Venetian blind with concealed lift cords

A Venetian blind comprising:

• a headrail extended in transverse direction, said headrail having a first end;
• a bottom rail extended in transverse direction and spaced below said headrail;
• a plurality of slats arranged in parallel between said headrail and said bottom rail;
• a suspension tube longitudinally disposed in vertical, said suspension tube having a top end connected to the first end of said headrail, said suspension tube comprising at least one longitudinal sliding slot;
• at least one lift cord, said at least one lift cord each having a first end fixedly fastened to said bottom rail and a second end upwardly extended through said slats into the inside of said headrail and then transversely extended to the first end of said headrail and then extended vertically downwards from the first end of said headrail into the inside of said suspension tube;
• a lift cord clamp mounted in said suspension tube for movement along said at least one longitudinal sliding slot of said suspension tube and adapted for clamping said at least one lift cord, said lift cord clamp comprising a sliding sleeve sleeved onto said suspension tube, and a clamping device inserted through said at least one longitudinal sliding slot of said suspension tube and moved with said sliding sleeve up and down along said at least one sliding slot of said suspension tube and adapted for clamping said at least one lift cord;
• and
• a lift lock installed in a path in which said at least one lift cord passes and adapted for locking said at least one lift cord.