Arrow gun with controlled retention force and barrel vibration damping
An arrow gun is provided having a controllable retention force on the arrow. By setting the retention force on the arrow, increased energy from motive compressed gas can be imparted to the arrow. The arrow gun also includes a damping coupling for reducing vibration of an unsupported length of the barrel.
1. An arrow gun using compressed gas to propel an arrow having a hollow portion, the arrow gun comprising:
(a) a receiver;
(b) an elongate barrel having a longitudinal axis, the barrel connected to the receiver at a fixed connection, the barrel having an outer diameter sized to be slidably received within the hollow portion of the arrow and terminating at a free end;
(c) a damping coupling between the receiver and the barrel, the damping coupling longitudinally spaced along the barrel from the fixed connection to be intermediate the fixed connection and the free end of the barrel; and
(d) wherein the barrel has an unsupported length of approximately 12 inches to 36 inches between the damping coupling and the free end.
2. The arrow gun of claim 1 , wherein the damping coupling is a resilient coupling.
3. The arrow gun of claim 1 , wherein the damping coupling includes at least one resilient element contacting the receiver and an outside surface of the barrel.
4. The arrow gun of claim 1 , wherein the receiver includes a barrel adapter having an aperture size to slidably receive a length of the barrel, the damping coupling extending between the barrel adapter and the barrel.
5. The arrow gun of claim 1 , wherein the fixed connection connects the receiver to the barrel.
6. The arrow gun of claim 1 , wherein the barrel has an outside diameter less than approximately 0.5 inches.
7. An arrow gun using compressed gas to propel an arrow having a hollow portion, the arrow gun comprising:
(a) a barrel sized to be received within the hollow portion of the arrow;
(b) a gripping surface having a first configuration exerting a first retention force on the arrow receiving the barrel within the hollow portion and a second configuration exerting a different second retention force on the arrow receiving the barrel within the hollow portion; and
(c) a collar moveable relative to the barrel to dispose the gripping surface between the first configuration and the second configuration.
8. The arrow gun of claim 7 , wherein the second retention force on the arrow is such that the arrow overcoming the second retention force has a kinetic energy of at least approximately 100 ft 2 lbs/s 2 in response to a firing pressure between approximately 500 psi and 5,000 psi.
9. The arrow gun of claim 7 , wherein the second retention force on the arrow is such that the arrow overcoming the second retention force has a kinetic energy of at least approximately 100 ft 2 lbs/s 2 in response to a firing pressure between approximately 500 psi and 2,000 psi.
10. The arrow gun of claim 7 , wherein the second retention force on the arrow is such that the arrow overcoming the second retention force has a velocity of at least approximately 350 feet per second to an approximately 350 grain arrow in response to a firing pressure of approximately 5,000 psi.
11. The arrow gun of claim 7 , wherein the retention force acts on an outside surface of the arrow.
12. The arrow gun of claim 7 , wherein the gripping surface is an elastic element.
13. The arrow gun of claim 7 , wherein the gripping surface is compressible.
14. The arrow gun of claim 7 , wherein the gripping surface is resilient.
15. The arrow gun of claim 7 , further comprising a barrel adapter wherein the collar is moveable relative to the barrel adapter to dispose the gripping surface between the first configuration and the second configuration.
16. The arrow gun of claim 7 , wherein the barrel has an outside diameter less than approximately 0.5 inches.
17. The arrow gun of claim 7 , wherein the barrel has an unsupported length between approximately 12 inches to 36 inches.