Insole and shoe stretcher, and method of manufacturing shoes

Boot and shoe making – Forms – With fastener receiving means

Reexamination Certificate

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Details

C012S141000, C012S12800F

Reexamination Certificate

active

06502266

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a shoe insole and a wooden shoe mold as well as to a method for manufacturing shoes by attaching in a freely detachable manner (or detachably attaching) a shoe insole or inner sole to a wooden shoe mold for facilitating the operation of tucking for the manufacturing process of shoes. More specifically the present invention relates to a shoe insole and a wooden shoe mold, both of which are cost-effective and of a simple construction, and to a method of manufacturing shoes by employing a construction comprising a wooden mold having suckers or sucking discs, which provides the means for attaching in a freely detachable manner, and an insole having a generally flat surface which faces against the suckers.
2. Description of the Prior Art
With reference to
FIG. 4
, an overview of manufacturing process of shoes in the prior art will be first described. In step (a), a vamp (shoe upper)
11
is formed by sewing or stitching together pieces of genuine or synthetic leather. In step (b), an insole
13
is attached to the wooden shoe mold
12
by applying glues or by driving nails.
Then in step (c), the wooden mold
12
is covered by the vamp
11
thereafter to effectuate the sewing along the lower margin of the vamp
11
to the outer periphery of the insole
13
, or in other words, to effectuate the tucking operation. For the purpose of enhancing the adhesion characteristics of a shoe bottom or bottom sole in later steps, the bottom surface of the vamp
11
will be napped.
The steps thereafter may vary depending on the method employed, such as VP manufacturing method, CP manufacturing method, and the like. For example, typically employed CP manufacturing method is described below. In step (d), mid-sole inserts such as a shankpiece
14
and a toe box
15
and the like are incorporated into the insole
13
. In step (e), the shoe bottom
16
formed by rubber, leather and the like is made.
Then in step (f), a press
17
is used to glue the shoe bottom
16
to the vamp
11
and to the bottom surface of insole
13
by using an adhesive. A sock lining is put inside of a shoe and attached onto the upper surface of the insole
13
. A shoe manufacturing is then completed.
Problem to be Solved by the Invention
In Japanese Published Laid-open Patent Application No. Hei 06- 093753, which was filed by the same applicant as that of the present application, an epoch making invention is disclosed, which method considerably simplifies the conventional manufacturing process of shoes based on driving nails or on bonding by glues. The above invention discloses, as a detachably attaching means which effectuates detachably attaching to a wooden shoe mold, such materials as a magnetically attractive material, hooks, Magic Tape (or Velcro) and the like. Each of such materials has its merits and demerits, and for example, a magnetically attractive material which has a magnetic power suitable for the purpose of the present invention may be expensive, and hooks or Velcro may deteriorate the comfort of shoes because of the parts left in the insole which constitutes one of the members which form the detachably attaching means.
Furthermore, even with the magnetic force of magnetic materials commercially available in the market today, because the magnetic flux density achievable in such materials, although the retention characteristics in the vertical direction with respect to the bottom surface of the wooden shoe mold is suitable, there may be cases in which providing the magnetically attractive material partially in limited regions may not be sufficient and thereby making it necessary to provide the magnetically attractive material over the entire surface of the insole for increasing the retention characteristics in the direction along the same plane as that of the bottom surface of the wooden mold so that they are sufficiently increased to the level required in the actual process of manufacturing shoes, but the cost may be accordingly increased, and thus, the field of applications may be limited.
One of the objects of the present invention is to provide a means for attaching and detaching in a freely detachable fashion, which enables a speedy operation of attaching the insole to the wooden shoe mold, which enables an easy correction of the alignment of the insole even when the insole is attached to the wooden shoe mold in a misaligned fashion, which does not pose such a danger of failing to pull out nails, and which does not require a large increase in the equipment cost, and also to provide a method of manufacturing shoes which uses such a detachably attaching means, wherein the method of manufacturing shoes providing detachable means wherein, even when the insole of a shoe is detachably attached to the bottom surface of a wooden mold, there may be provided the retention characteristics in the same plane as that of the bottom surface of the mold sufficient for the manufacturing of shoes, as well as to provide a method of manufacturing shoes by using such a means.
Furthermore, the present invention makes it also possible to provide an insole attached to the wooden mold where the insole is automatically detached, after a certain period of time elapses, from the wooden shoe mold without requiring any additional operation, and whereby another object of the present invention is to provide a method of manufacturing shoes which is capable of further simplifying the manufacturing process than that of a process which uses a detachably attaching means of the prior art.
Means for Solving the Problem
In order to achieve the foregoing objects, the insole of the present invention is characterized in that it comprises a generally flat surface which makes the attaching of the insole to the wooden shoe mold to be freely detachable.
The wooden shoe mold in accordance with the present invention is characterized in that there are provided suckers or sucking discs which makes the attaching of the insole of a shoe to become freely detachable. Any sucking means known in the prior arts may be used which provides such effects as similar to that of function of holding or retention obtained by reducing the pressure in the volume space between the sucker and the generally flat surface mating the sucker and being adhered by suction thereby. An example of sucking means may be found in such a means of communicating a decompression pump of prior arts with the foregoing volume formed between the sucker and the generally flat surface.
The generally flat surface in accordance with the present invention may be the surface of the shoe insole itself, or an additional plate having a generally flat surface and being provided on one surface of the insole. In the latter case, the plate having a generally flat surface and the one surface of the insole may be joined with a means known in the art, preferably by using some adhesive, or in some cases, such a plate may be embedded into the insole, or the one surface of the insole may be flattened by any known method including the method of applying to the surface of the insole, for generally flattening the surface of the insole by hardening, some adhesive materials, such as adhesives which may transformed from a liquid state to a solid state by hardening.
In accordance with the method of manufacturing shoes of the present invention, there are provided, as a means for attaching in a freely detachable fashion, suckers in the wooden shoe mold and a generally flat surface on the insole, respectively, while each of the suckers is mating and corresponding to the surface, and thus, the invention is characterized in that the insole is detachably attached to the bottom of the wooden mold, by using any known methods for adhering suckers by suction on a flat surface, to carry out and complete the operation of tucking after covering a vamp on the wooden mold.
In the present invention, the generally flat surface being provided in the shoe insole and mating the suckers provided in the wooden mold may have minute asperities or otherwise gro

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