Claims
- 1. A method for making a curved array fletching from a plastic sheet comprising: bending the plastic sheet around a mandrel to a cylindrically curved shape without any abrupt fold; heating the bent plastic sheet to a softened condition while engaged with the mandrel; cooling the bent plastic sheet while engaged with the mandrel to maintain the curvature thereof; and cutting a curved arrow fletching from the curved plastic sheet.
- 2. A method as in claim 1 wherein the plastic sheet is moved through a passage in which the heating and cooling are performed with the plastic sheet bent around the mandrel.
- 3. A method as in claim 1 wherein the plastic sheet is bent to a generally tubular construction extending about the elongated direction thereof for more than 360 degrees.
- 4. A method as in claim 1 wherein the curved plastic sheet is temporarily flattened after cooling and then die stamped to cut the fletching.
- 5. A method as in claim 1, 2, 3, or 4 wherein the curved fletching is cut from the cylindrically curved plastic sheet with a foot that extends angularly to the axial direction of the cylindrical curvature.
- 6. A method for making a curved arrow fletching from sheet plastic, the method comprising: unrolling a rolled strip of sheet plastic; bending the unrolled strip into a cylindrically curved shape without any abrupt fold around a mandrel that extends through a passage; moving the curved strip through the passage; heating the curved strip to a softened condition within the passage; cooling the heated strip within the passage to maintain the curvature thereof; temporarily flattening the curved strip after movement out of the passage; and die stamping a curved fletching from the temporarily flattened strip.
- 7. A method for making a curved arrow fletching from sheet plastic, the method comprising: unrolling a rolled strip of sheet plastic; bending the unrolled strip into a cylindrically curved shape without any abrupt fold around a mandrel that extends through a passage; moving the curved strip through the passage; electrically heating the curved strip to a softened condition within the passage; fluidly cooling the heated strip within the passage to maintain the curvature thereof; temporarily flattening the curved strip after movement out of the passage; and die stamping a curved fletching from the temporarily flattened strip with a foot of the fletching extending angularly to the axial direction of cylindrical curvature of the strip.
- 8. A method as in claim 6 or 7 wherein the plastic strip is initially bent to a cylindrically curved shape of a tubular construction that extends about the axial direction thereof for more than 360 degrees in an overlapping manner, and the fletching being die stamped to a cylindrically curved shape that extends about the axial direction thereof for less than 360 degrees.
- 9. A method for making a curved arrow fletching from a plastic sheet comprising: bending the plastic sheet to a cylindrically curved shape without any abrupt fold; moving the bent plastic sheet through a passage; heating the bent plastic sheet to a softened condition within the passage; cooling the bent plastic sheet within the passage to maintain the curvature thereof; and cutting a curved arrow fletching from the curved plastic sheet.
- 10. A method as in claim 9 wherein the curved plastic sheet is temporarily flattened after cooling and then die stamped to cut the fletching.
- 11. A method as in claim 9 or 10 wherein the curved fletching is cut from the cylindrically curved plastic sheet with a foot that extends angularly to the axial direction of the cylindrical curvature.
- 12. A method for making a curved arrow fletching from sheet plastic, the method comprising: bending the sheet plastic within a passage to a cylindrically curved shape without any abrupt fold; moving the curved sheet plastic through the passage; heating the curved sheet plastic to a softened condition within the passage; cooling the curved sheet plastic within the passage to maintain the curvature thereof; temporarily flattening the curved sheet plastic after movement out of the passage; and die stamping a curved fletching from the temporarily flattened sheet plastic.
Parent Case Info
This application is a division of application Ser. No. 275,167, filed June 19, 1981, now U.S. Pat No. 4,392,654.
US Referenced Citations (22)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1599028 |
Sep 1981 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
275167 |
Jun 1981 |
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