JP2005312143A - Fixing structure of flat cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a flat cable which does not need a fixing member for fixing the flat cable to a member to be fixed. <P>SOLUTION: The fixing structure of the flat cable fixes the flat cable 1 to the cable fixing part 7 of the member 6 to be fixed. The flat cable 1 has a plurality of core wires 4 applied with an insulating coating 3 on a conductor 2 and arranged in parallel in the same plane and adjacent core wires 4 integrally coupled through a bridge 5 formed of an insulator. The bridge 5 is deposited to the upper surface 7a of the cable fixing part 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flat cable fixing structure for fixing, to a cable fixing portion, a flat cable in which a plurality of core wire portions arranged in parallel are integrally connected via a bridge portion.

  Conventionally, a plurality of core wire portions each having an insulation coating on a conductor are arranged in parallel on the same plane, and the adjacent core wire portions are integrally connected via a bridge portion formed of an insulating material. Cable is known.

When fixing such a flat cable as a wire harness, for example, to a fixed member such as a bumper, an instrument panel, or a door interior panel of a vehicle, a fixing structure for fixing using a fixing member such as a clamp is known. (For example, refer to Patent Document 1).
JP 2001-251742 A

  However, in the flat cable fixing structure using such a fixing member, a fixing member such as a clamp is required, which increases the cost. In addition, a separate process for attaching the fixing member to the flat cable is required, which may cause a problem in workability of the flat cable fixing work.

  The objective of this invention is providing the fixing structure of the flat cable which does not require the fixing member for fixing a flat cable to a to-be-fixed member.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a plurality of core wire portions formed by providing an insulating coating on a conductor are arranged in parallel on the same plane, and the adjacent core wire portions are formed of an insulating material. A flat cable fixing structure for fixing a flat cable integrally connected to the fixed member via the bridge portion, wherein the bridge portion is welded to the fixed member.

  In the invention according to the first aspect, the flat cable is fixed to the fixed member by welding the bridge portion to the fixed member.

  The invention according to claim 2 is characterized in that welding of the bridge portion to the fixed member according to claim 1 is ultrasonic welding.

  In the invention according to the second aspect, the bridge portion is ultrasonically welded to the fixed member, and the flat cable is fixed.

  According to a third aspect of the present invention, the welding surface of the fixed member for welding the bridge portion according to the first or second aspect is formed by roughening.

  In the invention according to the third aspect, the bridge portion is welded to the welding surface of the fixed member formed by the roughening.

  According to a fourth aspect of the present invention, a protrusion for welding the bridge portion is formed on the fixed member according to the first, second, or third aspect.

  In the invention according to the fourth aspect, the bridge portion is welded to the tip portion of the protrusion.

According to the first aspect of the present invention, the flat cable can be fixed to the fixed member without using a fixing member such as a clamp. Therefore, the number of parts can be reduced, whereby cost reduction and workability can be improved, and a simplified fixing structure can be obtained.
Furthermore, since the bridge portion is welded, the core wire portion is not damaged.

  According to the second aspect of the invention, since the welding to the bridge portion to the fixed member is performed by ultrasonic welding, the thermal load applied to the core wire portion and the fixed member can be reduced.

  According to invention of Claim 3, since the welding surface which welds a bridge | bridging part is roughened, it can weld firmly.

  According to invention of Claim 4, since a bridge part is welded to the said protrusion, it is easy to weld.

Hereinafter, an example of the best mode for carrying out the present invention will be described with reference to the drawings.
1 is a perspective view showing a flat cable, FIG. 2 is a view showing a state in which the flat cable shown in FIG. 1 is fixed to a bumper, and FIG. 3 is a view before fixing the flat cable to the cable fixing portion of the bumper shown in FIG. FIG. 4 is an enlarged view showing a state in which the flat cable is fixed from the state shown in FIG.

  In the figure, a flat cable denoted by reference numeral 1 has a plurality of core wires 4 having a circular cross section formed by applying an insulating coating 3 on a conductor 2 (four in this example) arranged in parallel on the same plane and adjacent to each other. The core wire portion 4 is integrally connected via a bridge portion 5 (5a, 5b, 5c) formed integrally with the insulating coating 3.

  The insulating coating 3 and the bridge portion 5 are both formed of an insulating material made of a thermoplastic resin such as polyvinyl chloride and polyolefin, and are integrally formed by extrusion coating on the conductor 2.

  Next, a structure for fixing the flat cable 1 thus configured to the member to be fixed will be described with reference to FIGS. The fixed member will be described by taking an automobile bumper as an example.

  In the figure, reference numeral 6 denotes a resin bumper to which the flat cable 1 is fixed. The flat cable 1 is fixed to a cable fixing portion 7 made of thermoplastic resin formed integrally with the bumper 6. .

  Four cable fixing portions 7 are formed on the back surface of the bumper 6 in this example, and are formed as a rectangular parallelepiped fixing base protruding from the back surface of the bumper 6. The cable fixing part 7 is preferably formed of the same material as the bridge part 5. And the upper surface 7a (refer FIG. 3, FIG. 4) of this cable fixing | fixed part 7 comprises the welding surface for welding the flat cable 1, and the flat cable 1 exceeds the upper surface 7a as this welding surface. Sonic welded.

  The flat cable 1 is fixed to the cable fixing portion 7 as follows. That is, first, as shown in FIG. 3, the flat cable 1 is placed on the upper surface 7 a of the cable fixing portion 7. Next, the bridge portion 5 of the flat cable 1 is ultrasonically welded to the upper surface 7a of the cable fixing portion 7 by an ultrasonic horn 8 of an ultrasonic welding device (not shown). In the illustrated example, the bridge portions 5 to be ultrasonically welded are two bridge portions 5a and 5c. Of course, the central bridge portion 5b may also be ultrasonically welded. Further, ultrasonic welding may be performed in a spot manner or continuously in the cable longitudinal direction.

  As shown in FIG. 4, the bridge portions 5 a and 5 c are in a state where the ultrasonic welded portion on the upper surface 7 a of the cable fixing portion 7 is bent toward the cable fixing portion 7, and the bumper 6 is flat in the welded portion. The cable 1 is fixed.

  According to the flat cable fixing structure of this example as described above, the flat cable 1 can be fixed to the bumper 6 as a member to be fixed without using a fixing member such as a clamp. Therefore, the number of parts can be reduced, thereby reducing costs and improving workability, and obtaining a simplified fixing structure.

  Further, since the bridge portion 5 is ultrasonically welded, the core wire portion 4 is not damaged. Moreover, the thermal load concerning the core wire part 4 and the cable fixing | fixed part 7 can be decreased by making the welding method into ultrasonic welding.

  In addition, you may form the upper surface 7a of the said cable fixing | fixed part 7 used as the welding surface for welding the bridge part 5 by roughening as shown to FIG. 5 (A). By ultrasonically welding the bridge portion 5 of the flat cable 1 to the upper surface 7a of the cable fixing portion 7 thus roughened, a stronger welding can be achieved and the flat cable 1 can be firmly fixed to the bumper 6. Can do.

  Further, as shown in FIG. 5B, protrusions 9 and 9 for ultrasonically welding the bridge portion 5 may be formed on the upper surface 7a of the cable fixing portion 7. If the bridge portions 5a and 5c of the flat cable 1 are ultrasonically welded to the tip portions of the projections 9 and 9, respectively, the welding is facilitated.

  In the above embodiment, the bridge portion 5 is ultrasonically welded to the cable fixing portion 7. However, the present invention is not limited to ultrasonic welding, but a welding method other than ultrasonic welding (for example, heat, Any material that can be welded by resistance, laser welding, or the like) may be used.

The perspective view which shows a flat cable. The figure which shows the state by which the flat cable shown in FIG. 1 is being fixed to the bumper. The enlarged view which shows the state before fixing a flat cable to the cable fixing part of the bumper shown in FIG. The enlarged view which shows the state which fixed the flat cable from the state shown in FIG. The figure which shows the modification of a cable fixing | fixed part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat cable 2 Conductor 3 Insulation coating 4 Core wire part 5 Bridge part 6 Bumper 7 Cable fixing part 7a Upper surface 8 Ultrasonic horn 9 Protrusion

Claims (4)

Covering a flat cable in which a plurality of core wire portions each having an insulation coating on a conductor are arranged in parallel on the same plane, and the adjacent core wire portions are integrally connected via a bridge portion formed of an insulating material. A flat cable fixing structure for fixing to a fixing member,
A flat cable fixing structure, wherein the bridge portion is welded to the fixed member.   The flat cable fixing structure according to claim 1, wherein welding of the bridge portion to the fixed member is ultrasonic welding.   The flat cable fixing structure according to claim 1, wherein a welding surface of the fixed member for welding the bridge portion is formed by roughening.   The flat cable fixing structure according to claim 1, wherein a protrusion for welding the bridge portion is formed on the fixed member.

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