| 摘要 |
A manual hand crank pump has a housing with an inlet and an outlet and has a gearbox with an input and an output and a rotation speed of the output is greater than 50 or 100 times a rotation speed of said input. A hand crank connected to and operable to drive said input of said gearbox and a fan is within the housing and is connected to the output of the gearbox an d is operable to pump air from the inlet to the outlet. The gearbox has a gear train with first and second single gears and first, second, third and forth composite gears, each composite gear having a small gear and a large gear coaxial with said small gear which provide an aggregate gear ration of more than 1:50 or more than 1:100. The hank crank pivots between a stored position and an operating position.
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