Aerodynamic Trimmer Head For Use In Flexible Line Rotary Trimmers

An aerodynamic trimmer head for use in flexible line rotary trimmers, said head comprising:

• a housing adapted to be operatively connected to a rotary trimmer to effect rotation of the head, said housing defining at least one opening therein for the passage of line therethrough and including an upper housing portion and a lower housing portion, said upper housing portion defining a generally curvilinear upper head surface and said lower housing portion defining an annular, generally curvilinear, lower head surface;
• a spool disposed within said housing for carrying a length of cutting line thereon, said spool being operatively connected to said housing for rotation therewith such that an end portion of line can project from said spool and said housing through each said opening in said housing and wherein said spool defines a generally curvilinear lower spool surface disposed interiorly of and merging into said annular lower head surface such that said upper and lower portions of said housing and said spool collectively provide said head with an aerodynamic generally ellipsoidal profile;
• and
• a plurality of aerodynamic elements defined by said upper and lower head surfaces, said elements including a plurality of troughs extending downwardly and forwardly along nonlinear paths from an upper portion of said upper head surface to a lower portion thereof.

An aerodynamic trimmer head for use in flexible line rotary trimmers, said head comprising:

• a housing adapted to be operatively connected to a rotary trimmer to effect rotation of the head, said housing defining a pair of opposed openings therein for the passage of line therethrough and including an upper housing portion and a lower housing portion, said upper housing portion defining a generally curvilinear upper head surface and said lower housing portion defining an annular, generally curvilinear, lower head surface;
• a spool disposed within said housing for carrying a length of cutting line thereon, said spool being operatively connected to said housing for rotation therewith such that end portions of line can project from said spool and said housing through said opposed openings in said housing and wherein said spool defines a generally curvilinear lower spool surface disposed interiorly of and merging into said annular lower head surface such that said upper and lower portions of said housing and said spool collectively provide said head with an aerodynamic generally ellipsoidal profile;
• and
• a plurality of aerodynamic elements defined by said upper and lower head surfaces, said elements on said upper head surface including at least either a plurality of troughs extending downwardly and forwardly along curvilinear paths from an upper portion of said upper head surface to a lower portion thereof or a plurality of protrusions extending downwardly and forwardly along curvilinear paths from an upper portion of said upper head surface to a lower portion thereof.

An aerodynamic trimmer head for use in flexible line rotary trimmers, said head comprising:

• a housing adapted to be operatively connected to a rotary trimmer to effect rotation of the head, said housing defining at least one opening therein for the passage of line therethrough and including an upper housing portion and a lower housing portion, said upper housing portion defining an upper head surface and said lower housing portion defining a lower head surface;
• a spool disposed within said housing for carrying a length of cutting line thereon, said spool being operatively connected to said housing for rotation therewith such that an end portion of line can project from said spool and said housing through each said opening in said housing;
• and
• a plurality of aerodynamic elements defined by at least said upper head surface, said elements including either a plurality of troughs extending downwardly and forwardly along nonlinear paths from an upper portion of said upper head surface to a lower portion thereof or a plurality of protrusions extending downwardly and forwardly along curvilinear paths from an upper portion of said head surface to a lower portion thereof.