A - Human Necessities – 61 – G
Patent
A - Human Necessities
61
G
4/48, 135/0.1
A61G 10/00 (2006.01) E04H 4/10 (2006.01)
Patent
CA 1206061
MOTORIZED POOL COVER ABSTRACT OF THE DISCLOSURE A pool cover is alternately reeled on the spool and drawn across the pool by a mechanism in which a motor-driven shaft reels in a cover sheet to uncover the pool and the free end of the sheet is pulled by cords reeled onto drums connected to the driven shaft to cover the pool. The cords are reeled around the drums in the opposite direction from which the sheet is reeled around the spool, and the cords are entrained around direction- reversing pulleys at the opposite end of the pool, an arrangement which results in the cord being reeled on the drums as the sheet is paid out from the spool and vice-versa. The cord velocity and cover sheet velocity are attempted to be matched and held constant by winding the cords onto from a conical cord drum for the cords. The cord is guided precisely onto and from a given diameter portion on the conical drum by a cord carriage. It is preferred to try to obtain a constant and uniform tension on the opposite beaded edges of the cover sheet and on the cords on opposite sides of the pool to prevent slack from developing in the cover sheet or cords. Herein, biasing means for the spool and the cord drums are provided in the form of torsion springs that connect the spool and cord drums to the shaft. The torsion springs coil or uncoil to adjust somewhat the speeds of spool rotation and drum rotation with respect to the rotational speed of the shaft. The interconnection of the spool torsion springs and drum torsion springs maintain the sheet and cords under continuous tension. Limit switch means in the form of magnetically actuated switches along the side of the pool are actuated by magnets carried by the cover sheet to stop reel-in or pay-out of sheet at the fully covering or fully uncovering positions of the sheet.
438351
Biedermann Siegfried M.
Chapman Rick J.
Kaiser Ewald A.
Radtke Carl W.
Ibg International
Macrae & Co.
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