Strain-hardened safety toe for footwear
A protective device, in particular a safety toe cap, for use with an article of footwear is provided. A safety toe cap of the present technology includes one or more strain hardened portions configured to strengthen or reinforce sections of the safety toe cap against impact, particularly from above. The one or more strain hardened portions have increased strength in relation to adjacent non-strain hardened portions and therefore may maintain adequate protection of a user's toes and foot, while simultaneously allowing for lowered material use and a device with a lightweight, streamlined profile.
1. A protective toe cap for an article of footwear, comprising:
a hemi-dome shaped body adapted to cover a user's toes once incorporated into an article a footwear,
the body having opposing inner and outer surfaces, a forefoot side, a midfoot side, a medial side, and a lateral side,
the body further comprising at least one strain hardened portion and at least one non-strain hardened portion,
wherein a thickness of the at least one strain hardened portion is smaller than a thickness of the non-strain hardened portion, and
wherein the at least one strain hardened portion is formed as a depression in at least one of the inner surface and the outer surface without a corresponding protrusion present on the opposing surface.
2. The protective toe cap of claim 1 , wherein the at least one non-strain hardened portion has a yield strength of about 350 MPa to about 880 MPa.
3. The protective toe cap of claim 1 , wherein the at least one non-strain hardened portion has a yield strength of about 400 MPa to about 500 MPa.
4. The protective toe cap of claim 1 , wherein the at least one strain hardened portion has a yield strength which is increased by about 1% to about 2% with respect to a yield strength of the at least one non-strain hardened portion.
5. The protective toe cap of claim 1 , wherein the at least one strain hardened portion has a hardness which is increased by about 2% to about 4% with respect to a hardness of the at least one non-strain hardened portion.
6. The protective toe cap of claim 1 , wherein the protective toe cap has a thickness of no more than 3.0 mm.
7. The protective toe cap of claim 1 , wherein the protective toe cap has a thickness of no more than 2.8 mm.
8. The protective toe cap of claim 1 , wherein the thickness of the at least one strain hardened portion is smaller than the thickness of the non-strain hardened portion by 0.2 mm to 1.0 mm.
9. The protective toe cap of claim 1 , wherein the protective toe cap is formed of a material comprising one or more of aluminum, steel, magnesium, titanium, or an alloy thereof.
10. The protective toe cap of claim 9 , wherein the protective toe cap is formed of an aluminum alloy.
11. The protective toe cap of claim 1 , wherein the at least one strain hardened portion is formed as a continuous channel in at least one of the inner and outer surface of the hemi-dome shaped body running from the medial side to the lateral side.
12. The protective toe cap of claim 1 , wherein the at least one strain hardened portion comprises two to four strain hardened portions.
13. The protective toe cap of claim 1 , wherein the at least one strain hardened portion is disposed nearer the midfoot side than the forefoot side.
14. An article of footwear comprising:
an upper defining a cavity adapted to receive the foot of a user, wherein the upper is attached to an outsole; and
a protective toe cap positioned adjacent a toe region of the footwear, the protective toe cap comprising a hemi-dome shaped body adapted to cover the user's toes,
the body having opposing inner and outer surfaces, a forefoot side, a midfoot side, a medial side, a lateral side, and a lower lip extending along a perimeter of the body configured to attach the protective toe cap to a sole portion of the article of footwear,
the body further comprising at least one strain-hardened portion and at least one non-strain hardened portion,
wherein a thickness of the at least one strain hardened portion is smaller than a thickness of the non-strain hardened portion, and
wherein the at least one strain hardened portion is formed as a depression in at least one of the inner surface and the outer surface without a corresponding protrusion present on the opposing surface.