Castor braking and stopping rotating simultaneously

摘要

A castor includes 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. Thus, when the castor is locked completely, the roller is entirely locked by the locking unit so that the roller cannot roll and translate and cannot be turned around simultaneously so as to provide a double-braking effect. In addition, when the castor is locked partially, the roller is partially locked by the locking unit so that the roller cannot be turned around but can roll and translate freely.

主权项

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.