Pneumatically powered pole saw

摘要

A pneumatically powered pole saw is provided, the pole saw having gas actuated main valves configured for movement between first positions and second positions wherein the gas actuated main valves are located in a main valves assembly fluidly coupled to the piston chamber; and a first pilot valve is configured to send actuating gas through a conduit to the main valves assembly and a second pilot valve is configured to send actuating gas through a conduit to the main valves assembly wherein the cutting blade moves in opposite directions in response to the actuating gas of the first and second pilot valves.

主权项

1. A pneumatically powered pole saw, comprising:
a fluid valve assembly having a generally hollow cylinder coupled to an axially aligned piston chamber of the pole saw, the cylinder defining an internal void extending from one side of the cylinder to another side of the cylinder, wherein the cylinder includes at least one fluid inlet path and at least one fluid outlet path; a shuttle arranged within the internal void of the cylinder, the shuttle being slidable between a first position and a second position around an axially located piston rod of the piston chamber, wherein a sealed chamber exists between a portion of the shuttle and the cylinder and when the shuttle is in the second position, the chamber is fluidly coupled to the fluid inlet path and the fluid outlet path to provide a controllable fluid flow into and out of the cylinder; and a blade operatively coupled to the piston rod.