JPH0819930B2 - Connection structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure, and more particularly to a connecting structure for connecting two connecting members while maintaining electrical continuity.

[0002]

2. Description of the Related Art A conventional connecting structure will be described below with reference to the drawings. FIG. 5: is a figure explaining the outline of the lightning rod which has the conventional connection structure.

As shown in FIG. 5, the lightning rod 10 has one end embedded in the ground, absorbs electricity from the lightning, and grounds the absorbed electricity to the ground to prevent the lightning from falling into the house 111 or the like. Is. In order to absorb the electricity due to lightning, it is necessary to use the lightning rod 10 that is sufficiently higher than the height of the house 111 to be lightning struck. For this reason, the lightning rod 10 has a long overall length, and is usually composed of a plurality of members in consideration of workability during assembly. At this time, each member needs to be electrically connected including the connecting portion.

FIG. 6 is a view showing the structure of the portion A of the lightning rod 10 having the above-mentioned conventional connecting structure. In FIG.
The lightning rod 10 includes a protrusion 11, a coupling 3, and a support tube 4.

The projecting needle 11 is made of a metal having electrical continuity, and has a male screw portion for connecting to one end. The coupling 3 is made of a metal material having electrical continuity and has a female screw portion that is screwed into the male screw portion of the protruding needle 11. When the male thread portion of the projecting needle 11 and the female thread portion of the coupling 3 are screwed together, the projecting needle 11 and the coupling 3 are connected. The support tube 4 is made of a metal material having electrical conduction, and is connected to the coupling 3 by brazing.

As described above, the lightning rod is composed of a plurality of constituent parts of the projecting needle 11, the coupling 3, and the support tube 4, and the constituent parts are connected by screwing and brazing.

[0007]

As described above, since the coupling 3 and the support tube 4 are connected by brazing,
It is possible to maintain a stable connected state over a long period of use, but since the connection between the protruding needle 11 and the coupling 3 is connected only by screwing, vibration caused by wind and rain, especially wind force, over a long period of use. Due to the above reasons, the connected screw portion is easily loosened, and the protruding needle portion comes off from the coupling.

A method of applying an adhesive to the threaded portion and fixing it before screwing the projecting needle 11 and the coupling 3 together is conceivable. In this case, the current-carrying performance required for the lightning rod is impaired. There is a risk that the adhesive will deteriorate in adhesion performance due to wind, rain, sunlight, etc., and there is a problem that the loosening of the connecting portion cannot be prevented after long-term use.

The present invention has been made to solve the above problems, and an object thereof is to provide a connecting structure capable of completely preventing the connecting portion of the lightning rod from being loosened without deteriorating the current-carrying performance. And

[0010]

The connecting structure of the present invention includes a first connecting member having a male screw portion, which is a protruding needle of a lightning rod, and a female screw portion which is screwed to the male screw portion. The second coupling member includes a second coupling member to be coupled and an arc-shaped rotation blocking member having both ends. The first coupling member further includes an annular groove for mounting the rotation blocking member, and one end of the rotation blocking member. A stop hole for fixing the portion, one end of the rotation preventing member is fixed to the stop hole of the first connecting member, and the other end abuts the surface of the female screw portion of the second connecting member, A rotation blocking member is mounted in the annular groove of the first connecting member.

[0011]

In the connecting structure of the present invention, the rotation blocking member is moved from the abutting end to the fixed end in the first direction.
When the connecting member is rotated, the abutting end of the rotation preventing member slides while contacting the surface of the female screw portion of the second connecting member, so that the first connecting member is rotated and screwed into the second connecting member. On the other hand, when it is rotated in the opposite direction to the above, the abutting end of the rotation preventing member bites into the female screw portion of the second connecting member, and it is possible to prevent rotation of the first connecting member. Become.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A connecting structure according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a lightning rod of an embodiment of the present invention. The projecting needle 1 is made of a metal material having electrical conductivity, and has a male screw portion formed at its end. An annular groove 1a having a predetermined shape is formed at a predetermined position of the male screw portion, and a stop hole 1b is formed at a predetermined position of the annular groove 1a. A rotation blocking member 2 to be described later is provided in the annular groove 1a.
Is attached, and one end of the rotation blocking member 2 is fitted into the stop hole 1b to fix the rotation blocking member 2 to the protruding needle 1.

FIG. 2 is a view showing a rotation preventing member of a lightning rod according to an embodiment of the present invention. As shown in FIG. 2, the rotation blocking member 2 has an arc shape, and the length of the rotation blocking member 2 is set to about 30% to 70% of the circumference of the protruding needle 1 to be mounted and fixed. The end 2a is bent by about 90 ° by bending. As the material of the rotation blocking member 2, a steel material having a spring property, a stainless material, a phosphor bronze material, a high strength brass material, or the like can be used. The rotation preventing member 2 may be formed by bending a wire rod into a predetermined shape as shown in FIG. 2, or may be formed into a plate shape by punching into a predetermined shape. In the case of a wire rod, a linear wire having a thread pitch of about 30% to 65% of the threaded portion of the connecting portion can be used.
The cross-sectional shape of the rotation blocking member 2 is not limited to the above-mentioned circular shape or quadrangular shape, and other shapes such as a triangle or a trapezoid can be used in consideration of slipping or biting into the female thread portion of the coupling 3 described later. is there. Further, the rotation blocking end 2b of the rotation blocking member may be slightly deformed in the outer peripheral direction in consideration of the biting to be described later to facilitate the biting. The amount of deformation described above can be adjusted by the spring property of the rotation blocking member 2 and does not hinder workability during mounting.

FIG. 3 is a circumferential sectional view showing a state in which the rotation preventing member 2 is mounted. Here, the lightning rod of the present embodiment is the same as that shown in FIG.
The same parts as the conventional lightning rod shown in are used. As shown in FIG. 3, the rotation blocking member 2 is mounted between the protruding needle 1 and the coupling 3, and is fixed to the protruding needle 1 by engaging the fixed end 2 a with the stop hole 1 b of the protruding needle 1. On the other hand, the rotation blocking end 2 b of the rotation blocking member 2 is in contact with the surface of the female screw portion of the coupling 3. This contact state is realized by the spring property of the rotation blocking member 2, and even if an error occurs in the shapes of the protruding needle 1, the rotation blocking member 2, and the coupling 3 during processing, the rotation blocking member 2 absorbs them. It is possible to process each member easily.

Next, the operation of the rotation preventing member 2 when the projecting needle 1 is connected to the coupling 3 will be described. When the projecting needle 1 is rotated from the rotation blocking end 2b of the rotation blocking member 2 toward the fixed end 2a (direction A) and the projecting needle 1 is screwed into the coupling 3, the rotation blocking member 2 is fixed to the projecting needle 1, so that the projecting needle 1 is fixed. In response to the rotation of 1, the outer peripheral portion of the rotation blocking member 2 slides while contacting the surface of the female screw portion of the coupling 3, and the protruding needle 1 can be screwed into the coupling 3. At this time, the tightening torque required for the rotation of the protruding needle 1 is only the tightening torque by the normal screw portion and the friction torque due to the sliding of the rotation preventing member 2 and the coupling 3, and the torque due to this friction is very small. It becomes possible to sufficiently tighten with the normal tightening torque.
Therefore, when tightening, no special tool is required and workability is not hindered.

On the other hand, when the protruding needle 1 is rotated in the opposite direction (B direction), the rotation blocking end 2b of the rotation blocking member 2 is
It bites into the surface of the female thread portion of the coupling 3 and blocks the rotation of the projecting needle 1. At this time, if further rotation is attempted, the rotation blocking member 2 is deformed, and the outer peripheral surface of the rotation blocking member 2 makes strong contact with the surface of the female screw portion of the coupling 3 to increase the frictional force and prevent rotation. The power to do so becomes even greater. Therefore, the rotation in the B direction is completely blocked, and once the protruding needle is rotated in the A direction, the protruding needle 1 is coupled to the coupling 3
When the screw is connected by screwing, it does not rotate in the opposite direction at all, so that it is possible to completely prevent the connecting portion from loosening.
Further, as described above, since the effect of preventing rotation is independent of the tightening torque of the needle 1, no special torque management is required when tightening the needle 1, so the workability at the time of attachment is improved, and It will be simple. As a result, when performing work at a high place like a lightning rod, the worker will be safe when working.

FIG. 4 is an axial sectional view showing a state in which the rotation preventing member is mounted. As shown in FIG. 4, the annular groove 1a for mounting the rotation preventing member 2 is formed by cutting the two crests of the male screw portion of the protruding needle 1. In this case, assuming that the number of effective threads for engaging the male thread portion of the projecting needle 1 and the female thread portion of the coupling 3 is 2.5, the rotation inhibiting member 2 can be used for any screw as long as there are about 5 thread portions or more.
Can be attached. As described above, the rotation blocking member 2 can be mounted by processing only on the side of the needle 1 having a male screw portion, so that the needle 1 is replaced even when applied to an already installed lightning rod. Only then, the connection structure of the present invention can be applied, and it can be easily applied to the lightning rod already installed.

Further, in the coupling structure of this embodiment, since rotation is mechanically prevented, it is not necessary to use a non-conductive material such as an adhesive between the projecting needle 1 and the coupling 3, and it is necessary for the lightning rod. It does not lower the energizing performance. Therefore, with the above configuration, it is possible to completely prevent the loosening of the connecting portion without deteriorating the energization performance.

In this embodiment, the application in the connection between the projecting needle 1 and the coupling 3 has been described, but the other connection portions can be similarly applied as long as they are connected by using the screw portion. Is. Also, an example in which one rotation preventing member 2 is provided in one connecting portion has been described, but the same effect can be obtained even if a plurality of rotation preventing members are provided in one connecting portion, and the rotation preventing force can be reduced. It is possible to further improve.

[0021]

In the connecting structure of the present invention, the rotation preventing member allows only one direction of rotation of the first connecting member,
Since the rotation in the other direction is blocked, the first connecting member and the second connecting member are prevented.
It is possible to completely prevent loosening of the connecting portion with the connecting member, and since it is not necessary to use an adhesive or the like, there is no reduction in current-carrying performance.

[Brief description of drawings]

FIG. 1 is a diagram showing a lightning rod of a lightning rod according to an embodiment of the present invention.

FIG. 2 is a diagram showing a rotation preventing member of a lightning rod according to an embodiment of the present invention.

FIG. 3 is a sectional view in a circumferential direction showing a state in which a rotation blocking member is mounted.

FIG. 4 is an axial cross-sectional view showing a state in which a rotation blocking member is mounted.

FIG. 5 is a diagram illustrating an outline of a lightning rod having a conventional connecting structure.

FIG. 6 is a diagram showing a structure of a lightning rod having a conventional connecting structure.

[Explanation of symbols]

 1 Protrusion Needle 2 Rotation Blocking Member 3 Coupling 4 Support Tube 2a Fixed End 2b Rotation Blocking End

Claims (1)

[Claims] 1. A first connecting member having a male screw portion, which serves as a protrusion of a lightning rod, and a second connecting member, which has a female screw portion that is screwed into the male screw portion, and is connected to the first connecting member, An arc-shaped rotation blocking member having both ends, wherein the first connecting member further includes an annular groove for mounting the rotation blocking member, and a stopper for fixing one end of the rotation blocking member. A rotation preventing member such that one end of the rotation preventing member is fixed to the stop hole of the first connecting member and the other end of the rotation preventing member abuts on a surface of the female screw portion of the second connecting member. A connecting structure in which a member is mounted in the annular groove of the first connecting member.