JP2613293B2 - Clamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a clamp for indicating an electric wire, a cable, a cord, a pipe, and the like on a mounting plate.

[Prior art] Conventionally, electronic devices have been designed to prevent the occurrence of jamming radio waves and adversely affecting surrounding devices, and to prevent the devices from malfunctioning in response to external jamming radio waves. Is provided with an electromagnetic wave shield for shielding electromagnetic waves.

Such an electromagnetic wave shield is achieved by making the portions that perform the shielding function the same potential, and is applied to a box that houses the electronic device and a conductor that transmits signals of the electronic device. Therefore, the electromagnetic wave shield of the electronic device connects shielded portions such as a box and a conductive wire to a constant potential, and in many cases to a ground line.

[Problems to be solved by the invention] However, in the conventional technology, in order to perform shielding,
It is necessary to provide a grounding terminal for each of the portions to be electrically connected, and to connect them by wiring. As a result, there is a problem in that the wiring is stretched vertically and horizontally in the electronic device, which complicates the operation, and the number of steps and the number of parts for assembling the ground terminal and the wiring increases.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of electrical connection steps of an electromagnetic wave shielding portion, or the number of parts and the number of parts for assembling ground wiring and terminals of a ground circuit, by solving the above problems.

Means for Solving the Problems According to the present invention, which has been made to achieve the above object, there is provided an enclosing portion for enclosing a held member such as an electric wire, a cable, a cord, and a pipe; A pair of mounting portions extending in the direction opposite to each other, and a hole for penetrating the pair of mounting portions and inserting a screw or the like for fixing to a predetermined mounting plate; In a clamp formed so as to be elastically deformable by a material, a conductive member is disposed from the inner periphery of the surrounding portion to each of the opposing surfaces of the pair of mounting portions, and one of the pair of mounting portions is provided. , A contact portion that is in contact with the mounting plate, the other is a fastening portion that is placed on a surface of the corresponding contact portion that does not contact the mounting plate, and that tightens the surrounding portion when the hole is screwed. Further, at least the contact at the fastening portion Around the hole in the surface not facing the part, characterized in that a conductor connecting portion to be electrically connected to the conducting member.

[Operation] In the clamp of the present invention, the held member is held by the surrounding portion, the contact portion is brought into contact with a predetermined mounting plate, and the fastening portion is placed on the contact portion. When a screw is inserted into the hole formed in the contact part and the tightening part and fixed to the predetermined mounting plate,
At the same time, since the surrounding portion acts to tighten the held member, the conductive member disposed on the inner periphery of the surrounding portion is pressed against the held member.

As a result, if the conductive portion is exposed on the outer periphery of the held member, the electrical connection between the conductive portion and the conductive member is held by the pressing force of the surrounding portion.

Moreover, since the conductive member is disposed from the inner periphery of the surrounding portion to each of the opposing surfaces of the pair of mounting portions, the conducting portion of the held member conducts even when contacting any portion of the inner periphery of the surrounding portion, At the time of mounting, the conductive members on the contact portion side and the tightening portion side come into contact with each other on the opposing surface of the mounting portion and conduct, so that the conductive member on the tightening portion side and the conductive member on the contact portion side in the surrounding portion. Even when the conductive member is separated, the conductive member on the contact portion side is reliably connected to the conductor connecting portion.

In addition, when a screw is inserted into the hole, the conductor connection portion formed around the hole on the surface of the fastening portion that does not face the contact portion contacts the head of the inserted screw, Contacts the mounting plate inside the mounting plate. For this reason, when the screw and the mounting plate are formed of a conductive material, the conductive member conducts with the mounting plate via the conductor connection portion and the screw.

Furthermore, since the conductor connection portion is formed around the hole on the surface of the fastening portion that does not face the contact portion, an external conductor such as a ground wire is placed on the conductor connection portion and the conductor connection portion is brought into contact with the conductor. The external conductor can be easily connected to the conductor connection part simply by screwing.

Example Next, an example of the clamp of the present invention will be described.

FIG. 1 is a perspective view of the grounding clamp 1 of the first embodiment, and FIG. 2 is a sectional view taken along line AA of FIG.

The grounding clamp 1 of the present embodiment includes an insulated wire for electronic equipment,
Shielding layer of copper braid as in control and instrumentation cables
The cable 2b having the cable 2a is supported by a clamp member 3 on a mounting plate (not shown), and the conductive member 5 simultaneously grounds the cable 2b to the shielding layer 2a. The components will be described below.

Clamping member 3: The clamping member 3 is formed by molding an insulating plastic material into a strip shape. As shown in FIG. 1, an enclosing portion 7 surrounding the cable 2b and an end 9 of the enclosing portion 7 are provided. , 11 and a mounting plate 13 for tightening both ends 9, 11 so as to reduce the diameter of the surrounding portion 7 and mounting the clamp member 3 to the mounting plate. The mounting plate 13 formed at the end portions 9 and 11 of the surrounding portion 7 is formed so as to be continuous with one end portion 9, and is connected at a right angle to the abutting portion 15 that is in contact with the mounting plate and the other end portion 11. And a fastening portion 17 for fastening the surrounding portion 7 to the contact portion 15 side.

Two holes 19 and 21 for screwing the clamp member 3 are formed in the contact portion 15 that contacts the mounting plate.
Also, one hole 23 is formed in the fastening portion 17. As a result, the hole 23 of the fastening portion 17 and one of the holes 19, 2 of the contact portion 15 are formed.
1 and a screw (not shown) can be passed through it, and the clamp member 3 can be fixed to the mounting plate together with the screw.

The two holes 19 and 21 of the contact portion 15 are for appropriately setting the tightening state of the cable 2b by the surrounding portion 7, and are appropriately selected according to the outer diameter of the cable 2b.

Conductive member 5: The conductive member 5 is connected to the inner side of the surrounding portion 7 of the clamp member 3, that is, the cable 2b by the surrounding portion 7.
It is arranged on one side of the side on which is tightened. As shown in FIG. 1 and FIG. 2, this is a conductive strip formed by forming a conductive thin metal wire into a stitch and forming a double-folded strip.
25, and an elastic member 27 which is placed in the folded portion of the conductive band 25 and generates elasticity of the conductive member 5. As shown in FIG. 2, as the elastic member 27, an annular member having elasticity, for example, a soft vinyl chloride tube may be used, or a string-like member having elasticity, a plate-like member,
For example, a molded polyurethane foam member may be used.

Further, one end 29 of the conductive member 5 extends along the fastening portion 17 of the clamp member 3 to the hole 23 formed in the fastening member 17. A conductor connecting portion 31 for connecting the conductive member 5 to an external conductor (not shown) is attached to the hole 23 to which the one end 29 of the conductive member 5 reaches. The conductor connection portion 31 is formed by caulking one end 29 of the conductive member 5 and the periphery of the hole 23 with a metal tube. on the other hand,
In FIG. 1, the other end of the conductive member 5 appears to be interrupted at the end 9 of the enclosing portion 7, but actually, the tip of the contact portion 15 extends along the contact portion 15 of the clamp member 3. Department has been reached. The same applies to the expanded metal 41 and the conductive band 55 as the conductive member 5 in FIGS. 3 and 4 described later.

In the first embodiment described above, the grounding clamp 1 surrounds the cable 2b with the surrounding portion 7 of the clamp member 3.
The mounting portion 13 can be mounted on a mounting plate. Thereby, electrical continuity between the shield layer 2a of the cable 2b and the conductor connection portion 31 is obtained. Therefore, when the mounting plate is a metal box for housing the electronic device, the mounting portion 13 is simply attached to the mounting plate with a metal screw, and conduction between the shielding layer 2a of the cable 2b and the box is established. As a result, these potentials can be made the same.

Also, an external conductor such as a ground wire is weighed on the conductor connection portion 31,
The shield layer 2a can be grounded by attaching the clamp member 3 to the attachment plate with these connected.

In addition, since the conductive band 25 is constantly pressed against the cable 2b by the elastic member 27, conduction between the shielding layer 2a and the conductor connection portion 31 is ensured, and this state can be maintained for a long time. .

In addition, since the outer peripheral surface of the clamp member 3 is insulative, even if an external conductor touches the clamp member 3, a short circuit will not occur between them. Accordingly, it is not necessary to particularly consider insulation between the external conductor and the clamp member 3.

As a result, there is an extremely excellent effect that the number of steps for attaching the cable 2b, grounding and the like can be reduced, and the reliability and reliability of grounding can be improved.

In the grounding clamp 1 of the first embodiment, the conductive member 5 may have any configuration as long as it has conductivity and elasticity.

Therefore, as the conductive member 5, for example, as shown in FIG. 3, an expanded metal 41 may be used, or a mesh tape, a conductive elastomer, or a member obtained by bending a metal plate into a nail shape may be used. .

Further, the grounding clamp 1 may support the cable 2b, or may support a metal pipe or a flexible conduit.

Next, a second embodiment will be described with reference to FIG.

The grounding clamp 51 of the present embodiment is obtained by adding a pointed projection 53 to the grounding clamp 1 of the first embodiment.

That is, as shown in FIG. 4, a conductive band 55 having elasticity is provided on the inner peripheral side of the surrounding portion 7 and the conductive band 55 is provided.
A plurality of metal pointed projections 53 having sharply pointed tips are provided in the center 55 toward the center.

The ground clamp 51 described above can ground the cable without removing the insulating layer of the cable. That is, as shown in FIG. 4, in the cable 63 in which the shielding conductor 59 is covered by the insulating sheath 61,
Without removing the cable 63
By attaching to the mounting plate 65, the pointed projection 53 breaks through the insulating sheath 61 to reach the shielding conductor 59, and the conductor connecting portion
Conduction between the shield conductor 31 and the shield conductor 59 can be established.

Therefore, according to the present embodiment, it is not necessary to remove the insulating sheath 61 of the cable 63, so that the number of steps of the grounding work is reduced, the damage of the cable 63 is minimized, and the durability of the cable 63 is improved.

It should be noted that the present invention is not limited to the above-described embodiment, and various embodiments can be made without departing from the spirit of the invention.

For example, as shown in FIG. 5, both ends 207 and 209 of the conductive member 205 disposed on the inner peripheral side of the clamp member 203, or at least the end 207 on the attachment portion side are on the outer peripheral side of the clamp member 203. The grounding clamp 211 may be configured so as to extend to and cover the periphery of a hole for inserting a screw or the like.

[Effects of the Invention] In the clamp of the present invention, a conductive member is provided from the inner periphery of the surrounding portion to each of the opposing surfaces of the pair of mounting portions, and furthermore, the conductor connecting portion that conducts with the conductive member is provided in the fastening portion. It is provided around the hole on the surface that does not face the contact portion.

Therefore, when the mounting plate to which the clamp is attached has conductivity, the held member is held by the surrounding portion,
Simply by penetrating the hole of the mounting part consisting of the screw contact part and the tightening part with conductivity and fixing it to the mounting plate, the head of the screw comes into contact with the conductor connection part, and the tip of the screw is attached to the mounting plate. The conductor exposed on the outer periphery of the held member is electrically connected to the mounting plate via the conductive member, the conductor connecting portion, and the screw because the conductor is fixed to the mounting hole formed in the mounting member and is electrically connected to the mounting plate. Therefore, the held member can be easily grounded.
Moreover, since the screws are conducted inside the mounting plate,
Even if the surface of the mounting plate is insulated by painting or the like, it is possible to ensure conduction.

Further, even when the mounting plate does not have conductivity, an external conductor such as a ground wire is overlapped on the conductor connection portion, and in a state where these are brought into contact with each other, the holes in the mounting portion are penetrated using screws or the like. By simply fixing the member to the mounting plate, the held member can be easily grounded.

As a result, attaching the held member to the attachment plate,
Conduction between the held member and the conductor connection portion can be performed at the same time, so that the number of work steps can be reduced. In addition, since the conductive member is constantly urged by the held member, it can be used for a long time. , Conduction can be stably obtained, and high reliability can be obtained.

Further, since the conductive member is provided from the inner periphery of the surrounding member to each of the opposing surfaces of the pair of mounting portions, for example, even if the conductive portion of the held member exists only in a specific direction, the Irrespective of the contact position between the conductive member of the clamp and the conductive part of the held member, there is no problem simply by attaching the held member to the clamp regardless of the position, and the conduction between them can be easily ensured. Conduction between them can be maintained, and high reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of the grounding clamp of the first embodiment, FIG. 2 is a sectional view taken along line AA, FIG. 3 is a perspective view of a modified example thereof, and FIG.
The figure is a perspective view of the second embodiment, and FIG. 5 is a front view of a modification. 1,51,211 Ground clamp, 3,203 Clamp member 5,205 Conductive member, 7 Surrounding part, 13 Mounting part, 25
... conductive band 27 ... elastic member, 31 ... conductor connection part, 53 ... pointed projection

Claims (1)

(57) [Claims] An enclosure surrounding a member to be held, such as an electric wire, a cable, a cord, a pipe, etc., a pair of opposed mounting parts extending in substantially the same direction from both ends of the enclosure, And a hole through which a screw or the like for fixing to a predetermined mounting plate is inserted through the mounting portion, and a clamp formed so as to be elastically deformable by a predetermined non-conductive material. A conductive member is provided from the periphery to each of the opposing surfaces of the pair of mounting portions, and one of the pair of mounting portions is a contact portion that is in contact with the mounting plate, and the other is a contact portion. A fastening portion that is placed on a surface of the contact portion that does not contact the mounting plate and that tightens the surrounding portion when the hole is screwed, and at least a surface of the fastening portion that does not face the contact portion. Around the hole of the conductive member, Clamp, characterized in that a connection portion.