JPH08246776A - Ladder - Google Patents

Abstract

PURPOSE: To promote an improvement in the arbitrary usage of a ladder by installing an auxiliary member in and around the central part of a stably structural ladder body, and forming this auxiliary member into an expansible structure. CONSTITUTION: A ladder consists of a ladder body 3 attached with four stepping crossbars 2a to 2d to a long-size supports 1 and a reinforcing post 4 made up of a main post 7 projected out of a top part of the long-size supports 1. Then, in order to secure the stability of these long-sized supports 1, the lower part is expanded wide from the upside, while in order to prevent any possible falling into the ground and to help their reinforcement, falling-in preventing plate 5 is installed there. In addition, this reinforcing post 4 is made up of the hollow main post 7 and an expansible member 8 being stowable in a hollow part of the main post 7. Moreover, a lot of pin insertional holes 7a and through holes 8a are installed in the main post 7 and the expansible member 8 and thereby the main post 7 and the expansible member 8 both are made so as to be lockable in each optional position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder, and more particularly to a ladder suitable for collecting fruits such as tangerines and apples.

[0002]

2. Description of the Related Art Ladder and stepladder have been conventionally used to collect fruits such as tangerines and apples that have become trees.
A ladder consists of two long woods arranged in parallel with a number of footing crosspieces.The top of the long wood is leaned against the trunk of a tree for use. The stepladder provided with is used by opening a pair of ladders and making it stand on the ground.

In this way, the stepladder can be made to stand on its own, but the four points at the lower ends of the legs need to be in a substantially horizontal state, so that it is not convenient to use, especially in an orchard with a lot of mud. On the other hand, since the ladder is supported at two points and can be installed in any place, it cannot be used for tall branches because it needs to lean against a tree or a building.

[0006] A device that solves these problems and improves the safety and usability of ladders and stepladders is disclosed in, for example, Japanese Patent Laid-Open No. 56-6.
890, JP-A-62-185994, JP-A-63-117899, and JP-A-5-69299.

JP-A-56-6890 and JP-A-62.
In the ladder proposed in Japanese Patent Laid-Open No. 185994/1993 and Japanese Patent Application Laid-Open No. 5-69299, in addition to the ladder main body, supporting legs for supporting the ladder are provided, and a total of three points of two points of the ladder main body and one point of the supporting leg are provided.
By supporting it at points, it is possible to become independent without leaning against the building. In addition, JP-A-63-1178
In the ladder described in Japanese Patent Publication No. 99, the upper end of the ladder main body is bent, which enables stable leaning against a particularly low object.

The above-mentioned three-point-supporting ladder combines the convenience of stepladder with the functionality of the ladder, but especially when it is used in an orchard where the ground is loose, the supporting legs sink into the ground, which is extremely great. In that case, there is a risk of falling. In addition, it is necessary to fold and carry the support legs, which is a problem in terms of mobility.

In that respect, the ladder described in Japanese Patent Laid-Open No. 63-117899 bears a part of the weight of the leaned trees, and as a result, the weight at the bottom of the ladder becomes light, resulting in poor ground. It can be used in a relatively stable condition even in places.

[0008]

However, in the conventional ladder structure, a large number of footing crossbars are attached between long members arranged substantially parallel to each other. In many cases, it is not possible to install both of the long bars that are arranged apart from each other at a fixed position on the branch.
For this reason, there is a problem in terms of safety, such as using the ladder upright.

The present invention solves the above-mentioned problems in conventional ladders, and an object thereof is to provide a ladder that can be stably used even on trees with many branches, and that is not bulky and is relatively easy to carry. And

[0010]

In order to achieve the above object, a ladder of the present invention is a ladder main body having two long members to which a footing crosspiece is attached, and the ladder main body is provided at a substantially central portion of the ladder main body. It is characterized in that it is provided with an attachment pillar protruding from the material.

Here, the additional column is made of a hollow main material and an elastic material which can be accommodated in the hollow portion of the same main material so as to be expandable and contractable, and the additional column is subjected to anti-slip processing. it can.

[0012]

In the ladder according to the present invention, even if a tree is prominently branched, as in the conventional case, the long columns that are spaced apart from each other cannot enter by projecting the supporting columns for leaning against the long columns. As long as there is a space where a single pillar can enter, it will be possible to lean it up and use it.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view of a ladder which is an embodiment of the present invention.

In order to reduce the weight of the ladder of this embodiment, the ladder body 3 is made of hollow aluminum and has two long members 1 to which the footrest crosspieces 2a to 2d are attached, and the ladder body 3.
Of the footrest crossbars 2a to 2c, which is fixed to the center portion of the footrest crossbars 2a to 2c.

The long strips 1 arranged apart from each other have a structure in which they are spread downward from above and are more stable when installed.
A base plate 1a is provided at the lower end of the base plate 1a to prevent it from getting into the ground, and a lower surface of the lowermost crossbar 2d is similarly provided with an anti-penetration plate 5 to prevent it from getting into the ground and for reinforcement. .

The cross bars 2a to 2d are formed with irregularities for preventing slippage in the longitudinal direction, the lower part is widened downward and the upper part is narrowed according to the spread of the long strip 1, and they are fixed to the long strip 1 by welding.

The splint column 4 is composed of a hollow main member 7 and an elastic member 8 which can be housed in the hollow portion of the main member 7. As shown clearly in FIG. 2, a large number of elastic members 8 are provided in the longitudinal direction of the elastic member 8. The through hole 8a
The main pin 7 is aligned with the pin insertion holes 7a formed at the front and rear, and the fixing pin 10 is inserted into the pin insertion hole 7a.
Fixed by. Reference numeral 4a denotes a non-slip member formed on the surface of the elastic member 8 so that it can be stably installed without slipping when leaning against a branch of a tree or the like. Further, since the post 4 is expandable and contractible, the elastic material 8 can be contracted and used compactly in the case of a low branch, and can be extended and used in the case of a high branch.

Referring to FIG. 3, a detachable tip portion 9 is attached to the tip portion of the spar 4, and in the case of this embodiment, a rubber cap is provided for the purpose of damage to trees and safety during transportation. 9a is attached. The attachment structure of the elastic member 8 and the tip portion 9 is similar to that of the main member 7 and the elastic member 8 described above, and is detachable by the pin 8b.

Returning to FIGS. 1 and 2, 11 is a safety cord attached to the elastic member 8 through a loop, and when the branch of a tree that is leaning is particularly slippery, the safety cord 11 connects the elastic member 8 and the branch. By tying it, you can use it safely.

FIG. 4 is a perspective view showing another embodiment of the detachable tip portion. The tip portion 15 of FIG. 4 (a) is provided with an installation plate 15a formed at an angle so as to be in close contact with a building wall surface, , (B) is provided with a bending member 16a according to the curvature of the trunk of the tree, and such a structure enables safer use depending on the installed object.

FIG. 5 is an explanatory view showing a usage state of the ladder shown in FIG. 1, in which the splints 4 are expanded and contracted according to the height of the branches of the tree, and the spaces between the prosperous branches are sewn to lean on the desired branches. . As described above, according to the ladder of this embodiment, since the tip portion is one of the pillars 4, the ladder can be easily installed on any prosperous branch. The usage after leaning is the same as that of the conventional ladder.

[0022]

According to the present invention, the following effects can be obtained.

(A) A space more compact than that of a general ladder, but a space where a single pillar can enter, even in the case of a tree with many branches that cannot enter long-distance materials that are spaced apart from each other as in the conventional case If you have it, you can lean against it and use it.

(B) By making the side columns expandable,
When not in use, it can be made compact and transported.

(C) By applying anti-slip processing to the added pillar, the leaning ladder can be used safely without slipping.

[Brief description of drawings]

FIG. 1 is a perspective view of a ladder that is an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a main part of the ladder shown in FIG.

FIG. 3 is a perspective view showing a tip end portion of a support post.

FIG. 4 is a perspective view showing another embodiment of the tip portion of the spar column.

5 is an explanatory diagram showing a usage state of the ladder shown in FIG. 1. FIG.

[Explanation of symbols]

 1 Long material 1a Base plate 2a to 2d Foothold crossbar 3 Ladder body 4 Saddle post 4a Anti-slip 5 Anti-slip plate 6 Safety cord 7 Main material 7a Pin insertion hole 8 Elastic material 8a Through hole 8b Pin 9 Tip 9a Rubber cap 10 Fixed pin 10a Split pin 11 Safety cord 15,16 Tip portion 15a Installation plate 16a Bending member

Claims (3)

[Claims] 1. A ladder provided with a ladder main body having two long members to which a footing crosspiece is attached, and a leaning post that is provided substantially at the center of the ladder main body and protrudes from the long members. 2. The ladder according to claim 1, wherein the added pillar is made of a hollow main material and an elastic material that can be housed in the hollow portion of the main material, and is made expandable. 3. The ladder according to claim 1, wherein the added pillar has a non-slip process.