Patent ID: 11859402
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 4:
5. The apparatus described in claim 4 above, wherein:
(a) said pair of essentially parallel front and back support plates further comprising an upper hole aligned with a corresponding upper hole of the other support plate;
(b) each of said converging tip regions of the respective pivotable 1st and 2nd support legs further comprising an upper bore aligned with said upper holes and near the terminal tip, and along a plane closely parallel to said diagonal planar cutaway, each respective upper bore and upper holes receiving a removable fastening pin;
wherein, when the respective 1st or 2nd support leg is in the vertical compacted position, said respective upper holes of said opposing support plates are aligned with said respective upper bore near said terminal tip, so that inserting said fastening pin therethrough locks the respective leg in the compacted position, while inserting said fastening pin through the respective upper holes in the support plates when the respective leg is in the free-standing position chocks against the respective leg to fix the leg in the free-standing position.