Abstract: The glue dispenser comprises a collapsible tube having an externally threaded spout. A nozzle assembly comprises an internal nozzle threaded onto the spout and a external nozzle mounted on the internal nozzle. A nozzle valve registers with the opening of the external nozzle and is biased into closing engagement therewith by a deformable portion of the valve being urged against a cam surface. A piercing element is formed on the internal nozzle element, and when the nozzle is completely threaded down on the threads of the spout of the collapsible tube, the piercing element penetrates the sealing diaphragm of the spout so that the material in the collapsible tube can be squeezed through the spout and through the nozzle, with the nozzle valve controlling the flow of the material from the dispenser.

Abstract: A stacking element is formed to engage two vertically stacked articles to hold the articles in position and is provided with projections on its external periphery to engage the projections on adjacent elements. These elements will maintain the articles in a stack against vertical and lateral displacement, so the stack will remain assembled during storage and transport.

Abstract: A container and lid of molded plastic material having a fastener structure integral with the container and lid to connect the lid onto the container. The fastener comprises two complementary series of element, one projecting axially upwardly on the wall of the container, the other downwardly on the rim of the lid, interengage when the cover is pressed down. The elements having head portions wider than the base portions, so that when interengaged, they may not be separated without stressing or distorting the material.

Abstract: A tamper-proof multiple chamber package includes a can or container with a top or lid and a concave cap connected to the lid. A lid receiving ring is mounted on the upper edge of the container and includes a seam, a recessed platform, and a countersunk annular groove. The lid includes a downwardly extending annular protrusion for insertion into the groove with a friction fit and a rim positioned outwardly of the protrusion. The cap includes a downwardly extending annular flange with an inwardly protruding bead that is snapped about the rim of the lid, so that the cap and lid are connected together, the lid and cap are mounted on the can and the edge of the cap is confined inside the seam of the ring, where the cap cannot be pried loose from the can.