Mowing apparatus

Claim 1

A mowing apparatus comprising, in combination, an output axis and rotary power means mounted on supporting means, said output axis being rotatably connected with said rotary power means, a rotary disk-like casing detachably and coaxially secured to said output axis for rotation therewith in a cutting plane, said rotary disk-like casing including upper and lower disk members, said upper and lower disk members defining a chamber therebetween, at least one guide port provided at the periphery of the disk-like casing, said upper disk member having a circular depending wall at its periphery, said circular depending wall being formed with a small inward projection in each position where said guide port is provided, said lower disk member having an outer diameter smaller than the inner diameter of said circular depending wall and provided with inward recesses adapted for fitting engagement with each of said inward projections provided in said circular depending wall, whereby said lower disk member together with the coil of said string is contained within the hollow cylindrical inside of said upper disk member and locked for rotation therewith, at least one flatly coiled cutting string made of a high polymer synthetic material disposed in said chamber, a fixing member detachably secured to said output axis for fixing said coiled cutting string between said upper and lower disk member, said fixing member consisting of a bolt element detachably secured to said output axis and a nut element adapted for threading engagement with said bolt element, said bolt element having an upper enlarged polygonal head adapted for fitting engagement with a center polygonal recess provided in said upper disk member and a lower bolt adapted to extend through a center bore below said center polygonal recess in said upper disk member for threading engagement with said nut element, said nut element being shaped in the form of a cap, whereby upon the fastening of said nut element onto said bolt, said upper and lower disk members together with the coil of said string will be tightly fixed and locked for rotation with said output axis, said cutting string extending through said guide port out of said rotary disk-like casing to form a cutting flail with an effective working length in said cutting plane during rotation, said chamber defined by said upper and lower disk members being smaller than the thickness of said cutting string, each coil of said cutting string being connected with the adjacent coils thereof so that when the free end is pulled out the outermost coil can be stripped therefrom without disjoining the entire coil.