Lubrication pump

Claim 1

In a lubricator device, the combination of a pump structure provided with a pump cylinder therein, having an open end, a plunger reciprocable therein and having a portion extending from said open end, means biasing said plunger in a direction toward said open end, said pump structure having means for supplying lubricant to the opposite end of said cylinder, and a discharge port communicating with such opposite end of the cylinder, and valve means for controlling lubricant flow to and from said cylinder, a cam shaft disposed in spaced relation to the free end of said plunger portion, with the axis of said shaft disposed normal to and intersecting the axis of said cylinder, a cam carried by said cam shaft, a cam follower arm pivotally supported for movement about an axis laterally spaced from and extending parallel to the axis of said cam shaft, said arm extending between said cam and said free end portion of the plunger and having an arcuate portion engaged with the latter, bearing members supporting said cam shaft at spaced intervals, each bearing member having a shaft-receiving notch therein which opens on the portion of the bearing member adjacent said arm, said notch having a semicylindrical bottom portion which is complemental to the external surface of said shaft, and a roller supported by said arm for rotation about an axis extending parallel to said shaft axis and engageable with said cam for actuation thereby, the axis of said roller and contacts between said cam and roller and between said arcuate surface and said free end portion of the plunger all lying approximately in a common plane containing the plunger axis, throughout rotation of said cam and reciprocation of said plunger.