JP3048282U - Ladder - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent slippage even when the inside of sewage equipment such as a manhole is humid, and to easily confirm the position of steps and scales even with weak light such as a flashlight. To provide a ladder excellent in corrosion resistance and strength resistance. SOLUTION: Step 2 has a rectangular cross section, and
By forming the uneven portion 2a on the surface, it is possible to safely ascend and descend without slipping even in the case of high humidity. Further, by forming the reflecting portions 2b on the entire peripheral surfaces at both ends of the step 2, the position of the step 2 can be obtained even with weak light. It is possible to move up and down while surely checking. Further, since the ladder main body 1 and the step 2 are made of fiber reinforced plastic (FRP), the ladder main body 1 and the step 2 have excellent corrosion resistance and strength resistance. In addition, the ladder
By attaching the scale 5 of the reflection character to the main body 1,
Even in the dark manhole Mh, it is easy to check the current position when ascending and descending and to check the depth of the water depth.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to ladders, particularly ladders used in sewerage facilities such as manholes.

[0002]

[Prior art]

 Conventionally, a ladder R used in a sewer system such as a manhole Mh is used for raising and lowering work inside the manhole Mh as shown in FIGS. 1 and 2, and is vertically stood. It is formed by two rod-shaped ladder bodies 1 and a plurality of steps 2 spanned over the ladder bodies 1, and the steps 2 have a round cross section. The ladder R is made of a metal material such as aluminum.

[0003]

[Problems to be solved by the invention]

 However, the interior of sewerage facilities such as Manhole Mh is often very humid, and the step surface of the ladder R is slippery because it is wet. The contact area is small, the feet slip and there is a risk of falling. In addition, since there is no complete lighting means inside the manhole Mh, the foot is illuminated with a weak light such as a flashlight, and the ladder R is moved up and down while checking the position of step 2. It is a danger. In addition, a scale is provided inside the manhole Mh to check the current position when ascending and descending and to check the depth of water such as sewage, but the inner wall surface of the manhole is wet. It is often difficult to confirm with weak light such as a flashlight.

Further, in recent years, corrosive gas such as sulfurous acid gas has often been included in wastewater such as sewage, and ladders composed of a metal material having low corrosion resistance are fragile due to rust. It is easy and dangerous. The present invention has been made to solve the above-mentioned conventional problems. The purpose of the present invention is to prevent slippage even when the interior of a sewage system such as a manhole is humid, and a flashlight or the like. It is an object of the present invention to provide a ladder which can easily confirm the position of a step or a scale even with weak light, and has excellent corrosion resistance and strength resistance.

[0005]

[Means for Solving the Problems]

 The invention according to claim 1 is a ladder composed of two rod-shaped ladder main bodies and a plurality of steps spanned over the ladder main bodies, wherein the steps have a rectangular cross section and a surface. A concave and convex portion is formed on the substrate.

According to a second aspect of the present invention, in the ladder according to the first aspect, a reflecting portion is formed on all peripheral surfaces of both ends of the step.

According to a third aspect of the present invention, in the ladder according to the first aspect, the ladder main body and the step are formed of fiber reinforced plastic.

According to a fourth aspect of the present invention, there is provided a ladder comprising two rod-shaped ladder bodies and a plurality of steps spanned by the ladder bodies, wherein the ladder body has a scale. It is characterized by being attached.

According to a fifth aspect of the present invention, there is provided the ladder according to the fourth aspect, wherein the ladder main body is provided with a scale of reflected characters.

[0010]

[Action]

 As shown in FIG. 3, the step 2 has a rectangular cross section and the uneven portion 2 a is formed on the surface, so that the step 2 can be safely moved up and down without slipping even in the case of high humidity. By forming the reflecting portion 2b on the lower side, it is possible to move up and down while confirming the position of the step 2 even with weak light. Further, since the ladder main body 1 and the step 2 are made of fiber reinforced plastic (FRP), the ladder main body 1 and the step 2 have excellent corrosion resistance and strength resistance. Further, as shown in FIG. 4, the ladder main body 1 is provided with a scale 5 for reflecting characters, so that even in a dark manhole Mh, it is possible to confirm the current position when ascending and descending and to confirm the depth of the water depth. Easier to remove.

[0011]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the ladder R according to the present invention includes two rod-shaped ladder bodies 1 that stand vertically and a plurality of steps that are wrapped around the ladder body 1. 2, a hanger portion 3 fixed to the upper end of the ladder main body 1 by bolts 6, and a stopper portion 4 provided at the lower end of the ladder main body 1 for preventing slippage. Here, the ladder main body 1, the step 2 and the hanger part 3 are formed of fiber reinforced plastic (FRP).

[0012] First, step 2, as shown in FIG. 3, both ends of the rectangular cross section columnar Step body 2 _1, a cylindrical rod portion 2 ₂ is formed, also when the lifting Rada -R in the top plan of the step body 2 ₁ to be used, in order to prevent slippage of the sole, a concave protrusion 2a is formed. Further, at both end entire peripheral surface of the step body 2 _1, reflection portion 2b such as fluorescent paint is formed. Steps body 2 ₁ If made of a metal material, fiber-reinforced plastic (FRP) coating is applied on its surface.

Here, in the step 2, by making the cross section rectangular, it is possible to receive the shoe sole with a large area when the ladder R is moved up and down. The fluorescent portion 2b, which is formed on both end entire peripheral surface of the step body 2 _1, becomes a mark when both rising and falling, it is possible to lift the safe Rada -R.

Furthermore, the rod portion 2 ₂ Rada - when mounting the step 2 to the body 1, holes 2 ₃ fitting the rod pin 6 for anti-rotation are bored, in FIGS. 5 and 6 as shown, ladder - the rod 2 ₂ at both ends of the steps 2 fitted to the main body 1, by fitting the rod pin 6 into the hole 2 _3, step 2 Ru mounted non-rotatably.

Further, since the ladder body 1 and the step 2 are made of fiber reinforced plastic (FRP), the resistance to corrosion by corrosive gas such as sulfurous acid gas or a detergent is improved, Since rust does not occur, long-term use is possible.

Next, as shown in FIGS. 2 and 4, a scale 5 is attached to the ladder main body 1 with a fluorescent paint or the like. Here, the scale 5 indicates the distance from the bottom of the manhole Mh. However, the scale 5 may indicate the distance from the entrance of the manhole Mh, and can be attached according to the scale of the sewerage system. By attaching the scale 5 to the ladder main body 1, unlike the conventional scale provided on the inner wall of the manhole Mh, it is possible to check the current position at the time of ascent and descent at hand and to check the water depth. The confirmation of the depth is facilitated, and the above-mentioned confirmation is further facilitated even in a dark manhole Mh by making the scale 5 a reflection character by a fluorescent paint or the like. The ladder body 1 can be extended by adding a plurality of ladders when the manhole Mh becomes deeper. In this case, the ladder body 1 is scaled by a number that is continuous with the plurality of ladder bodies 1 as the ladder body 1 is extended. The seal-shaped scale 5 can be attached to the ladder main body 1 so that the scale 5 can be attached.

Next, as shown in FIGS. 7 and 8, the hanger part 3 has a rod-shaped curved part 3a with one side curved, and a ladder main body on the other side of the curved part 3a. 1 is formed with a plate portion 3b which is fixed via a bolt 7, and the curved portion 3a is attached so as to protrude from the upper end of the ladder main body 1.

As shown in FIGS. 9 and 10, the stopper 4 is a quadrangular columnar rubber-like elastic body having an opening 4a at one end, and a lip shape 4b at the other end of the opening 4a. The opening 4a is fitted to the ladder main body 1 to prevent slippage when the ladder R is stood up as shown in FIG. In order to hook and hold the upper end of the ladder R of the present invention inside the manhole Mh, a hook 8 as shown in FIG. 11 is formed on the inner wall surface of the manhole Mh. The hook portion 8 may also serve as an FRP step member fixed to the wall surface of the manhole Mh.

[0019]

[Effect of the invention]

 The steps of the ladder have a rectangular cross section, and the unevenness is formed on the surface, so that even when the steps are wet due to high humidity, the soles can be moved up and down without slipping. By forming the reflective part on the peripheral surface, it is possible to move up and down while checking the position of the step easily even with weak light, thus enabling safe work. Further, since the ladder body and the steps are made of fiber reinforced plastic (FRP), they have excellent corrosion resistance and strength resistance and can be used safely for a long period of time. In addition, since the scale of the reflection character is attached to the ladder body, it is easy to confirm the current position when ascending and descending and to check the depth of the water even in a dark manhole.

[Brief description of the drawings]

FIG. 1 shows a ladder according to an embodiment of the present invention.
It is a figure showing the state where it was installed in a console.

FIG. 2 is a perspective view showing the entire ladder according to the embodiment of the present invention;

FIG. 3 is a perspective view of the steps according to the embodiment of the present invention.

FIG. 4 is a detailed view of a portion C and a portion D of FIG. 2;

FIG. 5 is a ladder of steps according to the embodiment of the present invention.
It is a longitudinal cross-sectional view which shows the joining part to a main body.

FIG. 6 is a view as seen from the direction of arrows EE in FIG. 5;

FIG. 7 is an enlarged view of a portion A in FIG. 1;

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a side view of a stopper portion used for a portion B in FIG. 1;

FIG. 10 is a front view of FIG. 9;

FIG. 11 is a plan view of a hook portion of the ladder according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladder main body 2 Step 2a Uneven part 2b Reflection part 3 Hanger part 4 Stopper part 5 Scale 6 Rod pin 8 Hook part

Claims (5)

[Utility model registration claims] 1. A ladder comprising two rod-shaped ladder main bodies and a plurality of steps spanned by the ladder main bodies, wherein the steps have a rectangular cross section, and the surface has irregularities. A ladder characterized by being formed. 2. The ladder according to claim 1, wherein a reflecting portion is formed on the entire peripheral surface at both ends of the step. 3. The ladder according to claim 1, wherein said ladder body and said step are formed of fiber reinforced plastic. 4. A ladder comprising two rod-shaped ladder bodies and a plurality of steps spanned by the ladder bodies, wherein a scale is attached to the ladder bodies. Ladder to do. 5. The ladder according to claim 4, wherein a scale of a reflection character is attached to the ladder body.