Patent ID: 11903339
Assignee: nan
Field: Other special machines (Mechanical engineering)
Classification: CPC A | IPC A

Claim 0:
1. A cutting head device for a flexible trimmer line mowing machine comprising:
a head enclosure comprising a housing and a lower cover, said housing having cylindrical walls concentric to an axis of rotation and including a central annular cylindrical pocket concentric to said housing 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, said head enclosure having peripheral apertures;
said lower cover releasable coupled to said housing to gain access to the interior of said head enclosure, wherein said lower cover comprises a cylindrical wall section and a radial wall section extending radially outwards from a central annular opening, and said lower cover comprising cooperatively interengagable rotation control means;
a knob disposed within said lower cover central annular opening and protruding axially downwardly from said lower cover central annular opening, 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; and
a spool rotatively disposed within said head enclosure around said housing axis of rotation for storing a flexible trimmer line, wherein said spool comprises at least one flexible trimmer line storage chamber delimited by at least two flanges and a hollow cylindrical core, wherein said hollow cylindrical core includes a central bearing surface for holding said spool rotationally concentric to said housing axis of rotation, and wherein said spool including a thrust surface for holding said spool axially constrained within said head enclosure under the biasing force of said spring means wherein said spool comprising coupling means to rotatively engage said knob to said spool;
wherein when said cutting head device is in a 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 head enclosure for constraining said flexible trimmer line from extending outside said head enclosure peripheral 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 head enclosure, 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.