unit a spiral retraction spring 22 of the retractable cover 12 is shown in fig6 the spiral retraction spring 22 resides inside the housing 14 preferably at one end of a front and rear roller 24 the spiral retraction spring 22 is wound by extracting the covers 12 a and 12 b from the housing 14 and relaxes to rotate the roller 24 to retract the cover 12 into the housing 14 a locking mechanism 17 locks the covers 12 a and 12 b in the extracted position and tugging on the covers 12 a and 12 b releases the locking mechanism 17 allowing a user to guide each cover 12 a and 12 b back into the housing 14 an example of a locking mechanism 17 comprises wedges 18 and springs 20 biasing the wedges into an unlocked position and quickly releasing the cover 12 a and 12 b urges the wedges 18 together to lock the cover 12 a and 12 b in the deployed position those skilled in the art will recognize other locking mechanisms and any retractable cover with a similarly functioning locking mechanism is intended to come within the scope of the present invention a top view of a gear drive motor driven retractable cover is shown in fig7 a and a front view of a gear drive motor driven retractable cover is shown in fig7 b a motor 26 drives the roller 24 to retract the covers 12 and 12 b the roller is driven through motor gear 28 and roller gear 30 to rotate the roller 24 a sprague or one way clutch 32 may reside between the roller gear 30 and the roller 24 or between the motor.