Patent ID: 6327742
Filing Date: 2001-12-11
Classification: B60B,Y10T

Abstract:
A castor apparatus for attachment to a trolley comprising:a bearing for attachment to a trolley and having a generally vertically extending castor vertical axis;a bracket assembly retained by said bearing and rotatable about said castor vertical axis, said bracket assembly including at least one generally horizontally extending shaft having a stop at either end thereof;at least one wheel rotatably mounted on an axle for engaging and rolling along a surface; anda mounting means attached to said axle and engaging said shaft for permitting free movement of said wheel and said axle in a generally horizontal plane along said shaft between both said stops transverse to said castor vertical axis within a predetermined area surrounding said castor vertical axis, said mounting means including at least one pulley attached to said axle and having a peripheral groove engaging said shaft, whereby when said bearing is attached to a trolley, said wheel and said axle trail said castor vertical axis along a path of travel of the trolley and said wheel is prevented from wedging and/or fishtailing upon reversal of a direction of the trolley along the path of travel.