Small diameter crossbow bolt

• US 9,546,850 B2
• Filed: 12/02/2014
• Issued: 01/17/2017
• Est. Priority Date: 01/11/2012
• Status: Active Grant

• Current Assignee: Aldila Golf Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Aldila Golf Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Boretto, Tod Douglas
• Primary Examiner(s): RICCI, JOHN A
• Application Number:
  US14/558,291
• Publication Number:
  US 20150087450A1
• Time in Patent Office: 777 Days
• US Class Current: 1/1
• CPC Class Codes: F42B 6/02 Arrows; Crossbow bolts; Harpoons for hand-held spring or air guns
• CPC Class Codes: F42B 6/04 Archery arrows F42B6/08, F41B5/06, F42B12/362 take precedence
• CPC Class Codes: F42B 6/06 Tail ends, e.g. nocks, fletching

Abstract

A small diameter crossbow bolt includes a small diameter shaft having a leading end with an insert to receive a point. The trailing end of shaft has a nock and adjacent fletching. The insert receives a point, such as a target point, broad head, or other point known in the industry. A circumferential spacer is positioned along the shaft between the insert and nock and moved along the shaft as needed to locate the insert for a particular weight distribution, center of gravity positioning, or to separate the spacer from nock. The insert, nock, and spacer each have a diameter substantially equal to the diameter of a prior art bolt. When the diameters of the nock and spacer are equal to the diameter of a prior art bolt, the small diameter crossbow bolt of the present invention can be used interchangeably with prior art bolts without modification to the crossbow.

Claims

1. A small diameter crossbow bolt comprising:

an elongated small diameter shaft formed having a lumen and a length extending from a leading end to a trailing end; and

a circumferential spacer positioned along said elongated small diameter shaft between said leading end and said trading end, said circumferential spacer consisting of a leading taper and a trailing taper opposing said leading taper, a spacer diameter located between said leading taper and said trailing taper extending a length between said leading taper and said trailing taper wherein said leading taper and said trailing taper tapers away from said spacer diameter and said length of said circumferential spacer defines a contact band, and an axial bore extending through said circumferential spacer.

2. The small diameter crossbow bolt of claim 1, wherein said length of said circumferential spacer extends less than 5% of said length of said elongated small diameter shaft.

3. The small diameter crossbow bolt of claim 2, wherein said leading end of said elongated small diameter shaft has an insert, said insert comprises a body having an insert diameter and formed with a bore and a pin, said pin extending axially away from said body opposite said bore and is sized to be closely received within said lumen of said elongated small diameter shaft, said bore formed to accept a crossbow bolt tip.

4. The small diameter crossbow bolt of claim 3, wherein said trailing end of said elongated small diameter shaft has a nook and adjacent fletching, said nock comprises a body haying a nock diameter and formed with a bowstring channel and a pin, said pin extending from said body opposite said bowstring channel.

5. The small diameter crossbow bolt of claim 4, wherein said spacer diameter and said nock diameter are equal.

6. The small diameter crossbow bolt of claim 5 wherein spacer diameter, and said nook diameter is equal to a prior art bolt exterior diameter, and wherein the diameter of said elongated small diameter shaft is less than said spacer diameter and said nock diameter.

7. The small diameter crossbow bolt of claim 6, wherein said bore of said insert is formed with internal threads.

8. The small/ diameter crossbow bolt of claim 7, wherein said insert tapers from said insert diameter to a smaller second diameter such that a smooth transition is realized from said crossbow bolt tip along the peripheral surface to said elongated small diameter shaft.

9. The small diameter crossbow bolt of claim 8, wherein said contact band is rounded to create a smooth surface.

10. The small diameter crossbow bolt of claim 7, wherein said leading taper of said circumferential spacer is symmetrical to said trailing taper of said circumferential spacer.

11. The small diameter crossbow bolt of claim 7, wherein said leading taper of said circumferential spacer and said trailing taper of said circumferential spacer are not symmetrical.

12. The small diameter crossbow bolt of claim 7, wherein said leading taper of said circumferential spacer and said trailing taper of said circumferential spacer are nonlinear.

13. The small diameter crossbow bolt of claim 7, further comprising a low friction coating applied to said circumferential spacer.

14. The small diameter crossbow bolt of claim 7, wherein said circumferential spacer is constructed of a low friction material.

15. The small diameter crossbow bolt of claim 7, wherein said elongated small diameter shaft is formed of fiber reinforced plastic (FRP), having an outer diameter in the range of 0.220 to 0.245 inches.

16. The small diameter crossbow bolt of claim 7, wherein said elongated small diameter shaft has a rating of less than nine grains per inch.

17. The small diameter crossbow bolt of claim 4 wherein said spacer diameter, said nock diameter, and said insert diameter are equal.

18. The small diameter crossbow bolt of claim 4 wherein said spacer diameter, said nock diameter, and said insert diameter are equal to a prior art bolt exterior diameter, and wherein the diameter of said elongated small diameter shaft is less than said midpoint diameter, said nock diameter, and said insert diameter.

19. The small diameter crossbow bolt of claim 3, wherein said circumferential spacer is secured to said elongated small diameter shaft by an adhesive.