Take-down arrow

• US 4,722,531 A
• Filed: 08/30/1982
• Issued: 02/02/1988
• Est. Priority Date: 08/30/1982
• Status: Expired due to Fees

• Current Assignee: Donald E. Schram
• Original Assignee: Donald E. Schram
• Inventors: Schram, Donald E.
• Primary Examiner(s): SHAPIRO, PAUL
• Application Number:
  US06/412,864
• Time in Patent Office: 1,982 Days
• Field of Search: 273/416, 273/419, 273/423, 273/68, 273/80 R, 403/343, 403/299, 403/296
• US Class Current: 473/578
• CPC Class Codes: F42B 6/02 Arrows; Crossbow bolts; Harpoons for hand-held spring or air guns

Abstract

A take-down hollow shaft arrow assembly having a threadedly engageable insert portion affixed within each of two portions of a hollow arrow shaft enabling an arrow to be reduced to about half of its original length for transport or storage while retaining its original flight characteristics upon reassembly. The threadedly engaged insert abutable portions are axially spaced when the hollow arrow shaft ends firmly abut. At least one-third of the length of one of the inserts extends from one shaft portion and fits snugly into the other shaft portion. An alignment cylinder provides both accurate alignment and enhanced rigidity to the reassembled arrow shaft and resists bending of the arrow shaft upon impact with a hard object.

Claims

1. A take-down arrow comprising:

a forward shaft portion having an arrowhead attached to a first end and a hollow shaft portion at an opposite second end, the extremity of said forward shaft second end being in a plane at a right angle to the longitudinal axis of said forward shaft portion;

a rearward shaft portion having a fletch attached to a first end and a hollow shaft portion at an opposite second end, the extremity of said rearward shaft second end being in a plane at a right angle to the longitudinal axis of said rearward shaft portion;

an elongated fastening insert comprising a first and a second threadedly engageable portion, each said threadedly engageable portion having an outside diameter to fit snugly within said hollow shaft portions, the engaged length of said fastening insert being at least 13 percent the combined length of said forward and rearward shaft portions, said first threadedly engageable portion secured within said forward shaft hollow shaft portion and said second threadedly engageable portion secured within said rearward shaft hollow shaft portion, the spacing of said threadedly engageable portions being such that when threadedly engaged the extremities of said forward and rearward shaft portions firmly abut each other and abutable portions of said fastening insert portions are axially spaced, and one of said threadedly engageable insert portions extends for at least one-third of its outside diameter length beyond said extremity of one of said hollow shaft portions, said extended portion fitting snugly within the other of said hollow shaft portions.

2. The take-down arrow of claim 1 wherein the engaged length of said fastening insert is about 15 to about 25 percent the length of the arrow shaft.

3. The take-down arrow of claim 1 wherein said forward and rearward shaft portions abut each other in the central one-third of the arrow shaft length.

4. The take-down arrow of claim 1 wherein one of said threadedly engageable portions comprises in sequence a male threaded end portion, a smooth shoulder portion, and a cylindrical portion, and the other of said threadedly engageable portions comprises a hollow receiving cylinder engageable with said smooth shoulder portion and a female threaded portion to threadedly engage said male threaded end portion, the outer diameter of said cylindrical portion of said one portion and the outer diameter of said other portion closely matches the inner surface of said hollow shaft portions.

5. The take-down arrow of claim 4 wherein said male threaded end portion and said smooth shoulder portion comprise one piece and said cylindrical portion comprises a second piece.

6. The take-down arrow of claim 4 wherein said one threadedly engageable portion comprises a single piece.

7. The take-down arrow of claim 1 or 4 wherein said axial space between said fastening insert abutable portions is about one-eight inch.

8. The take-down arrow of claim 1 or 4 wherein said one threadedly engageable portion extends about one-third to one-half of its outside diameter length from said one hollow shaft portion.

9. An assembled take-down hollow shaft arrow, said shaft having a forward portion having an arrowhead attached to a first end and a hollow shaft portion at an opposite second end, the extremity of said forward shaft second end being in a plane at a right angle to the longitudinal axis of said forward shaft portion and rearward shaft portion having a fletch attached to a first end and a hollow shaft portion at an opposite second end, the extremity of said rearward shaft second end being in a plane at a right angle to the longitudinal axis of said rearward shaft portion, a fastening insert joining said forward and rearward shaft portions and comprising a first and a second engaged portion, each said threadedly engaged portion having an outside diameter fitting snugly within said hollow shaft portions, the engaged length of said fastening insert being at least 13 percent the length of said take-down arrow shaft, said first threadedly engaged portion secured within said forward shaft hollow shaft portion and said second threadedly engaged portion secured within said rearward shaft hollow shaft portion, the extremities of said forward and rearward shaft portions firmly abutting each other and abutable portions of said fastening insert portions are axially spaced, and one of said threadedly engageable insert portions extending for at least one-third of its outside diameter length snugly into one of said hollow shaft portions in which it is not secured.

10. The assembled take-down arrow of claim 9 wherein the engaged length of said fastening insert is about 15 to about 25 percent the length of the arrow shaft.

11. The assembled take-down arrow of claim 9 wherein said forward and rearward shaft portions abut each other in the central one-third of the arrow shaft length.

12. The assembled take-down arrow of claim 9 wherein one of said threadedly engaged portions comprises in sequence a male threaded end portion, a smooth shoulder portion, and a cylindrical portion, and the other of said threadedly engaged portions comprises a hollow receiving cylinder engaged with said smooth shoulder portion and a female threaded portion threadedly engaged with said male threaded end portion, the outer diameter of said cylindrical portion of said one portion and the outer diameter of said other portion closely matches the inner surface of said hollow shaft portions.

13. The assembled take-down arrow of claim 12 wherein said male threaded end portion and said smooth shoulder portion comprise one piece and said cylindrical portion comprises a second piece.

14. The assembled take-down arrow of claim 12 wherein said one threadedly engageable portion comprises a single piece.

15. The assembled take-down arrow of claim 9 or 12 wherein said axial space between said fastening insert abutable portions is about one-eighth inch.

16. The assembled take-down arrow of claim 9 or 12 wherein said one threadedly engaged portion extends about one-third to one-half of its outside diameter length into said hollow shaft portion.