IMPROVED LAWN MOWER

TONDEUSE A GAZON AMELIOREE

English Abstract

A reciprocating self propelled cutting device used primarily to cut grass. The
rotary motion of the
caning wheels transforms this motion through a system of
gears, shafts and levers into back and forth motion known as reciprocating
motion. In this
invention the specific use is for cutting vegetation using blades which
are in a parallel position to the cutting surface and can be raised or lowered
to a desired cutting
height. The mower uses a handle assembly in which the
operator pushes or pulls to control the direction of the mower assembly. The
mower may use
different operators which provide his or her own strength to control
the mower. The grass or vegetation to be cut is done so by the back and forth
action of the
cutting blades as the operator guides the mower through the grass
thereby catching and shearing off the vegetation. The verticle standing
vegetation is trapped
between one stationary cutting blade and a moving blade of which
both are presented perpindicular to the vegetation. A cover over the cutting
blades may provide
protection to the operator.

Description

CA 02451883 2003-12-03
Primary F~caminer
Attorney, Agent, or Firm
DISCLOSURE
A reciprocating lawn mower primarily used to cut grass. Most lawn mowers use
rotary blade
motion as their principle mechnaics to cut grass. A reciprocating
fawn mower would use back and forth motion of the cutting blades to cut grass.
NATURE OF INVENTION
This invention relates to a reciprocating cutting blade set for cutting
various types of vegetation
primarily grass. Reciprocating motion is the attemateiy back
and forth movement of the cutting blades as in the example of a piston engine
where the
reciprocating pistons cause rotary moting in the crankshaft.
Difficulties with Existing Designs
Existing rotary motion mowers use a large swinging or open reel blade for
their means of cutting.
These larger open spaces between the cutting blades allow
objects to move more easi#y between them thereby posing an immediate danger to
the operator
should they become in contact with him or her. They also can
more easily become in contact with an object and project it at great speed and
in an uncontolled
manner and direction. The circular motion of the cutting blade
of a rotary mower aids in the projection of everything that it comes In
contact with. Rotary
mowers require large amounts of power since they use heavy steel
cutting blades to be mated at high speeds in which to cut grass. Rotary
cutting blades must be
kept very sharp since they rely on hitting the grass leaves with
their sharpened edge if they are to be efftcient. Should there not be a cover
over this rotating
blade, it would be extremely dangeous to operate. Often rotary
lawn mowers use industrial gas or eiedrtc motors as their primary source of
power. This is very
harmful to the environment causing air and noise pollution, in
some areas of the World they have been banned altogether. Rotary mowers are
also very heavy
and difficult to manuver over various types of terrain espeally
for smaller or older operators.

CA 02451883 2003-12-03
BACKGROUND O>= THE INVENTfON
This invention relates generally to those devises used for cutting vegetation,
refered to as sawn
and garden mowers and more particularly to a self propelled
lawn mower receiving it's power from a person pushing the device through the
grass. Most self
propelled "push" type mowers are of the open reel type which
have cutting blades that are mounted in a bent curved fashion. These mowers
derive their power
directly through the rotating drive wheels as the mower is
pushed or pulled along the ground.
SUMMARY OF THE INVENTION
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is the mower blade is comprised of a set of three flat steel pieces of
which two have cut
outs or notches and only one of these blades move.
FIG. 2 in the blade assembly the two cutting blades are held in position by a
third flat steel bar.
FIG. 3 the moving blade is positioned between the other two non moving pieces.
Only the center
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CA 02451883 2003-12-03
blade is sharpened and bevelled.
FIG. 4 a slot allows a pin to move back and forth between the upper bar and
the cutting blade.
FIG. 5 a pivot arm assembly transfers the rotary motion of the wheels into the
back and forth
motion of the blade.
FIG. 6 the wheel drive mechanics use two bevelled gears mounted perpendicular
to one another
which altow the rotary motion of the verticle plane to be
trasformed to rotary motion in the horrizonta! plane.
FIG. 7 the horrizontal gear has a hardened steel pin which is located off
center from the gears
center axel and is connected to a push rod arm. This offset
hardened steel pin allows the push rod arm to move back and forth as the gear
assembly rotates.
A bushing is provided around the steel pin.
FIG. 8 the push rod arm is connected to a further pivoting arm whch is
connected to the cutting
blade set. The "push pull" motion of the push rod arm is
transfered to the back and forth motion at the cutting blade through a
connecting pin attached to
the pivot arm.
FIG. 9 the main drive wheels allow the mower assembly to be driven over the
ground surface.
They are attached by steel axeis to the main mower frame
memebers.
F1G. 10 the mower push pull handle assembly is attached to the main mower body
by brackets
and fasteners wflch are bolted on each side of the mower
body.
FIG. 11 the handle bar assembly is made of three sections of bent round steel
tubing and are
bolted together to form the completed handle assembly. A foam
rubber hand grip is provided for the operator user whci is located on the
upper most handle
section.
FIG. 12 a safety guard cover is provided and is attached by steel scxevvs to
the lower main frame
assembly.
-- FIG. 13 two small blade height adjuster wheels are located at each end of
the cutting blade set
3

CA 02451883 2003-12-03
and are bolted to the main mower body.
FIG. 14 a cover is provided over the entire mower body therby giving it
protection from the
elements and providing safety to the operator.
FIG. 15 the blade set can be removed for repair or sharpening by unbolting it
from the lower
blade and frame assembly.
DETAILED DESCRIPTION OF THE PREFERED EMBODIMENTS
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