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US 5,230,170 AGranted
Root warmer insole and method
OwnerRobert S. Dahleinventor
Life of this patent
Estimating the term…
Abstract
An insole for a boot or the like has a cavity in the padding layer for holding a heat source that produces heat from an exothermic chemical reaction. The cavity is preferably located in the toe portion of the padding layer. The upper layer of the insole preferably has a plurality of holes therein for facilitating heat transfer from the heat source to the foot of a person using the insole. A pull cord may be connected to the stabilizer layer for facilitating removal of the insole from a boot or the like.
Claims9
An insole for a boot or shoe, comprising:
- a heat source;
- an upper layer of a resilient material;
- a padding layer connected to the upper layer, the upper layer and the padding layer being formed to have a periphery that is in the general shape of the outline of the sole of a human foot and having a heel portion and a toe portion so that the insole will fit inside a boot or shoe;
- a compressed section in the toe portion extending across the toe section, the compressed section having a pair of ledges on opposite sides thereof that define front and rear edges of the compressed section;
- and
- a cover plate placed over the compressed section and having edges connected by stitching to the front and rear edges of the compressed section to define a cavity for holding the heat source therein, the cover plate being sufficiently rigid to stabilize the shape of the heat source and maintain it in a flattened configuration to assure comfort to the foot of a person wearing a boot or shoe in which the insole is inserted, the cover plate having a thickness such that the cover plate does not extend beyond the thickness of the insole adjacent the front and rear edges of the compressed section.
3 more elements
Dependencies are inferred from the claim text.