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
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.
대표청구항▼
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 cylinde
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; anda blade operatively coupled to the piston rod. 2. The pneumatically powered pole saw of claim 1, wherein the fluid configured to flow into and out of the cylinder is compressed gas. 3. The pneumatically powered pole saw of claim 1, wherein the valve functions as a pilot valve to actuate a larger fluid flow control valve. 4. The pneumatically powered pole saw according to claim 1, wherein axial movement of the piston rod moves the shuttle between the first position and the second position. 5. The pneumatically powered pole saw according to claim 1, further comprising: a first biasing mechanism and a spring holder positioned adjacent the shuttle within the internal void, wherein when the shuttle is in the second position, the first biasing mechanism is at least partially compressed between the spring holder and the shuttle. 6. The pneumatically powered pole saw according to claim 1, further comprising at least one o-ring configured to seal the chamber. 7. The pneumatically powered pole saw according to claim 1, further comprising at least one elastomeric diaphragm configured to seal the chamber. 8. The pneumatically powered pole saw according to claim 1, wherein the piston rod includes a biasing member adjacent a free end, the biasing member being in contact with the shuttle and applying a force thereto when the shuttle is in the second position. 9. The pneumatically powered pole saw according to claim 1, wherein the cylinder includes a vent hole configured to reduce backpressure within the cylinder. 10. The pneumatically powered pole saw as in claim 1, wherein the cylinder is coupled the piston chamber by a threaded engagement between the cylinder and the piston chamber. 11. The pneumatically powered pole saw as in claim 1, wherein the piston rod of the piston chamber extends completely through the cylinder. 12. The pneumatically powered pole saw according to claim 11, wherein axial movement of the piston rod moves the shuttle between the first position and the second position. 13. A pneumatically powered pole saw, comprising: a pilot valve assembly for actuating the pneumatically powered pole saw, the pilot valve assembly having a generally hollow cylinder coupled and axially aligned with a piston chamber of the pole saw, the piston chamber having a piston movably received therein and the piston is coupled to a piston rod which moves as the piston is moved within the piston chamber, wherein the piston is operatively coupled to a blade of the pole saw and wherein the generally hollow cylinder defines an internal void that extends 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; andwherein the pilot valve assembly further comprises a shuttle arranged within the internal void of the cylinder, the shuttle being slidable between a first position and a second position around the piston rod, wherein the piston rod is axially aligned with and extends completely through the cylinder, 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. 14. A method of operating a pneumatically powered pole saw, comprising: axially aligning a pilot valve assembly with a piston chamber of the pole saw, the piston chamber having a piston movably received therein and the piston is coupled to a piston rod which moves as the piston is moved within the piston chamber, wherein the piston rod is operatively coupled to a blade of the pole saw and wherein the pilot valve assembly has a generally hollow cylinder coupled to and axially aligned with piston chamber, wherein the generally hollow cylinder defines an internal void that extends 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; andwherein the pilot valve assembly further comprises a shuttle arranged within the internal void of the cylinder, the shuttle being slidable between a first position and a second position around the piston rod, wherein the piston rod is axially aligned with and extends completely through the cylinder, and 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. 15. The method as in claim 14, wherein axial movement of the piston rod moves the shuttle between the first position and the second position.
Kelley Ronald J. ; Pratt Steven D. ; Landreth Bobby Dean ; Pennisi Robert W. ; Muthuswamy Sivakumar ; Urbish Glenn F., Portable fuel cell power supply.
Riera Salvatore J. (61801 Cetnor Washington MI 48094) Thorn Brent A. (23090 Halsted ; Apt. 208 Farmington Hills MI 48035), Power driven hose clamp tool.
van der Merwe Jacobus C. (801 Beechwood Dr. Kingsport TN 37663) van der Merwe Lucas C. (801 Beechwood Dr. Kingsport TN 37663), Vehicle with telescopic boom for power driven plant trimming tools.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.