Abstract: A machine for making ice cream bars is provided with a receptacle for holding a refrigerant, preferably an ice and brine bath, a lower lid movably mountable over the receptacle, and an upper lid mountable over the lower lid, the lower and upper lids rotatable together about a vertical axis. The machine further includes four containers for receiving and holding an ice cream bar mix, the containers configured to be coupled to the upper lid and the lower lid with a portion of the container immerged in the bath. A user can turn a handle on the receptacle to rotate the lids, and thus the containers relative to the bath in order to promote freezing of the ice cream mix into an ice cream bar.

Abstract: A process of forming an interference fit between a rivet and the perimeter of an aperture through which the rivet shank is inserted finds particular application in the aircraft industry where sheets of component materials are joined together as a sheet assembly by a plurality of rivets. The process utilizes a high energy impact gun which forms a button on one end of a rivet shank, the other end of the rivet shank protruding a predetermined distance from a sheet surface and prevented from longitudinal movement by a bucking bar. The impact gun is then activated against the other end to rapidly form a second button. The rivet shank is radially expanded during the riveting process to thereby swell against the perimeter of the rivet hole for compression stressing which serves to stress relieve the area adjacent to the hole during cyclic loading of a sheet assembly.