Patent ID: 7171752

Claim:
A trimmer ( 10 ) comprising: a blade connection portion ( 12 ) and a handle ( 11 ), a recess and a first groove ( 19 ) defined in two opposite sides of the blade connection portion ( 12 ), the recess ( 15 ) located between two inner end surfaces ( 16 ) of the blade connection portion ( 12 ) and each inner end surface ( 16 ) including an inclined groove ( 17 ); a blade ( 20 ) engaged with the recess and having a cutting edge ( 210 ); a pattern block ( 30 ) attached onto the blade ( 20 ) and having a second groove ( 32 ) defined in an outside thereof, and the cutting edge ( 210 ) of the blade ( 20 ) being exposed beyond a lower edge ( 35 ) of the pattern block ( 30 ), the pattern block ( 30 ) having two inclined ribs ( 31 ) on two ends thereof and the two inclined ribs ( 31 ) engaged with the inclined grooves ( 17 ); and a C-shaped clamp ( 40 ) having two ridges ( 41 ) extending from two insides thereof and the two ridges ( 41 ) being slidably engaged with the first and second grooves ( 19 , 32 ) to sandwich the blade ( 20 ) between the pattern block ( 30 ) and the blade connection portion ( 12 ).