Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02256932 1998-12-22
Sofe Connection for Piece of footwear
Field of the invention
The present invention relates to a piece of footwear that can be used for the
manufacture of shoes in general and more particularly for ice or roller
skates.
More particularly, it relates to the connection elements allowing connecting
the
boot to a blade holder, a roller support or a shoe sole.
Back4round of the invention
Traditional shoes, boots, ice skate or roller skate boots are manufactured for
decades in the same traditional manner. An insole is made according to well
known methods such as die cutting, molding, etc. The insole may then be
formed to better fit to the different cavities of the foot.
A last is then used to assemble the different components together. First, the
insole is temporarily attached to the last and any excess material may be
removed from the edge of the insole to enable a better fit. A boot upper is
placed over the last, suitable cement is applied and the bottom margin of the
upper is folded over the insole. Permanent attachment is also usually made
by tacking the folded portion to the insole. The adjustment of the upper to
the
last, the required stretching of the material before it is attached to the
insole
and the attachment operations are often difficult to perform and the final
result may directly depend on the worker's skills and experience.
Imperfections such as folds, cement stains, or uncovered areas are very
common. This traditional process is also difficult to automate. Manufacturers
are thus often dependant upon the availability of experienced workers, who
are not always available when needed at reasonable costs.
An outsole is usually attached to the bottom of the boot. In a shoe or boot,
the primary use of the outsole is to provide a contact surface to contact the
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CA 02256932 1998-12-22
ground. It also hides all imperfections due to the assembling process.
However, the consequences of these imperfections such as reduced life or
loosen material, etc, remain.
In the case of a skate, for instance an ice skate, the blade holder is then
attached to the boot out sole, usually with rivets. In the case of a roller
skate,
the roller support is normally riveted to the boot sole. Those rivets are
inserted manually, or semi automatically, and the assembling quality largely
depends on the operator skills. Imperfectly assembled rivets are very often
seen, in particular on low and medium price ice skates.
It is also very difficult to automate entirely the riveting operations. To
compensate the difficulties to automate and the related manpower costs, the
manufacturing of skates is more and more subject to be transferred in
countries having low manpower costs, but this manpower is often
inexperienced with these products and the quality may be affected.
The sole being normally a substantially flat surface without any line-up mark,
during the assembling process it may be difficult to locate the holder with
respect to the boot with a very high accuracy, causing for instance
misalignments or other similar problems.
Moreover, considering the forces and stresses encountered by ice skates in
use, the rivets are regularly subjected to shear stresses. On most skates,
rivets must sustain all forces transmitted from the foot and the boot to the
blade holder. A large amount of energy is lost during this transfer, namely
because rivets are not particularly efficient in shear. However, to get
optimal
performance and control, as much energy as possible must be transferred
from the boot to the blade.
Thus, as explained, traditional lasted boots, - due to their design and
manufacturing process, present many drawbacks. For instance, the process
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CA 02256932 1998-12-22
leads to the fact that each assembled product has a different aspect, a
different level of quality, etc. The force and/or energy transfer from the
boot
to the blade is not optimal.
In another aspect, traditional stitched ice skates were made almost entirely
of
leather. Typically, as described herein above, the construction of the skate
boot
was made by assembling pieces of leather material over a last. Those leather
pieces were connected to each other either by sewn stitches or by adhesives.
The resulting boot was flexible enough so that it would not impede the
movement of the foot in any particular direction, while offering a reasonable
level of ankle support. For the last few years, however, ice skate
manufacturers
have used different materials for manufacturing of skate boots in order to
provide some required characteristics. For example, skate boots that are now
currently available on the market use a combination of leather, nylon and
other
synthetic materials that are designed to offer an increased resistance to
flexing,
particularly in the ankle area. The enhanced rigidity of the skate boot in the
ankle area is important, particularly for professional players who, in terms
or
performance gains, derive clear benefits from skates that offer an increased
stability in the ankle region. However, it is often difficult to offer an
appropriate
balance between the rigidity requirements.
Thus, in ice hockey, it is essential for the player to have a skate which is
as
rigid as possible, especially in terms of resistance to supination and
pronation,
i.e. movement about a longitudinal axis of the foot. Such rigidity provides
the
player with direct control over the skate blade edges, which is essential to
controlled, balanced and powerful skating.
At the same time, the skate cannot be too rigid, particularly in terms of
dorsal
and plantar flexion, i.e. movement about a lateral axis, because the player
has
to be able to flex his ankle normally to maximize power and control.
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CA 02256932 1998-12-22
Also, since injury to the foot and ankle through impact is always a concern,
whether through impact from a hockey puck or via a deliberate or accidental
slash from a hockey stick, impact protection is highly desirable.
This leads to say that there is a need in the industry for developing a piece
of
footwear, a skate boot, or a shoe easier and cheaper to manufacture and
offering improved mechanical characteristics.
Objects and statement of the invention
It is thus an object of the invention to provide a piece of footwear, in
particular
a skate boot, providing improved comfort and performance.
It is another object of the invention to provide a piece of footwear, in
particular a skate boot, providing impraved quality, namely more stability
from
product to product during the manufacturing process.
It is another object of the invention to provide a piece of footwear, in
particular a skate boot, providing improved automatization possibilities for
the
manufacturing process.
It is another object of the invention to provide a piece of footwear, in
particular a skate boot, providing a wide range of design possibilities, in
using
a limited number of modified elements.
It is another object of the invention to provide a piece of footwear, in
particular a skate boot, offering possibilities to extend the life of the
skates
and enabling to maintain the high level of performance over a longer period.
It is another object of the invention to provide a piece of footwear, in
particular a skate boot, offering a good force transmission and/or strain
distribution.
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CA 02256932 1998-12-22
It is another object of the invention to provide a piece of footwear, in
particular a skate boot, offering ease of insertion and removal.
It is also an object of the invention to provide a skate which improves the
overall strength and rigidity of the skate boot, particularly in terms of
restricting supination and pronation, i.e. movement about a longitudinal axis.
Preferably, the invention restricts supination and pronation, but permits a
certain amount of dorsal and plantar flexion, i.e. movement about a lateral
axis.
It is a further object of the invention to provide improved impact protection.
As embodied and broadly described herein, the invention provides a piece of
footwear, in particular a skate boot, comprising:
a footwear frame for supporting at least portions of the bottom area of a
wearer's foot and having a sole portion
at least one connector, provided on said sole.
The traditional lasted boots and the "old fashioned" assembly process, with
its difficulties to automate, its unstable quality and other drawbacks may be
replaced by a more cost effective process, involving a more stable quality
and more possibilities for automatization. For instance, molding techniques
may be used to produce the footwear frame.
Advantageously, the piece of footwear comprises at least one connector,
extending outwardly from the sole or defined in the outer portion of the sole.
The number, shape and dimensions of the connectors may vary almost
infinitely from product to product. The materials may also vary. The
connectors are preferably made of the same material as the frame, and may
be made as a projection from the sole. In the case of a skate boot, this
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CA 02256932 1998-12-22
contributes to enhance the force transmission from the boot to the skating
member holder that connects to the boot connectors.
Preferably, the connector extends substantially along more than half or two
third of the total length of the sole portion. A long intersection between the
sole or the holder and the sole may provide an increased force transmission
and provides a better mechanical connection between the members.
Preferably, a front connector is provided in a front portion of the sole and a
rear connector is provided in a rear portion of the sole. Independent
connection points at the front and at the rear provides optimal connection. It
enables a good transmission of lateral forces.
Preferably, the front connector andlor the front connector have either at
least
one substantially transversal wall or at least one substantially transversal
slot
defining a first generally transversal plane. The male and female
arrangement is provided so that the male element may either be placed on
the sole or on the connecting element.
Advantageously, the first and second plane are not equally angled with
respect to a given common at rest plane on which the piece of footwear may
be placed in an at rest position. This arrangement may help to secure the
connecting element, for instance the holder, to the sole.
Advantageously, the piece of footwear further comprises at least one
substantially longitudinal wall or slot provided in said sole. To provide a
best
connection and to ensure as much force transfer as possible, in as much
direction as possible, the connection preferably considers the two main axis
of the sole, longitudinal and transversal. An almost infinite number of
combinations of these two axis may be provides, to provide connection
configuration of various shapes and profiles. -
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CA 02256932 1998-12-22
Preferably, in accordance with the invention, the footwear frame further
comprises an upper comprising lateral portions extending at least partially
along each side of a wearer's foot, a heel portion, extending substantially
along the wearer's heel, an ankle portion, extending at least partially along
the ankle portion of a wearer's foot, said lateral portions defining an
opening
for insertion of the wearer's foot.
As embodied and broadly described herein, the invention also provides a
skate comprising a piece of footwear as defined herein above, further
comprising a skating member holder having at least one connection portion
adapted for connection to said at least one connector, and a skating member,
connected to said holder on the opposite side of said connection portion. The
footwear frame and the connectors are preferably integral. The holder may
be a blade holder in which case the skate is an ice skate provided with a
blade runner connected to said holder, or the holder may be a wheel holder
in which case the skate is a roller skate provided with a set of wheels
connected to said holder.
The holder is advantageously provided with the other one of at least one
substantially transversal wall or slot for connection to the corresponding
other
element, wall or slot, of the sole portion.
As embodied and broadly described herein, the invention also provides
a shoe comprising a piece of footwear as defined herein above.
Other objects and features of the invention will become apparent by
reference to the following description and the drawings.
Brief description of the drawings
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CA 02256932 1998-12-22
A detailed description of the preferred embodiments of the present invention
is provided hereinbelow, by way of example only, with reference to the
accompanying drawings, in which:
Figure 1 is an exploded perspective view illustrating a skate boot according
to the invention;
Figure 2 is an exploded perspective view illustrating a variant of the skate
boot of figure 1;
Figure 3 is an exploded perspective view illustrating a further variant of the
skate boot of figure 1;
Figure 4 is an exploded perspective view illustrating a further variant of the
skate boot of figure 1;
Figure 5 is an exploded perspective view illustrating a skate boot and a blade
assembly before final assembly;
Figure 6 is an exploded perspective view illustrating a blade holder
integrated
to the frame;
Figure 7 is an exploded perspective view illustrating an a frame with an all
length connector;
Figures 8, 9 and 10 are respectively perspective, side elevational and
bottom views of a skate boot having a frame with a front connector and a rear
connector;
Figures 11 and 12 are respectively side elevational and rear fragmentary
views showing the connection between the boot and the blade holder of an
ice skate, before connection;
CA 02256932 1998-12-22
Figures 13 and 14 are respectively side elevational and rear fragmentary
views showing the connection between the boot and the blade holder of an
ice skate, after connection;
Figures 15 and 16 illustrate rear fragmentary views showing variants of the
connection between the boot and the blade holder of an ice skate, before
connection;
Figure 17 illustrates side elevational views showing the assembly axis
between the front and rear connectors and the blade holder before assembly;
Figure 18 illustrates the skate of figure 17 after assembly and an example of
a locking member used to lock the assembly;
Figure 19 illustrates an exploded perspective view of a skate boot and the
corresponding blade holder using an example of longitudinal type
connectors;
Figure 20 illustrates an exploded perspective view of a skate boot and the
corresponding blade holder using an example of transversal type connectors;
Figure 21 illustrates an exploded perspective view of a skate boot and the
corresponding blade holder using an example of a combined longitudinal and
lateral type of connectors, forming a series of V attached together;
Figure 22 illustrates an exploded perspective view of a skate boot and the
corresponding blade holder using an example of a combined longitudinal and
lateral type of connectors, forming opposed hemispherical connection bodies;
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CA 02256932 1998-12-22
Figure 23 illustrates an exploded perspective view of a skate boot and the
corresponding blade holder using an example of a combined longitudinal and
lateral type of connectors, forming opposed triangles;
Figure 24 illustrates an exploded perspective view of a skate boot and the
corresponding blade holder using an example of a combined longitudinal and
lateral type of connectors, forming cylindrical connection bodies;
Figure 25 illustrates a perspective view of a variant of a frame provided with
a
resilient portion;
Figure 26 illustrate a perspective view of another variant of a frame provided
with a resilient portion;
Figure 27 illustrates a view of the resilient portion from the plane x-x of
figure
26;
Figure 28 illustrates a side elevational view of an example of a boot
according to the invention;
Figure 29 illustrates an exploded perspective view of an example of a shoe
according to the invention;
Figure 30 illustrates an exploded perspective view of the boot of figure 28
before assembly;
In the drawings, preferred embodiments of the invention are illustrated by
way of examples. It is to be expressly understood that the description and
drawings are only for the purpose of illustration and are an aid for
understanding. They are not intended to be a definition of the limits of the
invention.
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CA 02256932 1998-12-22
Detailed description of preferred embodiments
The present invention provides a novel piece of footwear, in particular a
skate
boot construction that features a novel arrangement and a novel manufacturing
process. The described features can be used either on their own or combined
together in a skate boot or other type of footwear embodying the principles of
the present invention. Most preferably, however, these elements are used
together to offer the highest benefits.
As shown in particular in figures 1 and 2, the piece of footwear of the
invention comprises first a footwear frame. This footwear frame is
advantageously of monocoque construction, and made for example by
molding. This element is the "heart" of the boot. Its role may be considered
from two different angles. First, on the construction point of view, the frame
is
used to receive or attach most, or all the other elements of the boot. For
instance, in the embodiment illustrated in figure 1, the outer cover and the
toe
cap and tongue assembly are all attached to the frame. As will be described
later, the blade holder is also attached to the frame.
Second, considering the design, the frame is preferably used as the main
structural element of the boot. It provides support. Through the application,
the word support is used in reference to the concept of supporting the user's
foot. This concept is very important, namely in the embodiments related to
the skate boots. In fact, due to the presence of an equilibrium line (the
blade
runner) efficient skate boots must provide a lateral support as good as
possible. This is important to ensure the foot stability, to provide efficient
control, and for comfort. A longitudinal support is also wished, to provide an
efficient energy transfer from the foot to the blade. A boot with rigid walls
is
probably the most natural solution to provide longitudinal andJor lateral
support. But other arrangements are also possible.
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CA 02256932 1998-12-22
The skilled man in the art will understand that different degrees of support
may be required, depending on the embodiment and the nature of the
footwear; for instance, a hockey skate boot needs a high rigidity, for
instance
to provide very high lateral stability, essential to support a blade runner,
whereas a walking boot only requires a limited rigidity compared to the skate
boot, as it is not provided with a blade runner. Moreover, a walking boot is
subject to be worn for longer periods and thus requires appropriate comfort.
The frame can be made of a single material, for simplicity and economy. It
can also be made of two, three, four, or even more materials. A mufti-material
frame provides the advantages related to each material. For instance, the
frame can be provided with rigid areas, for example to offer a good support,
while other areas are made of flexible or resilient material, for example in
association with sensitive areas of the foot, to enhance comfort. The wall
thickness may also vary from place to place, for instance to provide
enhanced or reduced rigidity. All these features may be provided with well-
known molding techniques, such as mufti-injection molding or the like.
The frame configuration may follow an almost infinite number of patterns.
Many examples are shown in the annexed drawings. For instance, some
configurations may enclose most of the user's foot (such as the example
illustrated in figure 1 ), while other configurations may cover only a limited
area mainly concentrated in specific portions to provide support.
In the figure 1 example, the footwear frame is provided with a sole portion
and an upper comprising lateral portions extending at least partially along
each side of the foot, a heel portian, extending substantially along the
wearer's heel, an ankle portion, extending at least partially along the ankle
portion of a wearer's foot. The lateral portions define an opening for
insertion
of the wearer's foot. An upper connection portion extends downwardly and
forwardly from the rear top portion of the lateral ~ivalls, to the top lateral
walls
of the toe portion. This connection portion may be provided with eyelets.
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CA 02256932 1998-12-22
The frame is preferably of monocoque construction. It may be provided with
upper wings, extending upwardly from the rear of the ankle portion.
An outer cover, in one or more parts, is placed adjacent the footwear frame
and substantially adapted to the outer profile of the frame. In figure 1, the
cover is made of a single piece and its profile is substantially adapted to
the
outer contour of the frame. The cover is advantageously glued to the frame.
The frame may also be attached to the frame by any other mechanical or
chemical process.
The frame comprises a toe cap for substantially covering a wearer's toes. It
also comprises a tongue. The tongue is advantageously connected to the toe
cap. The resulting toe cap and tongue assembly may be manufactured as a
single element, for example by molding. It can also be made of two (or more)
elements connected together for instance with glue, or with any other
mechanical or chemical process.
The toe cap rigidity may vary considerably depending on the embodiment.
For instance, with skate boots, the toe cap is usually relatively hard, namely
to ensure protection, for instance against puck or hockey stick impacts. To
the contrary, walking shoes or sport shoes use a rather smooth toe cap, to
maximize comfort.
The toe cap is advantageously shaped complementary to the front portion of
the frame. In the example illustrated in figure 1, the toe cap is shaped to
cover the upper lateral and top portions of the toes region. The tongue
extends upwardly and rearwardly from the rear top portion of the toe cap.
The boot central aperture, provided for the insertion and removal of the foot,
is thus covered. In most footwear arrangements, the tongue is maintained
and the shoe attached with laces, going through a series of eyelets provided
on the upper portion of each lateral wall. Once the laces are loosed, the
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CA 02256932 1998-12-22
tongue may easily be pulled up, to facilitate the insertion or removal of the
foot.
Figure 2 illustrates a variant of the frame without upper wings.
Figure 3 illustrates a variant of the frame without eyelets. In such a design,
the upper cover may be provided with series of eyelets on each side thereof.
The portions provided with the eyelets extend from the frame, so that the
laces may be installed without interference with the frame.
Figure 4 illustrates a variant where the frontal portion or toe portion of the
frame is only connected to the rear portion via the sole, or bottom portion of
the frame. The upper connection portion connecting the rear upper and front
portions of the frame, as shown in figure 1, has been removed in the variant
of figure 4. This resulting variant may be used to provide different
mechanical
properties to the boot, for instance more flexibility, or reduced weight. The
outer cover may also be designed to provide the required properties. It may
for instance be made more rigid, to compensate the absence of the upper
connection portion, or flexible, if a flexible front portion is required.
The desired characteristics of the outer cover may be obtained in using
different materials andlor different wall thickness andlor using composites.
In the variant illustrated in figure 4, the eyelets are provided partly on the
outer cover (for the lower eyelets) and partly on the frame side portions (for
the upper eyeletsj.
Figure 5 illustrates the example of figure 1 before assembly with a blade
holder provided with a blade runner. These elements are well known in the
art. For instance, a blade holder as the one manufactured by Bauer Nike
hockey Inc. and sold under the name TUUK and the corresponding blade
runner may be used. Other assemblies may also be used. The blade older
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CA 02256932 1998-12-22
may be attached to the sole of the boot with rivets, as traditionally done in
the
ice skate industry. Other attachment types are also possible, as described
herein below.
Figure 6 illustrates an example provided with a blade holder advantageously
molded with the footwear frame. Such an embodiment provides many
advantages. For instance, a major assembly operation is no longer required,
that is to say the blade holder attachment operation. When done traditionally,
with rivets, this operation is very time consuming and also very critical. The
quality of the riveting operation may vary from skate to skate, leading to
quality or reliability problems. These drawbacks are thus avoided. Moreover,
the direct link created between the boot and the blade holder provides
enhanced energy transfer and support.
Figure 7 illustrates a variant of the piece of footwear provided with an
elongated connector, extending longitudinally below the sole. It may extend
on substantially all length of the sole as shown in figure 7, or on a shorter
portion.
Figures 8 to 10 illustrate a variant with a front connector and a rear
connector.
Figures 11 to 18 illustrate examples of the connection between the
connectors and the blade holder. Figures 11 and 12 illustrate a skate boot
and a blade holder before connection, and figures 13 and 14 illustrate these
elements after connection. The connection is advantageously provided with a
male/female arrangement. The male may be provided either on the boot (as
shown in figures 12, 14 and 15) or on the holder (as shown in figure 16).
For a better connection, the connector and the blade holder are
advantageously provided with indentations. For instance, as shown in figure
12, corresponding male and female indentations, preferably transversally
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CA 02256932 1998-12-22
oriented, that interpenetrate each other, may contribute to secure the
assembly between the two elements. Moreover, lateral efforts, torque forces
and even the longitudinal forces are better transmitted from the boot to the
holder and then to the blade runner. The indentations may be arranged as a
clic-in arrangement. The female element is thus designed so that its lateral
walls slightly moves outwardly mainly due to the elasticity of the element.
Once the connection is established, the male element is "locked in" the
female element. The number, size and orientation of the indentations may
follow an almost unlimited number of patterns. For instance, in figure 12 and
14, there are two substantially transversal indentations on each inner
portions of the lateral walls. In figure 15, the upper indentation is
substantially
vertical. The combination of angularly spaced indentations may provide
increased performance, for instance with regard to the force transmission.
Variants with removable blade holder may be provided. The assembly is then
preferably made without permanent assembly element or compound such as
glue or the like. The elasticity of the female element is thus sufficient to
allow
the disassembly of the two elements. Such a variant is particularly
advantageous for the product categories sold as reparable. If the blade
holder is damaged, it can be replaced. The user does not have to buy a new
pair of skates. This may be of particular interest for the high-end (more
expensive) skates. This may also be advantageous for the custom made
skates, because the boots may be used with an almost unlimited number of
holders. A special tool may be designed to facilitate the removal operation.
Variants with permanently attached holder may also be provided. A
permanent fixation element or compound may then be used. The elasticity of
the female element may be lower than with a variant with a detachable
holder. Permanent attachment may be desired for some products less
subject to damage.
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CA 02256932 1998-12-22
Figures 17 and 18 illustrate an example of connection between a boot having
a front male connector and a rear male connector and a corresponding blade
holder. The assembly axis is preferably established in considering the main
forces and stresses of the skate when used in normal condition. For instance,
the assembly axis is advantageously oriented to be as different as possible
from the main forces or stresses generated at the bootlframe interface. This
is highly desirable to minimize involuntary disassembly risks. In this
example,
both connectors are adapted for substantially simultaneously assembly.
Locking elements are also preferably used to avoid involuntary disassembly
risks. In the illustrated example, a locking key or pin is inserted at the
assembly interface, for example in front of the front connector. In this
example, the locking key fills a gap between the connector and the holder
that is located at least partially outside the assembly/disassembly path.
Thus,
the holder can not be removed without removing first the locking key. In this
example the key is inserted from the top of the sole, following a locking key
axis that is angularly spaced from the assembly axis. Other types of locking
elements andlor other location for insertion may be provided. For instance,
one or more (for example a front and a rear) locking pins could be inserted
from the lateral portions of the holder. Rivets, screws, pins, or any other
type
of locking elements may be used.
Apart from the connection portion, the blade holder as well as the blade
runner, may be of traditional types, for instance such as the above mentioned
TUUK blade arrangement.
Figures 19 to 24 illustrate variants of boots provided with examples of
different types of connectors. The boot of figure 19 is provided with
longitudinal ribs. In this example, two spaced apart ribs at the front and two
spaced apart ribs at the rear are provided. The number, dimensions and
position of the ribs may vary in other examples. The holder is provided with
corresponding slots. The longitudinal arrangement of the ribs/slots provides
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CA 02256932 1998-12-22
an efficient lateral support. The lateral forces and lateral efforts are thus
efficiently transmitted from the boot to the holder. Efforts oriented in other
directions are also transmitted, but not as efficiently as the lateral ones.
Other
configurations provide better transmission for other types of forces. For
instance, the variant illustrated in figure 20 is particularly efficient for
the
longitudinal forces.
It may be advantageous to provide optimal force transmission and support in
as many orientations as possible to optimize the characteristics of the skate.
Thus, it may be desired to use other connector configurations, for example
configurations offering good longitudinal and lateral behaviors. Figure 21
illustrates an example provided with substantially longitudinally aligned V-
shaped ribs. Figure 22 shows spaced apart opposite and symmetrical curved
portions. Figure 23 shows pairs of triangular ribs disposed face to face with
the head of the triangles interfacing each other. Figure 24 shows tubular or
cylindrical ribs: four elements forming a front connector and two others
forming a rear connector.
In all these previous examples, the number, dimensions, orientations, etc of
the different elements may vary almost infinitely. Combinations of the
different types illustrated andlor other types result in an infinite number of
possibilities. In the illustrated examples the male element is provided on the
boot and the slots on the holder. This confguration may be reversed. Also, a
single skate may comprise a combination of male and female connectors on
the boot, with a corresponding female and male arrangement on the holder.
Figures 25 to 27 illustrate a skate boot having a resilient portion. In the
variant shown in figure 25, the resilient portion is in the form of a semi-
circular band extending upwardly from the ankle portion of the boot and
extending longitudinally from a first lacing edge to the second lacing edge.
In
the illustrated embodiment, the band height substantially corresponds to the
required length to place three eyelets. The band height may of course vary in
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CA 02256932 1998-12-22
other variants to be smaller or greater than in this example. The longitudinal
or radial length may also considerably vary from one example to the other.
For instance, the band may be interrupted in the rear portion and replaced by
a less resilient portion or zone. The band may also be ending adjacent the
eyelets so that the latter are outside the band, as shown in figure 25. In
such
a case, a substantially rigid eyelet band is provided on each side of the
resilient portion and covers a surface slightly larger than the eyelets and
long
enough to allow their spaced apart alignment along the lateral edges. The
eyelet band may be advantageous to avoid any undesirable resilient action
interfering with the eyelets.
A cut-out portion is advantageously provided between the bottom of the
eyelet band and the front upper portion of the ankle region. This cut-out
portion is advantageously V-shaped with the open end of the V being
adjacent the edge of the wall, and the sharp end facing substantially towards
the ankle.
The resilient portion is provided to allow a certain amount of flexion
movement in the plantar direction. The alternating front to rear movement of
the wearer's legs and feet is considerably facilitated if the lower portion of
the
leg is allowed to flex forwardly. Thus, when the knee and the lower leg
portion are projected in the forward direction, the boot resilient portion is
placed under tension. The resilient characteristics allow the eyelet bands to
pivot forwardly, following the f3 angle as show in figure 25 (the illustrated
angle is enlarged for the purpose of illustration). In most cases, the real
angle
is rather small and may even be difficult to see for the user trying to pull
with
his hand the upper eyelet to cause the pivoting action.
The resilient portion may be made with any type of resilient material, for
instance of elastomeric type, or the like.
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CA 02256932 1998-12-22
All these characteristics contribute to provide a skate boot having enhanced
mechanical properties. For instance, the tongue has more freedom to move
longitudinally. Skaters may thus optimize their performances. This also
provides enhanced comfort.
Figure 26 illustrates a variant of a skate boot provided with a resilient
portion.
In this example, the resilient band is placed over a rigid portion. The rigid
portion extends upwardly from the heel portion to the top of the ankle
portion.
The upper region is provided with substantially vertical and substantially
parallel slots extending to the top edge of the boot and providing openings at
this top edge portion. The openings and the slots are advantageously filled-
up with elongated teeth protruding from the resilient band. Such an
arrangement may be provided for instance by well-known over-molding
techniques. The opened slots provide flexibility to the top portion of the
boot
in allowing the material between the slots to slightly bent. The teeth provide
only limited retention force due to their elasticity. Thus, the resilient
portion
may flex forward andlor rearward. The flex movement is mainly caused by
the forward and aft movement of the lower leg portion of the wearer.
The example illustrated in figure 26 further comprises a substantially rigid
heel portion and a substantially semi-rigid portion extending longitudinally
along the lacing edges. These different portions of the boot all have
different
mechanical properties one relative to the other.
Figure 27 illustrates a view of the resilient portion from the plane x-x of
figure
26.
Figures 28 to 30 illustrate another embodiment of the invention in which the
boot is used as a walking boot or shoe. In figure 30, a footwear frame is used
to provide the main body of the shoe. In most aspects, the frame is similar to
the one described in the previous embodiment for a skate boot. However, the
front and rear connectors are used to provide a front and a rear walking
CA 02256932 1998-12-22
surfaces. For this reason, the mechanical characteristics of the connectors
are preferably adapted to provide the usual characteristics of a shoe sole.
They may therefore be made of a different material than the frame.
An optional outer sole may be provided as shown in figure 28. Front and/or
rear connection apertures may be provided on the sole as illustrated in figure
30. The connectors may thus protrude through the sole and form a contacting
surface (see figure 28). The connectors and the sole could also be arranged
so that the connectors do not protrude from the sole. In such a variant, they
are only provided to ensure the connection between the two elements.
Figure 29 shows a variant with a smaller frame provided with an outer cover,
forming a shoe. The front and rear connectors are directly used to provide
walking surfaces.
The foregoing description clearly establishes that the objects of the
invention
are achieved.
The above description of preferred embodiments should not be interpreted in
a limiting manner since other variations, modifications and refinements are
possible within the spirit and scope of the present invention. The scope of
the
invention is defined in the appended claims and their equivalents.
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