Arrow shaft end adaptor apparatus and balance pin apparatus and method

• US 4,874,180 A
• Filed: 09/29/1987
• Issued: 10/17/1989
• Est. Priority Date: 09/29/1987
• Status: Expired due to Fees

• Current Assignee: Morrison Molded Fiber Glass Company
• Original Assignee: AFC, Inc.
• Inventors: Nelson, Bruce A., Fingerson, Conrad F., Carlson, Dennis L., Eickhoff, Robert D.
• Primary Examiner(s): SHAPIRO, PAUL
• Application Number:
  US07/102,028
• Time in Patent Office: 749 Days
• Field of Search: 273/416, 273/418-423
• US Class Current: 473/578
• CPC Class Codes: F42B 6/04 Archery arrows F42B6/08, F41B5/06, F42B12/362 take precedence

Abstract

An arrow end adaptor and a balance pin for an arrow and a method for making the same. The arrow comprising a ferrule having a large enough inner diameter to be placed over the arrow shaft, and further having an exterior threaded end whose diameter is smaller than the diameter of the arrow shaft. The point cap is designed such that an arrow point having interior threads may be attached to the exterior threaded end of the point cap. The balance pin is designed to have a head at one end that may be affixed to either a target point or a point cap and a shaft end that may be inserted into the arrow shaft.

Claims

1. A single piece end adaptor for attachment to a hollow circular arrow shaft, said arrow shaft having a first end and a second end and an opening with an inner surface defined therethrough, said single piece end adaptor comprising;

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

and 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.

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 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 engagable 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 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 shaft.

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

threading an arrow point 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.