Patent ID: 9714538
Date: 2017-07-25
CPC Classifications: E06B

Claim:
1. A window blind comprising: an upper rail; a lower rail located below said upper rail in an attitudinal direction; a blind unit disposed between said upper and lower rails; a reel unit disposed on one of said upper and lower rails; two pull cords each being connected to said reel unit and the other one of said upper and lower rails; a retarding unit cooperating with said reel unit, and disposed on the one of said upper and lower rails, said retarding unit including two retarders that are spaced apart from each other in a lateral direction and that respectively correspond to said pull cords, each of said retarders including a bracket, a first retarding shaft that is disposed on said bracket, and a rod member that is disposed on said bracket and that is located between said first retarding shaft and said reel unit in the lateral direction, said bracket of each of said retarders having a bottom wall, two lateral walls that are spaced apart from each other in the lateral direction and that are connected to said bottom wall, and two end walls that are spaced apart from each other in a front-rear direction and that are connected to said bottom wall, said bottom wall of each of said retarders cooperating with said lateral walls and said end walls of said retarder to define a retaining space thereamong, one of said lateral walls of each of said retarders being distal from said reel unit in the lateral direction, said first retarding shaft of each of said retarders including a core pin that is mounted to the one of said lateral walls of said retarder distal from said reel unit and that extends in the front-rear direction, and a roller member that is rotatably mounted on said core pin, said rod member of each of said retarders being mounted to said end walls of said retarder, each of said pull cord extending away from said reel unit and around said roller member of said first retarding shaft of the corresponding retarder, and extending around said rod member of the corresponding retarder; and a ladder-string adjusting unit including two ladder-string seats that are respectively disposed on said brackets of said retarders, a connecting rod that extends in the lateral direction and that interconnects said ladder-string seats, and two ladder strings that are respectively connected to said ladder-string seats, each of said ladder-string seats being pivotally mounted to said lateral walls of the corresponding retarder, extending in the lateral direction through said retaining space of the corresponding retarder, and being located above said rod member and said first retarding shaft of the corresponding retarder, each of said ladder strings extending in the altitudinal direction and being connected to said blind unit.