Shoe innersole

• US 4,187,621 A
• Filed: 04/24/1978
• Issued: 02/12/1980
• Est. Priority Date: 04/24/1978
• Status: Expired due to Term

• Current Assignee: Leon H. Cohen
• Original Assignee: Leon H. Cohen
• Inventors: Cohen, Leon H.
• Primary Examiner(s): Kee Chi, James
• Application Number:
  US05/898,935
• Time in Patent Office: 659 Days
• Field of Search: 36/44, 36/43, 428/315, 428/311, 428/310
• US Class Current: 36/44
• CPC Class Codes: A43B 13/38 Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process
• CPC Class Codes: Y10T 428/249981 Plural void-containing components

Abstract

A molded innersole for athletic and other shoes provides comfort and healthful distribution of weight on the foot through a construction which has laminated layers. A bottom layer of greater density and rigidity than a top layer (towards the foot of the wearer) with the construction of the top layer being softer and designed to take a partial compression set to produce a substantially permanent image of the wearer'"'"'s toes, metatarsal arch and ball of the foot, at least. The upper soft layer is made of a closed cell foam and affords high impact absorption. The bottom layer is a firmer construction and performs the function when molded of retaining the general shape of the last used to make a specific shoe. Preferably both of these layers are made substantially of cross-linked polyethylene. Preferably a fabric moisture absorbing layer is provided above the said top layer, although other top layers may be used. The product is also highly resistant to tear and abrasion.

Claims

1. Innersole for athletic shoes and the like comprising, a molded laminate of two layers completely bonded at their interface and cut and conformed in contour and varying thickness thereof to the last shape of the shoe with which the innersole is associated, the laminate having,

a relatively soft upper (towards the foot of the wearer) layer of 30-100 kilograms per cubic meter density and a compression set of 20-40% cellular plastic material and,

a lower layer of relatively hard cellular plastic material of 100-200 kilogram per cubic meter density and 1-6% compression set.

2. The product of claim 1 wherein both layers comprise cross-linked, closed cell polyethylene of different densities.

3. The product of either of claims 1 or 2 as made by forming a laminate, as described, in a first thickness (of the total) and molding under low pressure, less than 500 lbs. per square inch, to final thickness of about half of the original and which conforms to the last of the shoe with which the innersole will be associated.

4. Product of either of claims 1 or 2 wherein the material components are selected and constructed so that the molded laminate combination thereof is further molded to depart from the general shape of the last to conform to the specific shape of each individual foot while it is being worn and to take a permanent set in the latter form.