Actually, the pumps used to balance the air pressure on bicycles, present big discomfort because they are not fixed and require a lot of physical effort, in same cases not being able to be used by children.

With the intent to solve such inconveniences, the present project was developed. Through a mechanic drive system, this product seek for decreasing the effort applied by the user and as a complement, the pump is fixed to the bicycle eliminating the discomfort to balance the air pressure in the tires.

Such pump is composed with one frame fixed on the bicycle, one transmission component that pushes a piston located inside the frame, compressing the air, so the air pass through a valve that prevents the reflux and then the air is brought to the tire through a hose that has a clamp connected to the system at the valve of the tire.

This project can be better understood through the following detailed description according to the designs attached where : FIGURE 1 - represents a lateral view of the product and its fixation on the bicycle.

FIGURE 2 - represents the details of the frame.

According to these pictures, it's possible to see the body (3) connected to the bicycle (13) by one fixing component (2), and one retention valve (1) that prevents the air to go back to the body (3). To this valve (1) is connected one hose (11) that has one clamp (12) that conducts the air to the tire. Inside this body (3), there is one spring (4) that makes the piston (6) to come back.

Inside the piston there is one retention valve (14) and outside it there is one

stumbling block component (5). The transmission of movement until the piston (6) is made through an axle (7) which has one follower (8) in its end that receives the movement from the transmission component (9) attached to the pedal axle of the bicycle (10).

The fixation of this pump in the bicycle is made through one fixing component near the wheel hub axle of the bicycle where the transmission component is fixed. The pump matches to any type of bicycle without major problems.

The operation of the this pump consists in compress the air that is at atmospheric pressure through one component (3) and one piston (6) taking the air to the tire through one hose (11). This procedure is made by the following <BR> <BR> <BR> <BR> way : the axle (7) should be placed at state"B" (working state), the hole should be attached to the valve of the tire through the clamp (12), then the user has to turn the pedal backward so this procedure will make the transmission component rotate (9) putting the piston in movement (6) through the contact with the follower (8) ; on a descendent movement of the piston (6) aided by one spring (4) the piston takes the air through the retention valve (14) ; at ascendant movement (compression) the retention valve (15) closes, allowing the air compression that goes through the retention valve (1). On this process the stumbling block component (5) has the function to improve the performance of the pump preventing the air to escape through the lateral of the piston (6), after passing for the retention valve (l) that has the function to avoid the air to come back to the frame. The air goes inside the tire through the hose. This ascendant and descendant movement is performed until the balance of air pressure on the tire is completely done and by the end of the balance of the air pressure the user put the axle (7) at state"A" (sleep state) and then uncouple the clamp of the tire.