US Patent 7757968 Dispensing device

A trigger dispensing device for the concurrent dispensing of two or more fluids separately kept in a tank is disclosed. The dispensing device comprises a deformable elastic membrane whose pumping elements can be affected by a trigger for dispensing fluids. Membrane is held in position between a frame and a counter frame, whereas trigger is hinged to an arm of the counter frame. The device is provided with a delivery valve and with a check valve integrated in the membrane. The device is adapted for the concurrent dispensing of two or more fluids and is provided with a structure comprising a reduced number of components.