초록 ▼

An obstructing plate construction for a tank having an opening in a top wall thereof and a cover with a base plate having an opening aligned with the opening in the top wall, the obstructing plate construction including an adapter plate mounted between the base plate and the top wall, bolts permanen

An obstructing plate construction for a tank having an opening in a top wall thereof and a cover with a base plate having an opening aligned with the opening in the top wall, the obstructing plate construction including an adapter plate mounted between the base plate and the top wall, bolts permanently affixed to the adapter plate for receiving nuts at the underside of the top wall, an opening in the adapter plate aligned with the opening in the top wall and the opening in the base plate, a plurality of nut and bolt assemblies extending through the base plate, adapter plate and top wall for securing them in assembled relationship, an obstructing plate, and locking bolts for selectively securing the obstructing plate to the adapter plate in obstructing relationship to aligned openings in the base plate, adapter plate and top wall.

대표청구항 ▼

In a thief hatch construction mounted on the top wall of a tank having a wall opening therein, said thief hatch construction including a base plate, a base plate opening in said base plate overlying said wall opening, a plurality of first holes in said top wall surrounding said wall opening, and a p

In a thief hatch construction mounted on the top wall of a tank having a wall opening therein, said thief hatch construction including a base plate, a base plate opening in said base plate overlying said wall opening, a plurality of first holes in said top wall surrounding said wall opening, and a plurality of second holes in said base plate in alignment with said first holes for receiving bolts for fastening said base plate to said top wall, an obstructing structure for obstructing said wall opening comprising an adapter plate mounted between said top wall and said base plate, first bolt means extending downwardly from said adapter plate and through at least one of said first holes for securing said adapter plate to said top wall, an adapter plate opening in said adapter plate in registry with said base plate opening and said wall opening, a plurality of third holes in said adapter plate in registry with said first and second holes, second bolt means extending through said first, second and third holes for securing said base plate and said adapter plate to said top wall, an obstructing plate, and locking means for selectively locking said obstructing plate to said adapter plate in obstructing relationship to said adapter plate opening to thereby obstruct said wall opening.