초록 ▼

An improved gate driving link mechanism is provided, this mechanism being originally designed for opening and closing a flapdoor type discharge gate of a weighing hopper of top-charge and bottom discharge type, used in a combination weighing device such as disclosed in U.S. Pat. No. 4,344,492, the i

An improved gate driving link mechanism is provided, this mechanism being originally designed for opening and closing a flapdoor type discharge gate of a weighing hopper of top-charge and bottom discharge type, used in a combination weighing device such as disclosed in U.S. Pat. No. 4,344,492, the improvement of which is to add an intermediate bell crank for confining overshoot of the opened gate to avoid unwanted time loss which affect high speed operation of the device and undesirable shock and vibration which affects accuracy of measurement.

대표청구항 ▼

In a hopper having a discharge opening at the bottom, said opening being provided with a flapdoor type gate; a gate driving device comprising a first bell crank having first and second arms and pivoted on a horizontal axis for receiving original driving force applied to said first arm, a second bell

In a hopper having a discharge opening at the bottom, said opening being provided with a flapdoor type gate; a gate driving device comprising a first bell crank having first and second arms and pivoted on a horizontal axis for receiving original driving force applied to said first arm, a second bell crank having first and second arms and pivoted on another horizontal axis, a first connecting rod for connecting the second arm of said first bell crank to the first arm of said second bell crank, a second connecting rod for connecting the second arm of said second bell crank to said gate; characterized in that the locations and geometries of said bell cranks and connecting rods are selected such that, when said gate is in closed state, the second arm of said first bell crank and said first connecting rod align on a straight line, and that, when said gate is in open state, thhe second arm of said second bell crank and said second connecting rod align on another straight line.