Locking mechanism for sets of castors supporting apparatuses, machines, or furniture

Claim 1

In a locking mechanism for sets of castors of the kind, in which the castor wheel is journalled in a fork being able to revolve on a tubular wheel carrier, the improvement which consists in each of the tubular wheel carriers enclosing a tubular part of a locking member, slidingly fitting into the tubular wheel carrier, said tubular part of the locking member being able to move up and down, but not to revolve in said tubular part of the wheel carrier, the tubular part of the locking member carrying a brake flange at the underside which can be brought to bear against the wear surface of the castor wheel in one extreme position of the movement of the locking member, and against the wheel fork in the other extreme position to prevent the latter from revolving, the locking members being pairwise served by means of a lever system being designed as a toggle press, wherein the lever system acting on a pair of castors comprises a short, nearly vertical lever at each castor wheel, one end of said lever being pivotable on a pivot horizontally mounted in the tubular part of the locking member, a connecting rod between the other ends of said short vertical levers and pivotably connected to said ends of the short levers being movable in its longitudinal direction, and a roller being mounted adjacent each of the thus established toggle links, said rollers having runways on the bottom side of a frame carrying the castors.