Self-cleaning pet litter box assembly with reciprocating bars

• US 7,669,555 B2
• Filed: 07/26/2007
• Issued: 03/02/2010
• Est. Priority Date: 02/09/2004
• Status: Active Grant

• Current Assignee: Bank of New York Mellon Corporation
• Original Assignee: Richard H. Emery
• Inventors: Emery, Richard H.
• Primary Examiner(s): Smith; Kimberly S
• Assistant Examiner(s): Michener; Joshua J
• Application Number:
  US11/828,413
• Publication Number:
  US 20080017122A1
• Time in Patent Office: 950 Days
• Field of Search: 119/161, 119/163, 119/164, 119/165, 119/166, 119/168, 198/750.1, 198/750.2, 198/409, 198/429, 198/468.1, 198/517, 198/614, 198/750.14, 198/750.11, 198/621.1, 198/736, 209/329, 209/674, 209/677, 209/678, 209/660
• US Class Current: 119/166
• CPC Class Codes: A01K 1/0114 Litter boxes with screens for separating excrement from litter
• CPC Class Codes: B65G 25/02 the carrier or impeller having different forward and return paths of movement, e.g. walking beam conveyors
• CPC Class Codes: B65G 47/1471 Movement in one direction, substantially outwards

Abstract

A self-cleaning pet litter box has a conveyor to incrementally transport clumped litter material and solid pet waste to a waste receptacle. The conveyor has one end configured to extend into a pet litter container of the self-cleaning litter box and an opposite exit end. The conveyor is configured for reciprocating movement to lift the clumped litter material and solid pet waste from below, transport it some distance along the conveyor, place the material down again, return to its original position, and repeat the motion again to incrementally move the material along the conveyor toward the exit end for subsequent disposal.

Claims

1. A self-cleaning pet litter box assembly configured to separate and remove clumped litter and solid pet waste from clean litter material, comprising:

a base;

an open-top pet litter container configured to hold litter therein and being mounted for substantially horizontal rotation relative to said base;

a conveyor having one end configured to extend into the pet litter container and an opposite exit end, said conveyor comprising a first moving conveyor portion defined by a first plurality of horizontally spaced members and a second moving conveyor portion defined by a second plurality of horizontally spaced members, said first and second conveyor portions moving with reciprocating movement in an out-of-phase relationship and cooperating with each other to incrementally transport clumped litter and solid pet waste away from the litter within the pet litter container in a single direction toward the exit end thereof;

a first transverse crankshaft operatively coupled to the first moving conveyor portion and the second moving conveyor portion proximate the exit end; and

a second transverse crankshaft operatively coupled to the first moving conveyor portion and the second moving conveyor portion proximate the one end;

each of the first and second transverse crankshafts having a fixed axis of rotation, and each of the first and second transverse crankshafts operating so as to rotate in only a single direction to incrementally transport the clumped litter and solid pet waste toward the exit end of the conveyor.

2. The self-cleaning pet litter box assembly of claim 1 wherein each of said first and second moving conveyor portions has a plurality of detents disposed along at least a partial length thereof.

3. The self-cleaning pet litter box assembly of claim 1 further comprising a waste receptacle positioned adjacent the exit end of said conveyor to receive the clumped litter and solid pet waste incrementally transported toward the exit end by said conveyor.

4. The self-cleaning pet litter box assembly of claim 1 further comprising a separating member positioned to contact the litter within the pet litter container and being configured to separate clumped litter and solid pet waste from the litter within the pet litter container and direct the clumped litter and solid pet waste toward said conveyor.

5. The self-cleaning pet litter box assembly of claim 4 wherein said separating member includes a plurality of openings configured to retain the clumped litter and solid pet waste and permit unclumped material to pass through said openings.

6. The self-cleaning pet litter box assembly of claim 1 further comprising a drive mechanism operatively connected to said pet litter container to rotate said container.

7. The self-cleaning pet litter box assembly of claim 1 further comprising a drive mechanism operatively connected to said conveyor to drive said conveyor.

8. The self-cleaning pet litter box assembly of claim 1 further comprising a cover configured to fit over said open-top pet litter container and having an opening to expose litter contained within said container and provide access to the litter for use by the pet.

9. A self-cleaning pet litter box assembly configured to separate and remove clumped litter and solid pet waste from clean litter material, comprising:

a base;

an open-top pet litter container configured to hold litter therein and being mounted for substantially horizontal rotation relative to said base;

a drive mechanism operatively connected to said pet litter container to rotate said container;

a conveyor having one end configured to extend into the pet litter container and an opposite exit end, said conveyor comprising a first moving conveyor portion defined by a first plurality of horizontally spaced members and a second moving conveyor portion defined by a second plurality of horizontally spaced members, said first and second conveyor portions moving with reciprocating movement in an out-of-phase relationship and cooperating with each other to incrementally transport clumped litter and solid pet waste away from the litter within the pet litter container in a single direction toward the exit end thereof;

a first transverse crankshaft operatively coupled to the first moving conveyor portion and the second moving conveyor portion proximate the exit end; and

a second transverse crankshaft operatively coupled to the first moving conveyor portion and the second moving conveyor portion proximate the one end;

each of the first and second transverse crankshafts having a fixed axis of rotation, and each of the first and second transverse crankshafts operating so as to rotate in only a single direction to incrementally transport the clumped litter and solid pet waste toward the exit end of the conveyor;

a separating member positioned to contact the litter within the pet litter container and being configured to separate clumped litter and solid pet waste from the litter within the pet litter container and direct the clumped litter and solid pet waste toward said conveyor; and

a waste receptacle positioned adjacent the exit end of said conveyor to receive the clumped litter and solid pet waste incrementally transported by said conveyor.

10. The self-cleaning pet litter box assembly of claim 9 wherein each of said first and second moving conveyor portions has a plurality of detents disposed along at least a partial length thereof.

11. The self-cleaning pet litter box assembly of claim 9 wherein said separating member includes a plurality of openings configured to retain the clumped litter and solid pet waste and permit unclumped material to pass through said openings.

12. The self-cleaning pet litter box assembly of claim 9 further comprising a drive mechanism operatively connected to said conveyor to drive said conveyor.

13. The self-cleaning pet litter box assembly of claim 9 further comprising a cover configured to fit over said open-top pet litter container and having an opening to expose litter contained within said container and provide access to the litter for use by the pet.

14. A method of removing clumped material and solid pet waste from clean litter material in a pet litter box, the method comprising:

obtaining a pet litter box assembly having a horizontally rotating pet litter container and a conveyor having one end configured to extend into the pet litter container and an opposite exit end, the conveyor comprising a first moving conveyor portion defined by a first plurality of horizontally spaced members and a second moving conveyor portion defined by a second plurality of horizontally spaced members, said first and second conveyor portions moving with reciprocating movement and cooperating with each other, a first transverse crankshaft operatively coupled to the first moving conveyor portion and the second moving conveyor portion proximate the exit end, and a second transverse crankshaft operatively coupled to the first moving conveyor portion and the second moving conveyor portion proximate the one end, each of the first and second transverse crankshafts having a fixed axis of rotation, and each of the first and second transverse crankshafts operating so as to rotate in only a single direction to incrementally transport the clumped litter and solid pet waste toward the exit end of the conveyor, the method further comprising the steps of;

rotating the pet litter container to advance the clumped material and solid pet waste toward the conveyor; and

moving the first and second moving conveyor portions by reciprocating movement in an out-of-phase relationship to incrementally transport the clumped litter and solid pet waste away from the litter within the pet litter container in a single direction toward the exit end thereof.

15. The method of claim 14 further comprising the steps of:

positioning a waste receptacle proximate the exit end of the conveyor; and

receiving the separated-out clumped litter and solid pet waste in the waste receptacle.

16. The method of claim 14 wherein the pet litter box assembly further has a separating member positioned to contact the litter within the pet litter container, the method further comprising the steps of:

separating the clumped material and solid pet waste from the clean litter material by passing the clean litter material through the separating member; and

directing the clumped material and solid pet waste toward the conveyor with the separating member.

17. The method of claim 14 wherein each of the first and second moving conveyor portions has a plurality of detents disposed along at least a partial length thereof.