# US 2012/0312651 A1 · Rewindable Electrical Cable Extension Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0312651 A1 - Document ID: US20120312651A1 - Status: Published application - Kind: A1 - Application number: 13/459,990 - Filed: 2012-04-30 - Published: 2012-12-13 - Earliest claimed: 2011-06-13 - Assignees: Kramer Electronics Ltd. - Inventors: Joseph Kramer; Felix Roif - Web page: https://patentgrep.com/patent/US20120312651A1 ## CPC - H02G 11/02: using take-up reel or drum - B65H 75/4434: {actuated by pulling on or imparting an inclination to the material} - B65H 75/4449: {Arrangements or adaptations to avoid movable contacts or rotary couplings, e.g. by the use of an expansion chamber for a lenght of the cord or hose} - B65H 2701/34: electric cords or electric power cables - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES ## Abstract A rewindable electrical cable extension device includes a housing having first and second exit ports, and a cable having first and second ends defining opposing extremities of first and second contiguous cable sections having a common junction anchored to a rotating spool. The first end protrudes through the first exit port, and the second end is fixedly mounted in association with the second exit port. The first cable section is wound on a spool that is configured to rotate within the housing. The second cable section is wound in an opposite direction to the first section so that pulling on the first end unwinds and extracts the first cable section from the housing and uncoils the second cable section within the housing without rotating the second end of the cable. ## Claims ### Claim 1 A rewindable electrical cable extension device for coupling between first and second connectors, the device comprising: a housing having first and second cable exit ports, a cable having a first end and a second end defining opposing extremities of first and second contiguous sections of the cable, the first end of the cable protruding through the first exit port and being configured for connection to the first connector, the second end of the cable being fixedly mounted in association with the second exit port and being configured for connection to the second connector, and the first section of the cable being wound in a first direction on a rotating spool that is configured to rotate within the housing, a common junction of the first and second sections of the cable being anchored to the rotating spool, and the second section of the cable being wound in an opposite direction to the first section so that unwinding the cable by pulling on the first end extracts the first section of the cable from the housing and uncoils the second section within the housing without rotating the second end of the cable. ### Claim 2 (depends on 1) The device according to claim 1, wherein the second section of the cable is coiled on a non-rotating spool. ### Claim 3 (depends on 1) The device according to claim 1, wherein the second section of the cable is coiled inside a non-rotating drum. ### Claim 4 (depends on 2) The device according to claim 2, wherein the cable passes through a peripheral slot in the non-rotating spool or drum which separates the first section of the cable from the second end thereof. ### Claim 5 (depends on 4) The device according to claim 4, wherein the peripheral slot serves to anchor the common junction between the first and second sections of the cable. ### Claim 6 (depends on 2) The device according to claim 2, further comprising a take-up spool mounted on an exterior surface of the housing for taking up any surplus in the second section of the cable protruding through the second exit port. ### Claim 7 (depends on 1) The device according to claim 1, wherein the rotating spool comprises: a first surface having a radial channel for accommodating the cable therein, and an opening abutting the radial channel for allowing the cable to be folded through the opening to a second surface of the rotating spool. ### Claim 8 (depends on 7) The device according to claim 7, wherein the rotating spool comprises a bobbin on the second surface for winding the first section of the cable thereon. ### Claim 9 (depends on 8) The device according to claim 8, wherein the bobbin comprises a circular disc coaxially mounted on a cylindrical hub. ### Claim 10 (depends on 1) The device according to claim 1, further including a spring-loaded clutch for rewinding the first section of the cable on to the rotating spool. ### Claim 11 (depends on 10) The device according to claim 10, wherein the spring-loaded clutch includes a coil spring mounted within the rotating spool, said coil spring having a first end and a second end, said first end being anchored to the rotating spool and the second end being fixedly anchored relative to the housing, the coil spring being wound so that when the rotating spool is unwound the coil spring is wound. ### Claim 12 (depends on 11) The device according to claim 11, wherein the clutch comprises a spring loaded armature pivotally mounted on the rotating spool and having a contoured outer edge for engaging a contoured inner surface of an annular rim fixed to the non-rotating spool so as to prevent rotation of the rotating spool and being responsive to tension in the first section of the cable for rotating the clutch thereby releasing the clutch from the annular rim thereby allowing rotation of the rotating spool. ### Claim 13 (depends on 1) The device according to claim 1, further including a limiter device operatively connected to the first section of the cable for limiting the extent to which the first section of the cable can be withdrawn from the housing. ### Claim 14 (depends on 13) The device according to claim 13, wherein the limiter device comprises an armature crimped to the first section of the cable proximate the common junction between the first and second sections and configured to engage an internal surface of the housing and prevent further withdrawal of the cable.