Fuel pump with lever wear shoe

Claim 1

IN A MECHANICAL PUMP FOR PUMPING A LIQUID, SAID PUMP INCLUDING A HOUSING HAVING A DIAPHRAGM FORMING A PUMPING CHAMBER WITH INLET AND OUTLET VALVES, MEANS FOR ACTUATING SAID DIAPHRAGM TO EFFECT A PUMPING ACTION ON SAID LIQUID IN SAID PUMPING CHAMBER, SAID ACTUATING MEANS INCLUDING A LEVER OPERABLY CONNECTED TO SAID HOUSING AND TO SAID DIAPHRAGM RESPECTIVELY AND HAVING A REMOTE END THEREOF EXTENDING FROM THE HOUSING TO ENGAGE A ROTATABLE DRIVE MEMBER FOR DISPLAYING AND LEVER ARM TO OSCILLATE THE DIAPHRAGM, THE IMPROVEMENT THEREIN OF; (1) A WEAR PLATE OPERABLY AND LOSSELY SUPPORTED ON SAID LEVER REMOTE END, AND BEING URGED TOWARD SAID ROTATABLE DRIVE MEMBER, (2) SAID LEVER BEING PROVIDED AT SAID REMOTE END WITH AN ARCUATE SURFACE FACING IN THE DIRECTION OF SAID ROTATABLE DRIVE MEMBER, (3) SAID WEAR PLATE HAVING A SUBSTANTIALLY FLAT SURFACE DISPOSED IN CONTACT WITH SAID ARCUATE SURFACE TO PERMIT A LIMITED DEGREE OF ROLLING MOVEMENT OF SAID PLATE ON SAID ARCUATE SURFACE THEREBY PERMITTING LINE CONTACT BETWEEN SAID PLATE AND SAID LEVER ARM WITH REGARDLESS OF MISALIGNMENT OF SAID LEVER ARM WITH SAID DRIVE MEMBER, AND FASTENING MEANS DISPOSED AT OPPOSED ENDS OF SAID PLATE TO LOOSELY GUIDE THE LATTER DURING SAID ROLLING MOVEMENT OF SAID PLATE ACROSS SAID ARCUATE SURFACE AND TO LIMIT THE LONGITUDINAL MOVEMENT OF SAID PLATE ALONG SAID ARCUATE SURFACE.