Dart flight rotation shaft and flight rotation shaft assembly

• US 4,978,130 A
• Filed: 10/14/1986
• Issued: 12/18/1990
• Est. Priority Date: 05/29/1986
• Status: Expired due to Term

• Current Assignee: Dynastar, LLC
• Original Assignee: Charles W. Farler
• Inventors: Farler, Charles W.
• Primary Examiner(s): SHAPIRO, PAUL
• Application Number:
  US06/918,719
• Time in Patent Office: 1,526 Days
• Field of Search: 273/423, 273/416, 273/419, 273/420, 403/165
• US Class Current: 473/586
• CPC Class Codes: F42B 6/003 Darts

Abstract

A dart flight rotation shaft and dart flight rotation shaft assembly. The dart flight rotation shaft is preferably, but not necessarily, integral and comprised of a cylindrical forward portion preferably, but not necessarily, uniform of substantially uniform diameter, and a flight mating portion having an outer diameter having one or more portion(s) of larger extension and/or smaller recess diameter than its remaining portion(s) to enable it to mate at such portion(s) in a slip-fit with one or more respectively smaller and/or larger inner diameter cavity portion(s) of a dart flight.

The dart flight rotation shaft assembly is comprised of the foregoing dart flight rotation shaft on which there is mounted a snap-on, rotatable flight comprised of a flight bushing tube located along the central axis of said flight, a plurality of vanes or fins equally spaced around said flight bushing tube and an axial cavity those inner diameter has a respective smaller and/or larger diameter portion(s) whose distance(s) and shape conform substantially to those respectively larger and/or smaller diameter portion(s) on the mating portion of said flight shaft to cause a slip-fit union therewith permitting said flight to rotate around said shaft. The flight rotation shaft and flight rotation shaft assembly are characterized in that no portion of said flight rotation shaft attachment is external to any external surface of said flight.

Claims

1. A dart shaft-flight assembly comprised of a non-rotating dart flight shaft and a rotatable snap on readily removable dart flight, having a central axis, attached thereto, said shaft having a cylindrical forward portion and a flight mating portion readily separable from said snap-on, readily removable, attached dart flight said dart flight further comprised of a flight bushing tube located along the central axis of said flight, a plurality of vanes or fins equally spaced around said flight bushing tube and an axial cavity whose inner diameter has one or more respective recess(es) and/or extension(s) whose distance(s) and shape conform substantially to respective extension(s) and/or recess(es) on a flight attachment means of said shaft flight mating portion yet leave a gap or a space therebetween permitting said flight to be free to rotate, clockwise or counter-clockwise, around such shaft;

wherein said shaft flight mating portion has a means of attachment to said flight around which said flight can rotate freely, clockwise or counter-clockwise, said shaft attachment means having an outer diameter with one or more portions of larger, diameter (extension) and/or smaller diameter (recess) than its remaining portion(s) to enable it to mate at such extension(s) and/or recess(es); and

wherein said shaft-flight assembly is characterized in that no portion of said shaft flight attachment means is external to any external surface of said flight.

2. A dart shaft-flight assembly as in claim 1 wherein said flight bushing tube contains a flight axial bore tube located in the forward portion thereof.

3. A dart shaft-flight assembly as in claim 1 wherein said vanes or fins are integral with said flight bushing tube.

4. A dart shaft-flight assembly as in claim 1 wherein said vanes or fins and said flight bushing tube are plastic.

5. A dart shaft-flight assembly as in claim 1 wherein said shaft forward portion is attached to a threaded front portion adapter for attachment to a dart body rearward portion having mating threads.