Patent ID: 8474838

Claim:
A hidden braking device installed on an adjustable walking aid including a braking grip, a braking unit controlling a rolling state of a wheel set, and a connecting unit connecting said braking grip with said braking unit; wherein, said connecting unit is disposed inside said walking aid, and said walking aid has an upper frame and a lower frame that are suited to each other; said connecting unit having an upper shaft connected to said braking grip, a lower shaft connected to said braking unit, an adjusting seat connecting said upper shaft with said lower shaft, a moving member slidably disposed in said adjusting seat, and a fastening unit disposed out of said walking aid, correspondent with said moving member; a plurality of fixing slots being equidistantly defined on said upper shaft for satisfying an insertion of said moving member; one end of said moving member being provided with a magnetic member, and the other end of said moving member being provided with a propelling member which is disposed relative to said fixing slots; said fastening unit being magnetic for attracting said magnetic member, thereby allowing said moving member to displace for making said propelling member steadily insert and fix on any of said fixing slots.