Frosting dispenser with removable and washable cartridge assembly and cartridge assembly filling disk and filling method

A dispenser for flowable material, comprising:

• a cartridge assembly for retaining flowable material, said cartridge assembly comprising a dispensing piston sealingly and slidably retained within a cylinder, said cylinder having a distal cylinder dispensing end to which a material passing attachment can be sealingly mounted and having a proximal cylinder mounting end, and the piston comprising a piston head for creating a slidable seal within said cylinder and rack means with a series of rack gear teeth along its length and connected to and protruding proximally from said piston;
• a drive structure for engaging and mounting said cartridge assembly and for progressively driving the flowable material out of said cartridge assembly and onto a target surface, said drive structure comprising a cartridge assembly engagement structure and having a piston drive mechanism which drivably and releasibly engages said piston rack means upon fitting said cylinder into said engagement structure, for driving said piston distally to dispense the flowable material out of said cartridge assembly through said cylinder dispensing end;
• a material passing attachment which is at least one of:
• a nozzle comprising a nozzle dispensing opening, and an annular filling disk comprising a circular panel with a material passing disk opening and a tubular flange connected to said circular panel and encompassing said material passing disk opening for fitting onto said cylinder dispensing end, said tubular flange comprising a disk stop structure within and connected to said tubular flange.

A method of delivering flowable material into a cartridge assembly of a dispenser, where the dispenser comprises a plurality of interchangeable cartridge assemblies for retaining flowable material, each cartridge assembly comprising a dispensing piston sealingly and slidably retained within a cylinder, the cylinder having a distal cylinder dispensing end to which a material passing attachment can be sealingly mounted and having a proximal cylinder mounting end, and the piston comprising a piston head for creating a slidable seal within the cylinder and piston drive means connected to the piston;

• a drive structure for engaging and mounting the cartridge assembly and for progressively driving the flowable material out of the cartridge assembly and onto a target surface, the drive structure comprising a cartridge assembly engagement structure and having a piston drive mechanism which drivably and releasibly engages the piston drive means upon fitting the cylinder to the engagement structure, for driving the piston distally to dispense the flowable material out of the cartridge assembly through the cylinder dispensing end;
• using a material passing attachment comprising a filling disk comprising an annular filling disk having a circular panel with a material passing disk opening at its center and a tubular flange connected to said circular panel and encompassing said material passing disk opening for fitting onto the distal cylinder dispensing end, comprising the steps of:
• fitting the filling disk to the cylinder dispensing end;
• inserting the disk into the open top of a can of flowable material flat against the exposed surface of the material;
• and pressing the cartridge assembly and attached said filling disk downwardly against the material in the can and thereby driving the material into the cylinder.

A dispenser for flowable material, comprising:

• a cartridge assembly for retaining flowable material, said cartridge assembly comprising a dispensing piston sealingly and slidably retained within a cylinder, the cylinder having a distal cylinder dispensing end to which a material passing attachment can be sealingly mounted and having a proximal cylinder mounting end with a proximally extending cartridge assembly mounting protrusion, and the piston including a piston head for creating a slidable seal within the cylinder and a rack comprising a slat with a series of rack gear teeth along its length and connected to and protruding proximally from the piston out of the cylinder and along to the cartridge assembly mounting protrusion;
• and a drive structure for engaging and mounting said cartridge assembly and progressively driving the flowable material out of said cartridge assembly and onto a target surface, said drive structure comprising a cartridge assembly engagement structure and having a channel distal end and a channel proximal end, said channel containing a piston drive mechanism which drivably and releasibly engages said piston rack upon fitting said cylinder into said channel, for driving said piston distally to dispense the flowable material out of said cartridge assembly through said cylinder dispensing end;
• wherein said drive structure comprises a cross-sectionally arched channel having inwardly angled engagement portions spaced such that the cylinder can be forcibly passed between the engagement portions into or out of the channel against resilient biasing provided by the engagement portions;
• wherein said piston drive mechanism comprises an electric drive motor having a rotational direction mounted within said channel proximal end and electrically connected through a dispenser circuit to a power source, said drive motor having a motor drive shaft drivably connected to a speed reducing gear train which in turn drives a pinion gear, said pinion gear drivably engaging said rack gear teeth on said rack upon mounting of said cartridge assembly to said drive structure;
• wherein said power source comprises a battery mounted within said channel;
• spaced apart and laterally extending first and second motor retaining walls in the channel, wherein said drive motor is retained between said first and second motor retaining walls;
• and a drive mechanism cover removably fitting over said motor and said battery and removably connected to said channel;
• wherein said dispenser circuit comprises an actuation switch;
• wherein said actuation switch comprises speed selection switch settings;
• wherein said circuit comprises automatic piston reversing means for momentarily reversing the flow of electric current through said motor to reverse the rotational direction of said motor.