Attachment member for an architectural covering

1. An architectural covering, comprising:

a shade material including a rear portion and a front portion;

a rail member including an elongated slot, said slot including an opening formed in a top end of said rail member; and

an attachment member coupling said shade material to said rail member, said attachment member including a first portion extending at least partially within said elongated slot of said rail member for pressing said shade material against said rail member within said elongated slot of said rail member, and a second portion extending through said opening and at least partially externally away from said rail member;

wherein said second portion of said attachment member includes a first leg and a second leg, said first and second legs positioned at least partially into said shade material, said first leg contacting a front surface of said rear portion of said shade material, said second leg contacting a rear surface of said front portion of said shade material configured to bias said front portion of said shade material away from said rear portion of said shade material located external to said rail member.

2. The architectural covering of claim 1 , wherein:

said second portion is configured to maintain a configuration of said shade material adjacent to said rail member.

3. The architectural covering of claim 1 , wherein said shade material includes a plurality of cells, said attachment member at least partially extends within a lowermost cell of said plurality of cells forming said shade material, said attachment member being configured to maintain a configuration of said front portion of said lowermost cell.

4. The architectural covering of claim 1 , wherein said attachment member extends along a portion of said shade material located external to said rail member, said attachment member configured to maintain a configuration of a portion of said shade material immediately adjacent said rail member.

5. The architectural covering of claim 4 , wherein:

said shade material includes a plurality of cells;

said attachment member extends within a lowermost cell of said plurality of cells of said shade material; and

said attachment member maintains a configuration of said lowermost cell.

6. The architectural covering of claim 5 , wherein said first portion couples said shade material to said rail member, said second portion is arranged to maintain said configuration of said lowermost cell of said shade material.

7. The architectural covering of claim 6 , wherein said second leg extends away from said first leg.

8. The architectural covering of claim 7 , wherein said second leg is arcuately-shaped.

9. The architectural covering of claim 7 , wherein said second portion is asymmetrical about a vertical plane.

10. The architectural covering of claim 1 , wherein said second leg of said second portion of said attachment member is arranged to position said front portion of said shade material away from said rear portion of said shade material to shape at least a portion of said shade material.

11. The architectural covering of claim 1 , wherein:

said first portion of said attachment member is enlarged to limit removal of said attachment member and said shade material through said opening.

12. The architectural covering of claim 1 , wherein said first and second portions are formed together as a single element.

13. An attachment member for coupling a shade material of an architectural covering to a rail member including an elongated slot having an opening formed in a top end of the rail member, said attachment member comprising:

a first portion arranged and configured to press the shade material against an inner surface of the slot formed in the rail member; and

a second portion arranged and configured to extend through the opening in the rail member and to engage a portion of the shade material located external to the rail member;

wherein said second portion comprises a first leg and a second leg arranged and configured to extend into the shade material, said first leg contacting a front surface of a rear wall of the shade material, said second leg contacting a rear surface of front portion of the shade material configured to bias the front portion away from the rear wall.

14. The attachment member of claim 13 , wherein said second portion includes a width dimension varying with distance away from said first portion.