JPH0547279Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications This invention relates to a stepladder whose legs can be opened and closed.

Conventional technology and problems with the invention A stepladder usually has a top plate on the top of a pair of legs, and the tops of the legs are rotatably connected to each other so that the legs can be opened and closed. There is.
A stepladder with legs that can be opened and closed requires a stopper to prevent the legs from opening too far.As the stopper, pins are provided at both ends of one leg, and pins are attached to both ends of the other leg. It is known that a matching hook is attached.

However, in the case of the stepladder described above, when opening and closing the legs, it is necessary to attach and detach the two hooks at both ends, which occupies both hands and is cumbersome to operate.

The purpose of this invention is to solve the above problems and provide a stepladder whose legs can be opened and closed very easily.

Means for Solving the Problems The stepladder according to this invention has a pair of legs that are rotatably connected at the upper part of each leg so that they can be opened and closed. The rotating members are each fixedly provided so as to be able to rotate, and a rod-shaped opening stopper member is passed through an elongated hole formed in the overlapped portion of the rotating members at both ends of the leg. The long holes are connected to each rotating member so that when the lock member moves downward, the overlap between the rotating members becomes smaller and the legs open, and when the stopper member moves upward, the overlap between the rotating members becomes larger and the legs close. It is formed in

Function: When the leg opens, the overlap between the rotating members at both ends of the leg becomes smaller, and the opening stopper member moves downward within the elongated hole of the rotating member. When the legs are fully opened, the stopper member moves to the lower end of the elongated hole, and the rotating members can no longer rotate relative to each other. For this reason, the legs will no longer open and are stopped from opening.

Therefore, when using a stepladder, all you have to do is hold it with one hand, place it on the floor, etc., and use that hand to hold one leg and open the stepladder.

If the floor or other surface is smooth and there is no anti-slip material at the bottom of the legs, you can simply place the stepladder on the floor with one hand and allow the legs to open under their own weight.

Of course, it is also possible to hold both legs with both hands and open them.

When the opening stopper member is lifted, it moves upward in the elongated hole of the rotary member, the overlapping of the rotary members increases, and the legs close.

Therefore, the legs can be closed by simply holding the middle of the upper part of one leg with one hand and lifting the middle part of the stopper member upward with the fingertips of that hand.

At this time, you can use your remaining hand to assist in closing your legs.

It is also possible to hold the middle part of the upper part of both legs with both hands and lift the opening stop member with one or both hands.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings.

Figures 1 to 3 show the overall structure of the stepladder.
7 to 7 show details of the opening stop means.

As shown in FIGS. 1 to 3, the stepladder is composed of a pair of legs 1 and 2.

Each leg 1, 2 has pillars 3, 4 at both ends, and pillars 3, 4.
4, top plates 5 and 6 that connect the upper ends of the columns 3 and 4, step bars 7 and 8 that connect the lower portions of the columns 3 and 4, and column end fittings 9 and 10 that are attached to the lower ends of the columns 3 and 4.
and rotating members 11 and 12 fixed to the upper ends of the pillars 3 and 4 at both ends, and both legs 1 and 2.
The rotating members 11 and 12 of the corresponding columns 3 and 4 are rotatably connected to each other.

The pillars 3, 4, the top plates 5, 6, and the treads 7, 8 are
For example, it is made of extruded aluminum alloy. The pillars 3 and 4 are formed in the shape of a groove, and both upper and lower ends thereof are cut off diagonally so as to be parallel to each other. The top plates 5, 6 and the step bars 7, 8 are formed in the shape of hollow pipes with a trapezoidal cross section, and both ends thereof are fitted between the webs 3a, 4a of the support columns 3, 4, and fixed by rivets 13. The upper walls 5a, 6a of the top plates 5, 6 extend beyond the upper ends of the webs 3a, 4a on one side of the columns 3, 4 toward the legs 1, 2 on the other side.

The strut ends 9 and 10 are made of polyvinyl chloride, for example, and are fitted onto the lower ends of the struts 3 and 4 and fixed with rivets 14.

The rotating members 11 and 12 are formed of, for example, a steel plate into a substantially rectangular plate shape, and one end portion thereof is placed against the outer surface of the flanges 3b and 4b of the support columns 3 and 4, and is fixed by a rivet 15. The upper edges 11a, 12a of the rotating members 11, 12 are the top plate 5,
The rotary members 11, 12 extend longer than the upper walls 5a, 6a in the same direction as the extensions of the upper walls 5a, 6a.
Then, the parts of the corresponding pair of rotating members 11 and 12 that protrude from the upper walls 5a and 6a of the top plates 5 and 6 are overlapped with each other, and the upper part of this overlapped part is inserted through the spacer 16 and the washer 17. They are rotatably connected by a rivet-like hinge pin 18. Elongated holes 19 and 2 are provided below the hinge pin 18 at the overlapping portion of the pair of rotating members 11 and 12.
0 is formed. A pair of rotating members 11, 12
The long holes 19 and 20 always partially overlap,
A rod-shaped opening stopper member 21 is passed through the overlapping portion of the rotating members 11 and 12 at both ends.
Both ends of the opening stopper member 21 protrude outward from the rotating members 11 and 12 on the outside of both ends, and threads 21a are formed in these parts. Then, the washer 22 and the nut 23 are fitted into the male threads 21a at both ends of the opening preventing member 21, and the opening preventing member 21 is fitted with a washer 22 and a nut 23.
No. 1 is prevented from falling off.

The elongated holes 19 and 20 extend vertically, and when the stopper member 21 moves downward, the rotating members 11 and 1
2 becomes smaller, the legs 1 and 2 open, and when the opening stopper 21 moves upward, the rotating member 1
The legs 1 and 2 are formed so that the overlap between them becomes larger and the legs 1 and 2 are closed. That is, when the legs 1 and 2 are open, the lower ends 19a and 20a of the elongated holes 19 and 20 of the pair of rotating members 11 and 12 match,
An opening stopper member 21 passes through this portion. At this time, the upper parts of the elongated holes 19 and 20 are connected to the hinge pin 18.
Therefore, the rotating members 11 and 12 extend diagonally toward the columns 3 and 4 to which they are fixed. When the stopper member 21 is lifted upward from such a state, it moves upward within the elongated holes 19 and 20, and the matching portion of the elongated holes 19 and 20 moves upward. Therefore, the overlapping of the rotating members 11 and 12 becomes large, and the legs 1 and 2 are closed. When the legs 1 and 2 are completely closed, the opening stopper 21 is inserted into the elongated hole 1.
It has moved to a part near the top of 9 and 20. Furthermore, when the legs 1 and 2 open from this state, the overlap between the rotating members 11 and 12 becomes smaller, so the opening stopper 21 moves downward in the elongated holes 19 and 20, and the legs 1 and 2 open. When fully opened, the stopper member 21 moves to the lower ends 19a, 20a of the elongated holes 19, 20, and the rotating members 11, 12 can no longer rotate relative to each other. Therefore, the legs 1 and 2 will not open any further, and will be stopped from opening. In addition, when the legs 1 and 2 are completely opened in this way, the upper walls 5a and 6a of both the top plates 5 and 6 and the support end fittings 9 and 1
The bottom surface of 0 becomes horizontal.

As mentioned above, when the legs 1 and 2 are opened, the rotating member 1
The elongated holes 19 and 20 of 1 and 12 and the opening stopper member 21 naturally prevent the door from opening, so when using the stepladder mentioned above, hold it with one hand, place it on the floor, etc., and use that hand to close the leg. All you have to do is open the lever holding either 1 or 2.

If the floor or other surface is smooth and the lower ends of legs 1 and 2 are not anti-slip, you can simply place the stepladder on the floor with one hand and allow legs 1 and 2 to open under their own weight. can.

Of course, it is also possible to hold both legs 1 and 2 with both hands to open them.

In addition, as mentioned above, when the opening stopper member 21 is lifted, the legs 1 and 2 are closed, so the legs 1 and 2 can be closed with one hand.
Simply hold the middle part of the upper part of one of the members and lift the middle part of the stopper member 21 upward with the fingertips of your hand.
Legs 1 and 2 can be closed.

At this time, the remaining hand can assist in closing the legs 1 and 2.

It is also possible to hold the middle of the upper parts of both legs 1 and 2 with both hands and lift the opening stopper member 21 with one or both hands.

In this way, the stepladder mentioned above allows you to easily open and close legs 1 and 2 with one hand, so while holding something else in one hand, open and close the legs with the other hand and move the stepladder to another location. It becomes possible to do things like this.

Effects of the invention According to the stepladder of this invention, as described above, the legs can be easily opened and closed with one hand, for example.

[Brief explanation of the drawing]

Figure 1 is a front view of a stepladder with its legs open, showing an embodiment of this invention, Figure 2 is a side view of the same, Figure 3 is a front view of the stepladder with its legs closed, and Figure 4 is a front view of the stepladder with its legs opened. Figure 1 is an enlarged cross-sectional view taken along the line shown in Figure 1 with the intermediate part omitted; Figure 5 is a cross-sectional view taken along the line shown in Figure 4; Figure 6 is a drawing equivalent to Figure 5 showing the legs in a closed state; The figure is an exploded perspective view showing one end of the opening stopper member and the rotating member. 1, 2... Leg, 11, 12... Rotating member, 1
9, 20...long hole, 21...opening stopper member.

Claims (1)

[Scope of utility model registration request] A pair of legs are rotatably connected at the top of each so that they can be opened and closed, and at both ends of the top of each leg,
Rotating members are provided in a fixed manner so that they partially overlap and can rotate relative to each other by opening and closing the legs,
A rod-shaped stopper member is passed through an elongated hole formed in the overlapping part of the rotating members at both ends of the leg, and when the stopper member moves downward, the overlap between the rotating members becomes smaller and the legs are closed. The stepladder has the elongated holes formed in each rotating member so that when the opening stopper member moves upward, the rotating members overlap each other and close the legs.