Method of dispensing material from a bag using a segmented piston

A method of dispensing material from a material dispensing gun comprising;

• loading a sausage bag comprising dispensing material into a tube removably attached to a dispensing gun, the tube having an exit end from which the dispensing material is dispensed during operation;
• locating said sausage bag between the exit end and a single piece piston in said tube, said single piece piston comprising a substantially square-shaped receptacle and first and second ends, the first end having a dome profile with an annular taper extending outwardly toward said second end and a circular seal lip integral with and extending from said annular taper about the perimeter of the piston, the circular seal lip comprising a plurality of substantially equal segments located about the perimeter of the seal lip, the annular taper comprising first and second tapered annular surfaces with the second tapered annular surface extending from the circular seal lip;
• engaging the sausage bag with the domed first end of the single piece piston located in said tube;
• advancing said single piece piston against said sausage bag with a rack fixedly attached to said single piece piston such that material located in said sausage bag engaged by said domed first end is dispensed from the exit end of said tube and unadvanced material not engaged by said domed first end extends over said first and second tapered annular surfaces;
• engaging the unadvanced material in said sausage bag with the circular seal lip;
• and
• advancing the unadvanced material with the plurality of substantially equal segments of said single piece piston such that the unadvanced material located in the sausage bag engaged by the plurality of segments is dispensed from the exit end of said tube;
• wherein the material dispensing gun includes a material dispensing housing comprising:
• a transparent tube for supporting bag-type dispensing material, the transparent tube being formed from a polymeric material allowing for the visualization of the movement of dispensing material located within the housing during operation;
• and
• a low friction base coating provided on the transparent tube for facilitating sliding movement between the transparent tube and the single piece piston engaging the tube and the bag-type dispensing material during operation.

A method of dispensing material from a material dispensing gun comprising;

• loading a sausage bag comprising dispensing material into a tube removably attached to a dispensing gun, the tube having an exit end from which the dispensing material is dispensed during operation;
• locating said sausage bag between the exit end and a single piece piston in said tube, said single piece piston comprising a substantially square-shaped receptacle and first and second ends, the first end having a dome profile with an annular taper extending outwardly toward said second end and a circular seal lip integral with and extending from said annular taper about the perimeter of the piston, the domed first end including a diameter greater than a diameter of the second end, the circular seal lip comprising a plurality of substantially equal segments located about the perimeter of the seal lip and a plurality of vent spacings forming the plurality of segmented sections allowing for independent movement of the segmented sections during operation, the annular taper comprising first and second tapered annular surfaces extending outwardly toward said second end with the second tapered annular surface extending from the circular seal lip;
• engaging the sausage bag with the domed first end of the single piece piston located in said tube;
• advancing said single piece piston against said sausage bag with a rack fixedly attached to said single piece piston such that material located in said sausage bag engaged by said domed first end is dispensed from the exit end of said tube and unadvanced material not engaged by said domed first end extends over said first and second tapered annular surfaces;
• engaging the unadvanced material in said sausage bag with the circular seal lip subsequent to said annular dome profile engaging the sausage bag during operation;
• and
• advancing the unadvanced material with the plurality of substantially equal segments of said single piece piston such that the unadvanced material located in the sausage bag engaged by the plurality of segments is dispensed from the exit end of said tube.

A method of dispensing material from a material dispensing gun comprising;

• loading a sausage bag comprising dispensing material into a tube removably attached to a dispensing gun, the tube having an exit end from which the dispensing material is dispensed during operation;
• locating said sausage bag between the exit end and a single piece piston in said tube, said single piece piston comprising a substantially square-shaped receptacle and first and second ends, the first end having a dome profile with an annular taper extending outwardly toward said second end and a circular seal lip integral with and extending from said annular taper about the perimeter of the piston, the circular seal lip comprising a plurality of substantially equal segments located about the perimeter of the seal lip, the annular taper comprising first and second tapered annular surfaces with the second tapered annular surface extending from the circular seal lip;
• providing at least one vent spacing disposed between the plurality of segments on the single piece piston, the at least one vent spacing being configured to move independently between each segment during operation;
• engaging the sausage bag with the domed first end of the single piece piston located in said tube;
• advancing said single piece piston against said sausage bag with a rack fixedly attached to said single piece piston such that material located in said sausage bag engaged by said domed first end is dispensed from the exit end of said tube and unadvanced material not engaged by said domed first end extends over said first and second tapered annular surfaces;
• engaging the unadvanced material in said sausage bag with the circular seal lip;
• and
• advancing the unadvanced material with the plurality of substantially equal segments of said single piece piston such that the unadvanced material located in the sausage bag engaged by the plurality of segments is dispensed from the exit end of said tube.

A method of dispensing material from a material dispensing gun comprising;

• loading a sausage bag comprising dispensing material into a tube removably attached to a dispensing gun, the tube having an exit end from which the dispensing material is dispensed during operation;
• locating said sausage bag between the exit end and a single piece piston in said tube, said single piece piston comprising a substantially square-shaped receptacle and first and second ends, the first end having a dome profile with an annular taper extending outwardly toward said second end and a circular seal lip integral with and extending from said annular taper about the perimeter of the piston, the circular seal lip comprising a plurality of substantially equal segments located about the perimeter of the seal lip, the annular taper comprising first and second tapered annular surfaces with the second tapered annular surface extending from the circular seal lip;
• engaging the sausage bag with the domed first end of the single piece piston located in said tube;
• advancing said single piece piston against said sausage bag with a rack fixedly attached to said single piece piston such that material located in said sausage bag engaged by said domed first end is dispensed from the exit end of said tube and unadvanced material not engaged by said domed first end extends over said first and second tapered annular surfaces;
• engaging the unadvanced material in said sausage bag with the circular seal lip integral, each of said plurality of segments includes a front taper angle and edge angle of a rear edge for facilitating the dispensing of the unadvanced material, at least one vent spacing being disposed between the plurality of segments on the single piece piston, the at least one vent spacing being configured to move independently between each segment during operation;
• and
• advancing the unadvanced material with the plurality of substantially equal segments of said single piece piston such that the unadvanced material located in the sausage bag engaged by the plurality of segments is dispensed from the exit end of said tube.