JPS6022117Y2 - ladder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ladder, and more particularly, to an improvement of a ladder that is attached and fixed to a wall formed by stacking in multiple stages.

Conventionally, in this type of ladder, as shown in Figs. 7 and 8, there are left and right side rods a', a'' and left and right side rods a/.

The structure consists of linear footrests b' that are horizontally fixed at regular intervals along the longitudinal direction of the footrest a'.

However, in the above-mentioned ladder A' structure, in order to install the footrest so that the foot can be hung on the footrest rod b', the right and left side rods a' and a'', which are used to horizontally fix the footrest rod b', must be attached to the mounting wall B'. Since it is necessary to install it with a gap between the two sides, as shown in Figure 8, there are mounting legs protruding toward the mounting wall surface B' near the upper and lower ends of the left and right rods a' and a'. The base end of the mounting leg is fixed to the wall β'.

However, when walls are stacked in multiple tiers, there is a risk that the cylindrical bodies constituting the walls may become misaligned due to long-term natural phenomena such as earthquakes.

Therefore, when a ladder is fixed to a wall, its mounting point is
That is, there is a risk that the base end of the mounting leg may be damaged and come off the wall surface, which is also dangerous.

Therefore, the present invention solves the above-mentioned conventional problems, and strengthens the wall surface formed by stacking in multiple stages by attaching and fixing the left and right side rods that make up the ladder to the wall surface, etc., through mounting pieces. The purpose of the present invention is to provide a ladder that reliably prevents the displacement of wall surfaces caused by long-term natural phenomena and that does not impede stepping onto the footrests.

In the ladder of the present invention, the footrests are formed into a planar shape, and the approximately mid-way portions of both the left and right rods are bent downward to form horizontal footrests, and the base ends of the left and right rods are bent on the left and right sides. It is characterized in that it is welded and fixed to the leg rods on both sides at right angles, and furthermore, mounting pieces for attaching the left and right leg rods to a wall surface etc. are directly welded and fixed to appropriate locations on the left and right leg rods.

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 to 4 show the first embodiment, in which A is a ladder, , at are leg levers on both left and right sides, and b are leg levers on both left and right sides. The leg levers protruding forward are C, which are the leg levers on both the left and right sides; at
This is a mounting piece that is attached and fixed to the wall surface B formed by stacking the pipes in multiple stages, for example, the wall surface of an entrance/exit hole such as a manhole through which people go in and out of a sewer pipe etc. as shown in the figure.

The foothold rod has a chevron-shaped planar shape, and both left and right rod portions are bent downward at approximately the midpoint of the foot portions to form a horizontal foothold portion.

For more details, see both left and right rod portions b2. A vertical rod portion b3' is formed by bending the approximately midway portion of b2' downward, and both vertical rod portions b3? A footrest is formed by integrally connecting horizontal rods across the lower end of b3'.

In both the left and right rod parts, b2' is the mounting leg part.

The foot rod formed as described above is attached to both of its legs, b
The proximal ends of the two leg parts b'x, bz' are attached to the left and right leg levers 3. Weld and fix it to a' (Figure 4).

Then, as described above, attach the footrests to both the left and right leg levers a.
, a' are sequentially welded and fixed at regular intervals along the longitudinal direction (FIGS. 1 and 2).

In addition, mounting pieces C for attaching the left and right leg rods, a/ to a wall surface B formed by stacking them in multiple stages are welded and fixed to the upper and lower ends of the left and right leg rods, a/, respectively. (Figures 2 and 4).

Further, the entire ladder A is provided with an outer skin 2 lined with a rubber material or a synthetic resin material, and its frictional resistance is used to prevent slipping, and at the same time, the overall connection strength of the ladder A is measured.

Then, attach ladder A to mounting piece c, C... to anchor bolt 3.
By fixing it to a wall surface B, etc., the left and right leg rods a, a' are attached and fixed in close contact with the inner wall surface 1b of the cylindrical body 1 constituting the multi-stage wall surface B. (Figures 2 and 3).

Therefore, the ladder A is attached to the wall surface B etc. with a solid structure that does not cause any wobbling, and moreover, the left and right leg rods, a/, are in close contact with the inner wall surface 1b of each cylinder 1 that constitutes the multi-stage wall surface B. Since the wall surfaces 1b are fixed in place, it is possible to reliably prevent the wall surfaces 1b from shifting due to natural phenomena.

FIG. 5 shows another embodiment, in which both legs of the above-mentioned footrest rod b2. b2' is bent in an inclined direction in the direction opposite to the plane (outward), and by forming it into such a shape, it can be installed on a curved wall surface B such as a manhole as in the first embodiment of the present invention. When fixed, the fixation becomes even more solid.

In the first embodiment of the present invention, the ladder A is constructed by welding and fixing the footrests to the right and left leg rods a, a' of a predetermined length, but the ladder unit A1 of the upper and lower or multiple values is ．． A
2... A pair of mutually corresponding bilateral leg rods a1. a
2, a recess a on one axis of the connecting surface a3 of al, A2,
A convex portion a5 is formed on the other side of the upper ladder unit A.
1 and the lower ladder unit A2 with its both side leg levers a1. a2
, a□, A2 can also be fitted with the concave portion a4 and the convex portion to form a ladder A of a predetermined length (FIGS. 6 and 7).

At this time, place the mounting piece C to be attached to the wall surface B etc. on the top, and the Senryo ladder unit A1. A2 left and right leg rods a□, a2, a□,
They are welded and fixed near the connecting ends of A2 (Fig. 6).

By configuring the ladder A in this way, transportation and handling are convenient.

Furthermore, in the embodiment of the present invention, the ladder A is attached and fixed to the wall surface B of a manhole or the like, but it can also be attached and fixed to the wall of a multi-tiered structure such as a building.

In the ladder of the present invention, a horizontal foothold part is formed by bending downward the approximately mid-way parts of both the left and right part of the foothold part, which has a planar shape as shown in the figure. The base ends are welded and fixed to the left and right leg bars so as to be perpendicular to the left and right leg bars, and the mounting pieces are welded and fixed directly to the left and right leg bars, so that they can be fixed to walls, etc. By attaching and fixing the mounting pieces to the wall surface, the left and right leg rods are firmly attached to the wall surface, so the walls that make up the multi-tiered wall surface are reinforced by pressure contact, and the misalignment between the wall surfaces that occurs due to natural phenomena can be avoided. Hold firmly.

Therefore, it is possible to reliably prevent damage to the attachment portion between the ladder and the wall due to misalignment.

In addition, the horizontal footrests are formed by bending the right and left ends of the planar footrest rods downwards to form horizontal footrests, making it easy to use so that even if you accidentally skid while going up or down, you will not lose your foot. Safety can be improved.

Therefore, the ladder of the present invention not only reinforces the multi-tiered wall surface but also provides a solid structure for mounting, and is also safe in use.

Therefore, the intended purpose can be achieved.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment of the ladder of the present invention, Figure 1 is a front view showing the state of use, and Figure 2 is the same as shown in Figure 1.
Fig. 3 is a cross-sectional enlarged plan view taken along the line ■-■ in Fig. 1, Fig. 4 is an enlarged perspective view of a part of Fig. 1, and Fig. 5 is a cross-sectional side view taken along the line. 6 is a perspective view showing the ladder as two ladder units, upper and lower; FIGS. 7 and 8 show the conventional example; and FIG. 7 shows the state in use. The front view and FIG. 8 are longitudinal sectional side views of FIG. 7. In the diagram, A...Ladder, , a/...Legs on both left and right sides, B...Step lever, To...Step rest, C... ...Mounting piece, B...Wall surface.

Claims (1)

[Scope of utility model registration request] It consists of left and right leg rods, leg rods that protrude forward at regular intervals along the longitudinal direction, and mounting pieces for attaching and fixing the left and right leg rods to a wall surface, etc., and the leg rods have a planar shape. It has a chevron shape, and is formed by bending the substantially midway portions of both the left and right rod portions downward to form a horizontal leg rest, and fixing the proximal ends of the left and right rod portions to the left and right leg rods at right angles. ladder.