Cable retractor

1. A cable retractor comprising:

(a) a housing;

(b) a spool, disposed within the housing, that is mechanically coupled to the housing and rotatable about an axis in a first rotational direction by which a cable is wound around the spool and in a second rotational direction that is opposite to the first rotational direction and by which the cable is unwound from the spool;

(c) a spring mechanism operatively attached to the spool and configured to urge the spool to rotate in the first rotational direction;

(d) an electrically operated rotation regulator operatively attached to the spool and configured to, when activated, prevent the spool from rotating in the first rotational direction while permitting the spool to rotate in the second rotational direction, thereby permitting a portion of the cable to be unwound from the spool and preventing the portion of the cable from being rewound around the spool; and

(e) a switch configured to deactivate the rotation regulator and cause the rotation regulator to remain deactivated after operation of the switch so that the operation of the switch causes the spring mechanism to urge the spool to rotate in the first rotational direction until all of a previously pulled out segment of the cable is drawn back into the housing.

2. The cable retractor of claim 1 , wherein:

(a) the spool, the electrically operated rotation regulator, and the spring mechanism are disposed inside the housing; and

(b) the switch is disposed external to the housing.

3. A cable retractor, comprising:

(a) a housing;

(b) a spool, disposed within the housing, that is mechanically coupled to the housing and rotatable about an axis in a first rotational direction by which a cable is wound around the spool and in a second rotational direction that is opposite to the first rotational direction and by which the cable is unwound from the spool;

(c) a spring mechanism operatively attached to the spool and configured to urge the spool to rotate in the first rotational direction;

(d) an electrically operated rotation regulator operatively attached to the spool and configured to, when activated, prevent the spool from rotating in the first rotational direction while permitting the spool to rotate in the second rotational direction, thereby permitting a portion of the cable to be unwound from the spool and preventing the portion of the cable from being rewound around the spool; and

(e) a switch configured to deactivate the rotation regulator only during operation of that switch and to re-activate the rotation regulator subsequent to the operation of the switch so that

(1) during operation of the switch, the spring mechanism urges the spool to rotate in the first rotational direction and causes a part of a previously pulled out segment of the cable to be drawn back into the housing, and

(2) after the switch is operated, a remaining part of the previously pulled out segment remains external to the housing.

4. A cable retractor, wherein:

(a) a housing;

(b) a spool, disposed within the housing, that is mechanically coupled to the housing and rotatable about an axis in a first rotational direction by which a cable is wound around the spool and in a second rotational direction that is opposite to the first rotational direction and by which the cable is unwound from the spool;

(c) a spring mechanism operatively attached to the spool and configured to urge the spool to rotate in the first rotational direction; and

(d) an electrically operated rotation regulator operatively attached to the spool and configured to, when activated, prevent the spool from rotating in the first rotational direction while permitting the spool to rotate in the second rotational direction, thereby permitting a portion of the cable to be unwound from the spool and preventing the portion of the cable from being rewound around the spool, wherein:

(e) an outer surface of the housing includes a plurality of hooks configured to engage corresponding openings in a surface upon which the housing is mounted.

5. The cable retractor of claim 4 , wherein:

(a) the outer surface of the housing includes a snap connector configured to secure the housing to an edge of the surface.

6. A cable retractor, comprising:

(a) a housing;

(b) a spool, disposed within the housing, that is mechanically coupled to the housing and rotatable about an axis in a first rotational direction by which a cable is wound around the spool and in a second rotational direction that is opposite to the first rotational direction and by which the cable is unwound from the spool;

(c) a spring mechanism operatively attached to the spool and configured to urge the spool to rotate in the first rotational direction about the axis;

(d) a one-way bearing coupled to the spool and configured to rotate only in the second rotational direction about the axis;

(e) a shaft coupled at one end to the one-way bearing; and

(f) an electromagnetic clutch coupled to the housing and configured to, when activated, engage an opposing end of the shaft whereby the one-way bearing prevents the spool from rotating in the first rotational direction while permitting the spool to rotate in the second rotational direction, thereby permitting a portion of the cable to be unwound from the spool and preventing the portion of the cable from being rewound around the spool, wherein;

(1) withdrawing a segment of the cable from inside the housing activates the electromagnetic clutch and prevents the pulled out segment from being drawn back into the housing; and

(g) a switch configured to deactivate the electromagnetic clutch and cause the electromagnetic clutch to remain deactivated after operation of the switch so that the operation of the switch causes the spring mechanism to urge the spool to rotate in the first rotational direction until all of the pulled out segment of the cable is drawn back into the housing.

7. A cable retractor, comprising:

(a) a housing;

(b) a spool, disposed within the housing, that is mechanically coupled to the housing and rotatable about an axis in a first rotational direction by which a cable is wound around the spool and in a second rotational direction that is opposite to the first rotational direction and by which the cable is unwound from the spool;

(c) a spring mechanism operatively attached to the spool and configured to urge the spool to rotate in the first rotational direction about the axis;

(d) a one-way bearing coupled to the spool and configured to rotate only in the second rotational direction about the axis;

(e) a shaft coupled at one end to the one-way bearing; and

(f) an electromagnetic clutch coupled to the housing and configured to, when activated, engage an opposing end of the shaft whereby the one-way bearing prevents the spool from rotating in the first rotational direction while permitting the spool to rotate in the second rotational direction, thereby permitting a portion of the cable to be unwound from the spool and preventing the portion of the cable from being rewound around the spool, wherein;

(1) withdrawing a segment of the cable from inside the housing activates the electromagnetic clutch and prevents the pulled out segment from being drawn back into the housing; and

(g) a switch configured to deactivate the electromagnetic clutch and during operation of that switch and to re-activate the electromagnetic clutch subsequent to the operation of the switch so that

(1) during operation of the switch, the spring mechanism urges the spool to rotate in the first rotational direction and causes part of the pulled out segment of the cable to be drawn back into the housing, and

(2) after the switch is operated, a remaining part of the pulled out segment remains external to the housing.

8. A cable retractor, comprising:

(a) a housing;

(b) a spool, disposed within the housing, that is mechanically coupled to the housing and rotatable about an axis in a first rotational direction by which a cable is wound around the spool and in a second rotational direction that is opposite to the first rotational direction and by which the cable is unwound from the spool;

(c) a spring mechanism operatively attached to the spool and configured to urge the spool to rotate in the first rotational direction;

(d) an electrically operated rotation regulator operatively attached to the spool and configured to, when activated, prevent the spool from rotating in the first rotational direction while permitting the spool to rotate in the second rotational direction, thereby permitting a portion of the cable to be unwound from the spool and preventing the portion of the cable from being rewound around the spool; and

(e) a switch configured to deactivate the rotation regulator.

9. The cable retractor of claim 8 , wherein:

(a) withdrawing a segment of the cable from inside the housing activates the rotation regulator and prevents the pulled out segment from being drawn back into the housing; and

(b) the switch is configured to cause the rotation regulator to remain deactivated after operation of the switch so that the operation of the switch causes the spring mechanism to urge the spool to rotate in the first rotational direction until all of the pulled out segment of the cable is drawn back into the housing.

10. The cable retractor of claim 8 , wherein:

(a) withdrawing a segment of the cable from inside the housing activates the rotation regulator and prevents the pulled out segment from being drawn back into the housing; and

(b) the switch is configured to deactivate the rotation regulator only during operation of that switch and to re-activate the rotation regulator subsequent to the operation of the switch so that

(1) during operation of the switch, the spring mechanism urges the spool to rotate in the first rotational direction and causes part of the pulled out segment of the cable to be drawn back into the housing, and

(2) after the switch is operated, a remaining part of the pulled out segment remains external to the housing.

11. The cable retractor of claim 8 , wherein:

(a) the spool, the electrically operated rotation regulator, and the spring mechanism are disposed inside the housing; and

(b) the switch is disposed external to the housing.

12. The cable retractor of claim 8 , wherein:

(a) the electrically operated rotation regulator further comprises an electromagnetic clutch coupled to the housing.

13. The cable retractor of claim 12 , further comprising:

(a) a one-way bearing coupled to the spool and configured to rotate only in the second rotational direction; and

(d) a shaft coupled at one end to the one-way bearing; wherein

(e) the electromagnetic clutch, when activated, engages an opposing end of the shaft whereby the one-way bearing prevents the spool from rotating in the first rotational direction.