JPH02284366A - Clamp - Google Patents

Abstract

PURPOSE:To reduce the number of processes of mounting a cable and doing the resultant earthing work by constructing an insulating clamping member or a conductive member which is arranged in the internal circumference of the insulating clamping member in such a manner that the clamping member or the conductive member is elastically deformable in the radial direction thereof. CONSTITUTION:A clamping member 3 or a conductive member 5 is constructed to be elastically deformable in the radial direction thereof. The mutual electric connecting condition of the conductive part 2a of a member 2b being retained and the conductive member 5 is retained by push pressure derived from the clamping member 3 and by urged force derived from elastic deformation if the member 2b being retained is, for example, conductive. Meanwhile, such an external conductor as a conductive lead, or as a foil body or the like is connected to the connector-connecting portion 31 of the conductive member 5 so as to make electric connection of the conductive part 2a of the member 2b being retained to the external conductor. Besides, there may be no short circuit of a conductive body to the conductive part 2a of the member 2b being retained and to the conductive member 5 even if this conductive body contacts the clamping member 3 since the clamping member 3 has its insulating property. This may reduce the number of processes of mounting a cable onto a mounting sheet and doing the resultant earthing work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clamp for supporting electric wires, cables, cords, piping, etc. on a mounting plate.

[Prior Art] Conventionally, electronic devices have been equipped with electronic devices to prevent them from generating interference radio waves and having a negative effect on surrounding equipment, and to prevent the devices from malfunctioning due to interference radio waves from outside. is equipped with an electromagnetic shield that blocks electromagnetic waves.

Such electromagnetic shielding is achieved by making the parts that perform the shielding function have the same potential, and is applied to the box that houses the electronic device and the conductive wire that transmits the signal of the electronic device. Therefore, electromagnetic wave shielding for electronic equipment connects shielding parts such as boxes and conductive wires to a constant potential, often a ground line.

[Problems to be Solved by the Invention] However, in the conventional technology, in order to perform shielding, it was necessary to provide a ground terminal for each part to be electrically conductive and to connect these with wiring.

As a result, there are problems in that the wiring is stretched across the electronic device and becomes complicated, and that the number of man-hours and parts for assembling the ground terminal and the wiring increases.

An object of the present invention is to solve the above-mentioned problems, thereby reducing the number of electrical connection steps for the electromagnetic wave shielding part, the number of steps for assembling the ground wiring and terminals of the grounding circuit, and the number of components.

[Means for Solving the Problems] As a means for achieving the above object, the clamp of the present invention is a clamp that supports a member to be held, such as an electric wire, cable, cord, or piping, on a mounting plate, and the clamp supports at least an insulating layer. The clamp includes a clamp member that supports a member to be held, an electrically conductive member disposed on the inner periphery of the clamp member, and a conductor connection portion that connects the electrically conductive member to an external conductor. A clamp in which a member or a conductive member is configured to be elastically deformable in the radial direction of the clamp member.

[Function] In the clamp of the present invention, by holding the member to be held by the clamp member having an insulating layer, the electrically conductive member disposed on the inner periphery of the clamp member is pressed against the member to be held. , the clamp member, or the conductive member is elastically deformed in the radial direction of the clamp member.

Thereby, for example, if the member to be held is electrically conductive, the state of electrical connection between the electrically conductive portion and the electrically conductive member is maintained by the pressing force of the clamp member and the urging force due to elastic deformation. Further, by connecting a conductive wire or an external conductor such as a box to the conductor connection portion of the conductive member, the conductive portion of the held member and the external conductor are electrically connected. Furthermore, since the clamp member has an insulating layer, even if a conductive object comes into contact with the clamp member, there will be no short circuit between the object, the conductive portion of the held member, and the conductive member. do not have.

[Example] Next, an embodiment of the clamp of the present invention will be described.

FIG. 1 shows a perspective view of a grounding clamp 1 according to a first embodiment,
FIG. 2 shows its AA sectional view.

The grounding clamp 1 of this embodiment has a shielding layer 2 of copper wire braid, such as that found in insulated wires for electronic equipment, control cables, instrumentation cables, etc.
The cable 2b provided with the cable 2b is supported on a mounting plate (not shown) by the clamp member 3, and at the same time, the cable 2b is grounded to the shielding layer 2a by the conductive member 5.

Each part will be explained below.

Clamp member 3: The clamp member 3 is made of an insulating plastic material formed into a band shape, and as shown in FIG. , 11, both ends 9.degree. 11 are tightened so that the diameter of the surrounding portion 7 is reduced, and a mounting portion 13 is provided for attaching the clamp member 3 to a mounting plate. Attachment portions 13 configured on the ends 9 and 11 of the surrounding portion 7
A contact portion 15 is formed continuous with one end portion 9 and comes into contact with the mounting plate, and a tightening portion is formed continuous with the other end portion 11 at right angles and tightens the surrounding portion 7 toward the contact portion 15 side. Part 17
It consists of

Two holes 19, 21 for screwing the clamp member 3 are formed in the abutting portion 15 that abuts the mounting plate. Further, one hole 23 is formed in the tightening portion 17.

This makes it possible to pass a screw (not shown) through the hole 23 of the tightening part 17 and one of the holes 19.21 of the contact part 15, and fix the clamp member 3 to the mounting plate together with this screw. can.

The two holes 19 and 21 in the abutment part 15 are designed to ensure that the cable 2b is properly tightened by the surrounding part 7, and are appropriately selected depending on the outer diameter of the cable 2b. be.

Conductive member 5: The conductive member 5 is 1. It is disposed on one surface of the clamp member 3 on the inner peripheral side of the enclosing part 7, that is, on the side on which the enclosing part 7 tightens the cable 2b. As shown in FIGS. 1 and 2, this consists of a conductive band 25 made of thin conductive metal wires in the form of a mesh, a conductive band 25 which is folded into two, and a conductive band 25 that is folded into two. , and an elastic member 27 that generates elasticity in the conductive member 5. As the elastic member 27, as shown in FIG. 2, an elastic tubular member such as a soft vinyl chloride tube may be used, or an elastic string-like member or plate-like member such as a molded polyurethane member may be used. Foam members may also be used.

Further, one end 29 of the conductive member 5 is connected to a hole 23 formed in the clamping member 17 along the clamping part 17 of the clamping member 3.
It has reached this point. A conductor connecting portion 31 for connecting the conductive member 5 and an external conductor (not shown) is attached to the hole 23 that the one end 29 of the conductive member 5 reaches. The conductor connection portion 31 is constructed by caulking one end portion 29 of the conductive member 5 and the periphery of the hole 23 with a metal tube.

The grounding clamp 1 of the first embodiment described above surrounds the cable 2b with the surrounding part 7 of the clamp member 3,
It can be attached to a mounting plate by the mounting portion 13. As a result, the shielding layer 2a of the cable 2b and the conductor connection portion 31
Electrical continuity can be established between the two. Therefore, if the mounting plate is a metal box housing an electronic device, simply attaching the mounting part 13 to the mounting plate with metal screws will ensure continuity between the shielding layer 2a of the cable 2b and the box. These potentials can be made the same.

Also, place an external conductor such as a ground wire on the conductor connection part 31,
By attaching the clamp member 3 to the mounting plate in a state where these are connected, the shielding layer 2a can be grounded.

Moreover, since the conductive band 25 is always pressed against the cable 2b by the elastic member 27, the conduction between the shielding layer 2a and the conductor connection part 31 is ensured, and this state can be maintained for a long period of time. .

Moreover, since the outer circumferential surface of the clamp member 3 is insulative, even if an external conducting wire touches the clamp member 3, there will be no short circuit between them. This eliminates the need to particularly consider insulation between the external conducting wire and the clamp member 3.

As a result, it is possible to reduce the number of man-hours required for attaching the cable 2b and for grounding, and to improve the reliability and reliability of the grounding, which is an extremely excellent effect.

In the grounding clamp 1 of the first embodiment, the conductive member 5 may have any structure 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 formed by bending a metal plate into a claw 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 based on FIG. 4, which shows a partially cutaway view of the grounding clamp 51.

The grounding clamp 51 of this embodiment is the same as the grounding clamp 1 of the first embodiment with a pointed protrusion 53 added thereto.

That is, as shown in FIG. 4, an elastic conductive band 55 is disposed on the inner peripheral side of the surrounding portion 7, and a metal pointed protrusion 53 with a sharp tip is provided in the conductive band 55. Multiple locations are placed toward the center.

The grounding clamp 51 described above can ground the cable without removing the insulation layer of the cable. That is, as shown in FIG. 4, in a cable 63 in which a shielded conductor 59 is covered with an insulating sheath 61, by attaching the cable 63 to the mounting plate 65 with the grounding clamp 51 without removing the insulating sheath 61,
The pointed protrusion 53 pierces the insulating sheath 61 and the shielded conductor 5
9, and conduction can be established between the conductor connection portion 31 and the shield conductor 59.

Therefore, according to this embodiment, there is no need to remove the insulating sheath 61 of the cable 63, so the man-hours for grounding work are reduced, damage to the cable 63 is minimized, and the durability of the cable 63 is improved.

Next, a third embodiment will be explained based on FIG.

The perspective view of FIG. 5 shows a grounding clamp 71 for a flat cable (not shown).

The clamp member 73 has legs 77 for attachment to a board, a housing, etc.
79, a clamp portion 85 connected to one end of the base portion 81 via a flexible thin wall portion 83, and a clamp portion 85 provided with a clamp portion 85 erected at the other end of the base portion 81. Clamp latching portion 87 and clamp latching portion 89 that engages with the clamp latching portion 87 provided at the opposite end of the clamp portion 85.
and the base portion 81. A conductive member 93 is attached to the inner periphery of the clamp portion 85.

The conductive member 93 is connected to an external conductor connection fitting 95 disposed from the inner circumference to the outer circumference of the clamp portion 85.
The external conductor connection fitting 95 includes a connection hole 97 formed with a thread for threading the external conductor.

The grounding clamp 71 described above can establish electrical continuity between the conductor exposed to the outside of the flat cable and the external conductor connection fitting 95 by sandwiching the flat cable between the clamp members 73. Further, this conductive state is stably maintained for a long period of time by the elastic force of the conductive member 93. Moreover, since the flat cable is supported by the mounting plate, it is possible to prevent the portion where the flat cable and the conductive member 93 are electrically connected from shifting, and the electrically conductive state can be stably maintained for a long period of time.

In this embodiment, for example, instead of the conductive member 93 shown in FIG. 5, a conductive member 115 formed by bending a metal piece as shown in FIG. 6 may be used. That is, as shown in FIG. 6, a plurality of metal pieces that are bent into claw shapes to be elastically deformed may be arranged on the inner peripheral side of the clamp member 73.

Next, a fourth embodiment will be described based on FIG. 7.

The grounding clamp 121 of this embodiment includes a clamp member 123 that surrounds a cable (not shown), an elastic member 125 that is formed on the inner circumferential side of this clamp member 123 and exhibits an elastic action, and furthermore, this elastic member 125 A conductive member 127 is provided closer to the inner circumferential side.

The clamp member 123 has the same configuration as the clamp member 3 shown in the first embodiment.

Further, the conductive member 127 may be both elastic and conductive, similar to the conductive member 5 of the first embodiment.
It may have one type of conductivity. Note that the connection between the conductive member 127 and the external conductor is made using the clamp member 123.
The clamped member and the conductive member 12 are clamped by
This is done by inserting an external conductor between the two.

The elastic member 125 located between the clamp member 123 and the conductive member 127 includes a plurality of thin plates arranged in a wavy manner.
It is formed integrally with 23. That is, the elastic member 125 utilizes the force of a wavy thin plate to resist deformation.

Further, a plurality of claw-like members 130 are formed on the side edges of the elastic member 125 toward the inner peripheral side of the clamp member 123.

The grounding clamp 121 of this embodiment described above surrounds the cable with the clamp member 123 and is attached to the mounting plate, and the conductive member 127 surrounds the cable. As a result, the conductive member 127 is connected to the elastic member 125.
As a result, the cable is pressed against the cable, and the electrical connection with the conductive parts around the cable is strengthened.

Further, the claw-like member 1 formed on the side edge of the elastic member 125
30 is located at the side end of the conductive member 127,
The conductive member 127 does not protrude beyond the claw-like member 130 and out of the elastic member 125. That is, the conductive member 127 is always located on the upper surface of the elastic member 125 and is pressed against the cable. Therefore, the cable and the conductive member 1
27 is always kept in the best state. Moreover, by further providing an adhesive layer on the surface of the conductive member 127, the mutual positions of the cable, the conductive member 127, and the clamp member 123 are prevented from shifting, and the conductive state is stably maintained for a long period of time.

As a result, this embodiment simplifies the grounding of cables, etc.
It also has excellent effects in that it can be obtained with high reliability.

Note that the height of the peak of the elastic member 125 is determined by the height of the peak of the clamp member 123.
It may be changed depending on the position.

Further, instead of the elastic member 125, the clamp member 123 itself may have elasticity.

Next, a fifth embodiment will be described based on FIG. 8.

The grounding clamp 151 shown in FIG.
3, and a conductive member 155 disposed on the inner peripheral side of this clamp member 153.

A plurality of hook-shaped guide members 159 as shown in FIG. 9 are formed on both side edges 157 of the clamp member 153. As shown in FIG. Further, both base portions 16 of the surrounding portion 161 of the clamp member 153
3, 165 is provided with a conductive member tension member 177 consisting of a hook-shaped tension member 167, 169 and a stop member 175 that connects the tips 171, 173 of both members 167, 169. Both ends 179 and 181 of the conductive member 155 are hooked onto the conductive member tension member 177 and are attached so as not to come off.

The grounding clamp 151 described above has a conductive member 155
The guide member 15
9, and the conductive member 155 has elastic conductive member tension members 17 at both ends 179, 181.
It is pulled by 7. Also, the grounding clamp 151
to enclose the cable (not shown) and attach the mounting plate (
(not shown), the guide member 159 and the conductive member tension member 177 are pushed by the cable and bent toward the outer periphery of the clamp member 153.

Thereby, the guide member 159 is bent according to the size of the cable while preventing the conductive member 155 from separating from the clamp member 153. Moreover, the conductive member tension member 17
7 is a conductive member 15 by being pressed by the cable.
5 in the tensioning direction and press the conductive member 155 against the cable.

Moreover, the hook-shaped tension members 167, 169 flex depending on the cable size, accommodating a wide range of cable thicknesses.

As a result, regardless of the thickness of the cable, the conductive member 15
5 can be pressed onto the cable, increasing the tolerance to the dimensions of the cable.

Next, a sixth embodiment will be described based on FIG. 10.

The grounding clamp 191 shown in FIG.
A conductive member 195 disposed on the inner periphery of the conductive member 193 is composed of a metallic coil spring 197 and a string-like member 199 inserted into the center thereof, and a plurality of points of the string-like member 199 are connected to the clamp member 193. It is glued together.

This allows the grounding clamp 19 to be
1 can be configured.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various embodiments can be implemented without changing the gist of the invention.

For example, as shown in FIG.
, 209 may be configured so that one or both of them extend to the outer circumferential side of the clamp member 203.

[Effects of the Invention] The clamp of the present invention can obtain conduction between the outer periphery of the held member and the conductor connection portion by holding the held member with the clamp member having the conductive member on the inner periphery. Thereby, the held member can be grounded, for example, by connecting the conductor connection portion to the external conductor. Moreover, by disposing the conductor connection portion at the portion where the clamp member is attached to the mounting plate, conduction can be obtained between the member to be held and the mounting plate simply by attaching the clamp member to the mounting plate.

Further, since the clamp member has an insulating layer, there is no electrical conduction between the clamp member and the outside via the clamp member. Thereby, even if the clamp member is attached to the conductive mounting plate, the insulation properties of the held member are maintained. Furthermore, even if the external conductor touches the clamp member, electrical continuity between the external conductor and the held member does not occur.

As a result, according to the present invention, it is possible to simultaneously attach the member to be held to the mounting plate and establish electrical continuity between the member to be held and the conductor connection portion, and to connect the external conductor that is electrically connected to the member to be held to the conductor connection portion. It can be selectively determined depending on the connection state. Moreover, since the conductive member is always urged by the member to be held, conduction can be stably maintained for a long period of time.

Therefore, the installation to the mounting plate and the grounding work can be performed with a small number of man-hours, and high reliability can be obtained, which is an extremely excellent effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the grounding clamp of the first embodiment, FIG. 2 is a sectional view taken along line A-A, FIG. 3 is a perspective view of a modification thereof, and
5 is a perspective view of the third embodiment, FIG. 6 is a perspective view of a modification thereof, FIG. 7 is a perspective view of the fourth embodiment, and FIG. 8 is a perspective view of the fourth embodiment. FIG. 9 is a front view of the fifth embodiment, FIG. 9 is a perspective view of a portion thereof, FIG. 10 is a front view of the sixth embodiment, and FIG.
The figure is a front view of a modified example. 1.51, 71, 121, 151° 191.211... Earth clamp 3.73, 123, 153, 193° 203... Clamp member 5.4 + 93.115, 127° 155.195, 205. ...Conductive member 7.77.16
1...Encircling part 13...Attachment part 25. Length==6... Conductive band 27.125... Elastic member 31... Conductor connection portion 53... Pointed protrusion 95... External conductor connection fitting

Claims (1)

[Scope of Claims] A clamp for supporting a member to be held, such as an electric wire, cable, cord, or piping, on a mounting plate, comprising: a clamp member having at least an insulating layer and supporting the member to be held; The clamp member or the conductive member is configured to be elastically deformable in the radial direction of the clamp member, comprising an electrically conductive member disposed on the inner periphery and a conductor connection portion that connects the conductive member to an outer conductor. A clamp that does.