JP2982087B2 - Locking device for folding scaffold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding type scaffold locking device for securely and securely attaching a scaffold plate to a column with a simple structure.

[0002]

2. Description of the Related Art In the technical field of this type, a folding scaffold assembly of the type in which a scaffold plate is pivotally mounted between a plurality of cylindrical columns by a locking device comprising a suitable pivot means and bolts. Solids are well known. One example of such prior art is that shown in International Application No. PCT / AU85 / 00229 and its drawings. Such a locking device has an L-shaped link arm having an upper extension having two holes through which bolts penetrate at one end, and an upper extension having one end through which a pivot bolt penetrates at the other end. Is formed,
Opposite side ends of the scaffold plate are respectively mounted on the link arms, and the scaffold plate is fixed to each of the posts by penetrating each of the posts into these three holes and tightening bolts. I have. Link-type locking devices with such pivotal means have the disadvantage that the cylindrical struts are sometimes destroyed or crushed by the tightening torque applied to the bolts.

[0003]

SUMMARY OF THE INVENTION The present invention provides a foldable scaffold locking device having a simple structure which substantially avoids such disadvantages, namely, breakage or crushing of a column due to excessive tightening of bolts. The thing is aimed at.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a folding scaffold locking device according to the present invention comprises a cylindrical support having a cylindrical insert extending diametrically across a cylindrical wall. And a backing plate vertically attached to the side surface of the scaffold plate corresponding to the cylindrical support, and a bolt screwed through a through hole formed in the backing plate and an inner hole of the insert. The insert is characterized in that both ends of the insert are fixed to the cylindrical wall of the cylindrical support, and the bolt is provided with a screw thread.

According to a preferred embodiment of the present invention, a screw groove is formed in an inner hole of the insert so as to be screwed with a screw thread of the bolt, and the screw thread of the bolt is formed only at a tip portion. The tip of the bolt does not project from the insert and is screwed into a thread groove (19) provided in the inner hole. In this embodiment, at least one end face of the insert is formed so as to be flush with the outer surface of the tubular support.

Further, in the above embodiment, preferably,
The through hole is located on a perpendicular bisector of the backing plate,
In addition, the backing plate has a recess formed in the outer surface thereof, which is vertically hollowed in accordance with the cross-sectional shape of the cylindrical column, and a vertically long flat portion is left on both sides of the recess. And the backing plate projects downward perpendicular to the plane of the scaffold plate.

[0007] According to another preferred embodiment, the caul plate protrudes upward perpendicular to the plane of the scaffold plate.

According to yet another preferred embodiment, a tip portion of the bolt projects from the insert, and a nut is screwed into the thread of the projecting portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a folding scaffolding locking device according to the present invention will be described below. As can be seen in FIG. 1, the locking device 13 according to the invention is applied in particular to a scaffold 10 of the type consisting of a plurality of scaffolding plates 11 stacked in layers on four cylindrical supports 12. Opposite 2 of scaffolding board
Each corner of one side is pivotally attached to and fixed to the column. That is, the locking device 13 supports the cylindrical column 12 and each corner of the scaffold plate 11 in a relatively pivotable manner during storage or assembly, and maintains the entire scaffold in an upright state during use. Are integrally fixed. Since these locking devices are all of the same construction, only one of them is shown in detail in FIG. 2 and will be described below.

FIG. 2 shows a locking device 13 according to the invention.
The state in which the scaffolding plate 11 is attached to the cylindrical support 12 together with the structure described above is disclosed for explanation. The scaffolding plate 11 used in this embodiment is made of steel plate and its perimeter is entirely surrounded by hanging flanges.

The backing plate 14 is firmly attached to the corner of the outer surface of the flange formed on the side of the scaffolding plate by welding or the like so as to protrude perpendicularly and downward to the plane of the scaffolding plate. In addition, the backing plate 14 projects downward in this embodiment, but another embodiment projecting upward is also possible. The outer surface of the backing plate 14 is provided with a recessed portion 14a formed in a vertical direction corresponding to the cross-sectional shape of the column in order to further stably fix the column to the column 12. But,
The recess 14 a is not formed on the entire outer surface of the backing plate 14, and is parallel to each other on both sides of the recess in order to facilitate relative pivotal movement between the cylindrical column 12 and the scaffold plate 11. The vertically long plane portion 14b is left. Furthermore, this backing plate 1
4, a through hole 16 is provided on the vertical bisector for guiding and holding a bolt 15 described later.

In the prior art, a method similar to the above-mentioned contact plate or a method in which a tubular support is directly applied to a flange and both members are tightened from inside and outside with bolts and nuts has been used. As the tightening force is increased, the column is destroyed or crushed, which leads to a reduction in the mechanical strength of the column and the strength of the scaffold assembly itself, which may be a fatal hazard to the workers. . In view of this, the present invention overcomes the above-mentioned drawbacks of the conventional locking device by providing a cylindrical insert extending diametrically inside the cylindrical support, and provides a locking device having a simple structure. It is intended.

According to the invention, the tubular support 12 has a cylindrical insert 1 extending therein diametrically across its tubular wall.
8 are formed and the insert has
7 are oriented so as to be aligned with the through holes 16 of the backing plate 14. Further, the locking device 13 includes a bolt 15 that passes through the hole of the backing plate and is locked in a screw groove 19 formed in the inner hole 17 of the insert. However, the inner hole of the insert 18 does not necessarily need to be provided with the screw groove 19, and it is not possible to screw a nut to the tip of a bolt protruding outside the support and to fasten the contact plate to the support as in the prior art. is there. Further, the shape of the insert is not particularly limited to a cylindrical shape, but may be any shape as long as the bolt can penetrate into the inside, and it is possible to select an outer shape that can obtain a preferable result in structural mechanics as much as possible. . Most importantly, to increase the mounting strength and the mechanical strength of the column, the insert 18 is securely fixed to the cylindrical wall of the column 12. By doing so, the stress applied to the insert is diffused throughout the column, and the stress applied to the column is reliably transmitted to the insert, and it is possible to obtain extremely favorable mechanical characteristics as a whole scaffold.

As shown in FIGS. 3 to 5, the insert 18 described above is inserted into a hole 21 formed in a diametrical position of the cylindrical wall of the cylindrical support 12, and the front end face 22 of the insert has a cylindrical shape. It is formed so as to be flush with the outer surface 23 of the support 12, and when the cylindrical support is locked in the recess 14 a of the backing plate 14, the tightening stress by the bolt 15 is applied only to the front end face of the insert 18. Rather, it is dispersed over the entire contact surface of the cylindrical column, so that a stronger mounting strength can be obtained. Further, in this embodiment, the rear end face 24 of the insert is similarly formed so as to be flush with the outer surface 23 of the cylindrical column 12, so that any end face may come into contact with the recess. Made up of

As shown in particular in FIGS. 4 and 5, both ends of the insert 18 are firmly secured to the cylindrical wall of the column 12 by welding, brazing, or other rigid joining means, as described above. As described above, it can be understood that, besides the improvement of the structural mechanical strength of the scaffold itself, the strength of the column alone is also improved.

Also, as shown in FIG.
5 has a thread 20 cut only at the tip, and the other portion is a smooth cylinder leading to the head. This is because the bolt 15 is loosened to some extent prior to folding or assembling the scaffold, and
4 is loosely fitted in the through hole 16 and then, when the relative pivotal movement between the tubular support 12 and the scaffold plate 11 is started, the outer surface 23 of the tubular support comes out of the recess 14a of the backing plate 14 and It becomes rotatable along the vertically long plane portion 14b. At that time, the bolt 15 must move outward while being guided and held by the through hole together with the column, and at the same time act as a good pivot in the through hole 16.

However, when the wear of the through hole 16 can be neglected, that is, when the assembling and folding of the scaffold are not frequently required, the screw thread 20 may be formed by an ordinary bolt formed over the entire shaft of the bolt 15. It is clear that it is clear that use of the component does not cause any problem in function and it is easy to procure parts.

[0018]

As described above, although the folding scaffold locking device according to the present invention has many advantages, it can be used for assembling during use and for fixing or storing the scaffold plate and the tubular support. It has the simplicity that folding can be performed by turning only one bolt, and is substantially composed of three simple parts: an insert, a caul plate and a bolt, so that it is easy to manufacture and assemble. It also has the advantage of being. The most notable advantage is that the insert is fixed diametrically inside the column, which not only increases the mechanical strength of the column itself, but also tightens bolts or bolts and nuts directly to the column surface only. It is worth noting that it has the advantage of protecting it from breaking or collapsing, since it does not work, and that a more robust scaffold is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a folding process of a scaffold assembly of a type to which a folding scaffold locking device according to the present invention is applied.

FIG. 2 is a partial perspective view of an embodiment of the folding scaffolding locking device according to the present invention.

FIG. 3 is a partial perspective view showing a cylindrical column and an insert with a thread groove mounted inside the column in an embodiment of the folding scaffold locking device according to the present invention.

FIG. 4 is a partial front view of a cylindrical column in the embodiment of the folding scaffolding locking device according to the present invention.

FIG. 5 is a plan view of a cylindrical column in the embodiment of the folding scaffolding locking device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 scaffold 11 scaffold plate 12 cylindrical support 13 locking device 14 backing plate 14a recess 14b vertically long flat portion 15 bolt 16 through hole 17 inner hole 18 insert 19 screw groove 20 screw thread 21 hole 22 front end surface 23 outer surface 24 rear end surface

Claims (10)

(57) [Claims] 1. A tubular support (2) having a tubular insert (18) extending diametrically across a tubular wall, and corresponding to said tubular support, perpendicular to a side surface of a scaffold plate (11). The insert comprises an attached patch plate (14), and a bolt (15) screwed through a through hole (16) formed in the patch plate and an inner hole (17) of the insert. The both ends of (18) are fixed to the cylindrical wall of the cylindrical support, and the bolt (15) is provided with a screw thread (20). 2. An inner hole (17) of said insert (18).
2. A screw groove (19) screwed into a screw thread (20) of the bolt (15) is formed therein.
4. The locking device for a foldable scaffold according to claim 1. 3. The locking device for a folding scaffold according to claim 1, wherein a screw thread (20) is formed only at least at a tip portion of the bolt (15). 4. A tip of the bolt (15) is screwed into a thread groove (19) provided in an inner hole (17) without protruding from the insert (18). The foldable scaffolding locking device according to any one of claims 1 to 3. 5. The bolt (15) has a tip portion projecting from the insert (18), and a nut is screwed into the thread (20) of the projecting portion. Item 4. The folding scaffold locking device according to any one of Items 1 to 3. 6. At least one end face (22) of said insert (18) has an outer surface (2) of said tubular support (12).
The locking device for a foldable scaffold according to any one of claims 1 to 5, wherein the locking device is formed so as to be flush with (3). 7. The device according to claim 1, wherein the through-hole is located on a perpendicular bisector of the backing plate.
The locking device for a foldable scaffold according to any one of claims 1 to 6. 8. The backing plate (14) has a recess (14a) which is bored in its outer surface in a vertical direction corresponding to the cross-sectional shape of the cylindrical column (12), and The locking device according to any one of claims 1 to 7, wherein a vertically long flat portion (14b) is left on both sides of the recess. 9. The scaffolding plate (1) is provided with the backing plate (14).
9. The locking device for a folding scaffold according to claim 1, wherein the locking device protrudes downward perpendicular to the plane of 1). 10. The scaffolding plate (1) is provided with the backing plate (14).
The locking device for a folding scaffold according to any one of claims 1 to 9, wherein the locking device protrudes upward perpendicular to the plane of (1).