Patent ID: 7182178

Claim:
A brake caster with a stroke adjustment mechanism, comprising: a retainer having a center hole; a king pin held by the retainer and having outward threads formed around a neck thereof; a spring coil fitted onto an upper part of the king pin, the king pin being first fitted with the spring coil and then being inserted through the center hole of the retainer; a catch/release button having a top flange, a blind hole formed at a center axis, and multiple lock pins disposed on a back side of the flange and extending downward; a catch spring placed in the blind hole of the catch/release button; a brake pad having a step structure, and having an inner ring having a plurality of pin holes; a plunger block having a center hole that leads to the brake pad and which receives the catch/release button, inner walls of the plunger block defining a polygonal ring, the brake pad being installed on a bottom end of the plunger block, the plurality of pin holes of the brake pad corresponding to the lock pins on the catch/release button when the catch/release button is inserted into the plunger block; and a polygonal lock nut with inward threads that engage with the outward threads of the king pin, and being disposed in the polygonal ring of the plunger block; wherein the catch spring is first placed in the blind hole of the catch/release button, and then the catch/release button is inserted through the center hole of the plunger block to allow the lock pins to be inserted into respective pin holes on the inner ring of the brake pad, and then the polygonal lock nut is fitted into the polygonal ring directly over the catch/release button in the center hole of the plunger block, and then the king pin fitted with the spring coil is inserted through the center hole of the retainer and the polygonal lock nut, and then the plunger block being fitted with the polygonal lock nut is slipped over the neck end of the king pin and twisted in to engage the outward threads of the king pin with the inward threads of the polygonal lock nut, when the plunger block and the catch/release button are assembled.