| 摘要 |
<p>A pneumatically actuated lubricant pump wherein air is forced into the cylinder (18) through a passage (50) extending longitudinally through the piston rod (34). The rod is part of a piston assembly (30) reciprocably mounted within a pump housing (12). The air passage extends from a lateral rod entrance (52a,52b) through the rod and through the piston head (32). Air is forced into and released from the air cylinder through the passageway. Reciprocation of the piston rod draws lubricant into a pump chamber through a part (98) and delivers it through an outlet (130). In an alternative double-action embodiment, a second air flow passage (80) extends through the pump housing alone directly to the air cylinder permitting compressed air to be alternately supplied to the opposite sides of the piston head. <IMAGE></p> |
