Patent ID: 8567073
Filing Date: 2013-10-29
Classification: A01D

Abstract:
1. 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 curvilinear upper head surface and said lower housing portion defining an annular, curvilinear, lower head surface; a spool disposed within said housing for carrying at least one 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 at least one opening in said housing and wherein said curvilinear upper head surface extends outwardly and downwardly over and about an upper portion of said spool and said spool defines a 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 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 in the direction of rotation along nonlinear paths from an upper portion of said upper head surface to a lower portion thereof.