CA2451883A1 - Improved lawn mower - Google Patents

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

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.

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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, 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 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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Claims