Abstract: A dump bailer actuator mechanism is disposed in a dump bailer having an elongated body and a longitudinal bore therethrough. The actuator mechanism has a collet rod which is moved longitudinally between a first, lower position and a second, upper position, by an electric motor turning a threaded shaft, on which rides a nut assembly connected to a push rod, which in turn contacts the collet rod. In the first, lower position, the collet rod keeps the collet fingers of a collet finger assembly, which have external shoulders, engaged with a shoulder profile within the bore of the main body. A weight bar assembly is attached to the collet finger assembly. When the collet rod is moved to the second, upper position, the collet fingers disengage from the profile, and the weight bar assembly is moved forcefully downward, striking a swab piston and forcing cement out of the dump bailer.

Abstract: A dump bailer actuator mechanism is disposed in a dump bailer having an elongated body and a longitudinal bore therethrough. The actuator mechanism has a collet rod which is moved longitudinally between a first, lower position and a second, upper position, by an electric motor turning a threaded shaft, on which rides a nut assembly connected to a push rod, which in turn contacts the collet rod. In the first, lower position, the collet rod keeps the collet fingers of a collet finger assembly, which have external shoulders, engaged with a shoulder profile within the bore of the main body. A weight bar assembly is attached to the collet finger assembly. When the collet rod is moved to the second, upper position, the collet fingers disengage from the profile, and the weight bar assembly is moved forcefully downward, striking a swab piston and forcing cement out of the dump bailer.