| 摘要 |
A hand dispenser for dispensing an extrudable material includes a housing for holding the extrudable material, along with a pistol grip handle. A trigger member is mounted adjacent the pistol grip handle for movement in a path toward and away therefrom to incrementally effect a metered dispensing of the extrudable material. An adjustable stop cam is mounted in the path of movement of the trigger member. The stop cam has different cam portions engageable by the trigger member and is effective to limit movement of the trigger member to different degrees and, thereby, vary the metered amount of dispensed material. A piston rod has a series of ratcheting teeth on at least two different sides of the rod engageable by a drive pawl operatively associated with the trigger member. The ratcheting teeth in one series thereof has a spacing different from the spacing of the ratcheting teeth in the other series thereof. Therefore, the multiple series of ratcheting teeth provide multiple settings of the dispenser for each setting of the adjustable stop cam.
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