Reciprocating plunger fuel injection pump

Claim 1

A reciprocating plunger fuel injection pump comprising a body defining a bore in which a plunger is mounted, a tappet assembly including a roller, a rotary cam mounted on a rotary cam shaft, a plurality of equiangularly shaped cam lobes on said cam, said roller co-operating with the cam to impart movement to the tappet assembly and plunger in one direction to cause fuel to be displaced from said bore, a lever assembly pivotally mounted in the body, said lever assembly comprising first and second levers, the first lever being of bellcrank form having a forked end of one arm for engagement with a head on the plunger and the end of the other arm engaging the second lever, one side of the head being engaged by the tappet assembly and the other side of the head being engaged by the forked end, said second lever adjacent its point of contact with the first lever mounting a roller engaging with the cam, the arrangement being such that following movement in said one direction by a cam lobe, the plunger and tappet assembly upon continued rotation of the cam are moved in the other direction by one of said lobes.