Ground water sampling device

摘要

A ground water sampling device has an elongated cylindrical hollow housing positioned at a desired depth below the ground surface. The housing has an opening formed at its lower end and an inner surface with an annular groove disposed adjacent the opening. The device has an elongated screen capable of being telescopically received in the housing and capable of being deployed through the opening of the housing. The screen has an annular slot formed on its outer surface adjacent its upper end. A resilient locking collar is compressed inwardly and received in the slot of the screen when the screen is received in the housing prior to its deployment. The collar expands outwardly into the groove of the housing when the slot of screen is longitudinally aligned with the groove during deployment of the screen. The collar in its expanded position is disposed in both the slot and the groove so that the screen is locked in its deployed position.