KR101211277B1 - Ladder with Folding Type of Caster - Google Patents

Abstract

The present invention relates to a ladder equipped with a wheel, the configuration is simple to reduce the occurrence of failures and to provide a ladder configured to be easily fixed so that the ladder does not move during operation.
The present invention for achieving the above object relates to a ladder having a scaffold arranged to be inclined at intervals up and down, and a ladder having the scaffold is fixed and the beam supporting the scaffold to stand upright with respect to the ground, the ground A plurality of second casters fixed to one side of the beams corresponding to the beams; a rotating plate rotatably mounted on the other side of the beams corresponding to the ground; a stopper positioned to interfere with the rotating plate; And a first caster mounted and rotating along the rotating plate, wherein the wheel of the first caster is supported to maintain the contact with the ground when the rotating plate contacts the stopper.

Description

Ladder with Folding Caster {Ladder with Folding Type of Caster}

The present invention relates to a ladder equipped with wheels, in particular, the configuration is simple to reduce the occurrence of failures and configured to be easily fixed so that the ladder does not move during operation.

Typically, wheels are mounted on the lower part of the ladder so as to move the ladder having a heavy weight constructed by welding steel beams to a place to be worked on, and the worker moves to a high place or works on a high place.

1 is a perspective view showing a ladder having a wheel according to the prior art, Figure 2 is a side view showing the ladder shown in FIG.

As shown in FIGS. 1 and 2, the ladder 1 includes inclined beams 5 for fixing a plurality of inclined scaffolds 3 and horizontal beams connected horizontally at the bottom of the inclined beam 5. (7), vertical beams (9) connected vertically in the horizontal beams (7) to support the inclined beams (5), and casters (10) mounted at four corners of the horizontal beam (7). It includes, and the clamp 20 for fixing the ladder (1) is mounted on the top of the inclined beam (5).

After the worker pushes and moves the ladder 1 to a place to work, the clamp 20 is fastened to an object in the workplace to fix the ladder 1. And the stopper 11 mounted on the caster 10 is fixed so that the wheel 13 of the caster 10 does not rotate.

In such a ladder, when the stopper is released, the caster's wheel can rotate and move so that the clamp is mounted as a double safety device on the top of the ladder.

The present invention has been invented to solve the problems of the prior art as described above, by folding the wheels so as not to contact the ground during work, thereby preventing the movement of the ladder to avoid the need of a double safety device clamp It is an object of the present invention to provide a ladder having a simply configured folding caster.

It is also an object of the present invention to provide a ladder having a foldable caster configured to be able to mount a simple caster without a stopper configuration by folding the wheel and avoiding contact with the ground.

The present invention for achieving the above object relates to a ladder having a scaffold arranged to be inclined at intervals up and down, and a ladder having the scaffold is fixed and the beam supporting the scaffold to stand upright with respect to the ground, the ground A plurality of second casters fixed to one side of the beams corresponding to the beams; a rotating plate rotatably mounted on the other side of the beams corresponding to the ground; a stopper positioned to interfere with the rotating plate; And a first caster mounted and rotating along the rotating plate, wherein the wheel of the first caster is supported to maintain the contact with the ground when the rotating plate contacts the stopper.

Further, according to a preferred embodiment of the present invention, the beams are inclined beams for fixing the scaffold, horizontal beams connected horizontally at the bottom of the inclined beams, vertical beams connected vertically in the horizontal beams to support the inclined beams And a guide beam positioned parallel to the inclined beam and extending below the horizontal beam, and an axis connected to the horizontal beam and mounted with the rotating plate.

In addition, according to a preferred embodiment of the present invention, the stopper is a scaffold located in the lowest layer of the scaffold.

Further, according to a preferred embodiment of the present invention, when the rotating plate is rotated so that the first caster is not supported on the ground, the end of the guide beam is in contact with the ground.

As described above, the ladder having a foldable caster of the present invention has the advantage that the ladder does not move even if the worker climbs on the ladder by folding the wheels in contact with the ground, the work is safer. In addition, since the clamp is not required as in the conventional ladder, the construction of the ladder can be simplified and the manufacturing cost can be reduced as well as easy to maintain and repair.

In addition, the ladder of the present invention may use a conventional caster. Therefore, although a caster equipped with a stopper is used in the related art, in the present invention, a conventional caster may be used and only three wheels may be mounted to reduce costs.

1 is a perspective view showing a ladder having a wheel according to the prior art,
2 is a side view showing the ladder shown in FIG.
3 is a perspective view showing a ladder according to the present invention,
FIG. 4A is a detailed view of portion A shown in FIG. 3,
4B is a side view of the first caster shown in FIG. 3,
Figure 5 is a side view of the folding wheel shown in Figure 4b folded state.
6 is a conceptual diagram illustrating a structure in which the shaft shown in FIG. 3 is fastened to a horizontal beam.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a ladder having a folding caster according to the present invention will be described in detail.

In the drawings, Figure 3 is a perspective view of a ladder according to the invention, Figure 4a is a detailed view of the portion A shown in Figure 3, Figure 4b is a side view of the first caster shown in Figure 3, Figure 5 is a view It is a side view of the folding wheel shown in 4b folded.

As shown in FIG. 3, the ladder 100 includes inclined beams 111 for fixing a plurality of scaffolds 101 disposed to be inclined, and a horizontal beam 113 connected horizontally at a lower end of the inclined beam 111. And vertical beams 115 that are vertically connected to the horizontal beams 113 to support the inclined beams 111, and are bent in parallel with the inclined beams 111 to extend below the horizontal beams 113. A guide beam 117, a shaft 119 positioned in parallel with the scaffold 101L in front of the scaffold 101L located on the lowermost floor among the plurality of scaffold 101, and mounted on the shaft 119. A rotating plate 120 rotating around 119 and interfering with the lowermost footrest 101L, a first caster 131 mounted on the rotating plate 120, and two mounted on the horizontal beam 113. The second caster 132 is included.

Hereinafter, a ladder having a folding caster configured as described above will be described in detail.

As shown in FIGS. 3, 4A and 4B, the plurality of scaffold 101 is welded to the inclined beam 111 to be inclined. A horizontal beam 113 having a rectangular structure is connected to the lower end of the inclined beam 111, and vertical beams 115 are connected to the front end of the horizontal beam 113 to support the upper end of the inclined beam 111. As described above, the structure in which the inclined beam 111, the horizontal beam 113, and the vertical beam 115 are connected to each other is rectangular.

The guide beam 117 is positioned in parallel with the inclined beam 111 and the lower end of the guide beam 117 is bent downward to be welded to the horizontal beam 113. Here, the end of the guide beam 117 is located lower than the horizontal beam 113. The lower level of the guide beam 117 will be described later in detail.

On the other hand, the shaft 119 is fixed inside the horizontal beam 113 formed in a rectangular structure. The shaft 119 is located in front of the footrest 101L located at the lowest floor and spaced apart in parallel with the lowest footrest 101L. Both ends of the shaft 119 are welded to the horizontal beam 113.

And the rotation plate 120 is mounted in the middle of the length of the shaft 119, the tip of the rotation plate 120 is deformed to surround the shaft 119 so that the rotation plate 120 rotates around the shaft 119 Possibly mounted. Here, the length of the rotating plate 120 is longer than the distance between the shaft 119 and the lowest footrest 101L. Therefore, when the rotating plate 120 rotates, it interferes with the top and bottom surfaces of the lowest footrest 101L. And the rotation plate 120 rotatably mounted to the shaft 119 is blocked from moving in the longitudinal direction of the shaft 119 by the projections (119D) welded to the shaft 119. The first caster 131 is mounted on the bottom of the rotating plate 120 configured as described above.

In addition, the front end of the rotation plate 120 is rotatably deformed and mounted on the shaft 119, and the upper surface of the rear end of the rotation plate 120, that is, the lowermost layer so that the first caster 131 and the second caster 132 are aligned. Height adjustment jaw 122 is formed in the contact portion of the footrest 101L. Here, the height adjustment jaw 122 is smaller than the diameter of the shaft 119. The reason is that as the height adjusting jaw 122 has a small diameter, the level of the rotating plate 120 is inclined so as to increase toward the rear, and thus, when the ladder 100 is reversed, the first caster 131 Even if the stone or the locking jaw is caught on the wheel 131W, the wheel 131W may smoothly pass the stone or the locking jaw. If the rotation plate 120 is positioned horizontally, even if a small stone is caught, the wheel 131W does not fall over the stone because the first caster 131 is folded. The first caster 131 is a directional caster that can be rotated 360 degrees, and the second caster 132 mounted at the front is a fixed caster and proceeds only in the front-rear direction.

 Therefore, when the rotating plate 120 rotates to contact the bottom surface of the lowest footrest 101L, the wheel 131W of the first caster 131 is positioned below the rotating plate 120 to be in contact with the ground. When the ladder is pushed in this state, the ladder 100 is pushed by two second casters 132 mounted at the front end of the horizontal beam 113 and one first caster 131 mounted at the shaft 119. Will be moved to.

On the other hand, when the operator stops the ladder 100 and wants to work on the ladder 100, the first caster 131, which is in contact with the ground, is lifted and then released. Then, as the rotating plate 120 rotates about the shaft 119, the first caster 131 rotates forward to be in contact with the ground.

Here, the lower level of the guide beam 117 described above is not lower than the horizontal beam 113 in contact with the ground when the first caster 131 is in contact with the ground. Therefore, when the wheel 131W of the first caster 131 is not in contact with the ground by rotating the first caster 131 forward, the lower end of the guide beam 117 of the ladder 100 is in contact with the ground.

As such, the second caster 132 located in front of the ladder 100 is in contact with the ground, but the first caster 131 located in the rear is not in contact with the ground, and thus the lower end of the guide beam 117 is in contact with the ground. Accordingly, when the operator climbs or lowers the footrest 101, the ladder 100 is stably positioned on the ground without moving.

Meanwhile, as shown in FIG. 6, both ends of the shaft 119 are not welded and fixed to the horizontal beam 113, and the clips 140 are mounted on both ends of the shaft 119, thereby allowing the shaft 119 to clip 140. ) May be fixed to the horizontal beam 113.

On the other hand, in the ladder described above, it is described that the rotating plate 120 interferes with the footrest 101L of the lowermost layer, but it is possible to limit the rotation of the rotating plate 120 by fixing the stopper among the horizontal beam 113 or other beams. Can be. When the stopper is fixed in place of the footrest 101L of the lowermost layer as described above, the rotation plate 120 is not rotated by the stopper and the rotation plate 120 and is restricted, so that the wheel 131W of the first caster 131 and Can remain in contact with the ground.

100: ladder
101: scaffolding
111: inclined beam
113: horizontal beam
115: vertical beam
117 guide beam
119: axis
119D: Protrusion
120: rotating plate
122: height adjustment jaw
131: first caster
131W: Wheels
132: second caster
140: Clip

Claims (4)

Scaffolds arranged inclined at an interval up and down, inclined beams fixing the scaffolds, horizontal beams connected horizontally at the bottom of the inclined beams, and vertical beams connected vertically in the horizontal beams to support the inclined beams As a ladder,
A plurality of second casters fixed to one side of the horizontal beam corresponding to the top of the inclined beam;
A rotating plate rotatably mounted on the other side opposite to one side of the horizontal beam on which the second caster is fixed;
A stopper positioned to interfere with the rotating plate,
A first caster mounted to the rotating plate and rotating along the rotating plate,
When the rotating plate is in contact with the stopper, a ladder having a foldable caster, characterized in that the wheel of the first caster is supported to maintain the state in contact with the ground.
The method of claim 1,
And a guide beam positioned parallel to the oblique beam and extending below the horizontal beam, and a shaft connected to the horizontal beam and on which the rotating plate is mounted.
The method according to claim 1 or 2,
The stopper is a ladder having a foldable caster, characterized in that the scaffold located on the lowest floor among the scaffolding.
The method of claim 2,
And the end of the guide beam is in contact with the ground when the rotating plate is rotated so that the first caster is not supported on the ground.

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