Adjustable mounting system for window blinds and shades

A roller blind, comprising:

• a roller tube with a window covering rolled around the roller tube;
• a mechanism associated with the roller tube for raising and lowering the window covering including a clutch and a continuous cord loop having a loop end adjacent the clutch, wherein the roller tube is hollow and the clutch includes a central recess;
• a first mounting fixture including a first end member mountable to a first side of a window frame;
• a second mounting fixture including a second end member mountable to a second side of the window frame;
• a tension bar extending completely through the hollow roller tube and the central recess of the clutch and extending between the first end member and the second end member, and non-rotatably coupled to the first mounting fixture and to the second mounting fixture;
• and
• a short adjustment mechanism for adjusting a length of the tension bar extending between the first end member and the second end member over a first distance, in combination with a long adjustment mechanism for adjusting the length of the tension bar over a second distance, wherein the second distance is greater than the first distance.

A window covering system, comprising:

• a headrail including a mechanism for extending and retracting a window covering;
• a clutch associated with the mechanism for extending and retracting the window covering, wherein the clutch includes a central recess;
• a tension bar extending through the headrail and the central recess of the clutch;
• a first mounting fixture including a first end member non-rotatably coupled to the tension bar for mounting under pressure to a first side of a window frame, wherein the first end member frictionally engages the first side of the window frame, wherein the first mounting fixture includes an end plate;
• a second mounting fixture including a second end member non-rotatably coupled to the tension bar for mounting under pressure to a second side of the window frame, wherein the second end member frictionally engages the second side of the window frame;
• a short adjustment mechanism for adjusting a length of the tension bar over a first distance, the short adjustment mechanism comprising:
• a compression spring coupled to the tension bar and the end plate, and
• a locking mechanism including a locked position in which the compression spring is compressed and the end plate is retracted, and an unlocked position in which the compression spring is released and the end plate is extended to press against the first side of the window frame;
• and
• a long adjustment mechanism for adjusting the length of the tension bar over a second distance, wherein the second distance is greater than the first distance.