Patent ID: 8783418

Claim:
A lubricator comprising: i) a housing defining a main lubricant chamber adapted to contain a fluid lubricant, the housing having a lubricant outlet for discharging the lubricant from the lubricator; ii) a piston pump in fluid communication with the main lubricant chamber, the piston pump comprising: a) a pump chamber adapted to receive the lubricant from the main lubricant chamber; and, b) a pump piston adapted to be driven to discharge the lubricant from the pump chamber through the lubricant outlet in the housing; iii) a motor for driving the piston pump, the motor having a drive shaft in axial co-alignment with the pump piston and adapted to rotate a cam about an axis of rotation, wherein rotation of the cam about the axis of rotation causes a cam surface of the cam to ride on the pump piston along a path on a surface of the pump piston, the path having varying heights, relative to the pump piston, along the axis of rotation and the cam surface having varying heights, relative to the drive shaft, along the axis of rotation such that rotation of the cam about the axis of rotation causes the cam to drive reciprocating motion of the pump piston in the pump chamber; iv) a means for urging the fluid lubricant into the pump chamber; and, v) electronic controls for regulating the activation of the motor to control the discharge of the lubricant from the lubricator.