A DISPENSING DEVICE

摘要

A dispensing device (50) for dispensing fluent material, e.g. a lubricant, over a prolonged period of time comprising a cylinder (2), a piston (6) and/or extendable membrane separating the cylinder into a fluent material containing first chamber (69) and a second electrolyte containing chamber (9), a sacrificial first electrode (61), a gas-releasing second electrode (63) connected to the first electrode, the electrodes not being in contact with the electrolyte prior to activation of the device, and means for adjusting the surface area of the second electrode which will be exposed for contact with the electrolyte on activation of the device. A method of lubricating a machine bearing is also disclosed.