JP2021080803A - Over-turning prevention device for stepladder - Google Patents

Abstract

To provide an over-turning prevention device for a stepladder that facilitates supporting the stepladder on the ground in a better condition when supporting it in an auxiliary manner, and that can more reliably prevent the stepladder from over-turning.SOLUTION: An over-turning prevention device for a stepladder which is disclosed in the present application includes a rod-shaped support member 10, a mounting member 20, and a connecting mechanism 30. The mounting member 20 attaches the support member 10 to a stepladder 100. The coupling mechanism 30 rotatably connects the support member 10 to the mounting member 20 for rotation in two axial directions, a first direction X1 and a second direction X2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fall prevention device for a stepladder, and relates to a fall prevention device for a stepladder that assists the stepladder.

As a fall prevention tool for a stepladder that assists the stepladder, Patent Document 1 describes a fall prevention tool for a stepladder provided with a rod-shaped support member. In the fall prevention tool for stepladder described in Patent Document 1, the upper end of the support member is connected to the upper part of the support column in the stepladder, and the lower end of the support member is brought into contact with the ground so that the support member does not fall. The stepladder is supported. The length of the support member and the angle with respect to the strut are adjustable, and the angle at which the stepladder is supported on the ground is adjustable by the support member.

Jitsuto No. 3006956

However, in the fall prevention tool for a stepladder described in Patent Document 1, the position of the ground where the lower end of the support member abuts cannot be freely selected when the stepladder is installed at the optimum position and orientation for performing the work. There is a problem such as. For example, in order to stably support the stepladder when the ground is partially soft or partially inclined at the position where the lower end of the support member abuts, the support member It is necessary to reposition the lower end of the stepladder to support the stepladder on better ground.

However, in the fall prevention tool for a stepladder described in Patent Document 1, the position of the ground where the lower end of the support member abuts cannot be freely selected, and the stepladder remains installed in the optimum position and orientation for the work. Then, it may not be possible to stably support the stepladder.

The present invention has been made in view of the above problems, and an object of the present invention is to facilitate supporting the stepladder on the ground in a better condition when supporting the stepladder, and to prevent the stepladder from tipping over more reliably. The purpose is to provide a fall prevention device.

The fall prevention tool for a stepladder disclosed in the present application includes a rod-shaped support member (10), a mounting member (20), and a connecting mechanism (30). The mounting member (20) mounts the support member (10) to the stepladder (100). The connecting mechanism (30) rotatably connects the support member (10) to the mounting member (20) in the biaxial directions (X1, X2).

In the stepladder fall prevention device disclosed in the present application, the connecting mechanism (30) has a fixing mechanism (40). The fixing mechanism (40) non-rotatably fixes the support member (10) to the mounting member (20), and the shaft hole member (41) and the first rotating shaft (42). And the second rotation shaft (43). The shaft hole member (41) has a first shaft hole (41a) and a second shaft hole (41b). The second shaft hole (41b) extends in a direction intersecting with the first shaft hole (41a). The first rotating shaft (42) is inserted into the first shaft hole (41a), and the shaft hole member (41) is rotatably supported with respect to the mounting member (20). The second rotating shaft (43) is inserted into the second shaft hole (41b), and the support member (10) is rotatably supported with respect to the shaft hole member (41). Then, the fixing mechanism (40) non-rotatably fixes the shaft hole member (41) to the mounting member (20), and attaches the support member (10) to the shaft hole member (41). Fix it so that it cannot rotate.

In the stepladder fall prevention tool disclosed in the present application, the shaft hole member (41) has a pair of tightened portions (46) and a split tightening main body portion (47). The pair of tightened portions (46) are formed with the first shaft hole (41a), and are arranged so as to face each other with a predetermined gap. The second shaft hole (41b) is formed in the split tightening main body portion (47), and the second rotation shaft (43) is rotated by tightening the pair of tightened portions (46). Fix it impossible. Further, the fixing mechanism (40) includes a male screw portion (42a) formed on the first rotation shaft (42), a tightening member (44), and a lever member (45). The tightening member (44) is screwed with the male screw portion (42a) to tighten the pair of tightened portions (46). The lever member (45) is rotatably connected to the first rotation shaft (42).

The fall prevention tool for a stepladder of the present invention makes it easy to support the stepladder on the ground in a better condition when supporting the stepladder, and can prevent the stepladder from falling more reliably.

It is a perspective view which shows the fall prevention tool for a stepladder which concerns on embodiment of this invention. It is a front view which shows the attachment member which concerns on embodiment of this invention. It is a side view which shows the fall prevention tool for a stepladder of FIG. It is a front view which shows the fall prevention tool for a stepladder of FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. (A) It is a front view which shows the shaft hole member which concerns on embodiment of this invention. (B) is a cross-sectional view taken along the line BB of FIG. 6 (a). (C) It is a side view which shows the shaft hole member which concerns on embodiment of this invention. It is a front view which shows the fall prevention tool for a stepladder in a state different from FIG.

Hereinafter, the fall prevention tool for stepladders according to the embodiment of the present invention will be described in detail with reference to the drawings. Since the embodiments described below are preferable specific examples for carrying out the present invention, various technical restrictions are made, but the present invention particularly limits the invention in the following description. Is not limited to this embodiment unless otherwise specified.

<Embodiment>
A fall prevention tool for a stepladder according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view showing a fall prevention tool for a stepladder according to an embodiment. FIG. 2 is a front view showing the mounting member according to the embodiment. FIG. 3 is a side view showing the fall prevention tool for the stepladder of FIG. FIG. 4 is a front view showing the fall prevention tool for the stepladder of FIG.

As shown in FIG. 1, the fall prevention tool for a stepladder according to the embodiment assists the stepladder 100 so as to prevent the stepladder 100 from falling, and includes a rod-shaped support member 10 and a mounting member 20. And a connecting mechanism 30. The stepladder 100 in the illustrated example includes a support column 101 which is a vertical member, a tread 102 which is a horizontal member, a rotary metal fitting 103 which opens and closes the stepladder 100, an opening stopper 104, and a top plate 105.

In the embodiment, the support member 10 is configured so that the length can be adjusted, and the support member main body 11 having a large diameter square pipe shape, the expansion / contraction portion 12 having a small diameter square pipe shape, and the fastener for fixing the expansion / contraction portion 12 are fixed. Including tool 13.

The upper end of the support member main body 11 is connected to the mounting member 20 by the connecting mechanism 30. Further, the lower end of the support member main body 11 is opened so that the telescopic portion 12 can be inserted.

The telescopic portion 12 is fitted and inserted into the support member main body 11 so as to be movable in the longitudinal direction via the lower end opening of the support member main body 11. The total length of the support member 10 is adjusted by adjusting the protruding length of the telescopic portion 12 protruding from the lower end opening of the support member main body 11. Further, a foot portion 12a that comes into contact with the ground is attached to the lower end portion of the telescopic portion 12 so that the angle can be adjusted.

In the embodiment, the fastener 13 is a male screw having a knob, and is screwed in from the outside to the inside of the support member main body 11 to immovably fix the telescopic portion 12 to the support member main body 11. ..

As shown in FIG. 1, the mounting member 20 mounts the support member 10 to the stepladder 100, and in the embodiment, the mounting member 20 is mounted on the upper part of one of the four columns 101. , Attach the upper end of the support member 10.

Further, as shown in FIG. 2, the mounting member 20 has a connected portion 21 to which the support member 10 is connected and a grip portion 22 that grips the support column 101 of the stepladder 100.

The connected portion 21 of the mounting member 20 has a pair of bearing pieces 21a for axially supporting the shaft hole member 41 described later. The pair of bearing pieces 21a are formed with insertion holes 21b through which the first rotation shaft 42, which will be described later, is inserted. The shaft hole member 41 is arranged between the pair of bearing pieces 21a, and is rotatably supported by the mounting member 20 by the first rotating shaft 42.

The gripping portion 22 of the mounting member 20 includes a fixed piece 23 and a movable piece 24 that are arranged to face each other, a screw-type movable piece pressing portion 25 that presses the movable piece 24, and a screw-type strut pressing portion 26 that presses the strut 101. And have. The direction in which the movable piece pressing portion 25 presses the movable piece 24 and the direction in which the strut pressing portion 26 presses the strut 101 are orthogonal to each other, and the grip portion 22 grips the strut 101 in the biaxial direction and is a mounting member. 20 is fixed to the support column 101. Further, a cushioning member 27 such as urethane is appropriately arranged at a position on the grip portion 22.

In the embodiment, the fixed piece 23 and the movable piece 24 sandwich the support column 101 in the left-right direction on the stepladder 100, and fix the mounting member 20 to the support column 101. In the present specification, the left-right direction of the stepladder 100 means a direction in which the stepladder 100 is opened or closed (left-right direction in FIG. 4) with the rotating metal fitting 103 as the center. Further, as shown in FIG. 2, the fixed piece 23 and the movable piece 24 each have locking pieces 23a and 24a for locking the support column 101.

The movable piece pressing portion 25 of the mounting member 20 includes a handle 25a, a shaft portion 25b having a male screw, a support portion 25c, and a plate-shaped contact portion 25d. The support portion 25c has a female screw that is screwed with the male screw of the shaft portion 25b. When the handle 25a is rotated in a predetermined direction, the contact portion 25d presses the movable piece 24, and the support column 101 is sandwiched between the movable piece 24 and the fixed piece 23.

The support column pressing portion 26 of the mounting member 20 includes a handle 26a, a shaft portion 26b having a male screw, a support portion 26c, and a plate-shaped contact portion 26d. The support portion 26c has a female screw that is screwed with the male screw of the shaft portion 26b. When the handle 26a is rotated in a predetermined direction, the contact portion 26d presses the support column 101 toward the locking pieces 23a and 24a, and the support column 101 is sandwiched between the locking pieces 23a and 24a and the contact portion 26d. Will be done.

The connecting mechanism 30 connects the support member 10 to the mounting member 20 so as to be rotatable in the biaxial direction. In the embodiment, the biaxial directions are the first direction X1 shown in FIG. 3 and the second direction X2 shown in FIG.

As shown in FIG. 3, the first direction X1 is a direction along the front-rear direction (horizontal direction in FIG. 3) of the stepladder 100. In the present specification, the front-back direction of the stepladder 100 is a direction orthogonal to the left-right direction of the stepladder 100 and along the ground. As shown in FIG. 3, by rotating the support member 10 in the first direction X1, the position of the foot portion 12a in the front-rear direction of the stepladder 100 moves, and the support angle α of the support member 10 with respect to the ground G is adjusted. Will be done. The support angle α is preferably adjusted to an angle of 75 degrees or more and less than 90 degrees.

Further, as shown in FIG. 4, the second direction X2 is a direction along the left-right direction of the stepladder 100. By rotating the support member 10 in the second direction X2, the position of the foot portion 12a in the left-right direction of the stepladder 100 is adjusted.

In the mounting member 20 shown in FIG. 2, the distance D between the inner side surface 23b of the fixing piece 23 to which the support column 101 is pressed and the intermediate position between the pair of bearing pieces 21a is preferably 120 to 160 mm. It is more preferably 130 to 145 mm, and even more preferably 135 to 140 mm. By setting the interval D to the above numerical range, as shown in FIG. 4, the rotation center of the support member 10 in the second direction X2 is installed near the center position in the left-right direction of the general stepladder 100. It is possible to support the stepladder 100 more stably.

As described above with reference to FIGS. 1 to 4, according to the stepladder fall prevention tool of the embodiment, the connecting mechanism 30 rotates in the biaxial directions of the first direction X1 and the second direction X2. The support member 10 is connected to the mounting member 20 as much as possible. Therefore, in a state where the stepladder 100 is installed at the optimum position and orientation for performing the work, the position of the ground G with which the lower end portion of the support member 10 abuts can be freely selected, and the ground G partially becomes. Even when the stepladder is soft or partially inclined, it is easy to support the stepladder 100 with the ground G in a better state, and the stepladder can be prevented from falling more reliably.

Next, other embodiments of the present invention will be described with reference to FIGS. 5 to 7. FIG. 5 is a cross-sectional view taken along the line AA of FIG. FIG. 6A is a front view showing a shaft hole member according to the embodiment. FIG. 6B is a cross-sectional view taken along the line BB of FIG. 6A. FIG. 6C is a side view showing the shaft hole member according to the embodiment. FIG. 7 is a front view showing a fall prevention device for a stepladder in a state different from that of FIG.

As shown in FIG. 5, the connecting mechanism 30 according to the embodiment has a fixing mechanism 40 that rotatably fixes the support member 10 to the mounting member 20. The fixing mechanism 40 includes a shaft hole member 41, a first rotating shaft 42, a second rotating shaft 43, a tightening member 44, and a lever member 45. As described above, the shaft hole member 41 is arranged between the pair of bearing pieces 21a, and is rotatably supported by the first rotating shaft 42 on the mounting member 20 via the pair of bearing pieces 21a.

As shown in FIG. 6, the shaft hole member 41 has a first shaft hole 41a and a second shaft hole 41b. The second shaft hole 41b extends in a direction intersecting the first shaft hole 41a. In the embodiment, the second shaft hole 41b extends in a direction orthogonal to the first shaft hole 41a. Here, the "orthogonal direction" includes a case where there is an error of up to about 10 degrees.

Further, the shaft hole member 41 has a pair of tightened portions 46 and a split tightening main body portion 47. The pair of tightened portions 46 are formed with a first shaft hole 41a and are arranged so as to face each other with a predetermined gap. The split tightening main body 47 is formed with a second shaft hole 41b, and the second rotating shaft 43 is non-rotatably fixed by tightening the pair of tightened portions 46.

As shown in FIG. 5, the first rotating shaft 42 has a male screw portion 42a formed on the tip end side and a lever member 45 rotatably connected to the base end side, and functions as a split tightening bolt.

As shown in FIG. 5, the second rotating shaft 43 is non-rotatably fixed to the support member 10 by the fixing metal fitting 14 at the upper end of the support member main body 11.

The tightening member 44 is screwed with the male screw portion 42a of the first rotating shaft 42, and the pair of tightened portions 46 is tightened via the pair of bearing pieces 21a by the rotational operation of the lever member 45. In an embodiment, the tightening member 44 is formed from a nut. By tightening the pair of tightened portions 46 via the pair of bearing pieces 21a, the shaft hole member 41 is fixed to the pair of bearing pieces 21a, and the shaft hole member 41 cannot rotate with respect to the mounting member 20. It is fixed. Further, by tightening the pair of tightened portions 46, the diameter of the second shaft hole 41b becomes smaller, the second rotating shaft 43 is fixed to the shaft hole member 41 so as not to rotate, and the support member 10 Is non-rotatably fixed to the shaft hole member 41.

Further, as shown in FIG. 7, when the use of the stepladder 100 is finished, the support member 10 is fixed to the support column 101 by, for example, the hook-and-loop fastener tape 106. By fixing the support member 10 to the support column 101, the stepladder 100 can be put together in a compact shape with the stepladder fall prevention device attached to the stepladder 100, and the stepladder 100 can be stored in a relatively small storage space. Further, when the stepladder 100 is used again, the stepladder 100 can be immediately supported by the stepladder fall prevention tool without attaching the stepladder fall prevention tool.

As described above with reference to FIGS. 5 to 7, according to the stepladder fall prevention tool of the embodiment, the fixing mechanism 40 includes the shaft hole member 41, the first rotating shaft 42, and the second rotation. The shaft hole member 41 includes a moving shaft 43, and has a first shaft hole 41a and a second shaft hole 41b extending in a direction intersecting the first shaft hole 41a. Therefore, the support member 10 can be rotatably supported with respect to the mounting member 20 by a simple mechanism mediated by the shaft hole member 41, the mechanism can be simplified, and the cost increase can be suppressed.

Further, according to the fall prevention tool for stepladders of the embodiment, the shaft hole member 41 of the fixing mechanism 40 has a pair of tightened portions 46 and a split tightening main body portion 47, and is the first as a split tightening bolt. By rotating the rotating shaft 42, the support member 10 can be fixed to the mounting member 20 so as not to rotate. Therefore, by one-touch operation by the lever member 45, the support member 10 that can be rotated in the biaxial direction can be fixed, and the operability can be improved.

The embodiments of the present invention have been described above with reference to the drawings (FIGS. 1 to 7). However, the present invention is not limited to the above-described embodiment, and can be implemented in various embodiments without departing from the gist thereof.

100 ... Stepladder 101 ... Support 10 ... Support member 20 ... Mounting member 30 ... Connecting mechanism 40 ... Fixing mechanism 41 ... Shaft hole member 41a ... First shaft hole 41b ... Second shaft hole 42 ... First rotating shaft 42a ... Male screw Part 43 ... Second rotation shaft 44 ... Tightening member 45 ... Lever member 46 ... Tightened part 47 ... Split tightening main body

Claims (3)

Rod-shaped support member (10) and
A mounting member (20) for mounting the support member (10) to the stepladder (100),
A connecting mechanism (30) that rotatably connects the support member (10) to the mounting member (20) in the biaxial directions (X1, X2).
A fall prevention device for stepladders equipped with. The connecting mechanism (30) has a fixing mechanism (40) that non-rotatably fixes the support member (10) to the mounting member (20).
The fixing mechanism (40)
A shaft hole member (41) having a first shaft hole (41a) and a second shaft hole (41b) extending in a direction intersecting the first shaft hole (41a).
A first rotating shaft (42) that is inserted through the first shaft hole (41a) and rotatably supports the shaft hole member (41) with respect to the mounting member (20).
A second rotating shaft (43) that is inserted through the second shaft hole (41b) and rotatably supports the support member (10) with respect to the shaft hole member (41).
Including and
The claim that the shaft hole member (41) is non-rotatably fixed to the mounting member (20), and the support member (10) is non-rotatably fixed to the shaft hole member (41). The fall prevention tool for stepladders according to 1. The shaft hole member (41) has a pair of tightened portions (46) on which the first shaft hole (41a) is formed and arranged to face each other with a predetermined gap, and the second shaft hole (41b). Is formed, and has a split tightening main body portion (47) for fixing the second rotating shaft (43) non-rotatably by tightening the pair of tightened portions (46).
The fixing mechanism (40) is screwed into the male screw portion (42a) formed on the first rotation shaft (42) and the male screw portion (42a), and the pair of tightened portions (46) are screwed together. The fall prevention tool for a stepladder according to claim 2, further comprising a tightening member (44) for tightening the first rotation shaft (42) and a lever member (47) rotatably connected to the first rotation shaft (42).

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