Patent ID: 8531837

Claim:
A pad mechanism comprising: a step fixing structure comprising a plurality of step platforms surrounding to a hole, a height difference being formed between two step platforms of the plurality of step platforms, a first engaging portion being formed on each of the platforms; a pad component installed in the step fixing structure in a detachable manner, the pad component comprising: a pad body, whereon at least one second engaging portion is formed for selectively engaging with the corresponding first engaging portion of the plurality of the step platforms so as to adjust a height of the pad body protruding from the step fixing structure; a sleeve with an end connected to the pad body and disposed through the hole; and a constraining portion connected to another end of the sleeve; a resilient component sheathing with the sleeve for driving the sleeve to move inside the hole; and a constraining component installed on an end of the resilient component and connected to the constraining portion so as to prevent the resilient component from separating from the sleeve.