Patent ID: 7861370

Claim:
A caster (A) comprising: a casing ( 1 ) having a shank ( 11 ) which is radially connected to the casing ( 1 ) and a locking unit ( 12 ) is located at a lower end of the shank ( 11 ); two wheels ( 2 ) connected to two sides of the casing ( 1 ) and a shaft ( 21 ) extending through the two wheels ( 2 ) and the casing ( 1 ), an inner gear ( 22 ) connected to each of the two wheels ( 2 ); a direction unit ( 3 ) located in the casing ( 1 ) and including a first lever ( 31 ) and an opening ( 311 ), the first lever ( 31 ) connecting the direction unit ( 3 ) to the locking unit ( 12 ); and a brake unit located in the casing ( 1 ) and including a second lever ( 41 ), the second lever ( 41 ) connecting the brake unit to the locking unit ( 12 ) and the inner gears ( 22 ), the second lever ( 41 ) being engaged with the opening ( 311 ) of the first lever ( 31 ) and sharing a common pivot ( 411 ) with the first lever ( 31 ) to respectively brake the caster and control direction of the caster, the brake unit further including a second plate ( 42 ), a second piece ( 43 ), a second spring ( 44 ), a return spring ( 46 ) and a guide plate ( 45 ).