Tree harvester
AssigneeL & L Logging Research Limited
InventorJoseph Lucien Levesque
Life of this patent
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Abstract
The following specification discloses a tree harvesting apparatus controlled from a light weight tracked vehicle having a rotatable platform for holding a boom apparatus to which a harvester head is hingeably attached. The harvester head comprises shearing means and delimbing knives mounted to a support member which can be positioned by the boom against a tree to be severed and then rotated into a horizontal position for the delimbing and severing of a tree into bolts in proximity and to the side of the control vehicle.
Claims4
In a tree harvester of the class comprising a tree cutting and delimbing unit which first severs a tree trunk after effecting a gripping embrace of the tree and then draws the trunk through the unit to effect delimbing, a plurality of trunk gripping pulling-rollers effecting said draw, characterised in that said rollers have gripping surfaces which are longitudinally and circumferentially concave relative to their rotary axes, said delimbing unit including at least two trunk-holding arms at least partially embracing said trunk, and a delimbing knife attached to at least one of said arms for movement therewith, said delimbing knife having a concave inner surface, said rollers being so journalled between the ends of said arms as to span the same.
A tree harvester having generally linear support means and tree holding, cutting and delimbing means projecting from said support means, including arms adapted and designed to embrace said tree over surface portions of said tree which are on the side remote from said support means, means operatively associated with said arms for moving said tree longitudinally, and means in the form of at least one axially angulated circumferentially concavely conical and truncated positioning roller adapted and designed partially to embrace said tree over the side area thereof which is closest to said support means, an axial plane of said roller co-inciding with the horizontal axis of said means for moving said tree whereby, as viewed in plan, said tree is seen to be embraced over spaced surface portions around it's circumference, for maintaining said tree substantially uniformly spaced from and parallel to said support means during the cutting and delimbing thereof.
Dependencies are inferred from the claim text.