JP2002194981A - Stepladder and ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stepladder and a ladder appropriately used both as a stepladder and a ladder, or used only for a stepladder or a ladder in which the number of necessary components is reduced to simplify the structure so that the stepladder/ladder can be made at low cost, stability of the stepladder/ ladder is improved, and which prevent turn-over of the stepladder/ladder, secure safety at actual use, promote effective work on a top-board of the stepladder, improve convenience of use of the ladder, and easily meets conversion of the existing stepladder/ladder, in addition, which can be compactly folded at the supporting legs, and when they are placed one upon another for keeping, the steps can be protected. SOLUTION: A stepladder and a ladder are provided with a pair of leg bodies 1 comprising a pair of posts with steps installed thereon. The pair of leg bodies 1 are jointed with a pivot 6 but they are freely rotatable. The stepladder and the ladder are also provided with a pair of supporting legs 28 for supporting both sides of the leg bodies 1. The supporting legs 28 are jointed to the pivot 6 but they are freely rotatable. The end of the supporting legs 28 can be set on the ground surface 33 between the pair of leg bodies 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for, for example, a stepladder / dedicated stepladder, a dedicated stepladder, and a dedicated ladder, and can be manufactured at low cost with a reduced number of parts and a simple structure, and improves the stability of the stepladder and the ladder. Prevent falls and ensure safety in use,
Encourages work on the top of the stepladder, improves the convenience of using the ladder, easily adapts to existing stepladders and ladders, and folds and stacks the reinforcing legs compactly when not in use. The present invention relates to a stepladder and a ladder capable of protecting a step during storage.

[0002]

2. Description of the Related Art In a conventional stepladder, for example, a plurality of steps are spanned between a pair of right and left columns, and a top plate is attached to an upper end thereof to form a leg, and the upper ends of the pair of legs are turned. They are movably connected and foldable, and at the time of use, an opening stopper is hung on the upper end of the leg to prevent the leg from expanding.

However, this conventional stepladder has a problem in that it is generally weak to swing in a direction orthogonal to the facing direction of the legs, that is, in the left-right direction of the legs, and tends to fall in the same direction. Therefore, work on the top plate of the stepladder was stopped from the viewpoint of safety, and the use of a stepladder alongside the scaffolding board on those topplates was also restrained, impairing the effective use of the stepladder. .

[0004] Therefore, as a solution to the above problem, for example, Japanese Patent Application Laid-Open No.
Auxiliary columns are attached to both columns of one leg, the upper ends of the auxiliary legs are rotatably mounted on the columns, and the lower ends are grounded to the sides of the columns, between the auxiliary legs and the auxiliary columns. The locking rod was hooked to prevent the stepladder from falling to the side.

However, in this conventional stepladder, since one leg is supported by the auxiliary leg, there is anxiety when the other leg is used, and even when the leg is used, the auxiliary leg is supported. Since the position differs from the position of the center of gravity of the stepladder, there has been a problem that a sufficient fall prevention effect cannot be obtained. Therefore,
It is conceivable that the other leg is supported by a similar auxiliary leg.However, this would increase the number of parts and increase the complexity and cost. And so on.

[0006] Conventionally, there is a ladder / ladder which can be used as a ladder by expanding a pair of legs and connecting them on the same plane, and the auxiliary leg is provided at the same position as the ladder / ladder. Is attached, and the lower leg is supported by the auxiliary leg. However, in this case, the ladder can prevent the ladder from falling in the left-right direction, but cannot prevent the leg body from bending in the opposite direction or swinging in the same direction, and thus cannot obtain stability in use. .

[0007]

The present invention solves such a problem, and is suitable for, for example, a ladder combined stepladder, a dedicated stepladder, and a dedicated ladder. The number of parts can be reduced, and a simple configuration can be manufactured at low cost. Improve the stability of the ladder, prevent its fall, ensure the safety of use, promote the work on the top plate of the stepladder, and also improve the convenience of use of the ladder,
It is an object of the present invention to provide a stepladder and a ladder which can be easily adapted to existing stepladders and ladders, and which can fold the reinforcing legs compactly when not in use and which can protect the steps during stacking and storage.

[0008]

For this purpose, the invention of claim 1 has a pair of legs each having a pair of right and left columns on which a step is erected, and the pair of legs is rotated via a pivot. In a stepladder having a pair of left and right reinforcing legs movably connected and supporting both sides of the leg body, a pair of left and right reinforcing legs is rotatably connected to the pivot, and an end of the reinforcing leg is The stability of the stepladder can be improved, the fall of the stepladder can be prevented, and the safety in use can be increased as compared with a conventional reinforcing leg that can be installed on the grounding surface between the legs and supports one leg. In addition, the number of parts is reduced and the configuration is simpler than that of a structure in which a pair of legs is provided with a pair of reinforcing legs, so that it can be manufactured at a low cost, and the reinforcing legs can be attached to the existing pivot. It is easy to adapt to the modification of the existing stepladder.

According to a second aspect of the present invention, the reinforcing legs can be installed on the outer ground contact surface between the legs, the stability of the stepladder is further improved, and the prevention of the falling of the stepladder is enhanced to enhance the safety in use. According to a third aspect of the present invention, the position of the end of the reinforcing leg can be adjusted inward and outward of the ground contact surface between the legs, so that the installation state of the reinforcing leg can be accurately determined in accordance with the use environment and work conditions of the stepladder. It is settable. According to a fourth aspect of the present invention, a supporting bracket is rotatably connected to the pivot, an upper end of the reinforcing leg is rotatably and swingably connected to the supporting bracket, and the reinforcing leg is formed of two members. Mechanism is realized.

According to a fifth aspect of the present invention, the support bracket and the upper end of the reinforcing leg are detachably connected to each other so that the position of the reinforcing leg can be changed when the engagement is released, and the reinforcing leg is engaged when the engagement is performed. Is maintained so that a stable installation of the stepladder can be obtained. The invention according to claim 6 is characterized in that a leg holder capable of holding a reinforcing leg is provided at a predetermined step of each leg, and the reinforcing leg is arranged between the folded legs, and a stepladder is compactly folded. The stepladder is stored in a stacked state, and the step is prevented from being deformed during the stacking. The invention according to claim 7 is such that the pair of legs are connected on the same plane, the reinforcing legs protrude downward from the connecting portion in a direction intersecting with the plane of the legs, and the ends of the reinforcing legs are installed on the ground surface. It is possible to make it suitable for a stepladder that also serves as a ladder.

[0011] The invention according to claim 8 is a ladder having a leg in which a plurality of steps are erected on a pair of right and left columns, and having a pair of left and right reinforcing legs supporting both sides of the leg. A pair of left and right reinforcing legs are rotatably connected in the vertical direction to a central portion in the length direction via a pivot, and the reinforcing legs are disposed below the plane of the leg body in a direction crossing the leg body, and the ends of the reinforcing legs are It can be installed on the ground surface below the leg, and compared to the conventional reinforcing leg that supports the leg from the side, it prevents bending of the ladder and swings up and down, improving stability and improving Increase safety. Moreover, by connecting the reinforcing legs to the center of the leg in the longitudinal direction, the number of parts is reduced and the configuration is simplified as compared with a structure in which the reinforcing legs are provided at both ends of the leg. Since it can be manufactured at low cost and the reinforcing legs need only be attached to the pivot, it can be easily adapted to modifications of existing ladders.

According to a ninth aspect of the present invention, the reinforcing legs are erected vertically or obliquely to stably and firmly support the ladder. According to the invention of claim 10, a pair of legs are connected to each other on the same surface, and the legs can be used upside down.
The reinforcing legs can be inverted and installed on the installation surface to improve convenience in use, and by connecting the pair of legs rotatably, the pair of legs is not used when the ladder is not used. The legs can be folded compactly.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a ladder-type stepladder according to an embodiment of the present invention; FIG. They are configured substantially identically. The leg 1 is a column 2 made of aluminum square tube arranged in a pair on the left and right.
And a plurality of trapezoidal tubular steps 3 spanned between the columns 2, 2, and a top plate 4 attached to the upper ends of the columns 2, 2. In this case, the support 2 and the step 3 may be configured by a round pipe.

Hinge fittings 5 and 5 are attached to the upper end side surfaces of the columns 2 and 2, and the hinge fittings 5 and 5 are rotatably connected via pins 6 and 6, which are pivots. Latches 7 and 8 are detachably hung between the lower ends of the hinges 5 and 5, and the latch 7 is rotatably connected to one hinge 5 via a pin 9. The latch 7 is connected to the tip of the
0 so as to be rotatable.

A through hole 11 is formed at the tip of the latch 8 so that the hole 11 can be latched to lock pins 12 and 13 protruding from the other hinge 5.
Of these, the lock pin 12 is disposed at the lower end of the hinge fitting 5 to prevent the columns 2, 2 from spreading when the stepladder is used, and the lock pin 13 is disposed above the pin 12 when the ladder is used. The columns 2, 2 can be prevented from bending.

In the figure, reference numeral 14 denotes a telescopic leg which is slidably accommodated in the inside of the column 2 and provided with adjusting devices 15 at both ends of the step 3 at the lowest position. , The length of protrusion from the column 2 can be adjusted and locked. Reference numeral 16 denotes a grounding tool rotatably attached to the lower end of the telescopic pillar 14.

Inside the hinge fittings 5, 5, support fittings 17, 17 constituting reinforcing legs, which will be described later, are arranged to face each other, and the upper ends of the fittings 17, 17 are turned via the pins 6.6. It is movably connected. The support bracket 17, 17
A braking member 18 such as a spring washer or a coil spring is interposed on one side or both sides, and the elasticity of the braking member 18 controls the rotation and swinging movement of the support bracket 17 by braking. In the figure, reference numeral 19 denotes a nut screwed into a screw shaft end of the pin 6.

The support member 17 has a substantially L-shaped cross section, and a bent piece 20 is formed at the lower end thereof.
An upper end of a connecting metal member 21 constituting a reinforcing leg described later is rotatably and swingably connected via a pin 22.

The connecting fitting 21 is formed in a substantially L-shaped or F-shaped cross section, and a bent piece 23 is formed at the upper end thereof.
The bent piece 23 is disposed immediately below the bent piece 20.
A braking member 24 such as a spring washer or a coil spring is interposed between the bending pieces 20 and 23 or on both sides of the bending piece 23, and the elasticity of the braking member 24 controls the rotation and the swinging movement of the connection fitting 21 by braking. In the figure, reference numeral 25 denotes a nut screwed into the screw shaft end of the pin 6.

The connecting fitting 21 is attached obliquely downward toward the side of the leg 1 as shown in the figure, and has a reinforcing leg 28 connected to an inner surface thereof via a bolt 26 and a nut 27. The reinforcing leg 28 is made of a square tubular material having the same shape and the same cross section as the column 2, and slidably accommodates a telescopic column 29 constituting the reinforcing leg 28 therein. The length of the projection from the column 2 can be adjusted and locked.

In addition, in the figure, 31 is a rubber grounding tool attached to the lower end of the telescopic leg 29, and 32 is attached to the inner surface of the leg 1, 1 on the end side of the predetermined step 3, 3. This is a leg holder having a substantially U-shaped cross section.
Can be pinched. Reference numeral 33 denotes a ground surface or a floor surface serving as a ground surface, and reference numeral 34 denotes a reinforcing portion formed at a bent portion of the support bracket 17.

In this embodiment, the connecting metal fitting 21 is attached to the reinforcing leg 28, and the supporting metal 17 is attached to the connecting metal fitting 21.
However, it is also possible to configure them with the same member having a predetermined strength and flexibility, and to configure them so that they can rotate and swing, so that the number of parts can be reduced. And the configuration is simplified. In addition, although the connecting fitting 21 is attached to the reinforcing leg 28, it can be configured as a single reinforcing leg 28, and by doing so, the number of components is reduced and the configuration is simplified. In practice, a configuration in which the support bracket 17 is connected to the reinforcing leg 28 alone is adopted.

The ladder and stepladder thus constructed requires, in addition to the conventional stepladder, a pair of supporting brackets 17, a connecting bracket 21, and reinforcing legs 28 and a leg holder 32. These constructions are very simple. The production also bends the steel plate into a substantially U-shape or a U-shape, and cuts a commercially available tube to a predetermined length,
Since it is sufficient to provide through holes at those predetermined positions, it can be manufactured easily and at low cost.

Next, when assembling the stepladder of the present invention using these components, the pins 6 and 6 of the conventional stepladder are removed, and the supporting bracket 17 is inserted into both ends between the top plates 4 and 4. These are positioned on the inner surface of the hinge fitting 5 and are opposed to each other. Then, the pin 6 is inserted into the hinge fittings 5, 5 and the support fitting 17, and a nut 19 is screwed into a screw shaft end thereof via a spring washer 18, and these are tightened together to adjust the rotation operation of the support fitting 17. I do.

After the mounting of the support bracket 17, when attaching the connecting bracket 21 to the bent piece 20, a reinforcing leg 28 is previously attached to the connecting bracket 21, and the bent piece 23 is superimposed on the bent piece 20. The pin 22 is inserted with the spring washer 18 interposed therebetween. And pin 2
A nut 19 is screwed into the end of the screw shaft 2 via a spring washer 18, and these nuts are tightened together to adjust the turning operation and the swinging operation of the connection fitting 21.

If necessary, the extension leg 1 may be attached to the reinforcing leg 28.
The leg holders 32, 32 are attached to the step rails 3, 3 of the conventional stepladder, and in the embodiment, the end side inner surfaces of the step rails 3, 3 in the second stage from the bottom.

As described above, the stepladder of the present invention can be easily assembled by using the pins 6 of the conventional stepladder, so that the existing stepladder can be easily modified as well as a new stepladder. When the stepladder of the present invention assembled in this manner is used, the legs 1, 1 are expanded as in the case of the conventional stepladder, the latches 7, 8 are latched, and the lower ends of the columns 2, 2 are grounded or grounded. Installed on the floor 33, extend the telescopic legs 14 as necessary,
Adjust its length.

After the stepladder touches the ground, the telescopic pedestal 29 is extended, if necessary, and its length is adjusted.
8 is rotated to the outside of the leg 1 by an appropriate angle, and the grounding members 31, 31 are rotated.
At the center position between the front and rear grounding members 16, 16, that is, on the horizontal extension line just below the top plates 4, 4 and on the line connecting the front and rear grounding members 16, 16, preferably on the ground at an outer position on the line. It is installed on the floor surface 33.

In this case, since the connecting bracket 21 to which the reinforcing leg 28 is fixed is swingably attached to the pin 22 and the supporting bracket 17 is rotatably connected to the pin 6, the mounting position of the reinforcing leg 28 is set. Can be adjusted back and forth and right and left within a certain range, and an accurate and stable installation state can be secured according to the use conditions of the stepladder and the grounding environment of the ground or the floor surface 33.

1 and 2 and FIG. 5, the reinforcing legs 28 and the telescopic pillars 29 are erected on the left and right sides of the leg 1 in an inclined manner. Therefore, at the time of using the installed stepladder, the left and right sides of the legs 1, 1 are supported by the reinforcing legs 28 and the telescopic legs 29, and the legs 1, 1
Since the vibration and swinging in the left and right directions are prevented, the stability of the stepladder is increased, the falling in the direction is prevented, and the safety of the work on the stepladder is improved.

As described above, the stepladder is such that the reinforcing legs 28 and the telescopic legs 29 are arranged between the legs 1, 1 and the upper ends thereof are connected to the pins 6, 6 between the top plates 4, 4. Therefore, regardless of the use of the legs 1, 1, the above-described stability and the effect of preventing falling can be obtained by the reinforcing legs 28, and the standing work on the top plate 4 can be promoted. Therefore, the stability in use is increased as compared with the conventional one in which the reinforcing leg is disposed on one of the legs and the upper end thereof is attached to the intermediate portion of the column. Moreover,
Since the leg holder 32 is provided at the end of the step 3, use of the step 3 is not hindered.

Next, after using the stepladder, one of the telescopic legs 29 is reduced via the telescopic adjustment device 30, and the reinforcing legs 28 are used.
Is rotated about the axis about the pin 22 by about 180 °, and furthermore, the support bracket 17 is rotated in the front-rear direction about the pin 6, and the reinforcing leg 28 integrated with the support bracket 17 is attached to the bent piece. It is pushed into the leg holder 32 against the elasticity. Thereafter, the other telescopic leg 28 is operated in the same manner, and the upper end of the reinforcing leg 28 is
And the support bracket 17 is rotated in the front-rear direction about the pin 6 to push the reinforcing leg 28 into the leg holder 32.

Then, the latch members 7, 8 are detached from the lock pins 12, and the legs 1, 1 are turned inward around the pins 6 to be folded, and further extended and retracted via the telescopic adjustment device 15. To shrink.

The folded state is shown in FIGS. 6 to 9, in which the pair of legs 1, 1 are folded up and down substantially in parallel, while the reinforcing legs 28, 28 are positioned substantially horizontally. , 28 are folded into a substantially V-shape on a plane without contacting each other inside the leg 1. Therefore,
The stepladder can be folded and stored compactly, and multiple stepladders can be stably stacked. In that case, the reinforcing legs 28, 28 are positioned so as to be engageable between the steps 3 to prevent bending or deformation of the steps 3 when the stepladder is stacked.

FIG. 10 shows a situation where the stepladder of the present invention is used as a ladder. In this case, the legs 1 and 1
, The top plates 4 and 4 face each other and extend in a substantially straight line, and the latch 8 is attached to the lock pin 1.
3 and hold the extended state. Thereafter, the telescopic pedestal 14 is extended to adjust the length of the ladder.
Of the lower telescopic leg 14 is appropriately selected according to the working conditions and the grounding condition, and the grounding is performed.

Before and after the leaning of the ladder, the reinforcing legs 2
8 from the leg holder 32 and their telescopic legs 29
To ground the grounding tool 31 to the ground or floor surface 33. In this case, the reinforcing legs 28 and the telescopic legs 29
Stand vertically or diagonally when viewed from the side, and position them substantially parallel as viewed from the back. This situation is as shown in FIG.

By using the ladder in this manner, it is possible to prevent the legs 1 and 1 from being bent in a direction substantially perpendicular to the column 2 when used as a ladder, and to prevent vibration and swing in the same direction. The above safety is improved. In addition, since the reinforcing legs 28 support the middle portion of the ladder that forms the maximum flexure, the above-described effect is further enhanced. Therefore, stability and safety in use are improved as compared with the conventional one that supports the left and right sides of the lower leg.

Further, since the reinforcing legs 28 are connected to the central portions of the pair of legs 1, 1, the reinforcing legs 28 can be installed even when the legs 1, 1 are used upside down. . Therefore, the convenience in use is increased as compared with the conventional one, the number of parts is reduced, the configuration is simplified, and this can be manufactured inexpensively, and the pivot 6 is attached to the center of the existing ladder. Since the reinforcing legs 28 may be attached to the pivot 6, it is possible to easily adapt the existing ladder.

FIGS. 11 to 14 show another embodiment of the present invention, and the same reference numerals are used for the portions corresponding to the configuration of the above embodiment. 11 to 13 show a second embodiment of the present invention.
Instead of forming 0,23 on a flat surface, they are formed to be engageable with each other. That is, one of the bent pieces,
In the embodiment, a substantially cross-shaped engaging projection 3 is provided on the upper bending piece 20.
5 is projected around the pin hole 36, and a substantially cross-shaped engagement groove 37 engageable with the engagement projection 35 is formed in the lower bent piece 23 centering on the pin hole 38. In the figure, 39 is a bent piece 20,
23 is a coil spring interposed between the two.

In this manner, the bent pieces 20 and 23
Is stable, preventing the displacement of the reinforcing leg 28 and stabilizing it. The engaging projection 35 and the engaging groove 37 are formed in a substantially cross shape so that their engagement and engagement can be prevented. The cancellation is smoothly and easily performed.

FIG. 14 shows a third embodiment of the present invention.
In this embodiment, a wedge-shaped slip stopper 40 is attached to the lower end of the grounding member 31 of the telescopic pillar 29, and the slip stopper 40
Is brought into contact with the ground or the floor surface 33 to enhance the frictional force and stabilize the reinforcing legs 28 to improve the stability of the stepladder and the ladder.

In each of the above embodiments, the present invention is applied to a ladder / ladder. However, the present invention is not limited to this example, and may be applied to a dedicated ladder or a dedicated stepladder.

[0043]

As described above, according to the first aspect of the present invention, a pair of left and right reinforcing legs are rotatably connected to the pivot, and the ends of the reinforcing legs can be installed on the grounding surface between the legs. As a result, the stability of the stepladder is improved as compared with the conventional reinforcing legs that support one leg, and the fall of the stepladder can be prevented, and the safety in use can be improved. Since the number of parts is reduced and the configuration is simplified as compared with a structure in which a pair of reinforcing legs are provided for each, it can be manufactured at low cost, and the reinforcing legs can be attached to the existing pivot. There is an effect that the existing stepladder can be easily modified.

According to the second aspect of the present invention, since the reinforcing legs can be installed on the outer ground contact surface between the legs, the stability of the stepladder is further improved, and the prevention of the falling of the stepladder is enhanced to enhance the safety in use. Performance can be improved. According to the third aspect of the present invention, since the position of the end of the reinforcing leg can be adjusted inward and outward of the ground contact surface between the legs, the reinforcing leg can be accurately installed in accordance with the use environment and work conditions of the stepladder. Can be. The invention of claim 4 is
Since the supporting bracket is rotatably connected to the pivot and the upper end of the reinforcing leg is rotatably and swingably connected to the supporting bracket, the reinforcing leg is composed of two members, realizing a specific mechanism. can do.

According to the fifth aspect of the present invention, since the support bracket and the upper end of the reinforcing leg are detachably connected, for example, when the engagement is released, the installation position of the reinforcing leg can be changed. At the time of installation, the installation position of the reinforcing leg is maintained, and a stable installation state of the stepladder can be obtained. In the invention of claim 6, a leg holder capable of holding a reinforcing leg is provided on a predetermined step of each leg, and the reinforcing leg is arranged between the folded legs, so that the stepladder can be compactly folded, A stable storage state of the stepladder can be realized, and deformation of the step during stacking can be prevented. The invention according to claim 7, wherein the pair of legs are connected on the same plane, and the reinforcing leg protrudes downward from the connection in a direction intersecting with the plane of the leg,
Since the end of the reinforcing leg can be installed on the ground contact surface, there is an effect suitable for a stepladder which is also used as a ladder.

According to an eighth aspect of the present invention, a pair of left and right reinforcing legs are rotatably connected to a central portion of the leg in the longitudinal direction of the leg via a pivot so as to be vertically rotatable. It is arranged below, and the end of the reinforcing leg can be installed on the ground contact surface below the leg, so that the bending of the ladder and the vertical direction are compared with the conventional reinforcing leg supporting the leg from the side. Swing can be prevented, stability can be improved, and safety in use can be improved. In addition, since the reinforcement leg is connected to the center of the length of the leg,
Compared to the structure provided at both ends of the leg, the number of parts is reduced and the structure is simplified, it can be manufactured at low cost, and reinforcing legs can be attached to the pivot. There is an effect that can be easily changed. According to the ninth aspect of the present invention, since the reinforcing legs are erected vertically or obliquely,
The ladder can be stably and firmly supported. Claim 1
According to the invention of No. 0, a pair of legs are connected on the same surface by abutting each other, and the legs can be used upside down, and the reinforcing legs can be turned upside down and installed on the installation surface. The above convenience can be improved, and if the pair of legs is rotatably connected, the pair of legs can be compactly folded when the ladder is not used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment in which the present invention is applied to a stepladder which also serves as a ladder, and shows a use state thereof.

FIG. 2 is a front view of FIG. 1, showing the installation state of reinforcing legs.

FIG. 3 is an enlarged front view of an upper side surface of the present invention, showing a mounting state of a reinforcing leg.

FIG. 4 is a plan view of FIG. 3;

5 is a cross-sectional view taken along the line AA of FIG. 4, and is a cross-sectional view showing an assembly state of a support bracket, a connection bracket, and a reinforcing leg.

FIG. 6 is a perspective view showing a storage state when the ladder / stepladder is not used, in which a pair of legs are folded substantially in parallel.

FIG. 7 is a plan view of FIG. 6;

8 is a cross-sectional view taken along the line BB of FIG. 7 and shows a storage state of the reinforcing legs when not in use.

FIG. 9 is a front view of FIG. 7, showing a folded state of the leg and the reinforcing leg.

FIG. 10 is a perspective view showing a use state of the ladder / ladder, showing a situation where the ladder is used as a ladder.

FIG. 11 is an enlarged cross-sectional view showing a main part of a second embodiment of the present invention, showing an engagement state between a support fitting and a connecting fitting.

FIG. 12 is an enlarged cross-sectional view taken along the line CC of FIG. 11, showing a planar state of a bent piece of the support bracket.

FIG. 13 is an enlarged view showing a planar state of a bent piece of a connection fitting applied to the second embodiment.

FIG. 14 is a front view showing a main part of a third embodiment of the present invention, and shows a state in which a slip stopper is attached to a ground portion of a telescopic pillar of a reinforcing leg.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg 2 Strut 6 Axis (pin) 17 Support bracket 28 Reinforcement leg 32 Leg holder 33 Grounding surface

Claims (10)

[Claims] 1. A pair of legs having a pair of left and right columns and a step board provided thereon, the pair of legs being rotatably connected via a pivot, and supporting both sides of the legs. In a stepladder provided with a pair of left and right reinforcing legs, a pair of left and right reinforcing legs are rotatably connected to the pivot, and an end of the reinforcing leg can be installed on a ground surface between the legs. Stepladder to be. 2. The stepladder according to claim 1, wherein the reinforcing legs can be installed on an outer contact surface between the legs. 3. A stepladder according to claim 1, wherein an end of said reinforcing leg is adjustable in position in and out of a ground contact surface between said legs. 4. The stepladder according to claim 1, wherein a supporting bracket is rotatably connected to the pivot, and an upper end of the reinforcing leg is rotatably and swingably connected to the supporting bracket. 5. The stepladder according to claim 4, wherein the support bracket and the upper end of the reinforcing leg are detachably connected. 6. The stepladder according to claim 1, wherein a leg holder capable of holding a reinforcing leg is provided on a predetermined step of each leg, and the reinforcing leg is arranged between the folded legs. 7. The pair of legs are connected on the same plane, and the reinforcing leg protrudes downward from the connecting portion in a direction intersecting with the plane of the leg, so that an end of the reinforcing leg can be installed on a ground surface. The stepladder according to claim 1. 8. A ladder having a pair of left and right columns with a plurality of steps crossed thereon and a pair of left and right reinforcing legs supporting both sides of the pair of legs. A pair of left and right reinforcement legs are pivotally connected to the center via a pivot so as to be vertically rotatable, and the reinforcement legs are disposed below the leg plane in a direction crossing the leg body,
A ladder, wherein an end of the reinforcing leg can be installed on a ground contact surface below the leg. 9. The ladder according to claim 8, wherein the reinforcing legs are erected vertically or obliquely. 10. A pair of legs are connected to each other on the same surface by abutting each other to enable the legs to be used upside down.
9. The device according to claim 8, wherein the reinforcing legs are inverted and can be installed on the ground surface.
The ladder described.