Dispenser for pasty compositions

In a dispenser for pasty compositions having a housing containing a piston which is displaceable in use only in an emptying direction, and a head piece, the latter being compressible in an actuating condition as a bellows in a direction towards the piston, said head piece having a dispenser outlet opening from which an inwardly directed tube extends, the tube having an inner mouth-end extending freely into the pasty compositions in every position of the bellows, the improvement comprising

• a cover of the housing,
• a hard-walled peripheral mounting collar to which the bellows is mounted, said mounting collar extends upwardly from said cover, said collar with said cover forming a pot-like chamber,
• the inner mouth-end of the tube extends within the mounting collar, the inner mouth-end extending into the pot-like chamber, and
• the dispenser further having only one valve, said one valve comprising a flap valve centrally disposed in said cover below the inner mouth-end of the tube in a basic rest condition of the dispenser, said flap valve having a passage opening and a hinge, the inner mouth-end of the tube points substantially centrally to said flap valve when said bellows is not pressed, said flap valve and said cover defining a substantially flat bottom of said pot-like chamber so that the latter is a free unimpeded chamber filled with the pasty compositions into which the inner mouth-end of the tube extends,
• said piston forms at its top a flat-surface wall which extends parallel to the housing cover,
• said flap valve is disposed on said cover such that when pressing said bellows in said actuating condition said passage opening is closed, and
• said inner mouth-end of said tube is spaced above said flap valve by a distance substantially equal to an inner diameter of said tube, said flap valve having a length from said hinge substantially greater than said distance so as to enable abutment of said flap valve against the inner mouth-end of the tube when said bellows is released of pressing,
• said inner mouth-end of said tube swinging away from said flap valve such that the axis of said inner mouth-end of said tube is displaced substantially from intersection with said flap valve upon pressing said bellows in said actuating condition, said abutment of the inner mouth-end of said tube and said flap valve for assisting closure of said passage opening upon a pressing of said bellows and, said abutment impeding a back flow of pasty compositions in said tube upon a release of pressure on said bellows.

In a dispenser for pasty compositions having a housing containing a piston which is displaceable in use only in an emptying direction, and a head piece, the latter being compressible by pressing in an actuating condition piece having a dispenser outlet opening from which an inwardly directed tube extends, the tube having an inner mouth-end extending freely into the pasty compositions in every position of the bellows, the improvement comprising

• a cover of the housing,
• a hard-walled peripheral mounting collar to which the bellows is mounted, said mounting collar extends upwardly from said cover, said collar with said cover forming a pot-like chamber,
• the inner mouth-end of the tube extends within an upper edge of the mounting collar, the inner mouth-end extending into the pot-like chamber,
• the dispenser further having only one valve, said one valve comprising a flap valve centrally disposed in said cover, said flap valve having a passage opening, an axis of the tube intersects the passage opening when said bellows is not pressed, said flap valve and said cover defining a bottom of said pot-like chamber so that the latter is a free unimpeded chamber filled with the pasty compositions into which the inner mouth-end of the tube extends,
• said piston forms at its top a flat-surface wall which extends parallel to the housing cover,
• said flap valve is disposed on said cover such that when pressing said bellows said passage opening is closed,
• said flap valve and cover in closed position of said passage opening being below the upper edge of said mounting collar defining said bottom as substantially flat, and
• said inner mouth-end of said tube is spaced above said flap valve by a distance substantially equal to an inner diameter of said tube, said flap valve having a length from said hinge substantially greater than said distance so as to enable abutment of said flap valve against said inner mouth-end of said tube when said bellows is released from said actuating condition,
• said inner mouth-end of said tube swinging away from said flap valve such that the axis of said inner mouth-end of said tube is displaced substantially from intersection with said flap valve upon pressing said bellows in said actuating condition, said abutment of the inner mouth-end of said tube and said flap valve for assisting closure of said passage opening upon a pressing of said bellows, said abutment impeding a back flow of pasty compositions in said tube upon a release of pressure on said bellows.