Block tumbler with block-immobilizing device

An apparatus for modifying the appearance of a surface-texture of cementitious blocks, said apparatus comprising:

• a container comprising block-receiving areas for receiving blocks;
• a movement imparting device for imparting a movement to said container;
• and
• at least one vacuum device for immobilizing blocks on a given said block-receiving area during movement of said container;
• wherein when introducing an impacting material in said container and imparting said movement to said container the impacting material is caused to so impact the cementitious blocks as to modify the appearance of the surface texture thereof.

An apparatus for modifying the appearance of a surface-texture of cementitious blocks, said apparatus comprising:

• a container comprising block-receiving areas for receiving blocks;
• a movement imparting device for imparting a movement to said container;
• and
• at least one clamping device for immobilizing blocks on a given said block-receiving area during movement of said container;
• wherein when introducing an impacting material in said container and imparting said movement to said container the impacting material is caused to so impact the cementitious blocks as to modify the appearance of the surface texture thereof.

A method for modifying the appearance of a surface-texture of cementitious blocks, said method comprising:

• immobilizing blocks within a moveable container;
• introducing an impacting material in the container;
• and
• imparting a movement to the container so as to cause the impacting material to so impact the cementitious blocks as to modify the appearance of the surface texture thereof.