Patent ID: 11905943
Assignee: FLUKE CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 15:
16. A portable high pressure calibration device, comprising:
a multi-stage electric gas pump including:
an eccentric shaft including a main body having a longitudinal axis, a first eccentric portion, and a second eccentric portion, wherein the first eccentric portion and the second eccentric portion are fixed on the main body, the eccentric shaft is driven by a driving mechanism to produce a first circular movement of the first eccentric portion around the longitudinal axis and a second circular movement of the second eccentric portion around the longitudinal axis, and the second circular movement is synchronized with the first circular movement; and
a plurality of cylinders each including a piston rod and a chamber, wherein a first piston rod of a first cylinder and a second piston rod of a second cylinder are in mechanical cooperation with the first eccentric portion by way of a first crank, the second piston rod and the first piston rod being connected to each other away from the first eccentric portion;
wherein the first crank has a first end and a second end, the first end of the first crank being connected to the first eccentric portion, and the second end of the first crank being connected by way of a first cam bearing to at least one of the first piston rod or the second piston rod, the first cam bearing being offset from the first eccentric portion.