| 摘要 |
A device (10) for dispensing a predetermined mount of fluid ma- terial from chambers within a car- tridge (148). This device includes a housing, a trigger pivotably con- nected to the housing (12) and a plunger (18) having teeth (108) on a top side thereof entering the hous- ing and passing through an upper part of the trigger (46). A ratchet (110) is attached to the upper part of the trigger and engaged between the plunger teeth. When force is ap- plied to the trigger, the ratchet is pushed forward. When the trigger is released the ratchet moves back- ward causing the plunger to move with the ratchet. The plunger moves backward a short distance until the force applied by the ratchet is over- come through frictional engagement between the plunger and a frictional brake (104, 106) mounted on the housing, at that point the ratchet slides over the next tooth behind it on top of the plunger.
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