JP2005282319A - Stepladder for garden tree - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stepladder for a garden tree, which overcomes the following defects: since a trifurcated stepladder for use in the pruning of the garden tree, the harvesting of a fruit tree, etc. is made larger with an increase in height, it is inconvenient to fold or move; a rear support cannot be installed in a position to maintain stability, when a worker performs work in the state of facing a trunk in a directly opposite position in the pruning of the garden tree; and the trifurcated stepladder often breaks or damages a branch when brought as close to the trunk as possible, on account of it. <P>SOLUTION: A ladder part 6 is used as a part of the support of the trifurcated stepladder, so that downsizing can be achieved. The ladder part 6 and the supports 7 and 8 is fixed or made expandable/contractible, and an upper part is provided with handrails 12 and 13, so that an effective height of the stepladder can be utilized up to its limit. The ladder part 6 and the supports 7 and 8 are made movable near the upper part by using a universal fitting 9 etc. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stepladder for planting used when working at a high place such as pruning a tree or harvesting a fruit tree.

As a stepladder for planting, a three-pronged stepladder as shown in Fig. 1 has been used for a long time, and a step bar (or board) passed between two struts as a ladder is used as a ladder. The other one is movable and can be freely installed to some extent, and is stable and widely spread. However, it is ideal for the three-pronged stepladder that the deployment angle of the three struts should be around 120 degrees due to its characteristics at the time of installation, but as the stepladder is raised, the interval between the bottoms of each side must be increased. In reality, when folding or moving the three-pronged stepladder, it is limited by the width of the bottom part of the ladder part, and the angle of the ladder part is much smaller than 120 degrees, so that it is in the direction facing the operator. Has the disadvantage that it is unstable or the horizontal direction becomes unstable.
JP 2001-329941 A

  Also, when pruning a plant, when working toward the center of the trunk, the ladder of the trifurcated stepladder is fixed between the two columns, and the movable column is stable unless it is installed in the center of the plant. However, due to its structure, sometimes the branch was broken or damaged when the movable support was installed.

  In view of these points, while maintaining stability, which is the original characteristic of a three-pronged stepladder, it is convenient to fold or move it, effectively use the stepladder to the top, and not damage the plant during work. It is to provide a compact stepladder for planting.

  In the present invention, three fixed or extendable struts are installed in the vicinity of the upper part so as to be freely movable to some extent, and are configured into a three-pronged type, and the ladder part is a parallel ladder or an extendable ladder. It is possible to fix or attach to one or more of the three columns, and to include a column including a ladder portion in the three columns.

  The stability, which is a major feature of the three-pronged stepladder, can be made compact when folded, without any discomfort compared to the conventional three-pronged stepladder, and can be stored conventionally by making the support and ladder extendable. Things that are inconvenient when moving can be made easier, and the telescopic work makes it easier to work on tall trees such as gardens.

  Even if the height of the stepladder changes, the width of the ladder can be kept up to the top with a constant width, so the convenience as a stepladder can be enhanced, and the ladder is on the column, so other columns are planted It can be installed in such a way that it can be sandwiched, and while maintaining the stability of the trifurcated stepladder, operations such as pruning can be performed without damaging the plant.

  By providing a handrail at the upper end of the stepladder, it becomes possible to safely perform work on the stepladder including the uppermost step, and the effective height of the stepladder is increased.

  Ladder is also popular in ordinary households. By simply attaching the column to the ladder, it has the function of a three-pronged stepladder and can be easily pruned.

  The aim of making it compact when folded while improving stability was realized by focusing on the function of the original ladder and using the three-pronged stepladder strut itself as a ladder.

  FIGS. 2A and 2B illustrate a three-pronged stepladder according to the present invention. FIG. 2A shows the state of use, FIG. 2B shows the state when folded, and FIG.

  The ladder portion 6 or the support columns 7 and 8 can be fixed or extendable, and the extendable type can freely change the height of the trifurcated stepladder.

  A three-pronged stepladder can be constituted by the support column 11 of the ladder portion and the other two support columns 7 and 8, and the deployment angle of each of the support columns can be set around 120 degrees and is stable in all directions.

  When folded, the width is almost determined by the width of the ladder portion as shown in FIG. 2B, and the width does not change from the upper end to the lower end, which is convenient for movement or storage.

  The conventional three-pronged stepladder shown in FIG. 1 could only use a ladder from the top to a few steps, but by attaching a handrail 12, it can be used in a stable place near the center of the three-pronged stepladder. The work can be performed safely, and the effective use height of the trifurcated stepladder is increased.

  Moving the three-pronged stepladder according to the change in the work place is unexpectedly troublesome, and the ladder part is removable, so that only the ladder part can be replaced without changing the position of the column depending on the work place. Just work will be faster.

  If the development preventing metal fitting 10 is attached at a plurality of locations according to the height of the three-pronged stepladder, the strength of the support can be assisted.

  When folded, it is compact and convenient to transport, and can be provided with a three-pronged stepladder that is stable during use, considers the safety of the operator, and can be used at high places.

It is a schematic diagram of a conventional three-pronged stepladder, (a) is a front view when installed, (b) is a side view at that time, (c), (d) are a front view and a side view when folded FIG. It is explanatory drawing of this invention goods, (a) shows the mode at the time of installation, (b), (c) is the front view and side view when it folds. (Example 1)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladder 2 Ladder column 3 Back column 4 Swivel bracket 5 Unfolding bracket or chain 6 Ladder part 7 Strut 8 Column 9 Swivel bracket 10 Unfolding bracket or chain 11 Ladder column column 12 Handrail 13 Handrail

Claims (5)

  A planting stepladder whose ladder is part of a three-pronged stepladder strut.   The stepladder for planting according to claim 1, wherein the ladder portion is fixed to or removable from the support.   The stepladder for planting according to claim 1, wherein each strut and the ladder part can be individually expanded and contracted.   A stepladder with a handrail at the top.   A planting stepladder that functionally becomes a three-pronged stepladder by attaching two fixed or telescopic struts to the upper end of a conventional ladder including a telescopic type via a detachable instrument.