JP3000384U - Insulation connection structure of metal members - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an insulating and connecting structure for metal members capable of reliably maintaining insulation between metal members, reducing the number of parts and the number of assembly steps, and reducing costs. In an insulating connection structure for connecting at least two metal members with an insulator interposed, a female screw provided on one of the metal members and a female screw penetrating the other of the metal members and the insulator. And a coupling member that is made of a softer material than the metal member and has an engaging groove that engages the tightening tool, and a male screw is formed on the female screw while the male screw is formed on the female screw. Insulation connection structure of metal members to be inserted.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to an insulating connection structure that connects at least two metal members with an insulator interposed.

[0002]

[Prior art and its problems]

 For example, when connecting another metal member to a metal member while maintaining insulation, a male screw made of an insulating material that penetrates the one metal member and the insulator with the insulator interposed between the two metal members. Is screwed into a female screw formed on the other metal member.

In the case of connecting metal members to each other by such a method, a male screw must be made of an insulating material by matching the diameter and the pitch with the female screw of the other metal member. The male screw manufactured in this manner requires a certain degree of accuracy because the tightening force will fluctuate if the tolerance varies. For this reason, it is necessary to control the accuracy of the male screw, which causes inconvenience such as an increase in product cost.

There is also a method in which a metallic male screw is covered with a collar made of an insulating material and used, but in this case, the number of parts increases and the cost increases. Furthermore, there is also a method in which a pin having insulation and thermoplasticity is used in place of the male screw, and the tip of the pin that penetrates both the metal members and the insulator is caulked by heat to form a dowel and to connect it. In this case, special tools are required, the number of assembling steps increases, and the pins after use cannot be reused. Also, when a dowel made of a different material is adhesively fixed to the tip of an insulating and adhesive pin, the number of assembling steps increases, and the pin used cannot be reused.

[0005]

[The purpose of the device]

 The present invention is made on the basis of the above-mentioned conventional problems, and it is possible to reliably maintain the insulating property between metal members, reduce the number of parts and assembling steps, and reduce the cost. An object is to provide an insulating connection structure for members.

[0006]

[Outline of the device]

 In order to achieve the above object, the present invention provides an insulating connection structure for connecting at least two metal members with an insulator interposed, and a female screw provided on one of the metal members; and the metal member. And a coupling member that penetrates through the insulator and is screwed into the female screw, the coupling member being made of a material softer than the metal member, and engaging groove for engaging the tightening tool. It is characterized in that it is screwed into the female screw while forming the male screw by the female screw.

Further, the present invention provides, in an insulating connection structure for connecting at least two metal members with an insulator interposed, a female screw provided on one of the metal members; and a metal screw of the metal member. A connecting pin penetrating the other and penetrating the insulator and screwed into the female screw; and the connecting pin is made of a synthetic resin material and has an outer diameter larger than the root diameter of the female screw. The female head includes a head having an engaging groove for mating, a shaft having an outer diameter substantially equal to the tooth bottom diameter, and a taper having an outer diameter at the tip substantially equal to the inner diameter of the female screw. It is characterized in that the male screw is inserted into the female screw while forming the male screw.

Further, the present invention provides, in an insulating connection structure for connecting at least two metal members with an insulator interposed, a female screw provided on one of the metal members; and the other of the metal members. A connecting pin penetrating the insulator and screwed into the female screw; and the connecting pin is made of a synthetic resin material, and has an engagement groove for engaging a tightening tool, and a cylindrical shape It is characterized in that it has a posture stabilizing projection having a diameter substantially equal to the inner diameter of the female screw, and is inserted into the female screw while the male screw is formed by the female screw.

[0009]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a perspective view showing a first embodiment of an insulating connection structure of metal members. In this insulating connection structure, 12 is a metal member, 19 is an insulating plate made of an insulating material, 15 is a metallic brush 15, and 21 is a connecting pin.

At the front end of the metal member 12, there is formed a pair of female screws 13 that penetrate in the vertical direction of FIG. A pair of through holes 20 and a pair of through holes 17 facing the pair of internal threads 13 of the metal member 12 are formed in the insulating plate 19 and the metal brush 15, respectively. The metal brush 15 has a pair of arm portions 16 extended to one side, and arcuate contact portions 16a are formed at the tip ends of the pair of arm portions 16, respectively.

The connecting pin 21 is for fixing the metal brush 15 to the metal member 12 and connecting them together. In order to make the hardness smaller than that of the metal member 12, the connecting pin 21 is made of a relatively soft material such as synthetic resin. It is configured. As shown in FIGS. 2 and 3, the connecting pin 21 has a head portion 21a, a shaft portion 21b, a taper portion 21c, and an engagement groove 21d formed in the head portion 21a. The outer diameter of the head portion 21a is made larger than the inner diameters of the through holes 17, 20 and the female screw 13, the outer diameter of the shaft portion 21b is made substantially equal to the root diameter of the female screw 13, and the tip portion of the taper portion 21c is made to be the female screw. It is made substantially equal to the inner diameter of 13 (the tip diameter).

Therefore, when the metal brush 15 is fixedly connected to the metal member 12 by this insulation connection structure, first, the pair of through holes 17 is fitted to the pair of female screws 13 of the metal member 12 to make the metal brush 15. And the insulating plate 19 is interposed between the metal brush 15 and the metal member 12 (FIG. 4). In this state, the connecting pin 21 is passed through the pair of through holes 17 and 20, respectively, the taper portion 21c is abutted against the female screw 13 (FIG. 5), and the engaging groove 21d is engaged with a tightening tool such as a flat head screwdriver. The connecting pin 21 is rotated, for example, in the clockwise direction (arrow A in FIG. 4) while being pressed against the female screw 13 while being combined.

Then, the connecting pin 21 having a hardness smaller than that of the female screw 13 of the metal member 12 is crushed by the peaks and troughs of the female screw 13 in order to crush the taper portion 21c and the shaft portion 21b to form a male screw. While being carried out, the pressing force by the tightening tool and the screw feed force by the formed male screw and female screw advance in the axial direction (Fig. 6). Then, by continuing the rotation operation of the connecting pin 21 in the same direction, the connecting pin 21 further advances in the female screw 13, and the back surface of the head portion 21a is brought into contact with the peripheral portion of the through hole 17 of the metal brush 15, Further movement is restricted (Fig. 7). As a result, the metal brush 15 is fixed to the metal member 12 by the connecting pin 21 made of an insulating material, with the insulating plate 19 interposed between the metal brush 15 and the metal member 12.

Therefore, according to the insulation coupling structure of the present invention, the insulation between the metal member 12 and the metal brush 15 can be reliably maintained. Further, when screwed into the female screw 13, a male screw on the outer periphery of the connecting pin 21 is formed at the same time, so that the diameter and pitch of this male screw are automatically matched with the female screw 13. For this reason, it is not necessary to have high precision in the dimensions such as the diameter of the connecting pin 21 with respect to the female screw 13, so that the precision management of the male screw becomes unnecessary and the product cost can be kept low. In addition, the number of parts can be reduced, the number of assembling steps can be reduced, and the manufacturing cost can be reduced as compared with the conventional method in which a male male screw is covered with a collar made of an insulator. Further, when the connecting pin 21 is screwed, a general male screw driver can be used, and no special tool is required. Further, since the used connecting pin 21 can be rotated in the opposite direction to that at the time of screwing and can be extracted from the female screw 13 for reuse, it is economically efficient.

Next, a second embodiment of the insulation coupling structure will be described with reference to FIGS. The purpose of the second embodiment is to stabilize the posture at the time of screwing in so that the connecting pin 21 is not bent and screwed into the female screw 13. That is, the connecting pin 21 of the second embodiment has the posture stabilizing projection 21e extending below the taper portion 21c in addition to the head portion 21a, the shaft portion 21b, the taper portion 21c and the engaging groove 21d. Have The posture stabilizing projection 21e is formed in a cylindrical shape and has the same diameter as the tip portion of the taper portion 21c, that is, substantially the same diameter as the inner diameter (the tip diameter) of the female screw 13.

When the metal brush 15 is fixedly connected to the metal member 12 using such a connecting pin 21, first, as in the first embodiment, a pair of female screws 13 of the metal member 12 are paired with a pair of female screws 13. The metal brush 15 is positioned by aligning the through holes 17, and the insulating plate 19 is interposed between the metal brush 15 and the metal member 12 (FIG. 11). In this state, the connecting pin 21 is passed through the pair of through holes 17 and 20, respectively, and the posture stabilizing projection 21e is inserted into the female screw 13 (FIG. 12). As a result, in the connecting pin 21, the posture stabilizing projection 21e is fitted to the female screw 13 having substantially the same diameter, so that the approach direction can be aligned with the axial center of the female screw 13.

In this state, a tightening tool such as a flat-blade screwdriver is engaged in the engagement groove 21d, and the tapered portion 21c following the posture stabilizing projection 21e is pushed into the female screw 13 while the connecting pin 21 is rotated clockwise (see FIG. 11. Turn to arrow B). Then, the connecting pin 21 of which hardness is smaller than that of the female screw 13 of the metal member 12 is crushed in order by the taper portion 21c and the shaft portion 21b to form a male screw and advances in the axial direction (FIG. 13). At this time, since the connecting pin 21 is guided by moving the posture stabilizing projection 21e along the inner circumference of the female screw 13, the connecting pin 21 is properly screwed into the female screw 13 without bending in the entering direction.

Then, by continuing the rotating operation of the connecting pin 21 in the same direction, the connecting pin 21 moves more stably in the female screw 13, and the back surface of the head portion 21 a passes through the through hole 17 of the metal brush 15. It is applied to the peripheral area and further entry is restricted (Fig. 14). As a result, the metal brush 15 is fixed to the metal member 12 by the connecting pin 21 made of an insulating material, with the insulating plate 19 interposed between the metal brush 15 and the metal member 12. Therefore, in addition to the effects of the insulation coupling structure of the first embodiment described above, the insulation coupling structure of the second embodiment does not bend the posture of the coupling pin 21 without paying special attention. It is possible to achieve the effect of accurately screwing into 13.

[0019]

As described above, according to the present invention, it is possible to connect at least two metal members in a state in which the insulation is reliably maintained. Further, since the conventional male screw having improved precision by matching the diameter and the pitch with the female screw of the metal member is not required and the precision control of the male screw is not required, there is no fear of increasing the product cost. Further, it is possible to reduce inconveniences such as variations in tightening force due to variations in tolerance. Furthermore, since it is not necessary to cover the male male screw with a collar or heat crimp the tip of the insulating and thermoplastic pin with a special tool, the number of parts and the number of assembly steps can be reduced to reduce costs. It becomes possible. In addition, since the fixed side can be a general standard female screw, if insulation is not required, a general screw can be replaced as it is, and it can be applied as it is to a tap hole already existing for general screws. Since it is possible, it is extremely versatile.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of an insulating connection structure for metal members according to the present invention.

FIG. 2 is a perspective view showing a unitary shape of a connecting pin of the first embodiment.

FIG. 3 is a perspective view showing a unitary shape of the connecting pin of the first embodiment, as viewed from a direction different from FIG. 2.

FIG. 4 is a side view showing a process of screwing a connecting pin into a metal member.

FIG. 5 is a side view showing a process of screwing the connecting pin into the metal member.

FIG. 6 is a side view showing a process of screwing a connecting pin into a metal member.

FIG. 7 is a side view showing a step of screwing a connecting pin into a metal member.

FIG. 8 is a perspective view showing a second embodiment of a metal member insulating and connecting structure according to the present invention.

FIG. 9 is a perspective view showing a unitary shape of a connecting pin of the second embodiment.

FIG. 10 shows the unitary shape of the connecting pin of the second embodiment,
It is the perspective view seen from the direction different from FIG.

FIG. 11 is a side view showing a step of screwing the connecting pin into the metal member.

FIG. 12 is a side view showing a step of screwing the connecting pin into the metal member.

FIG. 13 is a side view showing a step of screwing the connecting pin into the metal member.

FIG. 14 is a side view showing a step of screwing a connecting pin into a metal member.

[Explanation of symbols]

 12 metal member 13 female screw 15 metal brush 16 arm part 16a contact part 17 20 through hole (connecting member through hole) 19 insulating plate 21 connecting pin (connecting member) 21a head part 21b shaft part 21c taper part 21d engaging groove 21e posture Stable protrusion

Claims (6)

[Scope of utility model registration request] 1. An insulating connection structure for connecting at least two metal members with an insulator interposed therebetween, wherein a female screw provided on one of the metal members; and the other of the metal members and the insulator. A connecting member penetrating therethrough and screwed into the female screw; the connecting member is made of a material softer than the metal member, and has an engaging groove for engaging a tightening tool; An insulating connection structure for a metal member, wherein the metal member is screwed into the female screw while being formed. 2. The connecting member according to claim 1, wherein the connecting member is a connecting pin made of a synthetic resin material, and has a head portion having an outer diameter larger than the root diameter of the female screw and an outer diameter substantially equal to the root diameter. An insulating connection structure of a metal member having a shaft portion. 3. The metal member according to claim 2, wherein the connecting member has an outer diameter substantially equal to an inner diameter of the female screw and has a posture stabilizing protrusion for maintaining a posture when the connecting member is screwed into the female screw. Insulation connection structure. 4. The pair of female screws of one of the metal members according to claim 1, wherein the other one of the metal members and the insulator each have a pair of connecting member through holes facing the pair of female screws. Insulation connection structure of existing metal members. 5. An insulating connection structure for connecting at least two metal members with an insulator interposed therebetween, wherein a female screw provided on one of the metal members; and the other of the metal members and the insulator. A connecting pin penetrating therethrough and screwed into the internal thread; and the connecting pin is made of a synthetic resin material and has an engagement groove with an outer diameter larger than the root diameter of the internal thread for engaging the tightening tool. A head portion, a shaft portion having an outer diameter substantially equal to the tooth bottom diameter, and a taper portion having an outer diameter at the tip portion substantially equal to the inner diameter of the female screw, and the female screw is screwed to the female screw while forming the male screw. An insulating connection structure for metal members, which is characterized by being inserted. 6. An insulating connecting structure for connecting at least two metal members with an insulator interposed, wherein a female screw provided on one of the metal members; and the other of the metal members and the insulator. A connecting pin penetrating therethrough and screwed into the female screw; the connecting pin is made of a synthetic resin material, has an engaging groove for engaging a tightening tool, and has a cylindrical shape and an outer diameter of the female screw. And a posture stabilizing projection formed to have a diameter substantially equal to the inner diameter of the female thread, and the male thread is screwed into the female thread while the male thread is formed by the female thread.