed to a wall surface 5 of the hoistway, and the pillar 1. Arm 3
And The pillar 1 and the step 2 constitute a ladder main body. The fixed angle 4 has a wall 5 on one side of the L shape.
It is fixed to the wall surface 5 by a fixing bolt 10c so as to stand upright and face the vertical direction. One end of the movable arm 3 is rotatably attached to the side surface of the column 1 by a reamer bolt 10a, and the other end of the movable arm 3 is reamer bolt 10a.
It is rotatably attached to the standing portion of the fixed angle 4 by b. Note that such a movable mechanism is shown in FIG.
That is, they are arranged at three places other than the A position.

FIGS. 3 and 4 show the structures of the movable mechanism, the lock mechanism and the lock detection mechanism arranged at the position A in FIG. As shown in these figures,
The movable mechanism includes a “U” -shaped fixed angle 7 fixed to a wall surface 5 of the hoistway, and a movable arm 3 connecting the fixed angle 7 and the column 1. The fixed angle 7 is fixed to the wall surface 5 by the fixing bolt 10c in such a posture that it becomes a "U" shape when looking down from above the elevator hoistway. The movable arm 3 is the same as that shown in FIG. 1, and one end side thereof is the reamer bolt 1
It is rotatably attached to the side surface of the column 1 by 0a,
The other end is rotatably attached to the standing portion of the fixed angle 7 by a reamer bolt 10b.

Two rising portions 7a, 7b of the fixed angle 7
Are formed with notches 7c and 7d corresponding to each of them. In these notches 7c and 7d, as shown in FIG. 4, when the ladder body is in the housed state (that is, when the column 1 and the movable arm 3 are completely upright).
Only the lock bar 8 can be inserted. On the other hand, FIG.
As shown in (4), when the ladder main body is not in the stored state (that is, when the column 1 and the movable arm 3 are not in the upright state), the ladder cannot be inserted. The lock bar 8 is also formed with two cutouts 8a and 8b, so that the two cutouts 7c and 7c of the fixed angle 7 are inserted at the time of insertion.
7d and deeply mesh with each other.

Further, one standing portion 7a of the fixed angle 7
A micro switch 9 is disposed on the outer surface of the lock bar 8 so that its operating piece is pushed when the lock bar 8 is completely inserted into the notches 7c and 7d of the fixed angle 7. The microswitch 9 has a normally-off contact and is connected to an elevator safety circuit (not shown).
Therefore, the lock bar 8 has the cutout portion 7 of the fixed angle 7.
Since the micro switch 9 is in the off state when not inserted into the c and 7d, the elevator cannot operate, and the lock bar 8 is inserted into the cutouts 7c and 7d of the fixed angle 7 and the micro switch 9 The elevator can be operated only when is turned on.

Next, the operation of the elevator pit ladder having such a structure will be described.

When the ladder body is used, as shown in FIGS. 2 and 3, when the support column 1 is pulled away from the wall surface, the movable arms 3 provided at the four positions of the ladder are connected to the reamer bolts 10b. While rotating about the fulcrum as a fulcrum to be horizontal, the pillar 1 is pulled by the movable arm 3 and is separated from the wall surface 5 until the lower end of the pillar 1 hits the pit floor surface 6 (FIG. 2).

In this state, a sufficient distance is secured between the wall surface 5 and the step 2, and the so-called effective legrest width in step 2 is large. You can step on it and safely climb up and down the ladder.

Further, in this state, as shown in FIG. 3, the movable arm 3 has one notch portion 7c of the fixed angle 7.
The lock bar 8 cannot be inserted,
The micro switch 9 holds the off state. For this reason,
An elevator safety circuit (not shown) prevents the elevator from starting and prevents the elevator car from hitting the ladder.

On the other hand, as shown in FIGS. 1 and 4, when a force is applied to the ladder body in the direction of arrow B in FIG. 3, the movable arm 3 moves the support column 1 to the fixed angle 4 or the fixed angle 7. While rotating upward with the attached reamer bolt 10b as a fulcrum, the pillar 1 approaches the wall surface 5, and the back surface of the pillar 1 abuts against the wall surface 5 and stops at a substantially upright position. Therefore, it is possible to secure a sufficient distance between the side surface of the elevator car (not shown) and the step 2 of the ladder, and it is possible to avoid a collision with the ladder when the elevator car is moved up and down.

Further, as shown in FIG. 4, when the ladder body is housed, the movable arm 3 stands upright and the notch 7c of the fixed angle 7 is opened, so that the lock bar to the notches 7c and 7d is opened. 8 insertions are possible. Therefore, the cutouts 8a and 8b of the lock bar 8 are replaced with the cutouts 7 of the fixed angle 7.
The lock bar 8 can be inserted by inserting it in line with c and 7d.
The pillar 1 can be fixed by. At this time, the operating piece of the micro switch 9 is pushed by the lock bar 8 inserted in the notches 7c and 7d of the fixed angle 7,
The contact is turned on. As a result, the elevator safety circuit is released and the elevator is ready for operation.

As described above, in the present embodiment, the elevator is allowed to operate only when the micro switch 9 detects the locked state by the lock bar 8, and the ladder main body is in a state other than the stored state (use). Since the structure is such that the lock bar 8 cannot lock it when it is in the state (or even slightly separated from the wall surface 5), the operation of the elevator can be surely prohibited in a state other than the stored state. That is, if the structure is such that the lock bar 8 can be inserted even when the ladder main body is separated from the wall surface 5, the micro switch 9 is turned on by this, and thus the elevator can operate even if the ladder main body is separated from the wall surface 5. Therefore, the possibility of collision with an elevator car and a ladder cannot be ruled out. Therefore, by adopting a structure in which the lock bar 8 cannot be inserted when the ladder body is in a state other than the stowed state as described above, it is possible to prevent an erroneous locking action by a maintenance person, and to ensure an unexpected elevator accident. Can be prevented.

On the other hand, the main body of the ladder is in the stored state (the column 1 of the ladder 1
When the movable arm 3 is in the upright state), the pillar 1 can be fixed by locking with the lock bar 8, so that the ladder main body is moved from the wall surface 5 by its own weight due to the movement of the elevator or the vibration caused by the earthquake. It is possible to reliably prevent the state of being separated from the stored state to the state shown in FIGS. 2 and 3. As a result, it is possible to prevent an accident in which the ladder body naturally separates from the wall surface 5 and collides with the elevator car during operation of the elevator. However, in this embodiment, even if the maintenance person forgets to lock the lock body 8 after storing the ladder body, the elevator operates because the micro switch 9 is kept off in this state. It is not in a state and in any case there can be no collision between the elevator and the ladder.

Second Embodiment Next, another embodiment of the present invention will be described.

FIGS. 5 and 6 show the essential parts of an elevator pit ladder according to another embodiment of the present invention. Among these, FIG. 5 shows the state when the pit ladder is used, and FIG. 6 shows the state when the pit ladder is stored. In these figures, the same components as those in FIGS. 3 and 4 are designated by the same reference numerals.

Note that these drawings show the structures of the movable mechanism, the lock mechanism, and the lock detection mechanism arranged at the A position in FIG. 12, and the movable mechanism at three positions other than the A position is shown in FIG. And is the same as that shown in FIG.

In the present embodiment, instead of the fixed angle 7 in FIGS. 3 and 4, a fixed angle 12 having a "G" shape when viewed from above is fixed to the wall surface 5 by the fixing bolt 10c.
The one end of the movable arm 3 is rotatably attached to the one upright portion 12a by the reamer bolt 10b. The other end of the movable arm 3 is rotatably attached to the side surface of the pillar 1 of the ladder body by a reamer bolt 10a. One end of the lock bar 13 is rotatably attached to a portion 12b of the other standing portion of the fixed angle 12 which is parallel to the wall surface 5 with a reamer bolt 10d. A notch 1 is formed on the other end of the lock bar 13.
3a is formed, and the upright portion 12 of the fixed angle 12 is formed.
The notch 12c is also formed in a. This notch 12
A micro switch 9 is provided below the c. Other configurations are the same as those in the above-described embodiment (FIGS. 3 and 4).

Next, the operation of the elevator pit ladder thus constructed will be described.

As shown in FIG. 5, when the ladder body is in use, the movable arm 3 becomes horizontal and the notch 12c of the fixed angle 12 is closed, so that the lock bar 13 is engaged with the notch 13a. I can't match. Therefore, the micro switch 9 is kept in the off state and the elevator cannot be started.

On the other hand, as shown in FIG. 6, in the housed state in which the step 2 is brought close to the wall surface 5, the lock bar 1
By rotating 3 in the direction of arrow D using the reamer bolt 10d as a fulcrum, the cutout portion 13a of the lock bar 13 can be engaged with the cutout portion 12c of the fixed angle 12. As a result, the support 1 is supported (locked) by the lock bar 13. At this time, the lock bar 13 pushes the operating piece of the micro switch 9 to turn it on, so that the elevator can be started.

As described above, in this embodiment, as in the case of the above-described embodiments (FIGS. 3 and 4), the lock bar 13 cannot be inserted when the ladder body is in a state other than the housed state. By doing so, it is possible to prevent an accidental locking action by a maintenance person, to prevent an unexpected elevator accident with certainty, and to lock the ladder body by the lock bar 13 when the ladder body is in the stored state. Therefore, it is possible to prevent an accident in which the ladder body naturally separates from the wall surface 5 and collides with the elevator car during the operation of the elevator.

Further, in the present embodiment, the lock bar 1
Since 3 is rotatably attached to the fixed angle 12 by the reamer bolt 10d, unlike the case of the above-described embodiment (FIG. 3), the storage place of the lock bar 13 when unlocked (that is, when the ladder is used) is stored. There is also an effect that it is possible to prevent the lock bar 13 from being lost without consideration.

Third Embodiment Next, another embodiment of the present invention will be described.

FIGS. 7 and 8 show the essential parts of an elevator pit ladder according to another embodiment of the present invention. Of these, FIG. 7 shows a state when the pit ladder is used, and FIG. 8 shows a state when the pit ladder is stored. In these figures, the same components as those in FIGS. 3 and 4 are designated by the same reference numerals.

Note that these drawings show the structures of the movable mechanism, the lock mechanism and the lock detection mechanism arranged at the A position shown in FIG. 12, and the movable mechanism at three positions other than the A position is shown in FIG. And is the same as that shown in FIG.

In this embodiment, instead of the fixed angle 7 shown in FIGS. 3 and 4, a fixed angle 14 having a "6" shape when viewed from above is fixed to the wall surface 5 by the fixing bolt 10c.
The one end of the movable arm 3 is rotatably attached to one of the standing portions 14a by a reamer bolt 10b. The other end of the movable arm 3 is rotatably attached to the side surface of the pillar 1 of the ladder body by a reamer bolt 10a. A portion 14b of the fixed angle 14 which is parallel to the wall surface 5 extends from the tip of the standing portion 14b to the standing portion 14a.
Extends to The central portion of the lock bar 15 is rotatably attached to the central portion of the parallel portion 14b by a reamer bolt 10d. This rock bar 1
A cutout portion 15a is formed on one end side of 5. Also,
A cutout portion 14d is formed in a portion of the standing portion 14a of the fixed angle 14 that protrudes from the portion 14b. The micro switch 9 includes a standing portion 14 a of the fixed angle 14.
The operating piece is disposed so as to project from the portion 14b. Other configurations are the same as those in the above-described embodiment (FIGS. 3 and 4).

Next, the operation of the elevator pit ladder thus constructed will be described.

As shown in FIG. 7, when the ladder main body is in use, the movable arm 3 becomes horizontal and the notch 14d of the fixed angle 14 is closed, so that the lock bar 15 is engaged with the notch 15a. I can't match. Therefore, the micro switch 9 is kept in the off state and the elevator cannot be started. Even if the lock bar 15 rotates in the direction of the arrow E, one end side of the lock bar 15 abuts against the upright portion 14a of the fixed angle 14 and the lock bar 15
The other end does not press the actuation piece of the micro switch 9, so that it does not turn on.

On the other hand, as shown in FIG. 8, in the storage state in which the step 2 is brought close to the wall surface 5, the lock bar 1
The notch 15a of the lock bar 15 can be engaged with the notch 14d of the fixed angle 14 by rotating 5 in the direction of arrow F using the reamer bolt 10d as a fulcrum. As a result, the support 1 is supported (locked) by the lock bar 15. At this time, the other end of the lock bar 15 pushes the operating piece of the microswitch 9 to turn it on, so that the elevator can be started.

As described above, in this embodiment, the same effect as that of the above-described embodiment (FIGS. 5 and 6) is obtained. In other words, by prohibiting accidental lock actions by maintenance personnel, accidental elevator accidents can be reliably prevented,
It is possible to prevent accidents in which the ladder body naturally separates from the wall surface 5 and collides with the elevator car during operation of the elevator. In addition, it is not necessary to consider the storage location of the lock bar 15 when unlocked (that is, when the ladder is used), and the lock bar 15 can be prevented from being lost.

Fourth Embodiment Next, another embodiment of the present invention will be described.

9 to 11 show a main part of an elevator pit ladder according to another embodiment of the present invention. Of these, FIG. 9 shows a state when the pit ladder is used, FIG. 10 shows a state when the pit ladder is stored, and FIG.
Represents a plan view of the state of FIG. 10 seen from above. In these figures, the same components as those in FIGS. 3 and 4 are designated by the same reference numerals.

Note that these drawings show the structures of the movable mechanism, the lock mechanism, and the lock detection mechanism arranged at the position A in FIG. 12, and the movable mechanism at three positions other than the position A is shown in FIG. And is the same as that shown in FIG.

In the present embodiment, the "U" -shaped fixed angle 17 is fixed to the wall surface 5 by the fixing bolt 10c as viewed from above, and one end side of the movable arm 3 is rotated by the reamer bolt 10b on one of the standing portions 17a. It is movably attached. The other end of the movable arm 3 is rotatably attached to the side surface of the pillar 1 of the ladder body by a reamer bolt 10a.

A through hole (not shown) is formed in the standing portion 17a, and the tip end portion 18a of the lock bar 18 is slidably inserted into this hole. The spring mounting portion 18c adjacent to the central portion of the lock bar 18 is formed to have substantially the same diameter as the tip portion 18a, and this portion is slidably inserted into a hole formed in the rising portion 17b of the fixed angle 17.

A knob portion 18d is fixed to the end of the spring mounting portion 18c through a rising portion 17b of the fixed angle 17, and the spring mounting portion 18c and the knob portion 18d form a T-shape. The lock bar 18 can be moved in the direction of pulling out (the direction of the upright portion 17b) by holding the knob portion 18d and pulling. The compression spring 19 is attached to the spring mounting portion 18c of the lock bar 18 in a compressed state.
The whole is always biased toward the standing portion 17a.

The micro switch 20 is disposed on the inner surface of the wall mounting portion of the fixed angle 17, and its operating piece penetrates a through hole (not shown) formed in the standing portion 17b of the fixed angle 17. It projects to the outer surface of the standing portion 17b. This operating piece is pushed when the knob portion 18d of the lock bar 18 moves to a state where it comes into contact with the standing portion 17b to turn on the contact of the micro switch 20. Other configurations are the same as those in the above-described embodiment (FIGS. 3 and 4).

Next, the operation of the elevator pit ladder thus constructed will be described.

As shown in FIG. 9, when the ladder main body is in use, the movable arm 3 becomes horizontal and closes the through hole (not shown) of the standing portion 17a of the fixed angle 17,
The tip portion 18a of the lock bar 18 abuts on the movable arm 3 and cannot project from the through hole. For this reason, the lock bar 18 cannot move further in the direction of the upright portion 17a, and the knob portion 18d is held in a state of being separated from the upright portion 17b of the fixed angle 17.
Therefore, the knob portion 18d does not push in the actuating piece of the micro switch 20, and the micro switch 20 holds the off state, so that the elevator holds the non-startable state.

On the other hand, as shown in FIG. 10, step 2
When the housing 1 is brought close to the wall surface 5, the through hole (not shown) formed in the standing portion 17a of the fixed angle 17 is opened. Therefore, the tip portion 18a of the lock bar 18 is
Protrudes from the surface of the upright portion 17a, and the entire lock bar 18 is automatically pushed by the compression spring 19 in the direction of the upright portion 17a. As a result, the column 1 is supported (locked) by the tip portion 18a of the lock bar 18. At this time, the knob portion 18d of the lock bar 18 also moves to a position where it abuts against the standing portion 17b of the fixed angle 17, so that the knob portion 18d pushes the operating piece of the microswitch 20 to turn it on, whereby the elevator can be started. .

As described above, in the present embodiment, the lock bar 18 is constantly biased by the compression spring 19 toward the lock position so that the lock is automatically locked when the ladder main body is changed from the use state to the storage state. Since this is detected by the micro switch 20 so that the elevator can be started, the maintenance person does not need to perform a special locking action. That is, by simply storing the ladder main body on the wall surface 5 side, the lock can be achieved and the elevator can be activated. Therefore, in addition to the effects of the above-described embodiment (FIGS. 5 to 8), it is possible to avoid the situation in which the elevator is left in a non-startable state due to forgetting to lock by a maintenance person or the like.

The present invention has been described above with reference to some embodiments, but the present invention is not limited to these embodiments, and various modifications can be made within the equivalent range. For example, in the above-described embodiment, the lock mechanism and the lock detection mechanism are provided only at the upper left one position (position A) among the four positions of the ladder body in FIG. 12, but the other three positions. It may be modified to provide the lock mechanism and the lock detection mechanism in any of the above. Further, it may be provided at two or more locations among these four locations. Further, the movable mechanism shown in FIGS. 1 and 2 may be provided in addition to the above-mentioned four places.

In each of the above embodiments, the micro switch is used as the lock detecting mechanism.
Other types of sensors (such as optical sensors) may be used. Further, the arrangement position of the micro switch is not limited to the position shown in each of the above-mentioned embodiments, and it can be attached to another position as long as the lock by the lock bar can be reliably detected. is there.

[0059]

As described above, according to the elevator pit ladder of the first aspect, the ladder body can be stored in a position close to the wall surface of the hoistway when not in use, and from the wall surface of the hoistway when in use. Since it can be moved to a distant position, even if the distance between the elevator car and the wall surface of the hoistway is small, it does not interfere with the elevator's lifting operation and a sufficient distance between the ladder and the wall surface is secured. can do. This makes it easy for maintenance personnel to move up and down when using the ladder. In addition, the ladder body is locked when it is stored, and the elevator movement is limited by detecting the locked state, so the ladder body returns from the stored state to the use state. It is possible to reliably avoid an accident in which the elevator collides with the elevator, and to ensure safe operation of the elevator.

According to the elevator pit ladder of the second aspect, in the elevator pit ladder of the first aspect, the ladder body is configured to be locked only when it is in the storage position. Erroneous locking actions away from are eliminated. This allows
It is possible to avoid a situation in which the elevator becomes operable and collides with the ladder when the ladder main body is in the use state, so that safer operation of the elevator can be ensured.

According to the elevator pit ladder of the third aspect, in the elevator pit ladder of the first aspect, when the ladder body is moved to the storage position, it is automatically locked. Can be prevented. As a result, it is possible to avoid a situation in which the elevator cannot be started because the maintenance person forgets to lock the elevator.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main structure of a pit ladder of an elevator according to an embodiment of the present invention when the pit ladder is stored.

FIG. 2 is a perspective view showing a structure of a main part when the pit ladder of the elevator according to the embodiment of the present invention is used.

FIG. 3 is a perspective view showing another main structure when the pit ladder of the elevator according to the embodiment of the present invention is used.

FIG. 4 is a perspective view showing another main part structure when the pit ladder of the elevator according to the embodiment of the present invention is stored.

FIG. 5 is a perspective view showing a main structure of a pit ladder of an elevator according to another embodiment of the present invention when in use.

FIG. 6 is a perspective view showing a main structure of a pit ladder of an elevator according to another embodiment of the present invention when the pit ladder is stored.

FIG. 7 is a perspective view showing a main structure when using a pit ladder of an elevator according to still another embodiment of the present invention.

FIG. 8 is a perspective view showing a main structure of a pit ladder of an elevator according to another embodiment of the present invention when the pit ladder is stored.

FIG. 9 is a perspective view showing a structure of a main part when an pit ladder of an elevator according to another embodiment of the present invention is used.

FIG. 10 is a perspective view showing a main structure of a pit ladder of an elevator according to another embodiment of the present invention when the pit ladder is stored.

11 is a plan view of a main structure of a pit ladder of the elevator shown in FIG.

FIG. 12 is a front view showing the overall configuration and arrangement of a conventional elevator pit ladder.

13 is a side view showing the overall configuration and arrangement of the pit ladder of the elevator shown in FIG.

14 is a perspective view showing a main structure of a pit ladder of the elevator shown in FIG.

[Explanation of symbols]

1 support, 2 steps, 3 movable arms, 4, 7, 1
2, 14, 17 fixed angle, 5 wall surfaces, 6 pit floor surface, 8, 13, 15, 18 lock bar, 9, 20
Micro switch, 19 compression springs.

Claims (3)

[Claims] 1. A ladder main body, which is provided in a hoistway of an elevator and allows a person to ascend and descend, and between the storage position close to the wall surface of the hoistway and the use position away from the wall surface of the hoistway. A ladder moving mechanism that is movably attached to the wall surface with a lock mechanism, a lock mechanism that fixes the ladder body to the storage position, and a lock that detects the operation of the lock mechanism and outputs a detection signal for restricting the elevator up and down movement. An elevator pit ladder characterized by having a detection mechanism. 2. The elevator pit ladder according to claim 1, wherein the lock mechanism has a structure that can operate only when the ladder body is in the storage position. 3. The elevator pit ladder according to claim 1, wherein the lock mechanism has a structure that automatically operates when the ladder body moves to the storage position.