| 摘要 |
PROBLEM TO BE SOLVED: To strongly join lumbers from thinning by simple processing to also ensure durability. SOLUTION: A primary penetrator displaced toward a lumber core by external force and a secondary penetrator pressed by the primary penetrator to be displaced are obtained by dividing a standard shape. The lumber ends are compressed by both penetrators to be inserted in a lumber end joining box metallic material and expanded by the absorption of a resin antiseptic liquid, which originates from tree branches and leaves, injected from an elastic stopper, of which the thrust hole extended at the time of insertion of the lumber ends is closed when an injection needle is drawn out, to be fixed in a close contact state. An antiseptic period is renewed by periodic additional injection. COPYRIGHT: (C)2005,JPO&NCIPI
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