| 摘要 |
A pin-shaped device for releasing a flowable medium, comprises a housing having front and rear ends and an axis, a brush-like application element arranged to extend through the front end of the housing and displaceable in a an axial direction, a piston rod arranged to displace the application element, the housing having an intermediate wall provided with a guiding opening, the piston rod being axially movable in the guiding opening, a pressure spring acting upon the piston rod so that the piston rod is movable in the guiding opening under the action of the pressure spring, a dosing piston being in communication with the application element, a control piston, the control piston and the application element being fixedly connected with the piston rod, while the dosing piston being axially movable relative to the piston rod, a supply chamber and a dosing chamber formed in the housing and connected with one another, the dosing chamber being alternatingly closable during the movement of the piston rod at axially opposite ends, and a sealing ring and a sealing cylinder arranged so the control piston abuts at one end of said dosing chamber against the sealing ring, while the dosing piston abuts at an opposite end of the dosing chamber against the sealing cylinder. |
