a door stop device , includes a blocking mechanism and a guiding arm , one of these being fastened to the opening part of the door , the other being fastened to the frame , the blocking mechanism including a braking element pressed against a braking roller which is kept in contact with the guiding arm , the axle of the braking roller being allowed to move relatively to the body of blocking mechanism within specified limits , the blocking mechanism also including elastic elements defined to bring braking roller and braking element , back in compression against each other . a mobile interface unit , allows to modulate the load generated by the elastic elements , increasing the load when braking roller is in locked position and decreasing the load when braking roller rotates freely .