Buckhorn, Inc.

Triangle Tool Corporation

Roy B Luther

Daniel R Miller

An attached lid container has lids that are hinged to the top edges of the side walls of the container. When the lids are closed, the free edges of the lids engage one another to form a joint that interlocks the lids together. The lids are attached to the container at the hinge joints after the molding of the container and lids, while the molded parts are still in the mold press. Specifically, the lids are molded next to the container and then moved laterally to be aligned with the hinge line of the container after the mold cavity is withdrawn. Then, the ejectors push the lids out toward the container. The force of the outward movement causes the hinge parts of the lids and container to snap together. Subsequently a robot arm removes the container from the mold press with the hinged lids assembled on the container.

Method of molding and assembling a container with hinged lids

A container having a bottom and two pairs of opposed walls connected together to form a container body having an open top covered by a pair of hinged lids. The upper edges of one pair of opposed walls have a plurality of pin segments formed thereon along a hinge line and an edge of each of the lids has a plurality of generally U-shaped knuckles formed thereon along the hinge line with each knuckle having opposed sidewalls forming a slot having an opening at one end and a bearing portion at an opposite end which opens upwardly with respect to a top surface of the lid. The opposed sidewalls of the slot of each knuckle have ribs protruding inwardly to retain a corresponding pin segment of the container body. When the lids are connected to the container body and rotated to a closed position, the slots of each knuckle face upwardly in a direction away from the top surface of the lid.

Growing community of inventors

Brookfield, WI, United States of America

Roy B Luther