(57) A cartridge for dispensing a fluent substance such as a mastic or an adhesive and
which can be used either with a conventional gun or as a self-contained cartridge
comprises an elongate container (1), a piston (7) movable longitudinally within the
container for expelling substance through an outlet (5) at one end thereof, and a
nut member (14) within the container between the piston and the other end of the container.
A separate screw (20) cooperating between the nut member (14) and the piston (7) enables
the cartridge to be used as a self-contained dispenser. To prevent the nut member
(14) from being forced out of the other end of the cartridge, abutment means (19)
are provided projecting inwardly of the container wall (1) at said other end. The
abutment means (19) however project only as far as necessary to act as a stop for
the nut member (14), and leave the other end of the container (1) substantially open
and unobstructed so that the cartridge may be used in a conventional gun. In this
latter mode the nut member (14) and the piston (7) move together as a unit longitudinally
in the container (1) when dispensing substance.
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