Two stage hand operated pump - has low pressure cylinder leading high pressure delivery cylinder, which are charged on down and up strokes respectively
Реферат: The tyres of racing bicycles can be inflated to a high pressure by the two-stage hand operated pump. The pump has two cylinders(10, 11) mounted side by side and fitted into a common end cap base assembly. The piston rods(21, 25) are joined to a common handle. On the down stroke air flows into the first stage cylinder through a port(31) and passes over the edge of the cup washer(20A) of the piston(20). On the up-stroke the air is driven into the second stage cylinder(11) through the transfer port(30) and delivered through the non-return valve(34) on the following downstroke.
Improvements in Two-stage Compression Pumps.
Номер патента: GB191229469A. Автор: Gregory John Spohrer,John Adams Wilson. Владелец: Individual. Дата публикации: 1913-06-05.