Patent ID: 8453887
Filing Date: 2013-06-04
Classification: A61C,B05C,B65D

Abstract:
1. A vented piston comprising a plunger having a front side and a rear side, a venting passage extending between the front side and the rear side, and a cap on the front side; wherein the cap is resiliently-biased towards an open position in which air can pass through the venting passage from the front to the rear side of the plunger, wherein the cap is movable from the open position to a closed position in which the cap closes the venting passage, wherein the cap is resiliently-biased towards the open position by a spring which is formed as a one-piece moulded component together with the cap and at least a part of the plunger, and wherein the spring comprises a plurality of parts, each of which extends between the cap and the front side of the plunger.