Patent ID: 6095377
Filing Date: 2000-08-01
Classification: B05B

Abstract:
A manually actuated dispensing pump, comprising a pump housing for mounting with a closure cap at an upper end of a container for fluent product,the housing comprising 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, said cylinder having in its lower area at least one vent port positioned outwardly of said chamber,said piston having a vent seal for closing communication between the open end of said cylinder and the vent port, said piston forming a sub-assembly with said housing upon insertion into said cylinder through said open outer end thereof, the improvement wherein said cylinder has on its inner surface means adjacent said vent port for spacing said piston seal from an inner edge of said vent port permitting the piston seal to by-pass said vent port to avoid any damage of said piston seal upon assembly into said cylinder.