Trigger sprayer

A dispenser pump to be mounted on a container for dispensing product from the container comprising:

• a valve housing to be mounted on the container outlet;
• means within said housing defining a variable volume pump chamber including a retainer plate attached to said housing closing said chamber;
• flat resilient gasket means clamped between said plate and said housing;
• means defining an inlet passage leading into said chamber and an outlet passage leading out of said chamber;
• a flexible flap depending from said gasket and extending into said inlet passage to form an inlet valve element normally closing said inlet passage, the walls of said inlet passage permitting the flap to flex in a direction to permit flow into said chamber from said container but preventing the flap to flex in a direction to permit flow out of the chamber;
• and
• a flexible flap depending from said gasket into said outlet passage forming an outlet valve element normally closing said outlet passage, the walls of said outlet passage permitting the outlet flap to flex in a direction to permit flow out of said chamber but to prevent flow into the chamber.

A dispenser pump comprising:

• a valve housing;
• a flexible bulb within a space in said housing defining a variable volume pump chamber together with a retainer plate attached to said housing and closing the chamber, said retainer plate including a horizontal flat central portion and a vertically extending circumferential wall which extends into said chamber so that the vertical wall and the flat wall form the upper portion of the side walls of the chamber and the flat portion forms the top wall of the chamber;
• means defining an inlet port to said chamber in said vertical wall and in the side wall of said bulb and means defining an outlet port from said chamber in said vertical wall and in said bulb side wall;
• means defining an inlet passage in said housing spaced outwardly from said vertical wall and in communication with said inlet port and with said container;
• means defining an outlet passage in said housing spaced outwardly from said vertical wall and in communication with said outlet port;
• and
• a flexible annular resilient flap clamped between said housing and said retainer plate and including valve means normally closing said inlet passage and normally closing said outlet passage, the walls of said inlet passage and said outlet passage being arranged with respect to said inlet and said outlet valve means such that the inlet valve will open said passage and the outlet valve will close said outlet passage when suction is created in said chamber and said inlet valve will close the inlet passage and said outlet valve will open the outlet passage when pressure is created within said chamber.

A dispenser pump comprising:

• a housing having wall means defining an internal cavity open on its upper end including a shoulder around the cavity spaced below the open upper end means in said shoulder forming an inlet passage connecting the cavity to a container holding the product to be dispensed, and means in said shoulder forming an outlet passage connecting said cavity and an outlet nozzle;
• means defining a variable volume pump chamber open to said cavity;
• a cover plate closing the open upper end of said cavity having means depending into said cavity and cooperating with said housing shoulder to separate said inlet passage from said outlet passage;
• and
• a flexible valve element captured between said cover and said housing shoulder having an inlet portion extending over and closing said inlet passage and an outlet portion extending over and closing said outlet passage, said inlet portion permitting flow into said chamber but preventing flow out of said chamber, and said outlet portion permitting flow out of said chamber and preventing flow into said chamber.