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US Forest Service Research & Development
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  • US Forest Service Research & Development
  • 1400 Independence Ave., SW
  • Washington, D.C. 20250-0003
  • 800-832-1355
You are here: Home / Publications & Products / Patents / Patented Technologies / Wood Connectors / Concentric Finger Jointed Timber

Concentric Finger Jointed Timber

Concentric Finger Joint

Patent Status

Patent Number: 6,537,625

Date Issued: March 25, 2003

Technology Description

This invention is a means of joining timber with a round cross-section. By utilizing fingers that are cut concentric with the round wooden members being joined, rather than using conventional, straight-cut fingers, this invention overcomes the limitations of the conventional finger joint. The concentric finger joint, by contrast, has improved strength, particularly at the outer portions of the joint where the stresses are greatest. Further, the concentric joint provides a more aesthetically pleasing joint, with less joint seam exposed. Finally, the increased reliability of the concentric joint allows the utilization and joining of smaller diameter timber, making previously unusable timber available.

Potential Commercial Uses

This technology offers a method of joining timber in which the joint is more aesthetically pleasing, has improved strength, and may also be used with smaller diameter timber. Has potential applications in the logging industry.

Licensees and/or industrial cooperators are being sought for this invention.

Inventor/Project Leader

Robert J. Ross