Patent ID: 7017228

Claim:
A caster which comprises: three dual wheel swivel casters each comprising two wheels; a caster plate assembly; a pneumatic cylinder; and a device to lock said wheels wherein: a) each dual wheel swivel caster is mounted on the caster plate assembly such that said dual wheel swivel casters do not have undue motion when said device to lock said wheels locks said wheels; b) the caster plate assembly is swivel mounted on the cylinder; c) the device to lock said wheels is adapted to lock said wheels; d) the caster plate assembly comprises; i. an upper plate; ii. a lower plate; and iii. at least one stand off pin; e) and where the device to lock the wheels comprises: i. a pneumatic cylinder; ii. a press plate; iii. three brake disks; iv. three spring loaded pins; and v. three extension pins; wherein: f) the upper plate is attached to the lower plate with the at least one stand off pin such that there is a gap between the upper plate and the lower plate; g) the press plate is mounted in said gap; h) each one of the brake disks, each one of the spring loaded pins and each one of the extension pins are mounted in each one of the dual wheel swivel casters such that the brake disks will be pushed against the wheels when the press plate is pushed down; i) and wherein the pneumatic cylinder is adapted to push the press plate down when the pneumatic cylinder is pressurized thus locking the wheels.