Patent ID: 7213273
Filing Date: 2007-05-08
Classification: E03C

Abstract:
1. An improvement on a plunger, comprising a supporting member; a lever positioned under, and pivoted to the supporting member; a pipe passed through, and joined to the supporting member at an upper end thereof; a connecting rod; the connecting rod being passed through an axial hole of the pipe with a lower end thereof projecting out from a lower end of the pipe; the connecting rod being connected to the lever such that it will be upwards displaced relative to the pipe when the lever is pivoted upwards; the connecting rod having a coupling head joined to an upper end thereof for connection with an air pump; the connecting rod having a passage therein, which communicates with inside of the coupling head, and which has an outlet portion; the connecting rod having a cone-shaped lower end; the connecting rod having a stopping ring secured around a portion thereof that is between the outlet portion of the passage and the cone-shaped lower end; a covering member having a holding room; the covering member having a neck portion on an upper side thereof, and an air outlet hole on a lower side; the neck portion having an axial hole in communication with the holding room; the covering member being securely joined to the lower end of the pipe at the neck portion thereof with the connecting rod being passed through the axial hole of the neck portion; two airtight rings secured on an inner side of the neck portion of the covering member; and a spring positioned between the neck portion of the covering member and the stopping ring secured on the connecting rod for biasing the connecting rod downwards; the connecting rod being going to be biased to a lowermost position by means of the spring when the lever isn't used; the cone-shaped tail end being going to block the air outlet hole of the covering member when the connecting rod is biased to the lowermost position; the outlet portion of the passage being going to be under both of the airtight rings, allowing air to travel into the holding room from the passage, when the connecting rod is biased to the lowermost position; the outlet portion of the passage being going to be between both of the airtight rings when the connecting rod is displaced upwards away from the lowermost position by means of pivoting the lever upwards; air being going to be stopped from traveling into the covering member from the passage when the outlet portion of the passage is between both of the airtight rings.