Lubrication pump

Claim 1

A manually and pneumatically operable lubrication pump assembly comprising means forming an open-bottomed lubricant reservoir, means forming a pump body of one-piece cast construction having an inner end affixed to the bottom end of said reservoir, an outer end spaced from said reservoir and a lubricant outlet formed therein, means forming a lubricant pumping cylinder in said pump body opening to said outer end thereof, means forming first and second axially spaced ports in said pumping cylinder, means forming a lubricant outlet passage in said pump body communicating said first port and said lubricant outlet, means forming a lubricant fill passage in said body communicating said second port and said reservoir, lubricant piston means including a pumping piston slidably carried in said pumping cylinder and extending beyond the outer end thereof, the inner end of said piston being movable from a first position outboard of said second port to a second position adjacent said first port for enabling lubricant to enter said pumping cylinder through said fill passage and for pumping same out said lubricant outlet, spring means interconnecting said pump body and said piston means for biasing said piston means toward said first position, a cylindrical threaded opening formed in said outer end of said pump body through which the outer end of said piston extends, adapter means for providing pneumatic pumping piston actuating means comprising an elongated tubular coupling having a cylindrical chamber therein, an externally threaded inner end communicating with said chamber for threading into said threaded opening of said pump body in surrounding relation to said pumping piston, an internally threaded outer end communicating with said chamber for connection to a source of pressurized air and an air-operated actuating piston disposed in said chamber for engaging the outer end of said pumping piston and for moving same toward said second position thereof against the bias of said spring means, said pumping piston extending through said inner end of said coupling and the outer end of said pumping piston residing within said chamber.