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Patent Information & Production OptionsDual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment · Patent CN112590435B

Patent CN112590435B: bibliographic data, legal status, family, a plain-language reading of the claims, plus customization, US compliance points and how a manufacturing project runs.

At a glance

Patent numberCN112590435B (application CN202110007159)
TypeChina invention patent (发明专利) - protects product structure and function
Original titleKnife rest of pencil sharpener (一种削笔器的刀架)
Patent ownerIndividual (Chen Jun)
Filing date2021-01-05
Grant date2024-07-09
Status (China)In force - valid until at most 2041-01-05, provided annual fees are paid
Patent familyChinese filings only - no US, European, Japanese, PCT or other filings listed
Cited by0 later documents
SourceGoogle Patents (search for CN112590435B)

What the claims cover, in plain language

Claim 1 defines a knife rest comprising a seat, a pen-containing bin assembly, and a hobbing cutter assembly. The seat has parallel support beams, front/rear baffles, and a partition plate creating front and rear cavities. The front baffle has a fixed pencil inserting hole. The bin assembly includes a block with two conical pen holes of different sizes (large: 14-20°, small: 7-13°) arranged at a 90-degree axial angle relative to each other. An adjusting shaft allows the block to rotate vertically, aligning either hole with the fixed inserting hole. The cutter assembly is mounted on the seat and interacts with the pencil passing through the aligned hole.

Dependent Claims specify details such as the eccentric wheel shape, the guide sliding grooves on the inner surfaces, the positioning raised head on the partition plate, and the connection pieces for the drive assembly. They also define the specific geometric relationships between the shafts and the concentricity of the holes.

This is a simplified reading for orientation only. The legal scope is defined by the exact claim wording in the official Chinese document.

What this means for US production

This patent was filed only in China and is currently in force. Making or selling this specific dual-angle rotating block design in China requires permission from the patent owner. However, since there are no US patents in this family, the technology itself is not protected in the United States.

Two points to settle early:

  • Other patents may exist. Pencil sharpeners are a mature field with numerous existing patents covering auto-stop mechanisms, safety switches, and alternative blade geometries. A freedom-to-operate (FTO) review is recommended to ensure your final product design does not infringe on other active US patents unrelated to this specific knife rest structure.
  • Material and Safety Standards. The design involves moving parts and electrical components (implied by the gear/drive assembly). Ensuring the plastic used is durable and meets electrical safety standards is critical for US market entry.

Customization and manufacturing

What can be customized

AreaOptions
Cone AnglesAdjust within the claimed ranges (e.g., 15° for writing, 8° for sketching) based on target user preference.
MaterialsABS, PC, or Nylon for the bin block and seat; stainless steel or carbon steel for the cutter.
Drive InterfaceModify the connecting piece (132) to fit specific DC motors or AC adapters available in your supply chain.
Color/FinishMold-in color plastics or painting options for the exterior visible parts.
Safety FeaturesAdd child-lock buttons or magnetic door sensors compatible with the housing.

Things to plan for (US market)

  • UL 60950-1 / UL 62368-1: If the sharpener is electric, it must meet safety standards for information technology equipment.
  • FCC Part 15: Electromagnetic compatibility testing for any electronic circuits or motors.
  • ASTM F963: Consumer Product Safety Improvement Act requirements for toys/children’s products if marketed to kids (though usually classified as office supplies, strict labeling may apply).
  • California Prop 65: Warning labels required if materials contain certain chemicals like phthalates or heavy metals above threshold levels.

How a project runs

  1. Inquiry - Define target cone angles, material preferences, and estimated volume.
  2. Design Adaptation - Engineer the housing to accommodate the patented knife rest structure; integrate motor and power supply.
  3. Prototype - 3D print or CNC machine samples to test alignment tolerance and sharpening quality.
  4. Tooling - Create injection molds for the seat and bin block; stamp/cut blades.
  5. Certification & Pilot - Run safety tests (UL/FCC); produce pilot batch for field testing.

Quantities & timeline

Injection molding tools for the complex geometric shapes of the bin block and seat require high-precision machining. Lead times for tooling typically range from 6-8 weeks depending on complexity. Send us your target cone angles, material specs, quantity, and timeline and we will reply with options.

Patent drawings

Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 1
Fig. 1 - Perspective view of the knife rest assembly.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 2
Fig. 2 - Front view of the knife rest.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 3
Fig. 3 - Exploded view of the components.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 4
Fig. 4 - Top view of the seat.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 5
Fig. 5 - Bottom view of the seat.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 6
Fig. 6 - Side view of the bin assembly.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 7
Fig. 7 - Cross-section showing alignment of holes.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 8
Fig. 8 - Detail of the adjusting shaft mechanism.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 9
Fig. 9 - View of the hobbing cutter assembly.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 10
Fig. 10 - Gear transmission detail.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 11
Fig. 11 - Eccentric wheel structure.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 12
Fig. 12 - Partition plate positioning features.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 13
Fig. 13 - Support beam hinge details.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 14
Fig. 14 - Rear baffle connection piece.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 15
Fig. 15 - Internal cavity layout.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 16
Fig. 16 - Guide slide groove detail.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 17
Fig. 17 - Positioning raised head interaction.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 18
Fig. 18 - Alternative view of the bin block.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 19
Fig. 19 - Axial alignment diagram.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 20
Fig. 20 - Operational state: Large hole aligned.
Dual-Angle Pencil Sharpener Knife Rest with Adjustable Cone Alignment - Patent Fig. 21
Fig. 21 - Operational state: Small hole aligned.

Drawings reproduced from the public patent document for reference.

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  1. ✓ Patent vetted China-only family and legal status checked
  2. 2 Product brief · now How it works, uses and options written up
  3. 3 Prototype First samples for buyers to review
  4. 4 Pilot run Small first batch for launch customers
  5. 5 Volume production Repeat orders at scale

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This page is based on the public patent document CN112590435B, assigned to Individual. IP2M is an independent manufacturing service and is not affiliated with, endorsed by or licensed by the patent owner. Images marked as concept renderings are illustrations, not photos of an existing product. Patent status information is provided for reference only and is not legal advice; confirm freedom to operate for your market before production. Full disclaimer.