Device for braking float motion in float-type liquid level gauge

A device for braking the motion of a float in a float type liquid-level gauge used with a liquid container and adapted so that, by virture of the float kept on the liquid surface in the container by buoyant force and allowed to follow faithfully the vertical displacement of liquid level by the force of gravity acting thereon, the volume of the liquid in the container measured in terms of the height of the liquid level determinable by the position of the float relative to the container is indicated on the scale of the gauge, which device comprises:

• a first member possessed of an inner chamber,
• a second member accommodated within the inner chamber of the first member in such a manner as to produce a motion relative to the first member, the size of the second member being such that the inner chamber of the first member is large enough to accommodate the second member and also retain an extra space for permitting the motion of the second member relative to the first member.
• a fluid placed to fill the extra space within the inner chamber of the first member,
• a cover member serving to seal tightly the inner chamber containing therein the second member and the fluid,
• a path for permitting the flow of the fluid within the tightly sealed inner chamber when there is produced a relative motion between the first and second members mentioned above,
• means for fixing in position either one of the first and second members, and
• means for connecting the other one of the first and second members with the part adapted to move in conjunction with the float,
• said first member possesses a disc-like inner chamber and said second member being provided with vanes adapted to rotate around the axis thereof within the inner chamber, whereby the relative motion to be produced between the first and second members is a rotary motion.