1. A pole-attached power tool system, comprising:
a pole having a first end, a second end, and an interior region, wherein a longitudinal axis of the pole defines a longitudinal direction;
a handle disposed proximate to the first end of the pole;
a gear box disposed proximate to the first end of the pole;
an electric motor disposed proximate to the first end of the pole, wherein the electric motor is disposed between the handle and the gearbox in the longitudinal direction, and wherein the gearbox is disposed between the first end of the pole and the handle in the longitudinal direction;
a power tool disposed proximate to the second end of the pole; and
a drive member disposed within the interior region, the drive member mechanically coupled with the electric motor and the power tool to transfer power generated by the electric motor to the power tool.
2. The pole-attached power tool system of claim 1, wherein a center of gravity of the pole-attached power tool system is located between the electric motor and the power tool in a direction of the longitudinal axis of the pole.
3. (canceled)
4. The pole-attached power tool system of claim 1, wherein a center of gravity of the pole-attached power tool system is located between the gear box and the power tool in a direction of the longitudinal axis of the pole.
5. The pole-attached power tool system of claim 1, wherein the electric motor is disposed within an interior region of a handle housing, wherein the handle housing includes the handle.
6. The pole-attached power tool system of claim 1, further comprising:
a switch, operable by a user of the pole-attached power tool system to control actuation of the power tool, disposed proximate to the electric motor.
7. The pole-attached power tool system of claim 1, wherein the pole-attached power tool system has:
a first end of the pole-attached power tool system proximate to the first end of the pole,
a second end of the pole-attached power tool system proximate to the second end of the pole,
a longitudinal length measured between the first and second ends of the pole-attached power tool system parallel to the longitudinal axis of the pole, and
a center of gravity located less than approximately \u2156 of the longitudinal length from the first end of the pole-attached power tool system.
8. The pole-attached power tool system of claim 7, wherein the center of gravity is located less than approximately 720 of the longitudinal length from the first end of the pole-attached power tool system.
9. (canceled)
10. The pole-attached power tool system of claim 1, wherein the electric motor is an AC motor.
11. The pole-attached power tool system of claim 1, wherein the power tool comprises a saw.
12. The pole-attached power tool system of claim 1, wherein the power tool has a first end and a second end, the first end of the power tool is closer to the first end of the pole than the second end of the power tool is to the first end of the pole, the electric motor has a first end and a second end, the first end of the electric motor is closer to the second end of the pole than the second end of the electric motor is to the second end of the pole, and a dimension, measured between the first end of the power tool and the first end of the electric motor, is greater than approximately 20 inches.
13. The pole-attached power tool system of claim 12, wherein the dimension is greater than approximately 40 inches.
14. The pole-attached power tool system of claim 1, wherein the pole-attached power tool system does not comprise a liquid fuel tank.
15. The pole-attached power tool system of claim 1, wherein the pole is reversibly extendable.
16-23. (canceled)
24. The pole-attached power tool system of claim 1, wherein the handle comprises multiple regions configured to be gripped by a user, wherein the multiple regions are spaced apart in the longitudinal direction.
25. A method for manufacturing a pole-attached power tool system, comprising:
providing a handle proximate to a first end of a pole, wherein a longitudinal axis of the pole defines a longitudinal direction;
providing a gearbox proximate to the first end of the pole;
providing an electric motor proximate to the first end of the pole, wherein the electric motor is disposed between the handle and the gearbox in the longitudinal direction, and wherein the gearbox is disposed between the first end of the pole and the handle in the longitudinal direction;
providing a power tool proximate to a second end of the pole; and
providing a drive member within an interior region of the pole, wherein the drive member is mechanically coupled with the electric motor and the power tool to transfer power generated by the electric motor to the power tool.
26-27. (canceled)
28. The method of claim 25, wherein providing the electric motor proximate to the first end of the pole comprises providing the electric motor in an interior region of a handle housing, wherein the handle housing includes the handle.
29. The method of claim 25, wherein a center of gravity of the power tool system is located between the electric motor and the power tool.
30. The method of claim 25, wherein the power tool system has a first end proximate to the first end of the pole, a second end proximate to the second end of the pole, and a longitudinal length measured between the first end and the second end of the power tool system, and wherein a center of gravity of the power tool system is located less than approximately half of the longitudinal length from the first end of the power tool system.
31. The method of claim 25, wherein the power tool and the electric motor are separated by a distance greater than approximately 12 inches.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fuel injection system for an internal combustion engine, comprising:
a fuel reservoir; and
at least one reciprocating fuel pump assembly in fluid communication with the fuel reservoir, each of the at least one reciprocating fuel pump assemblies comprising:
a housing assembly including a drive section and an adjacent pump section;
a drive assembly disposed in the drive section, the drive assembly including a permanent magnet having a first magnetic field and a coil assembly having a winding;
one of the magnet and the coil assembly being capable of reciprocal movement along an axis between a first position and a second position with respect to the other, the one forming, at least in part, a movable member;
a controller capable of generating a first and a second signal;
application to the winding of the first signal having a first polarity and a first amplitude generating a second magnetic field interacting with the first magnetic field to control movement of the movable member between the first position and the second position;
application to the winding of the second signal having a second polarity and a second amplitude generating a third magnetic field interacting with the first magnetic field to control movement of the movable member between the second position and the first position;
the first polarity being opposite to the second polarity, the first and second signals being independently alterable as a function of engine demand;
a resilient member biasing the movable member in the first position; and
a pump assembly disposed in the pump section, the pump assembly including a pump member capable of reciprocal movement, the pump member operatively connected to the movable member, movement of the movable member causing movement of the pump member.
2. The fuel injection system of claim 1, further comprising:
a first fuel pump for drawing fuel from the fuel reservoir;
a separator for receiving fuel from the first fuel pump; and
a second fuel pump for drawing fuel from the separator,
each of the at least one reciprocating fuel pump assemblies receiving fuel from the second fuel pump.
3. The fuel injection system of claim 2, further comprising:
an inlet manifold receiving fuel from the second fuel pump, each of the at least one reciprocating fuel pump assemblies drawing fuel from the inlet manifold; and
a return manifold for returning excess fuel from each of the at least one reciprocating fuel pump assemblies to the separator.
4. The fuel injection system of claim 1, wherein the at least one reciprocating fuel pump assembly comprises a plurality of reciprocating fuel pump assemblies.
5. The fuel injection system of claim 1, further comprising an injection controller to control the operation of the at least one reciprocating fuel pump assembly.
6. The fuel injection system of claim 1, wherein the coil assembly surrounds the permanent magnet.
7. The fuel injection system of claim 1, wherein the movable member includes the coil assembly.
8. The fuel injection system of claim 1, wherein the permanent magnet comprises two permanent magnets.
9. The fuel injection system of claim 1, wherein each of the at least one reciprocating fuel pump assemblies further comprises a nozzle in fluid communication with the pump assembly for expressing pressurized fluid from the pump assembly.
10. The fuel injection system of claim 1, wherein the movable member and the pump member move in the same direction.
11. The fuel injection system of claim 1, wherein the movable member contacts the pump member, forcing the pump member against the bias of the resilient member.
12. The fuel injection system of claim 1, further comprising:
a pump chamber formed in the pump section, the pump chamber having a side wall; and
a fluid inlet passage disposed in the side wall of the pump chamber.
13. The fuel injection system of claim 1, further comprising:
a fixed member formed at least in part by the other of the magnet and the coil assembly;
the movable member moving away from the fixed member when moving from the first position to the second position.
14. An internal combustion engine, comprising:
at least one combustion chamber; and
a fuel injection system having a reciprocating fuel pump assembly associated with the combustion chamber to inject fuel therein;
the reciprocating fuel pump assembly comprising:
a housing assembly including a drive section and an adjacent pump section;
a drive assembly disposed in the drive section, the drive assembly including a permanent magnet having a first magnetic field and a coil assembly having a winding;
one of the magnet and the coil assembly being capable of reciprocal movement along an axis between a first position and a second position with respect to the other, the one forming, at least in part, a movable member;
a controller capable of generating a first and a second signal;
application to the winding of the first signal having a first polarity and a first amplitude generating a second magnetic field interacting with the first magnetic field to control movement of the movable member between the first position and the second position;
application to the winding of the second signal having a second polarity and a second amplitude generating a third magnetic field interacting with the first magnetic field to control movement of the movable member between the second position and the first position;
the first polarity being opposite to the second polarity;
the first and second signals being independently alterable as a function of engine demand;
a resilient member biasing the movable member in the first position; and
a pump assembly disposed in the pump section, the pump assembly including a pump member capable of reciprocal movement, the pump member operatively connected to the movable member, movement of the movable member causing movement of the pump member.
15. The internal combustion engine of claim 14, wherein the at least one combustion chamber comprises a plurality of combustion chambers, and
wherein the fuel injection system has a plurality of reciprocating fuel pump assemblies, each of the fuel pump assemblies being associated with a combustion chamber.
16. The internal combustion engine of claim 14, wherein the movable member and the pump member move in the same direction.
17. The internal combustion engine of claim 14, further comprising;
a pump chamber formed in the pump section, the pump chamber having a side wall; and
a fluid inlet passage disposed in the side wall of the pump chamber.
18. The internal combustion engine of claim 14, further comprising:
a fixed member formed at least in part by the other of the magnet and the coil assembly;
the movable member moving away from the fixed member when moving from the first position to the second position.