U.S. patent number 3,807,062 [Application Number 05/337,779] was granted by the patent office on 1974-04-30 for athletic boot.
This patent grant is currently assigned to Karku-Sport AB. Invention is credited to I. Martin Spier.
United States Patent |
3,807,062 |
Spier |
April 30, 1974 |
ATHLETIC BOOT
Abstract
An athletic boot especially suitable for the construction of
cross-country ski boots and ice skate boots, particularly ice
hockey skate boots in which an inner molded shell is formed of a
stiff or rigid material for providing rigidity at selected
locations and an outer shell is molded about the inner shell, with
the outer shell comprised of a dissimilar material having generally
flexible and preferably abrasion-resistant characteristics to
provide flexibility at selected locations and also provide an
exterior surface capable of resisting surface wear and abrasion.
The invention is concerned with the boot construction.
Inventors: |
Spier; I. Martin (New York,
NY) |
Assignee: |
Karku-Sport AB (Helsinki,
SF)
|
Family
ID: |
26806180 |
Appl.
No.: |
05/337,779 |
Filed: |
March 5, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
108705 |
Jan 22, 1971 |
3718994 |
Mar 6, 1973 |
|
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Current U.S.
Class: |
36/117.2;
36/117.1 |
Current CPC
Class: |
A43B
1/0018 (20130101); A43B 5/00 (20130101); A43B
13/141 (20130101); A43B 5/0413 (20130101); A43B
5/0411 (20130101); A43B 5/0421 (20130101); A43B
5/1683 (20130101); B29L 2031/501 (20130101) |
Current International
Class: |
A43B
13/14 (20060101); A43B 5/00 (20060101); A43B
5/04 (20060101); A43B 5/16 (20060101); A43b () |
Field of
Search: |
;36/2.5R,2.5AL |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lawson; Patrick D.
Attorney, Agent or Firm: Blum, Moscovitz, Friedman &
Kaplan
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of applicant's
Application Ser. No. 108,705, filed Jan. 22, 1971, now U.S. Pat.
No. 3,718,994, issued Mar. 6, 1973.
Claims
What is claimed is:
1. An athletic boot comprising a molded inner shell of a first
material and a molded outer shell of a second material bonded to
said inner shell, said inner shell defining at least a sole, a
heel, a back and ankle covering portions, said ankle covering
portions being joined to said heel only along said back whereby to
permit flexing of said inner shell along the longitudinal axis
thereof below said ankle covering portions, said inner shell being
formed of a generally rigid plastic material, said outer shell
defining a sole, a toe box, vamps, a heel and ankle and leg
encircling portions extending above said ankle covering portions of
said inner shell, said outer shell being formed of a generally
flexible plastic material.
2. An athletic boot as claimed in claim 1 including means
cooperating between said inner and outer shells for effecting a
mechanical interlock between said inner and outer shells.
3. An athletic boot as claimed in claim 2 wherein said mechanical
interlock means includes a plurality of apertures in said inner
shell and projections on said outer shell extending into said
apertures.
4. An athletic boot as claimed in claim 3 wherein at least some of
said apertures are in the form of truncated cones having the
smaller end thereof facing said outer shell and wherein said
projections closely follow the configuration of said apertures.
5. An athletic boot as claimed in claim 1 wherein said outer shell
further includes flaps extending outwardly of said vamps whereby to
effect closing of said boot about the foot of a wearer.
6. An athletic boot as claimed in claim 5 wherein each flap extends
from its associated vamp along a thinned section of outer shell
material.
7. An athletic boot comprising a molded inner shell of a first
material and a molded outer shell of a second material bonded to
said inner shell, said inner shell defining at least a sole and a
heel, said inner shell being formed of generally rigid plastic
material, said sole being constructed and arranged to permit
flexing thereof in the area forward of the area adapted for
receiving the ball of the foot, said outer shell defining a sole, a
toe box, vamps, a heel, a back and ankle encircling portions, said
outer shell being formed of a generally flexible plastic
material.
8. An athletic boot as claimed in claim 7 including means
cooperating between said inner and outer shells for effecting a
mechanical interlock between said inner and outer shells.
9. An athletic boot as claimed in claim 8 wherein said mechanical
interlock means includes a plurality of projections on said inner
shell extending into said outer shell.
10. An athletic boot as claimed in claim 7 wherein said outer shell
is constructed and arranged to permit flexing thereof in the area
forward and above the area adapted for receiving the ball of the
foot.
11. An athletic boot as claimed in claim 10 wherein said outer
shell construction includes accordian-like pleats in and above the
last named area.
12. A athletic boot as claimed in claim 7 wherein said inner shell
construction includes means for defining a plurality of thinned
sections in the area forward of the area adapted for receiving the
ball of the foot.
13. An athletic boot as claimed in claim 12 wherein said last named
means is formed as a series of corrugations.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to an improved boot construction
utilizing the teachings and principles as more particularly set
forth in my prior copending application. In recent years, a
revolution has taken place in the athletic boot industry, wherein
boots formerly constructed of leather have increasingly had plastic
substituted for the leather, especially in the fabrication of the
outer shell. The primary function of an athletic boot, including
cross-country ski boots and ice skate boots, is to provide proper
support for the foot of the wearer and especially a measure of
lateral rigidity, so that movements of the foot and ankle of the
wearer are transmitted without loss of motion through the boot to
the ski on which the boot is mounted by means of a binding or to
the ice skate blade which is rigidly attached to the boot.
It is also a requirement of the athletic boot that it have
sufficient flexibility to permit the boot to be opened so that the
boot may be put on and taken off, to permit the boot to be flexed
to close tightly about the foot of the wearer, and to permit a
measure of flexibility in the forward direction to permit the
wearer to flex his ankles while skiing or skating.
As discussed at length in my prior copending application, the
stiffness and rigidity characteristics required for proper support
contradict the flexing requirements, and prior to applicant's basic
invention, boot shells have been formed of material which strikes a
balance between the requisite rigidity and flexibility. To attain
rigidity with a somewhat flexible material, prior boots have
required a substantial buildup of thickness at selected locations,
making the boot unnecessarily heavy and bulky.
SUMMARY OF THE INVENTION
Generally speaking, in accordance with the invention, an athletic
boot is fabricated of inner and outer shell portions, preferably by
the method of first molding the inner shell portion and thereafter
molding the outer shell portion about the inner shell portion for
providing means, in addition to any chemical interlock that may
take place, to mechanically interlock the inner and outer shell
portions.
By utilizing inner and outer shell portions, different materials
may be selected having different stiffnesses, rigidity, flexibility
and wear characteristics. The inner shell portion having greater
rigidity is so arranged as to provide rigidity where required for
the particular athletic activity for which the boot is to be used,
while the outer shell portion, in addition to providing scuff and
wear resistance, will impart a measure of flexibility as required
for athletic boots of this type.
For a skate boot, rigidity is required along the sole of the foot,
about the heel and about the ankle portion, while permitting
considerable flexibility at the instep, so that the foot may bend
forwardly at the ankle joint.
For a cross-country boot, rigidity is required along the sole of
the foot and about the lower part of the heel, but a high degree of
flexibility is required where the foot bends between the ball and
the toes as required by the skiing techniques attendant
cross-country skiing.
Accordingly, it is an object of this invention to provide an
athletic boot of improved construction.
Another object of this invention is to provide an improved athletic
boot formed of multiple shell elements having flexibility at
preselected locations.
A further object of the invention is to provide a skate boot of
improved construction.
Still another object of the invention is to provide a cross-country
ski boot of improved construction.
Still other objects and advantages of the invention will in part be
obvious and will in part be apparent from the specification.
The invention accordingly comprises an article of manufacture
possessing the features, properties, and the relation of elements
which will be exemplified in the article hereinafter described, and
the scope of the invention will be indicated in the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the invention, reference is had to
the following description taken in connection with the accompanying
drawings, in which:
FIG. 1 is a top plan view of a skate boot constructed in accordance
with a preferred embodiment of the instant invention;
FIG. 2 is a sectional view taken along line 2--2 of FIG. 1;
FIG. 3 is a sectional view taken along line 3--3 of FIG. 2;
FIG. 4 is a sectional view taken along line 4--4 of FIG. 2;
FIG. 5 is an elevational view of a cross-country ski boot
constructed in accordance with a preferred embodiment of the
instant invention and showing the boot in the preferred position
for molding;
FIG. 6 is a top plan view of the boot of FIG. 5;
FIG. 7 is a sectional view, at an enlarged scale, taken along line
7--7 of FIG. 6;
FIG. 8 is a bottom plan view of the boot of FIG. 6;
FIG. 9 is a sectional view taken along line 9--9 of FIG. 7;
FIG. 10 is a sectional view taken along line 10--10 of FIG. 7;
and
FIG. 11 is a sectional view taken along line 11--11 of FIG. 7.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A skate boot constructed in accordance with the instant invention
is shown in FIGS. 1 through 4. The boot indicated generally at 20
has an inner shell 21 and an outer shell 22. The outer shell is
formed of a generally flexible plastic material having good
abrasion-resistance characteristics. Polyurethane and DuPont
"Hytrel" have been found as especially suitable for the outer
shell. Also, polyethylene or an ionomer which may be lighter and
less expensive than polyurethane are also satisfactory materials
for the outer shell 22. The inner shell 21 must be formed of a
relatively rigid plastic material to impart strength, stiffness and
rigidity to the boot. Materials such as expanded or nonexpanded
acrylonitrile-butadiene-styrene (ABS) has proven especially
satisfactory. Other materials may be acceptable, such as expanded
polyurethane or expanded or nonexpanded polystyrene or expanded
polypropylene. Scuff resistance is not a necessary characteristic
of inner shell 21, as the inner shell is substantially completely
protected against exterior abrasion by outer shell 22.
Inner shell 21 is formed with a toe box 23, sole 24, heel 25, back
26 and ankle-covering portions 27. When viewed in elevation, as
best seen in FIG. 2, heel 25 does not extend to ankle-covering
portions 27, thereby providing a cutout 28 on each side of inner
shell 21, whereby the heel 25 is joined to ankle-covering portions
27 only through back 26. It will be readily understood that the
cutout 28 eliminates the rigidity which would otherwise limit
flexing of the ankle with respect to the foot in the forward
direction at the ankle joint. Such flexing is required for skating
by both hockey and figure skaters, although the boot depicted in
FIGS. 1 through 4 is especially designed to be used as a hockey
skate boot.
Inner shell 21 is formed with a plurality of apertures 29
therethrough, with the apertures being in the form of a truncated
cone having the small end positioned to the exterior of inner shell
21 and the large end positioned to the interior of inner shell 21.
Such apertures 29 will be seen along sole 24, heel 25 and
ankle-covering portions 27. Such apertures provide a mechanical
interlock between the inner and outer shells, as will hereafter be
apparent.
Outer shell 22 forms a complete boot and has a toe box 31, sole 32,
vamps 33, heel 34, ankle and leg encircling portions 35 and flaps
36, by which the outer shell 22 may be closed about the foot of the
wearer. Flaps 36 are shown as including eyelets 37, through which
the boot may be laced in the known manner. In order to aid in
closure of the outer shell about the boot of the wearer, an
intermediate section 38 of lesser thickness is provided between
flaps 36 and the main body of outer shell 22. Thinned sections 38
impart increased flexibility, so that the flaps can be more easily
bent over the instep of the foot as the boot is being laced.
As aforenoted, inner shell 21 is preferably first formed by
injection molding about a last or form (not shown). Outer shell 22
is thereafter formed, preferably by injection molding, about the
previously formed inner shell 21. Because many of the preferred
inner and outer shell materials do not readily form a chemical bond
therebetween, the apertures 29 have been provided, and as can be
seen from the sectional views of FIGS. 2 and 4, the material of the
outer shell flows into the apertures 29, thereby forming a
mechanical bond between the inner and outer shells. The mechanical
bond substantially eliminates relative movement between the inner
and outer shells to prevent abrasion and maintain proper
positioning between the two shells.
For greater comfort and improved fit, it is contemplated that a
liner formed of cloth, leather and/or spongy materials will be
inserted in the finished boots, but as such finishing materials
form no part of the instant invention, they have not been shown for
either type of boot.
The same inventive concept is incorporated in the cross-country
boot shown in FIGS. 5 through 11. A cross-country boot need not be
as high as a skate boot and thus normally does not extend above or
to the wearer's ankle bones. However, torque resistance in a
lateral direction is an important function of a cross-country boot,
so that the forward drive imparted by the skier will be transferred
without lost motion through the boot and binding to the ski. Edge
control is also an important factor in cross-country skiing,
whereby the lateral rigidity imparted by the construction of the
instant invention especially adapts itself for a cross-country
boot.
In a cross-country boot, an inner shell 41 and an outer shell 42
are provided. Materials suitable for the inner shell 41 are similar
to the materials described in connection with inner shell 21 of the
skate boot, and materials suitable for outer shell 42 are similar
to the materials described in connection with outer shell 22 of the
skate boot. Inner shell 41 has a toe portion 43 with a projecting
lip 44, a sole 45 and a heel 46. In the area where the foot flexes
forward of the ball, sole 45 is corrugated as indicated at 47. The
corrugations 47 provide a plurality of thinned sections, thereby
imparting considerable flexibility to the sole across its lateral
extent, to thereby allow, with an otherwise generally rigid
material, the substantial flexing of the sole required for
cross-country skiing, as is well known to those who partake of the
sport.
Outer shell 42 is provided with a toe box 51, a sole 52 which
underlies the boot and also surrounds projecting lip 44, vamps 53,
a heel 54, a back 55 and ankle-encircling portions 56 which
normally extend to a level below the ankle bones of the wearer.
Outer shell 42 is also provided with a flap 57 by which the boot
may be closed and latched about the foot of the wearer by means of
a suitable buckle 58. Also, a snow cuff 59 formed of any suitable
stretchable fabric or material may be stitched or otherwise secured
at the ankle opening for a close fit about the wearer's foot to
minimize the entry of snow into the boot.
The flexing portion of the boot in the area forward and above the
ball of the foot and above the sole is molded with an accordion
effect, as indicated at 61, in order to allow the boot to be flexed
the substantial degree required for a boot of this type. It has
been found preferable to mold the outer shell 42 in a position such
as is indicated in FIG. 5, with the heel raised from the horizontal
by the angle .theta.. An angle .theta. of about 221/2.degree. has
been found effective so that the boot can readily flex
221/2.degree. in either direction from the molded position to
provide flexing from the horizontal by an amount of 45.degree.. If
a greater total degree of flexibility is desired, the boot could be
molded at a greater angle to the horizontal. As the boot when
flexing will require a greater degree of accordion effect at points
most distant from the bend line along the sole, it can be seen from
FIGS. 6 and 7 that the accordion effect decreases toward the sole
and increases as the distance from the sole increases.
A cross-country ski boot will normally be provided with a heel 54,
as best seen in FIG. 11, and the heel may also have a slot 62 which
cooperates with a guide as part of the binding on the ski to aid in
alignment of the boot on the ski when the boot is in the lowered
position. In view of the depth of heel 54, it may be desirable or
necessary to insert a platform 63 in the heel so that the heel of
the foot is properly positioned within the boot. Platform 63 can be
of any suitable material and could be molded as part of the inner
shell 41, but this would unnecessarily complicate the molding
process. Platform 63 is not considered to be part of the present
invention.
As described in connection with the skate boot, it is likewise
desirable with respect to the cross-country boot to provide a
mechanical interlock between the inner and outer shells. In the
embodiment of FIGS. 5 through 11, projections 64 are molded as an
integral part of inner shell 41 when the inner shell is initially
molded. During the molding of outer shell 42 about inner shell 41,
projections 64 will extend through the outer shell, as best seen in
FIGS 8, 9 and 11, to thereby provide a mechanical interlock. A
mechanical interlock on opposite sides of the accordion portions 61
and the corrugations 47 is especially important in view of the
substantial sheer forces occurring between the inner and outer
shells during the considerable flexing of the boot during use.
Applicant's basic invention has been embodied in the prior
copending application, and a preferred embodiment has been
described therein as same relates to a ski boot of the type used
for alpine skiing. The principles of invention have been further
developed in the instant application, wherein there is disclosed
embodiments of athletic boots especially suitable as ice skate and
cross-country ski boots.
It will thus be seen that the objects set forth above, among those
made apparent from the preceding description, are efficiently
attained, and since certain changes may be made in the above
article without departing from the spirit and scope of the
invention, it is intended that all matter contained in the above
description and shown in the accompanying drawings shall be
interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended
to cover all of the generic and specific features of the invention
herein described, and all statements of the scope of the invention
which, as a matter of language, might be said to fall
therebetween.
* * * * *