| 主权项 |
1. A subgrade vault with a lid, comprising:
a body portion comprising four side walls which define an enclosure, an upper end, and a lower end; at least one of the four sidewalls comprising an inward taper such that the vault comprises a first internal perimeter proximal the upper end and a second internal perimeter proximal the lower end, the first internal perimeter being less than the second internal perimeter; the lid for closing the upper end, the lid comprising a top surface and a bottom surface and the bottom surface comprising at least one substantially rigid locking arm rotatable between a first position and a second position, the first position comprising an unlocked position and the second position comprising a locked position wherein the locking arm is provided in contact with the at least one sidewall comprising an inward taper; a vertically disposed control member extending through at least a portion of the lid and provided in force-transmitting communication with the least one substantially rigid locking arm; the substantially rigid locking arm comprising an elongate ovoid slot, and wherein the vertically disposed control member extends through the elongate ovoid slot and the elongate ovoid slot enables movement of the locking arm relative to the vertically disposed control member; and a biasing member in the form of a coil spring that biases the substantially rigid locking arm toward an open position such that rotation of the substantially rigid locking arm is facilitated when the vertically disposed control member is rotated, wherein the biasing member is provided around the vertically disposed control member and operable to lower the substantially rigid locking arm. |
