Cable take-up for earphones

Details Cable take-up for earphones Cable take-up for earphones

1994-01-18

1995-06-06

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

381187, 439501, H04R 2500

Patent

active

054229570

ABSTRACT:
A cable take-up includes a cylindrical case and a plug mechanically attached to the case and extending axially from the case. Within the case, a cable is wound onto a rotating spool biased by a spring to retract the cable. A ratchet prevents the cable from retracting and a release for the ratchet is accessible from outside of the case. The cable preferably is a flat ribbon of Kevlar.RTM. plastic having several wires embedded therein. One end of the cable is connected to earpieces and the other end of the cable is connected to the plug through a commutator. The commutator includes a first disk having resilient, conductive contacts attached to the plug and a second, rotating disk having concentric, conductive stripes attached to the cable and rubbing on the conductive contacts.

REFERENCES:
patent: 2172043 (1939-09-01), Wolf
patent: 4942617 (1990-07-01), Boylan
patent: 4989805 (1991-02-01), Burke
patent: 5236371 (1993-08-01), Matthis
patent: 5339461 (1994-08-01), Luplow

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