ADDITIVELY MANUFACTURED LATTICE CORE FOR ENERGY ABSORBERS ADAPTABLE TO DIFFERENT IMPACT LOAD CASES
First Claim
1. An energy absorber comprising:
- a cover defining a cavity; and
a lattice core including rod-shaped links having first and second ends connected at spaced nodes to form a three dimensional structure disposed inside the cavity, the lattice core including a first portion and a second portion that has a higher density than the first portion arranged behind the first portion relative to an expected direction of an impact with an object that initially contacts cover.
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Accused Products
Abstract
An energy absorber including a cover defining a cavity and a lattice core. The lattice core includes rod-shaped links having first and second ends connected at spaced nodes to form a three-dimensional structure disposed inside the cavity. The lattice core includes a first portion and a second portion that has a higher density than the first portion. The second portion is arranged behind the first portion relative to an expected direction of an impact with an object that initially contacts the cover in front of the first portion. A third portion may be arranged behind the second portion relative to the expected direction of an impact that has a higher density than the second portion. The first core may be a three-dimensional body having a negative Poisson'"'"'s Ratio. The lattice core may be formed by an additive printing process.
15 Citations
15 Claims
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1. An energy absorber comprising:
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a cover defining a cavity; and a lattice core including rod-shaped links having first and second ends connected at spaced nodes to form a three dimensional structure disposed inside the cavity, the lattice core including a first portion and a second portion that has a higher density than the first portion arranged behind the first portion relative to an expected direction of an impact with an object that initially contacts cover. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An energy absorber comprising:
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an enclosure; a first core formed of rod-shaped links connected at spaced nodes forming a first three-dimensional body having a negative Poisson'"'"'s Ratio; and a second core of rod-shaped links having first and second ends connected at spaced nodes forming a second three-dimensional body having a positive Poisson'"'"'s Ratio and being disposed inside the enclosure behind the first core relative to an expected direction of an impact with an object. - View Dependent Claims (8, 9)
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10. A method of manufacturing an energy absorber comprising:
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printing a first lattice core having a plurality of links connected at spaced nodes to form a three-dimensional body having a negative Poisson'"'"'s Ratio; printing a second lattice core having a second plurality of links connected at spaced nodes to form a three-dimensional body having a positive Poisson'"'"'s Ratio; solidifying the first and second lattice cores; and assembling the first and second lattice cores within an enclosure. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification