Apparatus for controlling lubrication of compressed air tools

Apparatus for controlling lubrication of a compressed air tool by controlled continuous introduction of lubricating liquid into the supply of compressed air for said tool, said apparatus comprising:

• a supply container for said lubricating liquid;
• an air flow pipe extending through said supply container and adapted for connection at a first location with a supply of compressed air and at a second location with said tool;
• flow throttling means disposed in said air flow pipe, with that portion of said pipe between said first location and said throttling means constituting the upstream side of said pipe and that portion of said pipe between said throttling means and said second location constituting the downstream side of said pipe;
• a control device attached to said supply container;
• a liquid supply tube disposed in said supply container and extending between said control device and the lubricating liquid in said supply container;
• an upstream flow line disposed in saiid supply container and connected between the upstream side of said flow pipe and said control device;
• said control device having flow channel means therein connecting said upstream flow line with an outlet opening communicating with said supply container whereby a portion of the compressed air passing through said air flow pipe flows through said upstream flow line, said flow channel means and said outlet opening to apply pressure to the surface of the lubricating liquid in said supply container;
• said control device further including adjustable air flow control valve means for controlling said pressure applied to the surface of the lubricating liquid;
• a downstream flow line disposed in said supply container and connected between the downstream side of said flow pipe and said control device;
• said control device having flow duct means therein connecting said downstream flow line with said liquid supply tube;
• said control device further including adjustable liquid flow control valve means through which said flow duct means pass, with said liquid flow control valve means controlling the amount of liquid which can pass from said liquid supply tube to said downstream flow line;
• said pressure applied to the surface of said lubricating liquid causing a portion of said liquid to flow through said liquid supply tube, past said liquid flow control valve means, through said downstream flow line and into the downstream side of said air flow pipe where it is introduced into the compressed air flowing therethrough and is hence conveyed to said second location.