US 7,348,490 B2
Double wire cord and portable audio device using the same
Kiyotaka Sakai, Tokyo (Japan)
Assigned to SDK Company, Tokyo (Japan)
Filed on Dec. 06, 2006, as Appl. No. 11/635,340.
Claims priority of application No. 2006-150109 (JP), filed on May 30, 2006.
Prior Publication US 2007/0277995 A1, Dec. 06, 2007
Int. Cl. H01B 11/02 (2006.01)
U.S. Cl. 174—113R  [174/115] 5 Claims
OG exemplary drawing
 
1. A double wire cord, comprising:
a first cord that has a long first conductor, a first insulator coating said first conductor, a fitting groove having a recessed cross section formed in a side surface of said first insulator along the length of said first insulator, and elastic engaging parts formed on parts of said fitting groove; and
a second cord that has a long second conductor and a second insulator that coats said second conductor and is detachably fitted into said fitting groove and locked by said engaging parts, the diameter of the cross section of the second cord being smaller than the diameter of the cross section of said fitting groove.