Dispenser for cyanoacrylate adhesives

Abstract

A constant diameter or segmented constant diameter passageway within a dispensing tip channels and dispenses a cyanoacrylate adhesive from a container through a discharge outlet at the extremity of the tip. A stopper for the tip includes a plunger for matingly and penetrably engaging the passageway to force reverse flow of the cyanoacrylate adhesive back into the container. The forced flow, due to the viscosity and surface tension characteristics of the cyanoacrylate adhesive, initiates complete drainage of the passageway and prevents any crusting and clogging of the cyanoacrylate within the passageway. The stopper is manufactured attached to the end of the tip at a weakened junction for breakaway separation by the ultimate user, which junction insures the establishment of a sharp edged discharge orifice at the tip to promote accurate dispensation of cyanoacrylate adhesive and to prevent clogging of the orifice. A two phase interlock secures a cap to the container and includes flanges extending from the cap for engaging lugs located about the mouth of the container which flanges are disengageably engageable with the lugs by rotating the cap relative to the container. A key extends from the cap into a key way in the container to prevent rotation of the cap relative to the container absent withdrawal of the key from the key way by deliberate precise flexing of the cap. The mating configuration of the tip and container promotes welding of these components to one another and effect a seal therebetween.