JP2592582B2 - Scaffold for traveling work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scaffold for traveling work, and more particularly to a scaffold suitable for traveling on a work surface in which concave portions are mixed in a flat surface such as a keystone plate having a continuous cross section and a railroad crossing.

[0002]

2. Description of the Related Art Conventionally, as a scaffold movable in this kind of workplace, a rectangular three-dimensional frame is assembled by facing a pair of scaffold building frames, a plate is laid on an upper portion to form a work table, and four corners are formed. Attach a free caster to the base at the bottom of the column base,
What can be moved in all directions is used. However, although it is preferable on a work surface having no concave portion, on a keystone plate having rail-shaped concave portions or a railroad crossing surface, a free caster may fall into the concave portion, and a stable foothold can be established. The situation that cannot be obtained occurs. Such a problem can be reliably avoided by arranging a large number of free casters attached to the lower end of the column base over the entire lower surface of the plate on which the column base is erected, but this causes a remarkable increase in running resistance. Not practical. In the end, in order to prevent the running resistance from increasing without dropping, a reasonably necessary number of free casters should be arranged within the area of the lower end of each column base to prevent dropping and reduce running resistance. According to Japanese Utility Model Laid-Open Publication No. 59-165265, at least one free caster is disposed on the lower convex surface by arranging a free caster at each apex of a plane triangle. In order to increase the adaptability, as shown in FIG. 4, mounting holes 2,... At the center of the side, mounting holes 3,... Are formed. In this case, the mounting holes 4 may be formed at the center of the plane triangle 1, and the mounting holes 2 at the respective apexes may be formed as elongated holes. It may be 2 ', separately attached 5 may be drilled in the direction of the triangular lane, and the mounting hole 3 drilled at the center of each side may be a mounting hole 3 'formed of a long hole. 6, a mounting hole for a universal caster attached to 6,
.. Are set at each vertex of the plane triangle.

If the vertical distance X formed between the mounting hole 2 and the mounting hole 3 is designed to maintain a certain dimensional relationship between the widths of the ridges and valleys of the ridges of the keystone plate. It is good. However, even if a continuous uneven surface such as a keystone plate is changed, it is sufficient that the maximum number of the free casters provided on the wheel is seven, and the setting position is also regular. In the manufacture of the wheel portion, that is, in the manufacture of the bogie device as a whole, there is also an advantage that the variation in quality of the product can be eliminated.

[0004] However, in the above-mentioned proposal, "a plurality of free casters arranged at intervals at each corner of the bogie bridge the convex ridge surface of the keystone plate or at least one of the bridges. By being in contact with the surface,
This is to prevent the wheels from dropping into the groove at the corners of the bogie, whereby some of the plurality of free casters are disengaged from the convex ground contact state at the time of going over the groove during running of the bogie. May float in the air.

On the other hand, the swivel caster, as is well known, supports the axle support by a rotating shaft at a position deviated from a position immediately above the axle supporting member, thereby rotating a bidirectional rolling wheel by the turning operation of the rotating shaft. Thus, it is possible to freely roll in the direction of the surroundings without directionality. Therefore,
When the wheels of the universal caster are in contact with the ground, the direction in which the ground resistance is minimized with respect to the moving direction of the mounting trolley, that is, the rotation axis and the axle position are linear with respect to the moving direction. On the other hand, when the axle supports rotate smoothly due to the turning of the axle support, if the wheels float in the air or ride on small protrusions on the road surface, etc. Due to the inclination of the axle, the axle support body may inadvertently turn around the rotation axis.

Therefore, when one of the casters arranged relatively close to the caster group in the bogie device turns carelessly, the distance between the wheel grounding points on the casters is reduced. Or, a situation of elongation occurs. In such a case, the casters arranged at intervals corresponding to the bridging of the keystone plate in the groove of the keystone plate cannot maintain the set interval. There is a possibility that an unexpected situation of falling into the concave groove of the plate may occur. According to Japanese Utility Model Laid-Open Publication No. Sho 62-182804, the turning support shaft portions of the free casters in the caster group are integrally connected to each other in the same direction by aligning their directions. Proposals have been made to prevent inadvertent swiveling of the casters and to align the directions so as to always keep the installation interval between the casters constant.

[0007]

In the prior art described above, in the former case, the reason for losing the meaning of the reasonably calculated installation intervals of the adjustable casters may be lost due to the function of the adjustable casters. Although the latter has been modified, the improvement of the latter is intended to obliterate the greatest feature of the universal caster that it is easy to turn, and this restraint increases resistance, makes it difficult to use, and is impractical It will be.

[0008] Further, in the case where the former is the same and seven free casters are arranged, there is no guarantee of drop prevention as in the case of three, even though the number is increased. Because the setting positions of the free casters are regularly arranged at regular intervals, there is a high probability that a plurality of casters will be arranged on a plurality of straight lines (three are established as is clear from the figure) in parallel at the same time. This is because the probability of falling into the three concave stripes increases.
Even if there is something left on the hill of the keystone plate, the number will be small due to the high drop rate described above, and the number will be different from the number of free casters that are grounded on the other column bases. Due to the imbalance that rolling and rolling are forced, smooth movement cannot be expected, and it is good to ride on a mountain even at one point from the beginning. But,
Such a one-point support has a disadvantage that it is not smooth due to the same support load as described above.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to cross two valleys in a keystone plate necessary to avoid a situation in which only one central point rides on a mountain. The required number of free casters is set rationally under a low drop rate within a sufficient predetermined base area at the bottom of each column base, enabling reliable drop prevention and balanced smooth movement. It is intended to provide a scaffold for traveling work.

[0010]

In order to achieve the above-mentioned object, a scaffold for traveling work according to the present invention is provided within a frame area of a predetermined lower end of each column base sufficient to cross two valleys in a keyest plate. Six or more free casters are arranged on an elliptical locus drawn in the area of the base, and are adjacent and opposed to each other at different intervals. It is assumed to be set in.

[0011]

Since at least three wires connecting the opposing free casters dispersed within a predetermined area are not parallel to each other, the degree of traversing the parallel concave streaks of the keystone plate increases, and therefore all the wires are connected. The probability of a fall is remarkably reduced, a reliable fall prevention is achieved, and a stable ground contact on the adjacent mountain with a concave streak not only on the center but also on the adjacent mountain (for this reason, Due to the increase of at least the above three connections), the unbalance of each pedestal support is reduced, and smooth movement is achieved.

[0012]

An embodiment will be described with reference to the drawings. In FIG. 1, reference numeral 7 denotes an elliptical trajectory drawn within a predetermined pedestal area at the lower end of each column base sufficient to cross the two valleys 31, 31. As described above, if the free caster distributed configuration is within an area sufficient to cross the two valleys 31, 31, it is possible to avoid the mountain 32 riding only at the central point by securing uniform dispersion, and to avoid the two valleys 3
Satisfies the minimum requirements for stable three-point grounding between the legs 1,31.

[0013] Six free casters 8 on the elliptical locus 7
A to 8f are adjacent to each other at different intervals and face each other. Connections between the two are almost equally distributed in such a manner as to avoid the center point 9 of the ellipse. That is, in the distribution in the illustrated example, among the six equally-divided points 10a to 10f on the elliptical locus 7, the universal caster 8a is first arranged here starting from 10a, and the universal caster 8b is rotated clockwise from the equally-divided point 10b. Arrange in the foreground,
The next adjacent free caster 8c is disposed behind the equal point 10c, the free caster 8d is provided before the equal point 10d, the free caster 8e is provided behind the equal point 10e, and the free caster 8f is provided with the equal point 10f. Casters 8a that achieve randomness of large and small repeating intervals and face each other before
Each connection 11, 1 between -8d, 8b-8e, 8c-8f
Reference numerals 2 and 13 assume that the ellipse center 9 is avoided. If the number of free casters is odd, two opponents are assumed. This is because, as a result of various prototypes, the center connection is
This is because if it passes above, it turns out that the connection between the neighbors tends to be parallel.

The connection 2 formed between the free casters 8b-8c and 8e-8f adjacent to the center connection 11 described above.
Since 9 and 30 are not parallel to each other (different intervals),
In FIG. 4 described above, each of the vertices of the equilateral triangle and the six free casters arranged at the center of each side are formed at equal intervals and parallel lines 14,
Because of the convergence on the points 15 and 16, there is no increase in the probability of simultaneous dropping and the riding of the mountain 32 at only one central point, so that the drop rate can be significantly reduced and multipoint support over a wide range can be expected. This also eliminates the imbalance in the number of casters that can freely contact the ground on each pillar, and ensures smooth movement. The number of six is a minimum necessary for assuming the above-mentioned three connections for stable support in at least a predetermined plane, and the above-described purpose of decentralization is maintained. In that case, there is no problem with adding the casters within a range where interference between the free casters can be avoided.

FIGS. 2 and 3 are an introduction of the product of the present invention in which the casters can be freely arranged. The traveling work scaffold 17 is a rectangular three-dimensional frame facing a pair of scaffolding frames 18, 18. The three-dimensional frame is formed by a brace 19 and a handrail frame 2.
0, plate frames 24, 24, and single tubes 22, 22, etc. installed between bogie plates 21, 21 as bases on which the building frames 18, 18 stand, respectively. A handrail frame 23 for forming a take-out scaffold is attached to the frame 20. The single tube 22 is fixed by the clamp 25. Outriggers 26 on both sides of the trolley plate 21,
26 are equipped. Six free casters 28,... Are attached around the column base standing portions 27, 27 of the both-end building frame 18 of the bogie plate 21 in the manner described above with reference to FIG. It is not always necessary to make the column base standing portion 27 coincide with the elliptical center point 9. Since a free caster 28 is also provided on the column base standing portion 27 for directly receiving a load, the total number is seven. Since each member is reduced in size, it is preferable as this kind of product on the premise of assembly and disassembly.

[0016]

Since the present invention is configured as described above, it has the following effects. (1) Even with the minimum number of swivel casters, the degree of dispersion of the swivel casters is high, the probability of mounting on a limited keystone plate mountain crossing within a predetermined width range is increased, drop prevention and equal support of each pedestal. Ensures smooth movement. (2) It is preferable because the good motion of the free caster can be fully utilized without obliterating the caster, and a low-cost ready-made one can be used, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a universal caster distribution point of the present invention.

FIGS. 2A to 2C are a front view, a side view, and a plan view of a product embodying the present invention.

3A and 3B are a plan view and a side view of a bogie plate in the product of the present invention.

FIG. 4 is an explanatory view of a conventional universal caster distribution procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Planar triangle 2 Mounting hole 2 'Mounting hole 3 Mounting hole 3' Mounting hole 4 Mounting hole 5 Mounting hole 6 Bracket 7 Elliptical locus 8a-8f Free caster 9 Ellipse center 10a-10f 6 Equivalent points 11 Connection 12 Connection 13 Connection 14 Line 15 Line 16 Line 17 Running work scaffold 18 Scaffolding construction frame 19 Brace 20 Handrail frame 21 Bogie plate 22 Single tube 23 Handrail frame 24 Plate frame 25 Clamp 26 Outrigger 27 Column base standing portion 28 Free caster 29 Connection 30 Connection 31 Valley 32 Mountain

Claims (3)

(57) [Claims] 1. Within a predetermined pedestal area at the lower end of each pedestal sufficient for crawling two valleys in a keyest plate, six or more free casters are arranged on an elliptical locus defined within the pedestal area. A traveling work bogie characterized in that adjacent ones at different intervals and facing each other in a symmetrical configuration are set in a substantially uniform configuration in such a manner that the connections of the two avoid the center point of the ellipse. 2. The traveling work cart according to claim 1, wherein a swivel caster is also provided at the column base standing portion within the ellipse. 3. The traveling work cart according to claim 1, wherein six free casters are arranged on the elliptical locus.