JPS6018647Y2 - Steel pipe fixing mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fixing mechanism for steel pipes, and more particularly to a fixing mechanism whose height and circumferential position angle can be adjusted.

[Prior art]

The inventor of this invention has already disclosed the basic technical idea in Utility Model Publication No. 38-20129 as a steel pipe fixing mechanism that is adjustable in height and position angle and is easy to install and remove. , devised a steel pipe fixing mechanism as shown in Figs. 1 to 3.

The structure will be explained in detail below based on the drawings. Figures 1 and 2 are cross-sectional views of the main parts of this embodiment, and 1.1' shows the mounting plate 13 for fixing the footboard etc., which is welded. The cylindrical steel pipe 2 is a cylindrical steel pipe whose outer diameter is the same as or slightly smaller than the inner diameter of the steel pipe, and there is a diameter larger than the wall thickness of the steel pipe 2 at least on the upper and lower two horizontal circumference lines. Through hole 3 having
, 4 are symmetrically drilled, and steel balls 5, 6 having a diameter slightly larger than the 3.degree. 4 diameter of the through holes are fitted.

Reference numeral 7.8 denotes a truncated conical holding member having tapered portions 7a and 8a on its outer periphery, and the members 7 and 8 are formed so as to maintain the following relationship.

(Minimum outer circumference diameter (1,) < (inner diameter of I pipe 1 - steel ball 5°6 diameter) <maximum outer diameter (12) < inner diameter of cylindrical steel pipe 2) Also, the retaining members 7 and 8 are each bolted on the axis. At the same time, drill bolt holes 7b and 7c for inserting the - fixing member 7.
On the back side, there is a circular upper recess 7 for making the nut 10 rotatable.
In the other holding member 8, a recess 8c having approximately the same diameter as the bolt 9 is formed in order to prevent the bolt 9 from spinning idly.

11 is a spring washer that connects the bolt 9 and nut 1.
0 makes it a tightening member 12.

To explain the fixing method with this configuration, first, the cylindrical steel pipe 2 is inserted into the steel pipe 1 to the extent that the upper through hole 3 is hidden, and then the holding member 8 is attached to the bolt 9 so that the tapered portion 8a faces upward.
This is inserted into a cylindrical steel pipe, and adjacent hard steel balls 5 at 5 b, 6 a are assembled.

The steel balls 5 and 6 slightly protruding from the inner surface of the steel pipe 2 are allowed to pass through the steel balls 5 and 6 while tilting diagonally using the gap between the 6 parts, and the holding member 8 is located below the lower steel ball 6.

In FIG. 1, a lid 14 is welded to the bottom of the cylindrical steel pipe 2 to prevent it from falling downward.

If the lid 13 is welded to the bottom of the cylindrical steel pipe 2 as shown in FIG. Hard steel balls 5 and 6 may be fitted into the through holes 3 and 4 from the outer periphery of the steel pipe 2 so as not to protrude from the outer circumferential surface of the steel pipe 2, and these may be fitted into the large diameter steel pipe.

In this case, by forming the hard steel balls 5, 6 to be slightly larger than the diameter of the through holes 3, 4, it is possible to prevent the hard steel balls 5, 6 from accidentally falling into the cylindrical steel pipe 2.

Next, insert another holding member 7 into the bolt 9 with the tapered part 7a facing downward, and after temporarily fixing it with a spring washer 10 and a nut 11, install the cylindrical steel pipe 2 by rotating or shifting it up and down. After setting the position of the plate 13 correctly, the nut 11 is screwed in.

When the nut 10 is screwed in, the retaining members 7 and 8 come close to each other, and the hard steel balls 5 and 6 that are in contact with the tapered portions 7a and 8a of the retaining members 7 and 8 are pushed outward and spread apart. As a result, the steel balls 5 and 6 press against and bite into the inner surface of the steel pipe 1, and since the steel balls 5 and 6 are tightly fitted into the through holes 3 and 4 of the cylindrical steel pipe 2, both the steel pipes 1 and 2 It is securely fixed without any looseness.

Incidentally, if it is desired to modify the height or position angle of the mounting plate 13, it is sufficient to loosen the nut 11 and repeat the same operation.

FIG. 3 shows an example of an application of the prior art, in which the above-mentioned embodiment is attached to both the upper and lower sides of a cylindrical steel pipe, and is used as a scaffolding support pillar at a construction site or as a six-pillar pillar for a spiral staircase.

To briefly explain the outline, 1, 1' and 2°2' are a steel pipe and a cylindrical steel pipe to which a mounting plate 13 for fixing a footboard (not shown) is welded to the side, respectively. 2' has a lid 14 welded to the bottom, and two rows of through holes 3, 4.3' on both upper and lower sides.

4' is formed.

In order to fix the cylindrical steel pipe 2' and the steel pipe 1, first, the steel balls 5 and 6 are passed through the bolt 9 with the retaining member 8 installed inside the small steel pipe 2' while tilting the bolt 9. Insert another fixing member 7 into the bolt 9 and temporarily secure it with a nut 10, etc. Next, insert the steel pipe 1, adjust the height and position angle, and then tighten the axial length ratchet from above the steel pipe 11. Tighten and secure the nut 10 with a wrench or the like.

Next, when fixing steel pipe 1 and cylindrical steel pipe 2, cylindrical steel pipe 2
After first inserting the bolt 9 with the retaining member 8 installed therein, the through hole 3' is inserted from the outer periphery of the steel pipe 2.

After fitting the hard steel balls 5' and 6' into the steel pipe 4', inserting the retaining member 7 from above and temporarily fixing it with a nut 10, etc., insert the steel pipe 2 into the steel pipe 1. After adjusting the height and position angle, the nut 10 is similarly tightened and fixed from above the cylindrical steel pipe 2 using a long axial ratchet wrench or the like.

From here on, you can repeat this step by step.

However, in this conventional example, the diameter of the hard steel balls 5 and 6 is made slightly larger than the diameter of the through hole 3.4, and the steel balls 5 and 6 are Although this is intended to prevent the steel balls 5 and 6 from falling to the holding member 7, it is not perfect, and the steel balls 5 and 6 may be accidentally
, 8. If it is driven deeper than the minimum diameter 11 of the tapered surface, it is difficult to return it, and the fixing work is extremely troublesome.

Technical Means for Solving Problem 1 In order to solve the drawbacks of the prior art, the present invention uses a soft thin film body formed such that its edge is fixed on the outer peripheral surface of the cylindrical steel pipe 2. The point is that a steel ball, that is, a fixed body is fitted into the through hole.

According to this technical means, the fixed body is inserted into the through hole through the soft thin film body formed so that the edge thereof is fixed on the outer peripheral surface of the cylindrical steel pipe 2. , fixed body 16
This eliminates the risk of the material falling onto the outer periphery of the cylindrical steel pipe.

In addition, since the thin film body is soft, when fixing steel pipes together,
The thin film body sandwiched between the holding member and the fixed body is crushed or torn open by the pressing force between them, and does not pose any obstacle during fixation.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 4 is a sectional view of a main part showing this embodiment, in which a fixed body 16 is fitted into a through hole 4 of a cylindrical steel pipe 2 with a soft thin film body 15 interposed therebetween.

The soft thin film body 15 has a recess 15a in the center and a flange 15b around the periphery.
, and is formed so as to be fixable to the outer peripheral surface of the cylindrical steel pipe 2.

Further, the material of the soft thin film body 15 is preferably softer than that of the holding member 8, and for example, aluminum, organic resin, etc. are preferable.

The fixed body 16 fitted into the recess 15a of the soft thin film body 15 differs from the previous embodiment in that it has a protrusion shape on one side and a hemispherical shape on the other side in order to improve its penetration into the inner surface of the steel pipe to be fixed. However, in any case, the fixed body 16 must have a length 13 larger than the cylindrical steel pipe 2.

To explain the effect of this configuration, by tightening the clamping member 12 inserted through the retaining member 8, the retaining member 8 comes into contact with the fixed member 16, and the fixed member 16 is removed while deforming the thin film body 15. It spreads in the opposite direction, presses against the steel pipe 1, and bites into it.

At this time, the thin film body 1 sandwiched between the holding member 8 and the fixed body 16
5 is crushed or ruptured by the pressing force between the two, and does not pose any obstacle during fixation.

The thin film body 15 may be formed to cover the entirety of the adhesive body 16 in order to prevent the adhesive body 16 from falling onto the outer periphery of the cylindrical steel pipe.

FIG. 5 is a cross-sectional view of a main part showing another embodiment in which steel balls are used as the fixing body in the same way as in the prior art. A hard steel ball 51 is fitted into the hole 4 with a soft thin film body 52 interposed therebetween.

The soft thin film body 52 has a flange 15b around the central recess into which the steel ball 51 is fitted, as in the above embodiment.
b is formed so as to be fixable to the outer peripheral surface of the cylindrical steel pipe 2.

According to this embodiment, by using the steel ball 51 as the fixed body, even if the fixed body rotates or angularly shifts within the through hole 4, the length of the fixed body 13 does not change and can be reliably fixed. .

1. As described above, according to the present invention, it is possible to completely prevent a steel ball or other fixed object from falling into the cylindrical steel pipe member 2, and also to prevent the fixed object from accidentally falling into the minimum diameter of the tapered surface of the holding member. 1
Even if it is driven in deeper than 1, it is possible to pull it outward by holding the soft thin film body and easily return it to its original position, which has the remarkable effect of making the fixing work extremely easy.

[Brief explanation of drawings]

1 and 2 show a steel pipe fixing mechanism according to the prior art, in which FIG. 1 is a longitudinal sectional view and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. FIG. 3 is an overall perspective view showing an example of its application. FIGS. 4 and 5 are sectional views of essential parts showing embodiments of the present invention, respectively. 2... Cylindrical steel pipe, 3, 4... Through hole,
5,16.16.51...Fixed body, 7,8...
...Retaining member, 12...Tightening member (9...
...Bolt, 10...Natsuto), 15,5
2... Soft thin film body, 15b. 52b... Edge.

Claims (1)

[Scope of Claim for Utility Model Registration] A steel pipe member having through holes drilled symmetrically on the upper and lower horizontal circumference lines of a cylindrical steel pipe whose outer diameter is the same as or slightly smaller than the inner diameter of the steel pipe to be fixed; A fixed body fitted into a through hole of a steel pipe member through a soft thin film body having a length greater than the wall thickness of the steel pipe member and whose edge is fixed to the outer circumferential surface of the steel pipe member. and a pair of truncated conical holding members and a tightening member having the following relationship: minimum outer diameter (inner diameter of steel pipe to be fixed - fixed body length) maximum outer diameter (inner diameter of steel pipe member); The member is fitted into a steel pipe for fixing the member, and the pair of truncated conical retaining members are disposed vertically opposite each other within the steel pipe member, and the retaining members are penetrated on the axis of both retaining members. A steel pipe fixing mechanism that fixes the steel pipe member and the steel pipe by bringing them close to each other and restraining them via a tightening member.