JPH0554558B2 - - Google Patents

Description

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

(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, and one end that opens and closes the opening 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. Consists of an assembly,
When the canopy starts to be opened, the canopy closing rotational force applied by the tension spring is greater than the canopy opening rotational force due to the weight of the canopy and ladder assembly, and the canopy closes on both sides of the free end of the canopy. After the two rotational forces are balanced during the opening process, the ladder storage frame is suspended by a suspension means in which the rotational force for opening the canopy is greater than the rotational force for closing the canopy, and the canopy is lifted with a relatively small operating force. can be opened and closed.

(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, it is possible to open the canopy to the balanced opening angle by applying a slight pulling force when opening the canopy. However, from the equilibrium position to the maximum opening angle,
The ladder may open forcefully due to the rotational force and inertia of the canopy, causing inconveniences such as damaging the center of rotation of the canopy or colliding with the operator. , it becomes necessary to apply a large upward force to return from the maximum opening 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 when storing the canopy, a large pulling force must be applied. The drawback is that the canopy hits the ceiling with force.

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

(Means for solving the problem) A ceiling ladder device for achieving the above purpose is:
A ladder storage frame body having a rectangular planar shape with an open upper and lower surface formed by a pair of opposing end plates and side plates, and a ladder storage frame body that is housed within the ladder storage frame body, and a fixed treadle is provided in steps, and A folding ladder with a fixed tread step is attached to one end of the sliding ladder, which expands and contracts by sliding on the fixed ladder. A ladder assembly is provided with an undulating tread that can be raised and lowered so that it stands up during dynamic extension and the tread is stepped on an extension of the step of the fixed tread, and a fixed ladder of this ladder assembly is fixed, and the sliding ladder a canopy that is equipped with an electric traction means that can pull the ladder assembly in the sliding direction and that closes the opening surface of the lower surface of the ladder storage frame, and the canopy is connected to a horizontal The ladder storage frame is pivotally connected to the inner surfaces of both side plates of the ladder storage frame so as to be able to open and close freely, and a rotational force is always applied around the pivot in the direction of closing the canopy. A closing rotation force applying means is provided, and both sides of the open/close free end side of the canopy and the corresponding inner surfaces of both side plates of the ladder storage frame are connected by a bending link that is bendable and regulates the opening angle of the canopy. At the same time, the end of the fixed ladder near the center of rotation of the canopy and the bending part of the bending link are bendably connected by a lever for opening and closing the canopy, and the connecting part between the lever for opening and closing the canopy and the fixed ladder is formed by a slider. It is characterized in that it moves in the sliding direction following the sliding motion of the movable ladder, and is engaged so that the following is released at a predetermined opening angle of the canopy.

(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. The canopy opening/closing lever engages the fixed ladder and follows the sliding movement of the sliding ladder at the same time as it slides on the top in the extension direction.
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 treads are sequentially erected, and the canopy is opened by overcoming the rotational force in the direction of closing the canopy by the closing rotational force applying means.

When the canopy is opened until the opening angle is restrained by the bending link, the canopy opening/closing lever stops following, and after that, only the sliding ladder slides in the extension direction and extends to a predetermined position. At this point, the electric traction means stops driving. 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, after folding the folding ladder and stacking it on the sliding ladder, when the electric traction means is operated, a traction force opposite to that described above acts on the sliding ladder, causing the sliding ladder to slide in the direction of shortening, The erected undulation treads are successively laid down, and at the time when they are shortened to a predetermined position, the canopy opening/closing lever follows the movement of the sliding ladder in the shortening direction.

By following this movement of the canopy opening/closing lever in the shortening direction, the bent portion of the bending link is pulled. As a result, a canopy closing rotation force using the rotation center as a fulcrum comes to work, and the canopy is closed and fixed to the canopy in conjunction with the closure rotation force that is always acting by the closure rotation force applying means. The ladder assembly comes to be stored in the ladder storage frame.

(Example) An example of a 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, and the ladder storage frame 3
It consists of a canopy 5 which opens and closes by rotating an opening on the lower surface of the canopy around a horizontal central axis of rotation at one end.

The ladder storage frame 3 has a rectangular planar shape formed by a pair of opposing end plates 1, 1 and side plates 2, 2, and has an open upper and lower surface, and has an opening below one end of the side plates 2, 2. Rotation center receiving hole 6
At the same time, a closing edge 7 for preventing upward rotation of the canopy 5 is protruded from the inner edge of the opening on the lower surface, and a closing rotation force applying means is provided on the inner surface near the other end of the side plates 2, 2. a spring support bracket 9 that pivots and supports the other end of the gas spring 8; an upper arm pivot fitting 12 that pivots the end of the upper arm 11 of the bending link 10; and a pivoting end of the ladder assembly 4. A lock receiving fitting 13 is fixed thereto.

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

Further, as shown in FIGS. 1 and 2, the bending link 10 has an upper arm 11 and a lower arm 14 connected to a pin 10a.
Below this bent portion, the other end of a canopy opening/closing lever 17 having an engaging roller 16 supported by a support shaft 15 at one end is connected by a pin 10b.

As shown in FIGS. 1, 3, and 4, the canopy 5 is sized to close the lower opening of the ladder storage frame 3, and has a rotation center receiving hole 6 in the side plates 2, 2.
A support fitting 19 having a rotation center hole 18 formed therein and above which one end of the gas spring 8 is pivotally attached is fixed at one end position corresponding to the rotation center hole 18;
By being pivotally connected to the rotation center hole 18 and the rotation center receiving hole 6 through the rotation center axis A, it can be opened and closed with respect to the ladder storage frame 3.

Lower arm pivot fittings 20 for pivotally attaching the lower arm 14 of the bending link 10 are fixed to both sides of the free opening/closing end of the canopy 5, and uppermost fixed step plates 21 are fixed to both sides of the rotation center side. The treadle erection arm 22 which erected and supported the
However, a forward/reverse rotating motor 23, which is a driving source for the electric traction means, is fixed between the footboard installation arms 22, 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 threaded rod 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.

Furthermore, as shown in FIG.
A horizontal traction shaft 24 is installed on the traction shaft 24, and a traction drum 25 is attached to both ends of the traction shaft 24. There is.

As shown in FIGS. 1, 3, and 6 to 8, the ladder assembly 4 has fixed treads 28a arranged in steps,
In addition, a folding ladder 31 having a stepped fixed tread 28b is foldably connected to one end of a sliding ladder 30 which is adapted to extend and contract by sliding on the fixed ladder 29,
A fixing metal fitting 33 is fixed to a sliding base frame 32 constituting the fixed ladder 29, and is fixed to the canopy 5 so that the extending direction is in the direction of the open/close free end of the canopy 5.

The sliding ladder 30 and the folding ladder 31 are the first
As shown in the figure, the connecting metal fittings 60 and 61 fixed to each end are connected to each other by a connecting pin 62, and the connecting metal fitting 60 is connected to a hanging pin 63 that protrudes from the connecting metal fitting 61. A pivotably mounted latch 64 is applied to maintain the straight state.

The sliding structure between the fixed ladder 29 and the sliding ladder 30 is such that the fixed ladder 29 is fixed along the upper edge of the outer surface of the sliding base frame 32 on both sides of the fixed ladder 29, as shown in FIGS. A foundation rail 34 with a C-shaped cross section and a sliding rail 36 with a C-shaped cross section limited along the lower edge of the handrail frame 35 of the sliding ladder 30 are installed on each rail 34,
Slide roller 37 rolling in the C-shaped groove of 36
It is designed to be gripped by a slide cover 38 having a diameter.

In addition, as shown in Figures 7 and 8, the fixed ladder 2
A sliding ladder 30 is installed between the sliding base frames 32 and 32 of 9.
A undulating tread plate 39 is provided which can be raised and lowered so that it stands up when the fixed tread plate 28a is slid and extended, and the tread plate is stepped on the stepped extension of the fixed tread plate 28a.

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 support arm 40 and a support arm 41, and the rotation support arm 42 supports the support arm 40 when lying down.
A support bracket 43 is fixed to the inner surface of the sliding base frame 32 such that it protrudes from the upper edge of the sliding base frame 32.
It is pivoted to the pin 44.

The sliding ladder 3 slides on the sliding base frame 32.
On the inner surface of the handrail frame 35, a raising/lowering operation pin 45 which comes into contact with the abutment arm 40 of the rotating support arm 42 during sliding 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 foundation frame 32 (see FIGS. 6 and 7).
A pin fixing fitting 48 with wire fixing pins 47a and 47b protruding from the inner surface of one end of the handrail frame 35 of the sliding ladder 30 is fixed, and as shown in FIG. The traction wire 49 wound around the traction drum 25 has one end wrapped around the traction wire trochanter 46 and fixed to the wire stop pin 47b, and the other end fixed to the wire stop pin 47a. It is being

Further, on the outer side of one end of the sliding ladder 30, as 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 has a guide slope 51a at the tip end of a supporting metal fitting 50 fixed to the outside of the handrail frame 35.
a latch 52 formed with a hook 51 having a hook 51;
A hook 53 for swinging the hook 52 and a cam plate 54 forming an abutting end 54a are coaxially connected, and a cam is used to maintain the abutting end 54a of the cam plate 54 at a lower pivot position. The rear end of the plate 54 and the support fitting 5
0 is connected to the base rail 3 by a spring 55, and the hook 51 of the latch 52 is connected to the base rail 3.
4 and one end of a lever 17 for opening and closing the canopy. And, at one end of the foundation rail 34,
When the sliding ladder 30 is shortened, the guide slope 51a of the latch 52 rides on the hook 51 from the support shaft 15.
A release fitting 56 configured to release the hook is fixed 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 when the canopy 5 is at the maximum open position. A release pin 57 is provided to protrude from the contact end 54a of the cam plate 54.

Note that a locking shaft 58 horizontally protrudes from the outer surface of the handrail frame 35 of the sliding ladder 30 in FIGS. 1 and 6.
is provided so as to lie beside the guide slope 13a of the lock receiving fitting 13 when the ladder assembly 4 is accommodated in the ladder storage frame 3.

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 By being pivotally connected through the shaft A, it can be opened and closed.

The other end of the gas spring 8 is pivotally supported on the inner surfaces of the side plates 2, 2, and the other end of the gas spring 8 always applies a rotation force in the direction of closing the canopy 5 with the rotation center axis A as the rotation center. The other end is pivotally attached to a support fitting 19 fixed to the canopy 5 to support the rotation center axis A.

In addition, the free end of the upper arm 11 of the bending link 10, which connects the upper arm 11 and the lower arm 14 with a pin 10a in a freely bendable manner, is pivotally attached to the inner surfaces of the side plates 2, 2.
The free end of the lower arm 14 of the bending link 10 is connected to the canopy 5
Lower arm pivot fittings 20 fixed on both sides of the opening/closing free end side of
The engaging roller 16 at the free end of the canopy opening/closing lever 17, which is pivoted to and below the bent portion of the bending link 10, is fixed to the fixed ladder 29 of the ladder assembly 4. is engaged within.

Furthermore, a forward/reverse rotation motor 2 fixed to the canopy 5
Both ends of the traction wire 49 wound around the traction drum 25 driven by Fixed.

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

First, FIG. 9 shows a state in which the ladder assembly 4 fixed to the canopy 5 is stored and locked within the ladder storage frame 3 (the position indicated by the 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. Although the canopy closing rotational force is acting, the lock shaft 58 protruding from the outside of the sliding ladder 30 of the ladder assembly 4 is connected to the lock receiving metal fitting provided on the inner surface of the side plates 2, 2 of the ladder storage frame 3. is engaged and supported on the horizontal support surface 13a of 13,
The storage condition is maintained stably.

At this time, the engaging roller 16 supported via the support shaft 15 on the canopy opening/closing lever 17 which is pivotally connected to the bent part of the bending link 10 bent in two is moved by the sliding movement of the fixed ladder 29. The latch 52 of the follower B installed on the sliding ladder 30 is engaged with the end of the base rail 34 fixed to the base frame 32 on the rotation center side.
The canopy opening/closing lever 17 is in a state where it is disengaged from the support shaft 15 by being pushed up by a release fitting 56 fixed to the starting end of the canopy.

In this state, if the opening operation switch (not shown) is pressed to drive the forward and reverse rotation motor 23,
The sliding ladder 30 starts sliding by the pulling wire 49 pulled by this.

At the beginning of this sliding, when the locking shaft 58 reaches the guide inclined surface 13b from the horizontal support surface 13a of the lock receiving fitting 13, the latch fitting 5 of the following means B
2 engages with the support shaft 15 of the canopy opening/closing lever 17 (the state shown by the solid line in FIG. 9), and at the same time, the opening of the canopy 5 starts about the rotation center axis A.
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. Raising operation pin 45 protruding from the inside of the handrail frame
is in contact with the arm 40 of the undulating tread 39 provided between the sliding base frame 32 of the fixed ladder 29, and the undulating tread 39
Together with the movement of the center of gravity, the undulating treadle 39 becomes erect (see Fig. 7).

At this stage, the gas spring 8 is always in action.
The canopy 5 attempts to rotate due to the canopy opening rotation force due to its own weight which is greater than the canopy closing rotation force due to
The bending link 1 whose bending state is restricted by the canopy opening/closing lever 17 that follows the sliding movement of the sliding ladder 30
The canopy is now supported by the canopy suspension force of 0.

Therefore, as the sliding ladder 30 slides and expands, the bending part of the bending link 10 extends, and in a state where the bending part becomes 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, a release pin 57 protruding from the outside of the sliding base frame 32
comes into contact with the cam plate 54 of the following means B.

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, and the extension slide When the limit switch (not shown) for stopping the movement is activated, the opening operation switch is turned off, the forward/reverse rotating motor 23 is stopped, and the sliding ladder 30 is stopped.

Thereafter, by raising and extending the folding ladder 31 that is 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 fixed. The installation of the ladder is completed when the undulating tread 39 of the ladder 29 is 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 is moved by the traction wire 49. 30 is pulled in the shortening direction, and this slides along the fixed ladder 29 and rises.

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 52 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. Support shaft 15
becomes engaged with.

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. The bent portion of the bending link 10 in the straight state is gradually bent, and a turning force in the closing direction acts on the canopy 5, and the sliding of the sliding ladder 30 in the shortening direction and the rotation of the canopy 5 in the closing direction proceed simultaneously. It becomes like this.

After that, the canopy 5 is rotated in the closing direction and the sliding ladder 30 is
Due to the sliding in the shortening direction, the locking shaft 58 moves from the horizontal support surface 13a of the lock receiving fitting 13 to the guide inclined surface 1.
3b, the latch 5 of the following means B
The second guide slope 51a rides on the release metal fitting 56, and the engagement between the latch metal fitting 52 and the support shaft 15 of the canopy opening/closing lever 17 is released.

When the sliding ladder 30 further 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. , the closing operation switch is turned off, the forward/reverse rotation motor 23 is stopped, and the storage of the sliding assembly 4 into the ladder storage frame 3 and the closing of the lower opening of the ladder storage frame 3 by the canopy 5 are completed. do.

In the above embodiment, the forward/reverse rotation motor 23, the traction drum 25 driven by the motor, and the traction wire 49 were used as the electric traction means, but the invention is not limited to this, and gears and teeth may be used. It may be constructed such that a part of the flexible member of the winding electric means, such as a belt, a V-pulley and a V-belt, a sprocket and a chain, is fixed to a part of the sliding ladder.

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

Further, the undulating step plates 39 may not be individually undulated, but may be activated at the end position of the slide in the extension direction of the sliding ladder 30, and undulated in conjunction with each other.

Furthermore, the lock shaft 58 and the lock receiving fitting 1
The locking device according to No. 3 may be configured such that a locking pin that protrudes and retracts is engaged with a locking hole by using a spring and electromagnetic force.

Further, as shown by the two-dot chain line in FIG. 12, telescopically adjustable support legs 65 are foldably pivotally attached to the folding ladder 31, and are linked so as to support the load of the body weight on the folding ladder 31. Fittings 60, 61 and connecting pin 6
In some cases, it is possible to prevent damage to the connected parts due to 3.

(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 rotation center axis as a fulcrum. At the same time, a sliding ladder provided with folding ladders is slid on a fixed ladder, and this sliding ladder is pulled and slid by an electric traction means, and
The opening and closing of the canopy to which the ladder assembly is fixed is controlled by electric traction means, and the extension of the ladder assembly is performed at the same time as the opening and closing of the canopy. The ladder device can be opened and closed safely and smoothly, and the ceiling ladder can be placed and stored by simple operations such as operating the opening/closing operation switch and folding the 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 disadvantage of the canopy colliding with the ceiling with force is eliminated.

In addition, since the extension and folding work of the folding ladder can be performed at a low position, the work efficiency is significantly improved.Furthermore, a folding ladder that can be folded manually is connected to the extension direction end of the sliding ladder. Since we have set up
The sliding of the ladder is carried out at a certain height or higher out of the reach of children, so there is no risk of children's hands being caught in the sliding part or between the extending ladder and the floor. Ladders can be placed and stored safely.

Furthermore, the fixed ladder is equipped with undulating treads that can be raised and lowered freely.
The fixed treads of the folding ladder, the fixed treads of the sliding ladder, and the undulating treads of the fixed ladder are arranged in a straight line parallel to the slope line when the canopy is in the open state, so no difference in steps is formed and it is possible to ascend and descend safely. However, it can be used as a ceiling ladder device.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an exploded state of a ceiling ladder device according to an embodiment of the present invention, Fig. 2 is an exploded plan view of a ladder storage frame with the ladder assembly and canopy portion omitted, and Fig. 3 is a plan view of the canopy. A schematic plan view of the parts, Figure 4 is a side view from the rotation center side when the ladder assembly is fixed to the canopy, Figure 5 is an explanatory diagram showing the state in which the traction wire is engaged, and Figure 6 is the sliding FIG. 7 is a partial cross-sectional view showing the configuration of the undulating step board; FIG. 8 is a partial side view taken from the direction of the arrow in FIG. 7; 1 to 12 are changing state diagrams showing the opening/closing and extending/contracting states of the canopy and ladder assembly, and FIG. 12 is a diagram showing the extended state of the ladder device. A...Rotation center axis, B...Following means, 1...End plate, 2...Side plate, 3...Ladder storage frame, 4...Ladder assembly, 5...Canopy, 8...Gas spring ,1
0... Refraction link, 11... Upper arm, 14... Lower arm, 16... Engagement roller, 17... Canopy opening/closing lever, 19... Supporting metal fitting, 20... Lower arm pivoting metal fitting, 23... Forward/reverse rotation motor, 25... Traction drum, 29... Fixed ladder, 28a, 28b... Fixed tread, 30... Sliding ladder, 31... Folding ladder, 3
2...Sliding base frame, 34...Foundation rail, 36...
Sliding rail, 38...Slide cover, 39...
...Luffing step board, 45...Luffing operation pin, 46...
Trochanter for traction wire, 47...Wire retaining pin, 4
9... Traction wire, 52... Latch fitting, 54...
...Cam plate, 56...Release fitting, 57...Release pin.

Claims (1)

[Scope of Claims] 1. A ladder storage frame 3 which has a rectangular planar shape with a pair of opposing end plates 1, 1 and side plates 2, 2 and has open upper and lower surfaces, and the inside of this ladder storage frame 3. A sliding ladder 30, which is housed in a sliding ladder 30, has a fixed tread 28a stepped thereon, and is adapted to extend and contract by sliding on the fixed ladder 29.
A folding ladder 31 with tiers is arranged in a row so as to be freely foldable,
The fixed ladder 29 has the respective fixed treads 28 that stand up when the sliding ladder 30 slides and extends.
Ladder assembly 4 provided with an undulating tread 39 that can be raised freely so that the tread is stepped on the extension of steps a and 28b
The fixed ladder 29 of this ladder assembly 4 is fixed,
Further, an electric traction means capable of pulling the sliding ladder 30 in the sliding direction is provided, and the ladder storage frame 3
A canopy 5 that closes the opening surface on the lower surface of the ladder assembly 4. A closing turning force imparting means is pivotally attached to the inner surfaces of both side plates of the frame body 3 so as to be freely openable and closable, and is provided around the pivoting portion with a closing turning force applying means that always applies a turning force in the direction of closing the canopy 5. Both sides of the free end side and the corresponding inner surfaces of both sides of the ladder storage frame 3 are connected by a bending link 10 that is bendable and regulates the opening angle of the canopy 5. The end of the fixed ladder 29 and the bending part of the bending link 10 are connected to the canopy opening/closing lever 1.
7, the canopy opening/closing lever 17
The connecting portion between the fixed ladder 29 and the fixed ladder 29 moves in the sliding direction following the sliding of the sliding ladder 30, and the canopy 5
1. A ceiling ladder device, characterized in that the ladder device is engaged by a follow-up means B which releases the follow-up at a predetermined opening angle. 2 The electric traction means connects one end of the traction wire 49 wound around the traction drum 25 driven by the forward/reverse rotation motor 23 to the traction wire trochanter 46 attached to both ends of the inner surface of the sliding base frame 32. The wire is 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, and the other end of the traction wire 49 is protruding adjacent to the wire fixing pin 47a. wire retaining pin 4
7b. The ceiling ladder device according to claim 1, which is configured to be fixed to the ceiling ladder device 7b.