Patent ID: 9139044
Filing Date: 2015-09-22
Classification: B60B,Y10T

Abstract:
1. A castor comprising: a castor body; an operation unit connected with the castor body; a locking unit connected with the castor body; a roller mounted on the castor body; and a mandrel extended through the castor body and the roller: wherein: the castor body has an interior provided with a chamber; the operation unit includes: a housing; a support tube mounted in the housing; a control shaft mounted in the support tube; a slide connected with an upper end of the control shaft; a first spring mounted on the slide and biased between the slide and the support tube; a pressing member mounted on a top of the slide; a cam block located above the slide and rotatable to press the slide; and an operation handle extended through the housing and the cam block; the control shaft has a lower end extended into the chamber of the castor body and provided with a driving portion; the locking unit includes: an elastic braking plate mounted on the castor body; a rivet extended through the castor body and the elastic braking plate; a brake stop block mounted on the control shaft and movable to abut the elastic braking plate; and a second spring biased between the castor body and the elastic braking plate; the elastic braking plate has a first end provided with a braking portion and a second end provided with a mounting portion for mounting the second spring; the elastic braking plate is provided with a pivot portion mounted on the rivet; the elastic braking plate has a side provided with a plurality of locking teeth; the brake stop block has a center provided with a driven hole secured on the driving portion of the control shaft; and the brake stop block is located above the elastic braking plate and has a bottom provided with a plurality of toothed grooves.