EXCERPTS FROM THE PATENT APPLICATION

BACKGROUND OF THE INVENTION
The present invention relates to sports shoes, and more particularly, to sports shoes for training physical strength with heavy weight by inserting heavy material into the sole of the sports shoes, thereby training for physical strength.
                                                                                        
Conventionally, people, in general, or athletes specifically reinforce muscles of the lower part of the body while training their strength by tying gaiters or sandbag at the calf of the leg, for the sake of training for physical strength.  However, inconvenience occurs in putting the gaiters or the sandbag on and off in usage.

In order to solve the above problem, shoe weight is increased by inserting heavy material (such as iron beads and metal plates) into the inner of the out sole of shoes.  A small problem is caused, however, in manufacturing or using this type of shoe.  Namely, the shoes manufactured with iron beads mixed with the bond at the inner of the out sole thereof generates unbalance in the weight  because of not inserting the iron beads with given intervals there into as well as needing many manufacturing steps for molding.  Also, the shoes for training physical strength by inserting metal plate into the inner of the out sole thereof as disclosed in Korea Laid-Open Utility Model No. 98-55768 have small elasticity and generate inconvenience in action of the feet.  Damage, such as fracture of the toes and ankle or accumulating fatigue at the feet can also occur.
 
SUMMARY OF THE INVENTION
It is therefore an object of the invention for solving the above problem to provide shoes for training physical strength by inserting weight into the inner of the bottom sole of the shoes so as to heighten elasticity and increase flexibility thereby not causing damage at the feet.

It is another object of the present invention to provide shoes for training physical strength with inserting rubber material into the inner of the uppers of the leather shoes, thereby reinforcing the elasticity.

These and other objects can be achieved according to the present invention with sports shoes for training physical strength which are divided into the uppers, middle layer of a shoe sole, and the bottom sole, including:  a rubber seat inserted at both sides and the back of the uppers;  a high-elastic sponge adhered at bottom surface of the middle layer thereof;  and, a plurality of holes widely distributed at the upper surface of the bottom sole, a spring engaged to the bottom sole, a first space and a second space shaped to the fore and the back of the bottom sole, metal tubes engaged with given intervals between the first and second spaces, and polyurethane charged between the metal tubes.

As may be apparent from the foregoing, the present invention can heighten the efficiency in the exercise with inserting the weight material into the inner of the shoes, wherein the above weight material can protect the bond fracture below the ankle in the exercise because being flexible and widely distributed springs increase the cushion force thereby protecting the ankle from the impact at the ground.  Further, the rubber seat engaged between the uppers can mitigate the impact from the external and prevent the water from being penetrated.  Furthermore, it has advantage in that the shoes can be maintained to original shape with not being crushed.