Woodworking – Process – Mechanical cutting or shaping
Patent
1998-07-21
1999-11-02
Bray, W. Donald
Woodworking
Process
Mechanical cutting or shaping
1441621, 144176, 144180, 241 92, B27L 1100, B27C 700
Patent
active
059751690
ABSTRACT:
A method and a feeding chute for feeding logs (10) into a disc chipper by means of the gravity. The logs (10) are supported laterally by means of adjacent bottom portions (31, 32) of the chute (3) and shoulders between those. The logs are turned parallel with the longitudinal direction of the chute by means of a moment (M) which occurs when the direction of the main axis (27) of the ellipse forming the shearing surface of the log deviates from the direction (27') perpendicular to a the direct line (30) drawn via the rotating center (28) of the blade disc and the center (29) of the ellipse. The bottom portions (31, 32) of the chute are inclined around a longitudinal axis in such a way that from two adjacent bottom portions of the chute, the one (31) further away from the rotating axis of the disc forms a bigger angle (.beta.') with respect to the horizontal plane than the angle (.beta.") formed by the portion (32) closer to the rotating axis.
REFERENCES:
patent: 3392763 (1968-07-01), Ledergerber
patent: 5139063 (1992-08-01), Nettles et al.
patent: 5261469 (1993-11-01), Severson
patent: 5293917 (1994-03-01), Kalliokoski
patent: 5417263 (1995-05-01), Jorgensen
patent: 5660218 (1997-08-01), Jonkka
Jonkka Arvo
Tahkanen Hannu
Tohkala Antti
Bray W. Donald
Sunds Defibrator Woodhanding Oy
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