Safety buckle for a window blind assembly

Abstract

A safety buckle for a window blind assembly includes a connecting part, a bar section, and a pair of surrounding arms. The connecting part is adapted for mounting on one side of the window blind assembly, and has two ends spaced apart from each other in a longitudinal direction. The bar section extends along the longitudinal direction and is connected to the two ends of the connecting part. Each of the surrounding arms extends along an arc from a corresponding one of the ends of the connecting part toward another one of the ends of the connecting part. The surrounding arms cooperate with the bar section to define a buckle hole that is adapted for extension of a pull cord unit of the window blind assembly therethrough. The surrounding arms define an escape path therebetween that is in spatial communication with the buckle hole.

1 . A safety buckle for a window blind assembly, the window blind assembly including a top rail, a drawable light-blocking unit hung from the top rail, and a pull cord unit for drawing up and lowering the drawable light-blocking unit, said safety buckle comprising:
 a connecting part adapted for mounting on one side of the light-blocking unit of the window blind assembly, said connecting part having two ends spaced apart from each other in a longitudinal direction;   a bar section that extends along the longitudinal direction and that is connected to said two ends of said connecting part; and   a pair of surrounding arms, each of said surrounding arms extending along an arc from a corresponding one of said ends of said connecting part toward another one of said ends of said connecting part, said surrounding arms cooperating with said bar section to define a buckle hole that is adapted for extension of the pull cord unit of the window blind assembly therethrough;   wherein said surrounding arms define an escape path therebetween that is in spatial communication with said buckle hole, and are configured to allow the pull cord unit to escape from said buckle hole into said escape path when the pull cord unit is subjected to a pulling force in a transverse direction that is transverse to the longitudinal direction and that is away from said bar section.   
     
     
         2 . The safety buckle for a window blind assembly as claimed in  claim 1 , wherein each of said surrounding arms includes a connecting section extending from the corresponding one of said ends of said connecting part, and a plate section extending from said connecting section toward another one of said ends of said connecting part;
 said plate sections being radially spaced apart from each other and cooperating to define said escape path;   for each of said surrounding arms, said plate section having a free end that is distal from said connection section thereof and that is spaced apart from said connecting section of another one of said surrounding arms.   
     
     
         3 . The safety buckle for a window blind assembly as claimed in  claim 2 , wherein, for each of said surrounding arms, said plate section has a thickness smaller than that of said connecting section. 
     
     
         4 . The safety buckle for a window blind assembly as claimed in  claim 3 , wherein each of said connecting sections of said surrounding arms subtends an arc length of 50 degrees, and each of said plate sections subtends an arc length of 70 degrees. 
     
     
         5 . The safety buckle for a window blind assembly as claimed in  claim 1 , wherein said connecting part and said buckle hole are semi-circular in shape.