Personal impact protection device
A personal impact protection device ( 10 ) with a first mechanical member ( 12 ) that may be a shell, ring or housing, and a second mechanical member ( 14 ) that may also be a shell, ring or housing. The two mechanical members ( 12, 14 ) are nested and spaced from one another. One or more elastomeric energy-absorption members ( 16 ) are mechanically coupled to and span the distance between both of the mechanical members ( 12, 14 ) to absorb energy from impacts to the outer mechanical member ( 12 ) that displace the outer member ( 12 ) relative to the inner member ( 14 ).
1. A helmet, comprising:
a first shell that is constructed and arranged to be placed on the head;
a second shell that substantially surrounds and is spaced from the first shell;
one or more energy absorption subassemblies located between the first and second shells, each energy absorption subassembly of the one or more energy absorption subassemblies comprising generally concentric spaced rings comprising an inner ring and an outer ring, and a plurality of elastomeric energy-absorption members mechanically coupled to both the inner ring and the outer ring and spanning the distance between the rings, wherein the plurality of energy-absorption members are spaced around at least most of the circumferences of the inner and outer rings;
each elastomeric energy-absorption member constructed as an elastomeric extension spring configured to resist a tensile load generated by the first shell that pulls along a direction of a length of the elastomeric energy-absorption member; and
wherein the inner ring of each energy absorption subassembly is fixed to the outside of the first shell, and the outer ring of each energy absorption subassembly is fixed to the inside of the second shell;
each elastomeric energy-absorption member of the plurality of elastomeric energy-absorption members being disposed (i) at a first length between the first shell and the second shell in the absence of a load in an impact receiving location of the first shell and (ii) at a second length between the first shell and the second shell in the presence of a load in the impact receiving location,
the second length of the elastomeric energy-absorption members located substantially within the impact receiving location being less than the first length of the elastomeric energy-absorption members located substantially within the impact receiving location, and
the second length of the elastomeric energy-absorption members located at a location that is substantially opposite to the impact receiving location being greater than the first length of the elastomeric energy-absorption members located at the location that is substantially opposite to the impact receiving location.
2. The helmet of claim 1 , wherein disposition of the elastomeric energy-absorption members at the location that is substantially opposite to the impact receiving location between the first length and the second length is configured to absorb energy in the presence of the load in the impact receiving location.
3. The helmet of claim 1 , wherein for each elastomeric energy-absorption member of the plurality of elastomeric energy-absorption members disposed at a second length between the first shell and the second shell in the presence of a load in the impact receiving location, the second length of the elastomeric energy-absorption members located substantially within the impact receiving location being less than the first length of the elastomeric energy-absorption members located substantially within the impact receiving location, each elastomeric energy-absorption member comprises:
at least a first portion of the elastomeric energy-absorption member folded upon a second portion of the elastomeric energy-absorption member.