Unit for protecting the blade of a rotary-blade scrub-clearing t

Details Unit for protecting the blade of a rotary-blade scrub-clearing t Unit for protecting the blade of a rotary-blade scrub-clearing t

1988-12-30

1990-04-17

Yost, Frank T.

Cutlery

Cutting tools

With blade moving means

30285, 30390, 30121, 56174, 56DIG20, A01D 3467, A01D 7518

Patent

active

049168134

ABSTRACT:
In a scrub-clearing tool of the type comprising a tube, a blade supported for rotation at one end of the tube, a motor for driving the blade and transmission shaft for connecting the drive motor to the blade, a disc is provided for protecting the blade and is mounted for rotation on the shaft of the blade with the interposition of a bearing. The protective disc has a diameter larger than the outer diameter of the blade and has a plurality of recesses around its periphery, the inner edges whereof are spaced from the center of the disc by a distance less than the radius of the outer circumference of the blade. The protective disc is normally rotated together with the blade. It stops when it comes into contact with the ground or with some obstacle, while the blade can continue to rotate by virtue of the presence of the bearing. The disc therefore protects the blade from impacts with obstacles, protects the operator from accidental direct contact with the blade, and finally prevents the cutting of woody stems of a diameter greater than the width of the recesses. In fact, larger stems cannot penetrate these recesses and hence are not cut by the blade.

REFERENCES:
patent: 2197561 (1940-04-01), Orr
patent: 2832184 (1958-04-01), Beuerle
patent: 2883746 (1959-04-01), Gilsi
patent: 4205510 (1980-06-01), Raniero
patent: 4586322 (1986-05-01), Yokocho et al.

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