Air line lubricator safety device

Claim 1

An air line lubricator safety device for automatically actuating an air actuatable member such as a tool cut-off valve or a signaling device located outside of the lubricator comprising a. a lubricator having a head which includes means for feeding pressurized air into the lubricator, said lubricator having an oil bowl containing oil and pressurized air and means for feeding the oil to a line leading to an air operated tool, b. a piston housing having a piston chamber mounted on the head of the lubricator, c. a piston slidable in said piston chamber, d. an air outlet tube communicating with said piston chamber and leading to an air actuatable member located outside of the lubricator, e. a float supported by the oil in the lubricator bowl to rise and fall with the level of said oil, f. means connecting the float to the piston to cause the piston to move to a position closing said air outlet tube when the oil supports the float above a predetermined level and to expose the opening in said air outlet tube when the oil supports the float below a predetermined level, and g. an air intake passageway in the piston housing communicating with the pressurized air in the lubricator bowl and with the piston chamber and delivering pressurized air to the piston chamber between the face of the piston and end of the piston chamber in communication with the air outlet tube, thereby permitting pressurized air to flow through the air outlet tube for actuating an actuable member located outside of the lubricator.