Non-Rocking Type Manhole Covers and Catch Basin Grates NO NOISE DOES AWAY WITH LOCKS Simple, Quick Adjustment Adjustment of the Non-Rocking Cover/Grate is made by placing it in the frame, and then rotating until the pointed lug on its edge engages a corresponding slot in the frame. There are multiple slots, each of which changes the diameter of the opening. Moving into place is readily accomplished by placing a hook in the pickhole and drawing the lid around until it fits snugly. When properly positioned, the Non-Rocking Cover/Grate will remain firmly seated in the frame. Removal may be acomplished with equal ease.
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Fig. 1 is a top plan of manhole cover showing side-bearing lugs on lid at A, B and C. Lug at A is pointed and, by rotation of the lid, may be fitted to an appropriate slot in the rack of graduated teeth of frame. Properly seated, lid cannot rock.
Fig 2. is a sectional view of manhole cover with lid removed.
Illustrating Non-Rocking feature applied to R-1689 with Type B lid.
Fig 3 is an enlarged view of A, showing pointed lug and graduated rack. The three bearing points, plus the tooth rack feature which receives and adjusts the pointed lug, combine to prevent movement of the lid. The lid remains properly seated in the frame.
NEENAH FOUNDRY
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