JPH09328981A - Ladder column assisting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the right and left tilt of a ladder when set on an inclined ground. SOLUTION: The first and second clamps 27 mounted on one column 11 out of a pair of columns of a ladder 10, a first assisting column 31 locked by the first and second clamps 27, the third and fourth clamps 28 mounted on the other column 13 out of a pair of columns of the ladder 10 and a second assisting column 33 locked by the third and fourth clamps 28 are provided, so that the adjustment is allowed even on an inclined or level-different ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column support tool for a ladder, and more particularly to a column support tool that can substantially adjust the length of the column of the ladder.

[0002]

2. Description of the Related Art A ladder usually has a shape in which two horizontal columns (vertical frame, vertical beam) are provided with horizontal beams (stepping beam steps) at arbitrary intervals, so that a person can move up and down. It is used by leaning against structures and buildings.

[0003]

However, in these conventional ladders, the pair of columns have the same length on the left and right, assuming that they are used on a flat ground or floor.
When the props on the left and right are placed on the sloped ground, uneven ground, wasteland, steps of stairs, etc., one of the props of the ladder floats in the air, and the ladder tilts or falls,
It is unstable, and people cannot move up and down. Therefore, in order to compensate for the shortage of the length of one of the columns, the column is placed on an appropriate stand. However, without a suitable solid platform, the ladder will become unstable, causing it to tip or slide. For this reason, there are many dangers when the operator moves up and down the ladder, and the safety is impaired, so that the operator cannot safely move the ladder up and down. Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned conventional example and to provide a ladder support tool for a ladder that allows the ladder to be safely lifted and lowered even on an inclined ground, a ground with steps, etc. is there.

[0004]

In order to solve the above problems, the structure of the first invention of the present application is the first and second clamps attached to one of the pair of columns of the ladder, and the first and second clamps. A first auxiliary column that is locked by the first and second clamps, third and fourth clamps that are attached to the other column of the pair of columns of the ladder, and are locked by the third and fourth clamps. And a second auxiliary strut, which is a ladder strut auxiliary tool.

According to the structure of the first invention, the first auxiliary column is locked by the first and second clamps attached to one column of the pair of columns of the ladder, while the pair of columns of the ladder is provided. Third and fourth attached to the other of the columns
Since the second auxiliary pillar is locked by the clamp, the ladder is not tilted to the left or right by adjusting the locking positions of the first auxiliary pillar and the second auxiliary pillar according to the situation of the ground inclination or unevenness. Can be

Further, in the structure of the second invention, in the structure of the first invention, the first clamp is inserted into the hollow portion of the first horizontal rail fixed between the pair of columns of the ladder. The third clamp is connected to one end of the rod, the third clamp is connected to the other end of the first rod, and the second clamp is inserted into the hollow portion of the second cross rail fixed between the pair of columns of the ladder. The second clamp is connected to one end of the second rod, and the fourth clamp is connected to the other end of the second rod.

With the structure of the second invention, in addition to the function of the first invention, the first rod is inserted into the hollow portion of the first horizontal rail fixed between the pair of columns, and the first and third rods are inserted. Since the clamps are connected to both ends of the first rod, the first and third clamps can be firmly fixed to the columns of the ladder. Similarly, the second rod is inserted into the hollow portion of the second cross rail fixed between the pair of columns of the ladder, and the second and fourth clamps are connected to both ends of the second rod. The second and fourth clamps can be firmly fixed to the columns of the ladder.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cutaway front view of the first embodiment. FIG. 2 shows the front of the main part of the above embodiment, FIG. 3 shows the plane of the main part of the above embodiment, and FIG. 4 shows the bottom surface of the main part of the above embodiment. In the ladder 10 shown in FIGS. 1 to 4, a pair of columns 11, 1
Cross rails 15, 16 and the like are fixed at a predetermined interval between the three.
The leg end tool 12 supports the lower end of the column 11, and the leg end tool 14 supports the lower end of the column 13. The rod 20 is a horizontal rail 15, 16
Are inserted into the hollow portions 15a and 16a. A circular handle 21 is formed on the left end of the rod 20 in the drawing, and the clamp 2
7 is connected to the left end of the rod 20 in the figure. Bolt 2
2 is screwed into the screw hole 20a at the right end of the rod 20 in the drawing, and the clamp 28 is connected to the right end of the bolt 22 in the drawing.
The nut 23 is screwed to the bolt 22 and is fastened between the support columns 11 and 13 and the rod 20 via the large washer 24 to fix the rod 20 to the ladder 10. The strip plate 2
5 includes a set of nuts 26 for bolts 22 (strips 25
Through a hole (not shown). ), It is possible to loosen the screw engagement between the rod 20 and the bolt 22 by turning the handle 21 while holding the strip plate 25. Therefore, the rod 20 can be easily removed from the ladder 10.

The pipe-shaped auxiliary column 31 includes two clamps 2.
It is fixed in parallel with the column 11 by 7. Leg end tool 32
Supports the lower end of the column 31. On the other hand, the pipe-shaped auxiliary column 33 is fixed in parallel with the column 13 by two clamps 28. The leg end tool 34 supports the lower end of the column 33. In the clamp 27, the movable portion 27b is the base portion 27.
A rivet 27e is rotatably attached to a with a rivet 27e as a rotation center, and a bolt 27c is rotatably attached to a base portion 27a with a rivet 27f as a rotation center. When the nut 27d screwed to the bolt 27c is tightened, the clamp 27 can lock the auxiliary column 31 between the base portion 27a and the movable portion 27b. The structure of the clamp 28 is also the above-mentioned clamp 2.
It is the same as the structure of 7.

With the above structure, the first auxiliary column 31 is locked by the first and second clamps 27 attached to one column 11 of the pair of columns of the ladder 10, while the pair of columns of the ladder 10 is connected. Since the second auxiliary column 33 is locked by the third and fourth clamps 28 attached to the other column 13 of the columns, the first auxiliary column 31 and the second auxiliary column 33 are locked.
The position of the first and second auxiliary columns 31, 33 is adjusted appropriately according to the situation of the slope or unevenness of the ground 41 by adjusting the locking position of the ladder 41 so that the posture of the ladder 10 is adjusted to the left and right (the horizontal rail 15, 16 longitudinal direction). Furthermore, since the first rod 20 is inserted into the hollow portion 15a of the first horizontal rail 15 and the first clamp 27 and the third clamp 28 are connected to both ends of the first rod 20, the first clamp 27 The third clamp 28 can be firmly fixed to the columns 11 and 13 of the ladder 10. Similarly, the second rod (the same as the first rod) 20 is connected to the second cross rail 1
Since the second clamp 27 and the fourth clamp 28 are connected to both ends of the second rod 20, the second clamp 27 and the fourth clamp 28 are firmly fixed to the ladder 10. It can be fixed to the columns 11 and 13.
Therefore, even if the ground 41 is inclined, the auxiliary columns 31,
By adjusting the position where 33 is fixed to the ladder 10 by the clamps 27 and 28, the ladder 10 can be used stably. In addition, in FIG. 1, since the ground 41 is in the lower right direction in the figure, the position of the auxiliary support column 33 is set to the auxiliary support column 3
It is below the 1 position.

FIG. 5 shows a modification of the place of use of the first embodiment. In FIG. 2, a gutter 43 is formed in the ground 42. Further, the ground 42 is lower on the right side of the side groove 43 in the figure than on the left side of the side groove 43 in the figure. The columns 13 of the ladder 10 are located on the gutters 43, but the columns 31, 3
3 allows the ladder 10 to be used stably despite the presence of the side groove 43.

FIG. 6 shows a second embodiment of the present invention. The rod 20b shown in FIG. 6 is a modified example of the rod 20 in the first embodiment. The rod 20b is inserted into the hollow portions 15a, 16a of the horizontal rails 15, 16.
The bolt 22a is the screw hole 20c at the left end of the rod 20b in the figure.
The clamp 27 is fixed to the bolt 22a. On the other hand, the bolt 22b is screwed into the screw hole 20d at the right end of the rod 20b in the figure, and the clamp 28 is fixed to the bolt 22b. A nut 23a screwed to the bolt 22a is in contact with the column 11 of the ladder 10 via the large washer 24a, and a nut 23b screwed to the bolt 22b is in contact with the column 13 of the ladder 10 via the large washer 24b. Therefore, by tightening the nuts 23a and 23b, the rod 20b
Can be fixed to the ladder 10. Further, as in the first embodiment, the auxiliary columns 31, 33 are clamped to the clamp 2
By fixing with 7 and 28, the ladder 10 can be stably used even on the inclined ground (corresponding to the ground 41 in FIG. 1) as in the first embodiment. In this case, the handle 21, the strip 25, etc. in the first embodiment are omitted, the rod 20b is light and small, and is used as a permanent attachment of the auxiliary columns 31 and 33. However, even if it is permanently installed, if the attachment is no longer needed due to a change in the application of the ladder 10, etc.
b can be removed from the ladder 10.

FIG. 7 shows a third embodiment. In the ladder 50 shown in FIG. 7, the cross rail 5 is provided between the pair of columns 51 and 53.
5, 56, 57, etc. are fixed. The leg end tool 52 supports the lower portion of the support column 51, and the leg end tool 54 supports the lower portion of the support column 53. The mounting portion 61a of the two clamps 61 is the support column 51.
It is attached by bolts 61b and 61c. Further, the attachment portions 62a of the two clamps 62 are attached to the support column 53 with bolts 62b and 62c. The auxiliary column 63 is fixed in parallel with the column 51 by two clamps 61. The leg end tool 64 supports the lower portion of the auxiliary column 63. Further, the auxiliary column 65 is fixed in parallel with the column 53 by the two clamps 62. The leg end tool 66 supports the lower portion of the auxiliary column 65. Incidentally, 44 is the ground.

With the above structure, the clamps 61 and 62 are permanently installed on the columns 51 and 53 of the ladder 50. Others are the same as those in the above-described first embodiment. In this case, since the left side of the ground 44 in the figure is lowered, the position of the auxiliary column 63 is lower than the position of the auxiliary column 65.

FIG. 8 shows a fourth embodiment. FIG. 8A shows a plane of the mounting plate, and FIG. 8B shows a state in which the clamp is fixed to the column of the ladder using the mounting plate. In FIGS. 8A and 8B, the first mounting plate 72
The second mounting plate 73 and the second mounting plate 73 are sequentially stacked and fixed to the side surface of one of the columns 71 of the ladder 70. It should be noted that the first mounting plate 72 has holes 72a facing downward in order from the upper side in the drawing.
Hole 72b, hole 72c, hole 72d, hole 72e, hole 72f,
Holes 72g and 72h are formed, and holes 73i, holes 73a, and holes 7 are formed in the second mounting plate 73 in order from the upper side to the lower side in the drawing.
3b, hole 73c, hole 73d, hole 73e, hole 73f, hole 7
3g, 73h and 73j are formed.

Bolts 74 are holes 73b in the second mounting plate 73,
It is inserted so as to penetrate through the hole 72b of the first mounting plate 72 and the hole 71a of the support column 71, and is fixed with a nut 75.
Similarly, the bolts 76 are attached to the holes 73g of the second mounting plate 73,
It is inserted so as to penetrate through the hole 72g of the mounting plate 72 and the hole 71b of the support column 71, and is fixed with a nut 77. The clamp 78 is fixed to the second mounting plate 73 by the bolt 78a through the hole 73i, and the clamp 79 is fixed to the second mounting plate 73 by the bolt 79a through the hole 73j.
The clamps 78 and 79 fix the auxiliary support column 80 (corresponding to the auxiliary support column 33) as in the first embodiment.
An auxiliary column is fixed to the other column (which is paired with the column 71) (not shown) of the ladder 70 by a clamp like the column 71.

With the above configuration, the first and second mounting plates 7
Clamps 78 and 79 are attached to the column 7 of the ladder 70 by the number 2 and 73.
1, the auxiliary column 80 is locked by the clamps 78 and 79. Similarly, an auxiliary column is fixed to the other column (which is paired with the column 71) of the ladder 70, which is not shown, by a clamp like the column 71. Others are the same as the above-described first embodiment. If the ladder 70 is made of wood or fiberglass, the ladder 70
Since the horizontal rails of the ladder are not hollow,
The structure is such that the mounting plates 72 and 73 are separately mounted on the unit 1. For this reason, a total of four bolt holes are drilled in the left and right columns 71 of the ladder 70 by using a drill or the like, and mounting plates 72 and 73 as permanent attachment fittings are fixed to the columns 71. The fourth embodiment has fewer components than the second embodiment and can further reduce the weight, but on the other hand, the application of the ladder 70 itself is changed, and the clamps 78, 79 are generated. When the attachment metal fitting of No. 1 is unnecessary and is removed, the bolt holes 71a and 71b of the column 71 remain.

FIG. 9 illustrates the leg end tool 82 (corresponding to the leg end tool in each of the above embodiments). In FIG. 8, a bolt 84 rotatably connects the lower portion of the ladder column or the auxiliary column 81 and the leg end tool 82. Therefore, the leg end tool 82 supports the lower end of the column 81 via the bolt 84. The direction of the leg end tool 82 can be freely changed according to the ground condition. A slip stopper 83 is added to the lower surface of the leg end tool 82.

[0019]

[Effects of the Invention] According to the ladder support tool of the first invention of the present application, even if the ground on which the ladder is installed is inclined,
You can prevent the ladder from tilting left or right. Therefore, the ladder can be stabilized even on the inclined ground. Furthermore, by installing one auxiliary column on each of the left and right columns of the ladder, it is possible to secure the required leg length of the column of the ladder that is compatible with any ground surface such as uneven surfaces, inclined surfaces, and stairs. . Therefore, a stable ladder can be leaned against. In addition, the locking positions of the left and right auxiliary columns can be easily adjusted to correspond to the level difference of the ground up to about 30 cm on the left and right. Further, since the auxiliary column is attached to the column with the clamp, the difference between the locking positions of the left and right auxiliary columns can be adjusted in millimeters. Further, since the ladder support tool of the present invention has a sturdy structure, it does not impair the original strength of the ladder. Furthermore, when the auxiliary support column is attached to the outside of the pair of support columns of the ladder, the width of the support column is substantially widened, so that the landing width of the ladder is widened. Therefore, the stability of the ladder is improved. Further, the ladder support tool of the present invention can be used on flat ground. Furthermore, the second
According to the ladder support tool for the ladder according to the invention,
In addition to the effect of the invention described above, it is possible to firmly fix the strut support tool of the ladder to the strut of the ladder.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a first embodiment of the present invention.

FIG. 2 is a front view of a main part of the first embodiment.

FIG. 3 is a plan view of a main part of the first embodiment.

FIG. 4 is a bottom view of an essential part of the first embodiment.

FIG. 5 is a modification of the use of the first embodiment.

FIG. 6 is a front view of a main part of the second embodiment.

FIG. 7 is a front view of the third embodiment.

FIG. 8 is an explanatory diagram of the fourth embodiment.

FIG. 9 is a perspective view of a leg end tool used in each of the embodiments.

[Explanation of symbols]

 10 Ladder 11, 13 Strut 15 Horizontal cross 15a Hollow part of horizontal cross 16 Horizontal cross 16a Hollow part of horizontal cross 20 Rod 27, 28 Clamp 31, 33 Auxiliary support

Claims (2)

[Claims] 1. A first and second clamp attached to one of the pair of columns of the ladder, a first auxiliary column locked by the first and second clamps, and a pair of the pair of columns of the ladder. A support pillar support tool for a ladder, comprising: third and fourth clamps attached to the other support pillar, and second auxiliary support pillars locked by the third and fourth clamps. 2. A first clamp is connected to one end of a first rod inserted into a hollow portion of a first cross rail fixed between a pair of columns of a ladder, and a third clamp is connected to the first rod. The second clamp is connected to the other end of the second rod, and the second clamp is connected to one end of the second rod inserted into the hollow portion of the second cross rail fixed between the pair of columns of the ladder, and the fourth clamp is connected to the second clamp. The support tool for a ladder according to claim 1, wherein the support tool is connected to the other end of the second rod.