Patent ID: 7992837

Claim:
A system comprising: a compactable mold defining a mold cavity for forming a compacted concrete building block, the compactable mold comprising: multiple end walls; multiple compacting side wall structures operable to compact concrete such that force for compacting the concrete building block is applied from more than one direction, each of the multiple compacting side wall structures comprising: a compacting side wall operable to move towards the center of the mold cavity during compaction; and at least one tube structure attached to the compacting side wall such that the respective compacting side wall is operable to move independently of the at least one tube structure during compaction without becoming detached from the at least one tube structure, while the at least one tube structure remains stationary; and plural side assembly/disassembly arms operable to move the multiple compacting side wall structures from a compacted wall position to a retracted wall position.