Cutlery – Cutting tools – Plural cooperating blades
Patent
1989-04-17
1991-01-29
Watts, Douglas D.
Cutlery
Cutting tools
Plural cooperating blades
30180, B23P 1904
Patent
active
049876805
ABSTRACT:
A versatile tool for cutting woody vegetation or other materials which can be adapted for use as either: a hand held, hydraulically actuated lopping shear for use within the operator's normal reach; or, a powerful pole pruner for cutting at a distance when the shear is attached to an extension mechanism. The lopping shear has a basically tubular body which is gripped with one hand while cutting force is applied to an axial piston by the other. The operator's effort is multiplied by hydraulic fluid acting between a smaller piston driven directly by the operator and a larger piston attached to a sliding blade working in opposition to a hook structure fixed to the shear body. Work located beyond easy reach can be cut by attaching the lopping shear to the extension mechanism. This mechanism has a quick action coupling to lock the shear to one end of a tube containing another concentric, sliding tube which transmits to the shear, cutting force applied by the operator to a handle at its opposite end.
REFERENCES:
patent: 2714250 (1955-08-01), Twedt
patent: 2932892 (1960-06-01), Offner
patent: 3041725 (1962-07-01), Harries
patent: 3922782 (1975-12-01), Lind
patent: 4198748 (1980-04-01), Lewis
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