Extensible chain saw

Claim 2

An extended chain saw including, in combination, a. a motor unit, b. a cutting chain unit adapted for direct attachment to the motor unit, and c. interposable sectional saw extending means comprising inner and outer terminal sections which include light but rigid channel members adapted, respectively, for rigid operative attachment to the motor unit and the cutting chain unit, respectively, and to one another, each section also including pulley and belt means through which the cutting chain is driven from the motor, and lubricant conducting means through which the cutting chain is lubricated from the motor unit.

Claim 3

An extended chain saw as set forth in claim 1 in which the sectional saw extending means includes at least one intermediate section interposed between the terminal sections, said intermediate section including belt and pulley means, rigid frame means, and lubricant transmitting means interposed, respectively, between the corresponding means of the terminal sections.

Claim 4

An extended chain saw as set forth in claim 2, in which the belt and pulley means of each section includes at least an input pulley, an output pulley, a belt trained on the input and output pulleys, and belt tightening means.

Claim 5

An extended chain saw as set forth in claim 3, in which the belt tightening means of each section or unit includes a pulley engaged with one run of the belt of that section, spring means for pressing the pulley against the engaged run of the belt, and means for selectively adjusting the pressure of the pulley against such belt run.

Claim 6

An extended chain saw as set forth in claim 2 in which the connected channel members of any two successive sections or subsections must face in opposite directions, and in which any intermediate section or sections includes a pair of subsections in which the channel members of the subsections face in opposite directions, so that the outer terminal section may be connected without modification to the outer subsection of said pair in precisely the same manner and condition in which it could have been connected directly to the inner terminal section, and the inner terminal section may be connected without modification to the inner subsection of said pair in precisely the same manner and condition in which it could have been connected to the outer terminal section.

Claim 7

An extended chain saw as set forth in claim 1 in which the motor of the motor unit has an output shaft that extends transversely of the length of the extnded chain saw, and the pulley means of each extending section are mounted to turn upon axes parallel to the axis of the motor output shaft.

Claim 8

An extended chain saw as set forth in claim 2 in which the output pulley of one section and the input pulley of an adjoining section have interfitting, non-circular parts that serve both to provide an operative driving connection between the pulleys and means for spacing the pulleys from one another.