KR102488596B1 - Ladder locking unit and ladders for expansion and reverse insert that include them - Google Patents

Abstract

The present invention relates to a ladder locking device, which connects (locks) or separates (locks) a ladder that is drawn out (accommodated) in advance and a ladder that follows (unlocks) by using a simple structure, and interferes with linear motion for withdrawing and storing the ladder. The object of the present invention is to reduce frictional resistance and improve driveability by using rotational motion that does not occur.
Ladder locking device according to the present invention is a ladder locking device of a ladder device in which a plurality of ladders are retractably connected, and is rotated rotatably installed on a two-step ladder between a first-step ladder and a three-step ladder, which are the top of the ladder. A guide and an upper side sliding track and a lower side sliding track formed on the one-stage ladder and the three-stage ladder, respectively, and locked or unlocked opposite to each other from the rotation guide, wherein the rotation guide includes the first to three-stage ladders In the stored state, the first and second ladders are kept in an unlocked state, and at the same time, the second and third ladders are kept in a locked state, and when the first ladder is withdrawn, the third step ladder is used. While the ladder and the locked state are released, the one-step ladder and the locked state are switched, so that the two-step ladder is withdrawn after the one-step ladder is withdrawn, and the two-step ladder and the one-step ladder are stored in reverse order.

Description

Ladder locking device and ladder device for withdrawal and reverse order storage including the same {Ladder locking unit and ladders for expansion and reverse insert that include them}

The present invention relates to an elevated ladder device, and more particularly, to a ladder locking device for connecting (locking) or separating (unlocking) a multi-stage ladder in order to sequentially withdraw and receive it, and a method for withdrawing and storing in reverse order including the same. It's about the ladder device.

This section provides background information related to the subject matter of this application and is not necessarily prior art.

In general, an elevated ladder fire engine equipped with an elevated ladder device is used to extinguish a fire in a high-rise building and rescue lives.

The elevated ladder device mounted on such an elevated ladder fire truck is composed of a unit ladder boom so that it can be stretched (extended and contracted) in the longitudinal direction, and the ladder boom with a small width is relatively large on the inside of the ladder boom It is assembled in a telescopic type that is sequentially slide-inserted into.

On the other hand, the telescopic structure of the conventional elevated ladder device includes a fixed boom rotatably mounted using a rotational support member such as a turntable; a base boom that is movably mounted on the inside of the fixed boom and moves in an extension or contraction direction as tension is applied to a drive wire connected and fixed to one side; It consists of a configuration including a telescoping boom that moves in the direction of extension or contraction as tension is added to the telescoping wire connected and fixed to one side by sliding movement inside the base boom.

The base boom and the telescopic boom are connected by an extension wire and are formed so that they can be simultaneously extended or contracted in the same direction by the movement of the base boom, and the base boom is hydraulically driven. To a drive wire connected to a wire driving device It is formed to move in the direction of extension or contraction according to the direction of the applied tension.

Common withdrawal methods of conventional ladder devices include a simultaneous withdrawal method in which each stage is organically connected and simultaneously withdrawn and a sequential withdrawal method in which one stage is sequentially withdrawn. The simultaneous withdrawal method has the advantage that all stages are simultaneously withdrawn and the speed is fast, but it requires a lot of force to withdraw and has the disadvantage that a specific stage cannot be selectively withdrawn.

On the other hand, the sequential withdrawal method is sequentially withdrawn from the last stage, and has advantages such as increasing the working radius and applying a ladder including a bend, but there is a problem in that the storage order cannot be reversed from the withdrawal order in a general method.

According to US 9,328,557 B2 as a patent document that can confirm the background art of the present invention, in order to make the storage order in the reverse order of the withdrawal in the sequential withdrawal method, a locking device is attached to each stage to enable movement of only specific stages, but the structure Since is somewhat complicated and has a sliding method, deterioration in operability due to friction may occur.

US 9,328,557 B2

The present invention is to solve the problems described above, and connects (locks) or separates (unlocks) a ladder that is withdrawn (accommodated) in advance and a ladder that follows by using a simple structure, and for withdrawing and storing the ladder. The purpose is to provide a ladder locking device that reduces frictional resistance by using rotational motion that does not interfere with linear motion and a ladder device for withdrawing and storing in reverse order including the same.

The present invention is a ladder locking device of a ladder device in which a plurality of ladders are retractably connected, including a rotation guide rotatably installed on a two-stage ladder between a first-stage ladder and a three-stage ladder, which is the uppermost stage among the ladders, The rotation guide maintains the first to third ladders in an unlocked state while the first to third ladders are stored, and simultaneously maintains the second and third ladders in a locked state. When withdrawing the 3-stage ladder and the locked state are released by the 1-stage ladder, while the 1-stage ladder and the locked state are switched to withdraw the 2-stage ladder after the 1-stage ladder is withdrawn, and when storing the 2-stage ladder It is characterized in that the ladder and the one-step ladder are stored in reverse order.

The rotation guide includes an upper connection part and a lower connection part on both sides, and is fixed to the one-step ladder, and an upper clamp and a three-step ladder connected (locked) or separated (unlocked) from the upper connection part of the rotation guide. It is fixed to and characterized in that it comprises a lower side clamp that is separated or connected to the rotation guide opposite to the upper side sliding track.

The upper clamp and the lower clamp are each of a track type including a rail in the width direction into which the upper and lower projections of the rotation guide are movably inserted, respectively.

According to the ladder locking device according to the present invention and the ladder device for withdrawing and storing in reverse order including the same, while the rotation guide rotates by the ladder that precedes (withdraws and stores), the preceding ladder and the lower ladder are connected, while the lower The ladder is separated naturally, and the configuration for connection and separation of the ladder is very simple, so manufacturing is easy and it has the effect of reducing malfunctions and failures. In the process, friction can be minimized, and eventually, drivability is improved, and shaking and noise are reduced during the connection and separation process.

1 is a perspective view of a ladder to which a ladder locking device according to a first embodiment of the present invention is applied.
Figure 2 is a perspective view of a ladder locking device according to a first embodiment of the present invention.
3 to 5 are views showing the expansion and contraction of the ladder according to the ladder locking device according to Example 1 of the present invention, respectively.
3 and 4 are processes in which the 2-step ladder is unlocked from the 3-step ladder while the 1-step ladder and the 2-step ladder are connected,
5 is an operation in which the 2-step ladder is unlocked from the 3-step ladder and the 1-step ladder and the 2-step ladder are withdrawn together.
6 is a view showing a process in which a ladder of withdrawal and storage in reverse order is withdrawn according to the present invention.
Figure 7 is a perspective view of a ladder locking device according to a second embodiment of the present invention.
8 to 10 are views showing the expansion and contraction of the ladder according to the ladder locking device according to the second embodiment of the present invention, respectively.
8 and 9 are processes in which the 2-step ladder is unlocked from the 3-step ladder while the 1-step ladder and the 2-step ladder are connected,
10 is an operation in which the 2-step ladder is unlocked from the 3-step ladder and the 1-step ladder and the 2-step ladder are withdrawn together.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

<Example 1>

As shown in Figures 1 and 2, the ladder locking device according to this embodiment, the upper side sliding track 10 fixed to the back of the one-stage ladder (L1) moves linearly; A rotating guide 20 that is rotatably mounted in front of the two-stage ladder L2 and locked to the upper sliding track 10 that moves forward with the extension of the one-stage ladder L1 and rotates; It is fixed to the front of the three-step ladder (L3) to lock the rotation guide (20) and unlock the rotation guide (20) rotating by the upper side sliding track (10) so that the two-step ladder (L2) It consists of a lower side sliding track 30 that extends together with the first ladder L1, and the first ladder L1 at the top is withdrawn, and then the second ladder L2 and the third ladder L3 are sequentially An example of withdrawal is shown.

The upper side sliding track 10 is installed at the rear of the one-stage ladder L1, and is a position for withdrawing the two-stage ladder L2 after the one-stage ladder L1 is extended.

The upper side sliding track 10 includes an upper rail 11 and an opening 12 to unlock the rotation guide 20 and rotate the rotation guide 20 .

The top rail 11 is preferably formed long along the left and right width directions of the one-step ladder L1.

The upper rail 11 is formed long from the opening 12 along the left and right width directions of the one-stage ladder L1, so that the rotation of the rotation guide 20 is not stopped when the upper sliding track 10 moves forward or backward. It is formed to perform smoothly.

The opening 12 is opened to communicate with the outside toward the front on one side of the left and right sides of the upper rail 11, and guides the upper side protrusion 24 of the rotation guide 20 to be described later into the upper rail 11. .

The opening 12 preferably has a shape in which the width gradually widens as it goes from the inside to the inlet so that the upper protrusion 24 can be inserted without malfunction (a shape with walls on both sides inclined).

The upper sliding track 10 has a larger area and can be fixed to the first ladder L1 through a separate fixing plate 13 fixed to the first ladder L1.

The rotation guide 20 is configured to have a part rotatably connected to the two-step ladder L2, a part connected to the upper sliding track 10, and a part connected to the lower sliding track 30, for example For example, each of the bar-shaped top side connecting portion 21 and the bottom side connecting portion 22 is formed to open at a predetermined angle (right angle), and a rotation pin 23 is formed between them 21 and 22.

The rotation guide 20 can also have a fan shape including the upper side connection part 21 and the lower side connection part 22, and in the case of a bar shape, the rotation is smoother than the fan-shaped plate material due to less friction with the two-step ladder L2. can do.

The upper side connection part 21 includes the upper side protrusion 24 on the upper surface, and the opposite lower side connection part 22 includes the lower side protrusion 25 on the bottom side.

The upper side protrusion 24 and the lower side protrusion 25 are formed in a circular shape for rotation of the rotation guide 20 .

The upper side protrusion 24 and the lower side protrusion 25 are formed at positions suitable for the coupling relationship of the first to third stage ladders L1, L2, and L3.

The rotation pin 23 protrudes between the upper connection part 21 and the lower connection part 22 and is rotatably installed on the two-step ladder L2 through the hinge bracket.

A lower rail 31 and an opening 32 are formed on the lower side sliding track 30 .

The lower rail 31 is formed along the left and right width directions and has the same length as the upper rail 11 of the upper sliding track 10 .

The lower rail 31 is formed long from the opening 32 along the left and right width directions of the three-step ladder L3, so that the rotation of the rotation guide 20 is not stopped when the lower sliding track 30 moves forward or backward. It is shaped to perform smoothly.

The opening 32 of the lower sliding track 30 is the opening of the upper sliding track 10 so that the lower protrusion 25 of the rotation guide 20 can be detached or inserted from the lower rail 31 ( 12) and is formed to open toward the front on the opposite side.

The opening 32 of the lower sliding track 30 preferably has a wider width going from the inside to the entrance.

The lower side sliding track 30 has the same structure as the upper side sliding track 10 and is the same product installed and used symmetrically.

In the lower side sliding track 30, the lower side protrusion 25 of the rotation guide 20 is inserted on the closed side of the lower rail 31, that is, on the opposite side of the open part 32, so that the rotation guide 20 is locked. .

At this time, when the upper and lower protrusions 24 and 25 and the rotation pin 23 located in the upper and lower sliding tracks 10 and 30 are positioned in the vertical direction matching the direction of the ladder withdrawal, the rotation guide 20 Loss of rotational force causes the upper and lower sliding tracks 10 and 30 and the upper and lower protrusions 24 and 25 to be locked, respectively, and when positioned in the vertical direction perpendicular to the ladder withdrawal direction, the upper and lower sliding tracks 10 (30) and the upper and lower side protrusions 24 and 25 are unlocked, respectively.

The lower side sliding track 30 may be fixed to the three-step ladder L3 through a separate fixing plate 33 fixed to the three-step ladder L3 made of a wider area.

The action of the ladder locking device according to this embodiment is as follows.

Figure 6 is shown as an example consisting of a 1-step ladder (L1) to a 4-step ladder (L4), the 4-step ladder (L4) is fixed and not shown in the drawing, but after the withdrawal of the 2-step ladder (L2) 3 steps The upper sliding track, the rotation guide, and the lower sliding track are installed in the two-step ladder (L2), the three-step ladder (L3), and the four-step ladder (L4) so that the ladder (L3) is withdrawn so that they can be locked and unlocked from each other. can

The wire driving device according to the present embodiment includes a driving drum 40 installed on a vehicle body, a driving wire 41 wired from the driving drum 40 and the 1-step ladder L1 to the 4-step ladder L4. .

The drive wire 41 for withdrawal is fixed to the fixture 43 installed at the rear of the 1-step ladder L1, so that the 2-step ladder L2, the 3-step ladder L3, and the 4-step ladder L4 are installed. It is wired in a zigzag form to the guide rollers for withdrawal installed at the front and rear, respectively, and then fixed to the driving drum 40, while the driving wire 42 for accommodation is fixed to the fixture 43, and then the 4-step ladder L4 After being wired through a storage guide roller installed at the rear end, it can be wound around and connected to the drive drum 40 .

That is, when the drive wire 41 for withdrawal is pulled during withdrawal, the first ladder L1 is pulled and drawn out, and when the drive wire 42 for storage is pulled, the three-step ladder L3 in an unlocked state stored first.

1. Sequential withdrawal.

go. Single step ladder withdrawal (see FIGS. 1 and 6).

The first to third ladders L1, L2, and L3 are overlapped, the first ladder L1 is drawn from the second ladder L2, and then the second ladder L2 is drawn from the third ladder L3. .

The driving force of the driving drum 40 is transmitted to the first-stage ladder L1 to withdraw the first-stage ladder L1, and at this time, the upper sliding track 10 installed on the first-stage ladder L1 advances in the withdrawal direction. On the other hand, the rotation guide 20 installed on the two-stage ladder (L2) maintains a fixed state on the lower side sliding track 30 installed on the three-stage ladder (L3).

That is, until the upper protrusion 24 of the rotation guide 20 is inserted into the opening 12 of the upper sliding track 10, the lower protrusion 25 of the rotation guide 20 does not move on the lower sliding track. Since the state of being inserted into the inner end of the lower rail 31 of (30) is maintained, the rotation guide 20 does not rotate and eventually remains locked to the lower side sliding track 300. At this time, the protrusion 25 on the lower end of the rotation guide 20 is in a locked state because it is located in the vertical direction consistent with the rotation pin 23 and the ladder withdrawal direction.

me. Unlock the double step ladder (see FIGS. 3, 4 and 6).

From the moment the first step ladder (L1) is drawn out and the upper end side protrusion 24 of the rotation guide 20 is inserted into the opening part 12 of the upper side sliding track 10, the second step ladder L2 starts as follows. unlocked

While the upper side sliding track 10 advances due to the extension of the one-step ladder L1, the upper side protrusion 24 of the rotation guide 20 is inserted into the opening 12, and even after that, the upper side sliding track 10 ) advances and since the rotation guide 20 can only rotate, the advancement of the upper sliding track 10 is converted into rotation of the rotation guide 20, and the upper rail 11 of the upper sliding track 10 The upper projection 24 of the rotation guide 20 moves according to the rotation guide 20, and at the same time, since the lower sliding track 30 is fixed to the three-step ladder L3 on the opposite side, the lower projection of the rotation guide 20 ( 25) moves along the lower rail 31 so that the rotation guide 20 rotates.

When the rotary guide 20 rotates, the opposite lower end protrusion 25 moves along the lower rail 31 of the lower sliding track 30 toward the opening 32, and the lower protrusion 25 opens. When it matches the part 32, the lock of the two-step ladder L2 is released.

At this time, due to the rotation of the rotation guide 20, the upper protrusion 24 is in a locked state because it is located in the horizontal direction perpendicular to the rotation pin 23 and the ladder withdrawal direction, and the lower protrusion 25 is the rotation pin Since it moved in the horizontal direction perpendicular to (23) and the ladder withdrawal direction, it is in an unlocked state.

all. Two step ladder withdrawal (see FIGS. 5 and 6).

The upper side protrusion 24 of the rotation guide 20 is coupled to the upper rail 11 of the upper side sliding track 10 fixed to the one-stage ladder L1, while the lower side protrusion 25 is a three-stage ladder ( It is a state in which it can be separated from the lower rail 31 of the lower side sliding track 30 fixed to L3).

Therefore, the one-stage ladder (L1) and the two-stage ladder (L2) are combined, and the one-stage ladder (L1) and the two-stage ladder (L2) are withdrawn from the three-stage ladder (L3).

2. Sequential storage (see Fig. 6).

Storage is the reverse order of withdrawal, and the 1-step ladder (L1) and the 2-step ladder (L2) move together in the storage direction, the 2-step ladder (L2) is stored in the 3-step ladder (L3), and then the 1-step ladder (L1) is stored in the two-step ladder (L2).

This operation is in the reverse order of the withdrawal operation, while the upper sliding track 10 and the rotation guide 20 move backward, the lower protrusion 25 of the rotation guide 20 in front of the two-step ladder L2 moves 3 It is inserted into the lower rail 31 through the opening 32 of the ladder L3, and the two-stage ladder L2 continues to move backward, but the rotation guide 20 has the lower projection 25 on the lower sliding track. It moves linearly along the rail 31 of (30) and rotates around the rotation pin 23.

When the rotation guide 20 rotates and the upper side protrusion 24 coincides with the opening 12 of the upper side sliding track 10 fixed to the back of the one-stage ladder L1, the upper side sliding track 10 and When the rotation guide 20 is unlocked, the two-step ladder (L2) is fixed in a state of overlapping the three-step ladder (L3) and only the one-step ladder (L1) moves backward and is accommodated in the two-step ladder (L2).

<Example 2>

As shown in FIG. 7, the ladder locking device according to this embodiment includes an upper sliding track 100 having an upper rail 110, an upper connecting portion 210 and a lower connecting portion 220, and a rotation pin 230 The rotation guide 200 having and the configuration of the lower sliding track 300 having the lower rail 310 is the same as in Example 1, and sliding and rotating along the upper rail 110 of the upper sliding track 100 It further includes a top side sliding block 120, a bottom side sliding block 320 sliding and rotating along the bottom rail 310 of the bottom side sliding track 300, and the top side protrusion of the rotation guide 200 ( 240) and the lower side protrusion 250 are formed in a prismatic shape (an angular shape that is not close to a circle, preferably a quadrangular shape).

In this embodiment, since the coupling relationship with the 1- to 3-step ladder is confirmed through Example 1, the 1- to 3-step ladder is omitted from the drawings.

The upper side sliding block 120 has an open portion formed on the circumference so that the upper side protrusion 240 is coupled and separated, and preferably one of the four surfaces and the bottom surface are open, and the rotation of the rotation guide 200 A movable and rotatable circular shaft pin 121 is included in the upper rail 110 so as not to interfere.

The upper side sliding block 120 is not limited to a closed structure by a three-sided wall, and it is also possible through an inclination such that both facing walls come together toward one end. That is, the widened side of the two walls is a portion into which the upper protrusion 240 is inserted. Therefore, the upper side protrusion 240 has a shape in which the cross-sectional area becomes narrower toward one end. The inclined upper side sliding block 120 can smoothly rotate the rotation guide 200 without the upper side protrusion 240 being separated.

The upper side sliding block 120 is installed (snap ring installation, etc.) so as not to be separated from the upper rail 110 while being able to reciprocate and rotate along the upper rail 110 of the upper side sliding track 100.

The lower side sliding block 320 has one of the four sides and the bottom side open so that the lower side protrusion 250 is inserted, and rotates while being movable on the lower rail 310 so as not to interfere with the rotation of the rotation guide 200. Include circular pins where possible.

It is also possible that both walls of the lower side sliding block 320 are inclined.

The lower side sliding block 320 is also installed so as not to be separated from the lower rail 310 .

What has not been explained in this embodiment is the same as in embodiment 1.

The action of the ladder locking device according to this embodiment is as follows, and the detailed description of the same parts as the above-described embodiment 1 is omitted or briefly described, and only the novel action according to this embodiment will be described in detail.

1. Sequential withdrawal.

go. 1 step ladder withdrawal (see Fig. 7).

When the one-step ladder is pulled out, the upper side sliding track 100 advances toward the rotation guide 200.

me. Unlock the double step ladder (see FIGS. 8 and 9).

As the upper side sliding track 100 advances, the lock of the two-step ladder L2 is released from the time when the upper side protrusion 240 of the rotation guide 200 is inserted into the upper side sliding block 120, and continuously 1 However, the ladder L1 is withdrawn so that the upper side sliding track 100 moves forward and the rotation guide 200 rotates in conjunction with it, and the specific operation is as follows.

When the rotation guide 200 rotates around the rotation pin 230, the upper protrusion 240 also rotates, and the upper sliding block 120 coupled to the upper protrusion 240 guides the shaft pin 121. While rotating in the upper rail 110, it moves along the upper rail 110 to the opposite side. That is, the upper sliding track 100 and the rotation guide 200 are switched to a locked state.

At this time, due to the rotation of the rotation guide 200, the rotation pin 230 and the shaft pin 121 of the upper side sliding block 120 are positioned in the vertical direction consistent with the withdrawal direction of the ladder, so they are in a locked state.

At the same time, on the opposite side, the lower protrusion 250 of the rotation guide 200 is inserted into the lower sliding block 320 of the lower sliding track 300, and then the lower sliding block 320 is inside the lower rail 310. Rotating and moving along the lower rail 310, the rotary guide 200 moves forward, and the moment the opening of the lower sliding block 320 faces forward, the rotary guide 200 is unlocked from the lower sliding block 320 is converted to

At this time, due to the rotation of the rotation guide 200, the rotation pin 230 and the shaft pin (not shown) of the lower side sliding block 320 are located in the horizontal direction perpendicular to the withdrawal direction of the ladder, so that they are unlocked.

all. 2 step ladder withdrawal (see Fig. 10).

Since the rotation guide 200 is fixed to the upper sliding track 100 but unlocked from the lower sliding track 300, the first ladder L1 and the second ladder L2 are pulled out together, and the lower sliding track (300) remains on the three-step ladder (L3).

2. Sequential storage.

Storage is the reverse order of withdrawal, and the 1-step ladder (L1) and the 2-step ladder (L2) move together in the storage direction, the 2-step ladder (L2) is stored in the 3-step ladder (L3), and then the 1-step ladder (L1) is stored in the two-step ladder (L2).

This operation is the reverse order of the withdrawal operation, the upper side sliding track 100 and the rotation guide 200 move backward for storage, and then the lower side protrusion 250 of the rotation guide 200 in front of the two-step ladder L2. ) is inserted into the lower sliding block 320 of the lower sliding track 300, and the two-step ladder L2 continues to move backward, but the rotation guide 200 controls the movement and rotation of the lower sliding block 320. It rotates around the rotation pin 230 through.

While the rotation guide 200 rotates, as shown in FIG. 7 , the opening of the upper sliding block 120 of the upper sliding track 100 in which the upper projection 240 is fixed to the rear of the one-stage ladder L1 moves forward. When facing, the rotation guide 200 is in a locked state with the lower sliding track 300, whereas the upper sliding track 100 is switched to an unlocked state, and thus, the two-stage ladder L2 is a three-stage ladder L3. ) and is fixed in an overlapped state, and only the one-step ladder (L1) moves backward and is accommodated in the two-step ladder (L2).

10,100: upper side sliding track,
11,110: top rail, 12: opening
13: fixed plate,
20,200: rotation guide,
21: lower side connection part, 22: lower side connection part
23: rotation pin, 24,240: upper side protrusion
25,250: lower side protrusion,
30,300: lower side sliding track,
31,310: bottom rail, 32: opening
33: fixed plate,
120: upper side sliding block, 121: axis pin
320: lower side sliding block,

Claims (7)

As a ladder locking device of a ladder device in which a plurality of ladders are retractably connected,
A rotation guide rotatably installed on the second ladder between the first ladder and the third ladder, which is the uppermost step among the ladders, and
It is formed on the one-step ladder and the three-step ladder, and includes an upper clamp and a lower clamp that lock or unlock the rotation guide opposite to each other,
The rotation guide maintains the first to third ladders in an unlocked state and the second and third ladders in a locked state while the first to third ladders are stored,
When the 1-step ladder is withdrawn, the 3-step ladder and the locked state are released by the 1-step ladder, while the 1-step ladder and the locked state are switched, and after the 1-step ladder is withdrawn, the 2-step ladder is withdrawn and stored. The two-step ladder and the one-step ladder are stored in reverse order,
The rotation guide includes upper and lower protrusions on both sides that open at an angle to each other,
The upper clamp is fixed to the one-step ladder, includes an upper rail to which the upper projection of the rotation guide is inserted and moves, and is an upper sliding track that is locked or unlocked with the rotation guide;
The lower clamp is fixed to the three-step ladder and includes a lower rail to which the lower projection of the rotation guide is inserted and moved, and is a lower sliding track that is unlocked or locked with the rotation guide opposite to the upper sliding track. Ladder lock, characterized in that. delete The method of claim 1,
The upper side sliding track includes an opening portion opened toward the upper side protrusion on one side of both sides in the longitudinal direction of the upper rail,
Ladder locking device, characterized in that the lower side sliding track comprises an opening that is open to communicate with the outside on one side of both sides in the longitudinal direction of the lower rail.
The method of claim 1,
The upper side sliding track is movably and rotatably connected to the upper rail and includes an upper side sliding block into which the upper side protrusion is inserted,
The lower sliding track is movably and rotatably connected to the lower rail and includes a lower sliding block into which the lower projection is inserted.
The method of claim 4,
The upper sliding block and the lower sliding block each have a structure in which a portion of the circumference is opened so that the upper and lower projections are coupled or separated, and include shaft pins rotatably and movably connected to the upper and lower rails, respectively Ladder lock, characterized in that for.
A ladder device in which a plurality of ladders are retractably connected,
A multi-stage ladder that is connected to be drawn out and received and driven by extension through a driving source of a driving device;
Including a ladder locking device according to claim 1 for locking and unlocking the ladder,
The ladder lock
An upper clamp installed at the back of the first-stage ladder, which is the uppermost stage among the ladders, a rotation guide rotatably installed in front of the second-stage ladder connected below the first-stage ladder, and a three-stage ladder connected below the second-stage ladder. It includes a lower clamp installed at the front of the ladder,
The rotation guide includes upper and lower protrusions on both sides that open at an angle to each other,
The upper clamp is fixed to the one-step ladder, includes an upper rail to which the upper projection of the rotation guide is inserted and moves, and is an upper sliding track that is locked or unlocked with the rotation guide;
The lower clamp is fixed to the three-step ladder and includes a lower rail to which the lower projection of the rotation guide is inserted and moves, and is a lower sliding track that is unlocked or locked with the rotation guide opposite to the upper sliding track. ,
When the ladder is withdrawn, the upper clamp is locked with the rotation guide installed in front of the two-stage ladder, and the rotation guide and the lower clamp are unlocked to sequentially withdraw from the single-stage ladder. When the ladder is stored, the two-stage ladder is stored in the three-stage ladder, and the lower clamp is locked with the rotation guide, unlocking the rotation guide and the upper clamp, so that the ladder is withdrawn in reverse order. Ladder device of withdrawal and reverse order storage including a ladder locking device, characterized in that stored. The method according to claim 6, wherein the driving device is fixed to the vehicle body and rotates in both directions, and one side is fixed to the back of the uppermost one-stage ladder and wired in a zigzag pattern to the guide rollers for withdrawal installed at the front and ends of the lower ladder, and then the other side A drive wire for withdrawal connected to the drive drum and pulled out from the ladder at the upper end, and a drive wire for storage, one side of which is fixed to the rear of the one-step ladder and the other end connected to the drive drum to receive from the ladder at the lower end A ladder device for withdrawing and storing in reverse order including a ladder locking device, characterized in that it comprises.

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