Patent ID: 6095775
Filing Date: 2000-08-01
Classification: F04B,F16N

Abstract:
A single-acting manual pump for feeding lubricant to metering units provided in a lubrication line, of the type comprising a piston (1) movable within a chamber (2) against the action of elastic means (3), and unidirectional valve means (4) provided in correspondence with at least one entry aperture (5) and at least one exit aperture (6) formed in a portion (2A) of said chamber (2), said unidirectional valve means (4) being arranged to enable a predefined quantity of lubricant to enter said portion (2A) of the chamber (2) from a reservoir (7) when the piston is raised, and to enable said quantity of lubricant to leave towards a tubular delivery channel (8A, B, C) when the piston (1) is released to return to its rest position by the action of said elastic means, wherein the valve means (4) comprises, at least in correspondence with the entry apertures (5) and exit apertures (6) of said portion (2A) of the chamber (2), valve elements (4A, B) which are at least partially deformable by the effect of pressure variation generated within said portion (2A) of the chamber (2) by movement of said piston (1) and wherein said at least one entry aperture (5) is provided in a wall of a plug (14) which is removably connected in correspondence with the slide chamber (2).