JPH0949383A - Ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an overturn accident of a ladder by forming the ladder into a structure causing no inconvenience for transportation and storage. SOLUTION: Auxiliary legs 3R, 3L grounded in the stretched state outward to the right and left directions from the lower side ends are provided on the right and left legs 2R, 2L of a ladder. The auxiliary legs 3R, 3L are provided foldably inward toward the center of the ladder via hinges 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder in which left and right legs having a plurality of steppers vertically provided at predetermined intervals are used by directly standing on the ground or floor.

[0002]

2. Description of the Related Art There are two types of ladders, and four types of ladders, such as a stepladder, in which a plate serving as a scaffold is mounted on a forked ladder. A two-legged ladder that stands on the ground or floor with only a pair of left and right legs is used by leaning it up in a high place such as a building or tree, but the load of the person climbing the ladder is close to the building or tree. If it is applied to the upper end of the leg, the lower end of the leg standing away from the building or trees may slip on the ground or floor surface and fall in the front-back direction. If hung up, there is a risk of tipping over in the horizontal direction. On the other hand, a four-legged bifurcated ladder such as a stepladder has two pairs of left and right legs, so there is no risk of tipping forward or backward due to slip, but like the two-legged ladder, There is a risk of falling.

For this reason, at the lower end of each leg, a road plate extending from the lower end in the longitudinal direction of the ladder is attached in a T-shape, and at the same time, a slip stopper such as a rubber plate is provided on the lower surface of the road plate to cause front and rear slippage. Measures have been taken to prevent a tumbling accident in the directional direction, or to prevent a tumbling accident in the left-right direction by attaching a road plate extending in the left-right direction of the ladder in a T shape.

[0004]

However, the ladder in which the road plate extending in the front-rear direction or the left-right direction from the lower end of the leg is attached to the lower end of the leg in a T-shape is inconvenient to carry and store. That is, when carrying or storing the ladder, there is a risk that the road plate attached to the lower ends of the left and right legs in a T shape may hit an obstacle or get injured by catching a person's body or clothes. .

In order to avoid such a danger, the length of the road plate must be shortened, so that the ground contact area of the road plate is inevitably small and the stability is poor. Therefore, it is a technical object of the present invention to reliably eliminate the risk of tipping over in the left-right direction that is common to two-legged ladders and four-legged ladders, and at the same time eliminate the inconvenience of carrying and storing.

[0006]

In order to solve the above-mentioned problems, the present invention relates to the left and right legs provided with a plurality of steppers at predetermined intervals in the vertical direction, and the left and right legs of the ladder from the lower end thereof respectively. It is characterized in that an auxiliary leg, which is grounded in a state of protruding outward in the direction, is attached by a hinge so as to be foldable inward toward the center of the ladder.

According to the present invention, from the lower side ends of the left and right legs, the auxiliary legs attached to the respective legs project outward in the left-right direction of the ladder and contact the ground, so that the ladder is applied by one load. Accidents where the car falls to the left or right will be prevented. Also, since the auxiliary legs can be folded inward toward the center of the ladder, there is no risk of hitting obstacles or catching people's body or clothes when carrying or storing the ladder, and at the same time the auxiliary legs are grounded. The length can be increased to significantly increase the stability of the ladder.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a front view showing an example of a ladder according to the present invention, FIG. 2 is a rear view thereof, FIG. 3 is a front view showing another example, and FIG. 4 is a perspective view thereof.

The ladder shown in FIGS. 1 and 2 has a pair of left and right legs 2 in which a plurality of steppers 1 are vertically arranged at predetermined intervals.
Auxiliary legs 3R and 3 that ground to the R and 2L, respectively, while protruding outward from the lower end of the ladder toward the left and right direction of the ladder.
L is attached by a hinge 4 so that it can be folded inward toward the center of the ladder. Foot 1 and legs 2R, 2L
Are made of metal square pipes made of light alloy. The left and right legs 2R and 2L are arranged in parallel with each other.

The auxiliary legs 3R and 3L are respectively connected to the legs 2R and 2L.
The legs 2R and 2L so that they are closely attached along the lower end of L
On the other hand, the metal square pipe portion 6 fixed by the hinge 4 and the latch metal 5 and the side end of the square pipe portion 6 are fixed by rivets, bolts / nuts, welding or any other joining means. The plate body 7 made of metal and the plate body 7
Is formed in a triangle (right triangle) having an apex angle equal to the angle (90 °) generated between the lower end surface 8 of each leg 2R, 2L and the ground contact surface 9. The square pipe section 6
Is provided with a lock pin 10 for locking the latch metal fitting 5 provided on each leg 2R, 2L.

However, when the ladder is used, as shown by the solid lines in FIGS. 1 and 2, the auxiliary legs 3R and 3L are grounded in a state of projecting outward in the left-right direction of the ladder. The latch fittings 5 provided on the legs 2R and 2L are hooked on the lock pins 10 provided on the square pipe portions 6 of the auxiliary legs 3R and 3L. As a result, the stability of the ladder with respect to one-sided loading is increased, and a fall accident in the left-right direction is prevented in advance.

When carrying or storing the ladder, the latch metal fitting 5 which is hung on the lock pin 10 is removed, and the auxiliary legs 3R and 3L are folded inward toward the center of the ladder as shown by the chain line. . As a result, the auxiliary legs 3R, 3L do not get in the way when carrying or storing the ladder, and there is no risk of injury or damage caused by catching clothes or body on the auxiliary legs 3R, 3L, and the storage space is large. Nothing. Further, since the length of each of the auxiliary legs 3R and 3L can be increased to the limit of being able to be folded inside the ladder, the stability of the ladder is significantly improved.

Next, FIGS. 3 and 4 show an example of a four-legged ladder (ladder) in which a board 11 serving as a scaffold is mounted on a bifurcated ladder. Leg 2
Auxiliary legs 3R and 3L are attached only to R and 2L. The ladder of this example is formed such that the interval between the legs 2R and 2L is gradually narrowed from the lower end side toward the upper end side, and the auxiliary legs 3R, 3L are
The ladder structure differs from the ladder structure shown in FIGS. 1 and 2 in that it is formed by a triangular frame body 12 having an apex angle equal to the angle formed between the lower side end surface 8 of 2L and the ground contact surface 9. However, since other points are basically common, detailed description of the common parts will be omitted.

The frame 12 forming each of the auxiliary legs 3R and 3L is made by welding a square metal pipe material having a thickness substantially the same as that of the legs 2R and 2L. Also, each auxiliary leg 3
R and 3L have legs 2R and 2L attached thereto, respectively, which are inclined toward the inside of the ladder from the lower end side toward the upper end side thereof, so when the legs are folded inside the ladder,
The tips of the auxiliary legs 3R and 3L have the legs 2 as shown by the chain lines.
Although it projects slightly below the lower ends of R and 2L, the projection does not interfere with the carrying of the ladder, and when the ladder is stowed, the ladder is hung or laid sideways. When the auxiliary legs 3R and 3L are stored in the state, there is no problem even if the tip ends of the auxiliary legs 3R and 3L project below the lower ends of the legs 2R and 2L.

Further, as shown in FIG. 3, the auxiliary legs 3R and 3L are
By providing the leg end fitting 13 for adjusting the length of the leg with a screw, even when the ground contact surface 9 is inclined in the left-right direction,
The inclination can be allowed by the leg end fittings 13 to keep the posture of the entire ladder straight, and the grounding surface 9 can be surely grounded even if there are some irregularities. Also, FIG.
And auxiliary legs 3R, 3L of a two-legged ladder as shown in FIG.
If the leg end fittings 13 as shown in FIG. 3 are provided on each of the auxiliary legs 3R,
It is also possible to prevent the ladder from tipping in the front-rear direction by projecting 3L outward from the center of the ladder by an angle of 90 °, and then extending the leg end fitting 13 to the contact surface 9 to contact the ground. . The leg end fitting 13 has a structure in which a disc-shaped foot 15 is attached to the lower end of a screw shaft 14 that is screwed into each of the auxiliary legs 3R and 3L, and if necessary, on the back surface of the foot 15. Apply a rubber plate to prevent slipping.

[0016]

According to the present invention, it is possible to surely eliminate the risk of the ladder falling down in the left-right direction, and at the same time, there is no inconvenience when carrying or storing the ladder. is there.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a ladder according to the present invention.

FIG. 2 is a rear view of the ladder shown in FIG.

FIG. 3 is a front view showing another example of the ladder according to the present invention.

FIG. 4 is a perspective view of the ladder shown in FIG.

[Explanation of symbols]

 1 ... Foot 2R ... Leg 2L ... Leg 3R ... Auxiliary leg 3L ... Auxiliary leg 4 ... Hinge 7 ... Plate 8 ...... Lower end surface of leg 9 ...... Grounding surface 12 ...... Frame 13 ...... Leg end fitting

Claims (3)

[Claims] 1. A state in which a plurality of steppers (1) are provided on left and right legs (2R, 2L) provided at predetermined intervals in the up-down direction and project outward from the lower side ends thereof in the left-right direction of the ladder. A ladder in which auxiliary legs (3R, 3L) grounded at are attached by a hinge (4) so as to be foldable inward toward the center of the ladder. 2. The auxiliary leg (3R, 3L) has an apex angle equal to the angle formed between the lower end surface (8) of the leg (2R, 2L) and the ground contact surface (9). The ladder according to claim 1, which is formed of a triangular plate (7) or a frame (12). 3. The ladder according to claim 1, wherein the auxiliary legs (3R, 3L) are provided with leg end fittings (13) for adjusting the length of the legs with screws.