TW342423B - Pump and over-center snap mechanism - Google Patents

Abstract

A pump which includes: a container comprising a working fluid introduction port, a working fluid discharge port, a feed liquid inflow port, and a feed liquid discharge port; a working fluid introduction valve for opening/closing the working fluid introduction port; and a working fluid discharge valve for opening/closing the working fluid discharge port; in which, when the working fluid discharge valve closes the working fluid discharge port, the working fluid introduction port opens the working fluid introduction port; when the working fluid discharge valve opens the working fluid discharge port, the working fluid introduction valve closes the working fluid introduction port; a working fluid valve actuating link connectable to the working fluid introduction valve and the working fluid discharge valve; a float; a main arm linked to the float and also pivotally assembled in the container into rotating a first pintle around a first pivot; a first arm pivotally assembled on the container, the working fluid valve actuating link being connected to the first arm; and an elastic member pivotally linked to the main arm through a second pivot rotating around a second pintle, the elastic member also pivotally connected to the first arm through a third pintle, in which the distance between the first pintle and the third pintle is longer than the distance between the first pintle and the second pintle.