Background Art A trampoline is an exercise equipment that enables a person to spring up, using the resilience of a special synthetic resin attached by springs to a steel frame. It is widely used for training of gymnasts or as a play equipment for children. Since trampolining was adopted as an official event of gymnastics in 2000 Sydney Olympic Games, the recognition for trampoline and trampliners have been increasing.

However, beginners easily fall over because it is difficult to balance themselves, and cannot feel thrilling pleasure because the rebounding height depends on the weight of a user. Dangerous accidents also happened because gymnasts or general users often fell down outside of a trampoline. For these reasons, there have been several problems in popularizing it as a leisure equipment.

Disclosure of the Invention The present invention was created to eliminate the problems and inconveniences as described above, comprising auxiliary side rope R2 and R2', a central driving rope R1, an auxiliary harness D connected thereto, a central driving unit MI to wind up the central driving rope R1 in order to vertically move a user up and down to a certain height, a driving unit pole C, auxiliary driving units M2 and M2'to wind and unwind auxiliary side ropes R2 and R2'equally in both sides of the trampoline A according to the change of height in order to keep a user's balance, and supporting poles B and B'having height sensors S and with their tops connected to each other, so that a user can jump to a desired height by operating a height controller T connected to the main driving unit M1. The present invention will enable general users to enjoy trampolining as a leisure activity and help gymnasts train safely by preventing accidents. In addition, it will greatly contribute to popularizing trampoline A and promoting trampolining as a leisure activity for general people.

Brief Description of the Drawings FIG. 1 is a view showing the embodiment of a height-adjustable auxiliary equipment for trampoline according to the prevent invention; FIG. 2 is a perspective view of an auxiliary harness; FIG. 3 is a view showing the embodiment of the prevent invention.

Explanation of Symbols Used in the Drawings A: Trampoline B, B': Supporting poles C: Driving unit pole D: Auxiliary harness T: Controller M2, M2' : Auxiliary driving unit R1 : Central rope R2, R2' : Auxiliary side ropes 1: Side pulley 2,2' : Upper pulleys Best Mode for Carrying Out the Invention FIG. 1 illustrates an embodiment of the present invention comprising supporting poles B and B'outside a trampoline A, their tops being connected to each other, and auxiliary driving units M2 and M2' at the bottoms thereof to wind both auxiliary side ropes R2 and R2' equally. Auxiliary driving units M2 and M2'serve as a balancer by automatically winding auxiliary side ropes R2 and R2'when a user jumps up. Each auxiliary driving unit is one generally used, in short, comprising a motor, a clutch, a gear brake, a wheel, and a main frame.

The motor is in the state of continuously rotating in a specific force, and the driving units are actuated to tighten auxiliary side ropes R2 and R2'when a user rebounds up from the trampoline A and a tension of auxiliary side ropes R2 and R2'becomes weak. That is, the auxiliary driving units M2 and M2'leave motors running in an equal force and they are actuated to wind the auxiliary side ropes R2 and R2'through side pulleys 1 and 1', mounted on the upper part of both supporting poles B and B', and to keep a user's balance, when the tension of the auxiliary side ropes R2 and R2'becomes weak after a user jumped up.

The supporting poles B and B'have height sensors S at specific heights which function to check if the controller T connected to the main driving unit MI works properly by detecting height at all times.

A driving unit pole C is installed along the central line between supporting poles B and B'and to the rear of the trampoline A. There is the main driving unit MI at the bottom thereof, which serves to wind the central driving rope R1 connected to the auxiliary harness D and is connected to the controller T for controlling a user's jumping height.

The main driving unit M1 starts running when the tension of the central driving rope R1 becomes weak after a user selected a desired height through the controller T and then jumped up. At this time the motor of the main driving unit MI rotates by a selected height, and the central driving rope RI connected to the auxiliary harness D is wound to the inside of the main driving unit MI through upper pulleys 2 and 2'mounted on a bar connecting both tops of the supporting poles B and B'to each other and another upper pulleys 2 and 2'mounted on the driving unit pole C.

Once the motor of the main driving unit MI rotated by the preset number of rotations, it automatically stops rotating, and the central driving rope Rl wound to the inside of the main driving unit MI is wound off from the inside of the main driving unit MI through the driving unit pole C and upper pulleys 2 and 2'because of the gravity of a user. Accordingly, a user raised to a selected height falls on the trampoline A again. At this time the auxiliary side ropes R2 and R2' are wound off from the auxiliary driving units M2 and M2'through the supporting poles B and B'and side pulleys 1 and 1'. When a user rebounds after falling on the trampoline A, the tension of the auxiliary side ropes R2 and R2'and central driving rope RI becomes weak and the auxiliary driving units M2 and M2'and main driving unit MI repeat working as described above.

FIG. 2 illustrates an auxiliary harness D that a user wears when using the auxiliary equipment for trampoline of the present invention.

The auxiliary side ropes R2 and R2'are connected to both shoulder portions of the harness D, and the central driving rope RI to the upper back portion of the harness D. The harness D uniformly disperses the lifting force over the body of a user in order to help the user keep his balance.