Pedal Operated Lawn Mover Cycle Download Report – Agricultural Mechanical Project

ABSTRACT
The design objective is to come up with an apparatus for cutting grass that is portable, durable, easy to operate and maintain. It also aims to design a pedal- powered Mower cycle. The pushing force required for moving the reel mower is obtained from the motion of a bicycle. The Mower cycle consists of three main wheels with two of the wheels at the front. Between the two front wheels a cutting mechanism is made with internal spur gear system which transfers the torque to the mower spiral mechanism. The cutting mechanism is made of a flat blade rigidly fixed to the frame behind the spiral arrangement which is configured to contact at least one reel bar of the spiral blades during the rotation of the spiral mechanism.

INTRODUCTION
Lawn mower is an essential tool for the maintenance of yards. They vary in size, mode of operation and power. The power source riding mowers for example are usually powered by a gasoline engine and are ridden and steered by the operator but they are costly. So our design objective is to come up with a Lawn mower cycle that is durable, cost efficient & easy to operate. The Lawn mower cycle is peddle powered. The power required to push the mover is obtained from a chain-driven cycle. This project attempts to combine a cycle and a mower.

There are primarily two types of mowers namely

(i) the reel mowers, and

(ii) the rotary mowers.

The reel (cylindrical) mowers seem to be better. Made of blades on a revolving cylinder, they achieve clean cut by scissors action. As the mower moves forward, the rotating blades come in contact with a stationary bar called the bed knife and placed parallel to the ground. Grass is held by the shearing action of the reel blades against the bed knife. The mower is adjusted to various cutting heights. Rotary mowers are often powered either by an internal combustion engine or an electric motor and are generally moved manually, with the engine only spinning the cutting blades.

RELEVANCE
The main aim of our project is to come up with a cost efficient lawn mower. A lawn mower is a machine used for cutting grass or lawns. A lawn is any area of grass; mostly tough grass which is neatly cut like in a private garden or a public park. Walk behind mowers are designed to be pushed by the operator and typically run on gasoline or electricity. Modern gas powered and electric powered lawn mowers cut grass with a single blade revolving at a high speed parallel to the ground.
Generally, in areas like ours, the conventional methods of grass cutting involved the use of cutlasses which never met the maximum satisfaction. More so, it is strenuous, time and labour intensive. Therefore, there is the need to develop a low cost mower which can take care of this operation easily. The objective of the study is to design and develop a locally fabricated peddle powered spiral blade lawn mower affordable by common man

THE BASICS IN GRASS CUTTING
Grass as most other plants grow during a certain period of the year. This can off course differ some depending on where in the world you are. For India, the grass starts to grow in April. From then to June the grass has its high season, which means it‘s grows fast and strong. During this period you can cut the grass 1-2 times a week. What you should think of is to take it easy in the beginning of the growth period as not to stress the grass. The grass is then entering a period of low growing rate, mostly due to the sun, drying the soil. You should take care not to cut the grass to short if the grass looks dry (turning somewhat yellow). A good rule is to cut about one third of the grass length at a time. The grass can be very sensitive and can be damaged if you cut too much at one time. Then we come to the length. Here it really depends on what kind o a lawn you‘re aiming for. If you want a lawn that you can walk on you should leave at least 4cm of the grass. There are different approaches to cutting the grass all with advantages and disadvantages.

Reel (cylinder )mowers
The reel (cylindrical) mower is made of blades on a revolving cylinder, they achieve clean cut by scissors action. As the mower moves forward, the rotating blades come in contact with a stationary bar called the bed knife and placed parallel to the ground. Grass is held by the shearing action of the reel blades against the bed knife.

The mower is adjusted to various cutting heights.

Typically, the cutting reels are ahead of the vehicle’s main wheels, so that the grass can be cut before the wheels push the grass over onto the ground. The reels are often hydraulically powered.

The main parts of a cylinder or reel mower are:
1. Blade reel/cylinder — consist of numerous (3 to 7) spiral blades that are attached to a rotating shaft. The blades rotate, creating a scissor-like cutting motion.
2. Bed knife — is the stationary cutting mechanism of a cylinder/reel mower. This is a fixed horizontal blade that is mounted to the frame of the mower.
3. Body frame — the main structural frame of the mower onto which the other parts of the mower are mounted.
4. Wheels — these help propel the mower in action. Generally, reel mowers have two wheels.
5. Push handle — the “power source” of a manually operated reel mower. This is a sturdy T-shape handle that is connected to the frame, wheels and blade chamber.
6. Motor — the power source of a reel mower that is powered by gasoline or electric.

FACTORS AFFECTING CLIP
1. The diameter of the reel
2. The number of reel blades
3. The speed of the reel
4. The ground speed
By following the blade path through two ―clips as the machine moves forward we can illustrate the actual process of cutting grass. The bed knife pushes grass toward the shear point while the reel blade gathers it in front. Each blade path has one-half clip in which to cut all the grass.

Lawn reel mover
Lawn reel mover

WORKING PRINCIPLE OF LAWN MOWER CYCLE
The cutting mechanism is made of a flat blade rigidly fixed to the frame behind the spiral arrangement which is configured to contact at least one reel bar of the spiral blades during the rotation of the spiral mechanism.

To understand reel cutting theory, we must understand the concept of clip and the shear point. A shear point is any single point of contact made between the reel blade and bedknife. Clip is the forward distance traveled between successive blade contacts at one shear point. The bedknife pushes grass toward the shear point while the reel blade gathers it in front. Each blade path has one-half clip in which to cut all the grass. The pushing force required to move the reel mower is given by the motion of bicycle.

APPLICATION
A lawn mower cycle is a machine used for cutting grass in lawns at the required height.

 ADVANTAGES
1. Low Cost
2. They are less dangerous than rotary mowers.
3. Require little maintenance.
4. Are environmentally friendly.
5. Produce little noise.
6. Are easy to transport and store.
7. Don’t stir up dust or emit harmful fumes.
8. Don’t fill debris around the yard.

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Pedal Operated Lawn Mover Cycle Download Report – Agricultural Mechanical Project

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