US 11,814,272 B2
Jack with double high-pressure structure
Yufeng He, Hangzhou (CN); Weixiang He, Hangzhou (CN); and Gang Sun, Hangzhou (CN)
Assigned to FUYANG TONGLI INDUSTRIAL CO., LTD., Hangzhou (CN)
Filed by FUYANG TONGLI INDUSTRIAL CO., LTD., Hangzhou (CN)
Filed on Sep. 7, 2021, as Appl. No. 17/467,476.
Claims priority of application No. 202022148003.3 (CN), filed on Sep. 27, 2020.
Prior Publication US 2022/0098014 A1, Mar. 31, 2022
Int. Cl. B66F 3/26 (2006.01)
CPC B66F 3/26 (2013.01) 5 Claims
OG exemplary drawing
 
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.