Abstract: A cylinder, such as the barrel of a caulking cartridge, interlocks with an internal member, such as the closure plunger for the caulker, by means of two to four cuts through the cylinder wall evenly spaced from the end of the cylinder to form catches from the segments of the wall between each of the cuts in the end of the cylinder. The catches are longer circumferentially of the wall than their width from the cut to the end of the cylinder, and they are deformed inward from the locus of the cylindrical wall toward a chord orientation. The member has a body fitting the inside of the cylinder and slidable past the catches, and the body is seated inside the cylinder so the catches are disposed between the body and the end of the cylinder to interlock with the body to prevent its movement out of the end of the cylinder.

Abstract: A cartridge such as a caulking cartridge is formed of extruded and injection molded resin parts assembled and welded together. A resin tube is extruded and cut off in lengths to form cartridge barrels, and single-piece resin end caps and nozzles are injection molded. The barrel cylinders are fed to an assembly station where the end caps and nozzles are fitted over one of the severed ends of the barrel cylinders in concentric registry with the barrel cylinders and are successively welded to the barrel cylinders to form cartridges.

Abstract: A cartridge plunger has a flexible forward wall with a forwardly extending central projection shaped to fit part way into the nozzle. The flexible forward wall is moved to a rearward position when the plunger engages the contents of the cartridge as it is inserted in the rear end of the cartridge. Although the forward-extending projection displaces some of the contents, the volume made available around the projection from the forward wall being in the rearward position is greater than the volume displaced by the projection. This allows a slight increase in the total volume of contents loadable into the cartridge, and when the plunger is forced against the front of the cartridge, the contents are not only forced out of the cartridge itself, but also from a portion of the nozzle occupied by the forward projection of the plunger.

Abstract: A cartridge plunger has a generally cup-shaped body molded of a relatively rigid resin material, and a seal material is joined to the body and molded of a substantially softer and more resilient resin material. The body has an annular wall closely spaced from the inner surface of the cartridge, and the seal material extends around the outside of the annular wall which presses the seal material tightly against the inner surface of the cartridge when the plunger is in the cartridge. The seal material can also extend rearwardly of the plunger body and around the rearward edge of the cartridge for an additional seal when the plunger is initially seated in the cartridge. The softness and conformability of the sealing material forms a better sealing engagement with the cartridge to protect the contents from moisture and air.

Abstract: A dispenser of the type using a threaded rod with a turning knob is applied to a disposable cartridge and plunger. The cartridge plunger has a threaded central sleeve that is sealed closed, and the threaded rod, knob, and an anchorage adapter are separate from the cartridge until dispensing is to begin. Then the rod is threaded through the sleeve to puncture the seal and advance through the material to bring the anchorage adapter adjacent the rear end of the cartridge. The anchorage adapter is then releasably secured to the rear end of the cartridge, and the rod turned in the opposite direction to advance the plunger for dispensing material. The plunger can be backed up to stop drool if dispensing is interrupted, and the rod, knob, and adapter can be removed and reused after dispensing is completed.

Abstract: A cartridge such as a caulking cartridge is formed of extruded and injection molded resin parts assembled and welded together. A resin tube is extruded and cut off in lengths to form cartridge barrels, and single-piece resin end caps and nozzles are injection molded. The barrel cylinders are fed to an assembly station where the end caps and nozzles are fitted over one of the severed ends of the barrel cylinders in concentric registry with the barrel cylinders and are successively welded to the barrel cylinders to form cartridges.