Abstract: The rigidity of a panel of honeycomb material formed by parallel bands of thin metal spot-welded together and spread apart so as to form regular cavities, is broken by passing this panel in a gripped state between a plurality of cylinders 3, 4, 5 having a hard surface and whose axes are parallel and disposed in such manner as to produce in the panel as many changes in direction at roughly a right angle so as to fold or corrugate the walls of the cavities in a direction roughly parallel to the edges of the apices formed by the sides of the apices. A sandwich is formed by adhering at least one panel 6 treated in this way on a sheet 9 of a thermoplastic material, the sandwich is heated to a temperature for softening the thermoplastic material and the sandwich is placed on a form having the desired curvature and allowed to cool.

Abstract: In this helmet, the shield has a lower notch adapted to rest on the nose of the user and is connected by an elastically yieldable connection to a support which is pivotally mounted on the outer shell of the helmet. This connection biases the shield inwardly of the helmet. The shield in this way adapts itself to the morphology of the user.Application in ski crash-helmets.