Universal lid for underground access boxes
View Patent ↗A universal lid closure for underground landscape and other utility access boxes uses flexible tongues depending from the underside of the lid and adapted to engage the interior of the access box, which box may have any one of various constructions. In one embodiment, the tongues have a plurality of diametrically opposed pairs of locking detents, each pair defining a different vertical position, to engage an annular locking shoulder on the interior of the box to secure the lid in the closed position.
1. A universal lid for an access box for an underground utility, the access box having a generally cylindrical shape defining an upper circular opening, an annular interior wall portion defining an undercut annular shoulder, the lid comprising:
a disk-shaped lid body adapted to overlie and close the access box opening;
pairs of diametrically opposite tabs extending downwardly from and generally perpendicular to the underside of the body, the tabs having semi-cylindrical outer surfaces defining a common radially outer cylindrical surface, each tab including a flexible tongue formed integrally with the tab and joined thereto along a vertical connecting seam, said tongues extending generally circumferentially from the connecting seam with respect to the lid body and tangentially with respect to the outer surface of the tab, the tongues having upper edges spaced from the underside of the lid body and flat radially outer surfaces dimensioned to contact the box opening and to deflect radially inwardly to provide radially biased frictional contact with the interior wall portion and each of said tongues having a trailing edge defining a plurality of vertically spaced stepped detents providing selective locking contact with the underside of the shoulder, and circumferentially adjacent tongues having respective pluralities of detents that are vertically separated.
2. The apparatus as set forth in claim 1 wherein the tongues include a lower upwardly angled lead-in edge portion extending along a lower tongue edge to the trailing edge of the tongue and adapted to facilitate radially inward deflection of the tongue.
3. The apparatus as set forth in claim 2 wherein said pairs of diametrically opposed tabs comprises at least two pairs of diametrically opposed tabs.
4. The apparatus as set forth in claim 3 wherein the tabs of each diametrically opposed pair are identical and the tongues of one opposed pair are shaped differently from the tongues of the other opposed pair.
5. The apparatus as set forth in claim 3 wherein the locking detents of one opposed pair are positioned along the trailing edge at a location different from the position of the locking detents of the other opposed pair.
6. The apparatus as set forth in claim 1 wherein the tabs are coaxial with the lid body.
7. The apparatus as set forth in claim 1 including gussets connecting the tabs to the underside of the lid body.
8. The apparatus as set forth in claim 7 wherein the gussets extend radially inwardly from the tabs and are connected to a central cylindrical support coaxial with and extending downwardly from the underside of the lid body.
9. The apparatus as set forth in claim 2 wherein the trailing edge of each tongue includes a generally vertical upper edge portion, and a locking detent in a transition between the lower lead-in edge and the upper edge portion.
10. The apparatus as set forth in claim 9 wherein the locking detents on circumferentially adjacent pairs of flaps are disposed at different axial positions.