JP2001352647A - Clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp which assures proper grounding performance and easier operations. SOLUTION: This clamp 1 can easily deform, to hold the cables depending on the diameter thereof at clamping, because a clamp body 10 is formed of a very flexible resin. Moreover, since a conductive member 20 which is placed in contact with a shielding wire of cable, it can be easily deformed at the contact surface with the shield wire, because of its flexibility and can be flexibly in contact with the shield wire. Therefore, a large contact area with the shield wire can be attained, thereby the grounding performance of clamp 1 can be improved. Moreover, since the conductive member 20 is elastically in contact with the shield wire, lateral displacement of the clamping portion generated, when the cable is fixed can be prevented only with a friction force between the conductive member 20 and shield wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp for supporting an electric wire, and more particularly, to a clamp capable of electrically grounding a shield wire provided on the electric wire by being mounted on a mounting plate while supporting the electric wire. .

[0002]

2. Description of the Related Art Conventionally, wires for information, OA equipment, etc.
A shield wire for noise suppression is provided around an insulator through which the core wire is inserted, and the shield wire is further covered with a covering material. An exposed portion of the shield wire is formed at a predetermined position of the covering material in order to release the electric charge charged on the shield wire to the outside, and an earth clamp connected to a mounting plate for grounding is attached to this portion.

The earth clamp is interposed between the shield wire and the mounting plate while supporting the electric wire, and electrically charges the shield wire to the mounting plate to electrically ground the shield wire. Play a role.

[0004]

By the way, most of such conventional earth clamps have a main body made of a metal member in order to maintain a predetermined strength for supporting an electric wire. (Hereinafter, this is also referred to as “metal clamp”).

However, since such a metal clamp has a high rigidity, there is no flexibility in the diameter of a portion surrounding and supporting the electric wire, and the metal clamp cannot tolerate variation in the diameter of the electric wire. Because the contact between the wire and the shield wire is almost in point contact, its grounding ability is low.
Since the interface on the metal clamp side is smooth, the frictional resistance with the shield wire is small, and the clamp position once fixed is easily shifted. Therefore, it is necessary to separately provide a structure for preventing lateral displacement, which causes a problem that the manufacturing becomes complicated and a large deformation force needs to be applied from the outside at the time of clamping. Further, since the end of the metal clamp is usually sharp, there has been a problem that the shield wire is cut off by the end or the operator is easily injured.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a clamp having good grounding performance and easy handling.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, a clamp according to a first aspect of the present invention has a surrounding portion surrounding an electric wire, and extends from both ends of the surrounding portion so as to face each other in substantially the same direction. A clamp body made of a non-conductive resin having a pair of attachment portions attached to a predetermined attachment plate via a fastening member, and a clamp body extending from the inner periphery of the surrounding portion to the opposing surfaces of the pair of attachment portions. Has a belt-shaped main body,
A conductive member made of a conductive resin formed so as to be able to come into contact with the fastening member in at least one of the pair of mounting portions, and formed by fitting the conductive member and the clamp body. And

As described above, in the present clamp, since the clamp body is made of resin, it is more flexible than the above-described metal clamp. For this reason, the clamp body can be easily deformed according to the diameter of the electric wire when the electric wire is clamped, and the electric wire can be gripped. In addition, since it is made of resin, its end is not sharp, and there is no problem such as cutting the electric wire or injuring the operator's finger.

Further, since the conductive member is formed of resin, for example, when a grounding portion is provided on an electric wire and the conductive member is brought into contact with the grounding portion for grounding, the conductive member has a flexibility. It can be easily deformed at the contact surface with the grounding portion, and can flexibly adhere to the grounding portion. For this reason, the contact with the ground portion comes into surface contact, not point contact like a metal clamp, and the contact area can be increased. As a result, the grounding performance of the clamp is improved. In addition, since the conductive member elastically adheres to the ground portion in this way, it is not necessary to provide a conventional lateral displacement prevention structure in the clamp portion when fixing the electric wire, and the conductive member and the ground portion can be connected to each other. The lateral displacement can be prevented only by the frictional force. As a result, the configuration of the clamp is simplified, which leads to improvement in manufacturing efficiency.

[0010] Further, by forming the conductive member from a resin as described above, the weight of the entire clamp can be reduced as compared with a metal clamp, and the flexibility of the clamp makes it possible to reduce the attachment to the electric wire. Easy to do with power. Furthermore, since the conductive member made of a conductive resin is disposed on the facing surface of the mounting portion from the inner periphery of the surrounding portion of the clamp body made of the non-conductive member, that is, on the inner surface of the clamp,
Even if a conductive object comes into contact with the clamp for any reason, this object does not short-circuit with the conductive member and the ground portion. In this case, the ground portion is connected to the ground mounting plate via the conductive resin and the fastening member.

Further, the conductive member and the clamp body may be firmly fitted so that it is difficult to separate them.
As described in claim 2, it is more preferable that they are detachably fitted to each other. In this way, by adopting a configuration in which the conductive member is detachably fitted to the clamp body, for example, even if one of the conductive member or the clamp body has deteriorated with time, one of the conductive member or the clamp body is removed and replaced with a new one. This is convenient. The conductive member and the clamp body are both made of resin. The conductive member is made of a conductive resin, while the clamp body is made of a non-conductive resin. For this reason, it is necessary to separate these when recycling, but according to the above configuration, there is no problem since they can be separated from each other.

As a specific configuration of such a clamp, as described in claim 3, the clamp body is formed by a fitting hole passing through the pair of mounting portions and an inner periphery of the surrounding portion. A pair of cylinders, each of which has a band-shaped fitting groove connected to the mating hole, and the conductive member is inserted into and fitted to each of the fitting holes of the pair of mounting portions at both ends of the band-shaped main body. The one provided with the shape fitting part is conceivable.

In this case, the pair of cylindrical fitting portions of the conductive member are fitted into the fitting holes of the pair of mounting portions, and the band-shaped main body is fitted into the fitting groove. By doing so, it is fixed to the clamp body. In this case, when the fastening member such as a screw, a bolt, a screw, or a rivet is inserted into the pair of cylindrical fitting portions, the elastic member is electrically connected to the mounting plate via the fastening member. It can be configured.

Further, in this case, when the cylindrical fitting portion is fitted in the fitting hole, the cylindrical fitting portion is positioned from a surface opposite to the opposite surface of the mounting plate. It is preferable that the projections are formed at a height that projects a predetermined amount. With this configuration, for example, when a fastening member is inserted into the tubular fitting portion and then fastened, the tubular fitting portion is crushed in the axial direction by its flexibility, and its inner diameter is reduced. Swelling in the direction and the radial direction. Therefore, when the fastening member is fastened, the adhesion between the conductive member and the fastening member is improved, and the conductivity is improved. At the same time, the adhesion between the clamp body and the conductive member becomes better, and these can be stably fixed. Further, when disassembling them, the fastening member is removed, and the protrusion of the tubular fitting portion is pushed in with a finger, so that the disassembly can be performed more easily and quickly.

The conduction between the shield wire and the conductive member is as follows.
For example, this is performed by providing an exposed portion on a part of the covering wire that covers the shield wire, and bringing a conductive member into contact with the shield wire exposed on the exposed portion. Therefore, at this time, if the surface of the conductive member fitted to the clamp body is disposed at the same position as the inner surface of the clamp body, or if it is retracted and disposed inside the fitting groove, the clamp body and Although the conductive member has elasticity, it is difficult to bring the conductive member into contact with the shield wire.

According to a fifth aspect of the present invention, when the conductive member is fitted and mounted on the clamp body, the conductive member protrudes by a predetermined amount from the inner peripheral surface of the surrounding portion and the opposing surface of the mounting portion. It is good to form it. According to this configuration, the protruding surface of the conductive member is securely brought into contact with the shield wire in a pressed state, so that the grounding performance of the clamp can be sufficiently ensured.

[0017] The pair of cylindrical fitting portions may be formed in a similar manner.
As described in the above, each has a stepped shape which becomes smaller in the direction of being mounted on the mounting portion of the clamp body, and the cylindrical portion on the smaller side is fitted and mounted in the fitting hole of the mounting portion. It is preferable to configure as follows.

According to this structure, the larger cylindrical portion of the cylindrical fitting portion is locked to the inner surface of the mounting portion.
This is because the cylindrical fitting portion can be stably fixed at a predetermined position of the fitting hole. Furthermore, if the conductive member is formed so that its width is smaller than the width of the clamp body, a short circuit with an external object is more effectively prevented.

Further, as set forth in claim 8, the conductive member is configured to extend to the center of the clamp body, and the surrounding portion of the clamp body in which the conductive member is disposed as described above,
You may comprise so that it may be formed in a thin-walled shape on both outer sides than the center. With this configuration, a fitting groove having a sufficient depth for fitting the conductive member can be formed at the center of the surrounding portion, while the flexibility of the surrounding portion is further increased by reducing the thickness on both sides. It is possible to reduce the weight of the clamp by reducing the material of this portion.

[0020]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the clamp according to the present embodiment, FIG. 2A is a front view thereof, FIG. 2B is a plan view thereof, and FIG. 2C is a right side view thereof.

As shown in FIG. 1, the clamp 1 comprises a U-shaped clamp body 10 and a U-shaped conductive member 20 removably fitted to the inner peripheral surface of the clamp body 10. Is done. First, the detailed structure of the clamp body 10 will be described with reference to FIGS. FIG.
2A is a sectional view taken along line AA of FIG. 2A, and FIG.
FIG. 3A is a cross-sectional view taken along the line BB, and FIG.
FIG.

The clamp body 10 is made of a non-conductive resin. As shown in FIGS. 2A and 2B, a substantially arc-shaped surrounding portion 11 having a predetermined width, and both ends of the surrounding portion 11 are provided. It is formed from a pair of mounting portions 13 extending from the edge in the same width and substantially in the same direction (horizontal). As the non-conductive resin, for example, synthetic resins such as polyurethane, polyethylene, polypropylene, polyacetal, nylon, and polyester can be used.

The surrounding portion 11 has a shape extending in a tangential direction (horizontal direction) from the lower end thereof so that the lower end surface thereof can abut on a mounting plate described later. In order to be able to adhere, the arc shape continues from the upper end to a position slightly lowered, and has a shape extending in the horizontal direction from there.

Each of the pair of mounting portions 13 has a circular fitting hole 15 penetrating vertically through the center thereof. As shown in FIGS. 3A and 3B, a band-shaped fitting groove 17 is continuously provided from the inner peripheral surface of the surrounding portion 11 to each of the opposing surfaces of both mounting portions 13. Each of both ends of 17 is in communication with each of the pair of fitting holes 15. Also,
As shown in FIG. 2C, the conductive member 2 is inserted into the fitting hole 15.
In order to lock the cylindrical fitting portion (described later) at a predetermined position when it is inserted, a step portion 15a that becomes smaller from the inside to the outside is formed. On the other hand, the fitting groove 17 has a recess 17 a extending from the center thereof over the entire length thereof, and the step formed by the recess 17 a is connected to the step 15 a of the fitting hole 15. ing.

As can be seen from FIGS. 3A and 3B, since the fitting groove 17 is provided in the central portion 11a of the surrounding portion 11, the central portion 11a has the same thickness as the mounting portion 13. However, thin portions 11b are formed on both outer sides of the central portion 11a. Thus, the surrounding portion 11
By making both outer sides thin, the flexibility of the surrounding portion 11 is further enhanced, and the weight of the clamp 1 is reduced by reducing the material of this portion.

Further, in order to prevent stress concentration when an external force (fastening force) is applied to the clamp body 10, a continuous portion between the central portion 11a and the thin portion 11b of the surrounding portion 11 is formed in a tapered shape. As shown in FIG. 3C, the central portion 11 a of the surrounding portion 11, the thin portion 11 b, and the continuous portion of the mounting portion 13 are each provided with a round shape.

Next, the detailed structure of the conductive member 20 will be described with reference to FIG. FIG. 4A shows the conductive member 20.
(B) is a plan view, FIG. (C) is a bottom view, FIG. (D) is a left side view thereof, and FIG. (A) shows a DD cross section, and (e) shows a partial cross-sectional view (corresponding to a right side view) of an EFGH in FIG.

The conductive member 20 is made of a conductive resin, and has a band-shaped main body 21 disposed from the inner peripheral surface of the surrounding portion 11 of the clamp main body 10 to the opposing surfaces of the pair of mounting portions 13. A pair of mounting portions 13 are provided at both ends.
And a pair of cylindrical fitting portions 22 that are respectively inserted and fitted into the respective fitting holes 15.

Here, as the conductive resin, for example, a resin obtained by impregnating a resin material serving as a base with a conductive substance is used. Examples of the resin material include polyurethane, polyamide (PA), ABS resin, polycarbonate (PC
/ ABS), polypropylene (PP), polybutadiene terephthalate (PBT), TPS (styrene-based elastomer), and TPEE (ester-based elastomer). Also, as the conductive substance,
Fine particles of highly conductive metals such as gold, silver, copper, and aluminum, fibers and non-conductive particles such as glass, and fine particles obtained by applying a metal coating to the fibers by plating or vapor deposition to impart conductivity. Examples thereof include fibers, carbon powder, cut carbon fibers, and metal-plated ones, and conductive polymer compounds such as polyaniline, polypyrrole, polyacetylene, and polyacene.

The main body 21 has a shape along the inner peripheral surface of the clamp main body 10 described above, and as shown in FIGS. The contact portion 23 is formed by a pair of conductive portions 24 extending from both end edges in substantially the same direction (horizontally). Each of the contact portion 23 and the conduction portion 24 has substantially the same width as the fitting groove 17 of the clamp body 10. Further, the contact portion 23 and the conduction portion 24
At the center of the outer surface (upper and lower surfaces) of the
5 and 26 are respectively extended over a predetermined length, and these convex portions 25 and 26 are formed in shapes that can be fitted into the concave portions 17 a of the clamp body 10.

On the other hand, the cylindrical fitting portion 22 is
0 has a stepped shape that becomes smaller in the mounting direction with respect to the mounting portion 13, and the cylindrical portion 22 a on the smaller side is the mounting portion 1.
3 is fitted into the fitting hole 15, and the cylindrical portion 22 b on the larger side is locked to the inner surface of the mounting portion 13 on its upper surface, so that the cylindrical fitting portion 22 It is configured to be stably fixed in position. The insertion hole 22c formed inside the pair of cylindrical fitting portions 22 is formed in a size that allows a screw (fastening member) for fixing the clamp 1 to a mounting plate described later to be inserted. .

When the conductive member 20 is fitted and mounted on the clamp body 10, the inner peripheral surface of the contact portion 23 and the opposing surface of the conductive portion 24 form the inner peripheral surface of the surrounding portion 11 of the clamp body 10. The surface is formed to a thickness such that it protrudes by a predetermined amount from the opposite surface of the mounting portion 13 (see FIG. 2A),
The protruding surface of the conductive member 20 is configured to be able to reliably contact in a mode in which the protruding surface is pressed against the shield wire of the electric wire.

In the conductive member 20 configured as described above, the pair of cylindrical fitting portions 22 fit into the fitting holes 15 of the pair of mounting portions 13 of the clamp body 10, and the band-shaped main body 21 further fits. The fitting groove 17 is fixed to the clamp body 10 by being fitted and mounted respectively. Thus, the clamp 1 shown in FIG. 1 is formed. Note that the fixing of the clamp body 10 and the conductive member 20 is described in
In addition to the component assembling method, it is also possible to use an anomalous molding method (so-called two-color injection molding or the like). However, in the latter case, if a material having a low melting temperature is used for the material on the primary side (the clamp body 10 in this case), separation / decomposition is possible, but conversely, the material cannot be separated depending on the material. It is necessary to pay attention to the fact that heat welding may occur.

FIG. 5 is an explanatory view showing a use mode of the clamp 1. As shown in the figure, the clamp 1 configured as described above is screwed to a metal mounting plate 65 via a screw 60 in a state where the electric wire 50 is clamped by the surrounding portion 11.

At this time, an exposed portion 55 for exposing the shield wire 53 is formed at a predetermined portion of the covering material 51 of the electric wire 50, and the conductive member 20 of the clamp 1 is formed at this portion.
Are brought into close contact. Therefore, the electric charge charged on the shield wire 53 passes through the conductive member 20 and the screw 60, and
5, whereby the shield wire 53 is electrically grounded.

As described above, in the above embodiment, since the clamp body 10 is made of a highly flexible resin,
When the electric wire 50 is clamped, the electric wire 50 is easily deformed according to its diameter, and the electric wire 50 can be gripped. In addition, since the end portion is made of resin, the end portion is not sharp, and there is no problem such as injury to the operator's finger.

Further, since the conductive member 20 which is in contact with the shield wire 53 is formed of a resin, it can be easily deformed on the contact surface with the shield wire 53 due to its flexibility. Can be in close contact. Therefore, the contact area with the shield wire 53 can be increased, and the grounding performance of the clamp 1 is improved. Further, since the conductive member 20 elastically adheres to the shield wire 53 in this manner, the lateral displacement of the clamp portion when the electric wire 50 is fixed can be prevented from being shifted from the conductive member 20 to the shield wire 53.
Can be prevented only by the frictional force with the

Further, by forming the entire clamp 1 of resin as described above, the weight of the clamp 1 can be reduced, and the flexibility of the clamp 1 enables the clamp 1 to be easily attached to the electric wire 50 with a small force. Further, the clamp body 10
And the conductive member 20 are detachably fitted to each other, so that it is easy and convenient to separate them during recycling.

Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments, but may take various forms within the technical scope of the present invention. Needless to say. For example, the shapes of the clamp body 10 and the conductive member 20 are not limited to the above-mentioned shapes, but can be appropriately selected for the sake of design. Specifically, in the above-described embodiment, an example in which the width of the conductive member 20 is equal to the width of the fitting groove 17 has been described. However, the conductive member 20 is formed into a shape having a T-shaped cross section and the like. You may make it arrange | position over the whole inner peripheral surface or the opposing surface of the attachment part 13. FIG. However, in the case where the configuration is such that the worker does not touch the conductive member 20 and the shield wire 53 as much as possible, the configuration shown in the above embodiment is considered to be more preferable. In the above embodiment, the cylindrical fitting portion 22
Is a step-like shape that becomes smaller in the direction in which it is mounted on the mounting portion 13, but a shape sandwiching the mounting portion 13, that is,
A configuration may be adopted in which the surface of the mounting portion 13 opposite to the facing surface has a diameter larger than that of the fitting hole 15. With such a shape, the clamp body 10 and the conductive member 20 are more stably fixed. When the conductive member 20 and the clamp body 10 are separated from each other, the tubular fitting portion 20 is easily contracted from the fitting hole 15 by using the flexibility of the tubular fitting portion 20 and contracting the same. Can be pulled out.

In the above embodiment, the clamp 1 is fixed to the mounting plate 65 by screws. However, the clamp 1 may be fixed by bolts, screws, rivets, or other fastening members. For example, it is also possible to adopt a configuration in which another mounting method is adopted, such as a mode in which the first and second mounting members 65 can be fitted together.

[Brief description of the drawings]

FIG. 1 is a perspective view of a clamp according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing details of a structure of a clamp.

FIG. 3 is an explanatory diagram showing details of a clamp structure.

FIG. 4 is an explanatory view showing details of the structure of a conductive member constituting the clamp.

FIG. 5 is an explanatory view showing a use mode of the clamp.

[Explanation of symbols]

1 ... clamp, 10 ... clamp body, 11 ・
..Surrounding part, 11a: central part, 11b: thin part, 13: mounting part, 15: fitting hole, 1
5a: stepped portion, 17: fitting groove, 17a:
Recess, 20: conductive member, 21: body, 22
... Cylindrical fitting part, 22a ... Cylindrical part, 22b ...
· Cylindrical part, 22c · · · insertion hole, 23 · · · contact part, 24 · · · conductive part, 25 · · · convex part, 50 · · ·
・ Electric wire, 51 ・ ・ ・ Coating material, 53 ・ ・ ・ Shield wire,
55 ... hole, 60 ... screw, 65 ... mounting plate

Claims (8)

[Claims] An enclosure surrounding the electric wire, and a pair of attachment parts extending from both ends of the enclosure in opposite directions in substantially the same direction and attached to a predetermined attachment plate via a fastening member,
A clamp body made of a non-conductive resin having: a band-shaped body disposed from the inner periphery of the surrounding portion to each of the opposing surfaces of the pair of mounting portions; and at least one of the pair of mounting portions A conductive member made of a conductive resin formed so as to be able to abut on the fastening member; and a clamp formed by fitting the conductive member and the clamp body. 2. The method according to claim 1, wherein the conductive member and the clamp body are
The clamp according to claim 1, wherein the clamps are formed so as to be separable from each other. 3. The clamp body extends from a fitting hole penetrating the pair of mounting portions and an inner periphery of the surrounding portion to opposing surfaces of the pair of mounting portions, and communicates with the fitting hole. The conductive member has a pair of tubular fitting portions at both ends of the belt-shaped main body, through which the fastening member can be inserted, and the pair of tubular fitting portions. Are fitted in the fitting holes of each of the pair of attachment portions, and the band-shaped body is fitted in the fitting groove, thereby being formed so as to be fixed to the clamp body. The clamp according to claim 1 or 2, wherein 4. The cylindrical fitting portion is formed at a height protruding a predetermined amount from a surface of the mounting plate opposite to the facing surface when the cylindrical fitting portion is fitted into the fitting hole. The clamp according to claim 3, wherein: 5. The electronic device according to claim 1, wherein the conductive member has a thickness that protrudes by a predetermined amount from an inner peripheral surface of the surrounding portion and a facing surface of the mounting portion when the conductive member is fitted to the clamp body. The clamp according to any one of claims 1 to 4. 6. The cylindrical fitting portion has a stepped shape that becomes smaller in a direction in which the cylindrical fitting portion is mounted on the mounting portion, and is formed such that the cylindrical portion on the smaller side is fitted in the fitting hole. The clamp according to any one of claims 3 to 5, wherein the clamp is provided. 7. The clamp according to claim 1, wherein the width of the conductive member is smaller than the width of the clamp body. 8. The apparatus according to claim 1, wherein the conductive member extends in the center of the clamp body, and the surrounding portion is formed in a thin shape on both outer sides of the center where the conductive member is provided. The clamp according to any one of claims 1 to 7, wherein