JPH08296384A - Ladder device for ceiling - Google Patents

Abstract

PURPOSE: To attain smooth release by a method wherein a belt is wound, a cover is lifted and locking is released so that the weight of the cover is not applied to a locking mechanism before the belt is delivered from a winding means and the cover is opened when a ladder is housed and the cover pivotally attached into the opening section of a ceiling is opened. CONSTITUTION: When a lowering switch is turned on, a belt winder 37 is rotated reversely by a fixed quantity, a belt 33 is wound by a winding pulley 35, and a cover 10 is revolved in the closing direction. The front end of the cover 10 is lifted, and a clearance is generated between the lower end section of a latch bolt under the projected state in a lock device 66 and the lower end face of a latch receiver on the frame body 5 side. A solenoid for the lock 66 is energized, the latch bolt is sunk, and the cover 10 can be rotated in the opening direction. The winder 37 is forward rotated, the belt 33 is delivered from the pulley 35, and the cover 10 is opened centering around a hinge 11. Accordingly, even when the latch bolt is brought into press-contact with the latch receiver by the looseness of the belt and the weight of the cover, the latch bolt can be removed from the latch receiver with no resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric ceiling ladder device, and more particularly to a device for smoothing the opening operation of its lid.

[0002]

2. Description of the Related Art Conventionally, as this type of ladder device, a device disclosed in Japanese Patent Application Laid-Open No. 5-141166 has been known. This one includes a lid that opens and closes the ceiling opening, and a folding ladder whose upper end is rotatably connected to the peripheral edge of the ceiling opening and which is folded in two into each upper and lower ladder.
The middle part of the lower ladder part of the ladder and the lid are connected by a connecting rod, and the tip part of the belt (string-like object) is connected to the intermediate part of this connecting rod, and the base end side of this belt is placed in the ceiling opening. By winding or unwinding, the connecting rod is pulled up or pulled down by the belt so that the opening / closing operation of the lid and the expansion / contraction operation of the ladder can be continuously performed.

In the ladder device in which the lid of the ceiling opening is opened and closed to extend and contract the ladder, as described above,
A lock mechanism is provided to lock the lid in the closed state. This locking mechanism is provided with an engaging portion on one of the peripheral edge of the ceiling opening and the lid, and a locking portion capable of engaging with the above-mentioned engaging portion on the other, and locks the locking mechanism when closing the lid. The lid is locked by being engaged with the engaging portion.

[0004]

However, since a rotating member such as a ladder or a connecting rod is attached to the lid, the weight including them is large, and the lid is installed at the periphery of the ceiling opening with high accuracy. Even if it is installed by raising it, it is inevitable that the lid hangs down or tilts to some extent during long-term use. This is also assisted by loosening of the belt and the like. Further, in the closed state, the weight of the lid portion is supported by the engaging surface of the engaging portion of the lock mechanism and the engaging portion that engages with it, so that the lid is deformed such as hanging or tilting. And the contact resistance between the engaging part and the locking part of the lock mechanism becomes large, and when the lock mechanism is unlocked by an electric force such as a solenoid when the lid is opened, the unlocking force by the electricity is insufficient. Then, there is a problem in that the lock mechanism cannot be released satisfactorily, and there is room for improvement.

The present invention has been made in view of the above circumstances, and an object thereof is to change the winding and unwinding operations of the belt member when the lid is opened, thereby causing the lid to be deformed such as hanging or tilting, or the belt. Even if the member is loosened, the locking device in the closed state is surely unlocked so that the lid can be opened, and the operation of opening the lid in the ceiling ladder device can be performed smoothly. .

[0006]

In order to achieve the above object, according to the present invention, when the lid is rotated at the base end portion by the winding and unwinding operation of the belt member by the belt winding means, the lid is closed. When opening the lid from the lid state, prior to the operation of unwinding the belt member from the winding means and opening the lid, the belt member is reversely wound around the winding means in advance and the lid is lifted,
In this lifting state, the weight of the lid part is not applied to the lock mechanism, and the lock is released.

[0007] Specifically, in the invention of claim 1, a frame body arranged around the ceiling opening portion of the room and fixedly attached, and a base end rotatably attached to the frame body, the ceiling opening portion. It consists of a lid that opens and closes, and a number of ladders that are retractably connected to each other.When it is in use, it stretches over the ceiling opening and the floor, while when not in use, it contracts. A belt member provided with a ladder housed in a ceiling opening, a belt member having a tip connected to a lid, and a belt winding means capable of winding and unwinding the base end side of the belt member. The subject is a ceiling ladder device in which at least the lid is opened and closed by the winding and unwinding operations of.

Further, there is provided an engaging portion provided on one of the frame body and the lid, and an engaging portion provided on the other of the frame body and the lid and capable of engaging with the engaging portion, and the lid is closed. Locking means for locking the lid to the closed state by engaging the locking portion with the engaging portion at times,
When the locking of the lid to the closed state by the locking means is released, a control for controlling the belt winding means such that the belt member is wound up and the tip end portion of the lid is lifted and held by a predetermined amount prior to the release. And means.

According to a second aspect of the present invention, the ladder is a folding ladder in which adjacent ladder portions are rotatably connected by a hinge, and the ladder portions are folded when contracted.

According to the third aspect of the present invention, in the ladder, one of the adjacent ladder portions is slidably connected to the other, and the ladder portion is configured to slide and contract when contracted. To do.

[0011]

With the above construction, in the invention of claim 1, at least the lid is basically opened and closed by winding or unwinding the belt member by the belt winding means. That is, at the time of use, when the lid in the closed state is opened and the ladder is taken out from the ceiling opening, the belt member is unwound from the belt take-up means, the length of the belt member is extended by the unwinding of the belt member, and the tip end hangs down. As described above, the lid pivots around the base end and opens. During or after the opening of the lid, the ladder portion in the contracted state of the ladder extends, the lower end of the ladder contacts the floor surface, and the ladder is bridged between the ceiling opening and the floor surface.

On the contrary, after use, the extended ladder is contracted and stored in the ceiling opening, and when the lid is closed, the extended ladder is contracted and the belt is wound on the belt winding means. The member is wound up, and its length is shortened by winding up the belt member, and the lid is rotated around the base end portion in the direction opposite to the direction when the lid is opened, and the lid is closed. To be closed. The ladder in the contracted state is housed in the ceiling opening portion before or during the closing operation of the lid.

In the closed state of the lid, the locking portion of the locking means is engaged with the engaging portion to lock and hold the lid in the closed position, and the locking means releases the lock to open the lid. However, prior to the unlocking of the lid to the closed state by the locking means, the control means controls the belt winding means to wind the belt member, and the winding of the belt member causes the tip portion of the lid to move by a predetermined amount. Lifted and held. In this lifted state, a predetermined gap is created in the contact portion between the locking portion and the engaging portion in the locking means,
The resistance between the two becomes smaller. Therefore, after this, when the locking means is released while the lid is being lifted to release the lock in the closed state, the locking portion is smoothly disengaged from the engaging portion without resistance due to the gap, and the belt member Even if the cover is loosened or the lid is drooped, the locking portion of the locking means can be easily and surely released from the engaging portion to unlock. After the lock is released, the belt member is paid out from the belt winding means and the lid is opened as described above.

According to the second aspect of the present invention, in the ceiling ladder device having the folding ladder, when the lid of the ceiling opening is unlocked from the closed state and opened, the same effect as above can be obtained.

According to the third aspect of the invention, in the ceiling ladder device having the slide type ladder, when the lid of the ceiling opening is unlocked and opened from the closed state, the same effect as above can be obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIGS. 4 to 6 show Embodiment 1 of the present invention.
Is a ceiling of a room, and a storage room 2 such as an attic is formed above the ceiling. A rectangular opening 3 is opened at a predetermined position of the ceiling 1, and a plurality of plate members 5a, 5a, ... Having a vertical width are assembled in a rectangular shape at the peripheral edge of the ceiling opening 3. A frame 5 having a predetermined height is attached and fixed. One end side (the right side in each drawing) of the frame body 5 in the length direction is a lid mounting side, and a lid 10 for opening and closing the ceiling opening 3 in the frame body 5 is provided at the lower end of the plate material 5a on the lid mounting side. Hinge 1 at its base
It is rotatably attached by 1. This lid 10
Is a closed position in which the ceiling opening 3 in the frame 5 is closed in a horizontal posture, and an inclined position in which the tip portion hangs down to form a predetermined angle θ with the ceiling 1 and an open position in which the ceiling opening 3 is opened. Rotate between and.

Further, the frame body 5 has a frame-shaped frame body extension portion 6 which is extended so that the plate material 5a on the lid mounting side which supports the base end portion of the lid 10 serves as a partition wall. The extension portion 6 is formed with a motor housing chamber 7 whose upper and lower open portions are closed.

A foldable ladder 13 is attached to the rear surface (surface on the side of the storage chamber 2) of the lid 10. This ladder 1
3 is a form in which one long ladder is divided into three parts in the longitudinal direction into an upper ladder portion 14, a middle ladder portion 15 and a lower ladder portion 16. One end of the upper ladder portion 14 has a base end side left and right on the rear surface of the lid 10. The left and right plate-shaped upper ladder mounting members 19, 19 (1) are mounted on the square members 18, 18 (only one is shown) mounted and fixed on both sides.
(Only one of which is shown), and the other end is a pair of left and right plate-shaped lower ladder attachment members 2 on the left and right sides on the front end side of the back surface of the lid 10.
0 and 20 (only one of which is shown) are attached and fixed respectively, and the upper ladder portion 14 is arranged in parallel with the back surface of the lid 10 with a predetermined space therebetween.

One end of the middle ladder 15 is rotatably connected to the other end of the upper ladder 14 via a pair of left and right hinges 22, 22 (only one is shown). Each of the hinges 22 has two pieces 2 as shown in the enlarged detail of FIG.
3, 24 are rotatably connected by a shaft 25, one piece 23 of which is at the end of the vertical frame 14a of the upper ladder portion 14, and the other piece 24 is of the vertical frame 15a of the middle ladder portion 15. It is attached and fixed to each end.

At the other end of the middle ladder portion 15, one end of the lower ladder portion 16 has a pair of left and right hinges 26 similar to the above.
It is rotatably connected via 26 (only one is shown). Then, when the ladder 13 is folded, as shown in FIG.
The upper ladder portion 14 parallel to the upper ladder portion has a middle ladder portion 15 adjacent to the upper ladder portion 14, and a lower ladder portion 16 adjacent to the middle ladder portion 15 on top of the upper ladder portion 14 and the lower ladder portions 16 overlap with each other in parallel with each other. It is stored in the ceiling opening portion 3 in a state of being folded into a substantially N-shape at 22 and 26.

Belt insertion holes 28 are formed through the upper and lower ends of the plate 5a on the lid mounting side of the frame 5, that is, the frame 5 above the base mounting portion of the lid 10.
Further, brackets 29, 29 are fixedly attached to both sides of the lid mounting side plate member 5a in the vicinity of the respective belt insertion holes 28, and guide pulleys 30, 30 are horizontally arranged at the same height position on both brackets 29, 29, respectively. It is attached so that it can rotate around the axis in the left-right direction. That is, these guide pulleys 30, 30 are arranged directly above the hinge 11 of the lid 10.

The other end of the upper ladder portion 14 is attached to the lid 1
Left and right pair of lower ladder mounting members 20 and 2 fixed to 0
At 0, a rod-shaped belt fixing member 31 extending in the left-right direction is inserted and fixed at a lower portion on the tip side of the lid so as to extend between the both ladder mounting members 20, 20. And this belt fixing member 3
End flat belts 33, 33 on both left and right ends
A tip portion (only one of which is shown) is formed into a loop and is inserted and locked. The intermediate portion of each belt 33 passes through a movable pulley 44 and a fixed pulley 40, which will be described later, and then the lid 10
And the upper ladder portion 14 and the lid 10 so that they are almost always parallel to
A space extending from the rear surface of the frame 10 to the base end side of the lid 10 is inserted into the belt insertion hole 28 of the plate member 5a of the frame body 5 while being stretched between the guide pulleys 30 on both sides thereof. .

Further, left and right belt winding pulleys 35, 35 (only one is shown) are arranged and accommodated in the motor accommodating chamber 7 of the frame 5 corresponding to the guide pulleys 30, 30, respectively. The two take-up pulleys 35, 35 are drivingly connected to one electric motor 36 capable of forward and reverse rotations via a speed reducing mechanism (not shown) such as a worm gear. The motor 36, the speed reduction mechanism, and the two take-up pulleys 35, 35 constitute a belt take-up device 37 that can take out and take up the belt 33 at the base end side. The two take-up pulleys 35, 35 are synchronously rotated to take-up or take-out each belt 33 at the base end side, and each belt 33 is taken up by the take-up pulley 35 by the reverse rotation of the motor 36, for example.
Belt fixing member 31 (tip of belt 33) from 0, 30
While the belt length up to the above is shortened, each belt 33 is unwound from the take-up pulley 35 by the forward rotation of the motor 36 to extend the belt length.

In this embodiment, the moving pulley 44
Is stopped at the tip position of the guide groove 42 described below, the lid 1 is wound by the winding and unwinding operations of the belts 33, 33 by the two winding pulleys 35, 35 of the belt winding device 37.
0 is rotated between a closed position and an open position to open and close, and when each belt 33 is wound by the belt winding device 37, the belt fixing member 3 is pulled from the guide pulleys 30, 30.
By shortening the belt length up to 1 (strictly described below, fixed pulley 40), the lid 10 is closed in a horizontal posture as shown in FIG.
When it is paid out from, the length of the belt is increased to open the lid 10 in a tilted posture as shown in FIG.

As shown in detail in FIG. 7, the belt fixing member 3 is attached to the pair of left and right lower ladder attaching members 20, 20.
A fixed pulley shaft 39 extending in the left-right direction at a position corresponding to the length direction of 1 and the lid 10 (a position directly above the belt fixing member 31 in the closed state) is rotatable between both ladder attachment members 20, 20. The fixed pulley shaft 39 is inserted into and supported by the fixed pulley 4 on both left and right sides in correspondence with the position of the belt 33.
0, 40 (only one shown) are attached.
That is, each of the fixed pulleys 40 is axially supported on the rear surface of the front end portion of the lid 10 so as to be immovable in correspondence with the belt fixing member 31.

Further, each lower ladder mounting member 20 has a lid 10 more than the fixed pulley 40 (belt fixing member 31).
Ladder mounting member 2 with a guide hole 42 (which may be a guide groove formed of a concave groove) extending substantially parallel to the lid 10 on the base end side of
It is formed so as to correspond to the left and right of the 0 guide hole 42. As shown in FIG. 7, the guide hole 42 extends from the tip end position between the belt fixing member 31 and the fixed pulley shaft 39 to the lid 1.
It extends parallel to the base end side of 0 along the lid 10 and reaches the base end position after bending so as to approach the back surface of the lid 10 at the other end side portion. In the guide hole 42, both ladder mounting members 2
A movable pulley shaft 43 extending in the left-right direction between 0 and 20
Is slidably supported through, and moving pulleys 44, 44 are attached to the left and right sides of the moving pulley shaft 43 in correspondence with the position of the belt 33. That is, each moving pulley 44 is moved relative to the guide hole 42 by the moving pulley shaft 43.
It is movably supported along the guide hole 42 via.

The ends of the moving pulley shafts 43, which are the shafts of the moving pulleys 44, project outside the ladder mounting members 20 (opposite to the opposing ladder mounting members 20) by a predetermined dimension, and the projecting portions thereof First link material 46, 46, respectively
One end (only one is shown) is rotatably connected. The other end of each first link member 46 is connected to the ladder 1
3, the end portion of the middle ladder portion 15 on the upper ladder portion 14 side,
Specifically, in the hinge 22 connecting the upper and middle ladder portions 14 and 15 to each other, the hinge 47 is rotatably connected to the bracket 47 integrally attached to the piece 24 on the side of the middle ladder portion 15 via the connecting shaft 48.

Then, as shown in FIG. 7, a belt 33 between the guide pulleys 30, 30 and the belt fixing member 31.
The intermediate portion of the lower side of the fixed and movable pulleys 40, 44 is moved to the movable pulley 44 as it goes from the belt fixing member 31 side (the tip side of the belt 33) toward the belt winding device 37 side (the proximal end side). After being wound from the side and bent to the fixed pulley 40 side at the lid base end side (right side in FIG. 7), that is, the lid tip side (left side in FIG. 7), it is wound around the fixed pulley 40 from below and The belt winding device 37 is wound around the base end side of the lid 10 so as to bend at the tip end side of the lid, and when the lid 10 is positioned at the open position and is opened in the inclined posture.
By the winding and unwinding operations of each belt 33 by the moving pulley 44, the moving pulley shaft 43 moves the moving pulley 44 along the guide hole 42 of the lower ladder mounting member 20, and the moving pulley 44 moves to move the first link member. The middle ladder portion 15 is rotated together with the lower ladder portion 16 via a shaft 46 about a shaft 25 of a hinge 22 which is a connection point with the upper ladder portion 14.

Further, a plate-like bracket 50 extending upward is provided at the tip of the lid 10, more specifically, at the tip of the right lower ladder mounting member 20 at the tip of the lid. Are fixed integrally by 51, ... At one end of the bracket 50, one end of the second link member 52 is rotatably supported by a connecting shaft 53 extending in the left-right direction. The other end of the second link member 52 is rotatably connected to a connecting member 54 mounted near the middle ladder portion 15 in the middle portion of the lower ladder portion 16 via a horizontal connecting shaft 55, and a lid. When the ladder 13 is extended in the open state of 10, the opening angle by the weight of the lower ladder portion 16 is adjusted by the second link member 52.

Further, the second link member 52 is extended to one end side thereof by a predetermined dimension, and the engaging pin 5 is provided at the extension thereof.
7 are protruded. A base end of a lever member 58 is rotatably supported by a connecting shaft 53 that supports one end of the second link member 52 on the bracket 50, and the base end of the lever member 58 has a connecting shaft 53. Arc hole 59 centered on
(A circular groove formed of a concave groove may be formed), and the engagement pin 57 is slidably engaged with the circular arc hole 59, the ladder 13 is in a folded state, and the lever member 58 is illustrated. 7, the engaging pin 57 engages with one end portion (the left end portion in the figure) of the arc hole 59, and the base end portion of the lever member 58 covers the second link member 52. It is connected to the end portion on the tip side so as to rotate integrally.

Further, a tension spring 62 is extended between the tip of the lever member 58 and a spring stopper member 60 attached to an intermediate portion of the lower ladder portion 16 which is integral with the lid 10. 7 urges the lever member 58 to rotate counterclockwise in FIG. 7 so that the ladder 13 is extended.

Reference numeral 66 denotes a plate member 5a on the tip side of the lid of the frame body 5.
The lock device provided on the lock lock device holds the lid 10 in the closed position. 2 and 3, the locking device 66 is formed by notching the plate member 5a in a rectangular cross section at the lower end portion of the plate front end side plate member 5a of the frame body 5 on the inner surface side of the frame. It has a latch receiver 67 as an engaging portion composed of a recessed portion. on the other hand,
On the rear surface of the tip of the lid 10, the latch receiver 6 on the side of the frame 5 is provided.
7, a solenoid 69 arranged corresponding to 7 is attached and fixed, and this solenoid 69 is provided with a latch bolt 70 which is supported so as to be retractable with respect to the inside thereof, and the latch bolt 70 is engaged with the latch receiver 67 at its tip end. Is possible,
The upper surface of the latch bolt 70 has an arcuate curved surface. A latch bolt 70 (not shown) is provided in the solenoid 69.
A spring for urging the lid 10 in the projecting direction is accommodated. When the lid is closed, the latch bolt 70 is projected from the solenoid 69 by the spring and engaged with the latch receiver 67 on the side of the frame body 5, thereby closing the lid 10. On the other hand, when the lid is opened, by energizing the solenoid 69 of the locking device 66, the latch bolt 70 is retracted into the solenoid 69 against the biasing force of the spring, and the engagement between the latch bolt 70 and the latch receiver 67 is released. As a result, the lid 10 can be opened and operated. Normally, as shown in FIG. 3, when the lid 10 is locked in the closed position, a predetermined gap s is formed between the lower surface of the protruding latch bolt 70 and the inner lower surface of the latch receiver 67. The lid 10 is connected to the frame body 5.

As shown in FIG. 4, the solenoid 69 of the lock device 66 is energized in the motor accommodating chamber 7 of the frame 5 along with the operation of the belt winding device 37. It is controlled by the controller 111 (described outside the room 7). Although not shown, various switches and sensors for opening and closing the lid 10 to extend and retract the ladder are connected to the controller 111. Here, the signal processing operation performed in the controller 111 until the lid 10 in the closed state is opened after being unlocked will be described with reference to FIG.

First, in step S1, when the user turns on the lowering switch to input a lowering signal from the lowering switch, the process proceeds to step S2 and the lock device 6 is operated.
The solenoid 69 of No. 6 is energized, the motor 36 of the belt winding device 37 is reversed in the next step S3, the base end of the belt 33 is wound around each winding pulley 35, and the lid 10 is closed.
Is further rotated in the closing direction, and the tip of the lid 10 is pulled by the belt 33 and pulled up.

After that, the process proceeds to step S4, the tip of the lid 10 is raised by a predetermined amount, and the lower end of the latch bolt 70 in the protruding state of the locking device 66 and the latch receiver 67 on the frame 5 side.
It is determined whether or not the motor 36 has rotated in the reverse direction until a gap s is formed between the motor 36 and the lower end surface. If this determination is NO, the process returns to step S3 and the reverse rotation of the motor 36 is continued.

The motor 36 reversely rotates until a gap s is formed between the lower end of the latch bolt 70 and the lower end surface of the latch receiver 67 on the frame 5 side, and the determination in step S4 is YES.
Then, the latch bolt 70 is retracted into the solenoid 69 against the biasing force of the spring, and the state is maintained. Thereafter, in step S5, the motor 36 of the belt winding device 37 is normally rotated this time to feed each belt 33 out of the winding device 37, and the lid 10 is rotated in the opening direction to be opened.

In this embodiment, steps S2 to S4 are performed.
Accordingly, when the latch bolt 70 is retracted into the solenoid 69 by energizing the solenoid 69 of the lock device 66 and is removed from the latch receiver 67 of the frame body 5, when the lid 10 is unlocked to the closed state, Prior to the release (energization of the solenoid 69), the control means 112 controls the belt winding device 37 so that the belt winding pulley 35 winds the belt 33 and lifts and holds the tip of the lid 10 by a predetermined amount. It is configured.

Reference numeral 63 is a middle portion of the frame body 5 in the longitudinal direction and the lid 1.
0 is a link mechanism that is installed between the back surface of 0 and an intermediate portion in the longitudinal direction and that connects two links 64 and 65. The direction in which the link 65 on the lid 10 side extends the link mechanism 63 by a spring (not shown) The link mechanism 63 adjusts the open position of the lid 10.

Next, the handling operation of the ladder device of the above embodiment will be described. First, when the ladder device is not used and the ladder 13 is folded, as shown in FIG.
The lid 10 closes the ceiling opening 3, and the ladder 13 is housed on the back side (upper side) of the lid 10. In this closed state, the base ends of the left and right belts 33, 33 are wound up by the belt winding device 37 and pulled, so that the belt length from the guide pulleys 30, 30 to the fixed pulley 40 becomes short. ing. That is, the intermediate portion of each belt 33 is wound around the guide pulleys 30 and 30, and the guide pulleys 30 and 30 are arranged on the frame body 5 above the position of the hinge 11 to which the base end portion of the lid 10 is attached. Therefore, due to the difference in height between the guide pulleys 30 and 30 and the hinge 11, the end of the lid 10 is suspended by the belt 33.

Further, in the lock device 66, the latch bolt 70 projects from the solenoid 69 at the tip of the lid 10 by the biasing force of the spring, and the projecting latch bolt 70 engages with the latch receiver 67 on the frame 5 side. By this engagement, the lid 10 is locked and held in the closed position.

Further, the intermediate portion of each belt 33 on the tip end side is fixed to the fixed pulley 40 and the movable pulley 44 on the base end side of the lid of the movable pulley 44 from the front end side of the belt 33 toward the base end side. Since the fixed pulley 40 is bent over to the base end side of the lid 10 after being bent toward the 40 side, the belt 33 is pulled by each take-up pulley 35 of the belt take-up device 37. At this time, the movable pulley 44 (movable pulley shaft 43) is pulled toward the tip side of the lid by the spans on both sides of the belt 33 wound around the movable pulley 44 and is positioned at the tip position of the guide hole 42 in the lower ladder attachment member 20.

In this manner, with the lid 10 closed and the ladder 13 folded and stored in the ceiling opening portion 3, the user turns on the lowering switch to open the lid 10 and extend the ladder 13. When the descending signal from the descending switch is input to the controller 111 at the time of lowering, the motors 36 of the belt winding device 37 are first reversed by a predetermined amount by the control of the controller 111, and the winding pulleys 35 cause the motors 36 to reverse. The base end portion of the belt 33 is wound up and the lid 10 is further rotated in the closing direction (clockwise direction in FIG. 4), whereby the tip end portion of the lid 10 is pulled by the belt 33 and pulled up.

After that, the tip of the lid 10 is lifted by a predetermined amount, and the latch bolt 70 with the locking device 66 in the projecting state.
When it is considered that the motor 36 reversely rotates until a predetermined gap s is formed between the lower end of the lock receiver 67 and the lower end surface of the latch receiver 67 on the frame body 5 side, the solenoid 69 of the lock device 66 is energized. By energizing the solenoid 69, the latch bolt 70 retracts into the solenoid 69 against the urging force of the spring, and in this state, the lock device 66 is unlocked and the lid 10 is rotatable in the opening direction. Become. Next, while the unlocked state of the lock device 66 is maintained, the motor 36 of the belt winding device 37 is normally rotated, for example, and the belt 33 is paid out from each of the winding pulleys 35. As the tension of the belt 33 decreases as the belt 33 is unwound from the winding pulley 35, the lid 10 pivots counterclockwise in FIG. 4 around the hinge 11 at the base end thereof to open. The belts 33 extend from the belt winding device 37 while being guided by the guide pulleys 30, 30 in accordance with the opening operation.

In this case, when the lid 10 is opened by releasing the lock by the locking device 66 as described above, each winding of the belt winding device 37 is performed before the lid 10 is unlocked by the locking device 66. Since the take-up pulley 35 winds the belt 33 and the tip of the lid 10 is lifted and held by a predetermined amount, for example, as shown in FIG. 2, the lid 33 is loosened due to the looseness of the belt 33 or the weight of the lid 10. Even if 10 is drooping and the lower end of the latch bolt 70 in the lock device 66 is in pressure contact with the lower end of the latch receiver 67,
Along with the lifting operation of the lid 10, as shown in FIG. 3, a predetermined gap s is formed between the lower end of the latch bolt 70 and the lower end of the latch receiver 67 on the frame 5 side. Therefore,
Thereafter, when the lid 10 is lifted, the lock of the locking device 66 is released, and when the solenoid 69 is energized to disengage the latch bolt 70 and the latch receiver 67, the latch bolt 70 is locked. The gap s allows the latch receiver 67 to be smoothly disengaged without resistance. Therefore, the lock device 66 can be reliably unlocked despite the looseness of the belt 33 and the hanging down of the lid 10.

Then, as shown in FIG. 5, when the lid 10 is rotated to the ceiling 1 to a predetermined angle θ and reaches the open position where the tip end thereof is slanted down, the lid 10 is linked. Is stopped and held in the open position by.

Even after the lid 10 is positioned at the open position in this way, the belt 33 is continuously paid out from each winding pulley 35. By feeding the belt 33,
The belt 33 can move to the moving pulley 44 side while rotating through the fixed pulley 40, the pulling force of the belt 33 pulling the moving pulley 44 becomes small, and the moving pulley 44 is guided to the guide hole 42. Along with this, it becomes possible to move to the base end position side.

At this time, when the lid 10 is moved to the open position, the center of gravity of the portion where the middle and lower ladder portions 15 and 16 are combined has the hinge 22 which connects the upper ladder portion 14 and the middle ladder portion 15. Since it is closer to the lid 10 than the vertical plane passing through the shaft 25, the middle and lower ladder portions 15 and 16 cannot be opened in the extension direction as they are.

However, one end of the second link member 52 is pivotally supported by the lower ladder mounting member 20 on the right side located on the rear surface of the tip of the lid 10, and the other end of the second link member 52 is attached to the ladder 13.
The lower ladder portion 16 is rotatably connected to an intermediate connecting member 54, and the base end portion of the lever member 58 is connected to one end portion of the arc hole 59 with respect to the end portion of the second link member 52 on the tip end side of the lid. Is integrally pivoted by the engagement of the engagement pin 57 of
This lever member 58 is urged by the tension spring 62 so that the ladder 1
3 is urged to rotate so that one end of a first link member 46 is connected to the moving pulley shaft 43 supporting the moving pulley 44. The other end of is connected to the bracket 47 at the end of the middle ladder 15 of the ladder 13 on the upper ladder 14 side.
Therefore, from these structures, the rotational biasing force of the lever member 58 by the tension spring 62 acts on the moving pulley 44 via the first link member 46, and the moving pulley 44 is closed along the guide hole 42. It is urged in the direction toward the base end. Then, when the tensile force of the belt 33 becomes smaller than the rotational biasing force of the lever member 58 by the tension spring 62, the middle ladder portion 15 rotates around the hinge 22 together with the lower ladder portion 16, and The center of gravity of the ladder portions 15 and 16 moves to the side opposite to the lid 10 with respect to the vertical plane passing through the shaft 25 of the hinge 22. Further, upon receiving the rotational biasing force of the lever member 58, the moving pulley 44 starts to move to the base end position side along the guide hole 42.

That is, when the middle and lower ladder portions 15 and 16 are opened with the lid open, even if the center of gravity of the ladder portions 15 and 16 remains on the lid 10 side, the lever member 58 is rotated by the tension spring 62. Due to the biasing force, the center of gravity of the ladder 13 can be smoothly and quickly moved away from the lid 10, and the extension operation of the ladder 13 in the opened state can be automatically started.

After the movement of the center of gravity, the ladder portions 15 and 16 try to open in the extension direction due to their own weight.
Therefore, the moving pulley 44 receives the turning biasing force of the lever member 58 by the tension spring 62, and subsequently receives the turning biasing force of the middle and lower ladder portions 15 and 16 by its own weight, and moves along the guide hole 42. It moves to the end position side, whereby the middle and lower ladder portions 15 and 16 continue to rotate in the extension direction. Then, as shown in FIG. 6, when the middle and lower ladder portions 15 and 16 are rotated so as to be aligned with the upper ladder portion 14 and the ladder 13 is extended, and the lower end thereof comes into contact with the floor surface. , The moving pulley 44 has a guide hole 4
Positioned at the base end position of 2, the motor 36 of the belt winding device 37 is stopped in this state, the feeding of the belt 33 from the winding pulley 35 is stopped, and the ladder 13 is held in the extended state.

At this time, one end of the second link member 52 is pivotally supported by the lower ladder mounting member 20 on the right side located on the rear surface of the end of the lid 10, and the other end of the second link member 52 is attached to the ladder 1.
3 is rotatably connected to the connecting member 54 at the intermediate portion of the lower ladder portion 16 of the third ladder 3, so that the lid 10 is attached to the ladder 13
The upper ladder portion 14 and the lower ladder portion 16 which are fixed to each other are connected by the middle ladder portion 15 as well as the lower ladder portion 1
The middle portion of 6 and the tip portion of the lid 10 are connected by the second link member 52. Therefore, with the lid open, the ladder 1
When the 3 is extended, the middle and lower ladder parts 15 and 16 are connected to the hinges 22 that connect the upper and middle ladder parts 14 and 15.
And a hinge 26 that connects the middle and lower ladder parts 15 and 16
And a connecting shaft 55 that connects the lower ladder portion 16 and the second link member 52, and a connecting shaft 53 that is a connecting portion of the second link member 52 to the tip portion of the lid 10, and have four positions as apexes. While keeping the parallelogram, it also rotates like a magic hand. Therefore, the lower ladder section 16 is replaced by the middle ladder section 1
There is no problem that the lower ladder portion 16 is suddenly opened and the user hits his / her head or pinches his / her finger.

On the other hand, after the ladder device is used, when the ladder 13 in the extended state shown in FIG. 6 is folded and accommodated in the ceiling opening portion 3, the motor 36 of the belt winding device 37 is used.
For example, the belt 33 is reversed and the belt 33 is wound around each winding pulley 35. With this winding, the moving pulley 44 at the base end position of the guide hole 42 is pulled from the fixed pulley 40 and the belt fixing member 31 to the tip side of the lid by the belt 33, and the moving pulley 44 moves along the guide hole 42. Move from the base position to the tip position. This moving pulley 4
By the movement of 4, the first link member 46, the end portion of which is connected to the moving pulley 44, is changed in the clockwise direction in the drawing to push up the end portion of the middle ladder portion 15 on the upper ladder portion 14 side, and the middle portion thereof. The ladder portion 15 is rotated around the hinge 22 so that the ladder portion 15 faces the upper ladder portion 14, and the lower ladder portion 16 rotates around the hinge 26 so that the ladder portion 15 faces the middle ladder portion 15.
Folding of 3 begins. Then, when the movable pulley 44 reaches the tip position of the guide hole 42, the state immediately after opening the lid is restored, and the ladder 13 is folded into a substantially N-shape (state in FIG. 5).

Even after the ladder 13 is folded, the belt 33 is continuously wound by the belt winding device 37.
Then, when the movable pulley 44 reaches the tip position of the guide hole 42, the movable pulley 44 cannot move further, so that the movable pulley 44 functions as a mere pulley for direction change, and the fixed pulley 40 in the belt 33. The part from to the tip is locked. Therefore, with the winding of the belt 33 by the winding device 37, the tip of the lid 10 whose tip is fixed by the belt fixing member 31 is pulled toward the guide pulley 30, and the guide pulleys 30, 30 While the fixed pulley 40, that is, the belt length to the tip of the lid 10, is shortened, the tip of the lid 10 is pulled up and the lid 10 is rotated in the closing direction.
When is rotated to the closed position, the winding of the belt 33 by the belt winding device 37 is stopped, and the lid 10 is stopped and held at the closed position. As a result, the ceiling opening 3 is closed, and the ladder 13 is housed in the folded state on the back side (upper side) of the lid 10 (state of FIG. 4).

In this embodiment, the belt winding device 37 is attached to the frame 5 in the ceiling opening 3, that is, to the ceiling 1 side, and the belt 33 is wound around each winding pulley 35 of the belt winding device 37. , The belt fixing member 31 near the tip of the lid 10 is pulled, and the lid 10 is pulled up and closed against the weight of the ladder 13 and the lid 10, while the lid 10 is opened and lowered by the weight of the ladder 13 and the lid 10. Since the belt 33 may be unwound from the belt winding device 37, the load acting on the hinge 11 of the lid 10 is extremely small and its durability can be ensured, and the belt 33 can be unwound or wound up by the belt winding device 37. Lid 10 depending on speed
Can be opened and closed smoothly.

Moreover, even when the ladder 13 expands and contracts when the lid 10 is opened, the hinge 11 of the lid 10 is less burdened, and the durability can be further ensured, and the belt 33 can be wound up. Also, the ladder 13 can be smoothly expanded and contracted in accordance with each feeding speed.

The upper ladder portion 14 of the ladder 13 is the lid 10.
The belt 33 is attached to the back surface of the cover 10 with a space therebetween, and the belt 33 is fixed between the upper ladder portion 14 and the back surface of the lid 10 so that the belt 33 is almost always parallel to the lid 10.
Since the belt 33 is stretched between the belt 33 and the belt 30, the belt 33 is hidden behind the upper ladder portion 14, a sufficient arrangement space can be secured, and the appearance of the ladder 13 can be improved.

(Modification of Locking Device) FIGS. 8 and 9 show a modification of the locking device 66 (note that the same parts as those in FIGS. 2 and 3 are designated by the same reference numerals and their detailed description will be omitted. ), Contrary to the first embodiment, the solenoid 69 is arranged on the frame 5 side.

That is, in this example, the hook receiver 73 is attached to the rear surface of the tip of the lid 10 by the fastening member 75. The hook receiver 73 extends upward from the back surface of the lid 10, and an engaging hole 74 as an engaging portion is formed at a predetermined position in the middle portion thereof. The upper end portion of the hook receiver 73 has a locking piece 77a of a hook 77, which will be described later, in the engagement position.
Is bent to one side so as to guide to the engaging hole 74.

On the other hand, the support shaft 7 is provided on the inner surface of the plate member 5a of the frame body 5.
6 is provided so as to project corresponding to the hook receiver 73 when the lid is closed, and a hook 77 is rotatably supported at the upper end of the support shaft 76. At the lower portion of the hook 77, a locking piece portion 77a which is engageable by being inserted into the engaging hole 74 of the hook receiving portion 73 from the side opposite to the bending direction of the upper end portion thereof partially cuts the lower portion of the hook 77. When the hook 77 is rotated in the counterclockwise direction in FIG. 8 and is positioned at the engagement position, the locking piece 77a of the hook 77 is engaged with the engagement hole 7.
4, while the hook 77 is rotated clockwise to the disengagement position, the locking piece 7
7a comes out from the engagement hole 74, and the engagement between the two is released. Reference numeral 113 is a micro switch that detects that the hook 77 is in the engagement position.

A solenoid 69 is attached to the inner surface of the plate 5a of the frame body 5. The solenoid 69 has a rod 78 extending in the horizontal direction which is retracted by the energization of the solenoid 69, and the tip of the rod 78 is connected to the intermediate portion of the hook 77 by a pin 79, a link 80 and a pin 81. Further, a spring 82 for urging the rod 78 in the projecting direction is provided. When the solenoid 69 is not energized, the rod 82 is projected from the solenoid 69 by the spring 82, and the hook 77 connected to the tip of the rod 78 is reversed. While rotating clockwise to urge the engagement position, when the solenoid 69 is energized, the rod 78 is retracted into the solenoid 69 against the urging force of the spring 82, and the hook 77 is rotated clockwise. Are moved to the disengagement position.

The rod 78 has an intermediate portion at the tip portion of the shaft 8.
3, one end of a manual lever 84 rotatably supported by the frame plate member 5a is connected by a pin 85, and the other end of the manual lever 84 serves as an operating portion and extends below the frame body 5. When the lock device 66 cannot be unlocked by energizing the solenoid 69 due to a power failure, for example, the frame 5
By rotating the other end (operating portion) of the manual lever 84 extending downward from between the end portion of the lid 10 and the tip portion of the lid 10, the hook 77 is disengaged from the engagement position via the rod 78. It is designed to be rotated.

Therefore, also in this embodiment, the same operational effects as the above can be obtained. Ie, hook 7
Even if 7 is in the engagement position and the upper end of the locking piece 77a at the tip thereof is in pressure contact with the upper side of the peripheral edge of the engagement hole 74 of the hook receiver 73, the tip of the lid 10 can be pulled up when the lid is opened. Then, the locking piece 77a of the hook 77 relatively moves toward the center of the engaging hole 74, and the upper end of the locking piece 77a and the engaging hole 74 are moved.
A gap s is formed between the upper part of the peripheral edge and the gap s, so that the hook 77 can be smoothly and reliably rotated to the disengagement position, and the lock device 66 can be reliably unlocked. .

(Embodiment 2) FIGS. 10 to 12 show Embodiment 2 of the present invention (note that the same parts as those in FIGS. 4 to 6 are designated by the same reference numerals and detailed description thereof will be omitted). It is applied to a sliding ladder device.

In this embodiment, as shown in FIGS. 10 and 11, the ladders 13 'are the upper, middle, and lower ladders 1'.
Although divided into 4, 15 and 16, unlike the first embodiment, the adjacent ladder portions 14 and 15 (or 15, 16) are adjacent to each other.
One is slidably connected to the other,
The ladder portions 14, 15, 16 are configured to slide and contract when contracted.

That is, the upper ladder portion 14 is attached and fixed to the back surface of the lid 10 by the ladder attaching members 19 and 20.
A guide rail 87 is provided on an upper surface (front surface) of each of the left and right vertical frames 14a, 14a of the upper ladder portion 14, and a first guide bracket 88 is provided at a lower end portion of each guide rail 87.
The lower fitting part is fitted and fixed. The upper fitting portion of the first guide bracket 88 projects upward from the guide rail 87, and on the projecting portion, two pairs of rollers 89, 89, ... Spaced in the length direction of the guide rail 87 are axially supported. Has been done.

Left and right vertical frames 15 in the middle ladder section 15
Guide rails 90 and 91 are provided on the upper surface (front surface) and the lower surface (rear surface) of each of a and 15a, and the lower guide rail 91 has two pairs of front and rear rollers 89, 89, ... At the lower end of the upper ladder portion 14. Is rotatably fitted. At the upper end of the lower surface side guide rail 91, the first
Second guide bracket 9 similar to guide bracket 88
The upper fitting portion of the second guide bracket 92 is fitted and fixed, and the lower fitting portion of the second guide bracket 92 is a lower guide rail 91.
Of the guide rail 91
Of two pairs of rollers 93, 93, ...
Each roller 93 is rotatably fitted to a guide rail 87 on the upper surface of the upper ladder portion 14 described above. As a result, the middle ladder portion 15 is connected to the upper ladder portion 14 so as to slide and expand.

On the other hand, the lower fitting portion of the third guide bracket 94 is fitted and fixed to the lower end portion of the upper guide rail 90 of the middle ladder portion 15, and the upper fitting portion of the third guide bracket 94 is fixed. Are projected above the guide rail 90, and two pairs of rollers 95, 95, ... Are axially supported by the protruding portion at intervals in the length direction of the guide rail 90.

Further, a guide rail 96 is provided on the lower surface (back surface) of each of the left and right vertical frames 16a, 16a of the lower ladder portion 16, and the guide rail 96 has two pairs of front and rear rollers at the lower end of the middle ladder portion 15. 95, 95, ...
Is rotatably fitted. The upper fitting portion of the fourth guide bracket 97 is fitted and fixed to the upper end portion of the guide rail 96.
A pair of rollers 98, 98, which are spaced apart in the longitudinal direction of the guide rail 97 are pivotally supported at the lower fitting portion of the guide rail 97. Each of the rollers 98 is a guide rail 90 on the upper surface of the middle ladder portion 15. Is rotatably fitted to. As a result, the lower ladder portion 16 is connected to the middle ladder portion 15 so as to slide and expand and contract. Then, the middle and lower ladder portions 15 and 16 are slid until the rollers 93 and 98 on the second and fourth guide brackets 92 and 97 are located at the upper ends of the guide rails 87 and 90, respectively, so that both ladder portions 1
Ladder 5 and 16 are stacked on the upper ladder 14
While contracting 3 ', the middle and lower ladders 15, 16 are slid until the rollers 93, 98 come into contact with the first and third guide brackets 89, 94 at the lower ends of the guide rails 87, 90, respectively. Both ladders 15,
Ladder 1 with 16 protruding from the upper ladder portion 14
Extend 3 '.

Then, as shown in FIG. 12, each belt 33 having the base end portion wound around each winding pulley 35 of the belt winding device 37 has a plate member 5a at the middle portion in the longitudinal direction of the frame body 5.
The pulley 1 is hung on a pulley 99 rotatably supported on the inner surface and then hangs downward, and further rotatably supported on an intermediate portion of the upper ladder portion 14.
00, extending toward the lower end side of the ladder portion 14 and hung from the pulley 101 pivotally supported on the lower end side toward the upper end side of the ladder portion 14 again to a pair of pulleys 102 pivotally supported on the upper end portion. After that, it passes through the inside of the guide rail 87 of the upper ladder portion 14 and extends downward, and the tip thereof is the second guide bracket 9 described above.
2 is connected to the lower fitting portion.

Further, one end of the operating belt 103 is connected to the lower fitting portion of the fourth guide bracket 97 having the upper fitting portion fitted and fixed in the guide rail 96 of the lower ladder portion 16. . The operating belt 103 is inserted through the upper guide rail 90 of the middle ladder portion 15 and wound around a pair of pulleys 104, 104 pivotally supported on the upper end of the vertical frame 15a of the middle ladder portion 15. This pulley 10
4, 104 to the lower guide rail 9 of the middle ladder section 15
1 which is supported by the lower ends of the vertical frames 15a, 15a
It is wound around a pair of pulleys 105, 105, passes through the inside of the upper guide rail 90 again from the pulleys 105, 105, and the other end is fitted under the original fourth guide bracket 97 via the tension adjusting member 106. It is connected to the joint. Further, the intermediate portion of the operating belt 103 is integrally connected and fixed to the lower fitting portion of the first guide bracket 88 at a predetermined position of the insertion portion of the lower guide rail 91.

With such a belt winding structure, the lid 10 is opened and closed by feeding and winding the belt 33 by the winding pulley 35 of the belt winding device 37, and the middle and lower ladder portions 15 and 16 are slid. Ladder 13 '
When the belt 33 is extended and contracted and the belt 33 is extended, first, the lid 10 is rotated from the closed posture and opened, and then the ladder 13 'in the contracted state in the opened state is extended. That is, the second guide bracket 92 to which the tip of the belt 33 is connected is slid downward together with the middle ladder portion 15 to extend the middle ladder portion 15 from the upper ladder portion 14, and to the lower side of the middle ladder portion 15. 12 causes the operating belt 103 to rotate counterclockwise around the middle ladder portion 15 in FIG. 12 with reference to the connecting portion of the first guide bracket 88 in the middle thereof, and the fourth guide bracket 97 is integrated with it. The lower ladder section 16 is slid downward together with the lower ladder section 16 to extend the lower ladder section 16 from the middle ladder section 15. On the other hand, when the belt 33 is wound around the winding pulley 35, the ladder 13 ′ in the extended state is contracted, and the second guide bracket 92 is pulled together with the middle ladder portion 15 and slid upward to slide the middle ladder portion 15 up. Ladder part 14
12 and moves the actuating belt 103 clockwise around the middle ladder portion 15 in FIG. 12 with the connecting portion of the first guide bracket 88 at the middle portion as a reference by sliding the upper ladder portion 15 upward. Then, the fourth guide bracket 97 is slid upward together with the lower ladder portion 16 to stack the lower ladder portion 16 on the middle ladder portion 15. After the ladder 13 'is contracted, the lid 10 is rotated from the open posture to be closed. It is like this.

In this embodiment, the locking device 66 similar to that of the first embodiment is attached to the tip of the lid 10 and the frame 5 corresponding thereto (FIGS. 2 and 3).
reference). The operations of the locking device 66 and the belt winding device 37 when the lid is closed are the same as in the first embodiment (see FIG. 1).

Therefore, in the case of this embodiment, when the lid 10 of the ceiling opening 3 is unlocked and opened from the closed state, the lower end of the latch bolt 70 becomes the lower end of the latch receiver 67 on the frame 5 side in the closed state. Even if pressed, the tip of the lid 10 is pulled up when the lid is opened, so that a gap s is formed between the lower end of the latch bolt 70 and the lower end of the latch receiver 67, and the gap s facilitates the movement to the retracted position. It is done surely. Therefore, the unlocking of the lock device 66 that locks the lid 10 in the closed state in the sliding ladder device when the lid is opened can be reliably performed.

In each of the above embodiments, the lid 10 is always wound by the belt 33 of the belt winding device 37 when the lid is opened.
The lock device 66 is unlocked after that, but in addition to this, when the lid is opened, the loosened state of the belt 33 or the closed position of the lid 10 is detected to determine whether they are in a predetermined state. It is also possible to wind the belt 33 only at the time of.

[0075]

As described above, according to the invention of claim 1, the telescopic ladder is housed in the ceiling opening in the contracted state, and the rotatable lid for opening and closing the ceiling opening is provided. For a ceiling ladder device in which the belt member whose tip is attached to the lid is wound or unwound by the winding means on the ceiling side to open and close the lid, the locking means for locking the lid closed is released when the lid is opened. When it is done, prior to its release,
By winding the belt member by the winding means and lifting and holding the tip of the lid by a predetermined amount, and releasing the lock in the lifted state, even if the belt member is loosened or the lid hangs down, A gap can be formed between the engaging portion and the engaging portion of the locking means, and the engaging portion can be easily and reliably disengaged from the engaging portion with a small resistance, thereby ensuring the lid opening operation in the ceiling ladder device. Smoothing can be achieved.

According to the invention of claim 2, since the ladder is a folding ladder, the lid of the ceiling ladder device having the folding ladder can be smoothly unlocked from the closed state, and the opening operation of the lid can be performed. It is possible to achieve certainty and smoothness.

According to the third aspect of the present invention, since the ladder is a slide ladder, the lid of the ceiling ladder device having the sliding ladder can be smoothly unlocked from the closed state, and the lid opening operation can be performed. Certainty and smoothness can be achieved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a signal processing operation performed by a controller when a lid is opened according to a first embodiment of the present invention.

FIG. 2 is a side view showing a state in which the lock device locks the lid in the first embodiment.

FIG. 3 is a view corresponding to FIG. 2 showing a state in which the lid is lifted at the time of opening the lid in the first embodiment.

FIG. 4 is a side view showing a stored state of the ladder in the first embodiment.

FIG. 5 is a side view showing a state in which a lid is opened.

FIG. 6 is a side view showing a state where the ladder is extended.

FIG. 7 is an enlarged side view showing the mechanism at the tip of the lid.

FIG. 8 is a plan view showing a modification of the lock device.

FIG. 9 is a side view showing a modified example of the lock device.

FIG. 10 is a view corresponding to FIG. 6 and showing Embodiment 2 of the present invention.

FIG. 11 is a perspective view showing a ladder device according to a second embodiment.

FIG. 12 is a perspective view showing a ladder expansion / contraction mechanism according to a second embodiment.

[Explanation of symbols]

 1 Ceiling 3 Opening 5 Frame 10 Lid 11 Hinge 13, 13 'Ladder 14 Upper Ladder 15 Upper Ladder 16 Lower Ladder 16 Lower Ladder 33 Belt 35 Belt Winding Pulley 36 Motor 37 Belt Winding Device (Belt Winding Means) 40 Fixed pulley 42 Guide hole 44 Moving pulley 46 First link material 52 Second link material 58 Lever member 66 Lock device (locking means) 67 Latch receiving (engaging part) 69 Solenoid 70 Latch bolt (locking part) 73 Hook receiving 74 Engagement hole (engagement part) 77 Hook (locking part) 111 Controller 112 Control means s Gap

Claims (3)

[Claims] 1. A frame body arranged around and fixed to a ceiling opening of a room, a lid whose base end is rotatably attached to the frame body, and a lid which opens and closes the ceiling opening, and mutually contractible. A ladder that is composed of a plurality of connected ladders and is stretched between the ceiling opening and the floor in a used state, and is stored in the ceiling opening in a contracted state when not used, A belt member having a tip connected to the lid, and a belt winding means capable of winding and unwinding the base end side of the belt member, and by the winding and unwinding operation of the belt member by the belt winding means, In a ceiling ladder device configured to open and close at least a lid, an engaging portion provided on one of the frame and the lid and an engaging portion provided on the other of the frame and the lid and engageable with the engaging portion. Has a locking part, and the locking part engages when the lid is closed. Locking means for engaging the lid to lock the lid in the closed state and releasing the lock of the lid in the closed state by the locking means, prior to the release, the belt member is wound and the tip of the lid is located. A ceiling ladder device, comprising: a control unit that controls a belt winding unit so that only a fixed amount is lifted and held. 2. The ceiling ladder device according to claim 1, wherein the ladder is a folding ladder in which adjacent ladder portions are rotatably connected by a hinge, and the ladder portions are folded when contracted. A ladder device for a ceiling, which is characterized by being present. 3. The ceiling ladder device according to claim 1, wherein one of the adjacent ladder portions is slidably connected to the other, and the ladder portion slides and contracts when contracted. A ladder device for a ceiling, which is a configured slide ladder.