1. A device including a separable unit and arranged to be fired from a rifled barrel, said device comprising in combination: a shell casing containing an ignitable gas generating charge and a projectile fitted into an open end of the shell casing to impart a longitudinal and rotary acceleration to the device by gas pressure generated by ignition of the charge in the shell casing, said projectile being hollow and open at its end facing the shell casing for accommodating in the projectile a unit arranged to be separated from the projectile through the open end thereof a predetermined period of time after firing of the projectile, a container slidably fitted into said projectile and open at its end adjacent to the open end of the projectile, said container being arranged to separate into several parts on removal from the projectile through the open end thereof and including said unit and further including a brake means responsive to a centrifugal force for activation, activation of the braking means reducing the rotational speed of the unit; a bottom member for closing the open end of the container and also the open end of the projectile; connecting means connecting said bottom member for releasably retaining said bottom member on the container pivotal between a closing position in which the lengthwise center axis of the bottom member coincides with the lengthwise center axis of the container and a release position in which the bottom member is laterally displaced relative to the container axis, said connecting means including a pivot means and a receiving means therefor on the unit and the bottom member respectively, said receiving means retaining the bottom member when in said closing position but freeing it for separation from the unit when in said release position; and timing and expelling means for expelling the container from the projectile a predetermined period of time after firing of the projectile, expulsion of the container freeing said braking means for activation by the centrifugal force to cause slowing of the rotational speed of the unit and causing said bottom member to be pivoted by the centrifugal force out of its closing position into its release position in which it separates itself from the pivot means and is laterally ejected out of the linear path of the unit.

1. A device including a separable unit and arranged to be fired from a rifled barrel, said device comprising in combination: a shell casing containing an ignitable gas generating charge and a projectile fitted into an open end of the shell casing to impart a longitudinal and rotary acceleration to the device by gas pressure generated by ignition of the charge in the shell casing, said projectile being hollow and open at its end facing the shell casing for accommodating in the projectile a unit arranged to be separated from the projectile through the open end thereof a predetermined period of time after firing of the projectile, a container slidably fitted into said projectile and open at its end adjacent to the open end of the projectile, said container being arranged to separate into several parts on removal from the projectile through the open end thereof and including said unit and further including a brake means responsive to a centrifugal force for activation, activation of the braking means reducing the rotational speed of the unit; a bottom member for closing the open end of the container and also the open end of the projectile; connecting means connecting said bottom member for releasably retaining said bottom member on the container pivotal between a closing position in which the lengthwise center axis of the bottom member coincides with the lengthwise center axis of the container and a release position in which the bottom member is laterally displaced relative to the container axis, said connecting means including a pivot means and a receiving means therefor on the unit and the bottom member respectively, said receiving means retaining the bottom member when in said closing position but freeing it for separation from the unit when in said release position; and timing and expelling means for expelling the container from the projectile a predetermined period of time after firing of the projectile, expulsion of the container freeing said braking means for activation by the centrifugal force to cause slowing of the rotational speed of the unit and causing said bottom member to be pivoted by the centrifugal force out of its closing position into its release position in which it separates itself from the pivot means and is laterally ejected out of the linear path of the unit.