JP3613780B2 - Fall prevention device for ceiling storage ladder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a ceiling storage ladder provided for entering and exiting a room such as an attic formed on the ceiling.
[0002]
[Prior art]
In general, in such a ceiling storage ladder, the storage posture is stored in the ceiling by winding and unwinding a suspended body such as a belt, wire, chain, etc. It is known that it can be transformed into a usage posture where people can climb up and down. And in this thing, it is necessary to consider so that a storage ladder may not fall, when a suspension body cut | disconnects in the said storage attitude | position.
Therefore, conventionally, when the storage ladder is in the storage posture, it is in a non-energized state (de-energized state) to lock the ladder in the storage posture to prevent the ladder from falling, and change between the storage posture and the use posture. In some cases, a lock mechanism using a solenoid that releases the lock in an excited state is provided.
[0003]
[Problems to be solved by the invention]
However, the conventional device has a problem that the lock mechanism uses a solenoid and the number of parts is large and the structure is complicated, and the lock cannot be released at the time of a power failure. In addition, the storage ladder bottom plate that is flush with the ceiling surface remains locked even if the tension is lost due to the suspended body being cut, etc. Therefore, there is a problem that it is difficult to determine whether there is an abnormality. Therefore, it is detected that the tension of the suspension body is lost due to the tension force of the suspension body being cut off, and based on this, the energization to the lock mechanism is regulated and the lock operation state is maintained. It is advisable to provide a mechanism, and in this case the unexpected fall of the ladder is avoided. However, when this is done, in order to perform maintenance for abnormalities such as disconnection, it is necessary to forcibly release the locked mechanism and lower the ladder. However, since the ceiling plate and the ladder bottom plate are flush with each other and there is no gap, it is not possible to perform unlocking work as it is, so it is necessary to provide a separate circuit for energizing the solenoid in the event of an abnormality, etc. However, there is a problem that it is not allowed to be complicated, and a troublesome and cumbersome work is forced, and there is a problem to be solved by the present invention.
[0004]
[Means for Solving the Problems]
The present invention has been made in order to solve these problems in view of the above-described circumstances, and a plurality of stages of ladders are connected in a telescopic manner, and the suspension body is unwound and wound in a tension state. To move the lower ladder to the upper ladder and store it in the ceiling, and to use the lower ladder from the upper ladder so that the lower ladder is pulled out from the upper ladder. In the ceiling storage ladder configured so that it can be transformed into the shape, the lower ladder on the storage posture is biased to the drawer side, and the lower ladder is directed to the drawer side due to the loss of tension of the suspension The urging means for projecting and the latching means for receiving and latching the projecting lower ladder to prevent the ladder from falling are configured.
With this configuration, when the tension is lost due to the suspension body being cut or the like, the lower ladder that protrudes by receiving the biasing force is received and locked by the locking means, and the ladder is prevented from falling. Thus, the ladder fall prevention device can be provided as a simple structure.
Further, in this structure, the locking means is set to receive and lock the lower ladder that has lowered its weight below the stowage posture. By doing so, the tension of the suspension body is lost. The lower ladder, which is received and locked, is in a state of being lowered from the stowed posture, and by looking at this, it can be confirmed that there is an abnormality in the tension of the suspension, and the subsequent countermeasures can be quickly taken Become.
Furthermore, the bottom cap of the lower ladder is effectively used for the member received and locked by the locking means of the lower ladder, so that the member can be shared.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. By the way, in the following description, when the ladder is hung from the floor surface to the ceiling, the ceiling side, that is, the side on which the ladder moves to be stored is the front side, the floor side, that is, the side on which the ladder is pulled out to the use posture. Is defined as the rear side and will be described below based on this. In the figure, reference numeral 1 denotes a bottom plate that is pivotally supported through a support shaft 3 in an opening formed by a four-round frame plate 2 including front, rear, left and right on a ceiling portion, and a ladder is provided on the upper surface of the bottom plate 1. 4 is incorporated. That is, the brackets 5 and 6 are fixed upright at both front and rear end portions of the upper surface of the bottom plate 1, and the front and rear end edges are slightly shorter than the front and rear end positions of the bottom plate 1 at the middle height position of the brackets 5 and 6. Thus, the left and right vertical bars 7a of the upper ladder 7 are incorporated in parallel with the bottom plate 1. Further, a handrail 8 is incorporated in the upper end positions of the brackets 5 and 6. The handrail 8 has a front edge positioned in front of the front edge of the bottom plate 1 and an electric motor M disposed below the front edge, and the rear edge substantially coincides with the rear edge of the upper ladder 7. It is set to length. Reference numeral 7 b denotes a step of the upper ladder 7.
Further, at the left and right side edges of the intermediate portion in the front-rear direction of the bottom plate 1, the base end portion of the restriction rod 1a is pivotally supported by the support shaft 1b. The tip portion of the restriction rod 1a is the ceiling portion. A positioning nut 2c is movably penetrating through positioning metal fittings 2a provided at both left and right edges of the opening frame plate 2, and a positioning nut 1c is screwed to the penetrating tip so as to be adjustable in position. As will be described later, when the bottom plate 1 is in the storage position that is flush with the ceiling surface, the regulating bar 1a penetrates the positioning fitting 2a at a position below the nut 1c, and the ladder 4 is used for a predetermined use. When it is in the posture, the positioning nut 1c is in contact with the positioning fitting 2a and is prevented from further lowering, and the downward swing of the bottom plate 1 is restricted, so that the posture is set to the use posture.
[0006]
On the other hand, 9 is a relay member arranged in the left and right inner cutouts 5a, 6a of the brackets 5, 6. The relay member 9 includes a side plate portion 9a sandwiched between the upper ladder 7 and the brackets 5, 6, and a handrail. 8, the guide roller 9 c provided on the side plate portion 9 a is guided and guided by the guide rail 7 c provided on the upper ladder vertical rail 7 a, so that the relay is relayed. The member 9 is configured to be movable in the longitudinal direction (front-rear direction) of the vertical rail 7a. When the ladder 4 is in the storage posture as described later by the guide operation, the relay member 9 has a storage posture state in which the front and rear end portions substantially coincide with the front and rear end positions of the upper ladder vertical rail 7a, and the rear end. The position protrudes rearward from the rear end portion of the vertical beam 7a, and the front end position is freely movable to the use posture state supported by the rear half portion of the vertical beam 7a.
[0007]
Next, reference numeral 10 denotes a lower ladder composed of left and right vertical rails 10a and a step 10b. The lower ladder 10 is between the left and right relay members 9, and the upper ladder 7 and the relay member upper plate portion 9b. Between them. The lower ladder 10 is moved in the front-rear direction by the guide roller 9d provided on the relay member side plate 9a and the guide roller 9d provided on the upper plate 9b being guided and guided by the guide rail 10d provided on the lower ladder 10. Although it is assembled freely, the front and rear end edges substantially coincide with the front and rear end edge positions of the handrail 8 in the storage posture state, and in the use posture state, the front end edge is located at the intermediate portion of the relay member 9; The uppermost step 10b is positioned so as to be separated from the lowermost step 7b of the upper ladder 7 with a step interval of approximately one step, and the rear edge is set to a position where it abuts against the floor surface. ing. A bottom cap 11 is fixed to the rear edge of the lower ladder 10, and a slip-preventing groove 11 a is formed on the floor contact surface of the bottom cap 11. In addition, the bottom cap 11 is set to be parallel to the floor surface in a state where the floor surface is in contact with the floor surface, so that in the storage posture state described later, the upper cap protrudes rearward and the lower side is set to an inclined posture retracted forward. It has become.
[0008]
Next, the extendable storage mechanism of the ladder 4 will be described. The electric motor M is housed in a casing 14 formed on the ceiling, and a first belt 13 is wound around the left and right pulleys 12 interlocked with an output shaft from the electric motor M. The first belt 13 is provided on the casing 14 and passes through an intermediate pulley 16 provided at the front end of the handrail 8 via a lower limit switch 15 that detects that the ladder 4 has reached the lower limit due to loss of belt tension. Guided into the slide 8, the tip is fixed to a moving pulley (moving pulley) 16a.
On the other hand, 17 is a second belt. One end of the second belt 17 is fixed to the rear end of the handrail 8 and the other end is fixed to the front end edge of the lower ladder 10. Is suspended by the moving pulley 16a. And as mentioned above, when the electric motor M is driven and the first belt 13 is wound up from the use posture state in which the rear end portion of the lower ladder 10 is in contact with the floor, the dynamic pulley 16a moves forward, As a result, the lower half of the second ladder 17 is wound up, the lower ladder 10 is raised, and the front edge of the lower ladder 10 comes into contact with the front edge of the relay member 9. The bottom plate 1 rises together with the lower ladder 10 and the bottom plate 1 rises in time with the lower ladder 10 and the relay member 9 reaching the substantially front end position, and the bottom plate 1 becomes substantially flush with the ceiling surface. The electric motor M is detected by the upper limit detection when the limit push 18 provided on the bottom plate 1 acts on the upper limit switch 19 provided on the casing 14 by being in the storage posture stored in the plate 2. Thus, the ladder 4 is set to be in the stowed posture, and in this stowed posture state, the first and second belts 13 and 17 are both in tension, and in this stowed posture, The upper ladder 7 is positioned on the upper side of the bottom plate 1 and the lower ladder 10 is overlapped (stacked, overlapped) on the upper side.
In addition, when the ladder 4 changes from the stowed posture state to the use posture state, the reverse operation is performed, but details thereof are omitted.
[0009]
Next, a fall prevention mechanism in which the present invention is implemented will be described. Among the brackets 5 and 6, an operating rod 20 is inserted in the rear (lower) bracket 6 so as to be movable in the front-rear direction. It is energized. The rear end of the operating rod 20 abuts against a receiving member 23 projecting from the rear end of the lower ladder 10 in the stowed position, so that the lower ladder 10 in the stowed position is attached to the ammunition 21. It is energized so that it will always protrude backward (reject) by receiving power.
On the other hand, the metal plate 22 is integrally fixed to the rear plate 2a of the frame plate 2 so as to be located below the bottom cap 11 in the storage position. When at least one of the first and second belts 13 and 17 is cut, the belt tension is lost and the bottom plate 1 is lowered by its own weight, while the lower ladder 10 The bottom cap 11 tilted with the lower side retracting forward as described above is abutted and locked to the stopper 22 as described above, and the ladder 4 including the bottom plate 1 is thereby received. It is set to prevent the entire fall.
[0010]
As described above, the ladder 4 is configured such that the ladder 4 and the lower ladder 10 are stored in the ceiling based on the winding and unwinding of the first belt 13 accompanying the forward / reverse driving of the electric motor M as described above. The rear end is transformed into a use posture installed on the floor, but when the belt is cut in the stowed posture state, the lower ladder 10 receives the urging force of the ammunition 21 and jumps out backward, As a result, the bottom cap 11 is abutted and locked to the stopper member 22 to prevent the ladder 4 from falling.
[0011]
In addition, in this case, the position of the stopper 22 is located below the bottom cap 11 and is received and locked at a position where the ladder 4 has fallen a little due to its own weight. Therefore, the bottom plate 1 is inclined slightly from the ceiling surface. By visually recognizing that the belt is hanging and not flush with each other, it can be recognized as an abnormal situation in which the tension of the belts 13 and 17 has been lost, and there is an advantage that quick maintenance can be handled.
When the maintenance is performed, the bottom plate 1 is slightly inclined and opened with respect to the frame plate 2, so that the protruding lower ladder 10 can be used as an urging force by inserting a hand from here. The ladder 4 can be easily unlocked by pushing against it and releasing the locking of the locking cap 22 of the bottom cap 11. In this state, the ladder 4 is gently pulled down to the working posture and the belt 13 is cut. , 17 can be maintained, and maintenance can be improved.
Furthermore, the bottom cap 11 received and locked by the stopper 22 is a stopper that the upper 4 protrudes rearward and the lower side recedes forward in the storage posture state, so that the ladder 4 falls. Therefore, the fall prevention function is more reliable. In addition, since the bottom cap 11 is formed with a slip stopper, the receiving and locking function can be further improved.
[0012]
Of course, the present invention is not limited to the above-described embodiment, and the ceiling storage ladder can be implemented by a manual type as well as an electric type. Further, the storage ladder is not a two-stage type, and a multi-stage unit such as a three-stage or a four-stage can be implemented in the same manner. In addition, the locking means does not abut against the bottom cap, but is set to be locked to the lower edge of the lower ladder that protrudes by receiving an urging force, or a member that is separately received and locked by the locking means is attached. It can also be
[Brief description of the drawings]
FIG. 1 is a side view of a storage posture state in which a part of a ceiling storage ladder is cut away. It is.
FIG. 2 is a front sectional view showing a storage posture state of the ceiling storage ladder.
FIG. 3 is a partially cutaway side view showing a use posture state of the ceiling storage ladder.
FIG. 4 is a front view showing a use posture state of the ceiling storage ladder.
FIG. 5 is a side view showing a state where the ceiling storage ladder is prevented from falling.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bottom plate 4 Ladder 7 Upper stage ladder 10 Lower stage ladder 11 Bottom cap 13 First belt 17 Second belt 21 Bullet 22 Locking bracket

Claims (3)

A multi-stage ladder that can be extended and retracted, and the suspension stage is unwound and unwound to move the lower ladder to the upper ladder so that it can be stored on the ceiling. In a ceiling storage ladder that is configured so that the ladder can be transformed from the ceiling to the floor surface by pulling it out from the upper ladder, the lower ladder on the drawer is attached to the drawer side. Energizing means for projecting the lower stage ladder toward the drawer side in response to loss of tension of the suspension, and latching means for receiving and locking the projecting lower stage ladder to prevent the ladder from falling And a fall prevention device for a ceiling storage ladder. The ceiling storage ladder fall prevention device according to claim 1, wherein the locking means is configured to receive and lock the lower ladder whose weight is lowered below the storage posture. 3. The fall prevention device for a ceiling storage ladder according to claim 1, wherein the member received and locked by the locking means of the lower ladder is the bottom cap of the lower ladder.

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