IP Library › Granted Patent US 12,370,731
Granted Patent B2
US 12,370,731 · App. 18/456,797 · Granted Jul 29, 2025

Reinforced wood fiber core and method of making thereof

Inventor: Randolph A Dunn (Wilton, NH)
Assignee: Souhegan Wood Products Inc.
B29C48/0021B29C48/0022B29C48/09B29C63/18B65H75/10B29C2793/0063B29C2793/009B65H2401/10
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Quick Facts
Patent No.
US 12,370,731
App. No.
18/456,797
Granted
Jul 29, 2025
Kind
B2
Abstract

A winding core with improved beam and hoop strength and diminished friability and method for manufacturing such a core are provided, the method for making the winding core comprising: providing a wood fiber core, applying an adhesive to the wood fiber core, and sliding a tube or sheath onto the wood fiber core.

Claims (23)

1. A method for manufacturing a winding core, said method comprising:

providing an extruded wood fiber core member having an external diameter;

applying an expanding adhesive to said extruded wood fiber core member; and

sliding a sheath over said extruded wood fiber core member.

2. The method of claim 1 further comprising:

clamping said sheath to said extruded wood fiber core member and allowing said adhesive to cure.

3. The method of claim 1 further comprising:

cutting a longitudinal notch into said wood fiber core member and said sheath.

4. The method of claim 1 further comprising:

affixing end caps and plates to said wood fiber core member and said sheath.

5. The method of claim 4 further comprising:

applying a finish to an exterior surface of said sheath.

6. The method of claim 1 further comprising:

applying a finish to an exterior surface of said sheath.

7. The method of claim 1 wherein said sliding of the sheath over said extruded wood fiber core member uses an un-split tube.

8. The method of claim 1 wherein said wood fiber core has a square internal bore.

9. The method of claim 1 wherein said extruded wood fiber core has an internal bore having a circular cross section.

10. The method of claim 1 wherein said extruded wood fiber core has an internal bore having a squircle cross section.

11. The method of claim 1 wherein said sheath that is slid over the extruded wood fiber core member is longitudinally uncut.

12. The method of claim 1 further comprising using a mechanical mechanism to force said sheath to slide over said core member in the lengthwise direction of the sheath.

13. The method of claim 12 wherein said mechanical mechanism is a filament wrapped in a spiral configuration around said core.

14. The method of claim 12 wherein said mechanical mechanism is a ram configured to apply a force in the lengthwise direction of the sheath to cause relative sliding between the sheath and the extruded wood fiber core.

15. The method of claim 12 wherein said mechanical mechanism is pressurized air disposed between said sheath and said core.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 8, 2023
From: DUNN, RANDOLPH A
To: SOUHEGAN WOOD PRODUCTS INC.
Reel/Frame 065808/0996 →
Continuity (3)
Continuation 16993465 · Aug 14, 2020
Provisional Application 62886569 · Aug 14, 2019
Related Publication 20230405904A1 · Dec 21, 2023
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