Jean-Pierre Giraud,Bernard Sol,Robert J. Pangborn,Robert S. Abrams,Joseph W. Rogers,Peter J. Sagona,Mchael J. Mims
申请号：
US15027144
公开号：
US20160243308A1
申请日:
2014.10.14
申请国别(地区):
US
年份:
2016
代理人:
摘要：
A convertible plunger is provided comprising an internal portion and a generally cylindrical exterior surface. At least a portion of the exterior surface is maintained in an initial expanded state by a property of the internal portion. The expanded state is reducible to a constricted state by an operation that is applied to the internal portion of the plunger to alter the property. A film coating may also be applied to a sidewall of the sleeve to reduce a sliding friction between the sleeve and barrel. A film coating may also be applied to a nose cone of the plunger to provide a barrier between the plunger and product in the barrel.
