JP2008303694A - Tripod stepladder and stepladder assist - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly user-friendly tripod stepladder allowing a user to properly do work at a position nearer to an object of the work by only slightly modifying the conventionally available tripod stepladder. <P>SOLUTION: The tripod stepladder comprises a ladder section 1, a top section 2 located at the top end of the ladder section 1 and a strut 3 extended from the top section 2 in a direction different from the direction of the ladder section 1. In a stepladder main body A, the strut 3 can be folded to and developed from the ladder section 1. An engagement section 42 to be preferentially engaged with the object of the work in the state of folding the strut 3 to the ladder section 1 side or moving the strut 3 in the folding direction is provided on the top section 2, and the ladder section 1 is leaned to the object of the work with inhibiting the ladder section 1 from at least moving laterally by using the engagement section 42. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tripod stepladder and a stepladder assisting tool that are more appropriately installed.

  Conventionally, a quadruped stepladder, a tripod stepladder or the like is widely known as a stepladder. Among them, the tripod stepladder is especially self-supporting with three legs, so it is excellent in stable installation on uneven land in the garden, and where many obstacles such as garden stones and garden trees are mixed, and work at high places such as planters Widely used as a tool.

  As shown in FIG. 4, the conventional tripod stepladder includes a ladder portion 1 constructed by installing a crosspiece 12 between leg posts 11, 11, a top portion 2 attached to the upper end side of the ladder portion 1, and A support column 3 extending from the top 2 in a direction different from the ladder unit 1 is provided, and the support column 3 is configured to be folded and unfoldable with respect to the ladder unit 1. Then, the figure which is grounded at three points by opening and placing the support column 3 and standing up to the original purpose has a triangular pyramid shape.

  The method of using the tripod stepladder will be described. For example, when pruning a plant or a fruit tree, as shown in FIG. 5, the support column 3 side is set toward the tree B or the like as a work object. Then, the worker climbs up the ladder unit 1 at a required height, and performs a pruning operation on the branch br and the like while standing on the ladder unit 1 at an arbitrary height. The worker who climbs the ladder unit 1 secures a scaffold for work while moving up and down, left and right on the ladder unit 1 according to the progress of the work, but toward the trunk b of the tree B in a normal posture. Since they face each other, in addition to work on the front, if the direction of the body is changed, a wide-angle work range can be secured in three directions including the left and right directions.

The structure of this type of tripod stepladder is well known, not to mention exemplification, but if it is intended to exemplify recent literature, there is one such as Patent Literature 1 which aims to stabilize the installation state.
JP 2002-309878 A

  By the way, depending on the purpose of the work, there is a case where it is desired to make the ladder part 1 as a scaffold as close as possible to the work object. However, as shown in FIG. 5, the column 3 extending in a direction different from the ladder portion 1 cannot be approached beyond the position where it interferes with the root of the trunk b. May be unavoidable to open.

  In such a case, as shown in FIG. 6, a tripod stepladder is disposed approximately 90 degrees sideways to bring the ladder portion 1 closer to the trunk b. However, in this case, as shown in FIG. 7, the position of the worker W with respect to the trunk b changes as the ladder unit 1 is climbed, and in addition, the body must face 90 ° to face the trunk b. Therefore, an unnatural work posture is forced, and a wide-angle work in three directions becomes difficult, and the ladder part 1, the support column 3, and the operator easily interfere with the branch br. Although the thing of patent document 1 is made | formed for the objective different from this invention, since it uses the support rod for assistance other than a support | pillar, it becomes what is more likely to interfere with a trunk etc. .

  The present invention has been made paying attention to such a problem, and it is possible to perform work appropriately at a position closer to the work object by adding some improvements to the conventional tripod stepladder. It is an object of the present invention to provide an excellent tripod stepladder and a stepladder assistance tool therefor.

  In order to achieve this object, the present invention takes the following measures.

  That is, the tripod stepladder of the present invention includes a ladder portion, a top portion located on the upper end side of the ladder portion, and a support column extending in a direction different from the ladder portion from the top portion, and the support column is folded with respect to the ladder portion, With respect to the stepladder body configured to be deployable, an engagement portion that preferentially engages with the work object in a state where the column is folded toward the ladder portion or moved in the folding direction is provided at the top portion. The ladder portion is configured to be able to lean against the work object at least so as not to be laterally displaced through the engaging portion.

  With such a configuration, even if the ladder portion is arranged so as to face the work object, it is avoided that the support column interferes with the work object. It is possible to secure an appropriate time when climbing to. In addition, a working range in three directions including the left and right is secured, and it is possible to effectively avoid an installation state in which the lower branch becomes an obstacle.

  In order to be able to selectively take the mode of normal use and the mode of ladder-like use, a stepladder assisting device having an engagement portion is detachably attached to a part of the top portion. It is desirable.

  In order to optimize the gap with the work object, it is preferable that the mounting position of the stepladder assistance tool with respect to the top portion is variable and the distance from the top portion to the engaging portion of the stepladder assistance tool is adjustable. .

  In order to improve the convenience of handling, the engaging part is integrated into the top part, so that it is located in an unobstructed part when used as a normal stepladder, and can be taken out to the side of the top part if necessary. It is convenient to configure it.

  As a concrete embodiment, a work object is a tree, and the engaging part has a curved shape or a bent shape so as to be partly held along the outer periphery of the trunk of the tree. In this case, the degree of bending or bending can be effectively exerted by preventing the lateral deviation if the trunk is slightly engaged even if the thickness of the trunk is slightly different. However, if the curvature or bending is larger than the diameter of the trunk, a lateral shift may occur. Therefore, it is set so that the curvature and bending are appropriate for a relatively small trunk diameter assumed in the normal handling range. It is desirable to keep it.

  Further, the stepladder assistance tool of the present invention is detachable from the top of the stepladder main body, has an engaging portion that extends from the top to the side and preferentially engages with the work object. The tripod stepladder of the present invention can be effectively constructed by attaching it to the top of the stepladder main body as it is or after making some improvements.

  Since the present invention has the configuration described above, it is possible to selectively use the original use state of the tripod stepladder and the use state like a ladder, thereby providing further freedom in the installation state in the field, It is possible to provide an excellent tripod stepladder and a stepladder assistance tool that dramatically improve workability related to a work at a high place performed by a plant craftsman or the like.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, the conventional tripod stepladder shown in FIG. 4 is used as a stepladder body A, and the stepladder auxiliary tool 4 shown in FIG.

  As described with reference to FIG. 4, the stepladder body A includes a ladder portion 1, a top portion 2 provided on the upper end side of the ladder portion 1, and a column 3 extending from the top portion 2 in a direction different from the ladder portion 1. I have.

  The ladder portion 1 is constructed by laying a plurality of crosspieces 12 at a predetermined interval between a pair of pedestal columns 11 and 11, and provides a scaffold when an operator ascends and descends to perform a pruning operation or the like.

  As shown in an enlarged view in FIG. 1, the top portion 2 is a frame member 21 that spans a frame 22 parallel to the crosspiece 12. The top portion 2 is integrally provided on the upper end side of the ladder portion 1. Therefore, it is possible to use the system in which the worker sits down and works.

  The ladder portion 1 and the top portion 2 are appropriately reinforced using a reinforcing pipe (not shown).

  On the other hand, the support column 3 is attached to a part of the frame frame 21 of the top portion 2 via a fitting pipe 31 so as to be rotatable. The support column 3 can be folded and expanded with respect to the ladder unit 1. In a state in which the ladder portion 1 is opened and installed, the entire stepladder has a substantially triangular pyramid shape shown in FIG. In addition, the point provided with the appropriate structure required for independence including the stopper which prevents the leg opening more than fixed is the same as the past.

  With respect to such a stepladder main body A, in the present embodiment, as shown in FIGS. 1 and 2, two pipe members 23 are fitted below the top portion 2 in a direction perpendicular to the frame member 22. It is integrally attached in a state that does not hinder the behavior of 31. This pipe material 23 is provided so that one opening end 23a is located under the frame frame 21 of the top part 2, and has the pin hole 23b opened below in the intermittent position of a longitudinal direction. The stepladder assistance tool 4 is detachably attached to the open end 23a.

  The stepladder auxiliary tool 4 has an insertion portion 41 that can be fitted into the opening end 23a of the pipe member 23 on the base end side that is bifurcated, and has a partial arc shape so that the tip end side is substantially Y-shaped in plan view. The insertion portion 41 has a pin hole 41a having the same pitch as the pin hole 23b of the pipe member 23, and is continuously formed on the outer surface of the engagement portion 42. A wavy or serrated irregular portion 42a is formed. Of course, the concave and convex portion is not limited to such a shape as long as lateral shift can be prevented.

  Then, the insertion portion 41 of the stepladder auxiliary tool 4 is inserted into the inside through the opening end 23a of the pipe member 23, and a pin (not shown) is inserted into the pin holes 41a and 23b with a required insertion depth, thereby FIG. As shown, the stepladder assisting tool 4 protrudes substantially horizontally toward the direction away from the ladder 1 so that it can be attached and fixed. The amount of protrusion can be adjusted depending on which position of the pin holes 41a and 23b is made to coincide with each other. If the number of pin holes is increased, more stages can be adjusted.

  In this way, the stepladder auxiliary tool 4 is attached to the stepladder main body A, and the stepladder 3 is brought close to the tree B or the like, which is a work object, in a state where the column 3 is folded toward the ladder unit 1 or moved in the folding direction. 3, the engaging portion 42 is preferentially engaged with a trunk b such as a tree B that is a work object, and the ladder portion 1 is connected to the tree that is the work object via the engagement portion 42. It is possible to lean against the trunk b such as B so as not to be laterally displaced.

  Thus, even if the ladder part 1 is arranged facing the tree B or the like that is the work object, the support column 3 is prevented from interfering with the tree B or the like, so that the ladder part is compared to that of FIG. 1 can be placed closer to the tree B or the like, and when climbing the ladder portion 1, the work can be performed with an appropriate space between the trunk B of the tree B and the like. In addition, since the worker who climbs the ladder section 1 takes a posture facing the trunk b, unlike the state of FIG. 6, a working range is secured at a wide angle in the front and left and right sides, and FIG. As shown, it is possible to effectively avoid the inconvenience that the worker's body comes off the trunk b and the inconvenience that the lower branch br gets in the way as it climbs.

  In particular, since the stepladder assistance tool 4 provided with the engaging portion 42 can be detachably attached to a part of the top portion 2, the stepladder assistance tool 4 is removed to remove the stepladder main body A when unnecessary. It can be used as a normal tripod stepladder shown in FIG. 4 and FIG. 5, and when necessary, it can be used as a ladder as shown in FIG. Further, if the structure of the top portion 2 is the same, it is possible to use the same stepladder assistance tool 4 as the stepladder main body A for each of the tripod stepladders having different heights.

  In this case, when standing on a ladder, unlike the case where it is self-supporting, it is not possible to adjust the gap with the work object as it is. Since the distance in the horizontal direction from 2 to the engaging portion 42 of the stepladder assistance tool 4 can be adjusted, it is possible to ensure an appropriate interval at the site.

  In particular, the work object is a tree B or the like, and the engaging portion 42 is curved so as to be partly held along the outer periphery of the trunk b of the tree B or the like. A lateral shift can be prevented appropriately, and a stable use state can be secured.

  The stepladder assisting tool 4 is detachable from the top 2 of the stepladder main body A, and has an engaging portion 42 that extends sideways from the top 2 and preferentially engages with the work object. Therefore, if there is an attachment portion such as the pipe member 23 on the top 2 of the existing stepladder main body A, it may be attached as it is, and if such a portion does not exist, an attachment portion such as the pipe member 23 is added. The tripod stepladder of the present invention can be effectively constructed by attaching the stepladder assistance tool 4 with some improvements.

  The specific configuration of each unit is not limited to the above-described embodiment.

  For example, the attachment / detachment structure of the stepladder auxiliary tool 4 may be a fixing structure using a fixing tool such as a clamp or a belt in addition to a fitting structure between pipes.

  In addition, it is also effective that the engaging portion is integrated into the top portion so that the engaging portion is located at an unobstructed portion when used as a normal stepladder and can be taken out to the side of the top portion as necessary. Hereinafter, although it demonstrates based on FIG. 8, FIG. 9, the ladder part is abbreviate | omitted in these figures including FIG. 10 mentioned later.

  For example, as shown in FIG. 8, two sides of the frame frame 21 are projected from the frame to form an open end 21p, and the open end 21p is bent to the same direction from both ends of the curved engaging portion 142. 142a is inserted, and if necessary, the engaging portion 142 can be pulled out and fixed at a predetermined pulling position as shown in FIG. Such an integral built-in type is convenient for handling because the engaging portion 142 is always attached to the main body of the stepladder.

  FIG. 9 shows another modified example of an integral built-in type. In this tripod stepladder, a part 21x of the frame frame 21 constituting the top part 2 can be rotated together with the frame member 22x as shown in Fig. 10 (a)-> Fig. (B), Fig. (B)-> Fig. (A). The frame member 22x is placed in a normal position so as not to get in the inside of the frame frame 21 and provides an environment in which the operator can sit down. When rotated, the position is fixed by an appropriate lock structure or latch structure. A part of the frame member 22x also serves as a curved engaging portion 22y, and the engaging portion 22y is brought out to the side of the top portion 2 by the above rotation, and is engaged with the trunk in the same manner as in the above embodiment. The ladder portion can be leaned so as not to be laterally displaced. Also in this case, as shown by an imaginary line in FIG. 5B, it is desirable that the position of the engaging portion 22y is variable through a projecting and retracting operation so that the space between the trunk can be adjusted. Needless to say, it is preferable to provide an uneven portion on the engaging portion 21y.

  Further, as shown in FIG. 10, a part of the frame frame 21 itself constituting the top portion is deformed so as not to hinder the rotation operation of the support column 3 to be an engaging portion 21z. It is also effective to preferentially engage the joint portion 21z with the trunk or the like. It is desirable for the engaging portion 21z to be provided with an uneven portion as described above.

  In addition, the specific shape, structure, size, and the like of each part can be variously modified without departing from the spirit of the present invention.

The perspective view which shows one Embodiment of this invention. The partial bottom view which shows the vicinity of the top part of FIG. The side view which shows the use condition of the embodiment. The perspective view which shows the conventional tripod stepladder. The side view which shows the use condition of the tripod stepladder. The figure which shows the other use condition of the tripod stepladder. The figure which shows the other use condition of the tripod stepladder. The figure which shows other embodiment of this invention. The figure which shows other embodiment of this invention. The figure which shows embodiment other than the above of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ladder part 2 ... Top part 3 ... Support | pillar 4 ... Stepladder assistance tool 42, 22y, 21z ... Engagement part A ... Stepladder body B ... Work object (tree)
b ... trunk

Claims (6)

A stepladder body comprising a ladder portion, a top portion located on the upper end side of the ladder portion, and a post extending from the top portion in a direction different from the ladder portion, the post being folded with respect to the ladder portion and configured to be deployable. On the other hand, an engagement portion that preferentially engages with the work object in a state where the column is folded toward the ladder portion or moved in the folding direction is provided on the top portion, and the ladder portion is provided via the engagement portion. A tripod stepladder configured to be able to lean against a work object so as not to be laterally displaced. The tripod stepladder according to claim 1, wherein a stepladder support tool having an engaging portion can be detachably attached to a part of the top portion. The tripod stepladder according to claim 2, wherein a mounting position of the stepladder assisting tool relative to the top is variable, and the distance from the top to the engaging portion of the stepladder assisting tool is adjustable. The tripod stepladder according to claim 1, wherein the engaging portion is integrally incorporated in the top portion, is located at a position where it does not get in the way when used as a normal stepladder, and can be taken out to the side of the top portion as needed. The tripod stepladder according to any one of claims 1 to 4, wherein the work object is a tree, and the engagement part is a curved or bent one that is attached so as to be held partially along the outer periphery of the trunk of the tree. A tripod stepladder according to claim 2 or 3, comprising an engaging portion that is detachable from the top of the stepladder main body and extends sideways from the top to engage with the work object preferentially. A stepladder aid characterized by that.

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