GB633083A - Improvements in automatic lubricators - Google Patents

Abstract

633,083. Lubricators. NUNN, H. L. Nov. 20, 1946, No. 34354. [Class 12 (iii)] [Also in Group XXVIII] A variable-stroke automatic lubricating pump comprises a pump actuating lever pivotally mounted in an oil reservoir, means for oscillating the lever, a hollow variable-stroke piston provided with a valve seat at its outer end (in the reservoir) and mounted in a pump cylinder communicating with the reservoir, and a valve mounted on the pump lever which is pressed on to the valve seat to close the cylinder and move the piston on its pumping stroke, said valve being supported entirely by the pump lever when it is retracted from its seating. As shown, a cylinder 2 screwed into a wall of a lubricant reservoir 1 contains a hollow piston 5 which projects at one end into the reservoir 1 and at the other end is fixed on to one end of a spring 11. The other end of the spring 11 is fixed to a gland nut 6 closing the outer end of the cylinder 2, and a rod 7 passing through the gland nut screws into one end of a strip-like member 10, which may be a flattened sheetmetal tube. The other end of the strip-like member is of increased width to form an abutment for the piston end of the spring 11, an upturned portion of which secures the strip-like member against rotation. To adjust the axial position of the piston 5, the rod 7 is rotated by a knurled head 8, a coned collar 9 bearing against the inner end of the gland nut 6 preventing any axial movement of the rod. An actuating lever 4 in the reservoir 1 is adjustably pivoted at one end and has a ball 12 riding in an elongated recess at the other end. The ball 12 seals the end of the piston 5 on the delivery stroke, the lever being operated by a cam 14 mounted on a rotating shaft 15. A member 16 engages the rear side of the cam to move the lever on the return stroke. A conical valvemember slidably-mounted on the actuating- lever 4 and engaging with a conical seating in the end of the piston 5 may be used in lieu of the ball 12. The lubricant may be delivered via a water-filled sight-feed casing 3, or, if grease is used, a spring-urged indicating plunger may be fitted direct in the delivery pipe. A steel liner (not shown) may be fitted in the cylinder 2 to receive the piston 5. The receiver 1 may have a gland hole at each side to allow a number of lubricating pumps to be ganged on a rod, the rod having gland washers at each end and the intermediate holes being sealed with packing. The actuating lever 4 may be operated by an oscillating shaft or a reciprocating member.