Inflatable shoe insert
Provided is an inflatable shoe insert for inserting in a shoe. The insert comprises first and second web plies that are sealed together at a plurality of seals that define an air chamber. The air chamber includes a front region having a toe expansion region uninterrupted by seals over an area so that when fully inflated, the front region expands to a height and medial-lateral width to support the shoe upper against collapsing. The air chamber further includes a retention portion having a region in which the seals are spaced closer together than in the toe expansion region so that when fully inflated, the retention portion expands to a medial-lateral width that is smaller than that in the toe expansion region, the retention portion having an anterior-posterior length that reaches the heel of the shoe to retain the front region in the toe box by pressure against the heel.
1. A web for an inflatable shoe insert for inserting in a shoe, comprising:
first and second web plies that are sealed together at a plurality of seals that define:
a plurality of air chambers therebetween, and
an inflation area connecting the air chambers to direct the fluid into the air chambers to inflate the chambers, the web including:
a first separation region extending across at least a portion of the web between a first pair of adjacent air chambers, the first separation region facilitating separation of the air chambers of the first pair from each other, and
a second separation region extending across the web between a second of adjacent air chambers, the second separation region facilitating partial separation of the air chambers of the second pair from each other while leaving the air chambers of the second pair attached at the inflation area, wherein the second separation region extends across a smaller portion of the web than the first separation region making it more difficult to fully separate the web along the second separation region, wherein the first and second separation regions comprise first and second lines of weakness that facilitate the separation by tearing.
2. The web of claim 1 , wherein the plurality of seals are configured so that the air chambers include:
a front region having a toe expansion region that is uninterrupted by seals over an area that is sufficiently large so that when fully inflated, the front region expands to an inflation height and a medial-lateral width sufficient to support a shoe upper of the shoe against collapsing; and
a posterior retention portion in fluid communication with the front region and having an retention expansion region in which the seals are spaced closer together than in the toe expansion region so that when fully inflated, the posterior retention portion expands to a medial-lateral width that is smaller than that in the toe expansion region, the posterior retention portion having an anterior-posterior length configured to reach the heel of the shoe to retain the front region in the toe box by pressure against the heel.
3. The web of claim 2 , wherein, when fully inflated, the posterior retention portion expands to an inflation height that is smaller than that in the toe expansion region.
4. The web of claim 3 , wherein at least one intermediate seal seals together the first and second web plies within the posterior retention portion.
5. The web of claim 2 , wherein, when fully inflated, the front region expands to a medial-lateral width that is sufficient to contact medial and lateral interior portions of the shoe.
6. The web of claim 2 , wherein, when fully inflated, the air within the air chamber has an air pressure above atmospheric pressure.
7. The web of claim 2 , wherein the posterior retention portion comprises a flexible region and a heel portion.
8. The web of claim 7 , wherein, when fully inflated, the heel portion expands to an inflation height and a medial-lateral width that are both greater than those in the flexible region.
9. The web of claim 8 , wherein, when fully inflated, the heel portion expands to an inflation height that is at least twice the inflation height of the flexible region.
10. The web of claim 2 , wherein the posterior retention portion is defined by medial and lateral seals that extend substantially parallel to one another until they converge towards one another near a posterior edge of the air chamber.
11. An assembly, comprising:
a shoe; and
the web of claim 2 received within a shoe.
12. The assembly of claim 11 , wherein the insert is sufficiently inflated so that a top portion of the insert contacts an upper interior portion of the shoe, and medial and lateral interior portions of the insert contact medial and lateral portions of the shoe.
13. The assembly of claim 11 , wherein the posterior retention portion abuts an interior heel portion of the shoe.
14. The assembly of claim 11 , wherein a posterior-anterior length of the shoe cavity of the shoe is less than a posterior-anterior length of the insert.
15. The web of claim 1 , wherein the second line of weakness extends short of the inflation region.
16. The web of claim 1 , wherein the first line of weakness extends across the inflation region.
17. The web of claim 2 , wherein the first and second separation regions comprise first and second lines of weakness that facilitate the separation by tearing.
18. The web of claim 17 , wherein each air chamber forms a shoe insert having the front region and the posterior retention portion and the first and second separation regions are arranged such that the air chambers tend to be separated as pairs with each pair having an attachment at the inflation region.