Patent ID: 6834746
Filing Date: 2004-12-28
Classification: B60B,Y10T

Abstract:
A caster brake system comprising:a connection unit having a connection plate on a top thereof and a tubular member connected to an underside of the connection plate, an upper cam rotatably received in the tubular member and having a serrated underside which includes first protrusions, a lower cam movably received in the tubular member and having a serrated top which has second protrusions, the lower cam being moved downward when a peak of each of the first protrusions contacts a peak of the second protrusion corresponding thereto, a disk connected to an underside of the lower cam and having teeth on an outer periphery thereof; a frame unit having a frame having an open top so as to receive the lower cam therein and a hole defined through a bottom of the frame, a plurality of notches defined in an inner periphery of the hole so as to match with the teeth of the disk when the disk is moved toward the hole, two plates connected to an underside of the frame and wheel support arms extending from the two plates; a braking unit having a pushing member pivotably located between the two plates and a first end of the pushing member being pushed by the underside of the lower cam, a braking member pivotably mounted to the two plates and a first end of the braking member being pushed by a second end of the pushing member, and a wheel unit connected to the wheel support arms and having an annular shoulder surface, a second end of the braking member contacting the shoulder surface when the first end of the braking member is pushed by the second end of the pushing member.