Patent ID: 8919616

Claim:
A piston including a piston body having a longitudinal axis, a conveying side transverse to said axis, a drive side transverse to said axis and opposite said conveying side and a circumferential piston jacket connecting said conveying side and said drive side, said piston jacket merging into a projection on the conveying side thereof and having an annular guide element for guidance of the piston in a cartridge and for forming a seal against a wall of the cartridge, said guide element being disposed in a plane transverse to said axis and spaced a first distance from said conveying side, an annular scraper element extending from said piston jacket and having a surface in a plane transverse to said axis and spaced a second distance from said conveying side smaller than said first distance, said scraper element having an edge at an outer periphery relative to said axis and wherein said guide element has a radial spacing from said axis larger than the radial spacing of said edge of said scraper element from said axis.