A chain stopper is connectable to a support structure, such as a platform, and comprises: a chain locking portion for automatically engaging a first chain link of a chain so as to prevent the chain from being pulled in a first direction and; an activation portion connected to the chain locking portion. The activation portion is configured such that, upon pulling the chain in a second direction, the activation portion is adapted to be engaged by the chain so as to disengage the chain locking portion from the first chain link, allowing the chain to be pulled in the second direction.