Patent ID: 8348237

Claim:
A type of pneumatic non-load quick hydraulic dual-speed jack, including framework, base, piston rod, oil cylinder, external sleeve, connecting rod, pin, pedal rod, step pump core, pump body, seal and oil return valve, has the following features: valve soleplate is fixed to the base; a lower fastness set on the pump body is sealed and fixed to the valve soleplate; the pump body is sealed and fixed to an upper fastness set and lower fastness set respectively; small piston ring on a pump cylinder is integrated with an inner hole on the pump body and lower external ring of the step pump core to form a movable assembly; the upper end of the lower fastness set and big external ring of upper fastness set aim to position one end of a compressed spring in accommodation with spring seat; a circlip is used to position the other end of the compressed spring; the middle part of step pump core is provided with pump core step interface.