String trimmer head with curved trimmer line guide

A spool for a trimmer head assembly, comprising:

• a hollow hub that defines a central opening that extends through said hub;
• a flange radially extending from said hub;
• a trim line conduit joined to said flange, said trim line conduit having a first open end that leads to a first straight section, that leads to a curved central section, that leads to a second straight section, that leads to a second open end, wherein said curved central section passes around said central opening without passing into said central opening, wherein said first straight section and said second straight section are linearly aligned on opposite sides of said curved central section, and wherein said first straight section of said conduit and said second straight section of said conduit are positioned a predetermined distance apart, wherein said first straight section and said second straight section have a combined length than is at least as long as said predetermined distance.

A trimmer head assembly for a trimming machine, said trimmer head assembly comprising:

• a spool having a hub and a flange radially extending therefrom, wherein said hub is hollow and defines a central opening that extends through said hub;
• a trim line conduit joined to said flange, said trim line conduit having a first open end that leads to a first straight section, that leads to a central relief, that leads to a second straight section, that leads to a second open end, wherein said central relief has a curved peripheral wall;
• at least one deflector disposed in said relief, wherein said at least one deflector and said curved peripheral wall define a guide channel that leads from said first straight section to said second straight section around said central opening.