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US 4,541,636 AGranted
Fluid pressurized arrow shaft for archery arrows
OwnerStanley A. Humphreyinventor
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OwnerStanley A. Humphreyinventor
Estimating the term…
An archery arrow having an elongated hollow shaft with a nock mounted on the rear end thereof and a front end that mounts an internally threaded broadhead or arrow point insert. An arrow broadhead or point is threaded into the insert bore to extend forwardly of the shaft while a rubber seal member is mounted by the insert to extend rearwardly thereof and within the shaft. The nock and insert are in fluid sealing relationship with the shaft while the seal member, nock and shaft define a fluid chamber extending between the nock and seal member. The seal member permits a needle point being extended thereinto to permit pressurized fluid passing into the above mentioned chamber. In the first and third embodiments the needle point extends axially through the seal member while in the second embodiment the needle point is extended only part of the axial distance through the seal member so that the fluid flows through cross passages to an annular chamber bound by the seal member and shaft and then axially between adjacent surface parts of the shaft and seal member to pressurize the shaft rearwardly of the seal member. In each of the embodiments, the pressurization of the shaft makes the shaft more rigid and thereby less subject to bending.
An archery arrow having an axially elongated hollow shaft that has a central axis of elongation, a front end and a rear end, a nock mounted on the shaft rear end in fluid sealing relationship therewith, an arrow point, an insert mounted by the shaft front end to extend therein in fluid sealing relationship therewith for removably mounting the arrow point to extend forwardly of the shaft, said insert having a bore extending axially therethrough and opening to the shaft interior, and a resilient fluid seal member mounted in the shaft adjacent to the insert for in combination with the shaft and the nock define a first gas chamber that extends at least a major portion of the length of the shaft for retaining gas under a higher pressure than atmospheric pressure in the chamber and permitting selectively applying gas under pressure to flow into said chamber to increase the fluid pressure in the chamber.
The arrow of claim further characterized in that the seal member is made of rubber and is joined to the insert to extend rearwardy of the insert.
The arrow of claim further characterized in that the shaft has an inner peripheral wall, and that the seal member has an axially rearwardly cylindrical portion resiliently, yieldably maintained in fluid sealing relationship with the shaft inner peripheral wall.
An archery arrow having an axially elongated hollow shaft that has a central axis of elongation, an inner peripheral wall, a front end and a rear end, a nock mounted on the shaft rear end in fluid sealing relationship therewith to close the the rear end of the shaft, an arrow point, and first means mounted by the shaft front end to extend thereinto for removably mounting the point of the shaft to extend forwardly thereof and form a fluid seal with the shaft to selectively permit the shaft being pressurized with a gas to a pressure higher than atmospheric pressure and when pressurized retain the shaft in a pressurized condition.
An archery arrow adapted to be pressurized by a needle connected to a source of gas under pressure and having a needle point, comprising an axially elongated hollow arrow shaft having a central axis of elongation, an inner peripheral wall, and opposite ends, nock means mounted on one end of the shaft and arrow point means mounted on the other end of said shaft, said nock means and arrow point means in combination with the shaft forming a closed pressurizable chamber extending at least the major portion of the axial length of the shaft, one of said means including a seal member extending in the respective end of the shaft to form a fluid seal therewith to permit the needle point being extended at least partially therethrough to permit said chamber being pressurized above atmospheric pressure with a gas and after the chamber is pressurized and the needle point is withdrawn prevent pressurized gas escaping from said chamber.
Dependencies are inferred from the claim text.