Patent ID: 8870035

Claim:
A dispenser for dispensing viscous fluids comprising: a housing having a primary cavity defined therein and having an outlet positioned at a front end of said housing, said primary cavity designed to receive a container of viscous fluid; a piston disposed inside said housing and configured to slide within said housing, said piston including a retractable catch; a single gear rack positioned at least partially in a secondary cavity, said secondary cavity positioned adjacent said primary cavity, said secondary cavity is attached to a periphery of said housing said secondary cavity is positioned along a longitudinal length of said primary cavity, said secondary cavity opens into said primary cavity, said rack slot opens into both said primary cavity and said secondary cavity, said gear rack designed to move relative to said housing, said gear rack including teeth designed to engage said retractable catch on said piston to cause said piston to move in a first direction toward said front end of said primary cavity when said gear rack is moved in said first direction, said gear rack designed to cause said retractable catch on said piston to retract when said gear rack moves in a second direction that is opposite said first direction, said retraction of said retractable catch on said piston as said gear rack moves in said second direction resulting in said piston remaining substantially in place as said gear rack moves in said second direction; and, a trigger in operative relation to said gear rack such that actuation of said trigger causes the rack to move in said first direction.