are capable of being removed from the storage rail through the upper end opening the retainer includes front and rear retaining plate portions with open ended slots engaging respectively the ribs of the storage rail and is capable of being removed forcibly and upwardly from the storage rail application_number US 5384505 A description referring to fig1 2 and 3 the preferred embodiment of a venetian blind according to this invention is shown to include a headrail 1 a covering unit 2 a cord winding device 3 a storage rail 4 two retainers 5 and two end caps 6 the headrail 1 is mounted fixedly on a wall not shown and includes a rail body 11 two covers 12 press fitted respectively within two opposite ends of the rail body 11 and two supporting members 13 disposed within the rail body 11 between the covers 12 the rail body 11 includes a pair of vertical front and rear walls 111 a horizontal bottom wall 112 and an accommodating space 113 defined among the front and rear walls 111 and the bottom wall 112 the front and rear walls 111 extend respectively integrally and upwardly from opposite front and rear sides of the bottom wall 112 the covering unit 2 is disposed between the headrail 1 and the storage rail 4 and includes a light adjusting rod 21 disposed rotatably on the supporting members 13 two cord connecting elements 22 connected respectively and fixedly to two opposite ends of the light adjusting rod 21 a driving member 23 disposed within the accommodating space 113 in the headrail 1 and driven to rotate the light adjusting rod 21 by a selected angle a vertical controlling rod 24 connected to.