Shoe having an air pump device with a spring element clasping a bellows

1. A shoe having a sole structure and at least one air pump device for blowing air into an interior of the shoe, said air pump device comprising:

a bellows made from an elastic plastic material, formed in the sole structure and surrounding a cavity,

an intake channel for transporting air from an intake opening into the bellows, and

an air supply device formed in the sole structure for forwarding air from the bellows into the interior of the shoe,

said air pump device comprising a V-shaped or U-shaped spring element which clasps the bellows, an upper leg of the spring element comprising an upper pressure plate arranged above the bellows and below an insole of the sole structure, and a lower leg of the spring element comprising a lower pressure plate arranged under the bellows and above an outsole layer of the sole structure, so that a connecting section of the spring element that connects to the two legs is arranged beside the bellows in the sole structure, and

said air pump device being arranged in such a manner that when the sole structure is placed under load by the weight of the wearer of the shoe during a walking movement, the spring element is deformed elastically by pressing the pressure plates together, wherein the deformation takes place substantially at or close to the connecting section, so that the pressure plates above and below the bellows substantially keep their shape, and the bellows arranged between the pressure plates is compressed,

wherein the bellows of the air pump device is arranged in a heel area of the shoe, and the spring element extends substantially over the entire area of the heel area,

wherein the connecting section is arranged in a joint area of the shoe and/or in an peripheral area of the heel area adjacent to the joint area,

wherein at least one stabilizer spring element is arranged on both sides of the bellows,

wherein each of the stabilizer spring elements is connected to lateral peripheral areas of the upper and lower pressure plates in such a manner that it can be compressed elastically when the pressure plates are pressed together,

wherein a support section is formed on the connecting section in the opposite direction to the legs, so that the spring element is Y-shaped, wherein the support section protrudes into the joint area of the shoe to no more than about 10 mm before reaching a ball-of-the-foot area within a forefoot area,

wherein the lateral peripheral areas of the upper and lower pressure plates, to which the stabilizer spring elements are connected, form bearing surfaces for respective upper and lower ends of the stabilizer spring elements, and

wherein the elasticity of the stabilizer spring elements arranged on both sides of the shoe is adjusted such that they are pressed together to approximately the same degree when load on the sole structure due to the weight of the wearer of the shoe during a running motion causes them to be pressed together, which has the effect of counteracting a rotation of the upper pressure plate with respect to the lower pressure plate about an axis parallel to the lengthwise direction of the shoe, wherein the peripheral areas arranged on both sides of the lower pressure plate are each separated from a middle area of the lower pressure plate located below the bellows by a gap which is open towards the back side of the shoe, so that both peripheral areas of the lower pressure plate form separate spring legs, and

wherein the middle area of the lower pressure plate projects downwards, so that the pressing together of the bearing surfaces and therewith of the stabilizer spring elements as well does not begin until after the middle area of the lower pressure plate and the upper pressure plate have been pressed together by a predetermined distance.

2. The shoe according to claim 1 , wherein the stabilizer spring elements are fastened detachably or replaceably.

3. The shoe according to claim 1 , wherein folds are formed in the side walls of the bellows on the open sides of the spring element.

4. A shoe having a sole structure and at least one air pump device for blowing air into an interior of the shoe, said air pump device comprising:

a bellows made from an elastic plastic material, formed in the sole structure and surrounding a cavity,

an intake channel for transporting air from an intake opening into the bellows, and

an air supply device formed in the sole structure for forwarding air from the bellows into the interior of the shoe,

said air pump device comprising a V-shaped or U-shaped spring element which clasps the bellows, an upper leg of the spring element comprising an upper pressure plate arranged above the bellows and below an insole of the sole structure, and a lower leg of the spring element comprising a lower pressure plate arranged under the bellows and above an outsole layer of the sole structure, so that a connecting section of the spring element that connects to the two legs is arranged beside the bellows in the sole structure, and

said air pump device being arranged in such a manner that when the sole structure is placed under load by the weight of the wearer of the shoe during a walking movement, the spring element is deformed elastically by pressing the pressure plates together, wherein the deformation takes place substantially at or close to the connecting section, so that the pressure plates above and below the bellows substantially keep their shape, and the bellows arranged between the pressure plates is compressed,

wherein the bellows of the air pump device is arranged in a heel area of the shoe, and the spring element extends substantially over the entire area of the heel area,

wherein the connecting section is arranged in a joint area of the shoe and/or in an peripheral area of the heel area adjacent to the joint area,

wherein at least one stabilizer spring element is arranged on both sides of the bellows,

wherein each of the stabilizer spring elements is connected to lateral peripheral areas of the upper and lower pressure plates in such a manner that it can be compressed elastically when the pressure plates are pressed together,

and wherein the elasticity of the stabilizer spring elements arranged on both sides of the shoe is adjusted such that they are pressed together to approximately the same degree when load on the sole structure due to the weight of the wearer of the shoe during a running motion causes them to be pressed together, which has the effect of counteracting a rotation of the upper pressure plate with respect to the lower pressure plate about an axis parallel to the lengthwise direction of the shoe, wherein the lateral peripheral areas of the upper and lower pressure plates, to which the stabilizer spring elements are connected, form bearing surfaces for respective upper and lower ends of the stabilizer spring elements, and

wherein the peripheral areas arranged on both sides of the lower pressure plate are each separated from a middle area of the lower pressure plate located below the bellows by a gap which is open towards the back side of the shoe, so that both peripheral areas of the lower pressure plate form separate spring legs, and

wherein the middle area of the lower pressure plate projects downwards, so that the pressing together of the bearing surfaces and therewith of the stabilizer spring elements as well does not begin until after the middle area of the lower pressure plate and the upper pressure plate have been pressed together by a predetermined distance.

5. The shoe according to claim 4 , wherein the stabilizer spring elements are fastened detachably or replaceably.

6. The shoe according to claim 4 , wherein folds are formed in the side walls of the bellows on the open sides of the spring element.