Automated self-cleaning litter box for cats

  • US RE36,847 E
  • Filed: 12/24/1997
  • Issued: 09/05/2000
  • Est. Priority Date: 01/12/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. In an improved self-cleaning cat litter box including:

  • a pan-shaped housing having a bottom and two spaced side walls connecting a storage end wall to a discharge end wall, the housing defining an upwardly open litter chamber to be filled to a given fill level with cat litter;

    a comb path extending from the storage end wall to the discharge end wall;

    a comb extending between the side walls; and

    a comb drive for driving the comb along the comb path from a storage position adjacent the storage end wall to a discharge position adjacent the discharge end wall and back to the storage position, the comb projecting down into the litter chamber to a level below the fill level and near the housing bottom while the comb moves toward the discharge end wall so that the comb engages any clumps in the litter and carries such clumps to the discharge position;

    the improvement comprising;

    a cat exit sensor for sensing exit of a cat from the litter chamber;

    delay means, connected to the cat exit sensor and to the comb drive, for actuating the comb drive to drive the comb from the storage position to the discharge position and back to the storage position at a predetermined time subsequent to sensing of exit of a cat from the litter chamber anda litter level sensor for sensing an insufficient quantity of litter in the litter chamber, below the given fill level.

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