JPH086541B2 - Foldable ladder improvements - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention comprises two prefabricated metal angle uprights facing each other, the surface of which is perpendicular to the plane of the ladder and The present invention relates to an improvement of a foldable ladder that has two elongated ribs and folds a ladder by fitting a upright member by fitting a pivot into a hole provided in the rib so as to divide the tread plate.

(Problems to be Solved by the Invention) This type of ladder has four basic problems for which solutions have not been obtained.

1. Hold a ladder on the wall.

2. Release mechanism for opening the ladder.

3. Properly position the ladder release mechanism at several different heights to control the full opening of the ladder.

4. Automatic deployment of ladders and guardrails, either manually or by an electrical device driven by the release device, even when the shaft or grip of the other release device is at rest.

Therefore, when arranging such a foldable ladder that forms a ladder frame of a certain length on the front of the building that is higher than the height of a set of ladder frames, is the ladder the same height as the front of the building to be hung? , Or more, it is necessary to stack two or more ladder frames in order.

Such ladder frames must be connected to each other and integrated, or be a single foldable ladder, such ladders can be placed at various heights, such as entrances and exits to ladders. The entire ladder must be connected so that it can be opened. To this end, it is important to be able to remove the holding member of the movable upright and adjust the distance between the movable upright and the fixed upright at any point in the longitudinal direction of the ladder to which these members are attached. . One of the conditions is to align and maintain each of the ladder frames constituting the ladder in a vertical plane.

Considering that the front of the building does not always form a completely vertical plane, it is a fundamental measure to make the ladder holding and locking means adjustable so as to satisfy the above condition. Or, when a force is applied to the uprights or footboards of the ladder in a vertical or horizontal direction, the force must not cause the ladder holding locking means to disengage from the ladder.

For maximum safe operation of the various ladder unfolding devices, it is a requirement that they be properly placed where the ladder is installed in the building. For this purpose, on the one hand, on the fixed uprights of the ladder, all the predetermined points for mounting the shaft and the release device support, and on the other hand, on the transverse bar stop for the removal operation of the movable uprights, with the teeth of the release device above. It is of utmost importance to make on-site adjustments to all the predetermined locations for mounting the rails.

(Means for Solving the Problems) The improved emergency foldable ladder according to the present invention is 1
An upright member consisting of two or more continuous metal angle uprights whose inner surfaces face each other, a footboard segmented from the uprights, and an inner surface of the uprights perpendicular to the ladder plane. The edge of the first upright wing and the second, respectively
Each of the two center ribs and elongated ribs facing the corners of the uprights, the ribs of each upright being opposed to the other rib and pivoting for segmenting the tread at equal longitudinal intervals. The fixed angled uprights, that is, the uprights on the side to be placed in front of the building, have wings that are laterally parallel to the front of the building on both outsides. It is characterized by having.
Stretching members are provided which straddle the wings and, on both sides thereof, engage the edges of such horizontal wings. The horizontal wings are shaped to penetrate the throat of the groove of each elongate member, each elongate member having one or more at a desired location along the length of the parallel longitudinal slots. It is fixed by bolts, which provides the wings of the U-shaped unit anchored to the front of the building. The U-shaped member supports a fixed upright member through a unit whose groove is cut by its wing portion, and further, such a fixed upright member has a wing portion perpendicular to the front surface of the building and an adjacent rib. In between is the fact that the edge of the flat member, which is of equal length to one section of the ladder, can be fitted and has a double slot. Such flat members in each section of the ladder ensure continuity and connection throughout the length of the ladder and are designed to be connected to each other in such a way that the ladder can be kept folded or unfolded, and Through the holes
The toothed rails can be mounted so that they can be placed by the release device at predetermined positions, for example, at intervals of 30 cm.
A similar position is also provided on the horizontal wing portion of the fixed upright member, and a plurality of holes are used to insert a perforation gauge for perforating the shaft support portion of the lever handle.

In addition, a reinforcement support is provided for smooth operation of the series of flat members, pinions and toothed rails that facilitate the detachment and disassembly of the two uprights of the ladder, which reinforcement support is a fixed upright. Fits on the center ribs facing the vertical side wings of the material and is attached by screws or bolts, so it functions as a pivot bearing for the shaft of the release device and prevents deformation of the side wings of the fixed upright And, for that reason, an effective engagement of the pinion with the toothed rail is possible.

In another preferred embodiment, the stiffening support fits into a slot on the center rib to facilitate the operation of a series of flat members, pinions and toothed rails that facilitate desorption and disassembly on the two uprights of the ladder. Instead, it may be fitted only in the throat similar to the throat provided in the extension member having the groove attached to the inner edge of the U-shaped member side wing.
The reinforcement support in this case is provided with a hole which acts as a bearing for the pinion shaft of the toothed rail, the reinforcement support being held in place by two grooves, one on each side of this member. It

(Example) In order to help understanding of the present invention and clarify its characteristics,
An embodiment of the present invention will be described below in detail with reference to the drawings.

Referring to FIG. 1 and FIG. 1b, reference numeral 1 represents the front of a building, and hereinafter U is locked by an opening bolt 3.
The U-shaped member 2, an adjustment slot (FIG. 8) for adjusting the final mounting on the wall surface is provided on the back surface of the U-shaped member, and each wing holds an extension member 6. A slot 4 is provided through which the two bolts pass. The extension member 6 holds a fixed upright member 7 made of a fixed metal angle,
And, for example, when it is extended, it is slid in the vertical direction.
A fixed upright 7 of the ladder includes an elongated center rib 8 with a pivot hole for a tread (not shown). In the U-shaped member 2 (FIG. 8), the slot 4 is eccentric with respect to the central axis of the U-shaped member 2 so as to obtain the maximum displacement (X) in the lateral direction,
For example, even if the bolts to be locked to the building have to be moved in the horizontal direction due to, for example, reinforcing bars, all of the extension members 6 can be aligned in the vertical direction.

FIG. 1 shows a deployable movable upright member 10. When the movable upright member 10 is closed, a ladder frame is formed together with the fixed upright member 7. The movable uprights 10 are provided with elongated ribs 11 facing the center ribs 8 of the fixed uprights 7. The movable upright 10 has a hole 12 for pivoting a tread (not shown). As in the prior art, one of the elongated ribs 11 of the movable upright 10 is provided with elongated legs 13 and 14, which are provided with holes 15 for a guard rail pivot (not shown). Confronting the legs 13 and 14, there is a portion 16 forming an upright member on the opposite side of a guardrail (not shown). The portion 16 is also provided with a hole 17 for pivoting a guard rail (not shown).

FIG. 1a shows a center rib 8 according to another embodiment of the present invention. The center rib 8 has no slots 42, 43. There is a groove 8'instead of the slot 43, and the protrusion 44 'of the reinforcing support portion 41' fits into this groove 8 '. The reinforcement support 41 'is held in place on the groove 8'by notches formed on only one of its sides. Reinforcing support is hole 9 '
This bore 9'supports the shaft through the pinion of the toothed rail 32. Adjacent to the reinforcement support 41 'is a thick washer 41c (Fig. 1C) which serves as a separating member.
The thick washer 41c prevents the reinforcing support portion 41 'from being distorted.

9 and 10 show the opening / closing mechanism, particularly the lever handle 18 provided at different heights on the ladder on the side facing the outlet such as a window. Holes 48 are already provided every 30 cm on the wings of the fixed uprights 7 which are vertical to the front of the building. The hole 48 works with a gauge 49, which is bolted into one of the holes 48, to allow the shaft 29, and thus the other parts of the release device, to be fixed in position at the support 30.

In assembling each part of the ladder, the fixed uprights 7 are fixed to the front surface 1 of the building via the U-shaped members 2 and the movable uprights 10 are indirectly connected via the tread (not shown) and the fixed uprights 7. In this case, the movable members of each section must be simultaneously held by the corresponding fixed members, and the entire ladder can be disassembled at different heights. For this reason, the connecting means is directly provided for wearing and removing. Therefore,
On the inner surface of the fixed upright 7, a double slot 19 is provided in the vertical direction between the center rib 8 and a wing portion perpendicular to the fixed upright 7, and the flat member is provided in the slot 4.
Slide 20 in. This flat member has the same height as one step of the ladder. The flat member 20 is connected, for example, by a small plate and two screws (not shown) to the flat member 20 provided above and below the ladder, if any. A mounting member 21 (Figs. 3 and 5) is mounted on the flat member 20 (Fig. 1), and the operation of the apparatus is performed by the flat member 20 via the lever handle 18. The mounting member 21 has a U-shaped portion 22 with its rear surface facing the flat member 20, and pivotally supports the bracket 24 downward, and a shaft 23 biased to this position by a spring 25 penetrates this U-shape. are doing. Facing such a mounting member 21 forming an integral part of the vertical surface of the fixed upright 7, there is a member 26 (FIG. 6) having a bulge 27 and fixed to the movable upright 10. The bulging portion 27 engages with the lower surface of the bracket 24 when the ladder is folded. The member 26 is a leg 13 of the expandable movable upright 10.
Normally, the back surface 28 of this member is
Is recessed in the vertical direction so as to be located substantially at the central axis of the flat member 20. Therefore, after folding the ladder, remove the bulge 27 from the bracket 24 to open it again.
It is easily understood that the bracket as well as the flat member must be raised by lowering the lever handle 18. For this reason, the lever handle 18
(Fig. 1b, Fig. 3, Fig. 7, Fig. 10) shows fixed uprights 7
It is attached to one end of a shaft arranged on a support portion 30 fixed to the side wings of the. The shaft 29 penetrates the fixed upright member, is supported by the reinforcing support portion 41 at the other end, and has a center rib 8
Slots 42 and 43 above provide lateral positioning and locking and bolts provide longitudinal positioning and locking. A control button 50 is attached to the shaft 29, and the control button 50 is attached to the shaft 29. When the shaft 29 rotates, the pinion 31 rotates by acting on a protruding pin 51 provided on the control button 50. Then, push forward on the toothed rail 32 with the tooth profile cut. The toothed rail 32 is mounted upwardly on the flat member 20 by means of two pins 32a and thus rests on the bracket 24 on the mounting member 21. In order to deploy the ladder, a tilting arm 33 is arranged on the shaft behind the pinion 31, which is manipulated by the pin projection 51. The tilted arm 33 presses the center rib 13 of the movable upright 10 as the tip 34 moves away from the flat member 20.

An integral mounting member disposed on the flat member 20 as a whole
Before the movable uprights 10 are lifted and the movable uprights 10 are pushed by the tilting arms 33 and move away from the fixed uprights 7, in order to reliably perform the operation of removing the member 26 fixed to the movable uprights 10, The flat portion is provided with a curved slot 33a, and the protruding pin 51 is engaged with this slot to pull the inclined arm 33 to perform the pivoting by several degrees before the ladder is deployed over its entire height. Similarly, when operating the lever handle of the release device, the latter rotates the pinion 31, which pulls and moves the threaded toothed rail 32. The toothed rail 32 is fixed to the flat member 20. The toothed rails 32 provided on the flat member 20 are provided at each step of the ladder and act on the corresponding pinions, but do not cause the connected shaft 29 and lever handle to rotate. . This means that even if the lever handle of the release device is operated, its movement does not affect the movement of the lever handles of other release devices.

Further, when the ladder is unfolded and the lever handle 18 is released, the mounting member 21 and the flat member 20 which are integrated together return to the starting point, that is, the downward position. This movement is performed by a tension spring (not shown), one fixed to the bottom of the fixed upright 7 and the other fixed to the flat member 20.

The toothed rail 32 can be easily mounted on the flat member 20 without lifting the flat member 20 from the fixed uprights 7, and the rail is mounted at the correct position on the flat member 20 so that the pinion 31 of the releasing device is accurately attached. Double holes are provided in the flat member along the length of the flat member at all locations where release devices can be attached for mating and deployment of the ladder. In this case, the toothed rail 32 is attached to the flat member 20 using the pin 32a before mounting other members of the release device. Furthermore, this toothed rail is so designed that it cannot be removed from the flat member 20 once the other members of the release device have been fixed.

Extension member 6 and fixed uprights 7 (see FIGS. 1, 3 and 4)
To ensure a secure connection, the notch 35 of the extension member 6 is provided with a rounded groove 38 in which the fixed upright 7 is secured.
A rounded protrusion 40 having a shape corresponding to the small horizontal wing portion 36 is inserted.

The remaining side surfaces naturally have the same shape as the rounded protrusion 40. This also applies to the corresponding side surface of the horizontal wing 36, which has a shape adapted to the rounded groove. Providing appropriate clearances for the grooves 38 and 40a and the projections 40 and grooves 38 of the horizontal wing 36 makes it easy to attach the extension member 6 to the horizontal wing 36. After the extension member 6 is mounted at an angle and close to the horizontal wings 36, the extension member 6 is straightened and then anchored with bolts 5. As a result, the extension member 6 and the horizontal wing portion 36 of the fixed upright member 7 cannot be separated from each other.

Referring to FIG. 1b, the reinforcement support 41 is pressed into the center rib 8 of the fixed upright 7. To do this, the center rib 8 is provided with two laterally interlocking members. One is a straight slot 42 that is perpendicular to the center rib 8 and faces its end, and the other is a hook-shaped protrusion that surrounds the slot 43. One of the hook-shaped protrusions surrounding the slot 43 is parallel to the center rib 8 and the other is perpendicular thereto, and has a slot 43. After inserting the reinforcing support portion 41 into the slot 43 at an angle, it is pressed against the center rib 8 and pushed. Further, it is vertically fixed on the center rib 8 by a bolt (not shown). The reinforcing support portion 41 is formed in a substantially fork shape, and one end thereof has a flat protrusion 44.
Since the other surface is formed with the rounded protrusion 45, the slot 43 of the center rib 8 is arranged diagonally.
Can be straightened in. Further, on its back surface, that is, on the right side opposite to the shaft of the reinforcing member 41, a projecting portion 46 fitted into the slot 42 is provided. Center rib 8
This reinforcement support 41, which extends in the direction of the shaft, can face the shaft 29 in such a direction that it can act as a bearing for the shaft 29 of the lever handle 18. An opening 47 is provided for this purpose. At the same time, the reinforcing support portion 41 also serves as a separating member between the inclined arm 33 and the center rib 8. In this way, on the toothed rail 32 fixed to the flat member 20,
The shaft 29 of the release device can be accurately meshed with the reinforcing support portion 41, and various members for deploying the ladder operate smoothly.

Naturally, the extension member 6 is arranged according to the position of the U-shaped member 2 anchored to the wall 1, while the reinforcing support portion 41 is arranged according to the position of each lever handle 18.

Further, the extension member 6 and the horizontal wing portion 36, and the reinforcement support portion 41 and the center rib 8 are connected to each other by the extension member 6 and the reinforcement support portion 41.
Since it is not possible to obtain a slant, it is necessary not only to provide a rounded edge portion but also to provide a play that allows a fitting connection by providing a clearance in any of the members for connection. Such fitting also includes the extension member 6 and the reinforcing support portion 41.
Cannot be done simply by juxtaposing them in parallel. Each can only be engaged by placing it at an angle and then pivoting it sideways to flatten it. Thereby, the extension member 6
Also, the function of the reinforcing support portion 41 is not prevented.

Referring to FIG. 4, the elongate members 6 are small pieces each having a fixed length and are adapted to fit a small horizontal wing portion 36 parallel to the front surface of the fixed uprights 7 in a longitudinal slot.
You can see that 35 is provided. The member further has a threaded hole (not shown) in which the holes are arranged in two stages for inserting the bolt 5.

In another embodiment of the present invention shown in FIGS. 1a and 1c, a reinforcing support portion 41 'is used instead of the reinforcing support portion 41, and a slot is used.
Instead of the slot 43, a groove 8'is provided instead of the slot 43 so that the protrusion 44 'of the reinforcing support portion 41' fits therein. The reinforcing support portion 41 'is placed horizontally in the groove 8', pivoted upward, and then fixed in place. Two notches are formed only on each side of the groove 8'to lock the reinforcing support 41 'and the hole 9'for the shaft 29 (1a).
Figure). Without this, the reinforcement support 41 'would be free to move vertically. As described above, the reinforcing support portion 41 '
Hole 9'acts as a support bearing for the shaft 29 of the lever handle. In this embodiment, the release device becomes more rigid with respect to the pressure applied when the lever handle 18 is operated, so that there is an advantage that the pinion 31 more firmly meshes with the toothed rail 32.

On the other hand, in this embodiment, in addition to manually opening and closing the ladder, it can be electrically operated by incorporating an electrical contact for controlling a DC reduction motor driven by a rechargeable battery into the design. For this purpose, the groove 52 is provided in the fixed upright 7, and the wiring may be provided therein.

The tread may be provided with a spring that offsets a portion of the weight of the movable upright 10 after being released from the fixed upright 7 to obtain a smooth unfolding action. The spring has one arm inside the tread and the other arm pushes along a slot 53, which prevents lateral movement of the spring arm and holds it in place.

The present invention is not limited to the above embodiments, and modifications can be made without departing from the scope of the present invention.

(Effects) The present invention solves various inconveniences without considering the possibility that the components of the ladder may expand due to temperature changes, and without causing a stressed portion that may cause deformation at a specific portion of the ladder. The basic problems described above can be solved. The present invention further opens and closes the ladder by electrical control with pushbuttons located at some outlets that allow it to be raised and lowered.
In addition, it is possible to use both an electric switching means and a means as the opening / closing method. If one of the release devices fails, the other release means are used, or an electrical device provided for this purpose is used to open and close the ladder.

Another feature of the release device is that when the lever handle is operated, the pinion corresponding to the lever handle is rotated to move the toothed rail. The toothed rail is an integral part of the flat member, to which another toothed rail is fixed for each step. A toothed rail located on such a flat member acts on each corresponding pinion but does not pivot with its associated shaft and handle grip. This means that the arms of the release device can be operated independently of the movement of the arms of the other release devices.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a ladder frame of a folding ladder. FIG. 1a is a detail within the dashed circle of FIG. 1 showing a design according to another embodiment of the invention. FIG. 1b is a schematic partial cross-sectional view of a ladder frame showing a state in which the reinforcing support portion is attached to the fixed upright member. Figure 1c is a detail within the dotted circle of Figure 1b showing a design according to another embodiment of the invention. FIG. 2 is a scale diagram showing a part of the left side portion of the ladder frame by cutting out. FIG. 3 is a reduced scale view showing a part of the front surface of the ladder frame by cutting out. FIG. 3a is a detail within a circle surrounded by a dotted line in FIG. 3 and shows another embodiment of the present invention. FIG. 4 is a side view of the extension member. FIG. 5 shows a mounting member provided on a fixed upright member. FIG. 6 shows a mounting member provided on the movable upright. FIG. 7 is a schematic side view of the release device. FIG. 8 is a partial rear view of the anchor locking unit. FIG. 9 shows the two parts provided to release the ladder of the present invention. FIG. 10 shows an exploded general view of the parts provided for releasing the ladder of the present invention.

Claims (9)

[Claims] 1. A section of a foldable ladder comprises a fixed upright member 7 and a movable upright member 10 whose inner surfaces face each other, and a footboard segmented from the both upright members 7, 10 to form a fixed upright member 7. The surfaces of the movable uprights 10 that are perpendicular to the inner ladder surface each have two longitudinal center ribs 8 and elongated ribs that face the wing edges of the fixed uprights 7 and the corners of the movable uprights 10, respectively. The center rib 8 faces the elongated rib 11 and has holes 9 and 12 at equal intervals in the longitudinal direction for receiving the pivots of the segmented treads, and one or more sections in the longitudinal direction. Is a ladder for emergency evacuation that is designed to be folded in order, and the fixed uprights 7 on the side to be attached to the front of the building are curved on both sides, outside and side, with wings parallel to the front of the building. Horizontal wings 36
And an extension member 6 having a longitudinal slot which engages the end of such a horizontal wing 36 and is fixed to the slot 4 of the U-shaped member 2, said horizontal wing 36 being provided with each extension member 6 Having a shape that fits snugly into the upper groove 38, the elongate members 6 are each secured in parallel with the elongated slot 4 at one or more bolts at desired positions in the longitudinal direction, whereby the elongate member 6 is attached to the front of the building. The wings of the U-shaped member 2 to be anchored are formed, which U-shaped member 2 surrounds and holds the stationary upright 7 by means of a longitudinal slot 35. On the other hand, the fixed uprights 7 are hammerhead type double slots between the wings perpendicular to the front of the building and the adjacent center ribs.
In this double slot 19, both ends of a flat member 20 having the same length as one section of the ladder can be fitted, and the flat member 20 for each section is one section in order. One by one, the ladder is folded and unfolded so as to be connected so as to maintain continuity and connection over the height of one division, and the toothed rail 32 is flattened by the hole formed in the flat member 20. The lever handle 18 can be fixed at a predetermined position of 20, and the lever handles 18 can be arranged at intervals of, for example, 30 cm, and this position is to receive a cutout gauge 49 that determines a hole position for supporting the lever handle shaft. Fixed uprights 7 with holes provided in order for
Improvement of the folding ladder for emergency evacuation, which is also set on the horizontal wings of the. 2. Installation and removal of two uprights of a ladder,
In order to facilitate the operation of the series of flat members 20, the pinion 31 and the toothed rail 32, which allows disassembly, a reinforcement support 41
Is provided and is fitted into the center rib 8 opposed to the right-angled horizontal wing portion 36 of the fixed upright member 7 fixed with screws or bolts, so that the reinforcing support portion 41 is lever-handled.
It functions as a bearing for pivoting 18 axes, prevents deformation of the horizontal wing portion of the fixed upright member, and thereby maintains good meshing between the pinion 31 and the toothed rail 32. Improvement of the foldable ladder for emergency evacuation according to claim 1. 3. An adjusting slot is provided on the back surface of a U-shaped member 2 fixed by an opening bolt 3, and two elongated slots 4 are provided on both wings thereof, and two bolts 5 are provided in this slot 4.
Through which the extension members 6 holding the fixed uprights 7 of the ladder are held at different positions and can be slid vertically in order to extend the fixed uprights. The material is provided with an elongated center rib 8 and a hole 9 for a footboard pivot is provided on the center rib 8, and the slot of the U-shaped member 2 is eccentric with respect to the shaft. It is characterized in that the U-shaped member can be rotated by 180 degrees even if it has to be laterally displaced, and the lateral movement for accurately aligning all of the extension members 6 in the longitudinal direction can be performed to the maximum. An improvement of the foldable ladder for emergency evacuation according to claim 1. 4. An elongated double slot 19 is provided on the inner surface of the fixed upright 7 between a wing portion perpendicular to the surface of the fixed upright 7 and the center rib 8, and a flat member 20 is provided therein. The height of the flat member 20 is the same as that of one section of the ladder, and each flat member 20 uses, for example, a small plate and two screws. Characterized in that it is connected to the member 20, and also,
The mounting member 21 is fixed to the flat member 20 and the device is operated by a lever handle. The mounting member 21 includes a U-shaped portion 22 having a rear surface facing the flat member 20 and facing the arm. A shaft 23 supporting a bracket 24, which is pressed and positioned by a spring 25, passes therethrough, and further faces the mounting member 21 which is integral with the fixed upright 7 on a vertical plane as a whole, and a bulge portion. Member 26 having 27 and fixed to movable uprights 26
Is provided, the bulging portion 27 engages with the lower surface of the bracket 24 when the ladder is closed, the member 26 is fixed to the leg portion 13 of the movable upright 10, and the rear portion 28 of the member is fixed. Is provided with a vertical recess so that the bulge 27 is located substantially on the longitudinal axis of the flat member 20. Improvement of the foldable ladder for emergency evacuation. 5. A support portion fixed to a horizontal wing portion of a fixed upright member 7.
A lever handle 18 is attached to one end of a shaft 29 arranged in 30. The shaft 29 penetrates the upright member, is laterally positioned and fixed by slots 42 and 43, and is longitudinally fixed and fixed by bolts. The other end is held by the reinforced support portion 41, and a control button 50 for rotating the pinion 31 by acting on the protruding pin 51 on the pinion 31 is fixed to the shaft 29, and the two pins 32a are fixed. Bracket on mounting member 21 according to toothed rail 32 mounted on flat member 20 using
A slanting arm 33 is provided on a shaft 29 behind the pinion 31 and is manipulated by a projecting pin 51 to push the 24 up or to unfold the ladder. As the portion 34 moves away from the flat member 20, the inclined arm 33 is pressed against the outer surface of the movable upright member 10, and the movable upright member 10 is pushed by the inclined arm 33 so as to be fixed upright member. Before moving away from 7, the mounting member 21, which is arranged on the flat member 20 and which is integral as a whole, is lifted up and removed from the member 26 fixed on the movable upright 10, so that the flat portion of the inclined arm 33 can be removed. Curved slot 33a
5. The pin 51 fitted in the slot is pivoted to pull the inclined arm 33 to deploy the inclined arm 33 over the entire length of the ladder, according to any one of claims 2 to 4. Improvement of the foldable ladder for emergency evacuation described in paragraph 1. 6. A protrusion 4 of a reinforcing support 41 'having a curved portion of a center rib 8 forming a groove 8', and having a hole 9'in the groove.
4'is fitted, and the reinforcing support portion 41 'is a thick washer having slots and holes provided at both ends of the groove 8'.
41c is held at a predetermined position, the shaft 29 engaging with the above-mentioned hole 9'is passed through this hole, and the thick washer 41c further has a function of preventing distortion of the reinforcement 8 support portion 41 '. An improvement of the folding ladder for emergency evacuation according to any one of claims 1 to 4, which is characterized in that. 7. When the lever handle 18 is operated, the lever handle rotates each pinion 31, and the pinion 31 moves the corresponding toothed rail 32 integrally connected to the flat member 20, Flat member 20 has one more for each step
Two toothed rails are provided, and the toothed rails 32 on this flat member 20 correspond to the corresponding shaft 29 and lever handle.
Claim 18 characterized in that it acts on each pinion 31 without rotating 18 so that the lever handle of the release device can be operated independently of the movement of the lever handle of the other release device. Improvement of the foldable ladder for emergency evacuation according to any one of 6th paragraph. 8. The fixed upright 7 is provided with a groove 52, and a wiring for connecting each element of the ladder expansion electric system is inserted therein. Improvement of the folding ladder for emergency evacuation described in any one of 1. 9. One or more electrical contacts control a reduction motor driven by a rechargeable battery or other suitable power source, thereby manipulating the flat member 20 over its entire height, resulting in a ladder upright. Other manual release pinions and tilt levers that will be
The foldable ladder for emergency evacuation according to any one of claims 1 to 8, characterized in that the shaft (29) and the lever handle (18) are operated even when they are not moving.