Trash can assembly
Patent No. US7540396 (titled "Trash can assembly") on Aug 10, 2005. The application was issued on Jun 2, 2009.
What is this patent about?
’396 is related to the field of household waste containers, specifically step-actuated trash cans. It addresses common mechanical failures and user experience issues such as loud slamming lids, metal-on-metal friction at pivot points, and the difficulty of removing internal liners without coming into contact with waste or germs.
The underlying idea behind ’396 is to isolate moving parts from direct contact and environmental debris to ensure smooth, quiet operation. By introducing a non-metal interface between the primary hinge components and utilizing a specialized support frame to house these mechanisms, the invention prevents the squeaking and grinding typical of traditional metal-to-metal joints while simultaneously protecting the hinge from dust and waste particles.
The claims of ’396 focus on a specific hinge architecture where a lid is pivotably connected to an outer shell via a connector that is entirely enclosed within the interior space of the assembly. This connector utilizes a metal sleeve, a non-metal tube positioned inside that sleeve, and a metal shaft residing within the tube’s bore, ensuring the shaft is radially separated from the sleeve to eliminate friction and noise.
In practice, the assembly uses a foot pedal and a link assembly to translate downward foot pressure into the upward movement of lifting rods. A motion damper with a toothed bar and damping wheel is integrated into this linkage to slow the closing speed of the lid. To improve hygiene, the upper support frame includes a ridge for the liner to rest on and a scalloped groove that allows a user to lift the liner by its lip without touching the interior surfaces of the can.
This design differs from prior approaches by moving the hinge mechanisms from the exterior to the protected interior of the shell and replacing direct metal contact with a plastic-to-metal barrier. While conventional cans often suffer from hinge wear and loud slamming, this invention uses the combination of the internal non-metal tube and a rotary damper to provide a durable, silent, and sanitary waste management solution.
How does this patent fit in bigger picture?
Technical Landscape
In the early 2000s when ’396 was filed, household refuse containers were typically implemented using rigid shells with simple mechanical linkages that relied on gravity-driven closure. At a time when foot-pedal systems commonly relied on direct metal-to-metal contact for hinges and pivots, mechanical wear and acoustic resonance during operation were standard engineering constraints. When these systems were actuated, the lack of integrated resistance mechanisms meant that hardware components were subject to high-impact forces, making the management of kinetic energy and noise attenuation non-trivial within the constraints of basic consumer hardware architectures.
Prosecution Position
The disclosed invention represents a technical advancement through the integration of a motion-damping mechanism directly into the mechanical link assembly of a pedal-actuated container. This architectural shift moves away from uncontrolled gravitational closure toward a regulated descent, effectively reducing mechanical stress and acoustic output. Furthermore, the assembly introduces a specialized support frame and liner interface that enables sanitary removal of internal components through a specific ridge-and-groove geometry. By incorporating non-metallic interface tubes within the hinge sleeves, the design overcomes the technical constraint of metal-to-metal grinding, enhancing the durability and operational smoothness of the pivoting components.
Claims
The patent contains a total of 16 claims, with claims 1, 7, and 14 serving as the independent claims. These independent claims focus on the structural configuration of a trash can assembly, specifically detailing a lid hinge or connector mechanism that is housed within an upper support frame and positioned so that it is enclosed and only exposed to the interior space of the shell. The dependent claims serve to further specify the material composition of the components, the geometric dimensions and mechanical features of the hinge pins and sleeves, and the inclusion of additional elements such as inner liners or lifting rods.
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US7540396
- Application Number
- US11201369A
- Filing Date
- Aug 10, 2005
- Publication Date
- Jun 2, 2009
- External Links
- Slate, USPTO , Google Patents