A cutting head device for a flexible trimmer line mowing machine comprising:
- a housing having cylindrical walls including a pair of diametrically opposed apertures for allowing each end of an associated flexible trimmer line to protrude therethrough and a central annular cylindrical pocket;
- said housing comprising an axis of rotation, a keyed threaded coupler disposed within said housing central annular cylindrical pocket, where said keyed threaded coupler comprising a threaded end for attaching said housing to said flexible line trimmer mowing machine, and a thrust face opposite to said threaded end;
- a lower cover releasable coupled to said housing to gain access to the interior of said housing, wherein said lower cover comprises a cylindrical wall section and a radial wall section extending radially outwards from a central annular opening of said lower cover, and said lower cover comprising cooperatively interengagable rotation control means;
- a knob disposed within said central annular opening of said lower cover and protruding axially downwardly from said lower cover central annular opening, wherein said knob comprises a peripheral wall portion circumscribing said housing axis of rotation, said peripheral wall portion having an external face and a radially extending knob flange projecting from said peripheral wall portion external face, wherein said knob is rotationally and axially movable relative thereto between an extended position and a retracted position, where spring means are provided for biasing said knob towards said extended position, and said knob comprising cooperatively interengagable rotation control means;
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- a spool rotatably disposed within said housing around an axis of rotation for storing the flexible trimmer line, said spool comprising a hollow cylindrical core including a hollow cylindrical core peripheral surface and two end faces, a central cavity concentrically disposed within said hollow cylindrical core, said central cavity having an open face, a closed face and a cylindrical wall section concentric to said hollow cylindrical core peripheral surface, said closed face for providing a thrust surface, said central cavity cylindrical wall section for rotatively engaging said spool to said housing, extending axially and radially from a first end face of one of said two end faces of said hollow cylindrical core is disposed an upper hollow cylindrical flange, and extending axially and radially from a second end face of the other of said two end faces is disposed a lower cylindrical flange, said lower cylindrical flange having an inner face and an outer face, where said lower cylindrical flange comprising a flexible trimmer line guide sandwiched between said lower cylindrical flange inner face and said lower cylindrical flange outer face, said spool lower cylindrical flange outer face comprising means to rotatably engage said knob to said spool and to receive an end of said spring means which biases said spool central cavity closed face against said keyed threaded coupler thrust face;
- wherein when said cutting head device is in normal operation, said knob cooperatively interengagable rotation control means in cooperation with said lower cover cooperatively interengagable rotation control means locks said spool from rotation relative to said housing for constraining said flexible trimmer line from extending outside said housing apertures, and when said knob is shifted from said extended position to said retracted position and back to said extended position, segments of said flexible trimmer line are released outside said housing, and when said cutting head device is in a condition to be refilled with a new flexible trimmer line, said knob cooperatively interengagable rotation control means in cooperation with said lower cover cooperatively interengagable rotation control means allow said knob to be manually rotated in one direction relative to said lower cover for winding said new flexible trimmer line into said spool, being the winding direction of rotation opposite to the spool rotational direction in which new segments of said new flexible trimmer line are released.