JP6404060B2 - cable clamp - Google Patents

Description

  The present invention relates to a cable clamp for fixing and supporting a cable to a chassis or panel of a device.

  As a cable clamp for fixing and supporting a cable to a chassis or panel (hereinafter, represented by a chassis) of a device, a cable clamp processed with a metal plate as described in Patent Document 1 has been proposed. This cable clamp is also called a shield clamp or a grounding clamp, and is used to electrically connect to the chassis in a state of being electrically connected to the shield jacket of the shield cable and to ground the shield jacket.

  For example, in the example shown in FIG. 1A, a normal cable 41 is covered with a shield tube 42 and configured as a shield cable 4. The shield tube 42 is composed of a flexible metal or a spiral tube having a conductive surface, and the cable 41 is inserted through the shield tube 42. The shield cable 4 is inserted into the loop-shaped clamp portion 11 of the cable clamp 1B, and the plate-like fixed sheet portions 12a and 12b extending from both ends of the clamp portion 11 are stacked on the chassis 3. By fixing with the screw 2, the shield cable 4 is clamped at the clamp portion 11 and fixedly supported to the chassis 3. At the same time, the cable clamp 1 </ b> B is electrically connected to the shield tube 42, thereby electrically connecting the shield cable 4 to the chassis 3. And grounding.

Japanese Utility Model Publication No. 6-31183

  In this cable clamp 1B, when an external force is applied to the cable 4, the external force reaches the cable clamp 1B. When the external force exceeds the fastening force of the screw 2, the cable clamp 1B is connected to the chassis 3 as shown by an arrow. Is rotated around the screw 2 on the surface. Therefore, the fastening state by the screw 2 is loosened, the fixing support of the shield cable 4 to the chassis 3 is impaired, and the shield cable 4 cannot be stably supported on the chassis 3. Further, such rotation of the cable clamp 1B reduces or damages the electrical continuity between the cable clamp 1B and the chassis 3, and reduces the grounding state of the shielded cable 4 by the cable clamp 1B.

  An object of the present invention is to provide a cable clamp capable of stably fixing and supporting a cable with respect to a chassis. Another object of the present invention is to provide a cable clamp that ensures the grounding of the shield jacket with respect to the chassis.

In the present invention, a strip-shaped plate material is bent in the length direction, a clamp portion that is formed in a part thereof and holds the cable, and is extended in a plate shape in the length direction from an end portion of the clamp portion. A cable clamp having a fixed sheet portion fixed to a chassis or the like of a device, wherein the fixed sheet portion has a plurality of abutting surfaces of the chassis at both edges in the width direction perpendicular to the length direction thereof. comprises a number of nail body, the claw each corner characterized that you have been formed as a protrusion that protrudes outward in the width direction. Preferably, the fixed sheet portion is configured as at least a pair of fixed sheet portions continuous to both ends of the clamp portion, and the fixed sheet portions forming these pairs are fixed to the chassis in a state of being stacked in the thickness direction, A nail | claw body is formed in at least one of the fixed sheet | seat part which makes these pairs.

In the present invention, the inner surface of the clamp portion facing the outer jacket of the cable has a plurality of protrusions protruding toward the radial direction of the cable to be clamped, and the plurality of protrusions are arranged in the radial direction of the cable. It is preferable that the protrusion provided on one side and the protrusion provided on the other side in the radial direction are arranged at different positions in the length direction of the cable.

According to the cable clamp of the present invention, when the cable is clamped and fixed to the chassis, the claw body of the fixed sheet portion bites into the surface of the chassis, thereby preventing the cable clamp from being rotated by an external force, The cable can be stably fixed and supported. In particular, the claw bodies at both edges of the fixed sheet portion have their respective corners protruding outward in the width direction, so that the cable clamp can be prevented from rotating in any direction. Also, when the shield cable is clamped, the claws break through the insulation film on the surface of the chassis and make electrical contact with the internal conductor of the chassis, increasing the electrical continuity between the cable clamp and the chassis and improving the grounding characteristics of the shield cable. Can be improved.

  In addition, according to the present invention, the protrusion on the inner surface of the clamp portion strongly contacts the cable jacket, so that the holding force of the cable can be increased and the cable can be clamped firmly, and the cable can be moved in the longitudinal direction or around the axis. Directional movement can be prevented. At the same time, the electrical conductivity between the shield cable and the cable clamp can be enhanced by the protrusion on the inner surface of the clamp portion.

The outline appearance perspective view of the use state of the conventional cable clamp and the cable clamp of the present invention. The external appearance perspective view of the cable clamp of this invention. The front view which fractured | ruptured a part of cable clamp of this invention, and each sectional drawing of a BB line and CC line. The typical sectional view showing the clamped state in a clamp part. Sectional drawing of the state which fixed the cable clamp to the chassis, and the enlarged view of the part. The external appearance perspective view of the cable clamp of a different form.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is an external perspective view of the cable clamp 1 of the present invention. 3A is a partially cutaway front view, FIG. 3B is a sectional view taken along the line BB, and FIG. 3C is a sectional view taken along the line CC. 2 and 3, the cable clamp 1 is formed of a flexible metal plate having a strip shape, and a clamp portion 11 in which a central region in the length direction is bent into a substantially circular loop shape, The clamp portion 11 includes fixed sheet portions 12a and 12b that form a pair of flat plates that are extended at both ends in the length direction. By overlapping the fixed sheet portions 12a and 12b so that the opposing surfaces of the paired fixed sheet portions 12a and 12b are in contact with each other, both ends of the clamp portion 11 are brought close to each other so that the clamp portion 11 becomes substantially cylindrical. The cable is deformed, and the cable can be clamped (held) inside the clamp portion.

  The clamp portion 11 has a hole 13 having a shape close to a slit having a major axis in the width direction at a part in the circumferential direction, here, at a substantially intermediate position in the circumferential direction. By providing the hole 13, the clamp part 11 is easily deformed in the thickness direction at the opening portion of the hole 13, and the cable clamp is easily deformed when the cable is clamped.

  In addition, on the inner peripheral surface of the clamp portion 11, inwardly protruding portions 14, 15, and 16 that are protruded toward the inner diameter direction are formed at positions that oppose each other in the radial direction. Here, the inward protrusions 14, 15, and 16 are formed by stamping a part of the metal plate constituting the clamp part 11 so as to protrude from the outer surface side toward the inner surface side. These inward protrusions 14, 15, and 16 are formed as elongated protrusions having a dimension in the length direction larger than the width direction of the cable clamp. In addition, one inward protrusion 14 located on the upper side in FIG. 2 is formed as one protrusion disposed at the center in the width direction of the cable clamp, and is located on the lower side in FIG. The two inner projecting portions 15 and 16 are formed at positions sandwiching the upper inner projecting portion 14 in the width direction.

  The fixed sheet portions 12a and 12b forming the pair are respectively opened with screw insertion holes 17 and 18 that communicate with each other in the plate thickness direction when the two fixed sheet portions 12a and 12b are stacked in the plate thickness direction. The cable clamp 1 can be fixed to the surface of the chassis 3 by screwing the screws 2 that pass through the insertion holes 17 and 18 into the chassis 3 of the device.

  One of the pair of fixed sheet portions 12a and 12b, here, the lower fixed sheet portion 12b in FIG. 2, that is, the side that comes into contact with the surface of the chassis 3 when the cable clamp 1 is fixed to the chassis 3 with screws 2. In the fixed sheet portion 12b, a plurality of claw bodies 19 are integrally formed at both edges in the width direction. In this embodiment, three nail bodies 19 are formed on both edges. These claw bodies 19 are configured as projecting pieces having a triangular planar shape, and one corner portion projects toward the outside in the width direction of the fixed sheet portion 12b as a tip portion, and the tip portion is a fixed sheet. It is inclined toward the outer surface direction facing the lower side of the portion 12b, and the tip end portion is positioned to protrude from the outer surface of the fixed sheet portion 12b.

  Of the three claw bodies 19, at least one claw body 19 is disposed in a region between the screw insertion hole 18 and the clamp portion 11 when viewed in the length direction of the cable clamp 1. . In this embodiment, of the three claw bodies 19, the two claw bodies 19 on the clamp part side 11 are arranged in a region sandwiched between the screw insertion hole 18 and the clamp part 11.

  According to the cable clamp 1 configured as described above, as shown in FIG. 1B, when the shield cable 4 is fixed to the chassis 3, first, the shield cable 4 is passed between the two fixing sheet portions 12a and 12b. Is inserted into the clamp part 11. Alternatively, the inside of the clamp portion 11 is inserted from the end portion of the shielded cable 4. This shielded cable 4 has a configuration in which a cable 41 is surrounded by a shield tube 42 as shown in FIG. Then, the cable clamp 1 is fixed to the surface of the chassis 3 with screws 2. At this time, the lower fixed sheet portion 12 b on which the claw body 19 is provided is in a state of facing the surface of the chassis 3. The screws 2 are inserted into the screw insertion holes 17 and 18 of both the fixing sheet portions 12a and 12b and screwed into screw holes provided in the chassis 3 or screwed into nuts on the back side of the chassis 3 to both. The fixing sheet portions 12a and 12b are fixed to the surface of the chassis 3 in a stacked state.

  At the time of fixing, the clamp sheet 11 is reduced in loop diameter by overlapping the fixed sheet parts 12a and 12b in contact with each other, and the inner peripheral surface of the clamp part 11 is the outer peripheral surface of the shield cable 4, that is, the shield. The cable 4 is clamped in contact with the outer peripheral surface of the tube 42. At this time, as shown in a schematic sectional view in the core direction of the shielded cable 4 in FIG. 4, the inner protrusions 14, 15, 16 on the inner surface of the clamp portion 11 are in the radial direction with respect to the outer peripheral surface of the shield tube 42. The inner projecting portions 14, 15, and 16 that are opposed to each other press the outer peripheral surface of the shield tube 42 at different positions in the length direction of the shield tube 42. The shield cable 4 is firmly held by the portions 14, 15, and 16 in a meandering state, and the shield cable 4 is prevented from dropping from the clamp portion 11 in the length direction. Moreover, since each inner protrusion 14,15,16 is radially deformed against the outer peripheral surface of the shield tube 42, the electrical contact between the inner protrusion 14,15,16 and the shield tube 42 is improved, and the shield The continuity between the cable 4 and the cable clamp 1 is also improved.

  Further, when both the fixing sheet portions 12a and 12b are fixed to the chassis 3, the both fixing sheet portions 12a and 12b are fixed to the surface of the chassis 3 in a pressed state by the fastening force of the screws 2, as shown in the sectional view of FIG. Is done. In particular, the outer surface of the lower fixed sheet portion 12b that is in direct contact with the surface is brought into close contact with the surface of the chassis 3, and at the same time, the claw body 19 is brought into contact with the surface of the chassis 3 by the fastening force. The Since the claw body 19 has a pointed tip, the fastening portion causes the tip to bite into the surface of the chassis 3. As a result, even when an external force is applied to the shielded cable 4 or the cable clamp 1 and the cable clamp 1 is rotated around the screw 2 on the surface of the chassis 3, the tip of the claw body 19 and the chassis 3 The rotation of the cable clamp 1 is locked by the bite engagement with the surface of the cable.

  In the locking of the rotation of the cable clamp 1 by the claw body 19, the rotation in the direction opposite to the protruding direction of the claw body 19 is locked. Since the claw body 19 protrudes outward at both edges in the width direction of the fixed sheet portion 12b, the cable clamp 1 is in either the clockwise direction or the counterclockwise direction around the screw 2. The rotation is also locked. In addition to this, since at least a part of the claw body 19 is disposed in a region that is biased toward the clamp portion 11 with respect to the screw 2, the rotational force acts on the cable clamp 1 by an external force applied to the shield cable 4. Even so, the turning force is received by the claw body 19 at a position close to the clamp portion 11, and the moment when the rotation is locked increases, so that the rotation can be locked effectively. Become.

  At the same time, when the cable clamp 1 is fixed to the chassis 3, the tip of the claw 19 bites into the surface of the chassis 3, so that an oxide film or paint is applied to the surface of the chassis 3 as shown in the enlarged view of FIG. 5. Even when the insulating coating 31 such as a coating is formed, the tip of the claw body 19 penetrates through the insulating coating 31 and reaches the inner conductor portion of the chassis 3 to obtain electrical continuity between the chassis 3 and the cable clamp 1. be able to.

  Thus, according to the cable clamp 1 of this embodiment, even if the shield cable 4 is clamped and fixed to the chassis 3 with the screws 2, the claw body 19 of the fixed sheet portion 12b bites into the surface of the chassis 3. The cable clamp 1 can be prevented from being rotated by an external force, and the shielded cable 4 can be stably fixed and supported. Further, the inner protrusions 14, 15, 16 on the inner surface of the clamp portion 11 press and deform the outer peripheral surface of the shield tube 42 in the radial direction, whereby the shield cable 4 can be firmly clamped, and the length direction of the shield cable 4 And movement around the wire core can be prevented.

  Furthermore, the electrical continuity between the shield tube 42 and the cable clamp 1 can be enhanced by the inward protrusions 14, 15, 16 on the inner surface of the clamp portion 11. Even when the surface of the chassis 3 is insulated, the claw body 19 breaks through the insulating coating 31 and is electrically contacted with the internal conductor of the chassis 3, so that the electrical continuity between the cable clamp 1 and the chassis 3 is improved. The grounding characteristics of the shield jacket can be improved.

  The cable clamp of the present invention may be provided with a claw body on the other fixed sheet portion 12a that is on the upper side when fixed to the chassis. For example, as shown in an external perspective view of the cable clamp 1A in FIG. 6, a gap d where the claw body 19 does not exist is formed on one side in the length direction of the claw body 19 formed on the lower fixed sheet portion 12b. The upper fixed sheet portion 12a is provided with a claw body 19A at a position facing the gap d. In this case, the claw body 19A of the upper fixed sheet portion 12a has a dimension that allows the tip portion to protrude to the outer surface side facing the lower side of the lower fixed sheet portion 12b. Note that, in the cable clamp 1A, the same reference numerals are given to the portions equivalent to the cable clamp 1 described above, and the description thereof is omitted.

  In the cable clamp 1 </ b> A having this configuration, although not shown, when the cable clamp 1 </ b> A is fixed to the chassis, the claw bodies 19 and 19 </ b> A of the respective fixing sheet portions 12 a and 12 b are in a state of biting into the surface of the chassis 3. As a result, the cable clamp 1A receives the turning force due to the external force applied to the cable clamp 1A in each of the claw bodies 19, 19A, in other words, both the fixed sheet portions 12a, 12b, and can more reliably lock the rotation. it can. Further, since the fixed sheet portion 12a is directly electrically connected to the chassis 3 via the claw body 19A, the grounding characteristic of the shielded cable by the cable clamp 1A is further enhanced.

  Or although illustration is abbreviate | omitted, you may make it provide a nail | claw body only in an upper fixed sheet | seat part. In this way, since the rotational force due to the external force applied to the cable is received by the upper fixed sheet portion, the upper fixed sheet portion is prevented from being deformed by the rotational force with respect to the lower fixed sheet portion. This is effective in ensuring electrical conduction due to the close contact between both fixed sheet portions.

  If the nail | claw body concerning this invention is the structure which the front-end | tip part can bite into the surface of a chassis when it contact | abuts to a chassis, it will not be restricted to the triangular shape as described in embodiment. In addition, it is preferable to provide the claw body on both sides of the fixed sheet portion. However, when the rotational force applied to the cable clamp is limited to one direction, it may be provided on at least one side of the fixed sheet portion. It is sufficient that there is at least one in each fixed sheet portion, and the number is not limited to the number described in the embodiment.

  In the embodiment described above, the fixing sheet portions are provided so as to form a pair at both ends of the clamp portion, and the fixing sheet portions forming these pairs are fixed to the chassis in a state of being stacked in the plate thickness direction. However, it is possible to lock the rotation of the cable clamp by forming a nail on the fixed sheet part even with a cable clamp with a fixed sheet part provided only at one end of the clamp part. It is.

  The present invention can be applied to a cable clamp formed of a conductive material such as metal.

DESCRIPTION OF SYMBOLS 1 1A Cable clamp 2 Screw 3 Chassis 4 Shield cable 11 Clamp part 12a, 12b Fixing sheet part 13 Hole 14,15,16 Inward protrusion part 17,18 Screw insertion hole 19,19A Claw body 31 Insulating film 41 Cable 42 Shield tube

Claims (4)

A strip-shaped plate material is bent in the length direction, formed in a part thereof to hold the cable, a clamp portion extending from the end of the clamp portion in the length direction into a flat plate shape, etc. A cable clamp having a fixed sheet portion fixed to a plurality of claws that are respectively brought into contact with the surface of the chassis at both edges in the width direction perpendicular to the length direction. provided by which, the claw cable clamps each corner portion is characterized that you have been formed as a protrusion that protrudes outward in the width direction.   The fixed sheet portion is configured as at least a pair of fixed sheet portions continuous to both ends of the clamp portion, and the fixed sheet portions forming the pair are fixed to the chassis in a state of being stacked in the thickness direction, and the claw 2. The cable clamp according to claim 1, wherein the body is formed on at least one of the fixed sheet portions forming the pair.   The fixing sheet portion has a hole for fixing to the chassis, and at least one of the claw members is disposed in a region sandwiched between the hole and the clamp portion. The cable clamp according to 1 or 2. The inner surface of the clamp portion facing the outer jacket of the cable has a plurality of protrusions protruding in the radial direction of the cable to be clamped, and the plurality of protrusions are on one side in the radial direction of the cable The protrusion provided on the other side and the protrusion provided on the other side in the radial direction are disposed at different positions in the length direction of the cable. Cable clamp as described.

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