Patent ID: 8418315

Claim:
A combination castor brake system, comprising: a linking device; and a plurality of castor assemblies connected with the linking device; wherein each of the castor assemblies comprises: an operation unit; a braking unit connected with the operation unit; and at least one roller connected with the braking unit; the operation unit of each of the castor assemblies includes: a mounting seat having an interior provided with a slideway; a slide slidably mounted in the slideway of the mounting seat and having a first end provided with a connecting portion pivotally connected with the linking device and a second end provided with a pressing ramp; and at least two limit rods each extended through the mounting seat and the slide; the mounting seat of the operation unit has two opposite sidewalls each provided with at least two through holes to allow passage of the limit rods; the slide of the operation unit has two opposite sidewalls each provided with at least two elongate limit slots slidable on the limit rods; the limit rods of the operation unit in turn extend through the through holes of the mounting seat and the limit slots of the slide; the connecting portion of the slide is driven by the linking device so that the slide of the operation unit is movable in concert with the linking device; the braking unit of each of the castor assemblies includes: a housing rotatably mounted on the mounting seat of the operation unit; a top cap mounted on the mounting seat of the operation unit; a control shaft movably mounted in the housing and having an upper end provided with a head pressing the pressing ramp of the slide and a lower end extended into the housing; an elastic member mounted on the control shaft and biased between the mounting seat of the operation unit and the control shaft; and a braking member secured on the lower end of the control shaft to move in concert with the control shaft and having a bottom provided with a braking portion that is movable to engage the roller; the braking member of the braking unit is received in the housing; the roller of each of the castor assemblies is rotatably mounted on the housing of the braking unit and is disposed under the braking portion of the braking member.