Cartridge for a dispenser of reactive chemicals

A cartridge assembly for use with a dispenser of reactive chemicals, comprising:

• a purging member;
• a mixing assembly which has a forward and a rearward end, said mixing assembly including a deformable member having a longitudinal passageway formed therein which defines a mixing chamber and the longitudinal passageway extending to form a forward outlet opening and a rearward opening in said deformable member, said mixing assembly including an exterior surface, and said mixing assembly including first and second chemical passageways which extend from the exterior surface, pass through said deformable member at a position between the forward and rearward openings in said deformable member, and open into the mixing chamber;
• said purging member being adapted for reciprocal travel within the mixing chamber and to positions forward and rearward of said first and second chemical passageways;
• scraping means for avoiding build up of the reactive chemicals on said purging member, said scraping means including first and second cup-shaped members with each of said cup-shaped members having a base portion, a side portion and a rim portion with the base, side and rim portions of each cup-shaped member defining a recess, and said cup-shaped members being positioned within said mixing assembly such that said rim portions are positioned adjacent one another, the base portions of said first and second cup-shaped members including an aperture in alignment with said longitudinal passageway, said scraping means further comprising a deformable insert which includes a first and a second end with said first end of said insert positioned within the recess of said first cup-shaped member and the second end of said deformable insert positioned within the recess of said second cup-shaped member, said insert including a through-hole which is aligned with said longitudinal passageway, and said purging member being dimensioned and arranged for reciprocal travel within said longitudinal passageway, said aligned through-hole of said deformable insert and the apertures formed in said cup-shaped members;
• the apertures in said cup-shaped members being sized so as to place said cup-shaped members in a scraping relationship with said purging member, and wherein said cup-shaped members have an external circumference essentially the same as that of said deformable member and the base of one of said cup-shaped members is in an abutting relationship with one end of said deformable insert.

A cartridge assembly for use with a dispenser of reactive chemicals, comprising:

• a purging member;
• a mixing assembly which has a forward and a rearward end, said mixing assembly including a deformable member having a longitudinal passageway formed therein which defines a mixing chamber and the longitudinal passageway extending to form a forward outlet opening and a rearward opening in said deformable member, said mixing assembly including an exterior surface, and said mixing assembly including first and second chemical passageways which extend from the exterior surface, pass through said deformable member at a position between the forward and rearward openings in said deformable member, and open into the mixing chamber;
• said purging member being adapted for reciprocal travel within the mixing chamber and to positions forward and rearward of said first and second chemical passageways;
• scraping means for avoiding build up of the reactive chemicals on said purging member, said scraping means including first and second cup-shaped members with each of said cup-shaped members having a base portion, a side portion and a rim portion with the base, side and rim portions of each cup-shaped member defining a recess, and said cup-shaped members being positioned within said mixing assembly such that said rim portions are positioned adjacent one another, the base portions of said first and second cup-shaped members including an aperture in alignment with said longitudinal passageway, said scraping means further comprising a deformable insert which includes a first and a second end with said first end of said insert positioned within the recess of said first cup-shaped member and the second end of said deformable insert positioned within the recess of said second cup-shaped member, said insert including a through-hole which is aligned with said longitudinal passageway, and said purging member being dimensioned and arranged for reciprocal travel within said longitudinal passageway, said aligned through-hole of said deformable insert and the apertures formed in said cup-shaped members;
• the apertures in said cup-shaped members being sized so as to place said cup-shaped members in a scraping relationship with said purging member, and wherein said mixing assembly includes an external shell housing having a forward dispensing end and a rear end, said mixing assembly further comprising a retaining ring member axially fixed with respect to said shell housing, said deformable member being positioned within and at the forward end of said shell housing, said scraping means being positioned to the rear of said deformable member and forward of said retaining ring, and said retaining ring being dimensioned and arranged to limit axial movement of said scraping means along the central axis of said longitudinal passageway.