Projectile with an extendable boattail
US4674706A · kind A · utility
Inventor
Key dates
| Filing date | Feb 21, 1986 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Feb 21, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42B10/44
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A projectile having a streamline assembly which includes a frusto-conical saddle secured to the boattail area of the projectile bullet, a carrying cylinder having one end secured to the saddle, with multiple, concentrically oriented, tapered, collapsible rings normally located inside the opposite end of the carrying cylinder and biased against a pressure disk fitted against the opposite end of the carrying cylinder, wherein firing of the projectile causes the pressure disk to tear away from the carrying cylinder and deploy the collapsible rings outwardly of the carrying cylinder and behind the bullet in a "beehive" configuration, to reduce air resistance as the projectile moves through the atmosphere. In a preferred embodiment the pressure disk is pressed against the carrying cylinder by means of a brass screw, the threads of which engage an aperture in the saddle and are stripped from the brass screw to release the disk when the projectile is fired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.