Rotary grass cutting head

Details Rotary grass cutting head Rotary grass cutting head

1994-12-12

1996-02-27

Watts, Douglas D.

Cutlery

Blades

Rotary

30276, B26B 2500

Patent

active

054937850

ABSTRACT:
A heavy-duty, long-life, light-weight, replaceable rotary cutter head accessory for attachment to a rotary member of a vegetation trimmer is provided by this invention. The invention is characterized by several novel construction features that give the head superior cutting performance. For example, its construction is of two cylindrical coaxially nested cup-like head members with several sets of symmetrical apertures about the rim for retaining extending cutter members. The head members are constructed of light weight and extremely durable plastic, namely ultra high molecular weight polyethylene which has long wearing qualities. With apertures located in the two separate rim members, the head may be adapted for either flexible cord or rigid cutting members. The rigid cutting members are 16 or 20 penny nails, which wear a long time before encountering excessive wear in the special plastic head members. The nail heads are anchored between the rims of the two members, which are mounted by a bolt through a coaxial aperture in the respective cups. The assembly is easily removed to replace damaged nails or to relocate nails in new unworn apertures after long service intervals. Flexible cord cutter pairs are inserted through apertures in the inner cup rim which extends beyond the outer cup rim, placed for easily changing without unfastening the nested cup-shaped head members. By using two short lengths of cord mounted symmetrically dispersed about the head, less cord is used and higher speed cutting is an advantage over conventional longer cords. Dual cutter members of this head efficiently and effectively cut and trim both ordinary grass and heavier vegetation.

REFERENCES:
patent: 2888993 (1959-06-01), Dunning
patent: 3684027 (1972-08-01), Crawford
patent: 3684028 (1972-08-01), Crawford
patent: 3900071 (1975-08-01), Crawford
patent: 4756146 (1988-07-01), Rouse
patent: 5430943 (1995-07-01), Lee

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