Ammunition and explosives – Powder form
Reexamination Certificate
2011-04-12
2011-04-12
Bergin, James S (Department: 3641)
Ammunition and explosives
Powder form
C264S003100, C149S109600
Reexamination Certificate
active
07921777
ABSTRACT:
The present invention relates to a method and an arrangement for the production of radially perforated, cylindrical propellant tubes (1, 23, 31). The invention is based on the underlying idea that the respective propellant tube (1, 23, 31) must be fixed and centred between its own open ends and thereafter to be perforated in stages in a large number of consecutive perforation operations by means of one or more pins (13) capable of displacement in a pin die (10) relative to the propellant tube towards and at least through the major proportion of the cylindrical wall of the propellant tube. Also included in the invention is the requirement for the displacement, between each perforation operation, of the propellant tube and the pin die (10) used for the preparation operation in such a way relative to one another that the propellant tube, after a complete perforation operation, shall be covered in its entirely by perforations (32, 33, 35, 36), which lie at a predetermined e-dimension distance from one another.
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International Search Report No. PCT/SE2004/001821, dated Jan. 3, 2005, 2 pgs.
Bergin James S
Connolly Bove & Lodge & Hutz LLP
Eurenco Bofors AB
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