Classifications

• • A—HUMAN NECESSITIES
  • A43—FOOTWEAR
  • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
  • A43D3/00—Lasts
  • A43D3/04—Pneumatic lasts; Elastic lasts

Definitions

• the present invention relates to a boot or shoe tree that contains a last element to be inserted into the boot or shoe to be tensioned.
• the last element consists of a closed, airtight membrane forming a cavity.
• This last in a sense similar to a balloon, is first brought into the boot or into the shoe and then inflated or inflated to the desired size and the appropriate pressure.
• Fig. 1 the last element of a pneumatic tensioner for high shaft boots, according to the present invention.
• Fig. 2 is an analog, the shape and size of a shoe correspondingly dimensioned last element.
• the last element 1 shown in the drawings essentially consists of a closed, airtight membrane 3, 4, a balloon-like structure which is inflated or inflated to tension the boot after it is not in the is inflated into the boot or shoe.
• This strip element 1 preferably consists of vulcanized rubber or a sufficiently elastic plastic.
• the material used can largely be used to manufacture air tubes for bicycle or car tires used materials to be similar.
• the last element 1 In the outer shape and dimensioning, the last element 1 only needs to be roughly adapted to the shape and size of the matching boot.
• the length of the leg section does not have to match the height of the boot exactly.
• a last element according to the present invention will fit all boots of a user; a certain last element will also be used for both the right and the left boot.
• the shape of the strip element 1 has a special feature on its upper side.
• a bead is provided there on the outside, as illustrated by the membrane 3 shown in sections in the longitudinal section.
• the ring-shaped bead that forms in the manner of a trough in the upper side of the last element 1 results from the formation.
• the valve of a bicycle or car tire air tube is used as the closure element.
• the aforementioned depression in the top of the last element 1 is designed to be sufficiently deep so that the pneumatic valve used does not protrude over the bead edge.
• the choice of the wall thickness of the membrane used is not particularly critical. It is chosen to be somewhat thinner where the last element 1 is more likely to adapt to the footwear in shape and size; where the boot should be stretched less and in the vicinity of the closable opening 2, it is chosen to be somewhat thicker.
• the wall thickness of the membrane 3 in the bead and in the vicinity thereof and in the valve 2 is approximately 3 mm, while rend the membrane 4 is now everywhere about 1 strong now.
• the choice of the optimal wall thickness must be made taking into account the material properties and the type of footwear.
• valve elements other than those mentioned here as closable opening 2 can also be used, such as the simple inflatable connections found in air mattresses with a closing pin or the like.
• the air is simply let out of the last element 1 by opening the closable opening 2, after which the last element 1 can be pulled out of the boot or shoe without any effort and without effort . Its space requirement when not in use is extremely small, since it is completely flat in the air-free state and can be rolled up if necessary.

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• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4183878

Family Applications (1)

Country Status (2)

Cited By (7)

Families Citing this family (1)

Citations (2)

• 1989
  • 1989-01-30 CH CH30189A patent/CH677065A5/de not_active IP Right Cessation
  • 1989-03-08 WO PCT/CH1989/000041 patent/WO1990008487A1/de unknown

Patent Citations (2)

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