JPS606560Y2 - Opening stop device for stepladders that double as ladders - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an opening stop device for a stepladder that also serves as a ladder.

Conventionally, as a device for preventing the opening of the side bars of a stepladder that can also be used as a ladder, a stop plate is rotatably attached to one of the mutually opposing side bars of the stepladder, and a stopper is provided protruding from the other side bar. By rotating the stopper plate, the locking hole formed at the end of the stopper plate is removably engaged with the stopper.

However, with such a structure, there is a risk that the opening stopper plate may inadvertently rotate due to vibration or the like and be disengaged from the stopper, resulting in a lack of safety.

Therefore, in view of the above problems, the present invention aims to improve safety by preventing accidental separation of the locking hole part of the stopper plate and the stopper.The feature of this invention is that the hinge One end of a stopper plate is rotatably attached to one of the side rods facing each other, which can be opened and closed by rotating around the pivot of the stopper plate, and the stopper plate is provided at the other end of the stopper plate. In a stepladder that can be used as a ladder, the locking hole can be freely connected to and detached from the locking fitting protruding from the other side beam by rotating the locking hole around the pivot. A box-shaped cover that removably covers the outward protrusion of the metal fitting to prevent it from being pulled out is pivotably pivoted to the outer surface of the opening stop plate, and the cover is spring-loaded in the covering direction. The point is that the spring that powers the engine is attached.

Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIG. 1 and FIG. 1 pair of side rods 2. 2. 3. 3, and a hinge part 4 that rotatably connects the upper ends of the side bars 2 and 3 facing each other.

The hinge portion 4 is comprised of a pair of hinge portions 5 and 6 fixed to the side bars 2 and 3, respectively, and a pivot 7 that pivotally connects the hinge portions 5 and 6.

By rotating the side bars 2 and 3 about the pivot 7, they can be opened and closed.

Reference numeral 8 denotes an opening stop plate, which consists of a first flat rod 9 and a second flat rod 1°, each end of which is rotatably connected by a pivot 11. ing.

Reference numeral 12 denotes a stop pin that restricts relative rotation between the first flat rod 9 and the second rod 10.

The other end of the first flat rod 9 is attached to a pivot 13 on the outer side of the side rod 3.
It is rotatably pivoted.

A stopper 14 is provided on the outer surface of the other side rod 2 in a shape that projects outwardly, and a disc-shaped retaining portion 15 is formed on the protruding end of the stopper 14 and extends outward in the radial direction. is provided.

As shown in FIGS. 1 and 4, the end of the stopper plate 8, that is, the end of the second flat rod 10, has a large diameter insertion/removal hole into which the stopper 15 can be inserted and removed. 16 and a small-diameter locking hole 17 through which the locking part 15 is locked in order to prevent it from being pulled out. While inserting the retaining part 15 in a removable manner,
By rotating the second flat rod 10 in the direction of the arrow P, the locking hole 18 and the stopper 14 are moved relative to each other, and the stopper 14 is fitted into the locking hole 17 and the periphery of the locking hole 17 and the stopper 14 are moved relative to each other. The retaining portion 15 is locked in a manner to prevent withdrawal.

19 is a box-shaped cover, with the opening side inward and the second flat rod 1
It is pivotally mounted by inserting a shaft 21 into a support piece 20 provided on the outer surface of the shaft 20, and as shown in FIGS. section 22, and can be freely swung by pushing the operating section 22.

In addition, the other end of the cover 19 can freely approach and separate from the outer surface of the second rod 10 in order to surround and cover the outer circumference of the locking hole 17 of the locking hole 18. The end side periphery is the second flat rod 10
A spring 23 that elastically biases the cover 19 to come into contact with the outer surface.
is attached to the shaft 21.

When the stopper 14 and the locking hole 17 are engaged, the stopper 14 is configured to cover the retaining portion 15 projecting outward from the stopper 14 .

Further, when the operating portion 22 is pushed in against the biasing force of the spring 23, the other end side peripheral edge of the cover 19 is configured to separate from the outer surface of the second flat rod 10.

The embodiment of the present invention is constructed as described above, and when each side rod 2, 3 is to be prevented from opening, the retaining portion 15 of the stopper 14 is projected from the insertion/removal hole 16 of the second flat rod 10. After that, if the second flat rod 10 is rotated in the direction of arrow P, the locking hole 17 is closed.
A secured state in which the and the stopper 14 are locked is obtained.

Incidentally, during this operation, the operating portion 22 of the cover 19 is pushed in to separate the periphery of the other end of the cover 19 from the outer surface of the second flat rod 10.

After the locking state is obtained, when the pushing force of the operating part 22 is released, the other end side periphery of the covering body 19 covers the outer periphery of the retaining part 15 due to the resilient urging force of the spring 23, and the second flat rod 10 A locked state in which it contacts the outer surface is obtained.

In this state, even if vibration etc. occur in the opening stopper plate 8,
Since the retaining part 15 of the stopper 14 contacts the inner surface of the periphery of the other end of the cover 19 in a manner that allows it to move toward and away from the cover 19, relative movement is prevented, so there is a risk that the stopper 14 may accidentally come off from the locking hole 17. Therefore, there is no possibility that the opening stopper plate 8 will be inadvertently detached from the stopper 14, and safety can be improved.

In addition, if an inadvertent pushing force acts on the operation part 22, the cover 1
Even if the other end side periphery of the second flat rod 9 separates from the outer surface of the second flat rod 10, the locking hole 17 and the retaining portion 15 are locked, so the stopper plate 8 will not separate from the stopper 14. If there is no risk of this happening and the inadvertent pushing force is released,
Since the original locking state is restored by the firing force of the spring 23, safety can also be improved from this point of view.

That is, the stopper 14 opens between the locking hole 17 of the stopper plate 8 and the cover 1.
This is a so-called double lock mechanism in which the lock is locked on both sides of the lock 9, and accidental unlocking can be prevented, resulting in great safety.

In addition, when the opening stopper plate 8 is to be removed from the stopper 14, push the operation part 22 to move the other end side periphery of the cover 19 away from the outer surface of the second column 10, and move in the direction opposite to the arrow P. By rotating the second flat rod 10, the engagement between the locking hole 17 and the stopper 14 can be easily released.

Moreover, it has a simple structure in which a cover 19 is provided to cover the outside of the stopper 14, and can be easily manufactured.

In the above embodiments, the locking hole portion 18 is shown as having a dart shape consisting of the large diameter insertion/removal hole 16 and the small diameter locking hole 17, but for example, the lower end of the large diameter insertion/removal hole 16 The locking hole 18 may be a cut-shaped locking hole 18 whose side is open downward, and is not limited to the shape of the above embodiment. A box cover that releasably covers and retains the opening plate is swingably pivoted to the outer surface of the opening stop plate, and is equipped with a spring that elastically biases the cover in the covering direction. This is a so-called double lock mechanism in which the stopper is locked at both the locking hole of the stopper plate and the cover, which prevents accidental release of the lock. Separation can be prevented and safety can be improved.

It also has the advantage of having a simple configuration and being easily manufactured.

[Brief explanation of drawings]

Figure 1 is a side view of essential parts showing an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a cross-sectional view taken along the line ■-■ in Figure 1. The figure is a sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a sectional view taken along the line ■-V in FIG. 4. 1...Stepladder that doubles as a ladder, 2...Side beam, 3
...Curved side rod, 4...Hinge part, 7...Pivot, butt/curved opening stop plate, 14...Stop fitting, 18
...Curved locking hole portion, 19... Cover, 23...
...Spring.

Claims (1)

[Scope of utility model registration request] One end of an opening stopper plate 8 is rotatably pivoted to one of the side rods 2 and 3 facing each other, which can be opened and closed by rotating the hinge portion 4 about the pivot 7. A ladder-cum-stepladder 1 in which a locking hole 18 provided at the other end of a stop plate 8 can be freely engaged and detached from a stopper 14 protruding from the other side beam 2 by rotating around a pivot 13. In the locking hole portion 18
A box-shaped cover 19 that removably covers the outwardly protruding portion of the stopper 14 that is engaged with the stopper 14 to prevent it from being pulled out is pivotally attached to the outer surface of the stopper plate 8 so as to be able to swing freely. An opening stop device for a stepladder that can be used as a ladder, characterized in that a spring 23 is attached to resiliently bias the body 19 in the covering direction.