Underside particle flap for shredder
Patent No. US7731112 (titled "Underside particle flap for shredder") on Jul 1, 2008. The application was issued on Jun 8, 2010.
What is this patent about?
’112 is related to the field of document destruction devices, specifically paper shredders equipped with waste management features. In conventional shredders, residual paper particles often remain trapped in the cutting assembly or strippers after a shredding cycle. When a user removes the waste bin to empty it, these loose particles frequently fall through the discharge opening, creating a mess on the floor or inside the shredder cabinet, which represents a significant consumer annoyance.
The underlying idea behind ’112 is the integration of a dynamic mechanical barrier at the discharge point that automatically seals the shredder mechanism when the waste container is disengaged. Rather than relying on manual intervention or gravity-based flaps, the invention utilizes an active closure system linked to the operational state or physical position of the bin. This ensures that any residual debris is captured and held within the housing until a container is safely back in place to receive it.
The claims of ’112 focus on a shredder housing equipped with a selectively positionable closure located at the output opening, controlled by an actuator that responds to a predetermined operational condition. One primary embodiment specifies a rolling closure featuring a flexible panel and a storage drum that extends or retracts the barrier along an axis. Another independent claim defines a sliding closure that moves in a direction generally perpendicular to the path of the waste container’s removal.
In practice, the system functions through a physical or magnetic linkage between the waste bin and the closure mechanism. As the user pulls the bin out, the actuator—which may be a magnetic flap, a spring-loaded arm, or a sliding extension—simultaneously draws the closure across the discharge path. This mechanical synchronization ensures the opening is sealed the moment the bin is no longer in a position to catch falling debris, effectively turning the lower housing into a temporary holding tray.
This approach differentiates itself from prior art by moving beyond simple safety flaps or bin-full indicators. By employing a flexible rolling panel or a guided sliding door, the invention provides a robust seal that can support the weight of accumulated shreds. Unlike passive flaps that might swing open during transport, this system uses positive mechanical engagement to maintain a clean environment, regardless of the shredder head's orientation or the user's handling of the device.
How does this patent fit in bigger picture?
Technical Landscape
In the late 2000s when ’112 was filed, document destruction systems were typically implemented using a gravity-fed architecture where a motorized cutting head was positioned directly above a collection volume. At a time when these systems commonly relied on an unobstructed vertical discharge path to prevent internal jams, the interface between the cutting elements and the waste container was generally left open to ensure continuous throughput. Mechanical constraints of the era meant that while safety interlocks or bin-level sensors were standard, the management of residual debris—specifically particles caught in the cutter elements or strippers that dislodge during container removal—was non-trivial and often resulted in the unintended discharge of waste onto the surrounding environment.
Prosecution Position
The disclosed invention represents a technical advancement in waste management architecture through the integration of an automated closure system at the discharge interface. By introducing a selectively positioned closure and an associated actuator, the system transitions from a passive gravity-fed opening to an active containment barrier that responds to specific operational conditions, such as the removal of the waste bin. This architectural shift overcomes the technical constraint of residual debris shedding by providing a physical catch mechanism that isolates the cutting head from the external environment during maintenance, thereby preventing the discharge of dislodged particles that typically occurs when the primary collection container is absent.
Claims
This patent contains 17 claims, with claims 1, 11, 12, and 17 serving as the independent claims. The independent claims focus on a shredder assembly and related methods featuring a movable closure, such as a rolling flexible panel or a sliding door, that automatically seals the shredder's output opening when a specific operational condition is met, such as the removal of the waste container. The dependent claims provide additional details regarding the mechanical components of the closure, including the use of interconnected slats, guide frames, and specific actuators like springs, magnets, or arms that facilitate the movement of the closure in response to the container's position.
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US7731112
- Application Number
- US12166000A
- Filing Date
- Jul 1, 2008
- Publication Date
- Jun 8, 2010
- External Links
- Slate, USPTO , Google Patents