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2,869,468
7 8
said primer chamber and the interior of said case; a delay tube, said delay train being comprised of slow burn-
cylin<lrical spacer in the firing end of said case enclosing ing material extending from the firing end to the dis•
an empty primer discharge space into which said primer charge end of said delay tube, and a first fire layer of
is adapted to discharge through said primer discharge rapidly· igniting material between the firing end of said
opening, the walls of said spacer being provided with 5 delay train and said partition means, and an after fire
transverse openings to permit open communication be- layer of readily igniting material at the discharge end of
tween said primer discharge space and an annular space said delay train; ,a propellant charge housed in the dis~
between. the exterior of said spacer and the interior sur- charge end of said casing; and propellant wall means
faces of said case; a partition means transversely disposed transversely disposed in said casing between said after fire
in said casing and positioned against said spacer, said par- 10 layer and said propellant· charge, said propellant wall
tition means being provided with a plurality of small open- means being provided with a restricted opening for com-
ings to provide open communication between said primer munication between said delay train and said propellant
discharge space and the remainder of said casing toward ~ar~ .
the discharge end thereof; a delay train tube closely re- References Cited in the file of this patent
ceive<l in said casing and positioned at one end against 15
said partition means, sai<l tube being of re<luced diameter UNITED STATES PATENTS
toward its firing end to provide an annular space between 1,253,947 De Casanovas ___________ Jan. 15, 1918
the exterior of said delay tube and the interior wall of 1,878,498 Lewis _________________ Sept. 20, 1932
said case near said firing end; a delay train within said 2,440,579 Frazer ---------------- Apr. 27, 1948

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