Cat litter sieving device and cat litter box

Peixin Xiao, Shenzhen (CN)

USPTO: us-12628791 · published 2026-05-19 · patents · A01K 1/0114

Cat litter sieving device and cat litter box

Peixin Xiao, Shenzhen (CN) This is my paper

Pith reviewed 2026-05-21 20:00 UTC · model grok-4.3

classification patents A01K 1/0114

keywords cat littersieving devicerotatable bodysand guide platestop groovestop protrusionlitter box

0 comments

The pith

A cat litter sieve uses interlocking stop grooves on a removable guide plate to hold position during rotation and separate clean sand from waste.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The patent describes a rotatable litter container whose internal space is divided by a sand guide plate and a mesh into a storage cavity and a sieving cavity. The guide plate locks into place through stop protrusions that seat into matching grooves on the plate, backed by reinforcing ribs, so the plate does not slip when the whole body is turned. The drain outlet sits on the sieving side, allowing waste to exit while clean litter stays behind. A user can therefore rotate the device, sift the litter, and empty clumps without disassembling the unit each time. The design treats the mechanical interlock as sufficient to keep alignment under normal litter weight and repeated turns.

Core claim

The rotatable body, sand guide plate, and sieving net divide the storage space into distinct sand storage and sieving cavities; the plate is held against rotation-induced slippage by stop protrusions that engage stop grooves on the plate, with reinforcing ribs placed between multiple stop seats.

What carries the argument

Stop protrusion on the inner wall of the sand storage cavity that seats into a stop groove on the sand guide plate, reinforced by ribs between adjacent stop seats, to generate blocking force and maintain alignment during rotation.

If this is right

Rotation alone can move waste to the drain while clean litter remains in the storage cavity.
The guide plate can be lifted out for separate washing because it is not permanently fastened.
The same stop geometry works with at least two spaced stop seats, distributing the blocking force.
The drain outlet on the sieving side lets clumps exit directly when the body is tilted.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same interlock pattern could be applied to any rotating sifter that handles granular material such as grain, sand, or pellets.
Adding a simple visual wear indicator on the grooves would let owners know when replacement is needed before failure occurs.
A version scaled for larger animals or different litter types would require only changes in mesh size and cavity volume.

Load-bearing premise

The protrusion-and-groove engagement plus the reinforcing ribs will keep the plate from slipping or wearing out under repeated rotation and the weight of litter without any extra fasteners or long-term durability testing.

What would settle it

Place a full load of used litter in the assembled device, rotate it through fifty full cycles, then check whether the guide plate has shifted or the grooves show visible wear that allows slippage.

read the original abstract

18 . A cat litter sieving device, comprising: a rotatable body, a sand guide plate, and a sieving net; wherein the rotatable body defines a storage space and a drain outlet communicating with the storage space; the sand guide plate and the sieving net are connected to each other, cooperatively dividing the storage space into a sand storage cavity and a sand sieving cavity; the drain outlet is arranged on the sand sieving cavity, and the sieving net has a mesh structure; the sand guide plate is removably connected to the rotatable body; a side of the sand guide plate away from the sieving net is disposed to face the drain outlet; a stop portion is arranged on an inner wall of the storage space, and the stop portion abuts against the side of the sand guide plate away from the sieving net to generate a blocking force, for preventing the side of the sand guide plate away from the sieving net from slipping within the storage space; wherein the stop portion comprises a stop protrusion disposed on an inner wall of the sand storage cavity; the sand guide plate defines a stop groove on the side away from the sieving net, and the stop protrusion is engaged with the stop groove; wherein the sand guide plate is arranged with at least two stop seats, and each of the at least two stop seats defines the stop groove; the side of the sand guide plate away from the sieving net is further arranged with a reinforcing rib disposed between each adjacent two of the at least two stop seats.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This is a utility patent on a rotating cat litter sieve that claims a removable guide plate locked by stop protrusions into grooves plus an interposed reinforcing rib; the geometry is described clearly but carries no load analysis or durability data.

read the letter

The core of the filing is a mechanical arrangement for a rotatable litter box: a sand guide plate and sieving net divide the drum into storage and sieving sections, with the plate held against rotation by stop protrusions on the inner wall that seat into grooves on the plate, stiffened by ribs between the seats. The removable connection is the practical point, letting the user pull the plate out for cleaning while the stops are meant to keep everything aligned under normal use. That specific combination of dual stop seats and the rib between them is what the claims treat as the distinguishing feature over earlier rotating-sieve designs. The description itself is straightforward and dimensionally consistent on paper, which makes the intended function easy to visualize. The obvious limitation is that nothing in the text checks whether the protrusion-groove contact actually supplies enough force to resist the weight of damp litter plus the torque from turning the drum. There are no friction estimates, material specs, tolerance stack-ups, or even a simple statics sketch. Without those, the blocking force is an assumption rather than a demonstrated result. The rest of the document is standard patent language around the same geometry. For someone designing or manufacturing consumer litter boxes this level of detail could be useful as a starting point for prototyping. For any technical or scientific audience the absence of verification makes it thin. I would not route it to peer review; it is a design filing that stands or falls on examination of the claims against prior art, not on referee evaluation of evidence.

Referee Report

1 major / 0 minor

Summary. The manuscript is a utility patent (claim 18 and dependent claims) describing a cat litter sieving device consisting of a rotatable body that defines a storage space and drain outlet, a sand guide plate removably connected to the body, and a sieving net. These elements divide the storage space into sand storage and sieving cavities; a stop protrusion on the inner wall engages a stop groove on the guide plate, reinforced by ribs between stop seats, to generate a blocking force that prevents slippage of the guide plate during rotation.

Significance. If the geometric interlock functions under load, the design could provide a practical, tool-free removable sieve mechanism for litter boxes. The patent supplies no experimental data, force calculations, material specifications, or durability testing, so significance remains speculative.

major comments (1)

[Claim 18] Claim 18: the assertion that the stop protrusion–groove engagement together with the reinforcing ribs 'generate a blocking force' sufficient to prevent slippage is unsupported; no dimensions, friction coefficients, material choices, static load estimates, or torque analysis are provided to show that the engagement force exceeds gravitational and inertial loads from litter mass during rotation.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the detailed reading of Claim 18. The comment correctly notes the absence of quantitative mechanical analysis. Below we respond directly to that point and indicate that no revision to the claim language is required.

read point-by-point responses

Referee: [Claim 18] Claim 18: the assertion that the stop protrusion–groove engagement together with the reinforcing ribs 'generate a blocking force' sufficient to prevent slippage is unsupported; no dimensions, friction coefficients, material choices, static load estimates, or torque analysis are provided to show that the engagement force exceeds gravitational and inertial loads from litter mass during rotation.

Authors: Claim 18 is a structural claim that defines a novel mechanical interlock (stop protrusion engaging a stop groove, reinforced by ribs between stop seats) whose purpose is to generate a blocking force. Utility patents routinely claim such geometric arrangements without embedding numerical force or torque calculations inside the claim itself; enablement is satisfied by the written description and drawings that illustrate the engagement. The functional phrase “to generate a blocking force, for preventing … slipping” is therefore a statement of intended mechanical effect, not an unsupported performance assertion requiring the data listed by the referee. revision: no

Circularity Check

0 steps flagged

No circularity: direct geometric specification of mechanical interlock

full rationale

The patent contains no derivations, equations, fitted parameters, predictions, or self-citations. Claim 18 and the accompanying description are a pure geometric and structural specification of a rotatable body, sand guide plate, stop protrusion/groove engagement, and reinforcing ribs. The reader's circularity score of 0.0 is confirmed; the design is asserted by construction without any reduction of outputs to inputs via fitting or citation chains.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The patent introduces no free parameters, mathematical axioms, or new physical entities; it relies only on standard engineering assumptions about rigid-body mechanics and plastic molding tolerances.

pith-pipeline@v0.9.0 · 5810 in / 1059 out tokens · 34892 ms · 2026-05-21T20:00:53.660790+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith.Foundation.DimensionForcing alexander_duality_circle_linking unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

stop protrusion ... engaged with the stop groove ... reinforcing rib disposed between each adjacent two of the at least two stop seats
IndisputableMonolith.Foundation.LedgerCanonicality uniform_scaling_forced unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

the sand guide plate is removably connected to the rotatable body

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.