CPC B66F 3/26 (2013.01) | 5 Claims |
1. A jack with a double high-pressure structure, said jack comprising:
a base member;
a pump body provided on the base member;
an oil cylinder secured to said base member;
an oil pass pipe arranged within said base member, wherein hydraulic oil is pumped into the pump body from the oil pass pipe to implement lifting of the jack;
a connecting pipe arranged between the oil pass pipe and the oil cylinder, said connecting pipe providing a direct fluid communication between said oil pass pipe and said oil cylinder;
an oil drain valve;
a safety valve, said oil drain valve and said safety valve being in fluid communication with said oil cylinder;
a low-pressure check valve provided within the base member;
a first high-pressure check valve provided within the base member; and
a second high-pressure check valve provided within the base member;
wherein said second high-pressure check valve laterally and separately spaced from said first high-pressure check valve; said second high-pressure check valve extending in a transverse direction with respect to said first high-pressure check valve; and wherein said second high-pressure check valve is arranged within the connecting pipe and said first high-pressure check valve is arranged within said oil pass pipe.
|