JPH01244097A - Trap ladder structure - Google Patents

Abstract

PURPOSE:To realize, with simple operation, safe, quick and smooth installation and retraction of a combined ceiling ladder structure, by providing an electric traction device, with which opening and closing of a canopy and extension and retraction of the ladder structure consisting of fixed, sliding and foldable ladder members are operated. CONSTITUTION:With the operation of an electric traction device, a sliding ladder member 30, housed in a ladder housing frame body 3, of a combined ceiling ladder structure starts to extend, and a canopydoor 5 in the ceiling opens being actuated by a canopydoor-opening- and-closing lever 17 as rise-and-fall footboards 39 rise one after another. The canopydoor 5 is then restrained by foldable links 11 and 14 as it reaches to the fixed angle. Then, the sliding ladder member 30 further extends, sliding over a fixed ladder member 29, and the electric traction device stops its operation as the sliding ladder member reaches to the fixed position. A foldable ladder member 31 is then unfolded. At retracting, the foldable ladder member 31 is folded first, and by the operation of the electric traction device, the sliding ladder member 30 starts to retreat with the rise-and-fall footboards 39 fallen one after another. When the sliding ladder member 30 reached to the fixed position, the canopydoor-opening-and- closing lever 17 works. Then, the canopydoor 5 is closed by the interlocking action of the foldable links 11 and 14 and a rotary obturating motion that is in constant action.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a ladder that is attached to a doorway provided in the ceiling to communicate between an attic space and a living room space, the ladder storage frame for being attached to the ceiling. A ceiling ladder in which an extendable ladder assembly is fixed on a canopy that can be opened and closed to close an opening on the living room side of the body, and can be lowered and extended toward the living room side by opening the canopy. It is related to the device.

(Prior Art) This type of ceiling ladder device includes a ladder storage frame that is rectangular in plan and has an open top and bottom surface, and one end of the ladder storage frame that opens and closes the opening 11fjF on the bottom of the ladder storage frame. A canopy supported by the ladder storage frame as an opening/closing center, and a ladder attached to the upper surface of the canopy so as to be folded so as to extend toward the free end of the canopy and to be stored in the ladder storage frame. The canopy closing rotational force applied by a tension spring is opposite to the canopy opening rotational force due to the own weight of the canopy and ladder assembly when the canopy starts to be opened. is large, and after the two rotational forces are balanced in the process of opening the canopy, the ladder storage frame is suspended by a suspension means that makes the rotational force for opening the canopy larger than the rotational force for closing the canopy. The canopy can be opened and closed with a small amount of operating force.

(Problems to be Solved by the Invention) However, the ceiling ladder device configured as described above has a drawback in that the operator must apply operating force when opening and closing the canopy.

Furthermore, if the canopy opening angle at which the canopy opening rotational force and the canopy closing rotational force are balanced is set small, the canopy can be opened to the balanced opening angle by applying a slight pulling force when opening the canopy. From the equilibrium position to the maximum opening angle, the canopy opens forcefully due to rotational force and inertial force, causing inconveniences such as damage to the center of rotation of the canopy and the possibility of collision with the operator. When storing the ladder, it is necessary to apply a large upward force to return the ladder from the maximum open angle to the angle where the rotational force is balanced, which impairs work efficiency.

Moreover, contrary to the above, if the canopy opening angle at which the canopy opening rotational force and the canopy closing rotational force are balanced is set large, a large pulling force must be applied when opening the canopy, and the storage has the disadvantage that the canopy collides with the ceiling with force.

The present invention has been made in view of the above-mentioned conventional drawbacks, and includes:
To provide a ceiling ladder device capable of safely and smoothly opening and closing a canopy with a small electric opening/closing driving force without applying any artificial opening/closing operation force, and furthermore, capable of extending and folding the ladder in a stable state. The purpose is to

(Means for Solving the Problems) A ceiling ladder device for achieving the above object includes a ladder storage frame body having a rectangular planar shape formed by a pair of opposing end plates and side plates, and having an open upper and lower surface. , which is stored in this ladder storage frame, and has a fixed tread stepped thereon, and a fixed tread stepped at one end of a sliding ladder that extends and contracts by sliding on the fixed ladder. Folding ladders are arranged in a row so as to be freely foldable, and the fixed ladder has an undulating tread that can be raised and lowered so that it stands up when the sliding ladder slides and extends, and the tread can be set on an extension of the step of the fixed tread. A canopy to which the provided ladder assembly and a fixed ladder of the ladder assembly are fixed, is provided with electric traction means capable of pulling the sliding ladder in the sliding direction, and closes an opening surface on the lower surface of the ladder storage frame. The canopy is pivotably opened and closed on the inner surfaces of both side plates of the ladder storage frame so as to rotate about a horizontal rotation axis provided on the opposite side of the extension direction of the ladder assembly. At the same time, a closing rotational force applying means is provided around the pivot portion to always apply a rotational force in the direction of closing the canopy, and a closing rotational force applying means is provided around the pivot portion, and a closing rotational force applying means is provided around the pivot portion, and a closing rotational force applying means is provided around the pivot portion, and a closing rotational force applying means is provided around the pivot portion, and The inner surface of both side plates,
They are connected by a bending link that is bendable and regulates the opening angle of the canopy, and the end of the fixed ladder near the center of rotation of the canopy and the bending part of the bending link are connected so as to be bendable by a lever for opening and closing the canopy. The connecting part between the canopy opening/closing lever and the fixed ladder moves in the sliding direction following the sliding movement of the sliding ladder, and is engaged so that the following is released at a predetermined opening angle of the canopy. It is characterized by

(Function of the Invention) In the ceiling ladder device of the present invention configured as described above, the electric traction means is operated when the canopy is opened and the ladder assembly is extended and installed, and when the extended ladder assembly is stored. be done.

First, when the electric traction means is operated to extend and install the ladder assembly, a traction force in the extension direction acts on the sliding ladder of the ladder assembly stored in the ladder storage frame, causing the sliding ladder to move into the fixed ladder. By means of a lever for opening and closing the canopy which, at the same time, engages the fixed ladder and follows the sliding movement of the sliding ladder as it slides in the direction of extension on the top.

A force is applied to the canopy to open it around the pivot point, and by sliding in the extension direction of the sliding ladder, the undulating tread supported by the fixed ladder is erected. You will be able to do it.

Therefore, as the sliding ladder slides in the extension direction, the undulating step plates are sequentially raised, and the canopy is opened by overcoming the rotational force in the direction of closing the canopy by the closing rotation force applying means.

Then, at the time when the canopy is opened until the opening angle is restrained by the bending link, the following of the canopy opening/closing lever is released, and after that, only the sliding ladder slides in the extension direction,
When the electric traction means is extended to a predetermined position, the driving of the electric traction means is stopped. At this point, the folding ladder that is foldably connected to the extension direction end of the sliding ladder is extended.

Next, when storing the extended ladder assembly, first fold the folding ladder and stack it on the sliding ladder, and then operate the electric traction means.A traction force opposite to the above will be applied to the sliding ladder. hand,
The sliding ladder slides in the direction of shortening, and the undulating treads of the upright shape 78 are successively laid down, and when the ladder is shortened to a predetermined position, the lever for opening and closing the canopy moves in the direction of shortening of the sliding ladder. It will now follow your movement.

This follow-up movement of the canopy opening/closing lever in the shortening direction causes the bent portion of the bending link to be pulled. As a result, a canopy closing rotation force is applied with the rotation center as a fulcrum, and the canopy is closed in conjunction with the closure rotation force that is always acting by the closure rotation force applying means, and the ladder assembly fixed to the canopy is closed. The body is now stored within the ladder storage frame.

(Example) An example of the ceiling ladder device according to the present invention will be described based on the drawings.

FIG. 1 is a partially cutaway schematic exploded view of the ceiling ladder device of the present invention, FIG. 2 is a plan view of the ladder storage frame portion, and FIG. 3 is a plan view of the canopy portion.

As shown in FIGS. 1 to 3, the ceiling ladder device of the present invention includes a ladder storage frame 3, a ladder assembly 4 stored in the ladder storage frame, and a ladder assembly 4. is fixed thereto, and a canopy 5 that opens and closes an opening on the lower surface of the ladder storage frame 3 by rotating it around a water-moisture central axis at one end.

The ladder storage frame 3 includes a pair of opposing end plates 1, 1, 1, and 1, respectively. 1 and the side plates 2.2, the planar shape is rectangular and the upper and lower surfaces are open, and a rotation center receiving hole 6 is bored below one end of the side plates 2, 2, and an opening in the lower surface. A closing edge 7 that prevents upward rotation of the canopy 5 is protruded from the inner edge of the side plate 2.2, and the other end of a gas spring 8 serving as a closing rotation force applying means is mounted on the inner surface of the side plate 2.2 near the other end. A spring support bracket 9 and a bending link 10
An upper arm pivot fitting 12 for pivotally connecting the end of the upper arm 11 and a lock receiving fitting 13 for supporting the rotating end of the ladder assembly 4 are fixed.

This lock receiving fitting 13 includes a guide slope 13a and a horizontal support surface 13b.

In addition, as shown in FIGS. 1 and 2, the bending link 10 has an upper arm 11 and a lower arm 14 connected to each other by a pin LOa so as to be bendable, and is supported by a support shaft 15 below this bending part. The other end of the canopy opening/closing lever 17, which has an engaging roller 16 at one end, is connected with a pin 10b.

As shown in FIGS. 1, 3, and 4, the canopy 5 has a size that closes a portion of the lower surface of the ladder storage frame 3,
A rotation center hole 18 is bored at an end position corresponding to the rotation center receiving hole 6 of the side plate 2.2, and one end of the gas spring 8 is pivotally mounted above the rotation center hole 18. By fixing the support fitting 19 and pivotally connecting the rotation center axis A to the rotation center hole 18 and the rotation center receiving hole 6, the ladder storage frame 3 can be opened and closed.

Lower arm pivot fittings 20 for pivotally attaching the lower arms 14 of the bending link IO are fixed to both sides of the open/close free end of this canopy 5, and uppermost fixed step plates 21 are fixed to both sides of the pivoting center side. A forward/reverse rotation motor 2, which is a drive source of the electric traction means, is connected between the footboard construction arms 22 that support the construction of the footboard.
3 are fixed respectively.

The support fitting 19 that supports one end of the gas spring 8 is equipped with a slider 19a that pivots one end of the gas spring 8. By moving the slider 19a with a screw #19b, the gas spring 8 can be moved. The position where the force is applied can be changed and adjusted upward from the rotation center axis A.

Further, as shown in FIG. 4, a horizontal traction shaft 24 is installed on the tread plate installation arm 22, and a traction drum 25 is attached to both ends of the tread plate installation arm 22. 26.27.

As shown in FIG. 1, FIG. 3, and FIG. 6 to FIG.
A folding ladder 31 having fixed treads 28b is foldably connected to one end of the sliding ladder 30 which extends and contracts by sliding on the fixed ladder 29. Base frame 3
It is fixed to the canopy 5 with a fixing metal fitting 33 fixed to the canopy 2 so that the extending direction is in the direction of the open/close free end of the canopy 5.

``And, as shown in FIG.
．． 61 are connected to each other with a connecting pin 62, and the connecting metal A61
A latch 64 pivotally connected to the connecting fitting 60 is hung on a latch pin 63 protruding from the holder to maintain the straight state.

Furthermore, the sliding structure between the fixed ladder 29 and the sliding ladder 30 is as follows:
As shown in FIGS. 6 and 8, a base rail 34 with a C-shaped cross section is fixed along the upper edge of the outer surface of the sliding base frame 32 on both sides of the fixed ladder 29, and a handrail frame of the sliding ladder 30. A sliding rail 36 with a C-shaped cross section fixed along the lower edge of each rail 34.35 is gripped by a sliding force 8-38 having a slide roller 37 rolling in a C-shaped groove of each rail 34.36. It looks like this.

Further, as shown in FIGS. 7 and 8, there is a space between the sliding base frames 32 and 32 of the fixed ladder 29 that stands up when the sliding ladder 30 slides and extends and extends over the stepped extension of the fixed tread 28a. An undulating tread plate 39 that can be raised and lowered is provided so that the tread plate is stepped.

This undulating step board 39 is fixed to a support arm 41 of a rotary support arm 42 formed into an L shape by a fifth arm 40 and a support arm 41.
The rotating support arm 42 is pivotally connected to a support bracket 43 fixed to the inner surface of the sliding base frame 32 with a pin 44 so that the fifth arm 40 protrudes from the upper edge of the sliding base frame 32 when the rotating support arm 42 is laid down. .

The inner surface of the handrail frame 35 of the sliding ladder 30 that slides on the sliding base frame 32 is provided with five arms 4 of the rotating support arm 42 when sliding.
A pin 45 for undulation operation corresponding to 0 is provided to protrude in the horizontal direction.

In addition, traction wire trochanters 46 are attached to both ends of the inner surface of the sliding base frame 32 (see FIGS. 6 and 7), and the sliding ladder 30
On the inner surface of one end of the handrail frame 35.

A pin fixing metal fitting 48 having protruding wire fixing pins 47a and 47b is fixed, and as shown in FIG. The wire trochanter 46 for pulling the end
At the same time, the other end is fixed to the wire fixing pin 47a.

Further, on the outside of one end of the sliding ladder 30, there is shown a screen shown in FIG.

As shown in FIG. 6, a following means B is provided for moving the canopy opening/closing lever 17 in the sliding direction following the sliding movement of the sliding ladder 30.

This follow-up means B includes a support fitting 50 fixed to the outside of the handrail frame 35, a latch A52 having a hook 51 having a guide slope 51a at the tip, a hook 53 for swinging the hook 52, and a hook A52. Cam plate 5 forming a contact end 54a
4 are coaxially connected, and the rear end of the cam plate 54 and the support fitting 50 are connected by a spring 55 in order to maintain the contact end 54a of the cam plate 54 at the lower pivot position. The hook 51 of the latch 52 is hung on a support shaft 15 that connects an engaging roller 16 disposed within the base rail 34 and one end of a lever 17 for opening and closing the canopy. A release fitting 5 is provided at one end of the foundation rail 34 so that the guide slope 51a of the latch A52 rides on it when the sliding ladder 30 is shortened to release the hook 51 from the support shaft 15.
6 is fixed, and on the outer surface of the sliding base frame 32 of the fixed ladder 29 and on the movement line of the cam plate 54, the canopy 5 hits the contact end 54a of the cam plate 54 at the maximum open position. A release pin 57 is provided protrudingly.

In addition, the handrail frame 35 of the sliding ladder 3o in FIGS. 1 and 6
A locking shaft 58 horizontally protruding from the outer surface of the ladder assembly 4
When the lock bracket 13 is placed inside the ladder storage frame 3,
The guide slope 13a is provided next to the guide slope 13a.

Next, the connection of the ceiling ladder device according to the above embodiment will be summarized.

First, the ladder storage frame 3 and the canopy 5 are arranged so that the rotation center hole 6 of the ladder storage frame 3 matches the rotation center hole 18 of the canopy 5 to which the ladder assembly 4 is fixed, and the rotation center It can be opened and closed by being pivotally connected through the shaft A.

The inner surfaces of the side plates 2, 2 are provided with a rotation center axis A on the canopy 5.
The other end of the gas spring 8 is pivotally supported, and the other end of the gas spring 8 is fixed to the canopy 5 to support the rotation center axis A. It is pivotally attached to a support fitting 19.

Further, the free end of the upper arm 11 of the bending link 10, in which the upper arm 11 and the lower arm 14 are refractably connected with the pin 10a, is connected to the steel plate 2.
．． At the same time, the free ends of the lower arms 14 of the bending links 10 are pivotally connected to the lower arm pivot fittings 2° fixed to both sides of the opening/closing free ends of the canopy 5. An engaging roller 16 at the free end of the canopy opening/closing lever 17 pivoted below the bending section is engaged in a base rail 34 that is fixed to the fixed ladder 29 of the ladder assembly 4.

Further, the traction wire 4 is wound around a traction drum 25 driven by a forward/reverse rotation motor 23 fixed to the canopy 5.
Both ends of the wire 9 are fixed to the sliding ladder 30 by being wrapped around a traction wire trochanter 4 supported by the sliding base frame 32 of the fixed ladder 29 .

Next, the operation of the ceiling ladder device configured as described above will be explained based on FIGS. 9 to 12.

First, FIG. 9 shows a state 8 in which the ladder assembly 4 fixed to the canopy 5 is stored and locked within the ladder storage frame 3 (position indicated by a two-dot chain line).

In this state, the canopy opening rotational force around the rotation center axis A due to the weight of the ladder assembly 4 and the canopy 5, and the opposite rotational force due to the gas spring 8, which is slightly smaller than the canopy opening rotational force, i.e. The lock shaft 5 protruding from the outside of the sliding ladder 30 of the ladder assembly 4 acts on the canopy closing rotation force.
8 is fixedly supported on the horizontal support surface 13a of a lock receiving fitting 13 provided on the inner surface of the side plates 2, 2 of the ladder storage frame 3, thereby stably maintaining the storage state.

At this time, the support shaft 1 is attached to the canopy opening/closing lever 17 which is pivotally attached to the bent part of the bending link lO which is bent in two.
The engagement roller 16 supported via the base rail 34 fixed to the sliding base frame 32 of the fixed ladder 29
The sliding ladder 3 is engaged at the end on the rotation center side.
The latch fitting 52 of the following means B installed on the base rail 34 is pushed up by the release fitting 56 fixed to the starting end of the base rail 34, and the engagement with the support shaft 15 of the canopy opening/closing lever 17 is released. be.

In this state, when the opening operation switch (not shown) is pressed to drive the forward/reverse rotation motor 23, the sliding ladder 30 starts sliding by the traction wire 49 pulled thereby.

At the beginning of this sliding, when the locking shaft 58 reaches the guide slope 13b from the horizontal support surface 13a of the lock receiving fitting 13, the latch fitting 52 of the following means B engages with the support shaft 15 of the canopy opening/closing lever 17. (The state shown by the solid line in Figure 9)
At the same time, the opening of the canopy 5 is started with the rotation center axis A as the rotation center.

The opening of the canopy 5 and the sliding extension of the sliding ladder 30 are performed in parallel (see FIG. 10), and as the sliding ladder 30 slides in the extension direction, the sliding ladder 30 is extended. The undulation operation pin 45 protruding from the inner surface of the handrail frame comes into contact with the 5 arms 40 of the undulation tread 39 provided between the sliding base frame 32 of the fixed ladder 29, and together with the movement of the center of gravity of the undulation tread 39. This causes the undulating step board 39 to rise (see FIG. 7).

At this stage, the canopy 5, which is about to be rotated by the canopy opening rotation force due to its own weight, which is larger than the canopy closing rotation force by the gas spring 8, which is always acting, is moved by the canopy opening/closing lever 17 that follows the sliding movement of the sliding ladder 30. The canopy is supported by the canopy suspension force of the refraction link 10 in which the refraction state is restricted.

Therefore, as the sliding ladder 30 slides and expands, the bent part of the bending link 10 extends, and with this bent part straight, the canopy 5 is opened to the maximum opening angle (see FIG. 11).

Immediately before the canopy 5 is opened to the maximum opening angle, the release pin 57 protruding from the outside of the sliding base frame 32 releases the following means B.
comes into contact with the cam plate 54 of.

Due to this contact, the latch 52 rotates, the hook 51 of the latch 52 is removed from the spindle 15 of the canopy opening/closing lever 17, and the sliding ladder 30 continues to slide to a predetermined position.
When the limit switch for stopping extension and sliding (not shown) is activated, the opening operation switch is turned off, the forward and reverse rotation motor 23 is stopped, and the sliding of the sliding ladder 30 is stopped.

Thereafter, by raising and extending the folding ladder 31 connected to the extension side end of the sliding ladder 30 and extending it, the fixed tread 28b of the folding ladder 31 and the fixed tread 28a of the sliding ladder 30 are
The installation of the ladder is completed when the undulating treads 39 of the fixed ladder 29 are aligned in a straight line parallel to the slope line of the canopy 5 in the open state (see FIG. 12).

When the installed ladder is to be stored, the ladder is moved in the opposite direction to the above-mentioned arrangement and installation.

That is, first, after folding the folding ladder 31 onto the sliding ladder 30,
When the storage operation switch (not shown) is operated to reversely drive the forward/reverse rotation motor 23, the sliding ladder 30 is pulled in the shortening direction by the pulling wire 49, and this moves into the fixed ladder 2.
9 and rise.

In this sliding upward process, the cam plate 54 of the follower B comes into contact with the release pin 57, and at the same time, the guide slope 51a at the tip of the latch A52 comes into contact with the support shaft 15 of the canopy opening/closing lever 17.

In this case, since the cam plate 54 rotates independently against the spring 55, the sliding ladder 30 rises regardless of the presence of the release pin 57, and the hook 51 of the latch 52 is connected to the canopy opening/closing lever 17. It comes to engage with the support shaft 15.

Then, as the hook 51 of the latch 52 engages with the spindle 15 of the canopy opening/closing lever 17, the spindle 15 of the canopy opening/closing lever 17 follows the sliding movement of the sliding ladder 30, and is in a straight state. The bending portion of the bending link 10 located at Become.

Thereafter, due to the rotation of the canopy 5 in the closing direction and the sliding of the sliding ladder 30 in the shortening direction, when the locking shaft 58 reaches from the horizontal support surface 13a of the lock receiving fitting 13 to the guide slope 13b, the following means B The guide slope 51a of the latch fitting 52 rides on the release fitting 56, and the engagement between the latch fitting 52 and the support shaft 15 of the canopy opening/closing lever 17 is released.

Then, when the sliding ladder 30 roughly slides in the shortening direction and the locking shaft 58 reaches the horizontal support surface 13b of the lock receiver 13, a shortening sliding stop limit switch (not shown) is activated. Then, the closing operation switch is turned off, the forward and reverse rotation motor 23 is stopped, the sliding assembly 4 is stored in the ladder storage frame 3, and the lower opening of the ladder storage frame 3 is closed by the canopy 5. is completed.

In the above embodiment, the electric traction means includes a forward/reverse rotation motor 23 and the traction drum 2 driven by the motor 23.
5 and a pulling wire 49, but the invention is not limited to this, and it is possible to slide a part of a flexible member of a winding electric means such as a gear and a toothed belt, a pulley and a V-belt, a sprocket and a chain, etc. It may also be configured to be fixed to a part of the moving ladder.

Moreover, a tension spring can also be used as the closing rotation force applying means.

Furthermore, the undulating treads 39 are not individually undulating,
The sliding ladder 30 may be actuated at the end position of sliding in the extension direction, and raised and lowered in conjunction.

Furthermore, the locking device using the locking shaft 58 and the lock receiving fitting 13 may be configured such that a lock pin that protrudes and retracts is engaged with a lock hole by using a spring and electromagnetic force.

Further, as shown by the two-dot chain line in FIG. 12, support legs 65 that can be freely folded are pivotally attached to the folding ladder 31, and are connected to the folding ladder 31F so as to support the load due to the body weight. In some cases, the parts connected by the metal fittings 60, 61 and the connecting pin 63 are prevented from being damaged.

(Effects of the Invention) According to the ceiling ladder device according to the present invention described above, a closing rotational force in the direction of closing the canopy is always applied to the canopy, which can be opened and closed about the single rotation central axis as a fulcrum. At the same time, a sliding ladder with folding ladders connected thereto is slid on a fixed ladder, the sliding ladder is towed and slid by an electric traction means, and the canopy to which the ladder assembly is fixed is opened and closed. Since it is controlled by an electric traction means and the ladder assembly is extended at the same time as the opening and closing of the canopy, the ladder device can be opened and closed safely and smoothly in a short time using a small drive motor with extremely low capacity. At the same time, installation and storage of the ceiling ladder can be achieved by simple operations such as operating the opening/closing operation switch and folding the folding ladder.

For this reason, when the canopy opens to its maximum opening angle, unlike in the past, it opens forcefully, causing inconveniences such as damaging the center of rotation of the canopy and potentially colliding with the operator. Moreover, even when storing a ladder, the drawback that the canopy collides with the ceiling with force is eliminated.

In addition, since the folding ladder can be extended and folded at a lower position, the work efficiency is significantly improved.
Furthermore, since a folding ladder that can be manually folded is connected to the extension direction end of the sliding ladder, sliding of the ladder is performed at a certain height or higher out of the reach of young children. To safely arrange and store a ladder without the risk of hands being caught in sliding parts or between the extending ladder and the floor.

Furthermore, the fixed ladder is equipped with an undulating tread that can be raised and lowered, so that the fixed tread of the folding ladder and the fixed tread of the sliding ladder are in a straight line parallel to the fixed ladder, so there is no difference in steps and it is possible to go up and down safely. However, it can be used as a ceiling ladder device.

[Brief Description of the Drawings] Fig. 1 is a schematic diagram showing an exploded state of a ceiling ladder device according to an embodiment of the present invention, and Fig. 2 is a planar exploded view of a ladder storage frame with the ladder assembly and canopy portion omitted. Figure 3 is a schematic plan view of the canopy part, Figure 4 is a side view from the rotation center side when the ladder assembly is fixed to the canopy, and Figure 5 shows the state in which the traction wire is connected. Figure 6 is a partial view showing the sliding configuration of the sliding ladder and the following configuration of the lever for opening and closing the canopy, Figure 7 is a partial cross-sectional view showing the configuration of the undulating tread, and Figure 8 is the direction of the arrow in Figure 7. FIGS. 9 to 11 are partial side views of FIGS. 9 to 11, which are diagrams showing changing states of the canopy and ladder assembly, showing the opening/closing and extending/contracting states. A...Rotation center axis B...Following means l...
...End plate 2...Side Plate 3...Ladder storage frame 4...Ladder assembly lO...Refraction link 11...Upper arm 14...Lower arm
16... Engagement roller 17... Lever for opening/closing the canopy 19... Support fitting 20... Lower arm pivot fitting A 23... Forward/reverse rotation motor 25... Traction Drum 29...Fixed ladders 28a, 28b...
Fixed tread 30...Sliding ladder 3■...Folding ladder 3
2... Sliding base frame 34... Foundation rail 36
...Sliding rail 38 ...Slide cover 3
9... Elevation step board 45... Elevation operation pin 46... Trochanter for traction wire

Claims (1)

[Scope of Claims] 1. A ladder storage frame 3 having a rectangular planar shape with an open upper and lower surface formed by a pair of opposing end plates 1, 1 and side plates 2, 2, and this ladder storage frame 3. A folding ladder which is housed in a ladder and has a fixed tread 28b stepped at one end of a sliding ladder 30 which extends and contracts by sliding on the fixed ladder 29. 31 are foldably connected, and the fixed ladder 29 has the fixed treads 28a, 28 that stand up when the sliding ladder 30 slides and extends.
A ladder assembly 4 is provided with an undulating tread 39 that can be raised and lowered so that the tread is stepped on the extension of the step b, and a fixed ladder 29 of this ladder assembly 4 is fixed, and the sliding ladder 30 is It comprises a canopy 5 that is equipped with an electric traction means that can be pulled in the sliding direction and closes the opening surface on the lower surface of the ladder storage frame 3, and this canopy 5 is placed on the opposite side of the extension direction of the ladder assembly 4. It is pivotally attached to the inner surfaces of both side plates of the ladder storage frame 3 so as to be able to open and close freely so as to rotate about a horizontal pivot axis A provided therein, and in a direction that always closes the canopy 5 around the pivot portion. The device is provided with a closing rotational force applying means for applying a rotational force of 1, and is capable of bending both sides of the open/close free end side of the canopy 5 and the corresponding inner surfaces of both side plates of the ladder storage frame 3. They are connected by a bending link 10 that regulates the opening angle, and the end of the fixed ladder 29 near the center of rotation of the canopy 5 and the bending part of the bending link 10 are connected by a lever 17 for opening and closing the canopy so as to be bendable. The connecting portion between the canopy opening/closing lever 17 and the fixed ladder 29 is a following means that moves in the sliding direction following the sliding of the sliding ladder 30 and is released from following at a predetermined opening angle of the canopy 5. A ceiling ladder device, characterized in that it is engaged by B. 2. The electric traction means includes a traction wire 4 wound around a traction drum 25 driven by a forward and reverse rotation motor 23.
9 is wrapped around the traction wire trochanter 46 attached to both ends of the inner surface of the sliding base frame 32, and fixed to a wire fixing pin 47a protruding from the inner surface of one end of the handrail frame 35 of the sliding ladder 30. The ceiling ladder device according to claim 1, wherein the other end of the pulling wire 49 is fixed to a wire fixing pin 47b protruding adjacent to the wire fixing pin 47a.