One-Jerk Bedmaker
 
"Suddenly he leaped to his feet, raced downstairs, and returned with two of his mother's spring-action clothespins.  Rummaging through the boxes on his inventing bench, he found a ball of strong cord and two small pulleys.  He tied the pulleys to the head of the bed, one on each side of the pillow.   He cut two long pieces of cord.  One end of each cord he tied to one of the clothespins.  The other ends he ran through the pulleys.  He brought the cords down under the bed, leaving plenty of slack on the floor, then tied the two cords to the footboard.  He squeezed open two clothespins and fastened one to the sheet and blanket on each side of the bed.

Alvin was about to try another great invention.  He climbed into bed, pulled up the covers, closed his eyes and tossed as though he were asleep.  A couple of minutes of hard sleep and the bed was a mess, but the sheet and blanket were still tucked in at the foot.  Alvin rolled out of bed and walked around to the footboard.  He stood there a moment, holding the two cords, almost afraid to try the invention.

He pulled slowly on the cords.  The blanket and sheet slid neatly into place, as though pulled by two invisible hands.

Alvin Fernald, Great Inventor, had done it again.