B - Operations – Transporting – 27 – B
Patent
B - Operations, Transporting
27
B
144/27, 143/7
B27B 17/00 (2006.01) A01G 23/00 (2006.01) B27B 1/00 (2006.01) B27B 17/06 (2006.01)
Patent
CA 1200735
ABSTRACT OF THE DISCLOSURE Cutting of a horizontal, cantilevering object of splittable material, such as a de-barked tree trunk or the like, is carried out with the aid of a guided, endless circulating saw chain, an upper cutting part of which is moved from below and upwardly through the object. The lower edge portions of the cut surfaces at the cut are allowed to bear against each other under the action of the bending moment of the cantilevering object, while the return portion of the saw chain in the cutting area is kept free from the cut surfaces. The saw chain is guided by a chain guide extending curvilinearly under the object and guiding the return part of the chain. The chain guide and the guided return part are both outside and below the object during the whole of the cutting operation, while the upper cutting portion of the chain runs straight between the end points of the curved portion of the chain guide. Towards the end of the cutting operation, the part of the object not yet sawn through is subjected solely to short- duration tensional stress and substantially not to bending stress, whereby splitting the material is avoided.
430747
Hedin Jan-Erik
Lindblom Thore
Wickstrom Sven
G. Ronald Bell & Associates
Ostbergs Fabriks Ab
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