| 摘要 |
A locking system for securing a cover that moves within a hole between a lowered position and a raised position is disclosed. The locking system includes one or more locking mechanisms. Each locking mechanism includes an upper leg and a lower leg, each upper leg and the lower leg having a proximal end and a distal end. Each locking mechanism further includes a first joint that joins the upper leg near the respective distal ends of the upper leg and the lower leg, the first joint allowing planar rotational motion of the upper leg relative to the lower leg between a minimum folded angle in the lowered position and a maximum unfolded angle in the raised position. Each locking mechanism further includes a second joint to flexibly attach the distal end of the upper leg on the bottom side of the cover to allow planar rotational motion of the upper leg relative to the cover, and a third joint to flexibly attach the distal end of the lower leg to an attachment disposed on the bottom of the hole.
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