JPH0932811A - Steel pipe clamp for temporary installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe clamp for temporary installation which can prevent deformation due to buckling from occurring at a nut tightened part even at the time of excessive nut tightening operation for its use. SOLUTION: In this steel pipe clamp A, a cover 3 is rotatably-pivoted, with a shaft 4, to the top end of the vertical part of the body 2 of a clamp whose front is of L shape and which has a steel pipe engagement recessed part 1 for bringing the steel pipe to be engaged into contact by a roughly half lap inside it, and a tightening bolt 6 is pivoted to the end of a horizontal part so as to rotate with a pivoted shaft 5. The top end of the cover 3 is made thinner than the width of the main part of the cover, and a nut tightening part 8 provided with a bolt inserting lock groove which is formed at its end and cut in the longitudinal direction of the cover 3 is covered and fitted. By a groove fitted part of such a width as to be fitted in the bolt inserting lock groove. An enclosure washer 10 provided with a bolt hole for inserting the bolt 6 in the central plane part is also formed as a raw material by press working.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe clamp for temporary installation in which a packing washer is interposed between a lower surface of a nut screwed to a tightening bolt pivotally attached to a main body and an upper surface of a nut tightening portion of a lid. It relates to a steel pipe clamp.

[0002]

2. Description of the Related Art In a temporary steel pipe clamp, at the time of the appearance of the clamp, a general-purpose flat round washer was mounted between the lower surface of a nut screwed to a tightening bolt pivotally attached to a main body and the upper surface of a nut tightening portion of a lid. However, due to the low workability, the nut side has been improved, and the washer that was a separate member has been eliminated by the appearance of the flange nut that integrates the flat round washer action. It is still used until now.

[0003]

In order to simply verify the difference between the mounting and non-mounting of the washer, it has been found that the one with the washer is slightly advantageous over the one without the washer in the tightening effect. Although there is no difference that affects the tightening ability as a clamp, considering the unpopularity of the workability of the workers who actually participate in the clamp tightening work, the problem is that even the non-wearing type affects the posture. Most of the current clamps are used in the non-attached form of the washer.

As described above, no particular problem has been raised so far as to present whether or not the washer is present as a problem.

On the other hand, in terms of safety, the steel pipe clamp for temporary scaffolding, that is, the so-called clamp (hereinafter simply referred to as "clamp") is repeatedly used, and the rigidity is deteriorated.

It is impossible to judge the number of times of repeated use of the clamp only by visual inspection.
It is indistinguishable unless there is trauma. Therefore, the direction in which most of the clamp lid body is unusable due to buckling of the bolt insertion / removal locking groove portion, or the one in which the tightening bolt cannot be inserted / removed from the lid body, is discarded.

[0007] The cause of this deterioration degree progressing phenomenon may be due to the withstanding pressure supporting action during use, but this is a very small amount. Rather, clamps other than new ones are shipped once, and the equipment is used again after being used. It is called "maintenance" for entering the center and re-exiting, and in particular, oil is applied to the bolt and nut parts with a brush. Therefore, even if the worker tightens with the same degree of tightening as a new tightening, the frictional resistance decreases, so that the tightening torque becomes too high, which makes it unusable and accelerates the deterioration rate.

Most of the workers do not like to tighten the nuts, which are screwed into the bolts more than necessary, in order to secure a high degree of safety during the tightening work.

As a result, the portion that receives the most compression action is at the nut tightening portion on the lid side, and the buckling phenomenon occurs due to over-tightening.

Since the nut tightening portion is divided into two parts, either the phenomenon in which the nut on the upper side expands in the left-right direction due to the downward tightening action, or the approach to the central portion is made. The buckling action works.

At the beginning of the buckling phenomenon, even if the buckling phenomenon is mild enough to be invisible, once it deviates from the normal shape, the bearing support force is lost immediately, and the deformation is suddenly promoted by the subsequent pressure reception. Possesses characteristics.

The deformed state of the nut tightening portion due to the above-mentioned buckling phenomenon is divided into a state in which the nut is tightened outward and a state in which the buckling of the inner side buckles makes it difficult to remove the bolt. This is presumed to be a phenomenon for applying oil to bolts and nuts for use.

When the nut tightening portion is thus deformed by the buckling phenomenon, the ability to tighten the steel pipe is lost and the purpose of use as a clamp cannot be achieved.

The technique of the present invention has been developed in order to prevent buckling deformation of the nut tightening portion due to excessive tightening of the nut tightening portion in the lid body.

Therefore, as described above, an object of the present invention is to provide a temporary steel pipe clamp which does not cause a deformation phenomenon in the nut tightening portion even when there is an excessive nut tightening action when the steel pipe clamp is used. .

[0016]

The first aspect of the present invention is a means for achieving the above object. According to the first aspect of the present invention, a steel pipe engaging recess capable of abutting about a half circumference of a steel pipe to be engaged is formed. Steel pipe clamp in which a lid is pivotally attached to the upper end of the vertical portion of the front L-shaped clamp that is pivotally attached to the side of the clamp, and a fastening bolt is pivotally attached to the tip of the horizontal portion. In, the tip of the lid is made narrower than the width of the main portion of the lid, and the nut tightening portion having an opening groove at the tip and having a bolt insertion / removal locking groove cut in the longitudinal direction of the lid is covered. Fitting, and while forming a packing washer having a bolt hole through which the bolt can be inserted and penetrated in the center of the plane by press working using a steel plate as a material, the packing washer is inserted and engaged with the bolt, In addition, tighten the nuts to the bolts to tighten the bolts of the steel pipe clamp. The door and wrapped seated gold is made by assembling together.

According to a second aspect of the present invention, there is provided a groove fitting portion having a width that can be inserted inward from the center of the front surface of the packing washer into the bolt insertion / removal locking groove of the nut tightening portion of the lid. It will be.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, as described above, a nut-shaped nut tightening portion 8 formed in a projecting manner, which is formed so as to be narrower than the width of the lid body from the central portion of the lid body in the steel pipe clamp, is formed. The nut tightening portion 8 is covered and engaged with the tightening bolt 6 inserted into and engaged with the bolt insertion / removal locking groove 7 of the portion 8 from the upper surface direction of the nut tightening portion 8 with the washer 10 and the nut 11 is tightened. This is intended to prevent deformation of the nut tightening portion 8 due to buckling.

That is, a lid 3 is attached by a shaft 4 to the upper end of a vertical portion of a main body 2 of a front L-shaped clamp having a steel pipe engaging recess 1 on the inner corner side capable of abutting about a half circumference of a steel pipe to be engaged. In the steel pipe clamp A, which is rotatably pivotally attached, and the tightening bolt 6 is pivotally attached to the end of the horizontal portion by the pivot 5, the tip of the lid 3 is wider than the width of the lid main portion. Thin,
Moreover, the nut tightening portion 8 having the bolt insertion / removal locking groove 7 which has a groove at the tip and is cut in the longitudinal direction of the lid body 3 can be covered and fitted, and the bolt 6 can be inserted and penetrated in the central portion of the plane. A packing washer 10 having a bolt hole 9 is formed by pressing a steel plate as a raw material, and the packing washer 1
0 is inserted and engaged with the bolt 6, and a nut 11 is post-tightened to the bolt 6 to integrally assemble the bolt 6 of the steel pipe crumb A and the packaging washer 10.

Further, the left and right nut tightening portions 8 formed through the bolt insertion / removal locking grooves 7 are directed inward from the central portion of the front surface of the packing washer 10 in order to prevent the central portion from approaching due to a buckling phenomenon. The groove fitting portion 12 having a width that can be inserted into the bolt insertion / removal locking groove 7 in the nut tightening portion 8 of the lid 3 is provided in a protruding manner.

Since the nut tightening portions 8 projecting from the tip end portion of the lid 3 project in parallel through the bolt insertion / removal locking grooves 7 as described above, individual nut tightening due to excessive pressure is a structural weak point. The attachment parts 8 and 8 include elements that twist in the left-right direction (inward / outward direction) from the root part, apply oil, and exceed the limit of the appropriate pressing force support range by excessive pressure more than necessary. The buckling phenomenon occurs all at once, and the nut tightening portions 8, 8 formed in two mats are bent or deformed by buckling inward or outward, or irregularity in which one is outside and the other is inside. It may cause buckling.

Therefore, the present invention is to cover the surface of the nut tightening portion 8 having a regular shape with the wrapping washer 10.

A washer 10 made of a steel plate
The shape of is a substantially three-dimensional shape excluding the rear standing wall and the bottom surface so that the nut tightening portion 8 is closely packed on the back side, and the outer shape of the nut tightening portion 8 is an inner surface shape that can be inserted and fitted. Further, the front walls 10b, 10c, 10d and the upper plate 10a form a substantially cubic body excluding the rear wall and the bottom plate.
A hole 9 for a bolt is formed in the center of the elongated hole in the longitudinal direction.

The packing washer 10 thus constructed is inserted into the bolt hole 9 and the tightening bolt 6 of the steel pipe clamp A is inserted and engaged from the back side thereof.
The nut 11 is screwed into the fastening washer 10 so that the engagement washer 10 previously engaged with the distal end of the
Keep 0 and 1 together.

The steel pipe is engaged with the steel pipe engaging recess 1 of the main body 2 of the steel pipe clamp A, and the lid 3 is rotated to join the back surface to the outer periphery of the steel pipe.

On the other hand, the packing washer 10 pivotally attached to the tip of the main body 2 and the tightening bolt 6 to which the nut 11 is engaged are tilted outward, and the packing washer 10 is Hold both sides of each of the two with two fingers and pull up so as to join to the lower surface of the nut 11 screwed to the tip side, and when the steel pipe and the steel pipe clamp A are in the mounting posture, the tightening is carried forward. The bolt 6 is activated and inserted into the bolt insertion / removal locking groove 7 in the nut tightening portion 8 at the tip of the lid 3 until the rotation operation is stopped.

Then, by pulling down the packaging washer 10 later, the recesses on the back surface of the packaging washer 10 are fitted so as to cover the nut tightening portion 8, and the packaging washer 10 and the nut are tightened. When the nut 11 is tightened with the required torque after the unit 8 and the nut 8 are united, the packing washer 10 is attached to the lower surface of the nut 11.
Press and rotate the upper surface of and press down.

At this time, if the packaging washer 10 has a mismatched portion due to the engagement with the nut tightening portion 8 engaged with the lower surface,
In order to match and correct this, the upper plate 10a is moved within the range of the elongated bolt hole 9 formed in the upper plate 10a and brought into close contact therewith.

If the nut 11 is still tightened in this manner, the lower surface of the nut 11 and the upper plate 10 of the packaging washer 10 are also tightened.
a, the inner surface of the packing washer 10 and the outer surface of the nut tightening portion 8 are in close contact with each other, and further, due to the tightening action of the nut 11, both of them via the bolt insertion / removal locking groove 7 in the nut tightening portion 8 are, for example, outwards. Included washer 1
It is rejected by the inner surface of 0, buckling deformation is not allowed, and therefore the nut tightening portion 8 is pushed down without deformation, whereby the steel pipe sandwiched between the nut tightening portion 8 and the lid body 3 of the steel pipe clamp A. The main body 1 is pressed against the main body 1 and firmly tightened.

Further, the front wall 10 of the packing washer 10 is
d In the case where the groove fitting portion 12 is provided at the vertical center of the back surface, the lower surface of the nut 11 presses the upper plate 10a of the packaging washer 10 by occupying the nut 11 in the same manner as described above. , The inside of the left standing wall 10b and the right standing wall 10c of the packing washer 10 to be pressed is regulated so as to maintain a regular one on both sides of the nut tightening portion 8, and further, in the central portion of the front standing wall 10d, A groove fitting portion 12 having a width that allows the front wall 10d to be further retracted to the inner side of the inner surface and has a width that can be fitted into the bolt insertion / removal locking groove 7 is inserted into the bolt insertion / removal locking groove 7 from above. Bolt insertion / removal locking groove 7
Since it is configured to intervene as a gap member of the nut 11, excessive tightening of the nut 11 prevents mutual action of the nut tightening portions 8 located on both sides due to a buckling phenomenon, and the width dimension defined by the bolt insertion / removal locking groove 7 is defined. To keep the tightening bolt 6 in and out, and
The original shape of the nut tightening portion 8 is maintained.

These are nuts because the packaging washer 10 is a single press product in which each standing wall, that is, the left standing wall 10b, the right standing wall 10c, and the front standing wall 10d are connected in series, and the upper part thereof is connected to the upper plate 10a. Even if the expansion action of the tightening 8 is generated, the action of suppressing the expansion action works to prevent the deformation due to the buckling phenomenon.

[0032]

As described above, according to the present invention, the inclusion washer capable of covering the surface of the nut tightening portion of the lid in the steel pipe clamp is interposed between the nut washer and the lower surface of the tightening bolt, so that the washer is simply used as a washer. In addition to the effect as a “washer”, the buckling deformation of the nut tightening part due to excessive tightening operation of the nut is prevented, so that the life of the nut tightening part that occupies the highest degree of deterioration due to repeated use compared to the past can be improved. It has the effect of being able to prolong the life far, increasing the number of times of repeated use, and enabling long-term use with peace of mind.

[Brief description of drawings]

FIG. 1 is a front view of a steel pipe clamp equipped with a packing washer.

FIG. 2 is a plan view of the lid body.

FIG. 3 is an enlarged perspective view of a packaging washer.

FIG. 4 is an enlarged cross-sectional view taken along the line CC of FIG.

FIG. 5 is an enlarged perspective view of a packaging washer showing another embodiment.

6 is a reduced cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

 1 Steel Pipe Engagement Recess 2 Body 3 Lid 4 Shaft 5 Axis 6 Tightening Bolt 7 Bolt In / Out Locking Groove 8 Nut Tightening Section 9 Bolt Hole 10 Bolt Washer 10a Upper Plate 10b Left Standing Wall 10c Right Standing Wall 10d Front Standing Wall 11 Nut 12 Groove fitting part A Steel pipe clamp

Claims (2)

[Claims] 1. A lid body 3 is attached by a shaft 4 to a vertical upper end of a body 2 of a front L-shaped clamp having a steel pipe engaging recess 1 capable of abutting about a half circumference of a steel pipe to be engaged on an inner corner side. In the steel pipe clamp A, which is rotatably pivotally attached, and the tightening bolt 6 is pivotally attached to the end of the horizontal portion by the pivot 5, the tip of the lid 3 is wider than the width of the lid main portion. It is possible to cover and fit a nut tightening portion 8 that is thin and has a bolt insertion / removal locking groove 7 that is grooved at the tip and cut in the longitudinal direction of the lid body 3,
Also, a packaging washer 10 having a bolt hole 9 through which the bolt 6 can be inserted and penetrated is formed in the center of the plane by press working using a steel plate, and the packaging washer 10 is inserted and engaged with the bolt 6. , And the nut 6 on the bolt 6
After tightening, tighten the bolt 6 and the washer 10 of the steel pipe clamp A.
A steel pipe clamp for temporary construction, characterized by being integrally assembled with and. 2. A groove fitting portion 12 having a width such that it can be inserted inward from the central portion of the front surface of the packaging washer 10 toward the inside of the bolt tightening / removing locking groove 7 of the nut tightening portion 8 of the lid body 3. The steel pipe clamp for temporary construction according to claim 1, characterized in that.