Patent ID: 8051993

Claim:
A head rail for an adjustable roller shade, comprising: two tubes, each one of the tubes being circular in section and having: a periphery; an inner wall; and an adjustment slot having: a sunken rail being hollow, and longitudinally formed on and protruding inwardly from the inner wall of the tube; an opening longitudinally formed through a portion of the periphery of the tube directly above the sunken rail, and having a width no larger than that of the sunken rail; a threaded hole formed through the sunken rail and being adjacent to one end of the tube; and a fastener mounted through the threaded hole; and an extension bar being elongated, adjustably mounted in the tubes and having: a center shaft formed along an axial direction of the extension bar; multiple wings formed on and radially and longitudinally protruding from the center shaft of the extension bar, each one of the wings having a free edge contacting with the inner walls of the tubes; and a rail holder having: a stand portion formed on and radially and longitudinally protruding from the center shaft of the extension bar, and having a top; and a holding portion longitudinally formed on the top of the stand portion to slidably hold the sunken rail of the adjustment slot slid therein, and having: a recessed bottom longitudinally formed on the top of the stand portion and selectively abutted against by the fastener; and two fences longitudinally formed on and protruding upwardly from two opposite sides of the recessed bottom and contacting with the inner wall of the tubes.