Patent ID: 6667445
Filing Date: 2003-12-23
Classification: G01G

Abstract:
A hydraulic weighing machine comprising:a base having a load bearing side; a weighing platform disposed on top of said load bearing side of said base; an expandable bag disposed on said load bearing side of said base and supporting said weighing platform thereon, said bag being filled with a liquid body; an upright stand disposed adjacent to said base; and a vertically extending weight scale including a transparent tube having a bottom end in fluid communication with said bag, and a top end hung on said stand, said weight scale further including a set of graduations to indicate a weight value corresponding to liquid level in said tube; whereby, when pressure is applied on top of said weighing platform, said bag will be pressed toward said load bearing side of said base, and said liquid body in said bag will be forced to flow into said tube so that the liquid level in said tube rises accordingly, an indication of the weight value corresponding to the amount of the applied pressure being obtained from said graduations, wherein: said base further has a ground contacting side opposite to said load bearing side, and a coupling hole that extends from said load bearing side through said ground contacting side; said bag being formed with a shaft hole that is coaxial with said coupling hole; said weighing platform being formed with a downwardly extending coupling shaft that extends through said shaft hole and that extends slidably into said coupling hole.