초록

A new sawing arrangement and a new attachment for use in such an arrangement. An elongated rigid power train is interposed between the power unit and the cutting head of a chain saw. It is secured to and chain driven by the former, and to it the latter is secured in driving relation.

대표청구항 ▼

In combination with a chain saw, having a power unit including a first driving sprocket wheel, a cutter head including an endless cutter chain for directly engaging said first driving sprocket wheel, and means removably mounting said cutter head on said power unit so that said cutter chain extends f

In combination with a chain saw, having a power unit including a first driving sprocket wheel, a cutter head including an endless cutter chain for directly engaging said first driving sprocket wheel, and means removably mounting said cutter head on said power unit so that said cutter chain extends from said power unit in a predetermined direction, a rigid elongated interconnecting power train for interposition between said power unit and said cutter head to provide an extended working position for said cutter head relative to said power unit, said power train comprising an elongated rigid tubular member; a power shaft in two longitudinally separable parts traversing said tubular member and carried in bearings in the ends thereof for rotating therein about an axis; means at one end of said tubular member for connecting said tubular member to said power unit for drive and support thereby, including a first housing configured for supportive connection to said power unit instead of said cutter head, means connecting said first housing to said tubular member and preventing relative rotation therebetween about the axis of said power shaft, a first stub shaft projecting from said first housing in a direction orthogonal to said axis and carried in bearings in said first housing, a driving connection in said first housing from said first stub shaft to said power shaft, a driven sprocket wheel carried on said first stub shaft outside said first housing for alignment with said first driving sprocket wheel, and an endless driving chain for conducting power from said first driving sprocket wheel to said first driven sprocket wheel; means at the other end of said cutter head for connecting said tubular member to said cutter head for drive and support thereof instead of said power unit, including a second housing configured for supportive connection of said cutter head, means connecting said second housing to said tubular member and preventing relative rotation therebetween about said axis of said power shaft, a second stub shaft projecting from said second housing in a direction orthogonal to said axis and carried in bearings in said second housing, a driving connection in said second housing from said power shaft to said second stub shaft, and a second driving sprocket wheel carried on said second stub shaft outside said second housing for alignment with said cutter chain, said first and second housings being so oriented with respect to said tubular member that when said interconnecting power train is interposed between said power unit and said cutter head, said endless cutter chain has the same general direction as said endless drive chain, and said axis of said power shaft is skewed at large acute angles with respect thereto, said second housing further including a nose located beside said cutter chain in the extended working position of said cutter head and having a surface substantially orthogonal to said tubular member and extending laterally beyond said cutting chain for a portion of the length thereof for cooperation with said tubular member to comprise a rest for supporting said power train on a branch to be cut, while said cutter chain is in operation, without causing cutting of the branch; and rigid brace means connected at one end at an acute angle to said tubular member near said second housing, and adapted for rigid connection to said power unit at a location displaced from the connection thereto of said first housing, for maintaining the orientation of said interconnecting power train with respect to said power unit.