Patent ID: 11898361
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E  B | IPC B  E

Claim 15:
16. The device of claim 11, further comprising a wedge mechanism attached to each of the hook portions of the movable portion on an interior surface, the wedge mechanism comprising:
a wedge having un upper end, a lower end, and a pin receiving portion between the upper end and the lower end, the lower end having a V-shaped notch; and
a pin biased to a position within the pin receiving portion, wherein:
the wedge is attached to the respective hook portion such that the lower end is biased away from the hook portion;
the pin holds the wedge in a position perpendicular to the respective hook portion when in the pin receiving portion; and
the wedge is in a position oblique to the respective hook portion when the pin is not in the pin receiving portion.