False-brake prevention device

1. A false-brake prevention device comprising:

a wheel shaft;

a wheel hub rotatably disposed on the wheel shaft and having a brake tooth structure;

a brake base connected to the wheel shaft;

a brake pedal pivotally connected to the brake base and having a brake lever for engaging with the brake tooth structure;

at least one positioning structure formed on one of the brake pedal and the brake base and having a lock slot, a release slot and an elastic portion formed between the lock slot and the release slot, a first return region, a second return region and a transition region being formed on a side surface of the elastic portion facing the one of the brake pedal and the brake base, the transition region being protruded toward the other one of the brake pedal and the brake base, the first return region being connected to the transition region and the lock slot with a gradually reducing height relative to the side surface from the transition region to the lock slot, the second return region being connected to the transition region and the release slot with a gradually reducing height relative to the side surface from the transition region to the release slot; and

a protruding pillar formed on the other one of the brake pedal and the brake base and protruded toward the one of the brake pedal and the brake base to abut against the elastic portion for pushing the elastic portion to deform outwardly and for engaging with the lock slot or the release slot, the elastic portion tending to move relative to the protruding pillar along the first return region by elastic deformation of the elastic portion when the protruding pillar pushes the elastic portion to deform outwardly and the protruding pillar contacts with the first return region, so as to cause the protruding pillar to be engaged with the lock slot and cause the brake lever to be engaged with the brake tooth structure, and the elastic portion tending to move relative to the protruding pillar along the second return region by the elastic deformation of the elastic portion when the protruding pillar pushes the elastic portion to deform outwardly and the protruding pillar contacts with the second return region, so as to cause the protruding pillar to be engaged with the release slot and cause the brake lever to be disengaged from the brake tooth structure.

2. The false-brake prevention device of claim 1 , wherein the first return region is an inclined surface.

3. The false-brake prevention device of claim 2 , wherein an inclined angle of the first return region is between 15° and 60°.

4. The false-brake prevention device of claim 1 , wherein the first return region is an arc-shaped surface.

5. The false-brake prevention device of claim 1 , wherein the second return region is an inclined surface.

6. The false-brake prevention device of claim 5 , wherein an inclined angle of the second return region is between 15° and 60°.

7. The false-brake prevention device of claim 1 , wherein the second return region is an arc-shaped surface.

8. The false-brake prevention device of claim 1 , wherein the position structure further has a sliding slot communicated with the lock slot and the release slot.

9. The false-brake prevention device of claim 1 , wherein the elastic portion is an elastic tongue sheet.

10. The false-brake prevention device of claim 1 , wherein both two sides of the brake pedal have the lock slot and the release slot formed thereon, and two sides of the brake base have the protruding pillar respectively for engaging with the corresponding lock slot or the corresponding release slot.