The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2002
Filed:
Nov. 02, 1999
Stig Johnsson, Karlskoga, SE;
Bofors Defence Aktiebolag, Karlskoga, SE;
Abstract
The present invention relates to a method and a device relating to shells with deployable fins and which are fired from large caliber guns into ballistic trajectories, for preventing the propellant gas pressure in the barrel during firing from directly or indirectly deforming the said fins ( ). The type of fins that the present invention primarily relates to are those that are deployed on command in order to fin-stabilize the shell. Usually such fins are protected prior to deployment by an ejectable fin protector ( ). To prevent this fin protector from being deformed and consequently impeding fin deployment or degrading fin functionality, the present invention proposes that all unoccupied space inside the said fin protector be filled with an inert, noncombustible, non-glutinous substance ( ) of low compressibility and very low inherent strength. This substance, which completely fills the space inside the fin protector around the fins ( ), will detach from the fins after fin deployment as a result of mainly centrifugal forces, but until that point in time will effectively prevent all undesirable deformation of the fin protector and thereby indirectly of the fins. Until ejected the fin protector ( ) is thus fully sealed.