Machine tool lubricating device

Claim 1

A lubricating device for machine cutting tools comprising: passage means including a double pipe nozzle for feeding compressed air and cutting fluid under pressure to a cutting tool; a pilot valve including air inlet means and air outlet means with first valve means interposed therebetween to control air flow through said pilot valve, fluid inlet means and fluid outlet means with second valve means interposed therebetween to control the fluid flow through said pilot valve, and a diaphragm arranged to control operation of said first and second valve means in response to fluid pressure applied to said diaphragm; a mixing valve including a compressed air passage and a cutting fluid passage for mixing said air and said fluid, said pilot valve and said mixing valve each being operatively connected in said passage means to coNtrol fluid flow therethrough with said mixing valve receiving the flow of air and the flow of fluid from said pilot valve; mechanical valve means for applying a pilot pressure to said diaphragm means to control operation of said pilot valve; and a transparent gauge window and a gauge tube located within said transparent window, said tube and said window being provided at the cutting fluid passage of said mixing valve to enable detection of the level of cutting fluid in said device.