Importance

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Abstract

The invention relates to a progressive distributor for lubricants, comprising at least two distributor sections each including a double piston guided in a cylinder chamber for reciprocating therein between two end positions, a supply passage, and a number of passages interconnecting adjacent cylinder chambers as well as the first cylinder chamber and the last cylinder chamber in a common plane and leading to discharge outlets, the two end sections of each cylinder chamber acting alternately as a pressure chamber for pressurizing the respective piston and as a metering chamber for metering the lubricant. In known progressive distributors having cylinder chambers disposed in a common plane, the presence of entrapped air particularly in the long passages interconnecting the first and last cylinder chambers frequently prevents the lubricant from being properly discharged. In accordance with the invention this disadvantage is eliminated by the provision that of said number of passages at least the ones interconnecting the first cylinder chamber and the last cylinder chamber in the common plane is formed over part of its length by two juxtaposed branch passages provided with closure elements therein arranged to close in opposite directions of flow, the closure elements being disposed closely adjacent to or in the metering chamber formed by the respective end section of the cylinder chamber.

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First Claim