Coke oven larry car coal restricting insert

In a gravity operated hopper for charging coal into a coking chamber through a charging hole, said hopper having a collar defining a bottom discharge opening equal in minimum dimension to the minimum dimension of said charging hole, gate means for opening and closing said hopper and a drop sleeve around said collar the improvement comprising;

• a. replaceable restriction means in said collar for restricting the coal flowing through said collar to a columnar mass having a width less than the interior width of said coking chamber and less than the minimum dimension of said charging hole to provide space for exhausting gases during charging of said coking chamber;
• b. said restriction means being an insert comprising:
• i. an outer portion in contact with the interior surface of said collar;
• ii. an inner surface defining an orifice with a minimum dimension aligned in the same vertical plane as the width of the interior of said coking chamber;
• and
• iii. means for retaining said insert in said collar;
• c. said hopper walls converging downwardly toward said collar at a first angle with a horizontal plane and said inner surface converging downwardly toward said orifice at a second angle with a horizontal plane, said second angle equal to said first angle;
• and
• d. said orifice being centered within said collar above said gate means.