A locking device for a vehicle seat, in particular a locking device in an adjuster of a motor vehicle seat, has at least two locking elements which can be moved relative to each other and can be brought into engagement where they are secured by at least one securing element which is mounted in a manner such that the securing device can pivot about a rotational axis. Preferably, the pump also includes a nozzle contoured to direct a coolant from the first cavity toward the second cavity and onto the impeller assembly, and wherein the nozzle has an intake side communicating with the first cavity and a discharge side communicating with the second cavity. A first source of uniform light is fixed relative to the housing.