Abstract In a separable mortar round of the type having a central cartridge chamberithin the boom portion and provided with a plurality of flash holes extending outwardly of the chamber that improvement, which includes an adhesively bonded thin stainless steel foil disposed about the inner wall of the chamber and closing over the flash holes to provide increased liquid impermeability. The method of applying the aforesaid foil to the chamber wall by wrapping a foil on a hollow mandrel having a plurality of surface openings and applying a vacuum to said mandrel while simultaneously wrapping the foil thereabout. Coating both the foil and the inner chamber wall with an adhesive and inserting said mandrel into the separated boom for aligned disposition in the chamber. Thereafter gaseously sealing the mandrel in the chamber, releasing the vacuum, applying positive pressure to the mandrel and removing the same from the chamber. The invention described herein may be manufactured, used and licensed by or for the Government for governmental purposes without the payment to us of any royalty thereon.
An apparatus for adhesively bonding a metallic foil with the cartridge chamber of a separable mortar shell having flash holes which comprises: a support for fixedly holding a mandrel means, a cradle for holding said mortar shell, a pin disposed in and extending out of said cradle for engagement in one of said flash holes, fixedly held guide means for supporting said shell cradle for movement toward and from said mandrel means in alignment for insertion of said mandrel means into said chamber, said mandrel means including: a hollow perforated mandrel having its interior communicating with an inlet port, and sealing means for providing a gaseous seal between said shell and said mandrel when said shell is disposed on said cradle and said mandrel is disposed within said chamber, whereby said mandrel may be evacuated to retain thereabout an adhesively coated metallic foil, inserted into said chamber, and thereafter have positive pressure applied to blow out said foil against the wall of said chamber.
Claim 2
Independent Claim
164 words
An apparatus for adhesively bonding a metallic foil with the cartridge chamber of a separable mortar shell having flash holes which comprises: a support for fixedly holding a mandrel means, a cradle for holding said mortar shell, a pin disposed in and extending out of said cradle for engagement in one of said flash holes, fixedly held guide means for supporting said shell cradle for movement toward and from said mandrel means in alignment for insertion of said mandrel means into said chamber, said mandrel means including: a hollow perforated mandrel having its interior communicating with an inlet port, and sealing means for providing a gaseous seal between said shell and said mandrel when said shell is disposed on said cradle and said mandrel is disposed within said chamber, whereby said mandrel may be evacuated to retain thereabout an adhesively coated metallic foil, inserted into said chamber, and thereafter have positive pressure applied to blow out said foil against the wall of said chamber.