Slat angle adjusting device for a venetian blind

Abstract

A slat angle adjusting device for a Venetian blind includes a first casing and a second casing coupled with each other. A pinion is rotatably mounted between the first and second casings. A worm is rotatably mounted between the first and second casings and meshes with the pinion. A driven gear is fixedly mounted on one end of the worm. A drive gear is rotatably mounted between the first and second casings and meshes with the driven gear. A drive axle is formed on one end of the drive gear and extends outward of the first and second casings. A bracket includes a fist end portion engaged with the first and second casings, and a second end portion having two side walls extending upwardly therefrom. A roller is fixedly mounted on the drive axle and is rotatably received between the two side walls of the bracket.

What is claimed is:  
     
       1. A slat angle adjusting device ( 10 ) for a Venetian blind ( 40 ) comprising: 
       a first casing ( 12 );  
       a second casing ( 14 ) coupled with said first casing ( 12 );  
       a pinion ( 18 ) rotatably mounted between said first and second casings ( 12 ) and ( 14 ) ;  
       a worm ( 16 ) rotatably mounted between said first and second casings ( 12 ) and ( 14 )  and meshing with said pinion ( 18 ), a driven gear ( 162 ) fixedly mounted on one end of said worm ( 16 );  
       a drive gear ( 222 ) rotatably mounted between said first and second casings ( 12 ) and ( 14 )  and meshing with said driven gear ( 162 ), a drive axle ( 22 ) formed on one end of said drive gear ( 222 ) and extending outward of said first and second casings ( 12 ) and ( 14 ) ;  
       a bracket ( 24 ) having a first end portion engaged with said first and second casings ( 12 ) and ( 14 ) , and a second end portion having two side walls ( 242 ) extending upwardly therefrom ; and  
       a roller ( 20 ) fixedly mounted around said drive axle ( 22 ) and rotatably received between said two side walls ( 242 ) of  by said bracket ( 24 ).  
     
     
       2. The slat angle adjusting device in accordance with claim  1 , wherein said roller ( 20 ) has two sides each having a flange ( 200 ) extending radially and outwardly therefrom, a recess ( 201 ) defined in said roller ( 20 ) and located between said two flanges ( 200 ), each of said two flanges ( 200 ) having a slit ( 202 ) defined therein and communicating with said recess ( 201 ). 
     
     
       3. The slat angle adjusting device in accordance with claim  1 , wherein said roller ( 20 ) has a through hole ( 204 ) longitudinally defined therein. 
     
     
       4. The slat angle adjusting device in accordance with claim  1 , wherein said bracket ( 24 ) has two spaced holes ( 246 ) vertically defined in the second end portion thereof and located under said roller ( 20 ). 
     
     
       5. The slat angle adjusting device in accordance with claim  1 , wherein said bracket (   24   )  has two side walls  (   242   )  extending upwardly from the second end portion thereof, and said roller  (   20   )  is rotatably received between said two side walls  (   242   )  of said bracket  (   24   ).