Arrow shaft end adaptor apparatus and balance pin apparatus and method

• US 4,944,520 A
• Filed: 09/26/1988
• Issued: 07/31/1990
• Est. Priority Date: 09/29/1987
• Status: Expired due to Fees

• Current Assignee: Strongwell Corporation
• Original Assignee: AFC, Inc.
• Inventors: Nelson, Bruce A., Carlson, Dennis L., Eickhoff, Robert D., Fingerson, Conrad F.
• Primary Examiner(s): SHAPIRO, PAUL
• Application Number:
  US07/248,216
• Time in Patent Office: 673 Days
• Field of Search: 273/416, 273/418-423
• US Class Current: 473/582
• CPC Class Codes: F42B 6/04 Archery arrows F42B6/08, F41B5/06, F42B12/362 take precedence

Abstract

An arrow and method of making it. The arrow has a hollow arrow shaft, a single piece adaptor having one end with an outer diameter and a cylindrical bore with an inner surface adhesively engageable about a first end of the shaft and an externally threaded opposite end. An inclined surface surrounds the externally threaded end and tapers inwardly from the outer diameter of the one end towards the bore. The inclined surface has a diameter greater than that of the external threads. The external threads and inclined surface receive and retain an arrow point with internal threads and inclined surface so that impact forces are not transmitted to the inner surface of the shaft. A balance pin has a shaft portion received in the arrow shaft, and a head portion interconnected to one end of the balance pin shaft portion. The head portion has a diameter greater than the shaft portion outer diameter and smaller than the inner diameter of the cylindrical bore. The method comprises the steps of: providing the end adapter and balance pin, inserting the balance pin shaft portion in the shaft opening until the balance pin head portion abuts the arrow shaft, adhesively engaging a portion of the inner surface of the adaptor bore with the outer surface of the shaft, threading an arrow point with an inclined surface on the externally threaded end of the adaptor, and contacting the inclined surface of the outer surface of the inclined point with the inclined surface of the adaptor.

Claims

1. An arrow, comprising:

(a) a hollow circular arrow shaft having a first end and a second end and an opening with an inner surface defined therethrough,

(b) a single piece end adaptor for operative engagement to said hollow circular arrow shaft, said end adaptor having;

a cylindrical body having a ferrule end and an externally threaded end,

said ferrule end having an outer diameter and a cylindrical bore with a continuous inner surface defined upwardly therein, the inner surface of said bore adhesively engageable about a portion of the first end of the circular arrow shaft;

said externally threaded end opposite said ferrule end having constant pitch and constant diameter external threads defined thereabout, and an inclined surface defined in a circular manner about the intersection of said ferrule end and said externally threaded end, said inclined surface tapered inward from said outer diameter of said ferrule end towards said bore of said ferrule end, said inclined surface having an inner diameter greater than the diameter of the constant diameter external threads, said external threads and said inclined surface formed to threadedly receive and retain an arrow point with cooperating constant pitch and constant diameter internal threads and inclined surface so that impact forces from the arrow point are not transmitted to the inner surface of said circular arrow shaft, and

(c) a balance pin having a shaft portion with an outer diameter smaller than said opening defined through said arrow shaft, said balance pin shaft portion being received in a portion of said opening of said arrow shaft; and

a head portion interconnected to one end of said balance pin shaft portion having a diameter greater than said balance pin shaft portion outer diameter, said balance pin head portion diameter being smaller than the inner diameter of said first ferrule end.

2. A method of making an arrow comprising the steps of:

providing a hollow circular shaft having a first end and a second end and an opening with an inner surface defined therethrough,

providing a single piece end adaptor having;

a ferrule end with an outer diameter and a cylindrical bore with a continuous inner surface defined upwardly therein, the inner surface of said bore adhesively engageable about a portion of the first end of said hollow circular shaft; and

an externally threaded end opposite said ferrule end, said externally threaded end having;

constant pitch and constant diameter external threads defined therabout, and

an inclined surface defined in a circular manner about the intersection of said ferrule end and said externally threaded end, said inclined surface tapered inward from said outer diameter of said ferrule end towards said bore of said ferrule end, said inclined surface having an inner diameter greater than the diameter of the constant diameter external threads, said external threads and said inclined surface formed to threadedly receive and retain an arrow point with cooperating constant pitch and constant diameter internal threads and inclined surface so that impact forces from the arrow point are not transmitted to the inner surface of said circular shaft,

providing a balance pin having a shaft portion with an outer diameter smaller than said opening defined through said arrow shaft, said balance pin shaft portion sized to be inserted into a portion of said arrow shaft opening, and a head portion interconnected to one end of said balance pin shaft portion having a diameter greater than said balance pin shaft portion outer diameter, said balance pin head portion diameter being smaller than the inner diameter of said first ferrule end,

inserting said balance pin shaft portion in said arrow shaft opening until said balance pin head portion abuts said arrow shaft first end,

adhesively engaging a portion of said inner surface of said bore of said ferrule end to the outer surface of said first end of said hollow circular shaft,

threading an arrow point having an inclined surface on the externally threaded end of said end adaptor, and

contacting said inclined surface of said arrow point with said inclined surface of said externally threaded end.