JP2020007792A - Stepladder serving as simple scaffold - Google Patents

Abstract

To provide a stepladder serving as a simple scaffold which has a top plate working part as a scaffold, which is provided with a safety fence and a step-off preventing part for preventing an accident of stepping off a foot on the top plate working part, which ensures safe and secure work at high places, and which can cope with a work at a higher place only by adding an auxiliary leg part to a ladder part or a supporting leg part.SOLUTION: A stepladder serving as a simple scaffold includes: a front ladder part having two vertical members and a plurality of horizontal crosspieces suspended therebetween; a top plate working part having a side part fixed to the upper end side of the front ladder part; a rear ladder part having two vertical members rotatably mounted to a rear part of the top plate working part via a rotary part and a plurality of horizontal crosspieces suspended between them; a safety fence fixed to at least three surfaces of the top plate working part in a fixed or detachable manner; and a step-off prevention part disposed to at least three surfaces around the top plate working part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a simple scaffold and stepladder, and more particularly, to a top work section formed on an upper portion of a ladder section, and a rear ladder section or a support leg section connected to the rear of the top work section so as to be openable and closable. It can be used as a tripod for simple scaffolding and pruning work, etc.In addition, it has a safety fence and a step-off prevention part on the top plate working part, so it is excellent in safety and convenience, The present invention relates to a simple scaffolding stepladder having a free leg for a supporting leg, which can increase the height of a work portion of the top plate by one step or more, and in which one unit can perform two or more operations.

  Conventionally, when working in high places such as pruning garden trees, construction work, interior work, inspection of equipment, etc., a stepladder that connects a pair of ladders openable and closable at the upper end, and a long ladder on the upper end of the ladder part. A tripod with a bar-shaped supporting leg is used. Usually, these stepladders have a short horizontal rail and a small footrest area, so workers work in an unstable state, and as a result, fall accidents and stepladder fall accidents are likely to occur. The workability and safety were lacking, such as the need to pay extra attention due to anxiety about the work.

Various patent documents have been disclosed to solve such problems. For example,
Patent Literature 1 states that, in a stepladder in which the upper ends of a pair of ladders are continuously connected in a hinge structure and can be freely opened and closed within a certain angle, stopper grooves are provided at corresponding positions of the frame, and the stopper grooves are provided. Discloses a stepladder in which an assembling scaffold composed of a tread plate and a riser plate provided on one side of each long side with a guide for fitting with a hook latch is combined on a frame.
Patent Document 2 states that "a staircase provided between two aluminum pipes, a work floor provided at the top of the staircase, a plurality of legs supporting the work floor, and a bridge mounted on the legs. A foldable simple structure in which a rocking stopper, an opening stopper connecting lower portions of the legs, a slip stopper disposed on the legs and the like, and a node of each member such as the aluminum pipe and the legs can be rotated. Scaffolds "are disclosed.
Patent Document 3 states that "a base unit having an opening in the upper front and having a space inside, and a base unit which is pivotally attached to the base unit near the lower side of the opening which is horizontal on the back side, so that the stair unit is rotatable. A foldable stepladder having a stair unit having a pivot shaft that can be freely inserted into and removed from the space, and a stopper that holds the stair unit housed in the space in the base unit is disclosed.
Patent Literature 4 discloses "a pair of left and right front legs, a pair of left and right rear legs connected to the upper end of the front leg so as to be openable and closable, a plurality of tread plates having one end rotatably mounted between the fore legs, and a tread plate. A link member pivotally attached to the free end and disposed in parallel with the front leg, a horizontal rail provided between the rear legs and capable of mounting and supporting a tread plate in an open state, and one end at the free end of the tread plate Foldable stepladder having a pivoting member and an opening preventing member pivotally attached at the other end to the horizontal rail.

Japanese Utility Model Publication No. 61-20700 Japanese Utility Model Publication No. Sho 61-124552 Japanese Utility Model Registration No. 3022528 JP 2001-140568 A

However, the above conventional technology has the following problems.
(1) The “stepladder” of Patent Document 1 has a problem that the assembling scaffold must be attached to the stepladder, removed or slid to a predetermined position, and the assembling scaffold installation work is complicated and difficult to use. Was.
(2) Also, since the assembling scaffolding is provided so as to protrude outside the frame, the stability is lacking. Therefore, the assembling scaffold is easily wobble by the worker during the work, and it is easy to tilt because the center of gravity is behind, so that it is safe. There was a problem of lack of sex.
(3) Since the guide and hook are fitted to the hook latch and the scaffold is attached to the frame, there is a problem that the guide or hook is easily detached when the stepladder is wobbly or inclined, and lacks stability and safety. I was
(4) The “foldable simple scaffold” of Patent Literature 2 has a problem that it is composed of many members, has a large number of parts, cannot be compact even if folded, and has a large weight, and thus lacks transportability and storage properties.
(5) In the “foldable stepladder” of Patent Document 3, since the stair unit is rotated in the vertical direction at the front of the pedestal unit and put in and out of the vacant space of the pedestal unit, the turning radius of the stair unit cannot be increased. There was a problem that the step could not be used as a stepladder, and only low-place work could be performed.
(6) In the “foldable stepladder” of Patent Document 4, the number of parts is large, the number of pivot points is large, the structure is complicated and productivity is low, and the stability of the upper stepping plate is poor, and wobbling and shaking are increased. Therefore, there is a problem that the height can only be used as a stepladder having a height of about 1 m and cannot be used for work at height.
(7) Also, various stepladders including those described above have been developed at present, and those having a pair of ladder portions (so-called quadruped type), tripod type, combined type that can be linearly used as a ladder, etc. However, all of the conventional stepladders lack ease of use, stability, and safety, making them difficult for operators to use.As a result, workability using the stepladder is significantly reduced, and the structure is complicated. There are many problems such as lack of productivity, and development of a new stepladder that solves these problems is desired.

In order to solve these problems, the inventor has conducted intensive research, completed the invention, and obtained a patent right (Japanese Patent No. 3821836).
The stepladder that obtained the patent has stairs with a wide tread surface, so it is possible to work with ease and workability is excellent, and at the same time, the stairs are arranged inside the ladder and the weight related to the stairs is stepladder. The center of gravity of the ladder is closer to the center, improving the stability of the stepladder during work and the safety of workers.The staircase can be stored between the ladders when folded, making it compact and excellent in transportability and space saving during storage. It is compatible with any of the four-legged, three-legged, and dual-purpose stepladders, has a simple structure, and is excellent in productivity.

  However, the stepladder of the patent is based on the premise that no person climbs on the top plate as in the past, so that the top plate is narrow, and a turning connection is provided at the top of each ladder. Therefore, there is a problem that it is difficult to climb on the top plate excessively, and there is no handrail even when climbing to the top plate portion, and since it is narrow, it is difficult to perform work at high places. In addition, because the length of the ladder is fixed, a stepladder must be prepared for each work site according to the height of the work site. There was a problem that space was required.

  The present invention solves the above-mentioned conventional problems, and has a top work section serving as a scaffold, a safety fence in the top work section, and a step-off prevention section for preventing an accident of stepping off a foot. The work can be done safely and with peace of mind, and when working at higher altitudes or when working on uneven terrain such as steps or sloping terrain, the length of the free legs of the ladder and support legs By adjusting the (height), a single stepladder can cope with the situation, which is excellent in convenience. Furthermore, an object of the present invention is to provide a simple scaffolding stepladder which can be used as a simple scaffolding because the top plate working section and the stairs are wide.

In order to solve the above-mentioned problems, a simplified scaffold / stepladder of the present invention has the following configuration.
The simple scaffold / stepladder according to claim 1 of the present invention has a front ladder portion having two vertical members and a plurality of horizontal rails provided therebetween, and a front or side portion at an upper end of the front ladder portion. A top work section having an isosceles trapezoidal shape in which a square portion or a rear portion is formed at the lower bottom, and a rotatably mounted 1 at the rear portion of the top work section via a rotation section. A support leg portion of the main leg or a rear ladder portion having two vertical members and a plurality of horizontal rails laid therebetween, and a square fixed or detachably fixed to at least three surfaces of the top plate working portion or An isostrap-shaped safety fence with a rear part formed on the lower bottom, and a square or trapezoidal-shaped rear end formed on at least three surfaces around the top plate working part. And a part.

With this configuration, the following operation is obtained.
(1) Since it has an equal-leg trapezoidal top work section having a wide square or a rear portion formed on the lower bottom, it has become possible to work on the top work section at the uppermost stage which could not be used conventionally.
(2) A safety fence is provided in the work area of the top board, so that work can be performed on the work area of the top board with peace of mind. In addition, since the body is supported by the safety fence, the work range is greatly expanded compared to the conventional stepladder. In addition, the amount of work can be greatly increased, and it is possible to work calmly without having to pay extra attention due to anxiety of falling from the top work section.
(3) Since the stepping prevention section is provided around the top panel working section, it is possible to prevent an accident of stepping off the top panel working section and falling when working.
(4) Since the top plate working part is fixed on the side and lower surface at the upper end side of the front ladder part, only the support legs and the rear ladder part that are rotatable when keeping the top plate working part horizontal The installation work of the simple scaffolding and stepladder can be easily performed, and the installation workability is excellent.
(5) When the top work section, the safety fence, and the step-off prevention section are in the shape of an equiped base with a rear bottom formed on the bottom, the center of gravity is maintained even if the worker moves on the top work section during work. Since it comes near the center of gravity of the simple scaffolding stepladder, it is possible to prevent the simple scaffolding stepladder from tilting or falling.
(6) Since the supporting leg and the rear ladder can be opened and closed freely, the simple scaffolding stepladder can be folded down at the end of the work, and can be made compact.

Here, as the support leg and the rear ladder, a rod-shaped or pipe-shaped member made of a metal material such as aluminum or light alloy is used. It is preferable to provide an installation surface fixing portion also at the lower end of the support leg to enhance the installation stability.
The size of the top plate working section can be set as appropriate according to the use of the stepladder and the installation space. If the depth of the top work section is reduced, the space between the front and rear ladders becomes narrower and it can be installed at a narrow work site.If the depth of the top work section is increased, workers will have a wide foothold of the platform. The work area can be greatly expanded, and the workability can be improved. In addition, the space for placing tools and materials in the work area of the top plate can be widened, many tools and materials can be kept at hand, and the number of times a simple scaffold and stepladder goes up and down to change tools etc. Since it is reduced, labor saving and workability can be greatly improved.
In the case of a square, the top plate working unit is preferably formed to have a width of 30 to 50 cm and a depth of 30 to 100 cm. In the case of an isosceles trapezoid, it is preferable that the upper part of the front part has a width of 30 to 50 cm, the depth of 30 to 100 cm, and the lower part of the rear part has a height of 15 to 40 cm. Since the scaffold is wide, the working range can be expanded to 360 degrees, and work can be performed with confidence. In addition, in the case of an equipod trapezoid, the rear ladder side is set to the upper bottom, so that as the worker goes to the rear ladder side, the center of gravity of the worker approaches the center of gravity of the simple scaffold and stepladder, so it can also be used as a simple scaffold for work. The stability of the stepladder can be improved.
It is preferable that the top plate working portion and the front ladder portion are fixed to the support plate or the frame material, etc., which is fixed on both sides by a screw or the like or fixed by welding.

The height of the safety fence is preferably around the waist of an adult from the viewpoint of safety. If it is too low, the upper body may protrude out of the fence and fall, which is not safe. The safety fence may be integrally manufactured as a whole, or may be separately mounted on and fixed to the fixed portion of the peripheral wall of the top plate working unit independently of each other surface. When each surface is manufactured independently, it is possible to store a simple scaffold and stepladder, and to prevent bulkiness when transporting, and it is excellent in space saving. Welding the lower end of the safety fence improves safety. In addition, the safety fence may be made detachably on the top panel working unit, and adjacent surfaces may be connected by a hinge. After the work, it can be removed from the top panel work section and folded for storage and transport, and is excellent in storage and transportability.
The safety fence may be provided around the top board working unit, or may be provided on three surfaces of the top board working unit from which the front part has been removed so as to easily go up and down to the top board working unit.
When the safety fence is detachably mounted on the top work section, a vertical member fixing section for fixing a lower portion of the vertical member of the safety fence is formed in the top work section.
It is preferable that the step-off preventing portion is formed integrally with the safety fence and the vertical member fixing portion. This is to improve the mechanical strength of the safety fence. It is preferable that the height of the step-off preventing portion is 3 to 20 cm from the upper surface of the top plate working portion. This can prevent the foot from stepping off from the top plate working section and enhance safety.

At least the longitudinal member of the front ladder portion can be curved in a bow shape on the left and right sides to improve the stability of the simple scaffolding stepladder.
On each opposing surface between the front and rear ladder portions, an open state holding member for opening and closing the simple scaffolding stepladder is provided. When a single leg support leg is used instead of the rear ladder portion, an open state holding material for opening and closing the simple scaffolding stepladder is provided on each of the opposing surfaces between the front ladder portion and the support leg portion.
As the open state holding material, one end of a long holding material formed so as to be freely bent at a predetermined portion is axially attached to each vertical member or a predetermined portion of the support leg, and the other end is formed between the opposing vertical members. And the like that is installed on the vehicle. The top plate working unit is configured to be horizontal with the open state holding material held at 180 °. Thereby, the worker can work safely and smoothly without the balance being disturbed on the top work section or the tread plate, or the work implement or the like placed on the tread plate being rolled and dropped.
In addition, it is preferable that the simple scaffold combined stepladder is provided with a closed state holding portion such as an open stopper having a hook structure for holding the front and rear ladder portions in a closed state.
It is preferable to provide a level on the side rail of the ladder portion, the work portion of the top plate, or the like. This makes it possible to easily perform the installation work of the simple scaffolding and stepladder while confirming that the top plate working section and the horizontal rail are horizontal.

According to a second aspect of the present invention, there is provided the simple scaffold combined stepladder according to the first aspect, wherein the supporting leg is rotatably connected to a rear portion of the work portion of the top plate and a predetermined portion of the supporting leg. The plate-shaped projecting portion provided, the support leg fixing portion rotatably fixed to the plate-shaped projecting portion, and the horizontal rail that horizontally supports the support leg fixing portion with the top plate working portion. A locking portion for locking the other end of the support leg fixing portion to the vertical member in a detachable manner.
With this configuration, the following function is obtained in addition to the function obtained in claim 1.
(1) Since the tripod is formed by the support leg, it can be suitably used particularly for pruning work and the like.
(2) Since the supporting leg is connected to the rear part of the top plate working unit via a rotary connecting part so as to be openable and closable, the supporting leg is opened, and the supporting leg fixing part is connected to a horizontal rail or a vertical member hook. Since the work portion of the top plate can be stably held horizontally and stably, the safety and workability are excellent.
(3) By releasing the locking of the supporting leg fixing portion from the locking portion, the supporting leg portion can be closed and the simple scaffolding stepladder can be compactly folded.

Here, the rotating connecting portion is a structure having a rotating portion that freely penetrates a connecting shaft that is bridged at the tip of the supporting plate on both sides of the top plate working portion, and a shaft portion mounted on each supporting plate. It is formed by a structure or the like that is rotatably mounted on the vehicle.
Since the supporting leg fixing portion is detachably fixed to the locking portion, the simple scaffolding stepladder can be folded by removing the supporting leg fixing portion from the locking portion. By forming a retaining portion of the supporting leg fixing portion below the supporting leg fixing member holding portion of the supporting leg portion, the supporting leg fixing portion removed from the retaining portion can be retained by the retaining portion, so that a simple scaffold is provided. When the combined stepladder is transported, the supporting leg fixing portion can be prevented from swinging, and is excellent in transportability.
General locking means such as thumb screws, bolts and nuts, and bending pins are used as the locking portion and the locking portion.

According to a third aspect of the present invention, in the first or second aspect, each of the vertical members and the supporting legs of the front ladder portion and / or the rear ladder portion is formed of a pipe material or a plate-like member. In addition, a single-leg or bifurcated free leg is inserted or attached to the lower end of each of the vertical members and the support legs and fixed at a predetermined length.
With this configuration, the following operation is obtained in addition to the operation obtained in claim 1 or 2.
(1) The installation surface of the simple scaffold combined stepladder is in uneven terrain such as sloping ground or stairs.
Adjustment of the length (height) of the free leg allows the height difference to be absorbed, even if there is a height difference between the child parts and each vertical member, or between the front ladder part and the support leg. The top surface can be kept horizontal.
(2) When the height of the work position is different, it is only necessary to adjust the height of the free leg, and it is not necessary to prepare and level the plurality of stepladders with different heights as in the past, greatly improving workability. Can be improved.
(3) When the bifurcated free leg is used, it becomes a quadruped, and the stability of the simple scaffolding stepladder can be improved, giving the worker a sense of security and reducing the mental fatigue of the worker. .
(4) Since the one-legged or bifurcated free leg is lighter than the rear ladder, it is excellent in transportability.

Here, as the one-legged or bifurcated free leg, a rectangular or pipe-shaped member made of a metal material such as aluminum or a light alloy is used. It is preferable to provide an installation surface fixing portion having a biting portion or the like at the lower end of the single leg-shaped free leg or the bifurcated free leg in order to enhance the installation stability.
The single leg-shaped free leg or the bifurcated free leg is preferably formed to have a length of 300 to 1400 mm, depending on the length of the support leg.
The bifurcated free leg is formed by a central leg and a bifurcated portion whose top is fixed to the lower part of the central leg by welding or the like, and the bifurcated portion is formed in a semi-elliptical shape or an isosceles triangular shape.

It is preferable that the length of the central leg is 180 to 700 mm, the height of the forked part is 400 to 1000 mm, and the lower end of the lower leg is 900 to 1200 mm. By forming the length of the single leg-shaped free leg or the bifurcated free leg to these lengths, the rotation moment of the simple scaffold and stepladder is reduced, the swing of the simple scaffold and stepladder is reduced and reduced, and the fall is prevented. Can be prevented.
Through holes are formed in the free leg at a pitch of 30 to 50 mm and penetrate the front and rear walls. Two or more engaging holes communicating with the through holes are formed in each of the vertical members and the support leg portions. The free leg can be fixed at a predetermined length by inserting two or more locking members between the locking hole and the through hole. Further, it is preferable that an abrasion preventive material is provided in each of the vertical members and the formation portions of the locking holes of the support leg portions in order to prevent abrasion of the locking holes.

The simple scaffold combined stepladder has a front ladder part with a front end fixed on the upper surface of one horizontal rail and fixed from the one horizontal rail toward the inside, and upward from the inner end of the footboard. A kick-up plate fixed to the other cross rail above the one cross rail and having an upper end portion connected to both side portions of the top plate working portion or the support plate and both side portions of each tread plate. One or more stairs having a stair reinforcing part may be provided.
With this configuration, the following operation is obtained.
(1) Since the ladder portion has a stair portion having a tread plate and a kick-up plate, the worker can work on a high place in a stable posture on the tread plate having a wide tread surface and step off the foot during the work. It is possible to place work tools and materials on the tread plate, and to reduce the number of times of going up and down the front ladder to change the work tools and materials during work, and to work for a long time. Possible and excellent workability.
(2) Since the load on the tread plate is supported by the kick plate and the horizontal rail of the ladder, the load on the tread plate is dispersed, so the load bearing capacity can be increased and various tasks can be performed safely as a simple scaffold. It can be performed.
(3) Since the stairs with the treads extending inward from the horizontal rail are arranged inside the ladder, the tread surface is located near the center of gravity of the simple scaffolding and stepladder, providing excellent stability. As compared with the conventional stepladder, even if the worker rises, it is difficult to swing or tilt and fall down, so that the stability and safety are excellent.
(4) Since the stairs are disposed inside the ladder, the stairs can be accommodated under the top plate working part without being greatly protruded outside the ladders when folded, so that the whole is compact. Excellent transportability and space saving during storage.
(5) Since the stair reinforced portions are provided on both sides, the stair portions are reinforced, and even if a force is applied to the toes of the worker during work and the weight is applied to the tread plate, the force can be dispersed, and the tread plate bends or comes off. Can be prevented and safety can be improved.

Here, as a means for fixing the tread plate or the kick-up plate to the horizontal rail, welding, screwing, riveting, or the like is used.
One or more openings can be formed in the kick-up plate. Thus, the weight can be reduced while maintaining the strength.
If press molding, FRP molding, or the like is used for the staircase, a staircase designed to have a predetermined strength can be easily manufactured, and the productivity is excellent.
Since the stair reinforcing portion is provided, even if a local load is applied to the stair during transport, it can be prevented from being deformed or detached.

As described above, according to the present invention, the following advantageous effects can be obtained.
-According to the invention described in claim 1,
The large work area of the top board is equipped with a safety fence and a step-off prevention part, so that the work volume can be significantly increased compared to the conventional stepladder, and the conventional stepladder could not work on the top plate. Since the board work area is wide and equipped with a safety fence and a step-off prevention section, it can be used in a 360-degree work range on the top plate with peace of mind, and can also be used as a simple scaffold that can perform work at heights safely and safely. A stepladder can be realized.

According to the invention described in claim 2, in addition to the effect obtained in claim 1,
With the support legs, it can be used not only as a quadruple, but also as a tripod suitable for pruning work. By locking the support leg fixing portion between the plate-shaped projection and the locking portion, The board working portion can be easily held horizontally, and a simple scaffolding stepladder that can significantly improve safety and work efficiency can be realized.

According to the third aspect of the invention, in addition to the effects obtained in the first or second aspect,
Conventionally, depending on the content of the work, preparation of a plurality of heavy stepladders was required in the past, but work with one or more conventional stepladders was possible with the free leg, and on slopes and It can be installed on uneven terrain, such as steps, and has excellent workability. In addition, since the free leg is stored in the vertical member or the supporting leg, it is possible to realize a compact scaffold combined stepladder excellent in transportability and workability.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
(Embodiment 1)
FIG. 1 is an overall perspective view showing a state in which the front and rear ladder portions of the simple scaffold and stepladder according to the first embodiment are opened, and FIG. 2A is a main part of a top plate working unit according to the first embodiment. FIG. 2B is a central cross-sectional view of a main part on the top plate working unit side in the first embodiment.
In FIG. 1, reference numeral 1 denotes a simple scaffold combined with a stepladder according to the first embodiment, 2a and 2b denote a pair of front and rear ladder portions, and 3 denotes a square material of the front and rear ladder portions 2a and 2b and a vertical cross section made of a circular or square pipe material. Reference numerals 3a, 3a denote plate-shaped projecting portions fixed to opposing surfaces of the vertical members 3, reference numeral 4 denotes an installation surface fixing portion fixed to the installation surface at the lower end of each vertical member 3, 5, 5a to 5d. Is a crossbar erected between two vertical members 3, 6 is a square or isosceles trapezoidal top work section continuously fixed to the upper end of the front ladder 2a, and 7 is a top work section. And a pair of support plates 7a and 7b fixedly provided on both sides of the upper end of the front ladder portion 2a. 21 (see FIG. 2A). The top plate working part 6 is fixed to the upper surface of the front ladder part 2a and the side parts of the support plates 7a and 7b by screws or welding. Reference numeral 8 denotes a step portion provided on the front ladder portion 2a, and reference characters 8a to 8d denote front ends disposed and fixed on the upper surfaces of the horizontal rails 5a to 5d of the front ladder portion 2a. The side plates 9a to 9d are formed upward from the rear ends of the step plates 8a to 8d, and the upper ends thereof are provided at the upper ends of the horizontal bars 5b to 5d. The kick-up plate 10 fixed to the top plate working unit 6 is fixed to the both sides of each of the tread plates 8a to 8d and the kick-up plates 9a to 9d of the stair portion 8 and both support plates 7 by welding or the like. It is a long plate-shaped staircase reinforcement.

  Reference numerals 11a and 11b denote open state holding members which are erected at predetermined heights on both sides of the front and rear ladder portions 2a and 2b and hold the open state of the front and rear ladder portions 2a and 2b. It is fixed to the plate-shaped projecting portions 3a, 3a and is continuously connected to the holding member shaft attaching portion 12 so as to be freely bent. Reference numeral 12a denotes a shaft attachment portion for rotatably holding the ends of the open state holding members 11a and 11b. Reference numeral 12b denotes a distal end portion of the open state holding member 11a, and the open state holding material 11a is at a right angle above the holding member shaft attachment portion 12. Opening prevention pieces for preventing the open state holding members 11a and 11b formed by bending in the direction of being excessively opened, 13 is a level installed on the tread plate 8a, and 14 is between the lowermost horizontal rail 5 and the vertical member 3. The horizontal beam support reinforcement portion provided, 15 is a safety fence provided and fixed on the upper surface of the top plate working portion 6, 16 is a vertical member fixed to each corner of the safety fence 15, and 17 is a worker's The cross member 17a of the safety fence 15, which is formed approximately at the waist level and parallel to the top plate working portion 6 and is connected to the vertical member 16 at the corner, is disposed on the front ladder portion 2a side so as to be freely opened and closed. The movable handrail portion 17b is a fixing means formed at one end of the movable handrail portion 17a and rotatably fixed to the vertical member 16, and 17c is a movable hand. A hook portion 17d is formed at the other end portion of the sliding portion 17a and is hooked on the hook portion 17c. A hook portion 17d is formed on the other end portion of the movable handrail portion 17a and is provided on the opposed vertical member 16. A stepping-off prevention unit fixed at a height of 3 to 20 cm from the upper surface of the top plate working unit 6 to the vertical member 16 of the safety fence 15 by welding or the like.

  2, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 19 denotes a vertical member fixing portion formed by a frame member or a hollow tube into which the lower portion of the vertical member 16 of the safety fence 15 fixed to the front and rear of the support plates 7a and 7b is inserted and fixed by bolts or the like, and 20 denotes a support. A pipe-shaped rotating portion that rotatably accommodates a connecting shaft 21 fixed to the plates 7a and 7b, the rotating portion 20 has a top portion of the vertical member 3 of the rear ladder portion 2b fixed by welding or the like, and a rear ladder portion. 2b is rotatably held. Reference numeral 22 denotes a fixing portion such as a bolt fixing both ends of the connecting shaft 21 to the support plates 7a and 7b, and reference numeral 23 denotes a fixing screw fixing the lower portion of the vertical member 16 of the safety fence 15 to the vertical member fixing portion 19.

Here, as the material of the vertical member 3 and the horizontal rail 5 of the front and rear ladder parts 2a and 2b, the safety fence 15, and the step-off prevention part 18, a rod-shaped or pipe-shaped member made of a metal material such as aluminum or light alloy is used. Can be Further, as the top plate working unit 6 and the staircase unit 8, a plate member such as a metal plate of aluminum or iron, a synthetic resin plate, or an FRP plate is used. The top plate working unit 6 and the staircase unit 8 can be prevented from slipping by using a striped plate having a plurality of striped projections formed on the surface as a slipper, thereby improving safety during work.
When the vertical members 3 on both sides of the front ladder part 2a are slightly curved outward from the center, the installation surface is widened, and the swinging and falling of the simple scaffolding stepladder 1 to the left and right during work can be prevented.

The top plate working part 6 is formed in an equilateral trapezoidal or quadrangular shape and is fixed by welding to a frame material erected on the top of the front ladder part 2a or welded to a metal pipe material covered with a metal rod. Or fixed to the side or top of the support plates 7a, 7b.
Although the support plates 7a and 7b are made of metal plate members, they may be made of metal frame members.
The stairs 8 need not be provided on all the horizontal rails 5, 5a to 5d of the front ladder 2a, but may be provided on the horizontal rails of the necessary stairs. The weight can be reduced.
The step portion 8 is formed by bending a single metal plate into a step shape or integrally forming an FRP plate. It is excellent in productivity and can increase strength.
Also, by forming one or more openings in the kick-up plates 9a to 9d of the staircase 8, the stepladder 1 can be reduced in weight, and handling and transportability can be improved. The openings may be formed in the treads 8a to 8d, or punching metal or the like having a large number of holes may be used instead of the openings.

  The staircase reinforcing portion 10 is made of a long plate-like member made of a metal such as stainless steel or aluminum or an engineering resin. The stair reinforcing portions 10 and 10 have the tops fixed to the supporting plates 7a and 7b, the middle portions are fixed to the contact surfaces on the side portions of the stairs 8, the bases are fixed to the vertical members 3 and 3, and the vertical members 3 and 3 of the front ladder portion 2a. 3 are fixed substantially in parallel at predetermined intervals. Thereby, the rear side portions of the stair portion 8 are firmly held by the stair reinforcing portions 10, 10, so that the robustness can be increased and the safety can be secured.

The open state holding member 11a and the open state holding member 11b are connected to each other at the holding member shaft attaching portion 12 so as to be bent. Thus, when the operator closes the front and rear ladder portions 2a and 2b, the operator only has to operate the opening preventing piece 12b alone, and the operability is excellent.
The inclination angle with the installation surface of the front ladder portion 2a is set to 50 ° to 80 °, preferably 60 ° to 70 °, and the inclination angle with the installation surface of the rear ladder portion 2b is 65 ° to 90 °, preferably Is preferably set to 70 ° to 85 °.
It is preferable that the depth of the treads 8a to 8d of the stair portion 8 is set to 220 mm to 280 mm, and the interval between the treads 8a to 8d (the interval between the horizontal rails 5a to 5e) is set to 310 mm to 420 mm.
Thereby, the simple scaffolding stepladder 1 can be stably installed, and the worker can safely and easily go up and down the stairs 8 and can take a sufficiently large area of the tread plates 8a to 8d. The work can be performed in a stable posture on the tread plates 8a to 8d, and since the tread plates 8a to 8d are sufficiently wide, the work can be performed smoothly by placing various working tools and the like.

The safety fences 15 are formed on four sides of the top plate working unit 6 or on three sides except the front ladder part 2a. The height is adjusted so that the cross member 17 is about the waist of an adult. When formed on three sides except the front ladder part 2a, the movable handrail part 17a having the fixing means 17b, the hook part 17c, and the hook part 17d between the vertical members 16 on both sides on the front ladder part 2a side. May be installed.
The step-off preventing portion 18 is formed by fixing a metal material to the vertical member 16 of the safety fence 15 by welding or the like on the four sides of the top plate working part 6 or on three sides excluding the front ladder part 2a with a height of 3 to 20 cm. You.
In the case where the top plate working unit 6 is a square or a rectangle that is long in the front and back, the safety fence 15 and the step-off preventing unit 18 may be formed in the shape of an equiped base with the front ladder part 2a side being a lower base. In this case, the center of gravity of the rear ladder portion 2b side approaches the center of the simple scaffolding stepladder even during the work, so that the stability at the time of work can be enhanced and the fall accident can be prevented.
The rotating portion 20 is configured such that a male screw portion of a bolt is inserted into a bolt insertion hole of each of the support plates 7a and 7b through a washer, and an adjusting nut is screwed into the male screw portion through a washer, thereby forming the support plate 7a. , 7b are rotatably connected to each other, and by appropriately adjusting the amount of tightening by the adjustment nut, a gap is not formed between the support plates 7a, 7b to prevent rattling, and the installation stability of the stepladder 1 can be prevented. Excellent. Further, by screwing a grooved lock nut from above the adjustment nut, the adjustment nut can be prevented from loosening.

The method of using the simple scaffold / stepladder 1 according to the first embodiment configured as described above will be described below with reference to FIGS. 1 and 2.
In order to install the simple scaffolding stepladder 1 in the work place, the front and rear ladder portions 2a and 2b were opened from the closed state until the open state holding members 11a and 11b became substantially linear, and were installed on the tread plate 8a and the like. While checking the level 16, adjustment is performed so that the upper surface of the top plate working unit 6 is horizontal. The worker goes up and down the horizontal rail 5 and the stairs 8 of the front ladder portion 2a of the installed simple scaffolding stepladder 1, and performs work on the top work section 6 and the step boards 8a to 8d. Place materials such as tools, nails, screws, etc. on, for example, the tread plate 8d or the top plate work unit 6, perform work with the top plate work unit 6 or the tread plate 8d, and do not go up and down to replace another tool etc. on the way. Work can be performed smoothly.

  In order to fold the simple scaffolding stepladder 1, the front and rear ladder portions 2a and 2b are closed while raising the opening prevention piece 12b and bending the open state holding members 11a and 11b. Approach until it comes into contact with the horizontal rail 5 of the section 2b.

Since the simple scaffolding stepladder 1 according to the first embodiment is configured as described above, it has the following operation.
(1) Since the top work section 6 is wide, work can be performed on the top, and work at a higher place can be performed more easily than in the conventional stepladder, and the work range can be expanded.
(2) Since the top plate working unit 6 has the safety fence 15 and the step-off prevention plate 18, even if the working direction as a scaffold is expanded to 360 degrees, the worker has no danger of falling and can work with peace of mind. Compared with the conventional stepladder, which can work only about 180 degrees in front of the worker, the working range and the working amount can be greatly increased, and labor saving and workability are excellent.
(3) When the top work section 6 or the top work section 6 is rectangular, the safety fence 15 and the step-off prevention plate 18 are formed in the shape of an equiped trapezoid so that the rear ladder portion 2b side is narrow, so that a simple scaffold can be used even during work. Since the position of the center of gravity of the dual-purpose stepladder 1 is hardly fluctuated, inclination and wobble are reduced, and stability during work is improved.
(4) Since the front ladder portion 2a includes the stair portion 8 having the tread plates 8a to 8d and the kick-up plates 9a to 9d, the operator can use a tread surface wider than the top plate working portion 6 and the normal horizontal rail. It is possible to work at a high place in a stable posture by riding on the tread plates 8a to 8d having the vertical members 3 and 3 as a preventive member, and to prevent the foot from being removed, and the worker has no danger of falling down, It is not necessary to pay extra attention due to anxiety about falling, and workability and safety are excellent.
(5) Since the safety fence 15 on the side of the rear ladder portion 2b becomes a handrail, it is possible to lean out and perform work at a high place, thereby improving workability.

(Embodiment 2)
FIG. 3 is an overall perspective view of the simplified scaffold / stepladder according to the second embodiment, FIG. 4 is a plan view of a main part showing a top plate working unit, and FIG. 5 is a longitudinal section of a main part of the stepladder according to the second embodiment. FIG. 6 is a front view of the one-legged free leg. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.
3 and 4, reference numeral 1a denotes a tripod-type simple scaffold combined use stepladder according to the second embodiment, 6a denotes a top plate working section formed in an equal leg trapezoid shape, and 15a denotes a safety fence formed in an equal leg trapezoid shape. , 16a is a mountain-shaped vertical member having an interval formed to be narrower than the vertical member 16 of the front ladder portion 2a and the upper portion is formed in a mountain shape at the waist level, and 17e is inclined so that the rear ladder portion 2b side is higher. The inclined cross member of the formed safety fence 15a, 18a is a step-off preventing portion formed in a shape of a trapezoid, 30 is an opening for lightening drilled in the kick-up plates 9a to 9d, and 41 is an upper end. Is made of a pipe-shaped member made of a metal material such as aluminum or light alloy and fixed to a substantially middle portion of the rotating portion 20 by welding or the like and rotatably disposed on the top plate working portion 6 and penetrated through the front and rear walls. A supporting leg 41a having a supporting leg hole (not shown), and a lower portion of the supporting leg 41 and the supporting leg 41a. The two short tube telephones formed with two short tube telephones, each of which is fitted and fixed in two places above and each has a locking material hole communicating with a support leg hole (not shown), 42a and 42b are: A pair of reinforcing members 43 are installed diagonally from a predetermined portion near the upper end portion of the support leg portion 41 to near both end portions of the rotating portion 20, and 43 is inserted into the support leg portion 41 and is made of a short pipe or the like and formed by welding or the like. 43a is a plate-like projection provided on the front ladder portion 2a side of the support leg fixing member holding member 43, and 44 is a hole 44a of the plate-like projection 43a. Is a one-legged free leg that is rotatably arranged at one end, 45 is a one-legged free leg that is inserted into the support leg 41 from below and adjusts the length of the rear ladder 2b. A fixing hole 47 for fixing a lower portion of a plurality of support legs 41 formed through the front and rear walls at equal intervals of 3 to 5 cm in the upper side portion of the adjustable leg 45; Is a locking member such as a fixing screw which penetrates through the supporting leg hole of the wear preventing material 41a and a predetermined fixing hole 46 and is screwed with a nut to adjust the insertion length of the supporting leg 41; A ground contact portion of the foot-like adjustable leg 45, a pile hole 49 for driving a pile for fixing the support leg portion 41 to the ground, and a mounting surface fixing portion 50.

In FIGS. 5 and 6, reference numeral 44 denotes a plate-like support leg fixing portion disposed between the front ladder portion 2 a and the plate-like projecting portion 43 a of the support leg portion 41, and reference numeral 44 a denotes a distal end side of the support leg fixing portion 44. Holes 51 for adjusting the degree of opening of the support legs 41 in accordance with the state of the installation surface X, 51 is a fixing member vertically suspended and fixed at the center of the lower surface of the tread plate 8b, and is supported on the tip side. An engagement hole such as a screw hole (not shown) screwed to the leg fixing portion 44 is formed. Reference numeral 52 denotes a locking member such as a thumb screw attached to the locking hole of the fixing member 51 through the hole 44 a at the tip of the support leg fixing portion 44, and reference numeral 53 denotes a pile driven into the pile hole 49 of the grounding portion 48.

The support leg 41 has a single foot-shaped free leg 45 inserted into the support leg 41 for a predetermined length according to the installation location of the simple scaffold stepladder 1a, and engages with the support leg hole and the fixing hole 46 of the support leg 41. The stopper 47 is inserted and fixed.
In addition, one leg-shaped free leg 45 may be inserted and provided also in the lower part of each vertical member 3, 3 of the front ladder part 2a. Thus, by simply adjusting the length (height) of the three single leg-shaped free legs 45, it is possible to keep the top plate working unit 6 horizontal even on uneven terrain such as sloping terrain or uneven terrain. it can.

The method of using the simple scaffold / stepladder of the second embodiment configured as described above will be described below.
(1) If the work site is uneven and has a step or an inclination, insert a single leg-shaped free leg 45 from the lower end of the pipe-shaped support leg 41 so that the upper surface of the top plate working unit 6 is horizontal. While looking at the level 13, the length of the single leg-shaped free leg 45 is adjusted.
(1) The support leg fixing portion 44 is fixed with a locking member 44a such as a screw.
(2) The pile is driven into the hole 49 and fixed.

As described above, since the simple scaffold and stepladder of the second embodiment is configured, the following effects can be obtained.
(1) The fixing of the support leg 41 and the single leg-shaped free leg 45 is performed by fixing the support leg hole to the front and rear of the tube wall of the support leg 41, the hole of the wear preventing material 41a, and the fixing hole. The supporting leg 41 can be adjusted to a predetermined length only by inserting and inserting the locking member 47 such as a bolt into the 46.
(2) With the simple fixing work of the support leg 41 and the single leg-shaped free leg 45, the top plate working unit 6 can be kept horizontal even on uneven terrain having a step or an inclined surface.
(3) Since the support leg 41 moves back and forth, positioning can be easily performed even on uneven terrain.
(4) Since it has the angled vertical member 16a and the inclined horizontal member 17e slightly inclined on the rear side, it is possible to work by grasping the top of the angled vertical member 16a with one hand and leaning on the body, and furthermore, the inclined horizontal member 17e and the front ladder portion 2a. Since it is inclined to the side, the work can be performed smoothly without the safety belt and various tools hung on the waist from being caught.
(5) Since the top plate working part 6 is formed in an equilateral trapezoidal shape, the working range on the rear side is limited to the center side, so that the center of gravity does not move and the inclination and wobble of the simple scaffolding stepladder 1A are prevented. be able to.

(Embodiment 3)
FIG. 7 is a rear perspective view of the simple scaffold / stepladder according to the third embodiment, FIG. 8 is a front view of the forked free leg, and FIG. 9 is a sectional view of a main part of the simple scaffold / stepladder.
The simplified scaffolding stepladder 1b of the third embodiment differs from the first and second embodiments in the following points. The vertical member 3a of the front ladder portion 2a is slightly bowed in the left-right direction below the center to prevent swaying and rollover to the left and right, thereby enhancing safety. The point that one foot-shaped free legs 45a and 45b capable of adjusting the length of the vertical member 3a are provided below the vertical member 3a. The point is that a forked free leg 60 is provided below the support leg 41. Next, the forked free leg 60 will be described with reference to the drawings.
7 to 9, reference numeral 60 denotes a bifurcated free leg made of a metal material such as aluminum or iron, and 61 denotes an insertion portion inserted and fixed to a lower portion of a support leg 41 formed of a plate material or a pipe material. It is. Reference numeral 62 denotes a plurality of fixing holes provided at the front and rear of the tube wall of the insertion portion 61 at equal intervals of 3 to 5 cm so that the height can be adjusted to an arbitrary height. Reference numeral 63 denotes a forked portion fixed to the insertion portion 61 by welding, 64 denotes a joining portion where the top portion of the insertion portion 61 and the forked portion 63 are joined by welding, 65 denotes an installation surface biting portion, and 66 denotes a reinforcement for the forked portion 63. The bifurcated side beam, 67 is a pile.

Next, a method of using the simple scaffold / stepladder of the third embodiment will be described.
If the installation surface of the simple scaffolding stepladder 1b is uneven and sloping, or if there is a step such as stairs, the supporting leg is set according to the height difference of the installation surface between the vertical members 3a, 3a of the front ladder 2a. The lengths of the portions 45a and 45b are adjusted so that the left and right sides are horizontal while looking at the level 13, and the vertical members 3a and 3a and the support legs 45a and 45b are fixed with a locking member 47 such as a screw. Next, the length of the mounting portion 61 of the bifurcated free leg 60 of the support leg portion 41 is adjusted so that the front and rear are horizontal while looking at the level 13, and the insertion hole is provided at a position where the top plate working portion 6 is kept horizontal. The locking member 47 is inserted and fixed in the portion and the screw hole portion 62.

As described above, since the simple scaffold and stepladder of the third embodiment is configured, the following effects are obtained.
(1) By removing the rear ladder part from the supporting leg part rotating connection part and replacing it with the supporting leg part, it can be used as a tripod and can be used for interior construction work of a building or pruning work.
(2) By installing one auxiliary leg free leg on each vertical member of the front ladder part 2a, even if the installation surface is sloped or stair-shaped, it can be easily installed, and the adaptation point of the installation surface is wide and convenient. Excellent in nature.
(3) Since the bifurcated free leg is formed bifurcated, it becomes a quadruple, maintaining a stable posture as compared to a tripod, and is excellent in stability.
(4) By adjusting the fixing screw hole and the insertion portion, even if the installation surface is inclined or stair-like, the installation surface can be easily installed, and the installation surface can be widely applied and excellent in convenience.
(5) Even if the installation surface is inclined or stair-like, the top plate working section can always be kept horizontal.

  Next, the difference between the simple scaffold and stepladder of the present application and a known stepladder will be described with reference to a comparison table in (Table 1). As is clear from (Table 1), it can be seen that the simple scaffold / stepladder of the present invention almost solved the problems of the conventional stepladder which is commercially available. In addition, the applicant's Patent No. 3,821,836 solves most of the problems with conventional stepladders on the market, but a. Workability on uneven terrain and b. Switchability between tripod and quadruped. And c. There was a problem that the adjustability of the length of the entire length was lacking, but the simple scaffold and stepladder of the present application could also solve all of these problems.

(Embodiment 4)
FIG. 10 is a schematic diagram showing a state in which a simple scaffold is formed using two simple scaffolds and stepladders according to the fourth embodiment.
1 to 9 are denoted by the same reference numerals, and description thereof will be omitted.
In FIG. 10, reference numeral 70 denotes a simple scaffold combined with the simple scaffold / stepladder 1, 1b, and the stairs 8 are opposed to each other, and 71 is a simple scaffold provided and set on the installation surface Xa made of uneven terrain. 1b is a scaffold plate of the simple scaffold 70 provided between the tread plates 8c of the respective staircase portions 8 facing each other.

Since the simple scaffold of Embodiment 4 is configured as described above, it has the following operation and effects.
(1) Place each stair 8 side of the simple scaffolding stepladder 1, 1b at the length of the scaffold board 71, face each other, drive a pile into each pile hole, and pass the scaffold board 71 between the treads 8c of each stair section 8. By simply installing, a stable simple scaffold 70 without rattling during the operation can be easily set up.
(2) The conventional scaffold can be used only on level ground where the tread surface is leveled with two conventional stepladders facing each other. However, the simple scaffolding combined stepladder of the present invention has a single foot-shaped free leg or a bifurcated free leg. The simple scaffold can be installed horizontally and stably on any uneven terrain.
(3) When assembling at the same height as in Embodiment 4 using a conventional picket scaffold, four jackie bases, four posts, four rolls, two scaffold plates, and eight scaffold plate lock plates However, when assembling using these, a large number of materials and man-hours were required from transportation to assembling work by two people. Can be installed by one person and with extremely few members, with a simple operation, in an extremely short time, and is excellent in workability of the installation operation.
(4) With the conventional picket scaffold, it was impossible to change the height of the scaffold plate freely in a short time and alone by the user, but according to the simple scaffold of the present embodiment, The height of the scaffold plate can be freely changed by simply moving one simple scaffold and stepladder and laying the scaffold plate between the tread plates 8a and the like having a predetermined height. Excellent efficiency.

  The present invention has a wide top work section serving as a scaffold, and has a safety fence and a step-off prevention section for preventing an accident of stepping off on the top work section, so that work is performed in a 360-degree work direction. It is not only possible to greatly increase the amount of work compared with the conventional stepladder work, it is also possible to work at high altitude safely and safely, and when working at higher altitudes By simply adjusting the lengths of the front and rear ladder portions and the adjustable legs of the support leg portions, it is possible to cope with one simple scaffold and stepladder. In addition, by using one-legged and two-legged free legs, the top plate work section and stairs can be kept horizontal, and work can be performed on sloping terrain, stepped terrain, irregular terrain where conventional work was impossible. To provide a simple scaffolding stepladder that can be used as a simple scaffolding by improving the workability and facing the two simple scaffolding stepladders by simply leveling the top board work section and placing the scaffolding board. It is a useful invention that can be done.

FIG. 2 is an overall perspective view showing a state where front and rear ladder portions of a simple scaffold and stepladder according to the first embodiment are opened. (A) is a plan view of the top plate working unit in the first embodiment, and (b) is a central cross-sectional view of the top plate working unit side in the first embodiment. Overall perspective view of a simple scaffolding stepladder according to the second embodiment. Principal part plan view showing the top plate working unit Longitudinal sectional view of a main part of a simple scaffold combined stepladder according to the second embodiment. Front view of one leg Rear side perspective view of the simple scaffold / stepladder of Embodiment 3. Front view of bifurcated free leg Sectional view of main part of simple scaffold combined stepladder Schematic view showing a state in which a simple scaffold is formed using two simple scaffolds and stepladder of the fourth embodiment.

1, 1a, 1b Simple scaffold / stepladder 2a Front ladder part 2b Rear ladder part 3 Vertical member 4 Installation surface fixing part 5 Horizontal beam 6 Top work part 7 Rotating connection part 7a, 7b Support plate 8 Step part 8a to 8d Step plates 9a to 9d Kick-up plate 10 Stair reinforcing portions 11a, 11b Opening holding material 12 Holding material shaft attaching portion 12a Opening prevention piece 13 Level 14 Cross beam support reinforcing portion 15, 15a Safety fence 16 Vertical member 16a Vertical member 17 Cross member 17a Movable handrail portion 17b Fixing means 17c Hook portion 17d Hook portion 17e Inclined cross member 18, 18a Detachment prevention portion 19 Vertical member fixing portion 20 Rotating portion 21 Connecting shaft 22 Fixed portion 23 Fixing screw 30 Opening 41 Support leg Part 41a Wear prevention material 42a, 42b A pair of reinforcing materials 43 Support leg fixing part holding material 43a Plate-shaped protruding part 44 Support leg fixing part 45 One leg-shaped free leg 46 Fixing hole 4 7 Locking material 48 Installation surface fixing part 49 Pile hole 50 Installation surface fixing part 51 Fixed member 52 Thumb screw 53 Pile 55 Fixed screw hole 60 Bifurcated free leg 61 Mounting part 62 Fixed hole 63 Bifurcated part 64 Joint part 65 Installation Surface cut-in part 66 Bifurcated side beam X, Xa Installation surface

Claims (3)

A front ladder portion having two vertical members and a plurality of horizontal rails laid therebetween, and a square or rear portion having a front portion or a side portion fixed to an upper end of the front ladder portion is formed at a lower bottom. An isosceles trapezoidal top work section, and a single leg supporting leg or two vertical members rotatably mounted on the rear of the top work section via a rotation section, and A rear ladder portion having a plurality of erected cross rails, and a square or fixed-foot trapezoidal safety fence having a rear portion formed on a lower bottom fixedly or detachably fixed to at least three surfaces of the top plate working portion. And a stepping-off preventing unit having a square or rear portion formed on a lower bottom and disposed on at least three surfaces around the top plate working unit and having a stepping-off preventing shape.   A rotary connecting portion that connects the support leg to a rear portion of the top plate working unit so as to be openable and closable; a plate-shaped protrusion provided on a predetermined portion of the support leg; and a plate-shaped protrusion. A support leg fixing portion rotatably fixed, and the other end of the support leg fixing portion is detachably attached to the horizontal rail or the vertical member that horizontally supports the top plate working portion. 2. The simple scaffolding stepladder according to claim 1, further comprising a locking portion for locking. Each of the vertical members and the support legs of the front ladder portion and / or the rear ladder portion is formed of a pipe material or a square-shaped member, and is inserted or attached to a lower end of each of the vertical members or the support legs. The simple scaffold / stepladder according to claim 1 or 2, further comprising a single-leg or bifurcated free leg fixed at a predetermined length.

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