JP2009046844A - Ladder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ladder quickly and safely transportable since a physical load on the user during the transportation is reduced. <P>SOLUTION: This ladder 1 comprises a ladder body 2 in which a roller 24 in contact with a ground 7 is attached to the bottom end, a support leg 3 having a base end rotatably attached to the intermediate part of the ladder body 2, having, at the top end, a caster 31 in contact with the ground, and having such a length that the ladder body 2 can be tilted relative to the ground 7 together with the roller 24 and supported in the movable state of the ladder body 2, and a locking means 5 installed in the ladder body 2 and locking the support leg 3 at a predetermined angle to the longitudinal direction of the ladder body 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ladder, and more particularly to a triple ladder mainly used during fire fighting activities.

Today, telescopic ladders are used for fire extinguishing and lifesaving activities in high places.
As an example of such a retractable ladder, there is a triple ladder described in Patent Document 1.

Such a triple ladder is required to have an allowable maximum load sufficient for a firefighter or the like to move up and down safely, and a solid structure is required to realize the sufficient allowable maximum load.
Therefore, the weight of the triple ladder itself is 20 kg to 45 kg.

In addition, in order for firefighters to be active at high altitudes, the total length of the triple ladder becomes 6 m to 9 m with the triple ladder extended.
Therefore, although the triple ladder is transported in a contracted state, the total length of the triple ladder is still 2 m to 4 m.
Utility model registration No. 3109801

In order to quickly transport such a heavy and long triple ladder, there is one in which a roller is attached to the lower end of the triple ladder.
When the roller contacts the ground, the triple ladder can be easily routed.

However, when only one point of the roller is in contact with the ground, it is necessary to bend down and lift the upper end side of the triple ladder placed on the ground in order to draw the triple ladder.
While the triple ladder is being routed, it must be pulled or pushed in the direction of travel while keeping the upper end of the triple ladder lifted.
Therefore, there is a problem that the physical load is large for the user who carries the triple ladder.
In addition, by lifting the upper end of the heavy and long triple ladder, the triple ladder becomes unstable, and it is difficult to carry it quickly and safely.

  Then, an object of this invention is to provide the ladder which reduces a user's physical load at the time of conveyance, and can be conveyed quickly and safely.

  In order to achieve this object, the ladder according to claim 1 has a ladder main body having a roller attached to the ground at the lower end, a base end rotatably attached to an intermediate portion of the ladder main body, and a distal end. A support leg having a length for supporting the ladder main body by tilting it with respect to the ground together with the roller in a state in which the ladder main body is movable and having a caster that comes in contact with the ground. Locking means for locking the leg at a predetermined angle with respect to the longitudinal direction of the ladder body.

  In the ladder of claim 2, the locking means can fix and release the support leg at a predetermined angle with respect to the longitudinal direction of the ladder body.

  According to a third aspect of the present invention, the ladder main body is provided with holding means for storing the support legs along the longitudinal direction of the ladder main body.

  According to a fourth aspect of the present invention, in the ladder according to the first aspect, support legs are respectively provided on both side surfaces of the ladder main body.

  According to a fifth aspect of the present invention, in the ladder according to the first aspect, the locking means is provided so as to incline and fix the support leg with respect to the ground.

  A ladder according to a sixth aspect is the ladder according to the first aspect, wherein the ladder main body is telescopic.

According to the ladder of the first aspect, the support legs support the ladder main body with the rollers inclined with respect to the ground.
Since the ladder main body is inclined with respect to the ground, it is not necessary to bend down and lift up the upper end side of the ladder, and it is not necessary to maintain the state in which the upper end side of the ladder is lifted when the ladder is routed.
Therefore, the physical load can be reduced for the user who carries the ladder.
Furthermore, since the casters of the support legs are also in contact with the ground in addition to the rollers, the ladder is stable, and the heavy and long ladder can be transported to a place where a rescue operation or the like is performed quickly and safely.
When the ladder is transported, it is sufficient that at least one of the roller or the caster is grounded even if both the roller and the caster are not grounded.
Therefore, even when one of the roller or the caster is caught in a step or a groove, the catch can be easily released by lifting the ladder main body using the other as a fulcrum.
The support leg is provided in the middle part of the ladder body, and the ladder can be turned around the position where the caster is grounded.
The turning radius when the ladder is turned around the caster is smaller than the turning radius when the ladder 1 is turned around the roller.
Thereby, the ladder can be swiveled even in a limited space.

According to the ladder of the second aspect, since the locking means can fix the support leg, the ladder body can be fixed and supported by being inclined with respect to the ground in a more stable state.
Thereby, a heavy and long ladder can be transported to a place where a rescue operation or the like is performed quickly and safely.
Further, since the fixing between the locking means and the support leg can be released, the support leg can be rotated to store the caster along the longitudinal direction of the ladder body.
In this way, since the locking means can fix and release the support legs, the operation of inserting and removing the support legs can be performed reliably.

According to the ladder of the third aspect, since the holding means accommodates the support leg along the longitudinal direction of the ladder body, the support leg does not get in the way when the ladder is lowered from a car or the like or when the ladder is raised to the car.
Therefore, the ladder can be handled more safely.

According to the ladder of the fourth aspect, since the support legs are provided on both side surfaces of the ladder main body, the support on the casters is stabilized.
Thereby, a heavy and long ladder can be transported to a place where a rescue operation or the like is performed quickly and safely.

According to the ladder of this fifth aspect, the support leg is inclined with respect to the ground.
If the support leg is inclined toward the lower end of the ladder body, it is possible to easily get over small steps and grooves when the user pulls with the tip side of the ladder body and can carry it quickly. .
Therefore, the physical load on the user who carries the ladder can be reduced.

  According to the ladder of the sixth aspect, the ladder can be transported to a place where the rescue operation or the like is performed quickly and safely, and fire extinguishing activities or lifesaving activities can be performed at higher places.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a ladder 1 according to an embodiment of the present invention, and shows a state where support legs 3 are fixed at a predetermined angle with respect to the longitudinal direction of the ladder body 2.
As shown in FIG. 1, the ladder 1 includes a ladder body 2, support legs 3, locking means 5, and holding means 6.

  The ladder body 2 includes a first ladder body 21, a second ladder body 22, and a third ladder body 23. The first ladder body 21, the second ladder body 22, and the second ladder body 22 are accommodated so that the second ladder body 22 can be accommodated in the first ladder body 21 and the third ladder body 23 can be accommodated in the second ladder body 22. The three ladder bodies 23 are successively smaller.

When using the ladder 1, the second ladder body 22 extends from the first ladder body 21, and the third ladder body 23 extends from the second ladder body 22.
After using the ladder 1, as shown in FIGS. 1 and 2, the second ladder body 22 is accommodated inside the first ladder body 21, and the third ladder body 23 is accommodated inside the second ladder body 22. Can be transported and stored.

A roller 24 is provided at one end of the first ladder body 21.
When transporting the ladder 1, the roller 24 comes into contact with the ground 7.

The support legs 3 are attached to both side surfaces of the first ladder body 21, respectively.
A base end of the support leg 3 is attached to an intermediate portion of the first ladder body 21 and is attached so as to be rotatable about a rotation shaft 32.
As will be described later, by rotating the support leg 3, the support leg 3 can be fixed along the longitudinal direction of the ladder body 2, and the support leg 3 is fixed with respect to the longitudinal direction of the ladder body 2. When it is fixed at a predetermined angle (FIG. 1), it has a length for supporting the ladder body 2 together with the roller 24 while being inclined with respect to the ground 7.

A caster 31 is attached to the tip of the support leg 3.
The caster 31 is in contact with the ground 7 in a state where the support leg 3 is fixed at a predetermined angle with respect to the longitudinal direction of the ladder body 2 (FIG. 1).
Since the rollers 24 and the wheels of the casters 31 rotate, the ladder body 2 can be moved in a state where the ladder body 2 is inclined with respect to the ground 7.

As shown in FIG. 3, the support leg 3 is provided with an engagement piece 4.
The engagement piece 4 has a shape obtained by bending a rod body having a circular cross section into an L shape, and its tip is bent from the support leg 3 toward the side surface of the ladder body 2.

Locking means 5 and holding means 6 are provided on a side surface of the first ladder body 21 around the rotation shaft 32, and the locking means 5 and holding means 6 have the same configuration. Is used.
When the leading end of the engaging piece 4 protruding in the lateral direction of the ladder body 2 enters a predetermined position of the locking means 5 and the holding means 6, the locking means 5 and the holding means 6 wrap around the leading end of the engaging piece 4. To fit.
By this fitting, the support leg 3 is restricted from turning around the turning shaft 32.

When the locking means 5 is engaged with the engagement piece 4, the support leg 3 can be fixed at a predetermined angle with respect to the longitudinal direction of the ladder body 2 (see FIGS. 1 and 4).
Moreover, the support means 3 can be fixed along the longitudinal direction of the ladder main body 2 because the holding means 6 fits into the engagement piece 4 of the support leg 3 (refer FIG.2 and FIG.5).

The locking means 5 and the holding means 6 have a releasing means for releasing the fitting with the engaging piece 4.
By releasing the fitting, the support leg 3 can turn around the turning shaft 32 again.

By providing the engagement piece 4 on the support leg 3, the degree of freedom of arrangement of the locking means 5 and the holding means 6 is increased.
Thereby, the locking means 5 and the holding means 6 can be arranged in consideration of the weight balance of the ladder 1 during transportation and the safety when the user moves up and down.

As shown in FIG. 1, the roller 24 and the caster 31 of the support leg 3 are in contact with the ground 7.
When the ladder 1 is transported, it is sufficient that at least one of the roller 24 or the caster 31 is grounded, even though both the roller 24 and the caster 31 are not grounded.
Therefore, even if either the roller 24 or the caster 31 is caught in a step or a groove, the catch can be easily released by lifting the ladder body 2 using the other as a fulcrum.

The support legs 3 are provided in the middle part of the ladder body 2.
The ladder 1 can be rotated around a position where the caster 31 is grounded.
The turning radius when the ladder 1 is turned around the caster 31 is smaller than the turning radius of the ladder 1 when the ladder 1 is turned around the roller 24. Thereby, the ladder 1 can be turned even in a limited space.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-described embodiments, and various modifications can be easily made without departing from the spirit of the present invention. It can be done.

It is a side view of the ladder which is one embodiment of the present invention, and shows the state where the support leg is fixed at a predetermined angle with respect to the longitudinal direction of the ladder body. FIG. 2 is a side view of the ladder of FIG. 1, showing a state where support legs are fixed along the longitudinal direction of the ladder body. It is a perspective view of the support leg and locking piece of the ladder shown in FIG. It is an enlarged view of the A part of FIG. FIG. 3 is an enlarged view of a portion B in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladder 2 Ladder main body 3 Support leg 4 Engagement piece 5 Locking means 6 Holding means 7 Ground 21 First ladder body 22 Second ladder body 23 Third ladder body 24 Roller 31 Caster 32 Rotating shaft

Claims (6)

A ladder body with a roller attached to the ground at the lower end, and
The base end is pivotally attached to the middle part of the ladder body, and has a caster that makes contact with the ground at the tip, and the ladder body is tilted with respect to the ground together with the roller while the ladder body is movable. A support leg having a length for supporting;
A ladder provided on the ladder body and having a locking means for locking the support leg at a predetermined angle with respect to the longitudinal direction of the ladder body.   The ladder according to claim 1, wherein the locking means can fix and release the support leg at a predetermined angle with respect to the longitudinal direction of the ladder body.   The ladder according to claim 1 or 2, wherein the ladder main body is provided with holding means for storing the support legs along the longitudinal direction of the ladder main body.   The ladder according to any one of claims 1 to 3, wherein the support legs are respectively provided on both side surfaces of the ladder body.   The ladder according to any one of claims 1 to 4, wherein the locking means is provided so as to lock the support leg in an inclined manner with respect to the ground.   The ladder according to any one of claims 1 to 5, wherein the ladder body is telescopic.

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