| 摘要 |
A trigger actuated rotary dental amalgam dispenser is provided with a material distribution shell within which a transport carriage is rotated in a concave depression under the control of a trigger actuator. The shell is constructed with liquid conduit channels to carry mercury from a reservoir atop the shell to a measuring chamber in the carriage. Upon actuation of the trigger, a measuring chamber, otherwise held in communication with the mercury reservoir by a spring bias on the trigger, is rotated relative to the shell so that the mercury in the measuring chamber flows through an outlet channel in the shell and is discharged through a dispensing well. Concurrently, a slide with a silver receptacle tray is repositioned to receive another tablet of silver, and dispense this tablet into the dispensing well when the trigger is released and the biasing spring returns the slide to registration with the dispensing well. The volume of the measuring chamber is adjustable by means of a metering rod which can be advanced or retracted relative to the measuring chamber. Preferably a micropore filter is located in communication with the measuring chamber by means of a relief vent when the measuring chamber is in communication with the mercury reservoir. This allows air to escape as mercury fills the volume of the measuring chamber, yet the mercury cannot escape. Also, a vacuum break vent is preferably located to communicate with the measuring chamber when that chamber is in communication with the outlet channel.
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