Tethered fluid-filled chamber with multiple tether configurations
An article comprises a chamber that includes a barrier formed from a polymer material. The barrier has a first portion that forms a first surface of the chamber, and a second portion that forms an opposite second surface of the chamber. The barrier forms at least one interior cavity between the first portion and the second portion. The at least one interior cavity is filled with fluid retained by the barrier. Tethers of different configurations operatively connect the first portion and the second portion.
1. An article of footwear comprising:
a barrier having a heel region, a midfoot region forward of the heel region, and a forefoot region forward of the midfoot region, the barrier including:
a first portion that includes a first surface of the barrier;
a second portion that includes a second surface of the barrier opposite from the first surface;
at least one interior cavity between the first portion and the second portion that retains fluid;
a plurality of first tethers in said at least one interior cavity and operatively connecting the first portion to the second portion;
a plurality of second tethers in said at least one interior cavity forward of the plurality of first tethers and operatively connecting the first portion to the second portion;
wherein the first tethers have a first configuration, and the second tethers have a second configuration different than the first configuration;
wherein the first portion is a first sheet and the second portion is a second sheet;
wherein the barrier includes a bond that secures an inner surface of the first sheet of the barrier to an inner surface of the second sheet of the barrier and separates the at least one interior cavity into a first interior cavity and a second interior cavity, with the first interior cavity extending in the heel region, the midfoot region, and the forefoot region, and the second interior cavity extending only in the forefoot region forward of the first interior cavity;
an outsole secured to the second sheet of the barrier; wherein the outsole includes:
a first outsole portion extending under the first interior cavity; and
a second outsole portion extending under the second interior cavity and separated from the first outsole portion by a gap, with the bond aligned with and overlying the gap such that the second surface is exposed between the first outsole portion and the second outsole portion at the bond.
2. The article of footwear of claim 1 , wherein the first tethers are in the heel region and the second tethers are in the midfoot region.
3. The article of footwear of claim 1 , wherein:
the first interior cavity extends from a medial side of the barrier to a lateral side of the barrier; and
the second interior cavity extends from the medial side of the barrier to the lateral side of the barrier.
4. The article of footwear of claim 3 , wherein the second sheet forms a groove underlying and aligned with the bond extending from the medial side of the barrier to the lateral side of the barrier between the first interior cavity and the second interior cavity.
5. The article of footwear of claim 4 , wherein the groove has a medial end at the medial side of the barrier, a lateral end at the lateral side of the barrier, and a midportion that arcs forward between the medial end and the lateral end.
6. The article of footwear of claim 5 , wherein:
the barrier includes a channel that traverses the groove and fluidly connects the first interior cavity and the second interior cavity.
7. The article of footwear of claim 6 , wherein the channel is disposed entirely between a longitudinal midline of the barrier and the lateral side of the barrier.
8. The article of footwear of claim 1 , wherein:
the barrier has at least one notch in a periphery of the heel portion; and
the barrier includes an additional bond that secures the first sheet to the second sheet and overlies the at least one notch.
9. The article of footwear of claim 8 , wherein:
the first outsole portion includes:
a medial sidewall secured to and confronting the medial side of the barrier at the heel portion;
a lateral sidewall secured to and confronting the lateral side of the barrier at the heel portion; and
one of the medial sidewall of the first outsole portion and the lateral sidewall of the first outsole portion extends along and confronts the heel portion of the barrier in the at least one notch under the additional bond.
10. The article of footwear of claim 8 , wherein the at least one notch includes a first notch in the periphery of the heel portion at a medial side of the barrier, and a second notch in the periphery of the heel portion at a lateral side of the barrier.
11. The article of footwear of claim 10 , wherein the barrier has a third notch forward of the first notch at the periphery of the heel portion at the medial side of the barrier, and a fourth notch forward of the second notch at the periphery of the heel portion at the lateral side of the barrier.
12. The article of footwear of claim 1 , wherein:
the barrier includes a groove that extends from the medial side of the barrier to the lateral side of the barrier between the first interior cavity and the second interior cavity;
the barrier includes a channel that traverses the groove and fluidly connects the first interior cavity and the second interior cavity;
the outsole includes a third outsole portion that traverses the gap and connects the first outsole portion and the second outsole portion such that the outsole is a unitary, one-piece outsole; and
the third outsole portion is secured to the channel.
13. The article of footwear of claim 1 , wherein:
the barrier includes a groove that extends from the medial side of the barrier to the lateral side of the barrier between the first interior cavity and the second interior cavity;
the first outsole portion is secured to and extends along a first wall of the second portion of the barrier in the groove;
the second outsole portion is secured to and extends along a second wall of the second barrier portion in the groove;
the first wall and the second wall extend from the medial side of the barrier to the lateral side of the barrier;
the first wall faces the second wall; and
the second surface is exposed between the first wall and the second wall in the gap.
14. The article of footwear of claim 1 , wherein:
the first outsole portion includes:
a medial sidewall secured to and confronting the medial side of the barrier at the heel portion;
a lateral sidewall secured to and confronting the lateral side of the barrier at the heel portion; and
the medial sidewall of the first outsole portion is taller than the lateral sidewall of the first outsole portion.
15. The article of footwear of claim 14 , wherein the lateral side of the barrier is exposed above the lateral sidewall of the first outsole portion.
16. The article of footwear of claim 1 , further comprising:
a midsole secured to the first surface of the barrier.
17. The article of footwear of claim 16 , wherein the midsole has an aperture extending completely through the midsole and overlaying the heel portion of the barrier.
18. The article of footwear of claim 16 , wherein:
the second sheet of the barrier includes a groove extending from a medial side of the barrier to a lateral side of the barrier between the first interior cavity and the second interior cavity and under the bond; and
the midsole has an aperture extending completely through the midsole and overlaying the forefoot portion of the barrier at the bond.