Patent ID: 8505785
Filing Date: 2013-08-13
Classification: B05C,B65D,F15B,F16J

Abstract:
1. A cartridge piston comprising a tubular piston body with a longitudinal central axis, said piston body having a surrounding side wall and being closed at its front end by a piston end face, said side wall being provided with at least one flexible sealing lip, wherein said side wall further comprises a surrounding wall portion whose radiant as defined relative to the longitudinal central axis is provided with variations in a circumferential direction when in a relaxed state and not subject to external forces, wherein said cartridge piston is insertable into a cartridge and an unwound length of the outer contour of the surrounding wall portion is slightly oversized relative to an unwound length of an interior circle of the cartridge, whereby at the end of an applying process, a displacement of material will have led to an equalization along the circumference of the piston, whereby the piston will throughout its circumference be in biased abutment on a wall of the cartridge.