Variable proportion dispenser

A variable proportion dispenser comprising:

• a housing;
• first and second variable volume containers carried by the housing;
• and
• a reciprocating drive assembly comprising:
• first and second drive stems adapted to engage the first and second variable volume containers to drive the contents of the variable volume containers therefrom;
• a sliding body slidably mounted to the housing for movement in delivery and return directions;
• a first reciprocating driver, carried by the sliding body, coupled to the first drive stem, the first reciprocating driver and the first drive stem configured so that the first reciprocating driver can move the first drive stem towards the first variable volume container only if the sliding body is moving in the delivery direction;
• means for adjusting the amount the first reciprocating driver moves the first drive stem towards the first variable volume container during the movement of the sliding body in the delivery direction;
• and
• a one-way drive device, carried by the sliding body, configured to drive the second drive stem towards the second variable volume container when the sliding body moves in the delivery direction.

A variable proportion dispenser for dispensing multiple doses of first and second flowable materials at a chosen volumetric ratio comprising:

• a housing;
• first and second variable volume containers, containing the first and second flowable materials, carried by the housing;
• a sliding body reciprocally mounted to the housing for movement parallel to an axis between first and second positions;
• first and second drive stems operably coupled to the first and second variable volume containers, the second drive stem operably coupled to the sliding body for movement parallel to the axis;
• a one-way reciprocating driver operably coupled to the first drive stem for driving the first stem towards the first variable volume container;
• a dosage adjustor adjustably mounted to the sliding body to vary the axial position of the dosage adjustor relative to the sliding body;
• the driver and the dosage adjustor having mating portions configured to drivingly couple the dosage adjustor to the driver when the sliding body is moved from the first position to the second position, and to permit the dosage adjustor to be decoupled from the driver when the sliding body is at an intermediate position between the first and second positions as the sliding body is moved from the second position to the first position;
• and
• the housing and the driver including stop members positioned so that when the stop members are engaged, the movement of the driver is halted when the sliding body reaches the intermediate position as the sliding body moves from the second position to the first position so to disengage the reciprocating driver from the dosage adjustor.