Device for locating the position of the control rack of a pump and for locking the latter in disassembling position

Claim 1

Variable displacement pump, for use as a fuel injection pump for an internal combustion engine or the like of the type provided with a constant delivery-stroke piston, the angular position of which inside a casing for the pump determines a particular amount of fluid delivered in each cycle, comprising a toothed rack having a toothed portion, a pinion cooperating with said toothed portion through which said piston is adapted to slide axially, said piston being movable in translation jointly with pump actuating means and to rotate jointly with said pinion for varying said angular position and therefore said particular amount; said pump also including means for displaying said particular amount, comprising an auxiliary shaft pinion adapted to rotate about its own longitudinal center-line disposed in meshing relationship with said rack and supporting an indicating needle supported by said last-named pinion, a graduated sector over which said needle is movable; said pump being also of the type wherein at a given angular position of said piston the latter may be removed from the pump casing and whereby one end of said auxiliary shaft pinion is accessible, said end comprising driving square means for enabling said rack to be displaced manually through the medium of said auxiliary shaft pinion.