Global Patent Index - EP 1159610 A1

EP 1159610 A1 2001-12-05 - LOG CUTTING PROCEDURES

Title (en)

LOG CUTTING PROCEDURES

Title (de)

VERFAHREN ZUM ZERLEGEN VON HOLZBLÖCKEN

Title (fr)

PROCEDES DE COUPE DE BILLES

Publication

EP 1159610 A1 (EN)

Application

EP 99940745 A

Priority

  • NZ 9900134 W
  • NZ 33343498 A

Abstract (en)

[origin: WO0036413A1] The present invention relates to the use of a single end testing of stems of felled trees whereby by inducing a sonic wave with an impact and by reference to detected reflections and with a knowledge of the length of the stem the stiffness and/or strength characteristics of the stem or logs to be cut therefrom can be derived. A preferred procedure is a determination of the fundamental frequency f0 which relates to velocity V, the speed of longitudinal compressional motions along the stem, and L, the length of the stem, as follows: V=2Lf0. From that value V or a function of V can be derived an indicator of stiffness and/or strength. For example the modulus of elasticity (MOE) is such an indicator and can be determined by the equation MOE= rho V<2> where rho is density. For green felled timber rho can be estimated as approximating 1000 kg/m<3>.

IPC 1-7 (main, further and additional classification)

G01N 33/46; G01N 3/34; G01N 29/18

IPC 8 full level (invention and additional information)

G01N 3/34 (2006.01); G01N 33/46 (2006.01)

CPC (invention and additional information)

G01N 3/34 (2013.01); G01N 33/46 (2013.01); G01N 2203/0623 (2013.01); G01N 2291/0238 (2013.01); G01N 2291/0421 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family

WO 0036413 A1 20000622; AU 5453999 A 20000703; AU 751539 B2 20020822; CA 2360778 A1 20000622; CA 2360778 C 20080708; EP 1159610 A1 20011205; EP 1159610 A4 20030115; NZ 333434 A 19991028