Automatic cat excrement removing device
Pith reviewed 2026-07-01 18:31 UTC · model grok-4.3
The pith
A rotating ball-shaped assembly sifts cat litter through holes while trapping larger excrement for collection.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The ball compartment assembly, formed as a revolving body, rotates in a first direction so that at a first position the screening compartment is lowest and litter falls through holes while excrement remains in the working compartment due to size difference; at a second position the excrement collection compartment is lowest and receives the excrement through its opening once the cover plate opens.
What carries the argument
The ball compartment assembly with three integrated compartments (working, screening with holes, and excrement collection with cover plate) that rotate together around a shared axis to change which compartment is lowest.
If this is right
- Litter is returned to the working compartment after screening while excrement is isolated in its own compartment.
- The cover plate assembly allows the opening to be closed after collection to contain waste.
- The entire assembly detaches from the pedestal for emptying or cleaning.
Where Pith is reading between the lines
- The size-based separation principle could extend to other granular waste streams if hole sizes are adjusted accordingly.
- Repeated cycles might require monitoring for litter degradation or moisture buildup that alters particle sizes.
Load-bearing premise
Cat excrement remains intact and larger than the screening holes throughout rotation without breaking or passing through.
What would settle it
A test rotation where measured excrement particles fall through the screening holes or the assembly fails to reach the defined positions without jamming.
read the original abstract
1 . An automatic cat excrement removing device, comprising: a pedestal; a ball compartment assembly, wherein the ball compartment assembly is detachably mounted on the pedestal, wherein the ball compartment assembly has an axis and is configured to rotate around the axis relative to the pedestal, wherein a peripheral contour of the ball compartment assembly is a shape of a revolving body, wherein the peripheral contour of the ball compartment assembly is formed by a working compartment, a screening compartment, and an excrement collection compartment, wherein the excrement collection compartment is provided with an opening that is configured to allow cat excrement to fall into the excrement collection compartment, wherein an excrement collection compartment cover plate assembly is disposed at the opening of the excrement collection compartment, wherein the excrement collection compartment cover plate assembly is configured to selectively open or close the opening; wherein when the ball compartment assembly rotates to an initial position, the working compartment is located at a lowest position of the ball compartment assembly; when the ball compartment assembly rotates in a first direction to a first position from the initial position, the screening compartment is located at the lowest position of the ball compartment assembly, so that cat litter falls into the screening compartment through a plurality of screening holes, while the cat excrement stays in the working compartment because a size of the cat excrement is larger than a size of each of the plurality of screening holes; and when the ball compartment assembly rotates in the first direction from the first position to a second position, the excrement collection compartment is located at the lowest position of the b
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript is a patent application for an automatic cat excrement removing device. It comprises a pedestal and a detachably mounted ball compartment assembly that rotates around an axis, with a peripheral contour formed by a working compartment, a screening compartment containing multiple screening holes, and an excrement collection compartment with an opening and cover plate assembly. The design specifies rotation sequences: initial position places the working compartment lowest; first position places the screening compartment lowest so litter falls through the holes while larger excrement remains in the working compartment; second position places the excrement collection compartment lowest for collection.
Significance. If the mechanism operates as described, the invention could provide a practical automated solution for separating cat litter from excrement using gravity and size-based screening during controlled rotation, potentially improving hygiene and reducing manual maintenance for pet owners. The revolving body shape and sequential positioning represent a straightforward mechanical approach to the problem. As a patent document the description supplies a clear functional specification, though the lack of any performance data or implementation details limits assessment of real-world utility.
major comments (2)
- [Abstract] Abstract (description of rotation to first position): the central separation claim—that cat excrement remains in the working compartment solely because its size exceeds the screening holes—depends on unstated assumptions about excrement consistency, hole dimensions, and absence of deformation or jamming during rotation; without these specifications the functional assertion cannot be evaluated.
- [Abstract and device composition] Overall device description: no information is given on the rotation drive mechanism, motor, sensors, or control logic for the cover plate assembly, all of which are required to realize the 'automatic' operation asserted in the title and abstract.
minor comments (2)
- [Abstract] The provided abstract text is truncated mid-sentence ('the lowest position of the b').
- [General] Inclusion of labeled diagrams showing the three positions and rotation path would substantially improve clarity of the mechanical sequence.
Simulated Author's Rebuttal
We thank the referee for their review of our patent application. We address the major comments point by point below, with proposed revisions to improve clarity on the separation mechanism and automatic operation.
read point-by-point responses
-
Referee: [Abstract] Abstract (description of rotation to first position): the central separation claim—that cat excrement remains in the working compartment solely because its size exceeds the screening holes—depends on unstated assumptions about excrement consistency, hole dimensions, and absence of deformation or jamming during rotation; without these specifications the functional assertion cannot be evaluated.
Authors: We agree that the description relies on the size-based separation principle without explicit dimensions or material assumptions. The patent claims the functional outcome based on standard cat litter (granules typically 1-4 mm) and larger solid excrement. In revision we will add language specifying that the screening holes are dimensioned smaller than typical excrement (e.g., diameter <5 mm) to retain it while allowing litter passage, and note that the design assumes non-deformable excrement under normal conditions. This addresses the evaluation concern without altering the core invention. revision: yes
-
Referee: [Abstract and device composition] Overall device description: no information is given on the rotation drive mechanism, motor, sensors, or control logic for the cover plate assembly, all of which are required to realize the 'automatic' operation asserted in the title and abstract.
Authors: The manuscript emphasizes the novel revolving ball compartment assembly and its positional mechanics for separation, which constitute the inventive contribution. Standard drive components (motor, sensors, control logic) are not claimed as novel and are therefore omitted from the detailed description, as is common in mechanical patents where the focus is on the functional structure. However, to better support the 'automatic' title, we will add a short paragraph noting that rotation is effected by a conventional electric motor with timer- or sensor-based control, and the cover plate is actuated by a solenoid or servo under the same control system. This is a partial revision limited to clarification. revision: partial
Circularity Check
No circularity: mechanical patent is a design specification with no derivations
full rationale
This is a patent application describing the structure and intended function of a rotating cat litter device. The text contains no equations, predictions, fitted parameters, first-principles derivations, or load-bearing claims that reduce to prior results. All statements are direct mechanical specifications (e.g., compartment positions during rotation and screening by hole size), with no self-referential logic or statistical forcing. The document is therefore self-contained against external benchmarks and receives the default non-circularity finding.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.