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US 4,987,732 AGranted
Mowing apparatus having oppositely reciprocating cutters
AssigneeKomatsu Zenoah Co.
InventorsAkio Terai, Junichi Yoshino, Shinroku Satsumi, Mitsuru Taniguchi
Life of this patent
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Abstract
To mow even soft grass more tidily in shearing mode without kicking pebbles, a pair of two grass cutting wheels are pivotally driven by an engine in two mutually-different directions. One cutting wheel is slidably fixed relative to the other cutting wheel for safety. The mowing machine can be used in common to shear off grass on the ground and trim a garden tree by adjusting an angle between a hollow grip pipe and the machine cutting surface.
Claims20
A mowing apparatus driven by rotational motion supplied from a motive power source, comprising:
- a pair of first and second pivotal cutting wheels slidably superposed with each other, each of the wheels having a number of grass cutting edges and a central portion, the cutting wheels having two opposite sides facing away from each other;
- and
- means arranged on one of the two opposite sides of the cutting wheels for reciprocatingly rotating said cutting wheels in opposite directions through a predetermined angle, respectively, wherein said rotating means comprises:
- (a) a crank shaft rotatably driven by said motive power source,
- (b) a first shaft coupled to the central portion of said first wheel,
- (c) a second shaft coupled to the central portion of said second wheel and being of a hollow cylindrical configuration, said first shaft being rotatably and coaxially inserted into said second shaft, and
- (d) a crank lever mechanism provided between said crank shaft and said first and second shafts for converting the rotational motion of said crank shaft into two oppositely directed reciprocatingly rotational motions of said first and second shafts to reciprocatingly rotate the first and second cutting wheels relative to each other about a common axis of said shafts through the predetermined angle.
4 more elements
A mowing apparatus, comprising:
- a motive power source for driving the apparatus;
- a pair of first and second pivotal cutting wheels slidably superposed with each other and each having a number of grass cutting edges and a central portion, said cutting wheels having opposite sides facing away from each other;
- and
- means arranged on one of the opposite sides of the cutting wheels for reciprocatingly rotating each cutting wheel in opposite directions through a predetermined angle, respectively, wherein said rotating means comprises:
- (a) a crank shaft operatively connected to and rotatably driven by said motive power source,
- (b) a first shaft coupled to the central portion of said first wheel,
- (c) a second shaft coupled to the central portion of the second wheel and being of a hollow cylindrical configuration, said first shaft being rotatably and coaxially inserted into said second shaft, and
- (d) a crank lever mechanism provided between said crank shaft and said first and second shafts for converting rotational motion of said crank shaft into two oppositely and reciprocatingly rotational motions of said first and second shafts to reciprocatingly rotate the first and second cutting wheels relative to each other about a common axis of said shafts through the predetermined angle.
5 more elements
Dependencies are inferred from the claim text.