my wife visited a local bank and while exiting , she knocked against a chair ,tripped and fell on to other chairs falling flat. neck n wrists in.j

You don't say whether your wife has an injury. If she wasn't injured, there's no case. If she was injured, depending on the severity of the injury and the exact circumstances leading to her fall, you might have an action against the bank if you can prove there was some negligence on the bank's part that caused your wife's injury. The statute of limitations for filing a personal injury action is three years from the date of injury