Dispenser for viscous materials

A dispenser for dispensing a viscous product contained in a flexible package, the dispenser comprising:

• a body extending along a longitudinal axis and having:
• a first end;
• an opposite second end;
• a cavity configured to receive the flexible package, and
• a handle assembly coupled to the first end, the handle assembly having:
• a fixed handle;
• a trigger pivotally coupled to the fixed handle;
• a rod extending between the fixed handle and the trigger into the cavity along the longitudinal axis;
• a pawl member pivotally coupled to the fixed handle;
• and
• a gasket coupled to the first end of the body through which the rod slides,
• the gasket applies a radially inwardly force on the rod to thereby prevent movement of the rod away from the piston as the trigger is pivoted;
• and
• a plurality of dispensing valves positioned at the second end of the body;
• and
• a piston movably disposed in the cavity for engagement with the flexible package;
• wherein as the trigger is pivoted toward the fixed handle the trigger pivots the pawl member such that pawl member engages the rod and axially moves the rod along the longitudinal axis, and wherein the rod moves the piston into engagement with the flexible package such that the viscous material dispenses through the plurality of dispensing valves.