JPH05256078A - Ladder device stored in ceiling - Google Patents

Abstract

PURPOSE:To automate folding work and expansion work by fixing the base end of a winding wire to a winding mechanism of a ceiling plenum through an upper step ladder, and winding the middle part of the winding wire on a guide roller of a middle step ladder. CONSTITUTION:When a closed switch is operated, a forward and reverse motor of a winding device 4 is reversed and driven to wind a winding wire 44 on a winding drum. and the wire 44 is superior in pulling capacity of a loose prevention device 5 to tense it in a linear state from a dog-legged state. At that time, a guide roller 46 is lifted up by the wire 44, and accordingly a middle step ladder 3b is turned upward with a hinge 34 as the center to meet the front of the middle step ladder 3b and the front of an upper step ladder 3a with each other. And, at the same time, a lower step ladder 3c is turned with a hinge 33 as the center to meet the rears of the ladders 3b and 3c with each other, and a storing ladder 3 is folded. When the wire 44 is in a linear state, the ladder 3a is pulled out, a cover plate 2 is turned in the closed direction with a hinge 20 as the center, the storing ladder 3 is stored in a ceiling plenum in a state of folding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling storage ladder device used when going in and out of a storage room provided on the ceiling.

[0002]

2. Description of the Related Art Conventionally, an example of a ceiling storage ladder device used for entering and leaving an overhead ceiling storage chamber is, for example, Sekikai Sho 6
The one described in Japanese Patent Publication No. 0-137026 is known. In this conventional ceiling storage ladder device, an upper ladder is fixed to a lid plate of a ceiling opening, and the upper ladder, the middle ladder, and the lower ladder are foldably connected to each other. The folding and unfolding operations were each performed manually.

[0003]

However, in the above-described conventional ceiling storage ladder device, the storage and removal thereof, and the folding and extending of the ladders at each stage are performed manually, so that the work is performed. There was a problem that it became annoying.

In view of the above problems, it is an object of the present invention to provide a ceiling storage ladder device capable of automatically storing and taking out, and folding and extending work of each stage ladder. ..

[0005]

In order to achieve the above object, in the ceiling storage ladder device of the present invention, a ceiling opening is formed in the ceiling, which serves as a doorway to the back of the ceiling. A lid plate that opens and closes the opening is rotatably attached, and a storage ladder is attached to the lid plate. The storage ladder includes an upper ladder, a middle ladder, and a lower ladder that are sized to allow access to the ceiling opening. The upper ladder is attached to the lid plate, and the ladders of each step are aligned in a straight line in the extended state, while the upper ladder and the middle ladder are in contact with each other in the folded state and the middle ladder and the lower ladder are in contact with each other. Are rotatably connected so that their backs come into contact with each other, the tip of the hoisting wire is fixed to the upper ladder, and the base end side of the hoisting wire can be wound up or unwound backward on the ceiling ceiling. A winding mechanism is provided for the middle ladder Is provided with a guide roller around which the middle part of the hoisting wire passes around when the storage ladder is extended, and the storage ladder is provided with the lower ladder when the storage ladder is extended. Landing urging means for urging rotational movement is provided.

[0006]

When the storage ladder is folded and stored, the winding wire is wound by the winding mechanism. In the extended state of the storage ladder, this hoisting wire is wound around the lower part of the guide roller provided on the middle ladder, and the tip is fixed to the upper ladder. The winding of the wire lifts the middle ladder. As a result, the middle ladder rotates upwards about the connecting part with the upper ladder, the front faces of the middle ladder and the upper ladder come into face-to-face contact, and at the same time, the lower ladder connects the connecting part with the middle ladder by its own weight. While rotating downward relative to the center, the back surfaces of the lower ladder and the middle ladder come into contact with each other, that is, the front surface of the upper ladder and the front surface of the middle ladder come into contact with each other, and the rear surface of the middle ladder comes to the rear surface of the lower ladder. Are folded so that they abut each other.

When the base end of the hoisting wire, the intermediate portion wound around the guide roller and the tip fixed to the upper ladder are arranged in a straight line, the upper ladder is lifted upward by the winding mechanism. At the same time, the lid plate rotates in the closing direction.
Therefore, when the lid plate closes the ceiling opening, the storage ladder is folded and stored inside the ceiling.

Next, when the storage ladder is taken out and extended, the hoisting wire is unwound by the hoisting mechanism. By this hoisting wire being unwound, the lid plate and each ladder are folded by the weight described above. The lid plate opens the ceiling opening and the ladders extend by the operation opposite to the storage. That is, first, the lid plate rotates in the opening direction, and with this, the storage ladder in the folded state rotates downward. When the upper ladder rotates to a predetermined angle, the weight of the middle ladder acts on the rotation in the extension direction, and the middle ladder extends and rotates with respect to the upper ladder. At this time, the guide roller of the middle ladder is engaged with the hoisting wire.

Further, the lower ladder is rotated relative to the middle ladder by its own weight in a direction in which the lower ladder is in a hanging state (corresponding to the extending direction), and is urged in the extending direction by the landing urging means. It rotates, so that it extends from the hanging state with respect to the middle ladder to a straight line, and the lower end lands.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing the ceiling storage ladder device of the present embodiment as viewed from the right side, in which 1 is a ceiling opening. The ceiling opening 1 is formed in a ceiling (not shown) to serve as an entrance / exit to a storage room R provided behind the ceiling, and specifically, the opening frame 10 attached to the ceiling.
Is formed on the inner circumference of the.

The lid plate 2 is provided on one side of the opening frame 10.
Is attached by a hinge 20 so as to be rotatable in the vertical direction, and the lid opening 2 allows the ceiling opening 1 to be opened and closed.

A storage ladder 3 is attached to the lid plate 2. The storage ladder 3 includes a left and right side plates 30 and 31, and a tread plate 32 horizontally mounted between the side plates 30 and 31, and includes an upper ladder 3a, a middle ladder 3b, and a lower ladder 3c. The upper ladder 3a is fixedly attached to the inner surface of the cover plate 2, and the ladders 3a, 3b and 3c are aligned in the extended state, while the upper ladder 3a and the middle ladder 3b are in the folded state. The middle ladder 3b and the lower ladder 3c are connected by the hinges 33 and 34 so that the front surfaces contact each other and the back surfaces contact each other. A handrail 35 is fixed to the lid plate 2, and the handrail 35 also serves as a guide frame of a guide roller 45 described later when the storage ladder 3 is folded.

A hoisting device 4 is attached to the storage ladder 3. That is, the hoisting device 4 is connected to the forward / reverse rotation motor 41 attached to the attachment plate 40 fixed to the opening frame 10 so as to project to the underside of the ceiling, and the forward / reverse rotation motor 41 via the speed reducer 42. A winding drum 43 (which constitutes the winding mechanism in the claims), a winding wire 44 whose base end is fixed to the winding drum 43, and a lower end portion of the middle ladder 3b. 2
One guide roller 45, 46 and a guide roller 47 attached to the lower end of the upper ladder 3a are provided. The tip of the hoisting wire 44 is fixed to the upper ladder 3a, and the middle portion of the hoisting wire 44 passes over the guide roller 47 of the upper ladder 3a in the extended state of the storage ladder 3 shown in the drawing to reach the middle ladder. It is wound so as to pass under the guide rollers 45 and 46 of 3b. The forward / reverse rotation motor 41 drives the hoisting wire 44 in the direction of unwinding during the forward rotation, and drives it in the direction of winding up the hoisting wire 44 during the reverse rotation.

The hoisting wire 44 is provided with a slack preventing device 5 and a swinging guide 6 in the vicinity of the winding drum 43.

The slack prevention device 5 includes a winder 50 which is fixed to the upper ladder 3a and constantly winds the pulling wire 51 with a constant force. That is, the metal ring 52 is fixed to the tip of the pulling wire 51 extending from the winder 50, and the winding wire 44 is inserted through the metal ring 52.
The winding force of the winder 50 always pulls the hoisting wire 44 toward the upper ladder 3a to prevent the hoisting wire 44 from loosening.

The oscillating guide 6 swings left and right in association with the rotation of the winding drum 43, and when the winding wire 44 is wound around the winding drum 43, the winding wire 44 forms a dumpling shape. In addition to serving as a stopper, the pulling wire 51 of the slack prevention device 5 is prevented from being wound around the winding drum 43.

Next, FIG. 2 is a perspective view of the ceiling storage ladder device of the present embodiment as viewed from the left side, in which the landing control wire 8 (landing biasing means) is provided along the left side plate 31 of the storage ladder 3. It is stretched. This landing control wire 8
Has one end fixed to the upper ladder 3a and the other end fixed to the lower ladder 3a.
It is fixed to c, and the middle thereof is wound around the upper side of the guide roller 80 provided on the middle ladder 3b. That is, this landing control wire 8 is used for the lower ladder 3c and the upper ladder 3a when the storage ladder 3 is in the extended state as illustrated.
When the fully extended state is reached on the basis of the relative displacement between the and, the lower ladder 3c is pulled upward to urge it to rotate in the extension direction.

Further, the landing control wire 8 is provided with a wire tensioning device 9. The wire tensioning device 9 is for pulling the landing control wire 8 so as not to loosen, and prevents the above-mentioned loosening. Similar to the device 5, the ring metal fitting 92 is fixed to the tip of the pulling wire 91 extending from the winder 90, and the landing control wire 8 is inserted through the ring metal fitting 92 to pull the winding force of the winder 90. The landing control wire 8 is always acted via the wire 91.

Next, FIG. 3 is a block diagram showing the controller 7 for controlling the drive of the forward / reverse rotation motor 41. The controller 7 has an operation switch 71 as an input means.
And fully closed limit switch 72 and lower limit switch 7
3 and 3 are provided.

The operation switch 71 is provided on a wall or the like below the ceiling opening 1, and is provided with an open switch 71a, a close switch 71b, and a stop switch 71c.

The fully-closed limit switch 72 is provided in the ceiling opening 1, and is turned off when the cover plate 2 reaches the fully-closed position, and when the cover plate 2 moves from the fully-closed position to the opening direction. It is a switch that is turned on.

The lowering limit switch 73 is provided at the lower end of the upper ladder 3a, and is turned off when the storage ladder 3 extends and the upper end of the middle ladder 3b comes into contact with the lower end of the upper ladder 3a.
The switch is in the ON state when the two are separated from each other.

Next, the flow of control operation of the controller 7 will be described with reference to the flowchart of FIG.

At step 701, the open switch 71a is turned off.
It is determined whether or not it is N, and if YES, the process proceeds to step 702, and if NO, the process proceeds to step 709. In step 702, the forward / reverse rotation motor 41 is driven in the forward direction, and then in step 70.
Go to 3. At step 703, the closing switch 71b is turned on.
It is determined whether or not it is N. If YES, the process proceeds to step 710, and if NO, the process proceeds to step 704. In step 704, it is determined whether the stop switch 71c is ON,
If yes, go to step 708; if no, go to step 705
Proceed to. In step 705, the lowering limit switch 7
It is determined whether 3 is OFF, and if YES, step 7
Proceed to 06, and if NO, return to step 703. Step 7
In 06, a predetermined time T (a short time of 1 to 10 seconds) is provided inside the controller 7, and this time T is a necessary amount of the hoisting wire 44 after the storage ladder 3 is extended, which will be described later. The timer for measuring (the time for feeding out only) is activated and the routine proceeds to step 707. Step 707
Then, it is determined whether or not the time t measured by the timer has reached the predetermined time T, and the process proceeds to step 708. In step 708, the driving of the forward / reverse rotation motor 41 is stopped. Step 709
Then, it is determined whether or not the closing switch 71b is ON, the process proceeds to step 710 if YES, and step 701 if NO.
Return to. In step 710, the forward / reverse rotation motor 41 is driven in reverse rotation, and then the process proceeds to step 711. In step 711, it is determined whether or not the open switch 71a is ON, and YE
If S, the process proceeds to step 702, and if NO, the process proceeds to step 712. In step 712, it is determined whether or not the stop switch 71c is ON, and if YES, the process proceeds to step 708,
If NO, the process proceeds to step 713. In step 713, it is determined whether or not the fully closed limit switch 72 is OFF. If YES, the process proceeds to step 708, and if NO, the step 7
Return to 11.

Next, the operation of the embodiment will be described.

A) At the time of storage A case in which the storage ladder 3 in the extended state as shown in FIG. 1 is stored in the storage room R behind the ceiling will be described with reference to FIG.

In this case, by operating the closing switch 71b,
The forward / reverse rotation motor 41 of the hoisting device 4 is reversely driven to wind the hoisting wire 44 around the winding drum 43. As a result, the hoisting wire 44 is tense from the "dog-legged" state shown by the two-dot chain line in Fig. 5 (a) to the "straight state" shown by the solid line by overcoming the traction force of the slack prevention device 5. Go And
As shown in FIGS. 5B and 5C, the guide roller 46 is lifted, and accordingly, the middle ladder 3 b is rotated upward about the hinge 34. As a result, the middle ladder 3b
The front side of the upper ladder 3a faces the front side of the upper ladder 3a, and at the same time, the lower ladder 3c is hung by the rotation about the hinge 33 due to its own weight, and the back surface of the middle ladder 3b and the back surface of the lower ladder 3c are Face each other, and the storage ladder 3 is folded.

After that, as shown in FIG. 5D, when the hoisting wire 44 is in the straight state, the upper ladder 3a is pulled up, whereby the lid plate 2 to which the upper ladder 3a is attached is hinged. It rotates in the closing direction about 20. Along with this, the guide rollers 45 of the middle ladder 3b come into contact with the handrails 35 to be guided, and the front surface of the upper ladder 3a and the front surface of the middle ladder 3b come into contact with each other, and the back surface of the middle ladder 3b and the lower step. The back surface of the ladder 3c contacts the storage ladder 3 and the storage ladder 3 is folded.

When the winding wire 44 is further wound up, the pulling wire 51 is wound around the guide roller 46 as shown in FIG. 5 (e), and finally, as shown in FIG. 5 (f).
As shown in, the lid plate 2 closes the ceiling opening portion 1, and the storage ladder 3 is stored in the storage chamber R in a folded state. Further, when the cover plate 2 closes the ceiling opening 1, the fully closed limit switch 72 is turned off, and the drive of the forward / reverse rotation motor 41 is stopped.

B) At the time of extension The case of taking out the storage ladder 3 and extending it will be described with reference to FIGS. 5 and 6.

First, the open switch 71a is operated to drive the forward / reverse rotation motor 41 in the forward direction to feed the winding wire 44 from the winding drum 43. When the hoisting wire 44 is unwound, the cover plate 2 is rotated in the opening direction by its own weight and the weight of the storage ladder 3 as shown in FIG. At this time, the winding force of the slack prevention device 5 is the guide roller 4
6 acts in the extension direction. Then, as shown in FIG. 5C, the middle ladder 3b is rotated in the extension direction by the winding force and its own weight, and accordingly, the lower ladder 3c is also maintained in the hanging state, whereby the middle ladder 3b is maintained. It will rotate in the extension direction relative to. During the extension, the guide rollers 45 and 46 are wound around the hoisting wire 44 as illustrated. Then, Figure 5 (b) →
It extends as shown in (a), and the lower end of the lower ladder 3c lands. Further, when the storage ladder 3 is extended and the lower limit switch 73 is switched from the ON state to the OFF state, the internal timer of the controller 7 operates for a predetermined time T, and the winding wire 44 is continuously fed during that time. The state of the solid line in FIG. 5 (a) is changed to the state of a two-dot chain line. That is, the operating time of the timer is set to the time required for the hoisting wire 44 to be paid out in this manner. Then, when the predetermined time T elapses, the drive of the forward / reverse rotation motor 41 is stopped.

Next, the operation of the landing control wire 8 during this extension will be described with reference to FIG.

The storage ladder 3 extends as shown in FIGS. 6 (a) to 6 (e). At this time, each of the ladders 3a, 3
With the rotation of b and 3c in the extension direction, the landing control wire 8 linearly extends from the bent state.

Then, as shown in FIG. 6 (e), when the lower ladder 3c approaches the landing, the landing control wire 8 also becomes linear and tension is applied to pull the lower ladder 3c upward. That is, the lower ladder 3c
Will be urged to rotate in the extension direction. Therefore, the lower ladder 3c lands after extending, that is, the lower end of the lower ladder 3c does not extend after landing in a suspended state, and the lower end of the lower ladder 3c does not rub against the floor surface.

When the storage ladder 3 is taken out and extended as described above, the hoisting wire 44 is prevented from being loosened by the loosening prevention device 5, as shown in FIGS. However, since it is arranged along the side plate 30, the hoisting wire 44 is unlikely to interfere with the raising and lowering of the storage ladder 3.

Next, FIGS. 7 and 8 show an embodiment in which the lid plate 202 of the ceiling storage ladder device has a double structure. In this case, the lid frame 21 is connected to the opening frame 10 provided in the ceiling opening portion 1 by the hinge 22 so as to be rotatable in the vertical direction, and the lid body 26 is connected to the hinge 23 by the hinge 23.
The locking device 24, which is rotatably connected in the vertical direction by the above, and is attached to the lid body 26, is provided with a locking claw 25 that engages with the lid frame 21. The upper ladder 3a is attached to the lid frame 21.

Therefore, in the lid plate 202, normally, the lid frame 21 and the lid body 26 are integrated by the locking device 24, and the lid body 26 is opened and closed while being accompanied by the lid frame 21. In the event of an abnormality such as a failure of the device 4, the lock device 24 is released and only the lid body 26 is opened and closed, and the gap between the treads 32 of the storage ladder 3 is used to inspect and move in and out. You can

Here, a case will be described in which the winding drum 43 is manually driven to fold and extend the storage ladder 3 when an abnormality as described above occurs.

A manual handle can be inserted into the rotary shaft of the winding drum 43, and the forward / reverse rotation motor 4 can be used.
1 and the take-up drum 43 are, for example, the actual open sho-60-60.
The drive shown in No. 2781 is provided.
The operating force is not transmitted to the forward / reverse rotation motor 41 side when the manual handle is operated, and only the winding drum 43 can be rotated.

Although the embodiment of the present invention has been described above with reference to the drawings, the specific configuration is not limited to this embodiment.

For example, in the embodiment, the landing control wire is shown as the landing urging means, but if it urges the lower ladder to rotate in the extension direction at the time of landing, a winder for winding a spring or wire. You may use means, such as.
In such a case, when the lower ladder is folded as shown in the figure, the weight of the lower ladder overcomes and the lower ladder does not stand up. Elastic force (in the case of spring) and winding force (in the case of winder). Set to.

[0043]

As described above, according to the ceiling storage ladder device of the present invention, the tip end is fixed to the upper limit ladder and the middle is wound around the guide roller provided on the middle ladder, and the ceiling wire. A winding device provided with a winding mechanism capable of winding the base end of the winding wire and unwinding in the reverse direction is provided, and the storage ladder rotates the lower ladder in the extension direction when the storage ladder is extended. Since the landing urging means for dynamically urging is provided, the folding operation and the extension operation of the storage ladder can be automatically performed only by adding a simple mechanism, and the trouble of the operation can be eliminated. However, there is an effect that the work can be performed easily.

[Brief description of drawings]

FIG. 1 is a perspective view showing a ceiling storage ladder device according to an embodiment of the present invention as viewed from the right side.

FIG. 2 is a perspective view showing the apparatus of the embodiment as viewed from the left side.

FIG. 3 is a circuit diagram showing a controller of the embodiment apparatus.

FIG. 4 is a flowchart showing a control operation flow of a controller of the embodiment apparatus.

FIG. 5 is an operation explanatory view showing the operation of the hoisting device of the embodiment device.

FIG. 6 is an operation explanatory view showing the operation of the landing control wire of the embodiment apparatus.

FIG. 7 is an exploded perspective view showing an embodiment in which the lid plate of the embodiment device has a double structure.

8 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Ceiling Opening 2 Cover Plate 3 Storage Ladder 3a Upper Ladder 3b Middle Ladder 3c Lower Ladder 41 Forward / Reverse Motor (Winding Mechanism) 42 Reducer (Winding Mechanism) 43 Winding Drum (Winding Mechanism) 44 Winding Wire 45 Guide roller 46 Guide roller 8 Landing control wire (landing biasing means)

Claims (1)

[Claims] 1. A ceiling opening, which serves as a doorway to the back of the ceiling, is formed in the ceiling, and a lid plate for opening and closing the ceiling opening is rotatably attached to the ceiling opening. A ladder is attached, and this storage ladder includes an upper ladder, a middle ladder, and a lower ladder that are sized to allow access to and from the ceiling opening.The upper ladder is attached to the lid plate, and each ladder is in an extended state. While aligned in a straight line, the upper ladder and the middle ladder are rotatably connected to each other so that the upper ladder and the middle ladder come into contact with each other at the front sides and the middle ladder and the lower ladder come together at the back sides in the folded state. The tip of the wire is fixed, the above-ceiling is provided with a winding mechanism capable of winding up the base end side of the hoisting wire and unwinding it in the reverse direction, and the middle ladder has a storage ladder when the storage ladder is extended. , The middle part of the hoisting wire A ceiling roller which is provided with a guide roller which is passed around and is provided with landing urging means for urging the lower ladder to rotate in the extension direction when the storage ladder is extended. Ladder device.