Hand Pump with Two-step Force Amplifier Using Lever-toggle

The working principle of a new type of hand pump with two-step force amplifier using lever-toggle was introduced,the calculating formulae of the displacement and output pressure were given.The new pump can provide high-flow liquid with low-pressure in vacant path stage,and can provide small-flow liquid with high-pressure in working stroke stage.Compared with traditional hand pump,work efficiency is improved significantly.