Double-chambered cartridge having semi-cylindrical pistons for use in a press-out gun

Claim 1

An apparatus for extruding stored fluid contents of a single cylindrical cartridge having a side wall and a longitudinal partition wall defining dual semicylindrical chambers, each chamber having corresponding closeable outlet openings and corresponding inlet openings which are closed by corresponding plungers slidably disposed therein, comprising: a cylindrical tube having an open end, a side wall adapted to slidably engage the external periphery of the cartridge in a closely fitted relation, and a closed end having an end wall; and a pair of pistons each being in the form of a semicylindrical sleeve upstanding from the end wall and disposed concentrically inside the cylindrical tube, the pistons being spaced apart defining a space therebetween, the space being coplanar with the partition wall to permit sliding of the tube longitudinally along the cartridge.

Claim 2

An apparatus for extruding stored fluid contents of a single cylindrical cartridge having a side wall and a longitudinal partition wall defining dual semicylindrical chambers, each chamber having corresponding closeable outlet openings and corresponding inlet openings which are closed by corresponding plungers slidably disposed therein, comprising: a cylindrical tube having an open end, a side wall adapted to slidably engage the external periphery of the cartridge in a closely fitted relation, and a closed end having an end wall; and a pair of pistons each being in the form of a semicylindrical sleeve upstanding from the end wall and disposed concentrically inside the cylindrical tube, the pistons being spaced apart defining a space therebetween, the space being coplanar with the partition wall to permit sliding of the tube longitudinally along the cartridge.

Claim 6

An apparatus for extruding stored fluid contents of a single cylindrical cartridge having a side wall and a longitudinal partition wall defining dual semicylindrical chambers, each chamber having corresponding closeable outlet openings and corresponding inlet openings which are closed by corresponding plungers slidably disposed therein, comprising: a cylindrical tube having an open end, a side wall adapted to slidably engage the external periphery of the cartridge in a closely fitted relation, and a closed end having an end wall; and a pair of pistons upstanding from the end wall and disposed inside the tube, the pistons being spaced apart defining a space therebetween, the space being coplanar with the partition wall to permit sliding of the tube longitudinally along the cartridge; wherein each piston is in the form of a semicylindrical sleeve disposed concentrically within the cylindrical tube; wherein the pistons are substantially equal in length and shorter than the overall length of the cylindrical tube; wherein the external diameter of the cylindrical tube is selected to fit within the dispensing body of a press-out gun and the closed end wall of the tube is adapted to engage a circular pressure plate mounted on a free end of a longitudinally displaceable piston-rod of the gun; wherein the edge of the side wall defining the open end of the cylindrical tube is bevelled inwardly to form a guide that facilitates the sliding engagement of the cylindrical tube with the cartridge; wherein each plunger is semicircular in form and includes a plurality of radial reinforcement ribs that are notched to receive the free end of a corresponding piston.

Claim 7

An apparatus for extruding stored fluid contents of a single cylindrical cartridge having a side wall and a longitudinal partition wall defining dual semicylindrical chambers, each chamber having corresponding closeable outlet openings and corresponding inlet openings which are closed by corresponding plungers slidably disposed therein, comprising: a cylindrical tube having an open end, a side wall adapted to slidably engage the external periphery of the cartridge in a closely fitted relation, and a closed end having an end wall; and a pair of pistons upstanding from the end wall and disposed inside the tube, the pistons being spaced apart defining a space therebetween, the space being coplanar with the partition wall to permit sliding of the tube longitudinally along the cartridge; wherein each piston is in the form of a semicylindrical sleeve disposed concentrically within the cylindrical tube; wherein the pistons are substantially equal in length and shorter than the overall length of the cylindrical tube; wherein the external diameter of the cylindrical tube is selected to fit within the dispensing body of a press-out gun and the closed end wall of the tube is adapted to engage a circular pressure plate mounted on a free end of a longitudinally displaceable piston-rod of the gun; wherein the edge of the side wall defining the open end of the cylindrical tube is bevelled inwardly to form a guide that facilitates the sliding engagement of the cylindrical tube with the cartridge; wherein each plunger is semicircular in form and includes a plurality of radial reinforcement ribs that are notched to receive the free end of a corresponding piston.