Hand-Held Conformable Sanding Block
Patent No. US11292103 (titled "Hand-Held Conformable Sanding Block") was filed by Trade Associates Inc on Dec 19, 2017.
What is this patent about?
’103 is related to the field of sanding blocks, specifically addressing the need for blocks that can conform to both flat and curved surfaces. Traditional sanding blocks, often made of wood, cork, or rigid rubber, struggle to evenly sand curved surfaces, leading to uneven results, damage to the sandpaper, and potential harm to the underlying material. This is particularly relevant in industries like automobile repair, where diverse and complex surface geometries are common.
The underlying idea behind ’103 is to create a sanding block with a specific blend of materials that provides both flexibility and structural integrity. This is achieved by combining ethylene-vinyl acetate (EVA) copolymer and low-density polyethylene (LDPE) in a controlled ratio, along with a blowing agent to create a foam-like structure. The EVA contributes to the block's softness and conformability, while the LDPE adds rigidity and durability.
The claims of ’103 focus on an elastomeric sanding block made from a composition including an admixture of EVA copolymer, LDPE homopolymer, and a metallocene catalyzed ethylene-α-olefin copolymer. The admixture is present in a specific weight percentage range, along with a filler and a carbon pigment. The claims also cover a method for manufacturing this sanding block, involving forming the composition, heating it to create a feedstock, thermoforming the feedstock into a foamed sheet, and then cutting the sheet into the desired sanding block shape.
In practice, the manufacturing process involves mixing the dry components, including the EVA, LDPE, filler, and pigment, and then feeding this mixture into a continuous mixer. Heat is applied to create a homogenous melt, and a blowing agent is added to induce foaming. The molten composition is then processed through a calendering machine to create a uniform sheet, which is subsequently thermoformed and cut into the final sanding block shape. The resulting block exhibits a Shore A hardness between 30 and 90, providing a balance between flexibility and firmness.
The key differentiation from prior approaches lies in the specific material composition and the resulting properties of the sanding block. Unlike rigid blocks that cannot conform to curved surfaces, or overly soft blocks that lack support, ’103 achieves a balance by carefully controlling the ratio of EVA and LDPE, along with the addition of a blowing agent to create a foamed structure . This allows the sanding block to conform to various surface shapes while still providing sufficient rigidity for effective sanding, polishing, or buffing.
How does this patent fit in bigger picture?
Technical landscape at the time
In the early 2010s when ’103 was filed, sanding blocks at a time when sanding blocks were typically implemented using wood, cork, rubber, or other resilient materials. These materials were often used with holding clamps, sharp teeth, or clips to secure sandpaper. However, hardware or software constraints made it non-trivial to create sanding blocks that could readily conform to both flat and curved surfaces, especially in industries like automobile repair where diverse designs and surface features were common.
Novelty and Inventive Step
The examiner approved the application because the claimed elastomeric sanding block, made from a specific composition and ingredient amounts, was deemed non-obvious over the cited prior art. Specifically, the examiner found that prior art related to polishing pads did not suggest including a metallocene-catalyzed ethylene-α-olefin copolymer in an ethylene vinyl acetate copolymer/low-density polyethylene mixture. Furthermore, prior art disclosing an elastomeric composition for footwear parts did not teach or suggest combining the specific polymers with a filler and carbon pigment in the claimed amounts to produce a sanding block.
Claims
This patent contains 9 claims, with claims 1 and 8 being independent. Independent claim 1 focuses on the composition of an elastomeric sanding block, while independent claim 8 focuses on a method for manufacturing the sanding block. The dependent claims generally elaborate on specific features, compositions, or processes related to the sanding block and its manufacture.
Key Claim Terms New
Definitions of key terms used in the patent claims.
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Date
Description
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US11292103
- Application Number
- US15846853
- Filing Date
- Dec 19, 2017
- Status
- Granted
- Expiry Date
- Oct 2, 2033
- External Links
- Slate, USPTO, Google Patents