JPH0429033Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a foldable ladder stepladder, which is characterized by an inverted Y-shape when used as a ladder, and an almost triangular pyramid-like shape when used as a stepladder.

In the current foldable ladder stepladder, the footrest, which is the top when used as a stepladder, becomes the central connecting part when used as a ladder. The size of the footrest, even a large one, is not much different from a small one, and even if the legs become longer, the size does not increase in proportion to the length. Therefore, the longer this type of ladder stepladder is, the smaller and weaker the connecting part in the center tends to be. Also, long items require less space to store, so it is rare for a typical household to keep them on hand.

Therefore, when climbing directly from the ground to the second floor roof,
Instead of this type of ladder stepladder, a retractable ladder should be used in regular homes.

In recent years, the number of houses with equal floor space on the first and second floors has increased, and it has become necessary to have a ladder that can be used to climb directly from the ground to the roof of the second floor. Additionally, houses with open atriums and high-mounted windows require work at heights.

By the way, you cannot use a retractable ladder to care for plants; you need a stepladder.

Therefore, it would be convenient if a single stepladder could handle all high-place work, including painting, cleaning, and maintenance of high-place parts of houses, for example.

A triangular stepladder used by gardeners is easy to use when caring for plants. It also has wider legs than a regular ladder stepladder, making it safe and secure even if you lean over it, but it cannot be folded and cannot be used as a ladder.

Some triangular metal stepladders have horizontal arms and legs that can be folded up to become a ladder, but even when folded, they are quite large and cannot fit into a home storage room. Furthermore, it has an unsightly shape with many uneven surfaces, so it should not be left outside the house.

By the way, this invention uses a gardener's triangular stepladder as an inverted Y-shaped ladder, and the particularly long legs are foldable into a single rod shape, and the biggest advantage is that it can be reduced to the smallest volume. It has characteristics.

This invention will be explained below with reference to drawings of one embodiment.

FIG. 1 is an oblique view centered on the connecting member 3 of this invention, and the upper shaft 1 has two legs 4, 4'.
One support shaft 5 is pivoted to the lower shaft 2 so as to be openable and closable, intersecting the upper and lower axes at right angles.

The two legs 4 and 4' have the same U-shaped cross-section, and when folded, they become a single square-shaped rod, creating a smart shape. A connecting member 3 in the shape of a bent plate, which is a combination of triangular shapes, is provided between the shafts 1 and 2, and the shaft 1 is connected to the upper bearing member 1'.
A shaft 2 is attached to the lower bearing member 2'.

A support leg 5 is rotatably attached to the shaft 2 via a bearing 6 protruding from the support leg 5.

In this embodiment, the cross-sectional shape of one support leg 5 is H.
The outer cross-sectional area of the mold is smaller than the inner cross-sectional area of the combined legs 4, 4'. Therefore, as shown in FIG. 2, the support leg 5 can be accommodated in the two square-shaped legs 4, 4'. Connecting member 3
The bearing members 1' and 2' may be integrally manufactured by bending sheet metal, or may be manufactured by casting or other means. This connecting member 3 twists 90 degrees from the bearing member 1' and extends downward, twisting the bearing member 2' and bringing it to one corner. In this way, by twisting the axes of the bearing members 1' and 2', the two legs 4,
4' and the opening/closing surfaces of one support leg 5 are also twisted by 90 degrees.

Figure 2 shows the shaft 1 and bearing member 1' seen from above.
The lower shaft 2 and the bearing member 2', and also the leg 4,
4' and support leg 5, showing the mounting and arrangement of the bearing member 2' in the folded state.

Referring to FIG. 1, it can be seen that the lower bearing member 2' is pushed to one side of the upper bearing member 1', and the bearing part 6 attached to the support leg 5 projects outwardly. , support leg 5 is connected to two legs 4,
It can be seen that it protrudes outward from between 4' and can be opened upward to about 180 degrees.

Similarly, it can be seen that one support leg 5 can be accommodated inside the two legs 4, 4', and the whole leg has a single, smart rod-like shape.

Next, using FIG. 3 and FIG. 1 together, this invention when used as a ladder will be explained.

The connecting member 3 has an almost triangular combination shape as a whole, but the base near the bearing member 1' has a shape that follows the inside of the legs 4, 4', and if a load is applied to the shaft 1, it will easily break. It is preferable to be close to the contact square.

Due to the contact friction between the connecting member 3 and the legs 4, 4', the rigidity of the connection is not burdened only on the shaft 1, and the rigidity when used as a ladder can be increased. A bearing part 6 protruding from the support leg 5 makes it possible to open the support leg 5 upwards by approximately 180 degrees from between the legs 4, 4'.

Further, the bearing portion 6 of the support leg 5 is connected to the two legs 4,
The connecting part between the upper and lower legs when used as a ladder, which is sandwiched in the middle of the ladder 4', is made to have high rigidity in both the left and right directions, as seen in FIG. With regard to ensuring rigidity when using a ladder, this invention can solve the problem of connecting parts, which is a particular problem with ladder stepladders, because the length of the connecting member 3 can be made freely.

Therefore, it is possible to put into practical use a long ladder stepladder that can be used to directly climb up to the second-story roof from the ground.

FIG. 4 is a perspective view of this device when it is used as a stepladder, and the arm and leg hanging rods 8 are removably attached.

The limb hanging rods may be attached, for example, by inserting the hooks at both ends into vertical holes provided in the legs 4, 4'.

As described above, it is preferable that the limb hanging rod 8 be attached in a manner that regulates the opening angle of the legs 4, 4'.

The leg opening angle of the support shaft 5 is regulated by the rope 9, and the support shaft 5 has a fourth
As shown in the figure, the stepladder has a substantially triangular pyramid shape.

It is necessary for both ladders and stepladders to securely fix the bearing part 6 by sandwiching it between the legs 4 and 4' at an appropriate distance, and special care should be taken when manufacturing products to which this invention is applied. It is a point. In addition, when transporting as a ladder, consideration must be given to the method of fixing the support legs 5 raised 180 degrees upward.

FIG. 5 shows that when the support leg 5 is raised to form a ladder, the limb hanging rod 7 pivoted to the support leg 5 is approximately 90
FIG.

The dotted line shows the folded state, and the solid line shows the state naturally opened by gravity.

In order to prevent the hands and feet from slipping and to ensure safe use, it is necessary to provide a protrusion at the tip of the hand and foot hanging rod 7, and to make the leg opening angle slightly less than 90 degrees. Also, in the case of a ladder, the top of the two legs 4 and 4',
Special consideration must be given to the method of attaching the limb hanging rods at the lowest part of the support legs 5. That is, whether this arm and foot hanging bar is designated by the symbol 8, which is attached to the two legs 4 and 4', or designated by the symbol 7, which is attached to the support leg 5,
There are two ways.

When attached to the two legs 4, 4', it cannot be attached at both ends like the other limb hanging rods 8, and a special attachment/detachment method is required. For example, there is a method of dropping it from above, but of course the shape will be different from others and suitable for that attachment/detachment method.

Also, when this limb hanging rod is pivoted to the support leg 5, special consideration is required in addition to extending the protruding length. For extension of the protruding portion, in the case of the hand-and-hand support rod 7 supported at one end, reinforcement is required to cope with the increase in load. For example, the two legs 4, 4' also require a mechanism such as providing hooks to support their extended portions.

There are no particular restrictions on the cross-sectional shape of the legs used to implement this invention, but it is preferable that the two legs 4 and 4' be U-shaped and the support leg 5 be H-shaped, so that the maximum weight can be achieved with the minimum weight. It is desirable to select a shape and material that can withstand deep grooves.

The biggest feature of this ladder stepladder is that when folded, the long legs, which would be difficult to place in a normal household, are turned into a single, smart rod, allowing it to be placed in the corner of a building or under the eaves without looking unsightly. . Short hand and foot hanging rods can be stored in a storeroom and are safe from a crime prevention perspective.

[Brief explanation of the drawing]

Figure 1 is an inclined view centered on the connecting member 3;
The figure shows a top view of bearing members 1' and 2', legs 4, 4' and 5,
FIG. 3 is a side view when used as a ladder, FIG. 4 is a perspective view when used as a stepladder, and FIG. 1 is a shaft rod, 1' is a bearing member, 2 is a shaft rod, 2' is a bearing member, 3 is a connecting member, 4 and 4' are two legs, 5
6 is a support leg, 6 is a bearing part, 7 is a bar for hanging arms and legs, 8 is a bar for hanging arms and legs, and 9 is a rope.

Claims (1)

[Scope of utility model registration request] The bearing member 2' of the shaft rod 2 is provided at the lower end of the connecting member 3 extending downward from the bearing member 1' of the shaft rod 1, and the axes of the shaft rod 1 and shaft rod 2 intersect at right angles when viewed from above. A bearing member 1' is provided at the upper end of the connecting member 3, a bearing member 2' is provided at the lower end, and the shaft rod 1
has two legs 4, 4' with openings in the length direction.
are pivoted so that the legs can be opened with their openings facing each other, one support leg 5 is rotatably pivoted on the shaft rod 2, and the cross-sectional area of the two legs 4, 4' is the same as the support leg 5. The support leg 5 can be accommodated larger than the cross-sectional area of 1.
A limb hanging rod 7 that can be opened up to approximately 90 degrees can be pivoted to the book support leg 5, and several limb hanging rods 8 can be attached to the two legs 4 and 4'.
An inverted Y-shaped ladder stepladder that can be detachably attached.