IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0448340
(2012-04-16)
|
등록번호 |
US-8939052
(2015-01-27)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
30 |
초록
▼
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 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 seco
1. 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; anda 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. 2. The pneumatically powered pole saw of claim 1, wherein the piston rod is connected to the cutting blade via a connecting rod. 3. The pneumatically powered pole saw of claim 1, wherein a pair of springs are located on the piston rod to impart opposite forces on the first pilot valve and the second pilot valve as the cutting blade moves between the limit of travel in the first and second cutting directions. 4. The pneumatic pole saw of claim 1, wherein main valves assembly is located within the pole and the main valves assembly is axially located around the piston rod and wherein the piston rod is slidably received within the main valves assembly. 5. The pneumatic pole saw of claim 1, wherein cutting blade teeth of the cutting blade are predominantly angled towards the first cutting direction. 6. The pneumatic pole saw of claim 1, wherein rotatable bearings are located between a support and a guide blade of the pole saw, the guide blade being secured to the cutting blade and the piston rod and the support being secured to the pole. 7. The pneumatic pole saw of claim 1, wherein a thickness of the cutting blade from cutting teeth to a top of blade, is variable. 8. The pneumatic pole saw of claim 1, further comprising a limb stop mounted to the pole. 9. The pneumatic pole saw of claim 1 wherein a roller is mounted at an end of the pole to support and guide the cutting blade. 10. The pneumatic pole saw of claim 1 wherein a manually operated pilot valve is located on the pole to enable an operator control of the source of gas into the main valves assembly. 11. 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. 12. 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; andwherein the first pilot valve and the second pilot valve are each configured to be actuated via movement of the piston rod. 13. The pneumatic valve assembly as in claim 12, wherein the main valves assembly, the first pilot valve and the second pilot valve are each configured to be slidably received within a housing secured to the piston chamber. 14. The pneumatic valve assembly as in claim 12, wherein the piston rod extends from either end of the piston chamber and the main valves assembly comprises a first main valve and a second main valve. 15. The pneumatic valve assembly as in claim 13, wherein the piston chamber and the housing are axially aligned in a cylindrical item. 16. The pneumatic valve assembly as in claim 15, wherein the cylindrical item is a pole of a pole saw. 17. 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; andmoving 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. 18. A compressed gas switching pneumatic valve assembly, comprising: an outer pneumatic chamber; anda 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. 19. The pneumatically powered pole saw of claim 1, wherein movement of the piston in the first direction stores potential energy in a spring attached to the cutting blade and the pole, wherein the potential energy when released forces the cutting blade in the second direction and wherein the potential energy is release when the piston changes direction from the first direction to the second direction. 20. The pneumatically powered pole saw of claim 19, wherein a cable provides connection between the cutting blade and the piston rod.
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