Helmet
A head protection helmet including an impact resistant shell that includes a cavity for accommodating a user's head. The helmet further includes an array of crushable bodies having a hollow closed configuration, e.g. flutes in corrugated material 14, 16 , the crushable bodies each having an axis that extends outwardly from the cavity to absorb impact forces exerted along the direction of the axis.
1. A head protection helmet
comprising an impact resistant shell comprising:
a cavity for accommodating a user's head, the cavity having a front and a back; and
an array of shock absorbing cells, each shock absorbing cell having four sides and an axis that extends outwardly from the cavity to permit the array of shock absorbing cells to absorb impact forces exerted along the direction of the axis;
wherein the array of shock absorbing cells is formed by a plurality of intersecting arc-shaped ribs overlying the cavity, wherein each rib of the plurality of ribs extends outwards from the cavity, and each rib includes an array of hollow cells, and wherein each hollow cell has a longest length that extends in a longitudinal direction of the hollow cell, the longitudinal direction being orthogonal to the arc defined by the hollow cell's respective arc-shaped rib.
2. A helmet as claimed in claim 1 , wherein each rib of the plurality of ribs is formed of crushable sheet material including a plurality of sheets of crushable board, the plurality of sheets of crushable board including
a first sheet extending outwards from the cavity and defining a plane of the rib and
a second sheet extending outwards from the cavity, the second sheet being adjacent to the first sheet; and
wherein each rib of the plurality of ribs also includes a first section connecting the first sheet to the second sheet;
wherein the first sheet, the second sheet and the first section form the array of hollow cells.
3. A helmet as claimed in claim 2 , wherein the ribs each include multiple layers of the hollow cells, the plurality of sheets of crushable board of each rib including a third sheet extending outwards from the cavity, the third sheet being adjacent to the second sheet opposite from the first sheet, and each rib of the plurality of ribs includes a second section connecting the second sheet to the third sheet forming an array of crushable bodies.
4. A helmet as claimed in claim 2 , wherein the hollow cells have an axis that lies orthogonal to the plane of the ribs.
5. A helmet as claimed in claim 2 , wherein the plurality of ribs comprises a first set of ribs extending axially between the front and the back of the cavity a second set of and ribs extending laterally between two opposed sides of the cavity, the first set of ribs and the second set of ribs intersecting one another at crossed halved joints.
6. A helmet as claimed in claim 1 , wherein each rib of the plurality of ribs is formed of crushable sheet material having at least one layer of the hollow cells.