JP2003049552A - Retractable tiered stool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retractable tiered stool which can be positively deformed to a desired tiered mode or a retracted mode. SOLUTION: According to the retractable tiered stool, a plurality of tier stools 1, 2, 3, 4 which are stacked and mounted on each other are sequentially linked to each other in a drawable or retractable manner, and a wrap-connecting transmission bodies 16 each having a starting end 16a thereof fixed to the rear of the undermost tier stool 1, are wrap-connected to rotary wheels 17, 18, 19 arranged at the front and rear of the tier stools 1, 2, 3, 4 in a zigzag manner. The rear rotary wheels 19 of the uppermost tier stool 4 are arranged behind the rear rotary wheels 18 of each of the tier stools 1, 2, 3. Then, the wrap-connecting bodies 16 wrap-connected to the rear rotary wheels 19 of the uppermost tier stool 4 is wrap-connected to rotary wheels 20 separately arranged below the uppermost tier stool 4, and tier interlocking means W each having a terminal end 16b of the wrap-connecting body 16 fixed to the undermost tier stool 1, are arranged on both right and left ends of each tier stool 1, 2, 3, 4. Further, the tier interlocking means W are operated in synchronization with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable stair-stand which is a chorus stand, a group shooting stand, or a pedestal where a chair is installed.

[0002]

2. Description of the Related Art Conventionally, this type of staircase is composed of a plurality of stacked stairs connected in sequence so that they can be sequentially withdrawn or pushed in, and the withdrawal or push-in operation of the stage can be performed manually or automatically. Has been done. The uppermost tier is installed on the floor so that the lower tier can be housed, and the front tier has an opening for the lower tier to enter and exit. The traveling legs are provided, and the other steps are provided with rollers for rolling on the tread plate on the upper surface of the lower step at the front end and traveling legs for traveling on the floor at the rear end. And
At the rear end of each stage except the top stage, there is a member that locks the kick in at the front end of the upper stage when the stage is pulled out. The stopper member locks the risers of the upper tiers so that the tiers adjacent to each other in the vertical direction are connected to each other. When closing the terrace,
When the rear end of the step plate of the lower stage is brought into contact with the traveling leg of the upper stage, the vertically adjacent stages are connected to each other. Further, in the case where the drawer or push-in is automated, motor-driven traveling wheels are attached to the lowermost stage of the staircase with the above configuration, and the lowermost stage is moved forward and backward by the forward and reverse rotations of the traveling wheels. By pulling out or pushing in the respective tiers connected in the same manner, it is transformed into a staircase form or a storage form.

[0003]

However, in the staircase with the above configuration, the load of the upper staircase is applied to the lower staircase regardless of the storage form or the staircase form, and the load is Since the lower one is larger, even if the roller that rolls the tread of the lower tier is attached to the upper tier, it cannot always be drawn or pushed in sequentially from the lowest tier, and the drawer or push-in process is the same as the upper tier. In the lower row, they behave differently and irregularly, and did not always go straight back and forth. For this reason, in the storage form, the kicks of each tier are not evenly distributed on the same vertical surface, and rattles up, down, left, and right.Adjust each tier so that the kicks of each tier are aligned on the same vertical surface. In addition, even in the staircase form, the tread of each step (the set drawer length of the tread) is not constant in the width direction, and the kick of each step contacts the locking member of the step below it. I had to adjust the tread like this. Therefore, according to the present invention, each stage can be surely deformed into a desired staircase shape with a drawer length (tread) uniformly set in the width direction, and the risers of each stage are arranged on the same vertical surface. An object of the present invention is to provide a retractable stair pedestal that can be surely transformed into a desired storage form and can be surely drawn out or pushed in sequentially from the lowermost stage.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention is a stowage stair pedestal in which a plurality of stacked tiers are sequentially connected so as to be freely drawn out or pushed in, and the lowest tier. Zigzag the winding transmissions that start from the rear of the platform around the rotating wheels arranged in front of and behind each stage, and the rear rotating vehicle of the uppermost stage is behind the rear rotating vehicle of each stage. Place the winding transmission body wound around the rear rotating wheel of the uppermost stage on the rotating wheel separately placed under the uppermost stage, and the end of the winding transmission body at the bottom stage. By disposing the stage interlocking means fixed to at least on the left and right in the width direction of each stage, and interlocking each stage interlocking means, or between the stage interlocking means and a vertically adjacent stage. , A linear motion plan in which the upper stage guides and supports the lower stage along its reciprocating linear trajectory By providing a means, in tandem each stage platform by a series of wrapping connector body, each stage platform is to straight stable forward and backward movement when the drawer or closet. In addition, between the vertically adjacent steps, one end facing each other before and after a link of the same length that intersects in an X shape with the intermediate portion as a fulcrum is pivotally attached to each step and the other end. Is slidably mounted in the width direction of each stage so that each stage is linked by links so as to move back and forth in parallel, and each stage is moved straight forward and backward when it is pulled out or pushed in.
In addition, each stage except the lowest stage and the highest stage is prevented from retreating and the lower stage is When the storage is completed in the lower part of the upper tier, the forward push-in means designed to release the restraint and each pedestal are stored in the lower tier of the uppermost tier so that the riser is located on the same vertical plane. In the stored form, forward movement of each stage except the lowermost stage and the uppermost stage is prevented, and the forward withdrawing means configured to release the inhibition when the lower stage is completely withdrawn. By providing the above, it is possible to surely pull out or push in sequentially from the lowermost stage, and solve the above problems.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The main body A of the retractable staircase shown in the figure is composed of a plurality of stacked tiers (4 tiers in the illustrated example) 1, 2, 3,
4 is provided so that it can be pulled out or pushed in freely. Each of the steps 1, 2, 3, 4 has a horizontally long rectangular tread plate T1, T2, T3, T4 including a tread surface L on its upper surface, and the tread plates T1, T2,
A riser K having the same height is formed so as to hang down from the front ends of T3 and T4. Each stage 1, 2, 3 except the top stage 4
Sets the depths and widths of the treads T1, T2, T3 to the same length, and the uppermost stage 4 has the depth and width of the tread T4 set longer than that of each stage 1, 2, 3. . Tread T1,
T2, T3, and T4 are formed by appropriately arranging and reinforcing square pipes on the lower surface thereof, and a plurality of leg portions F1 and R1 with casters running on the floor G at the front and rear ends of the tread plate T1. It is installed vertically, and the floor surface G is attached to the rear end of the lower part of the treads T2 and T3.
A plurality of leg portions R2, R3 with casters running down the road are hung vertically, and treads T1, T2 of the lower decks 1, 2 are provided at the front end.
A plurality of caster legs F2 and F3 that roll on the top are provided vertically. Further, in the lower part of the tread T4, front and rear leg parts f4 and R4 which are grounded to the floor surface G are vertically provided at four corners thereof.
A pair of left and right intermediate leg portions CR4 grounding to the floor surface G is vertically installed between R4, and the number of the leg portions is appropriately set according to the width of the stairs grounding to the floor surface G between the rear leg portions R4 (four in the illustrated example). The rear supporting leg r4 is vertically provided, and a pair of left and right caster-side legs F4 for rolling the tread plate T3 of the lower stage 3 is vertically provided at an intermediate portion of the front and rear legs F4. Front and rear legs F of the steps 1, 2, and 3
1, F2, F3, R1, R2, R3 are as shown in the illustrated example.
An appropriate number (four in the illustrated example) is provided according to the width of the stage, and the rear legs R1, R2, and R3 are arranged so as not to collide with each other due to the forward and backward movement of the stages 1, 2, and 3. There is.

In the arrangement of the rear legs R1, R2, R3, the uppermost stage 4 lower part is arranged so that the risers K of the respective stages 1, 2, 3, 4 are arranged on the same vertical plane. In a state in which each of the terraces 1, 2, and 3 is stored (hereinafter, simply referred to as a storage form), the rear legs R1, R2, and R3 of each of the terraces 1, 2, and 3 are on the same line in the left-right direction. They are arranged side by side, that is, the lower ones are arranged on the inner side. Therefore, the lowermost stage 1
In the tread plate T1, the notch 5 is formed corresponding to the rear leg parts R2 and R3 which are arranged in parallel with the rear leg part R1 in the stored form, and the tread plate T2 of the stage 2 is also arranged in parallel with the rear leg part R2. The notch 6 is formed corresponding to the rear leg R3. Therefore,
When each stair 1, 2, 3 changes from a stair-like state (hereinafter simply referred to as stair form) in which the same tread L protrudes from the riser K of the upper stage 2, 3, 4 to a storage form , Notches 5 and 6 of the steps 1 and 2 and rear legs R2 and R3 of the steps 2 and 3
By engaging with each other, the main body A is configured so that it can be sequentially pushed in from the lowermost stage (see FIGS. 5 and 6).
In the present embodiment, the legs f4 and CR of the uppermost stage 4 are
Although casters are not provided on 4, R4, and r4, casters with stoppers may be provided to make the main body A movable, and in this case, when pulling out and pushing in the steps 1, 2, and 3 , Legs f4, CR4, R4, r4
The casters are prevented from rotating by the stoppers attached to the casters so that the uppermost stage 4 is not inadvertently moved, and each stage 1, 2, 3 can be moved back and forth without any trouble.

In the main body A, in order to sequentially connect the respective trays 1, 2, 3 so as to be freely drawn out, the trays 1, 2, 3, 4 which are vertically adjacent to each other are connected to the trays 1, 2, 3 is provided with stopper means S corresponding to the set same withdrawal length (treading surface) L and interlocking with each other. This stopper means S is
The locking portion 7 arranged so as to project upward to the left and right of the rear end portions of the lower tiers 1, 2, 3 and the kicking K of the lower tiers 1, 2, 3 to the upper tiers 2, 3, 4 When the set tread L is protruded, the upper and lower pedestals 2 are set so as to stop the left and right engaging portions 7.
It is composed of a pair of left and right stopper plates 8 provided at 3 and 4. The locking portion 7 has treads T1, T2, T at the rear ends of the steps 1, 2, and 3.
3 is a bolt that protrudes upward from 3 and is threadedly screwed from the back surface to a support plate that is disposed parallel to the riser K, and the tip of the bolt corresponds to the rear portion of the casters of the front leg portions F2, F3, and F4. Similarly, it is directed to the stopper plate 8 arranged in parallel with the riser K, and the tread surface L of each stage 1, 2 and 3 can be adjusted by adjusting the protruding length of the bolt from the front surface of the support plate. is doing. The stopper plates 8 provided on the pedestals 2, 3 and 4 are on the same vertical line in the stored form, and the stopper plates 8 provided on the tiers 2 and 3 are the front leg portions provided near the left and right ends. A stop plate 8 placed on the rear of the casters of F2 and F3 and provided on the stage 4
Is formed so as to hang down toward the left and right ends of the stage 4, and the stages 2, 3,
4, so that the locking portion 7 corresponds to the stopper plate 8 of 4,
It is provided in a few. When the lowermost stage 1 is pulled out by the stopper means S in the stored form, the stopper plate 8 of the upper stage 2 is stopped when the tread surface L on which the locking portion 7 of the stage 1 is set protrudes. The table 2 is pulled out, the table 2 is pulled out similarly, the table 3 is drawn out, and the locking portion 7 of the table 3 is locked to the stopper plate 8 of the uppermost table 4, Each of the steps 1, 2 and 3 has a stair form in which the same tread surface L is projected from the rise K of the upper steps 2, 3 and 4.

The main body A having the above structure is equipped with various means P, W, X and Y. Linear motion guide means P
Between the upper and lower adjacent steps 1, 2, 3 and 4, the upper steps 2, 3 and 4 move the lower steps 1, 2 and 3 to and from their reciprocating linear tracks (steps 1, 2 and 3). It is configured to guide and support along a straight forward / backward trajectory in the front-back direction. That is, the linear motion guide means P includes a pair of left and right guide rails 9 provided on the upper tiers 2, 3, and 4 parallel to the track, and lower tiers 1, 2 so as to slide on the guide rails 9. 3 and a guide car 10 provided in The guide rail 9 is formed by arranging a recumbent rectangular pipe of a predetermined length so as to extend rearward from the upper rear surface of the stopper plates 8 provided on the left and right of the upper tiers 2, 3, and 4. ,
One side surface (inner side surface) of the rectangular pipe facing each other on the left and right sides is formed as a sliding surface 9a. The guide wheel 10 is formed in a substantially columnar shape, and has a support shaft 11 projecting upward from the rear ends of the lower stage stands 1, 2, and 3 so that its peripheral surface slidably abuts on the sliding surface 9a. It is attached so that it can rotate freely. The guide rails 9 fixed to the left and right of the upper tiers 2, 3 and 4 at a predetermined interval and the lower tiers 1 and 2 so as to slide along the sliding surfaces 9a of the guide rails 9. By the guide wheels 10 arranged on the left and right sides of 3, the widthwise movements of the tiers 1, 2, 3 are restricted,
It is set so that the two and three move straight forward and backward along the above trajectory.

Next, another embodiment of the linear motion guide means P will be described with reference to FIGS. This linear motion guide means P
Is a link of the same length that crosses between the vertically adjacent steps 1, 2, 3, and 4 in an X-shape with the intermediate part as a fulcrum.
One end 12a, 13a facing each other before and after 12, 13 is provided on each stage 1,
In addition to being pivotally attached to 2, 3 and 4, the other ends 12b and 13b are mounted so as to be slidable in the width direction of each stage 1, 2, 3 and 4. A linear rail 14 is provided between the front end portions above the pair of rear leg portions R1, R2, R3 located in the middle of the lower stage bases 1, 2, 3.
Is installed horizontally. Also, between the rear ends of the pair of rear legs R2 and R3 located in the middle of the upper stages 2 and 3, and between the front ends of the rear support legs r4 of the stage 4, respectively, the lower stage is A linear rail 15 that is parallel to the linear rails 14 provided on the first, second and third lines is installed. And a pair of front and rear linear rails
On one side of 14 and 15 (left side in plan view), one ends 12a and 13a of the links 12 and 13 facing each other are pivotally attached,
The other ends 12b and 13b are slidably mounted on the other side of the linear rails 14 and 15 (right side in plan view). The lengths of the links 12, 13 and the pivotal positions of the ends 12a, 13a and other conditions are set corresponding to the storage form of the steps 1, 2, 3 and the set tread L, Since the adjacent upper and lower tiers 1, 2, 3, 4 are linked by the links 12, 13 as described above, the lower tiers 1, 2, 3 become the upper tiers 2, 3,
4 is always parallel, that is, it moves straight back and forth along a reciprocating linear trajectory.

The stage interlocking means W is constructed such that the stage bases 1, 2, 3, 4 are interlocked to move forward and backward. In the figure, the stage interlocking means W is the stage bases 1, 2 3, 4 (main body A) are provided on the left and right in the width direction, and the guide rail 9 and the guide car 10 are provided.
A linear motion guide means P consisting of
A linear motion guide means P consisting of 12 and 13 may be installed side by side,
Even if these linear motion guide means P are not provided side by side, if each means W is provided so as to interlock with each other at least on the left and right sides of the main body A, then each stage 1, 2, 3, 4 follows a reciprocating linear trajectory. Move forward and backward. In addition, at a position where there is no hindrance to the operation of the linear motion guide means P (particularly, the one constituted by the links 12 and 13),
A single stage interlocking device W may be provided, and even in this case,
It moves back and forth along a reciprocating straight track (not shown). This stage interlocking means W is provided on rotating wheels 17, 18, 19 in which a winding transmission body 16 which emits a starting end 16a from the rear part of the bottom stage 1 is arranged before and after each stage 1, 2, 3, 4. Winding in a zigzag manner, the rotary wheel 19 behind the uppermost stage 4 has the other stages 1, 2,
3 is arranged behind the rotary wheel 18 on the rear side of 3 and the winding transmission body 16 wound around the rear rotary wheel 19 of the uppermost stage 4 is placed on the lower wheel 20 of the upper stage 4. Around it,
The end 16b of the winding transmission member 16 is fixed to the lowest stage 1. The winding transmission body 16 is preferably a chain, but may be a belt or rope, and the rotary wheels 17, 18, 19, 20 are
A sprocket, a belt wheel, or a groove wheel for a rope is selectively used according to the specifications of the winding transmission body 16. In this embodiment, the winding transmission member 16 will be described as a chain, and the rotating wheels 17, 18, 19, 20 will be described as a sprocket. The starting end 16a and the terminating end 16b of the winding transmission member 16 are fixed to a substrate 21 arranged parallel to the kick K near the rear end of the lowermost stage 1 and the starting end 16a is fixed to the substrate 21. Further, the winding transmission body 16 is fixed to the substrate 21 by being connected to a spring device 22 having a coil spring therein so as to always tension the winding transmission body 16. A pair of upper and lower rotating wheels 18a are provided at the rear ends of the respective step stands 1, 2, 3 except the uppermost step stand 4.
18b is rotatably provided, and the lower rotating wheel 18b has treads T1, T
2, T3 downward, upper rotating wheel 18a is tread 1, T2, T3
Arranged on the upper side, each stage 2 except the lowest stage 1
A front rotary wheel 17 is rotatably provided above the upper rotary wheel 18a below the treads T2, T3, T4 at the front end portions of the third and fourth front wheels. They are arranged so as to be inconsistent with each other, and the axle distances of the front and rear rotating wheels 17 and the rear rotating wheel 18 are set to be constant in the stored form.
The rear rotating wheel 18 (18a, 18b) is shown as a pair of upper and lower wheels having a smaller diameter than the front rotating wheel 17, but the rotating wheel 18 having substantially the same diameter as the front rotating wheel 17 may be used alone. Of course, even in this case, the front and rear rotating wheels 17 and 18 are arranged in a staggered manner at the top and bottom. The rear rotary wheel 19 of the uppermost stage 4 is rotatably disposed above the rear support leg r4, which is the rearmost end of the main body A, and is wound between the front and rear rotary wheels 17 and 19 of the stage 4. The axial position of the rear rotary wheel 19 is set so that the wound transmission bodies 16 are arranged on the same horizontal plane, and the rear support leg portion r4.
A guide wheel 20 is rotatably arranged at a position corresponding to the base plate 21 below. In the rear support leg r4 of the stage 4, a tension rotary wheel 23 for tensioning the winding transmission body 16 is rotatably arranged between the rear rotary wheel 19 and the guide rotary wheel 20. As mentioned above, each stage 1, 2,
The front and rear rotary wheels 17, 18 and 19 provided on the third and fourth winding transmission bodies that start from the rear end (substrate 21) of the lowest stage 1 (base 21).
16 is wound back and forth in a zigzag manner and arranged so that the end 16a of the winding transmission member 16 reaches the substrate 21 from the rear rotary wheel 19 of the uppermost stage 4 through the tension rotary wheel 23 and the guide rotary wheel 20. is doing. Further, in the stage 4, the rear rotary wheel 19 and the guide rotary wheel 20 provided on the left and right of the rear leg portion R4 are configured to rotate coaxially and in the same manner. The platform interlocking means W is configured to interlock. Then, the stage interlocking means W uses an electric motor that can rotate forward and backward as a drive source M, and a drive rotating wheel M1 fixed to the drive shaft thereof to an endless chain to a driven rotating wheel M2 fixed to the shaft of the guide rotating wheel 20. It is automated by winding C around it. In the present embodiment, the automatic stage interlocking means W is shown. However, each stage 1 is manually operated without providing the drive source M, the drive and driven rotary wheels M1 and M2, and the like. You may make it operate | moving pulling out and pushing in 2,3,4.

The forward push-in means X is in the above-mentioned state when the drawers 2 and 3 except the lowermost and uppermost tiers 1 and 4 are in the drawing-out completed state in which the drawn-out length (tread surface) L is set. The lower tiers 1 and 2 are arranged such that the backward movement of the tiers 2 and 3 is suppressed and the kicking K is located on the same vertical plane.
The above-mentioned restraint is released in the state in which it is completely stored in the lower part of 3. On the outer surfaces of the left and right rear legs R2 and R3 of the middle tiers 2 and 3, at positions substantially opposite to the risers K of the lower tiers 1 and 2,
The front end 24a pivotally supports the fulcrum 24c of the swing rod 24 located below the rear end 24b and the fulcrum 24c. This rocking rod 24
Has a substantially triangular plate shape in which one of the inner angles is an obtuse angle, the apex having an obtuse angle as a fulcrum 24c, and the other apexes as a front end 24a and a rear end 24b, respectively, from the fulcrum 24c to the front end 24c.
The distance to a is set shorter than the distance from the fulcrum to the rear end portion 24b, and the rear end portion 24b is fixed to the tip of a shaft protruding from the center of a disc 25 having a predetermined diameter. The roller 26 is loosely fitted in the roller 26. Further, the rear leg R3 and the intermediate leg CR4 of the upper tiers 3 and 4 are provided with a long track 27 for supporting the rear end 24b (roller 26) of the swing rod 24 above the fulcrum 24c. It is provided. The track 27 is slightly smaller than the roller 26, and is horizontally arranged slightly above the fulcrum 24c of the rocking rod 24. At the front end of the track 27, when the middle tiers 2 and 3 have been pulled out, A hook-shaped paragraph 28 in which the roller 26 of the moving rod 24 is located is provided as a recess. Therefore, when the drawers 2 and 3 are completely drawn out, the rollers 26 of the rocking rods 24 provided on these are prevented from moving backward by the rising portion 28a of the paragraph 28 so that the drawers 2 and 3 cannot be retracted. It is designed to maintain the condition. Further, the front end portion 24a of the swing rod 24 is set so as to project forward from each of the rear leg portions R2 and R3 in the drawing-out completed state. Outside the front ends of the lower pedestals 1 and 2 left and right rear legs R1 and R2, the rear pedestals R2 and R are stored in a state where the tiers 1 and 2 are completely stored in the middle tiers 2 and 3 below.
A hooking / unhooking piece 29 for swinging and holding the roller 26 of the swinging rod 24 is provided above the track 27 by pressing the front end portion 24a of the swinging rod 24 projecting forward from each of the three. Therefore, in the state in which the steps 1 and 2 are completely stored in the lower parts of the steps 2 and 3, the roller 26 of the rocking rod 24 of the steps 2 and 3 is located above the track 27, and The restraint of the backward movement of the tables 2 and 3 is released,
2 and 3 move backward from the bottom.

The forward withdrawing means Y is
The forward movement of each of the tiers 2 and 3 except the lowest tier and the highest tier 1 and 4 is restrained, and the restraint of the upper tiers 2 and 3 is restrained when the lower tiers 1 and 2 are completely drawn out. The forward pulling means Y is described in detail below.
In each of the steps 2 and 3 except the steps 1 and 4 of the uppermost step and the lowermost step, a bracket 30 is formed so as to hang down to the rear left and right below the treads T2 and T3, and the bracket 30 swings up and down with a fulcrum as a pivot 31a. The lever rod 31 is attached. This lever rod 31
Has a rear end protruding from the rear ends of the steps 2 and 3,
At the rear end of the lever rod 31, there is provided a hook-shaped hooking portion 32 that rises upward, and a backward descending sloped portion 33 that is continuous with the hooking portion 32, and the lever rod 31 is provided at the front end. In addition to providing a convex portion 34 that is substantially perpendicular to the axis of, the engaging rod 35 that is parallel to the pivot 31a is provided at the lower portion of the convex portion 34, and the lever rod 31 is in a state where no external force is applied, It is set to be horizontal by a stopper 36 of a lever rod 31 arranged at the rear end of the bracket 30. Support plate 37 installed between the rear support legs r4 of the uppermost stage 4
A slanting part 33 is slidably contacted with the locking part 38, and a locking part 38 with which the hooking part 32 engages from below is provided on the front side. The locking portion 38 is composed of a short rod interposed between the ends of a pair of left and right strip-shaped brackets 39 projecting forward from the supporting plate 37 corresponding to each lever rod 31, and is hooked to the locking portion 38 in the stored form. The stopper 32 is engaged to prevent forward movement of the steps 2 and 3, and the hook 32 to the lock 38 is stopped.
The engagement of is slidably brought into contact with the locking portion 38 by the slanted portion 33 of the lever rod 31 which is in the horizontal state when the stepped bases 2 and 3 are retracted so as to be deformed into the stored form, and the slanted portion 33 is pressed downward. When the stop portion 32 corresponds to the lock portion 38, the lock portion 32 is engaged with the lock portion 38 from below, and then the lever rod 31 becomes horizontal, and the state in which the hook portion 32 is engaged with the lock portion 38 is maintained. On the rear upper surfaces of the treads T1 and T2 of the lower pedestals 1 and 2, there is provided a hanging body 40 that presses and holds the engaging rod 35 of the convex portion 34 of the lever lever 31 upward in the completed drawing state.
The hanging body 40 is formed of a substantially trapezoidal plate provided with a front descending slope 40a and a horizontal part 40b continuous from the highest part of the slope 40a. ,
When the lower portion of the slanted portion 40a of the hanging body 40 on the lower stage 1 or 2 comes into contact with the engaging rod 35 of the upper stage 2 or 3, the engaging rod 35 slides along the slanted portion 40a. The lower tiers 1 and 2 can move forward without any trouble until the set tread L protrudes from the riser K of the upper tiers 2 and 3, and the engaging rod 35 contacts below the inclined portion 40a. The latching portion 32 of the lever rod 31 is gradually pushed down until the engaging rod 35 is positioned on the horizontal portion 40b until the lower stage bases 1 and 2 are completely drawn out until it moves to the horizontal portion 40b. The engagement of the hooking portion 32 with the locking portion 38 is completely released, and that state is maintained.

Next, the operation of the main body A will be described. In the storage form, the trays 1, 2, 3 are sequentially stacked and stored under the uppermost tray 4, and the risers K of the trays 1, 2, 3, 4 are vertically arranged on the same vertical plane. Arranged, and the steps 1, 2,
The rear leg portions R1, R2, R3 of 3 are arranged in parallel on the same line in the left-right direction, that is, the rear leg portions R2, R3 are arranged adjacent to the rear leg portion R1 in the cutout 5 of the tread plate T1, and the cutout portion of the tread plate T2 is arranged. 6, a rear leg portion R3 is arranged adjacent to the rear leg portion R2. In such a state, the lever rod provided on the steps 2 and 3
The latching part 32 of 31 is engaged with the locking part 38 so that the lever rod 31 is maintained in its horizontal state, and the steps 2 and 3 are the locking parts of the locking part 32.
Forward movement is restrained by engagement with 38. Further, the rocking rods 24 provided on the stage bases 2 and 3 are pressed at their front end portions 24a by the hanging pieces 29 provided on the lower stage bases 1 and 2, and the rear end portions 24b.
The roller 26 is held above the track 27.

The drive source M is operated from the above-mentioned stored form to rotate the guide rotary wheel 20 clockwise in FIG. 14, and the end 16b of the winding transmission member 16 is fed forward. By this feeding, the respective rotary wheels 17, 18, 19 rotate in the same direction, but since the forward movements of the stage bases 2 and 3 are suppressed as described above, the end 16b is extended by the length of the forward direction. The winding transmission body 16 between the front rotary wheel 17 of the platform 2 and the rear rotary wheel 18 of the lowest stage 1 is shortened, and only the platform 1 moves forward. At this time, the stage 1 is wound around the stage transmission means 16 of the stage interlocking means W that is interlocked on the left and right.
Since the left and right movement distances are the same, the vehicle moves straight along a reciprocating linear trajectory. Thus, when the stage 1 moves forward, the slanted portion 40a of the hanging body 40 provided on the stage 1
The engaging rod 35 of the stage 2 contacts the engaging rod 35, and the engaging rod 35 slides on the inclined portion 40a to disengage the latching portion 32 of the lever rod 31 of the stage 2 from the engagement portion 38 ( Gently rock downward). On the other hand, terrace 1
Since the hook-and-hook piece 29 is separated from the front end portion 24a of the swing rod 24 of the stage 2 to release the above-mentioned pressing, the roller 26 has its orbit.
27 Ground on top. Then, as the stage 1 moves forward, its locking portion 7
When the abutment plate 8 comes into contact with the stopper plate 8 of the stage 2, the stage 1 projects from the rise K of the stage 2 to the set tread surface L, and the pull-out state is completed. At the same time, the engaging rod 35 of the stage 2 is located on the horizontal portion 40b of the hanging body 40 of the stage 1, and the hooking portion 32 is connected to the locking portion 38.
Since it is separated below, and the stage 2 can be moved forward,
Along with the stage 1 which has been pulled out, the stage 2 goes straight forward.
When the stage 2 moves forward, the forward pusher means X, like the stage 1,
And each part of the forward drawing means Y operates similarly. Terrace 1
The difference is that as the stage 2 moves forward, the roller 26 of the rocking rod 24 provided on the stage 2 travels forward on the track 27, and the stage 2 is set from the kick K of the stage 2 to the tread L. The roller 26 falls into the paragraph 28 at the front end of the track 27 when the roller is projected and the drawing is completed. Then, when the stage 3 moves forward similarly to the stage 2, and when the set tread surface L is projected from the rise K of the uppermost stage 4, the drive source M is stopped and the main body A excluding the uppermost stage. The stepped surface L of the step is completely deformed into a constant step shape (step shape). Further, since the rollers 26 of the rocking rods 24 provided on the stepped stands 2 and 3 are located in the paragraph 28 at the front end of the track 27 and the rising portions 28a of the paragraphs 28 prevent the rollers 26 from retracting, the retracting movement is not possible. It is in a restrained state.

In order to transform the staircase type main body A into the housed type, the drive source M is rotated in the opposite direction to pull back the end 16b of the winding transmission member 16 rearward. As described above, only the bottommost stage 1 can be retracted, so the stage 1
Retreat, and during this retreat as well as forward, it moves straight along the reciprocating linear trajectory by the wrapping transmission body 16 that is interlocked on the left and right, and during the retreat, the unloading body 40 in the reverse order to the above When the lever rod 31 is separated from the engaging rod 35 of the stage 2 on the horizontal portion 40b, the lever rod 31 returns to the horizontal state. In addition, the kick K of the step 1 is located on the same vertical plane as the kick K of the step 2, and the rear leg R2 of the step 2 is located in the notch 5 of the tread T1 so that the rear leg of the step 1 is located. When the R1 and the R1 are arranged side by side, the stage 1 is completely stored under the stage 2. At this time, the hanging piece 29 of the stage 1 presses the front end portion 24a of the swing rod 24, and the paragraph 28
The upper roller 26 is positioned above the track 27, and the backward restraint of the stage 2 is released. Subsequently, the stage 1 is pulled back by the winding transmission member 16, but the stage 2 is in a retractable state and the rear leg portion R2 of the stage 2 is engaged by the notch 5, so that the stage 2 is engaged. The two are retracted together while being stacked on the stage 1. In the same procedure, the risers K of the steps 1 and 2 are located on the same vertical plane as the riser K of the stage 3 and the rear leg R3 of the stage 3 is provided with the notches 5 of the treads T1 and T2. , 6 and the rear legs R1, R2, R3 of the respective pedestals 1, 2, 3 are arranged side by side, the storage of the pedestals 1, 2 under the pedestal 3 is completed. Then, similarly to the above, the backward restraint of the stage 3 is released, and the rear legs R2 and R3 of the stages 2 and 3 are retracted while being engaged with the notches 5, so that the stages 1 and 2,
3 is stored under the uppermost stage 4. When the stacks 1, 2 and 3 stacked on the stack 4 are stored, the stacks 2 and 3 are stored.
When the slanted portion 33 of the lever rod 31 of the contact lever comes into contact with the locking portion 38, the latching portion 32 of the lever rod 31 in the horizontal state is swung downward, and the kicking K of each of the decks 1, 2, 3 is stepped. In the storage completed state, which is positioned on the same vertical plane as the kicking K of the table 4, the hooking portions 32 of the stepped stands 2 and 3 engage with the locking portions 33.

Here, only the operation of the linear motion guide means P will be described. In the storage mode, the guide rail 9 and the guide wheel 10 are arranged so that, in the storage form, the sliding surfaces 9a at the rear ends of the guide rails 9 provided on the left and right of the upper tiers 2, 3 and 4 are connected to the lower tiers 1 and 2, 3 A guide wheel 10 provided at the rear end is located, and when each stage 1, 2, 3 moves forward, the guide wheel follows the sliding surface 9a.
10 moves forward. In the lower tiers 1, 2 and 3, the guide wheels 10 provided at the left and right symmetrical positions slide along the guide rails 9 arranged in parallel on the left and right of the upper tiers 2, 3 and 4, so that the lower tiers The tiers 1, 2 and 3 move forward along a reciprocating linear trajectory so that they are always guided straight. Further, in the staircase form, the guide wheels 10 provided at the rear ends of the lower stage stands 1, 2, 3 are provided at the front ends of the sliding surfaces 9a of the guide rails 9 provided on the left and right sides of the upper stage stands 2, 3, 4. The lower pedestals 1, 2 and 3 retreat so that they are always guided straight along the reciprocating linear trajectory in the same manner as when they are moved forward.

Linear motion guide means P consisting of links 12 and 13
Then, in the storage form, the vertically adjacent tiers 1, 2,
The links 12 and 13 provided at the positions 3 and 4 are positioned so that the other slidable other ends 12b and 13b are located farthest from the one ends 12a and 13a on the linear rails 14 and 15, respectively. Since the steps 1, 2, 3 and 4 connected by 12 and 13 are controlled by the links 12 and 13 so as to move in parallel to each other, the steps 1, 2 and 3 form a reciprocating linear trajectory. Always go straight ahead. When moving forward, the other ends of the links 12 and 13
12b and 13b are on the linear rails 14 and 15 at one end 12a and 13a
Slide to approach. When transforming from the staircase form to the storage form, the other ends 12b and 13b of the links 12 and 13 slide on the linear rails 14 and 15 in the opposite direction to the above, and perform the steps in the reverse order to the steps 1, 2 and 3 always recede straight along a reciprocating straight track.

[0018]

According to the present invention, in short, the winding transmission body 16 which emits the starting end 16a from the rear portion of the lowermost stage 1 is attached to each stage 1, 2,
Zigzagly wound around the rotating wheels 17, 18 and 19 arranged in front of and behind 3, 4, the rear rotating wheel 19 of the uppermost stage 4 is rearward of the rear rotating wheel 18 of each stage 1, 2, 3. And the winding transmission body 16 wound around the rear rotary wheel 19 of the uppermost stage 4 is wound around the rotating wheel 20 separately disposed under the uppermost stage 4 and the winding transmission body 16 of The stage interlocking means W in which the terminal end 16b is fixed to the lowest stage 1 is at least each stage 1, 2,
3 and 4 are arranged on the left and right in the width direction, and the stage interlocking means W are interlocked, so that the left and right in the width direction of each stage 1, 2 and 3 are connected by the winding transmission member 16, It is possible to move straight forward and backward along a reciprocating straight track. or,
The movement of each of the tiers 1, 2 and 3 is such that the load of the upper tiers 2 and 3 is applied to the lower tiers 1 and 2 even if it is pulled out or pushed in from the lowest tier 1. Although it cannot be said that the final form of the staircase form or the storage form is transformed through a certain drawer or push-in process, it is possible to sequentially draw out a plurality of stacked stage stands 1, 2, 3, 4 or Since they are connected so that they can be pushed in freely, in combination with the straight movements of the tiers 1, 2 and 3 as described above, in the staircase form, the tiers 1, 2 and 3 extend in the width direction thereof. The crossing tread L can be made constant, and in the storage form, each stage 1,
The risers K of 2, 3 and 4 can be located on the same vertical plane, and can be transformed into a desired final form.

According to the second aspect of the invention, between the stage interlocking means W and the vertically adjacent stages 1, 2, 3 and 4, the upper stage stages 2, 3 and 4 are the lower stage stages 1 and 1. Since the linear motion guiding means P for guiding and supporting the two, 3 along the reciprocating linear trajectory is provided, even if the stage interlocking means W is a single unit, the linear motion guiding means P allows each of the stages 1, 2, You can move straight along the reciprocating straight track without wobbling to the left or right during the retreat of 3.
An effect similar to the above is produced.

According to the third aspect of the present invention, between the vertically adjacent steps 1, 2, 3, 4 of the links 12, 13 of the same length intersecting each other in the X shape with the intermediate portions as fulcrums. One end 12a, 13a facing each other in the front and rear direction is pivotally attached to each stage 1, 2, 3, 4 and the other end 12b, 13b is connected to each stage 1, 2, 3, 4 respectively.
Since it is mounted slidably in the width direction of the table, when it is pulled out or pushed in, each of the tiers 1, 2 and 3 move in parallel to each other in the advancing / retreating direction, and the tiers 1, 2, 3 and 4 can be pulled out sequentially. Alternatively, since the treads L, 2 and 3 can be formed so that the tread surface L is constant in the width direction in the staircase form, the treads L can be fixed in the widthwise direction in the same manner as described above. The risers K of 3, 4 can be arranged on the same vertical plane. Moreover, in the invention according to claim 4,
In addition to the links 12 and 13 described above, the stage interlocking means W is provided, so that the stages 1, 2 and 3 can be further connected, and stable forward / backward movement along a reciprocating linear trajectory becomes possible. .

In the invention according to claim 5, the stage interlocking means W
Device 22 for pulling one end 16a of the winding transmission member 16 in
Since the urging means 22 contracts in response to the forward and backward movement of each of the terraces 1, 2, and 3, the winding transmission member 16 is always tensioned, and each of the terraces 1, 2, and 3 is moved. It is possible to smoothly operate and stabilize the operation of each stage 1, 2, 3.

In the invention according to claim 6, the stage interlocking means W
Since the rotating wheel 20 of the above is engaged with the drive source M, each stage 1, 2,
3 can be operated automatically, and since each stage 1, 2, 3 is interlocked as described above by the winding transmission body 16, each stage 1, 2, 3 can be moved forward and backward by one mechanism. It is moved, and it is not necessary to equip each mechanism for forward and backward movement and backward movement.

According to the seventh and eighth aspects of the invention, the front end portion 24a is located at the proper positions of the middle stage pedestals 2 and 3 and the rear end portion 24b and the fulcrum 24c.
A fulcrum 24c of the rocking rod 24 located below is pivotally mounted, and a long track 27 is provided in the upper and lower stages 3 and 4 for supporting the rear end 24b of the rocking rod 24, and the track 27 is provided. A hook-shaped paragraph 28, in which the rear end portion 24b is located, is recessed at the front end of the middle tiers 2 and 3, and the lower tiers 1 and 2 have the tier 1 In the state in which 2 has been completely stored in the lower parts of the middle pedestals 2 and 3, the front end portion 24a of the swing rod 24 is pressed to swing and hold the rear end portion 24b of the swing rod 24 above the track 27. By providing the piece 29, the bottom and top stages 1, 4
Drawer length (tread) L with each tier 2 and 3 except
In the completed state of the drawer protruding, the backward movement of the respective tiers 2 and 3 is restrained, and the lower tiers 1 and 2 are the upper tiers 2 and 3 so that the risers K are located on the same vertical plane. Since the above-mentioned restraint is released in the state where the storage is completed in the above, when the staircase form is transformed into the storage form, a regular and good-looking closet can be surely carried out sequentially from the lowermost stage 1. In the staircase form, the steps 2 and 3 do not retreat carelessly.

In the inventions according to claims 9 and 10, a lever rod 31 which swings up and down with a fulcrum as a pivot 31a is provided at the rear of each of the steps 2 and 3 except the uppermost and lowermost steps 1 and 4. At the rear end of the lever rod 31, a hook-shaped hooking portion 32 that rises upward is provided.
And a slanting portion 33 that descends backward and is continuous with the hooking portion 32, and the slanting portion 33 is in sliding contact with the rear portion of the uppermost stage 4 and the hooking portion 34 is engaged from below. By providing a locking portion 38, and by providing a hanging body 40 for pressing and holding the front end of the lever rod 31 upward in the state where the drawers 1 and 2 of the lower tiers 1 and 2 are completed, In the storage form, the forward movement of each stage 2, 3 excluding the lowermost stage 1 and the uppermost stage 1, 4 is restrained, and the restraint is released when the lower stage 1, 2 is completely drawn out. Therefore, when the storage form is transformed into the staircase form, regular and good-looking drawers can be surely performed sequentially from the lowest stage 1. Like this
Since the upper stage cannot be pulled out until the lower stage is completely withdrawn, there is no halfway-out state of each stage stand 1, 2, 3 and even if it is not necessary to pull out all stages. Therefore, it is possible to obtain a desired number of steps of stairs in which the respective treads L are arranged from the lowest step.

According to the eleventh and twelfth aspects of the present invention, since the forward push-in means X and the forward pull-out means Y are provided, the forward pull-out means Y is used to pull out the lower trays 1, 2 Since the upper tiers 2 and 3 do not operate until the drawing is completed, each tier 1, 2 and 3 is surely formed into a desired staircase shape with the drawer length (tread) L set uniformly in the width direction. Not only can it be transformed into, but it can also be pulled out sequentially from the bottom. In addition, by the forward pusher means X,
Until the lower tiers 1 and 2 are completely stored in the lower tiers 2 and 3, the upper tiers 2 and 3 do not operate. It can be surely transformed into a desired storage form to be placed on the surface, and can be pushed in sequentially from the lowermost stage, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a partially omitted cross-sectional view in plan view of a stair pedestal showing an internal structure in a stair form.

FIG. 2 is a partially cutaway side view of a stair pedestal in a stair form.

FIG. 3 is a partially cutaway side view of the stairs table in the stored form.

FIG. 4 is a right half cross-sectional view of a staircase in a staircase configuration, as viewed from the front direction.

FIG. 5 is a layout view of the right half of the rear leg of each stage in plan view in plan view.

FIG. 6 is a right half plan view of the rear leg of each stage in the stored form.

FIG. 7 is a side view partially omitted cross-sectional view of a staircase in a staircase form showing stopper means and linear motion guide means.

FIG. 8 is a cross-sectional side view of the stairs pedestal in a storage form showing a stopper means and a linear motion guide means, partially omitted.

FIG. 9 is an enlarged view of a rear view main part of the stairs stand showing the linear motion guide means.

FIG. 10 is a partially omitted cross-sectional plan view of a staircase in a staircase form showing another example of the linear motion guide means.

11 is a side view with a part of the side view of FIG. 10 omitted.

FIG. 12 is a partially omitted cross-sectional view of the stairs pedestal in a stored form as seen from the side.

FIG. 13 is a partially omitted cross-sectional side view of a staircase in a staircase form showing a staircase interlocking device.

FIG. 14 is a side view partially omitted cross-sectional view of the stairs table in the storage form showing the stepped table interlocking device.

FIG. 15 is a partially cutaway side view of the stairs pedestal in a staircase form showing the forward pushing means.

FIG. 16 is a partially cutaway side view of the stairs pedestal in a storage form showing the forward pushing means.

FIG. 17 is an enlarged cross-sectional view of the main part of the staircase platform in a staircase form showing the forward pushing means.

FIG. 18 is a plan view showing an operating state of the forward pushing means, FIG. 18 (a) is a diagram showing a state of the staircase in a staircase form, and FIG. 18 (b) is a diagram showing a state of the staircase in a storage form. is there.

FIG. 19 is a partially omitted cross-sectional side view of the stairs pedestal in a staircase form showing the forward drawing means.

FIG. 20 is a partially omitted sectional view of the stairs pedestal in a stowed form showing the forward drawing means.

FIG. 21 is an enlarged view of a rear view main part of the stairs pedestal in a staircase form showing the forward drawing means.

22A and 22B are plan views showing the operating state of the forward withdrawing means, FIG. 22A is a diagram showing a state of a staircase in a staircase form, and FIG. 22B is a diagram showing a state of a staircase in a storage form. is there.

[Explanation of symbols]

1 step Two steps 3 steps 4 steps 12 links 13 links 12a One end 13a One end 12b the other end 13b the other end 16 Winding transmission 16a starting point 16b termination 17 rotating car 18 rotating car 19 rotating car 20 rotating car 22 Biasing means 24 rocking rod 24a front end 24b rear end 24c fulcrum 27 orbit 29 Hanging piece 31 Leverage rod 31a Axis 32 Hook 33 Inclined part 38 Lock 40 detachable body M drive source L Drawer length (tread) P Linear motion guide means X Forward closing means Y Forward drawing means W stage linkage

Claims (12)

[Claims] 1. A plurality of tiers 1, 2, 3, 4 stacked and stacked.
Is a retractable staircase that is connected in sequence to be freely drawn out or pushed in, and the winding transmission body 16 that emits a starting end 16a from the rear part of the lowermost stage 1 is used before and after each stage 1, 2, 3, 4. Zigzag around the rotating wheels 17, 18, and 19 arranged at the rear, and the rear rotating wheel 19 of the uppermost stage 4 is arranged rearward of the rear rotating wheel 18 of each stage 1, 2, and 3. Rear rotating car of upper deck 4
The winding transmission body 16 wound around 19 is wound around the rotating wheel 20 separately arranged under the uppermost stage 4 and the winding transmission body 16 is wound around.
Stage interlocking means W in which the end 16b of each is fixed to the bottom stage 1
Is disposed at least on the left and right in the width direction of each stage 1, 2, 3 and 4, and each stage interlocking means W is interlocked with each other. 2. A plurality of stackable stage stands 1, 2, 3, 4
Is a retractable staircase that is connected in sequence to be freely drawn out or pushed in, and the winding transmission body 16 that emits a starting end 16a from the rear part of the lowermost stage 1 is used before and after each stage 1, 2, 3, 4. Zigzag around the rotating wheels 17, 18, and 19 arranged at the rear, and the rear rotating wheel 19 of the uppermost stage 4 is arranged rearward of the rear rotating wheel 18 of each stage 1, 2, and 3. Rear rotating car of upper deck 4
The winding transmission body 16 wound around 19 is wound around the rotating wheel 20 separately arranged under the uppermost stage 4 and the winding transmission body 16 is wound around.
Stage interlocking means W in which the end 16b of each is fixed to the bottom stage 1
A straight line that guides and supports the lower tiers 1, 2, and 3 along the reciprocating linear trajectory between the upper and lower tiers 1, 2, 3, and 4 that are adjacent to each other. A retractable staircase that is provided with a motion guide means P. 3. A plurality of tiers 1, 2, 3, 4 stacked and stacked.
It is a storage type staircase that is connected to the bottom of the table so that it can be pulled out or pushed in order.
Between 3 and 4, one end facing each other before and after links 12 and 13 of the same length that intersect in an X shape with the intermediate portion as a fulcrum.
12a, 13a are pivotally attached to each stage 1, 2, 3, 4 and
A retractable staircase, characterized in that the other ends 12b, 13b are mounted slidably in the width direction of each of the steps 1, 2, 3, 4. 4. A winding transmission body 16 which emits a starting end 16a from a rear portion of the bottom stage 1 is zigzagly wound around rotating wheels 17, 18, 19 arranged before and after each stage 1, 2, 3, 4. The rear rotating car 19 of the uppermost stage 4 is placed behind the rear rotating car 18 of each stage 1, 2, 3 so that the rear rotating car of the uppermost stage 4 can rotate.
The winding transmission body 16 wound around 19 is wound around the rotating wheel 20 separately arranged under the uppermost stage 4 and the winding transmission body 16 is wound around.
Stage interlocking means W in which the end 16b of each is fixed to the bottom stage 1
The retractable staircase according to claim 3, further comprising: 5. The retractable stair pedestal according to claim 1, 2 or 4, further comprising urging means 22 for pulling one end 16a of the winding transmission member 16. 6. The retractable staircase according to claim 1, wherein the rotary wheel 20 of the stage interlocking means W is connected to the drive source M. 7. The retreat movement of each of the tiers 2 and 3 in a drawer completed state in which each of the tiers 2 and 3 excluding the lowermost and uppermost tiers 1 and 4 protrudes by a set drawer length L. And the lower decks 1 and 2 are completely stored under the upper decks 2 and 3 so that the kick K is located on the same vertical plane,
7. The staircase stairs according to claim 1, 2, 3, 4, 5, or 6, further comprising a forward push-in means X adapted to release the restraint. 8. The forward pushing means X comprises a middle stage table 2, 3
At a proper position, the front end 24a is pivotally attached to the fulcrum 24c of the rocking rod 24 located below the rear end 24b and the fulcrum 24c, and the rear end 24b of the rocking rod 24 is attached to the upper tiers 3 and 4. A long track 27 is provided in front of and behind the track 27, and at the front end of the track 27, a hook-shaped paragraph 28 in which the rear end portion 24b is located is recessed in a state where the middle tiers 2 and 3 are completely drawn. , The lower pedestals 1 and 2 are pushed to the upper side of the track 27 by pressing the front end 24a of the oscillating rod 24 in a state where the lower tiers 1 and 2 have been completely stored in the lower tiers 2 and 3. 8. The retractable staircase according to claim 7, further comprising a hanging piece 29 for swinging and holding the rear end portion 24b of the moving rod 24. 9. In the storage form in which the respective decks 1, 2, 3 are housed in the lower part of the uppermost deck 4 such that the risers K are located on the same vertical plane, the lowermost and uppermost decks 1 The forward pulling-out means Y is provided so as to inhibit the forward movement of each of the tiers 2 and 3 except 4 and to release the restraint when the lower tiers 1 and 2 are completely withdrawn. The retractable staircase according to claim 1, 2, 3, 4, 5, 6, 7 or 8. 10. The forward pulling means Y is provided with a lever rod 31 that swings up and down with a fulcrum as a pivot 31a at the rear of each stage 2, 3 excluding the uppermost stage 1 and the lowermost stage 1, 4. , The lever rod
At the rear end of 31, a hook-shaped hooking portion 32 that rises upward,
A slanting portion 33 that descends rearward is provided continuously to the hooking portion 32,
At the rear part of the uppermost stage 4, a slanted part 33 is slidably contacted and a locking part 38 with which a hooking part 34 engages from below is provided. Latching body for pressing and holding the front end of the lever rod 31 upward when the steps 1 and 2 are completely drawn out.
The retractable staircase according to claim 9, wherein the staircase is provided with 40. 11. A plurality of tiers 1, 2, 3 stacked on top of each other.
4 is a storage-type stair pedestal that is sequentially connected so that it can be freely drawn out or pushed in, and each tier 2, 3 except the lowest tier and the highest tier 1, 4 has a set drawer length L. When the drawer is completed, the backward movement of each of the tiers 2 and 3 is suppressed, and the lower tiers 1 and 2 are stored in the lower tiers 2 and 3 so that the riser K is located on the same vertical plane. In the completed state, the forward closing means X configured to release the above restraint
And, each deck 1, 2, 3 is kicked into each lower part of the top deck 4
In the storage form in which they are stored so that they are located on the same vertical plane, each stage 2, 3 except the lowest stage 1 and the highest stage 4
And a forward drawer means Y configured to cancel the forward movement of the lower pedestals 1 and 2 and to release the inhibition when the lower pedestals 1 and 2 are completely withdrawn. 12. The forward pushing means X comprises a middle stage table 2,
The fulcrum 24c of the oscillating rod 24, whose front end 24a is located below the rear end 24b and the fulcrum 24c, is pivotally mounted at a proper position of 3, and the rear end of the oscillating rod 24 is attached to the upper stage bases 3 and 4. A long track 27 is provided before and after supporting 24b, and at the front end of the track 27, a hook-shaped paragraph 28 in which the rear end portion 24b is located is recessed in a state where the middle tiers 2 and 3 have been drawn out. Then, in the lower tiers 1 and 2, when the tiers 1 and 2 are completely stored under the middle tiers 2 and 3, the front end portion 24a of the rocking rod 24 is pressed to move upwards on the track 27. The swinging rod 24 is provided with a hanging piece 29 for swinging and holding the rear end portion 24b of the swinging rod 24, and the forward pulling means Y is provided in each of the stages 2 and 3 excluding the uppermost stage 1 and the lowermost stage 1 and 4. A lever rod 31 that swings up and down with a fulcrum as a pivot 31a is provided at the rear portion, and a hook-shaped hooking portion 32 that rises upward and a hooking portion are provided at the rear end of the lever rod 31.
32 is provided with a rearward descending inclined portion 33, and the inclined portion 33 is slidably contacted with the rear portion of the uppermost stage 4 and a hooking portion is provided.
34 is provided with a locking portion 38 that engages from below, and the lower deck 1
The retractable staircase according to claim 11, characterized in that a hanging body (40) for pressing and holding the front end of the lever rod (31) is provided on the upper rear part of the step (2) when the drawers (1) and (2) are completed. .