Patent ID: 6123233
Filing Date: 2000-09-26
Classification: B65D,F15B

Abstract:
A discharge arrangement for discharging bulk material from a receptacle, comprising:wall means forming a housing of said receptacle, said housing having a discharge opening;closure means movable from an open position into a closed position for closing said discharge opening;actuator means connected to said closure means for moving said closure means into one of said open and closed positions, said actuator means including:a cylinder extending along a longitudinal axis and having a first predetermined inner surface diameter defining a cavity, a first front end, and an opposing second front end;a piston movable relative to said cylinder along said longitudinal axis and having a second predetermined outer surface diameter smaller than said first diameter to leave a gap between the inner surface of said cylinder and the outer surface of said piston, said piston further having a first front side and an opposing second front side;a rolling membrane member between said inner surface of said cylinder and said outer surface of said piston to seal said gap and provide rolling friction when said piston moves within said cylinder;fluid supply means connected to said cavity for moving said piston;connecting means for interconnecting said first front side of said piston and said closure means; andlinear guide means between said cylinder and said piston for guiding movement of said piston, said linear guide means being attached to said piston at its second front side.