NEED FOR INVENTION:
Since bicycles have existed for so long, we take for granted their construction and usefulness. We normally use the bike for transport, leisure & as an exercising equipment. Under careful consideration,we can find enormous potential for many other uses.The drawbacks of existing construction are:  
Only our legs get enough exercise due to cycling. We need to balance the cycle on its 2 wheels while we drive, which takes the leisure part away. Safety of the rider in a traffic is also an issue.

THE PROPOSAL OF INVENTION:
The proposal of this invention is that we bring in the pleasure factor in the leisure drive, improve the safety and also increase the effectiveness of exercising due to cycling.

THE INVENTION:
The invention in the cycle is implemented near the Front Wheel side and from Rear Pedal to Rear Wheel construction, it remains the same as existing cycle construction.
This cycle is mobile with 2 Front wheels & 1 rear wheel.The Front wheels have a separate Sprocket and Freewheel drive (just like for normal Cycle rear wheel). The Front wheel is driven through the Sprocket and rotated by hand (normally one hand only, if anyone is adventurous, then both!). Separate steering tube available for guiding the Front Wheel while riding with hand or negotiating a curve.

THE ADVANTAGE:

The construction is normally Aluminium tubes and use all lightweight parts and materials whereever it is required . With weight advantage gained through Aluminium tubes & parts, it will be easier to navigate the streets without much strain. Because of the construction of the Tri-Cycle and the concept, the following benefits are envisaged.
We can drive both the Front wheels and Rear wheel at the same time which involves legs and upper torso of the human being. This enables complete muscular involvement of a human body and hence “Complete Exercise” through the Cycle.
The 2 wheels in front are a great stabilising factor in riding the Tri-Cycle. Now a rider can focus on the “Pleasure Factor in a Leisure” ride, with balancing of the cycle being eliminated.
The greatest advantage is the safety of riding a cycle, now families can be at peace even though their member out enjoying their ride with these Tri-Cycles.
With advanced mechanisms, like gears , motors, Carbon material for tubes, better control can be provided for riding with increased comfort.

THE DISADVANTAGES:
Initial investments will be high, since we would need to provide a good value proposition with this product.
Not targeted at mass market.

THE BUSINESS:
This product will have a Virgin Market. My limited Internet search has not shown any such product existing in the market at present.
This product will be targeting the high end of the market where Customers are well-off and looking for adventure.