JP3004986U - Tightening member structure in steel pipe clamp - Google Patents

Abstract

(57) [Summary] [Purpose] A bolt / nut used for tightening and loosening work by utilizing the locking phenomenon that occurs when the tightening force for the locking part of the lid is large in the tightening tool for the steel pipe clamp. On the other hand, the purpose is to increase the screw pitch to reduce the required number of turns, improve the workability of attaching and detaching the steel pipe, and improve the efficiency of the work of peeling the deposits from the thread troughs. Is. [Constitution] Pivotally attached to one end of the clamp body 1,
In the bolt 4 that engages with the locking groove 2b that is opened in the locking portion 2a of the lid body 2 that is pivotally attached to the clamp body 1, the pitch P of the thread A in the bolt 4 is increased, and The maximum inclination angle is 45 degrees as an upper limit from the position orthogonal to the axis of the bolt 4, and the overall length of the unit thread of the screw portion is shortened to form the nut 5 which can be screwed into the screw of the bolt 4. A tightening member structure in a steel pipe clamp, characterized by being combined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a tightening member in a steel pipe clamp, that is, a bolt / nut.

[0002]

[Prior art]

 The screw configuration of the tightening bolt in the steel pipe clamp is in accordance with the JIS standard according to the diameter of the bolt.

[0003]

[Problems to be solved by the device]

 In a steel pipe clamp, the lid that is pivotally attached to the clamp body is opened and closed each time the steel pipe is attached and detached.To open and close this lid, use the bolt that is pivotally attached to the clamp body side. It is carried out in a locking groove on the side of the lid body by rotating, and the nuts screwed into the bolts are tightened and loosened.

In both the opening and closing operations of the lid, the nut has a large screwing depth with respect to the bolt, and therefore requires a large number of rotation operations, and the number of clamps used at one construction site is enormous. Since the number of times the nut is screwed is large or small for each of the large quantities, its workability is so powerful that it affects the length of the construction period.

From the era of appearance of the steel pipe clamps, the parties who directly attach and detach the steel pipe clamps demand the reduction of the number of rotations of the nuts, and they are the first complaints and requests. However, for the sake of safety first, the clamp industry and the governmental office believe that the conventional structure is the only best technology for the improvement of these tightening members. There is no room for this, and on the other hand, there is no attempt to look at technological improvements with the safety as a shield, and therefore, the matters related to these reforms were prohibited.

However, in the process of developing the clamp in parts other than the above-mentioned tightening member, the fact that had never been taken into consideration until now was accidentally rediscovered.

[0007] The fact is that, in the lid body that abuts and presses about one-third or more of the outer circumference of the steel pipe that is the adherend, the nut abutment portion at the free end of the lid body Even if the arc surface on the inside of the lid comes into contact with the outer circumference of the steel pipe, the nut is tightened so that the locking groove that locks the bolt from the working end of the lid is opened by the tightening action of the nut. The point is that the part bends against the elasticity it possesses by crimping the nut.

“Bending”, that is, a repulsive force against the pressure contact surface of the nut during tightening, which acts as a loosening prevention action on the nut.

The above-mentioned anti-loosening action rises in proportion to the tightening operation of the nut, and the tightening degree between the lid and the steel pipe is increased even if an unnecessarily unnecessary turning operation is performed for the purpose of enhancing the safety factor. When the upper limit of the pressure contact is reached, the tightening effect does not increase even if the tightening is further tightened, and only the above-mentioned anti-loosening effect increases, but this is a case in which the bolt is disconnected due to the excessive tightening strength. . It is a situation in which the worker seeks to improve safety and efficiency, and as a result is not in a favorable state, there is a point to respect the worker's feelings for safety.

As described above, focusing on the situation where excessive locking of the nut causes the locking portion to stop loosening, and even if the screw pitch of the bolt / nut is increased, that is, the inclination angle of the screw is increased, This led to the discovery of the fact that the nut after tightening did not cause a slackening phenomenon.

Generally, in bolts and nuts intended for tightening, the slackening phenomenon increases in proportion to an increase in the pitch of the screw, that is, an increase in the inclination angle, so that a strong tightening force is retained, and In order to prevent the slackening phenomenon, a large meshing force can be obtained by lowering the inclination angle of the screw, and it is calculated based on the calculation method that was established when obtaining the tightening force to be set. However, when it is intended to increase the tightening force, a large number of rotations is often required for the nut.

[0012] The present invention utilizes, in a tightening tool for a clamp for a steel pipe, a loosening prevention phenomenon that occurs when a tightening force with respect to a locking portion of a lid body is large, and a bolt and nut used for tightening and loosening work. On the other hand, the purpose is to increase the screw pitch to reduce the required number of rotations, improve the workability of attaching and detaching the steel pipe, and improve the work of removing the deposits from the thread troughs. Is.

[0013]

[Means for Solving the Problems]

 This invention is, as means for achieving the above object, the first invention, which is pivotally rotatably attached to one end of the clamp body, and is provided with a groove in the engaging portion of the lid pivotally attached to the clamp body. In the bolt to be engaged with the locking groove, the pitch of the thread on the bolt is increased, and the inclination angle of the thread is 45 degrees from the position orthogonal to the axis of the bolt. The unit thread is formed by shortening the overall length and is combined with a nut that can be screwed into the screw of the bolt.

A second invention is a bolt which is rotatably pivotally attached to one end of a clamp body and which is engaged with an engagement groove opened in an engagement portion of a lid body pivotally attached to the clamp body. In addition to increasing the pitch of the thread in the screw, the maximum angle of inclination of the thread is 45 degrees from the position directly intersecting the axis of the bolt, and the total length of the unit thread of the thread is shortened. , An auxiliary screw thread having the same pitch as the pitch is provided between the screw threads in the large pitch gap, and one bolt is formed by a plurality of screw threads and auxiliary screw threads. The bolt and the nut that can be screwed into the screw of the bolt are combined.

A third invention is a bolt, which is pivotally rotatably attached to one end of a clamp body and is engaged with an engagement groove opened in an engagement portion of a lid body pivotally attached to the clamp body. In addition to increasing the pitch of the threads in the screw and eliminating the corners of the bottom of the thread trough, the cross-section has a substantially U-shape to provide a thread trough, and the inclination angle of the thread is the maximum inclination from the position orthogonal to the axis of the bolt. The upper limit of the angle is 45 degrees, and the overall length of the unit thread of the threaded portion is shortened, and at the same time, a nut that can be screwed into the thread of the bolt is combined.

A fourth invention is a bolt, which is pivotally rotatably attached to one end of a clamp main body and is engaged with an engaging groove opened in an engaging portion of a lid pivotally attached to the clamp main body. In addition to increasing the pitch of the threads in the screw and eliminating the corners of the bottom of the thread troughs, the cross-section has a substantially U shape to provide thread troughs, and the inclination angle of the thread is the maximum inclination from the position orthogonal to the axis of the bolt. With the angle of 45 degrees as the upper limit, the total length of the unit thread of the screw part is shortened, and the auxiliary thread with the same pitch as the pitch is formed in the gap of the large pitch described above. Providing a screw trough that is almost the same shape as the screw trough, one bolt is formed by multiple screw threads and auxiliary screws, and such a bolt is combined with a nut that can be screwed into the screw of the bolt. It will be.

[0017]

[Action]

 A clamp consisting of a lid body pivotally supported at the upper end of the vertical part of a substantially L-shaped clamp body that can engage an approximately half outer circumference of a steel pipe with a concave arc on the inner circumference, and a bolt pivotally supported at the tip position of the horizontal part. , The bolt is engaged with the bolt engaging groove that is open at the front end of the locking portion provided at the tip of the lid, and the nut is screwed onto the threaded portion of the bolt protruding from the locking portion. In this case, the nut is tightened by a rotating operation, but these operations are the same as the tightening operation in the conventional publicly known steel pipe clamps in general.

According to the present invention, since the thread pitch of the bolt is larger than the thread pitch of the conventional bolt for general steel pipe clamps, the screwing distance to be screwed into the bolt is the same. Under the precondition that the bolts are engraved on the bolt, the inclination angle of the screw is increased by increasing the pitch of the screw engraved on the bolt. In the section, the number of rotations of the nut is inversely proportional to the increase of the pitch, and the number of rotations is small.

In this way, the steel pipe is engaged with the clamp body, and the lid body pivotally attached to one end of the clamp body is rotated to bring it into contact with the exposed outer peripheral portion of the steel pipe. By increasing the screw pitch pivotally attached to the other end of the clamp body with respect to the locking groove at the tip, a bolt with a large screw inclination angle is inevitably rotated and engaged, and the tip position of the bolt By screwing the nut that was screwed onto the screw in the tightening direction, the lower surface of the nut is attached to the lid with the rotation speed much lower than the tightening rotation speed of the bolt and nut in the conventional steel pipe clamp. By abutting against the stopper and still rotating, the lid body presses the steel pipe and the reaction force receiving action of the clamp body causes the steel pipe to be crimped to the clamp body.

By continuing the tightening action of the nut, in the pressing action of the lid against the steel pipe, the lid and the lid are resistant against the elasticity inherent to the lid against the nut tightening turning operation after the time when the limit is exceeded. With the base position of the locking portion at the tip as a force point, only the locking portion turns for bending motion, and this starts the loosening prevention action.

The repulsive force that causes the locking portion to return to the original position serves as a slack preventive action, which allows the repulsive force of the locking portion to loosen the nut even when the tightening turning force for the nut is terminated. It lasts until the action is given.

On the other hand, when the pitch of the screws is made large and the individual cross-sectional shapes of the screw threads are made into a mountain shape or a shape conforming to the mountain shape, the width of the thread valley is increased, and the cross-sectional shape is open and has a substantially U shape. Or, it becomes a shallow plate shape, so that even if the mortarized component of the concrete to be cast is dropped or paint is dropped onto the bolt during use as a clamp, the screw trough can be easily peeled off with a sharp-edged instrument. It is possible.

[0023]

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. The steel pipe clamp body itself is publicly known. That is, one end of the arc-shaped lid body 2 matched with the curvature of the outer circumference of the steel pipe (not shown) to be engaged with the upper end of the vertical portion 1a of the substantially L-shaped front clamp body 1 is pivoted by the pivot shaft 3. The horizontal portion 1b is pivotally attached freely, and at the tip of the horizontal portion 1b, a base end of a bolt 4 into which a nut 5 is screwed is rotatably attached by a shaft 6, and further, the vertical portion 1a and the horizontal portion 1b are attached. Is formed by an arc locking side 1c having a curvature according to the outer diameter of the steel pipe, and the arc locking side 1c can be engaged with about a half circumference of the outer circumference of the steel pipe to be engaged. The inner circular arc surface of the lid 2 is designed to be able to come into contact with about one third of the outer circumference of the steel pipe, and the lid 2 has an end portion on the side opposite to the pivot portion, The locking portion 2a is provided so as to project from the center portion in the width direction, and the lid body is provided from the tip of the locking portion 2a. Longitudinal engaging the bolt 4 towards Rukakaritomemizo 2b are open grooves.

The steel pipe clamp body configured as described above is publicly known as described above.

The present invention relates to an improvement of the tightening member, that is, the bolt 4 and the nut 5, for crimping the clamp body 1 and the lid body 2 pivotally attached to the clamp body 1 in the publicly known publicly-used steel pipe clamp body. Relates to the screw portion of the bolt 4 and the nut 5.

Except for special ones, the engraved form of screws in general-purpose bolts and nuts generally has screw threads configured in accordance with the JIS standard in accordance with the bolt diameter, and the publicly known steel pipe clamp described above. The screw parts of the bolts and nuts in the body also have a screw structure according to the JIS standard.

The gist of the present invention is to increase the pitch P of the threads A of the bolts 4 mounted on the steel pipe clamp body to be larger than the pitch of the threads of the bolts of the conventional steel pipe clamp body. In contrast to the several examples of the embodiments, all of the female screw configurations of the nut 5 screwed to the bolt 4 can be screwed to the screw thread A of the bolt 4 and can exert the original action and effect of the nut. Of course, the nut 5 of the present invention does not have a structure expecting an action and an effect other than the "nut", so that the nut 5 of the present invention can be used for all the bolts 4 of the present invention. Since the following screwing and screwing are possible, the configuration of the nut 5 itself is omitted.

By increasing the pitch P of the thread A of the bolt 4 in the steel pipe clamp body of the present invention, the range of increase in the inclination angle of the screw is the bolt according to the JIS standard of the conventional clamp body. The minimum pitch of the screw threads is set to 45 degrees, and the maximum inclination angle of the screw with the increase of the pitch P is set to 45 degrees.

In a screw, the screw is a single thread, and the length of the length of expansion of the thread determines the engagement screwing distance of the nut that engages with the thread. Therefore, by shortening one screw, that is, by increasing the pitch P of the screw, the entire length of the screw is necessarily shortened and the inclination angle of the screw is increased.

As means for increasing the pitch P between the screws, there are a plurality of embodiments and embodiments which will be described in detail below. Basically, by forming the screw thread A into an inverted V shape having a substantially mountain-shaped cross section or a shape similar to an inverted V shape, the screw valley B becomes a wide recess, and this recess shape is an open U-shape. Or it becomes a shallow dish. (See FIGS. 1, 3, and 4.)

By increasing the pitch P of the screws in this way, when the screw thread A has an inverted V-shaped cross section, the screw valley B corresponding to this has a concave trapezoid parallel to the axis of the bolt 4. (Refer to FIG. 4) and, conversely, when the thread trough B has a V-shaped or U-shaped longitudinal cross-section, the top of the screw thread A is parallel to the axis of the bolt 4 (see FIG. 5). ), Or a wavy shape having a top on a line parallel to the axis of the bolt 4 or a small continuous crest, and the thread A and the thread trough B may be formed with almost the same width. As a means for constructing such a shape, it can be formed by pressure motion other than cutting. Furthermore, except for the thread A and the thread trough B other than the inverted V-shape, its longitudinal sectional shape is Irregular shape of prism The shape may be continuously formed. (Refer to FIG. 6) Furthermore, it is optional to form the screw thread A in an inverted U shape and further to form a screw trough in a U-shaped groove (see FIG. 7). And various shapes of thread trough B shape may be arbitrarily combined.

Furthermore, as another embodiment, as described above, one screw thread A is threaded with a wide pitch P, and the pitch P 1 is the same as the pitch P between the pitches P. A plurality of screw threads are formed by providing screw threads, and these screw threads A and auxiliary screw threads A1 are engraved at the same pitch (see FIGS. 9, 10 and 11), and It is also optional to adopt any shape and shape of the thread trough B and combine them.

Furthermore, it is also optional to engrave a plurality of screw threads A1 and A2 between the pitches P1 of the screw threads A, and the individual heights of the screw threads A1 and A2 are the same as those of the bolt 4 as described above. In some cases, the thread size may be the same as the JIS standard according to the diameter, and the thread shape may be an inverted V shape. Also, when using a plurality of screw threads A and auxiliary screw threads A1 and A2, Regarding the shape of the thread A, it is optional to mix the above-mentioned shapes and their large and small sizes.

As described above, the inclination angle of the thread A of the bolt 4 used for the steel pipe clamp body is set to the same angle as the inclination angle of the thread of the tightening bolt in the conventionally publicly known steel pipe clamp, and The technical constitutional requirement of the present invention is that by increasing the angle within the range of the maximum angle of 45 degrees, that is, by increasing the pitch P of the conventional screw threads, the inclination angle is inevitably increased. Thus, by increasing the inclination angle of the screw thread A within a certain set length of the screw section in the bolt 4, one thread engraved on the outer circumference of the bolt 4 is formed. The developed length of the screw thread is shorter for the screw thread A having a lower inclination angle. Therefore, the nut 5 screwed to the bolt 4 can obtain a large screwing distance by a small number of spirals. Is something that can be done.

By increasing the pitch P of the screw threads A in this way, the increase in the inclination angle of the screw threads A is as described above. Due to the widening of the clamp, it is possible to easily remove the mortar content of cement, or the phenomenon of adhesion to the bolt due to dripping of paint, glue, etc., with the aid of a sharp tip when using the clamp. It is possible that the clamp can be reused.

[0036]

[Effect of device]

 Since the present invention is configured as described above, the nut engaged with the bolt is screwed each time the steel pipe is attached or detached.However, the pitch of the threaded portion of the bolt is increased, that is, the inclination angle is increased. As a result, the number of rotations of the screwed nut can be reduced, and the workability when using or removing the steel pipe clamp can be greatly improved.

Furthermore, by widening the thread root width dimension with the increase in the pitch of the threaded portion of the bolt, the adhesion action of solid matter such as mortar of concrete, paint, and paste is reduced, and In case of adherence, it is effective to facilitate the peeling work.

[0038]

[Brief description of drawings]

Fig. 1 Front view of steel pipe clamp Fig. 2 Plan view of lid Fig. 3 Enlarged front view of bolts and nuts of the present invention mounted on steel pipe clamp Fig. 4 Enlarged front view of bolts and nuts with different thread shapes 5 is an enlarged front view of a bolt of another embodiment. FIG. 6 is an enlarged front view of a bolt of still another embodiment. FIG. 7 is an enlarged front view of a bolt of yet another embodiment. Enlarged front view FIG. 9 Enlarged front view of a bolt of another embodiment FIG. 10 Enlarged front view of a bolt of another embodiment of FIG. 9 FIG. 11 Enlarged front view of a bolt of another embodiment of FIG.

[0039]

[Explanation of symbols]

 1 Clamp main body 1a Vertical part 1b Horizontal part 1c Arc locking side 2 Lid 2a Locking part 2b Locking groove 3 Axis 4 Bolt 5 Nut 6 Axis P Pitch P1 Pitch A Thread B B Thread valley A1 Auxiliary screw A2 Auxiliary screw Mountain

Claims (4)

[Scope of utility model registration request] 1. A bolt 4 pivotally attached to one end of a clamp body 1 so as to engage with an engagement groove 2b opened in an engagement portion 2a of a lid body 2 pivotally attached to the clamp body 1. The pitch P of the screw thread A in the bolt 4 is increased, the maximum inclination angle of the screw thread is 45 degrees from the position orthogonal to the axis of the bolt 4, and the total length of the unit thread of the screw portion is shortened. A tightening member structure in a steel pipe clamp, which is formed by combining a nut 5 that can be screwed with the screw of the bolt 4. 2. A bolt 4 pivotally attached to one end of a clamp body 1 so as to engage with an engaging groove 2b opened in an engaging portion 2a of a lid 2 pivotally attached to the clamp body 1. The pitch P of the screw thread A in the bolt 4 is increased, the maximum inclination angle of the screw thread is 45 degrees from the position orthogonal to the axis of the bolt 4, and the total length of the unit thread of the screw portion is shortened. The auxiliary thread A1 having a pitch P1 having the same size as the pitch P is provided between the thread A in the gap of the large pitch P and one bolt 4 has a plurality of thread A. A tightening member structure in a steel pipe clamp, characterized in that it is formed by an auxiliary screw thread A1 and is formed by combining a bolt 4 thus constructed and a nut 5 which can be screwed into the screw of the bolt 4. 3. A bolt 4 pivotally attached to one end of a clamp body 1 so as to engage with an engaging groove 2b opened in an engaging portion 2a of a lid 2 pivotally attached to the clamp body 1. The pitch P of the thread A in the bolt 4 is increased, and the cross-sectional shape excluding the corners of the thread trough is substantially U-shaped to provide a thread trough B, and the inclination angle of the thread is the axis of the bolt 4. The maximum inclination angle is 45 degrees from the orthogonal position, and the total length of the unit thread of the threaded portion is shortened, and the nut 5 that can be screwed into the screw of the bolt 4 is combined. Tightening member structure for steel pipe clamps. 4. A bolt 4 pivotally attached to one end of a clamp body 1 so as to engage with an engaging groove 2b opened in an engaging portion 2a of a lid 2 pivotally attached to the clamp body 1. The pitch P of the thread A in the bolt 4 is increased, and the cross-sectional shape excluding the corners of the thread trough is substantially U-shaped to provide a thread trough B, and the inclination angle of the thread is the axis of the bolt 4. The maximum pitch angle is 45 degrees from the orthogonal position, the upper limit is 45 degrees, and the overall length of the unit thread of the threaded portion is short.
A plurality of screw threads are provided on one bolt 4 by providing an auxiliary screw thread A1 having a pitch P1 having the same size as the pitch P between the screw threads A and a screw thread B having substantially the same shape as the screw thread B in the gap. Bolt 4 formed by A and auxiliary screw thread A1
And a nut 5 that can be screwed into the screw of the bolt 4 in combination, a tightening member structure in a steel pipe clamp.