Patent ID: 7575048

Claim:
A chemical dispensing apparatus, comprising: a housing having a bottom and a cover; a cartridge support within the housing; a rotating cartridge rotatably supported about an axis of rotation by the cartridge support, the rotating cartridge having chemical stick receptacles; an injection passage at the bottom of the housing, adapted to permit chemical sticks to pass from the housing when the rotating cartridge is rotated to bring one of the chemical stick receptacles into a chemical dispensing position in axial alignment with the injection passage; a drive system for rotating the rotating cartridge, the drive system comprising: a rotational stop; means for biasing the rotational stop into engagement with the rotating cartridge; a pneumatic cylinder having a first end and a second end, the first end being stationary relative to the housing at a point off-axis from the axis of rotation of the rotating cartridge, the second end having an engagement member, such that as the pneumatic cylinder extends, the engagement member at the second end applies a force to one of the chemical stick receptacles to overcome the biasing force acting upon the rotational stop and selectively rotate the rotating cartridge.