1. An arrow broadhead adapted for attaching to an open end of a hollow arrow shaft, the broadhead adapted for moving from a retracted position to an extended position when contacting a target, the broadhead comprising:
a sliding shaft having a pointed tip, said pointed tip formed in a front portion of said shaft, said pointed tip tapered rearwardly and outwardly forming a tip base;
at least two cutting blades pivotally attached to said tip base, said blades including an outer cutting edge and an inner edge, the inner edge of said blades including a beveled cam surface;
a hollow collar for receiving a portion of said sliding shaft therethrough; and
a sliding shaft housing having a bore hole therein and a threaded lower end, said hollow collar attached to a side of said bore hole, a lower end portion of said sliding shaft received in said bore hole, said threaded lower end of said sliding shaft housing adapted for receipt inside the open end of the hollow arrow shaft;
whereby, when said pointed tip contacts a target, said sliding shaft moves inwardly through said hollow collar and into said bore hole and the beveled cam surface of said blades contacts a portion of a side of said hollow collar and moves said blades outwardly from a folded, retracted position into an extended position.
2. The broadhead as described in claim 1 wherein said bore hole of said sliding shaft housing includes a threaded upper end in a collar bore hole and a smaller sliding shaft bore hole below said collar bore hole, said hollow collar attached to the threaded upper end of said sliding shaft housing, a lower end portion of said sliding shaft received in said sliding shaft bore hole.
3. The broadhead as described in claim 1 further including a round hollow arrow shaft insert adapted for receipt in the open end of the arrow shaft, the threaded lower end of said sliding shaft housing attached to said arrow shaft insert.
4. The broadhead as described in claim 1 further including three cutting blades equally spaced around a circumference of said tip base and pinned inside grooves in the side of said tip base.
5. The broadhead as described in claim 1 further including a blade retaining band received in an outer notch in said blades, said band for holding said blades in a folded, retracted position during arrow flight.
6. The broadhead as described in claim 1 wherein a portion of said sliding shaft includes an annular groove therein for receiving a ring keeper, said ring keeper preventing said sliding shaft from being removed from said hollow collar.
7. An arrow broadhead adapted for attaching to an open end of a hollow arrow shaft, the broadhead adapted for moving from a reacted position to an extended position when contacting a target, the broadhead comprising:
a sliding shaft having a pointed tip, said pointed tip formed in a front portion of said shaft, said pointed tip tapered rearwardly and outwardly forming a tip base, said tip base having grooves formed therein and parallel to a length of said sliding shaft;
at least two cutting blades, said grooves in said tip base used for receiving a pivot end of said cutting blades, the pivot end of said cutting blades pinned to sides of said grooves, said blades including an outer cutting edge and an inner edge, the inner edge of said blades including a beveled cam surface;
a hollow collar for receiving a portion of said sliding shaft therethrough; and
a sliding shaft housing having an interior threaded upper end in a collar bore hole, a sliding shaft lower bore hole below said collar bore hole and an exterior threaded lower end, said hollow collar attached to the threaded upper end of said sliding shaft housing, a lower end portion of said sliding shaft received in said sliding shaft bore hole, said threaded lower end of said sliding shaft housing adapted for receipt inside the open end of the hollow arrow shaft;
whereby, when said pointed tip contacts a target, said sliding shaft moves inwardly through said hollow collar and into said sliding shaft lower bore hole and said beveled cam surface contacts a portion of a side of said hollow collar and moves said blades outwardly from a folded, retracted position into an extended position.
8. The broadhead as described in claim 7 further including a round hollow arrow shaft insert adapted for receipt in the open end of the arrow shaft, said exterior threaded lower end of said sliding shaft housing attached to said arrow shaft insert.
9. The broadhead as described in claim 7 further including three cutting blades equally spaced around a circumference of said tip base and pinned inside grooves in the side of said tip base.
10. The broadhead as described in claim 7 further including a blade retaining band received in an outer notch in said three blades, said band for holding said blades in a folded, retracted position during arrow flight.
11. The broadhead as described in claim 7 wherein a portion of said sliding shaft includes an annular groove therein for receiving a ring keeper, said ring keeper preventing said sliding shaft from being removed from said hollow collar.
12. An arrow broadhead adapted for attaching to an open end of a hollow arrow shaft, the broadhead also adapted for moving from a folded, retracted position to an extended position when contacting a target, the broadhead comprising:
a sliding shaft having a pointed tip, said pointed tip formed in a front portion of said shaft, said pointed tip tapered rearwardly and outwardly forming a tip base;
at least two cutting blades pivotally attached to said tip base, said blades including an outer cutting edge and an inner edge, the inner edge of said blades including a beveled cam surface;
an arrow shaft insert adapted for receipt in the open end of the hollow arrow shaft; and
a hollow collar received inside said arrow shaft insert, a lower end portion of said sliding shaft slidably received inside said hollow collar and the open end of the hollow arrow shaft;
whereby, when said pointed tip contacts the target, said sliding shaft moves inwardly through said hollow collar and the beveled cam surface of said blades contacts a portion of a side of said hollow collar, the beveled cam surface moving said blades outwardly from the folded, retracted position next to a length of said shaft into the extended position.
13. The broadhead as described in claim 12 further including three cutting blades equally spaced around a circumference of said tip base and pinned thereto.
14. The broadhead as described in claim 12 further including a blade retaining means received on said blades for holding said blades in a folded, retracted position during arrow flight.
15. The broadhead as described in claim 14 wherein said blade retaining means is a rubber band received around a rearward portion of said blades.
16. The broadhead as described in claim 12 wherein a rear portion of said sliding shaft includes an annular groove therein for receiving a ring keeper, said ring keeper preventing said sliding shaft from being removed from said collar.
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. An active power factor pre-converter having a rectified AC voltage input from a mains AC power supply and a DC output voltage, the pre-converter comprising adjustment means to adjust automatically, in operation, the DC output voltage as a function of the rectified AC voltage input, wherein the active power factor pre-converter is connected to a main power supply converter and the main power supply converter produces synchronisation pulses which ensure that a transistor switch of the active power factor pre-converter is OFF during the period when a transistor switch of the main power supply converter is ON.
2. An active power factor pre-converter according to claim 1, wherein the means to adjust the DC output voltage includes means to sample the rectified AC voltage input and the DC output voltage.
3. An active power factor pre-converter according to claim 1, wherein the adjustment means adjusts the DC output voltage to a lower threshold value if the rectified AC voltage input falls below a predetermined value.
4. An active power factor pre-converter according to claim 1, wherein die adjustment means adjusts the DC output voltage to an upper threshold if the rectified AC voltage input rises above a predetermined value.
5. An active power factor pre-converter according to claim 1, wherein the adjustment means adjusts the DC output voltage to track the rectified AC voltage input.
6. An active power factor pre-converter according to claim 5, wherein the adjustment means adjusts the DC output voltage to a level a fixed amount greater than the rectified AC voltage input.
7. An active power factor pre-converter according to claim 6, wherein the fixed amount is between 0 and 15% of the amplitude of the rectified mains voltage.
8. An active power factor pre-converter according to claim 1, wherein the active power factor pre-converter is disabled when synchronisation pulses from the main power supply converter cease.
9. An active power factor pre-converter according to claim 8, wherein an auxiliary converter is still operable to take power from the mains AC power supply when the active power factor pre-converter is disabled.
10. A method of active power factor correction comprising:
connecting an active power factor pre-converter to a main supply converter; of
automatically adjusting a DC output voltage of the active power factor pre-converter as a function of a rectified AC voltage input to the pre-converter; and
producing synchronisation pulses in the main power supply converter which ensure that a transistor switch of the active power factor pre-converter is OFF during the period when a transistor switch of the main power supply converter is ON.