Head for a rotary line trimmer apparatus
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United States of America Patent
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May 26, 2009
Grant Date -
Jul 3, 2008
app pub date -
Jan 3, 2007
filing date -
Jan 3, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An improved head for a flexible line trimmer apparatus is provided. The improved head includes a metal tubing that extends through the head and surrounds a cutting line of selected length. The tubing is provided with a flared exit portal increasing the efficiency of the head. The contact surface eliminates the possibility of the cutting line fusing to plastic surfaces due to heating caused by friction. The head is surrounded with an interior perimeter counterweight to store kinetic energy on each end having a parabolic surface of revolution concentric with the axis of the tubing. A replaceable cartridge is provided to increase the ease of maintenance and the useful life of the head.
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