Liquid distributing pump

Application Number: 00102703
Application Date: 2000.02.17
Publication Number: 1268472
Publication Date: 2000.10.04
Priority Information: 1999/3/26 US 09/276926
International: B05B9/01;B05B11/00;B65D47/34;F04B9/14
Applicant(s) Name: Calmar Inc.
Inventor(s) Name: Steve. L. Swetton;Josef K. Dodd
Patent Agency Code: 72002
Patent Agent: liu xinpeng
Abstract A manually actuated dispensing pump has a pump housing for mounting with a closure cap at an upper end of a container for fluent product, the housing having a pump cylinder open at its outer end to atmosphere and providing at its inner end area a pump chamber for a manually reciprocable piston having a resilient piston seal, the cylinder having in its lower area at least one vent port positioned outwardly of the chamber, the piston having a vent seal for closing communication between the open end of the cylinder and the vent port, the piston forming a sub-assembly with the housing upon insertion into the cylinder through the open outer end thereof, and one or more ramps or tapered ribs being provided adjacent the vent port for spacing the piston seal from an inner edge of the vent port permitting the piston seal to by-pass the vent port to avoid any damage of the piston seal upon assembly into the cylinder.