Joint for connecting wood members

• US 6,551,007 B2
• Filed: 06/28/2001
• Issued: 04/22/2003
• Est. Priority Date: 08/01/2000
• Status: Expired due to Fees

• Current Assignee: United States Department Of Health And Human Services (Government of the United States of America)
• Original Assignee: United States Department Of Agriculture
• Inventors: Erickson, John R., Ross, Robert, Lichtenberg, Gary J., Flach, Dwight
• Primary Examiner(s): Browne, Lynne H.
• Assistant Examiner(s): COTTINGHAM, JOHN R
• Application Number:
  US09/892,236
• Publication Number:
  US 20020034416A1
• Time in Patent Office: 663 Days
• Field of Search: 403/270, 403/271, 403/272, 403/267, 403/268
• US Class Current: 403/270
• CPC Class Codes: B27D 1/10 Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting see also B27M3/002 and B27M3/0026
• CPC Class Codes: B27F 1/16 Making finger joints, i.e. joints having tapers in the opposite direction to those of dovetail joints B27F1/08 takes precedence
• CPC Class Codes: B27M 3/002 characterised by oblong elements connected at their ends B27M3/006 takes precedence
• CPC Class Codes: B32B 21/00 Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
• CPC Class Codes: F16B 11/006 by gluing gluing of plastics material B29C65/48
• CPC Class Codes: Y10T 403/473 Socket or open cup for bonding material
• CPC Class Codes: Y10T 403/477 Fusion bond, e.g., weld, etc.

Abstract

A self-centering and self-aligning joint is presented for bonding a first and second wood segment, wherein the joint includes a single tenon extending from the end face of the first segment, and a void disposed within the end face of the second segment. And adhesive is applied to the outer surface of the tenon, or to the inner surface of the void to join the two segments.

Claims

1. A joint for bonding a first axially extending wood segment presenting a first end face to a second axially extending wood segment presenting a second end face, the joint comprising:

a single protrusion extending axially outwardly from the first end face and centered on the first end face, said protrusion having a smooth surface;

a single void defined by an inner wall of the second wood segment, wherein the void has a smooth surface, extends axially inwardly from the second end face and is centered with respect to the second end face, and wherein the void is sized to receive the protrusion therein; and

an adhesive disposed at an interface between the protrusion and the inner wall of the second wood segment to join the first and second wood segments together.

2. The joint as recited in claim 1, wherein the protrusion comprises a frusto-conical member disposed proximal the first end face and an arc-shaped tip integrally connected to a distal surface of the frusto-conical member.

3. The joint as recited in claim 2, wherein the void further comprises a frusto-conical void disposed proximal the second end face and an arc-shaped void integral with frusto-conical void and disposed adjacent a distal surface of the frusto-conical void.

4. The joint as recited in claim 3, wherein the frusto-conical member has a mouth of a diameter smaller than the mouth of the frusto-conical void to produce a first gap disposed at the interface between the first and second end faces.

5. The joint as recited in claim 4, wherein the adhesive comprises a liquid adhesive prior to curing that is disposed in the first gap to bond the first and second wood segments.

6. The joint as recited in claim 3, wherein the arc-shaped tip and the arc-shaped void is formed from a first and second sphere, respectively, and wherein the first sphere has a radius greater than the second sphere to produce a gap disposed adjacent an interface between the arc-shaped tip and the inner wall of the second wood segment.

7. The joint as recited in claim 6, wherein the second gap forms a pocket sized to receive the adhesive that bonds the first and second wood segments.

8. The joint as recited in claim 7, wherein the adhesive is a liquid adhesive prior to curing.

9. The joint as recited in claim 3, wherein frusto-conical member and the frusto-conical void present outer walls that form the same angle with respect to the axial direction.

10. The joint as recited in claim 1, wherein the first and second wood segments have one of a round, oval, and rectangular cross-section.

11. A method for producing a joint operable to bond a first axially extending wood segment presenting a first end face to a second axially extending wood segment presenting a second end face, the method comprising the steps of:

(a) forming a single protrusion with a smooth surface that extends axially outwardly from the first end face and centered on the first end face;

(b) forming a single void defined by an inner wall of the second wood segment, wherein the void has a smooth surface and extends axially inwardly from second end face and is centered with respect to the second end face, and wherein the void is sized to receive the protrusion therein; and

(c) depositing an adhesive at an interface between the protrusion and the inner wall of the second wood segment to join the first and second wood segments together.

12. The method as recited in claim 11, wherein step (a) is performed using a cutter presenting at least one helical flute disposed on its outer surface.

13. The method as recited in claim 11, wherein step (b) is performed using a cutter presenting at least one helical flute disposed on its outer surface.