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US 8,939,052 B2Granted
Pneumatically powered pole saw
OwnerRonald Alan Gatteninventor
Life of this patent
Estimating the term…
Abstract
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.
Claims20
A pneumatically powered pole saw comprising:
- a 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;
- 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;
- a first pilot valve configured to send actuating gas through a conduit to the main valves assembly, the actuating gas of the first pilot valve actuating the gas actuated valves of the main valves assembly to the first position, wherein movement of the main valves to the first position releases a portion of a source of gas into the piston chamber on one side of the piston while venting the opposite side of the piston chamber, and when the main valves assembly is in the first position the cutting blade to moves in a first cutting direction towards a limit of travel in the first cutting direction;
- and
- a second pilot valve configured to send actuating gas through a conduit to the main valves assembly when the limit of travel in the first cutting direction has been reached, the actuating gas of the second pilot valve causes the main valves to be moved to the second position, wherein movement of the main valves to the second position releases another portion of compressed gas into the piston chamber on the opposite side of the piston chamber and venting the one side of the piston chamber, wherein the cutting blade moves in an opposite second cutting direction with respect to the first cutting direction until a limit of travel in the second cutting direction is reached wherein the first pilot valve is again actuated and the cutting blade moves again in the first cutting direction until the limit of travel in the first cutting direction is reached.
5 more elements
A pneumatically powered pole saw, comprising:
- an extendable pole;
- a cutting blade movably mounted to the extendable pole;
- a piston linked to the cutting blade, the piston being slidably received within a piston chamber of the pneumatically powered pole saw;
- a reciprocating valve operably coupled to the pneumatically powered pole saw, the reciprocating valve being configured for movement between a first position and a second position wherein the reciprocating valve releases a portion of a source of compressed gas into the piston chamber on one side of the piston when the reciprocating valve is in the first position causing the cutting blade to move in a first cutting direction towards a limit of travel in the first cutting direction and a first check valve provides fluid communication to the piston chamber on another side of the piston causing the reciprocating valve to move from the first position towards the second position, when the cutting blade reaches the limit of travel in the first direction, the reciprocating valve releases another portion of the source of compressed gas into the piston chamber on the another side of the piston when the reciprocating valve is in the second position causing the cutting blade to move in a second cutting direction opposite to the first cutting direction and towards a limit of travel in the second cutting direction and a second check valve provides fluid communication to the piston chamber on the one side of the piston, the reciprocating valve moving from the second position towards the first position when the cutting blade reaches a limit of travel in the second direction.
1 more element
A pneumatic valve assembly, comprising:
- a piston slidably received within a piston chamber;
- a piston rod coupled to the piston;
- 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;
- a first pilot valve configured to send actuating gas through a conduit to the main valves assembly, the actuating gas of the first pilot valve actuating the gas actuated valves of the main valves assembly to the first position, wherein movement of the main valves to the first position releases a portion of a source of gas into the piston chamber on one side of the piston while venting the opposite side of the piston chamber, and when the main valves assembly is in the first position the piston rod moves in a first direction towards a limit of travel in the first direction;
- a second pilot valve configured to send actuating gas through a conduit to the main valves assembly when the limit of travel in the first direction has been reached, the actuating gas of the second pilot valve causes the main valves to be moved to the second position, wherein movement of the main valves to the second position releases another portion of compressed gas into the piston chamber on the opposite side of the piston chamber and venting the one side of the piston chamber, wherein the piston rod moves in an opposite second direction with respect to the first direction until a limit of travel in the second direction is reached wherein the first pilot valve is again actuated and the piston rod moves again in the first direction until the limit of travel in the first direction is reached;
- and
- wherein the first pilot valve and the second pilot valve are each configured to be actuated via movement of the piston rod.
4 more elements
A method for pneumatically powering a pole saw, comprising:
- slidably mounting a piston in a piston chamber for movement between a first position and a second position;
- and
- moving a reciprocating valve fluidly coupled to the piston chamber, wherein the reciprocating valve is configured for movement between a first position and a second position wherein the reciprocating valve releases a portion of a source of compressed gas into the piston chamber on one side of the piston when the reciprocating valve is in the first position causing the piston to move in a first direction towards a limit of travel in the first direction and a first check valve provides fluid communication to the piston chamber on another side of the piston causing the reciprocating valve to move from the first position towards the second position, when the piston reaches the limit of travel in the first direction, the reciprocating valve releases another portion of the source of compressed gas into the piston chamber on the another side of the piston when the reciprocating valve is in the second position causing the piston to move in a second direction opposite to the first cutting direction and towards a limit of travel in the second direction and a second check valve provides fluid communication to the piston chamber on the one side of the piston, the reciprocating valve moving from the second position towards the first position when the piston reaches a limit of travel in the second direction, wherein movement of the piston between the limits of travel in the first and second directions causes the reciprocating valve to move between the first position and the second position.
A compressed gas switching pneumatic valve assembly, comprising:
- an outer pneumatic chamber;
- and
- a slidably received gas sealed valve member within the outer pneumatic chamber, wherein an internal void extends from one side of the outer pneumatic chamber to another side of the outer pneumatic chamber, the internal void being configured to allow axial location of an pneumatic valve assembly around an axially located piston rod of a pneumatic piston chamber, the pneumatic valve assembly further comprising at least fluid paths to provide switchable fluid flow into and out of the outer pneumatic chamber when the slidably received valve member is externally actuated to change a position within the outer pneumatic chamber.
Dependencies are inferred from the claim text.