Pneumatically powered pole saw

A pneumatic valve assembly with a trigger for switching the pneumatic valve assembly between two or more valve operation modes, the valve operational modes are determined by selection of fluid conduits by a trigger valve assembly of the pneumatic valve assembly which interconnects fluid conduits to a main valve, pilot valves and a pneumatic cylinder of a fluid powered pole saw and wherein a piston located in the pneumatic cylinder is mechanically coupled to a cutting blade of the pole saw and the trigger is operatively coupled to the trigger valve assembly.

A method of manually triggering a configuration of valves between pneumatic pilot valves and main valves which control the flow of compressed fluid to a pneumatic cylinder of a pneumatically powered pole saw, the method comprising the steps of: actuating a trigger valve assembly via a trigger such that a pneumatically driven blade of the pole saw is held in a fully extended position with respect to the pole saw when reciprocating motion of the pole saw piston is deactivated; and biasing a shuttle of the pole saw to a position corresponding to the fully extended position of the blade when the shuttle is not in the position when reciprocating motion of the pole saw piston is deactivated.

A pneumatically powered pole saw comprising:na pole;a cutting blade movably mounted to the pole;a piston slidably received within a piston chamber of the pole;a piston rod coupling to the cutting blade to the piston; anda pneumatic valve assembly with a trigger for switching between two or more valve operation modes, the valve operational modes are determined by selection of fluid conduits by a trigger valve assembly which interconnects fluid conduits to a main valve, pilot valves and a pneumatic cylinder of the pole saw and wherein valves of the trigger valve assembly are configured to provide a static state, held to one extreme position of the piston wherein the cutting blade is held in a fully extended position with respect to the pole saw.