U.S. patent application number 10/418526 was filed with the patent office on 2004-10-21 for swim fin with fabric foot pocket.
Invention is credited to Graham, Richard W..
Application Number | 20040209534 10/418526 |
Document ID | / |
Family ID | 33159126 |
Filed Date | 2004-10-21 |
United States Patent
Application |
20040209534 |
Kind Code |
A1 |
Graham, Richard W. |
October 21, 2004 |
Swim fin with fabric foot pocket
Abstract
A swim fin comprises a symmetrical fin blade. The symmetrical
fin blade has a symmetrical foot pocket receiving portion, a tip
portion, a blade deck, and side ribs extending from the symmetrical
foot pocket receiving portion to the tip portion along side
portions of the blade deck. The symmetrical foot pocket receiving
portion has a support portion extending generally parallel to the
blade deck. A symmetrical fabric foot pocket is joined to an upper
surface of the symmetrical fin blade at the symmetrical foot pocket
receiving portion. A symmetrical sole is joined to a lower surface
of the symmetrical fin blade at the symmetrical foot pocket
receiving portion. The symmetrical sole has a base portion
extending generally parallel to the blade deck.
Inventors: |
Graham, Richard W.; (Laguna
Beach, CA) |
Correspondence
Address: |
KNOBBE MARTENS OLSON & BEAR LLP
2040 MAIN STREET
FOURTEENTH FLOOR
IRVINE
CA
92614
US
|
Family ID: |
33159126 |
Appl. No.: |
10/418526 |
Filed: |
April 17, 2003 |
Current U.S.
Class: |
441/64 |
Current CPC
Class: |
A63B 31/11 20130101 |
Class at
Publication: |
441/064 |
International
Class: |
A63B 031/08 |
Claims
What is claimed is:
1. A swim fin comprising a symmetrical fin blade having a foot
pocket receiving portion; and a fabric foot pocket being joined to
an upper surface of the symmetrical fin blade at the foot pocket
receiving portion.
2. The swim fin of claim 1, wherein the foot pocket receiving
portion and the fabric foot pocket are symmetrical.
3. The swim fin of claim 2, additionally comprising a sole being
joined to a lower surface of the fin blade at the foot pocket
receiving portion, wherein the sole is symmetrical.
4. The swim fin of claim 1, wherein the symmetrical fin blade
additionally comprises a tip portion, a blade deck, and side ribs
extending from the foot pocket receiving portion to the tip portion
along side portions of the blade deck, and the foot pocket
receiving portion has a support portion extending generally
parallel to the blade deck.
5. The swim fin of claim 1, wherein the symmetrical fin blade
additionally comprises a tip portion, a blade deck, and side ribs
extending from the foot pocket receiving portion to the tip portion
along side portions of the blade deck, and the symmetrical fin
blade has fillets along intersections of the side ribs and the
blade deck.
6. The swim fin of claim 1, wherein the symmetrical fin blade
additionally comprises a tip portion, a blade deck, and side ribs
extending from the foot pocket receiving portion to the tip portion
along side portions of the blade deck, and the symmetrical fin
blade has a plurality of grooves on upper and lower surfaces of the
blade deck extending from the foot pocket receiving portion to the
tip portion.
7. The swim fin of claim 1, additionally comprising a sole being
joined to a lower surface of the symmetrical fin blade at the foot
pocket receiving portion, wherein the fin blade additionally
comprises a tip portion, a blade deck, and side ribs extending from
the foot pocket receiving portion to the tip portion along side
portions of the blade deck, and wherein the sole has a base portion
extending generally parallel to the blade deck.
8. The swim fin of claim 1, wherein the fabric foot pocket has an
upper portion and a lower portion, and the upper portion has a
first stretchable fabric layer, a second less-stretchable fabric
layer disposed over at least a portion of an upper surface of the
first stretchable fabric layer, and a heel strap portion with a
strap keeper loop and a buckle that has a double bar
configuration.
9. The swim fin of claim 1, wherein the fabric foot pocket has an
upper portion and a lower portion, and the lower portion extends
generally parallel to the upper portion.
10. The swim fin of claim 1, wherein the fabric foot pocket has an
upper portion and a lower portion, the lower portion has a
stretchable fabric bottom layer defining multiple drain holes, the
multiple drain holes include a primary drain hole and a series of
smaller secondary drain holes, and the series of smaller secondary
drain holes include drain holes being defined such that the series
of smaller secondary drain holes extends further toward a toe
region and side portions of the stretchable fabric bottom layer
than the primary drain hole extends.
11. The swim fin of claim 10, additionally comprising a sole being
joined to a lower surface of the symmetrical fin blade at the foot
pocket receiving portion, wherein the sole and the symmetrical fin
blade define multiple drain holes generally corresponding to the
multiple drain holes defined in the stretchable fabric bottom layer
of the lower portion of the fabric foot pocket.
12. A swim fin comprising a fin blade having a symmetrical foot
pocket receiving portion; and a symmetrical fabric foot pocket
being joined to an upper surface of the fin blade at the
symmetrical foot pocket receiving portion.
13. The swim fin of claim 12, wherein the fin blade is
symmetrical.
14. The swim fin of claim 12, additionally comprising a sole being
joined to a lower surface of the fin blade at the symmetrical foot
pocket receiving portion, wherein the sole is symmetrical.
15. The swim fin of claim 12, wherein the fin blade additionally
comprises a tip portion, a blade deck, and side ribs extending from
the symmetrical foot pocket receiving portion to the tip portion
along side portions of the blade deck, and the symmetrical foot
pocket receiving portion has a support portion extending generally
parallel to the blade deck.
16. The swim fin of claim 12, wherein the fin blade additionally
comprises a tip portion, a blade deck, and side ribs extending from
the symmetrical foot pocket receiving portion to the tip portion
along side portions of the blade deck, and the fin blade has
fillets along intersections of the side ribs and the blade
deck.
17. The swim fin of claim 12, wherein the fin blade additionally
comprises a tip portion, a blade deck, and side ribs extending from
the symmetrical foot pocket receiving portion to the tip portion
along side portions of the blade deck, and the fin blade has a
plurality of grooves on upper and lower surfaces of the blade deck
extending from the symmetrical foot pocket receiving portion to the
tip portion.
18. The swim fin of claim 12, additionally comprising a sole being
joined to a lower surface of the fin blade at the symmetrical foot
pocket receiving portion, wherein the fin blade additionally
comprises a tip portion, a blade deck, and side ribs extending from
the symmetrical foot pocket receiving portion to the tip portion
along side portions of the blade deck, and wherein the sole has a
base portion extending generally parallel to the blade deck.
19. The swim fin of claim 12, wherein the symmetrical fabric foot
pocket has an upper portion and a lower portion, and the upper
portion has a first stretchable fabric layer, a second
less-stretchable fabric layer disposed over at least a portion of
an upper surface of the first stretchable fabric layer, and a heel
strap portion with a strap keeper loop and a buckle that has a
double bar configuration.
20. The swim fin of claim 12, wherein the symmetrical fabric foot
pocket has an upper portion and a lower portion, and the lower
portion extends generally parallel to the upper portion.
21. The swim fin of claim 12, wherein the symmetrical fabric foot
pocket has an upper portion and a lower portion, the lower portion
has a stretchable fabric bottom layer defining multiple drain
holes, the multiple drain holes include a primary drain hole and a
series of smaller secondary drain holes, and the series of smaller
secondary drain holes include drain holes being defined such that
the series of smaller secondary drain holes extends further toward
a toe region and side portions of the stretchable fabric bottom
layer than the primary drain hole extends.
22. The swim fin of claim 21, additionally comprising a sole being
joined to a lower surface of the fin blade at the symmetrical foot
pocket receiving portion, wherein the sole and the fin blade define
multiple drain holes generally corresponding to the multiple drain
holes defined in the stretchable fabric bottom layer of the lower
portion of the symmetrical fabric foot pocket.
23. A swim fin comprising a fin blade having a foot pocket
receiving portion, a tip portion, a blade deck, and side ribs
extending from the foot pocket receiving portion to the tip portion
along side portions of the blade deck, the foot pocket receiving
portion having a support portion extending generally parallel to
the blade deck; and a fabric foot pocket being joined to an upper
surface of the fin blade at the foot pocket receiving portion.
24. The swim fin of claim 23, wherein the fin blade is
symmetrical.
25. The swim fin of claim 23, wherein the foot pocket receiving
portion and the fabric foot pocket are symmetrical.
26. The swim fin of claim 25, additionally comprising a sole being
joined to a lower surface of the fin blade at the symmetrical foot
pocket receiving portion, wherein the sole is symmetrical.
27. The swim fin of claim 23, wherein the fin blade has fillets
along intersections of the side ribs and the blade deck.
28. The swim fin of claim 23, wherein the fin blade has a plurality
of grooves on upper and lower surfaces of the blade deck extending
from the foot pocket receiving portion to the tip portion.
29. The swim fin of claim 23, additionally comprising a sole being
joined to a lower surface of the fin blade at the foot pocket
receiving portion, wherein the sole has a base portion extending
generally parallel to the blade deck.
30. The swim fin of claim 23, wherein the fabric foot pocket has an
upper portion and a lower portion, and the upper portion has a
first stretchable fabric layer, a second less-stretchable fabric
layer disposed over at least a portion of an upper surface of the
first stretchable fabric layer, and a heel strap portion with a
strap keeper loop and a buckle that has a double bar
configuration.
31. The swim fin of claim 23, wherein the fabric foot pocket has an
upper portion and a lower portion, and the lower portion extends
generally parallel to the upper portion.
32. The swim fin of claim 23, wherein the fabric foot pocket has an
upper portion and a lower portion, the lower portion has a
stretchable fabric bottom layer defining multiple drain holes, the
multiple drain holes include a primary drain hole and a series of
smaller secondary drain holes, and the series of smaller secondary
drain holes include drain holes being defined such that the series
of smaller secondary drain holes extends further toward a toe
region and side portions of the stretchable fabric bottom layer
than the primary drain hole extends.
33. The swim fin of claim 32, additionally comprising a sole being
joined to a lower surface of the fin blade at the foot pocket
receiving portion, wherein the sole and the fin blade define
multiple drain holes generally corresponding to the multiple drain
holes defined in the stretchable fabric bottom layer of the lower
portion of the fabric foot pocket.
34. A swim fin comprising a fin blade having a foot pocket
receiving portion, a tip portion, a blade deck, and side ribs
extending from the foot pocket receiving portion to the tip portion
along side portions of the blade deck, the fin blade having fillets
along intersections of the side ribs and the blade deck; and a
fabric foot pocket being joined to an upper surface of the fin
blade at the foot pocket receiving portion.
35. A swim fin comprising, a fin blade having a foot pocket
receiving portion, a tip portion, a blade deck, and side ribs
extending from the foot pocket receiving portion to the tip portion
along side portions of the blade deck, the fin blade having a
plurality of grooves on upper and lower surfaces of the blade deck
extending from the foot pocket receiving portion to the tip
portion; and a fabric foot pocket being joined to an upper surface
of the fin blade at the foot pocket receiving portion.
36. A swim fin comprising a fin blade having a foot pocket
receiving portion; and a fabric foot pocket being joined to an
upper surface of the fin blade at the foot pocket receiving
portion, the fabric foot pocket having an upper portion and a lower
portion, the upper portion having a first stretchable fabric layer,
a second less-stretchable fabric layer disposed over at least a
portion of an upper surface of the first stretchable fabric layer,
and a heel strap portion with a buckle having a double bar
configuration.
37. A swim fin comprising a fin blade having a foot pocket
receiving portion; and a fabric foot pocket being joined to an
upper surface of the fin blade at the foot pocket receiving
portion, the fabric foot pocket having an upper portion and a lower
portion, the upper portion having a first stretchable fabric layer,
a second less-stretchable fabric layer disposed over at least a
portion of an upper surface of the first stretchable fabric layer,
and a heel strap portion with a strap keeper loop.
38. A swim fin comprising a fin blade having a foot pocket
receiving portion; and a, fabric foot pocket being joined to an
upper surface of the fin blade at the foot pocket receiving
portion, the fabric foot pocket having an upper portion and a lower
portion, the lower portion extending generally parallel to the
upper portion.
39. A swim fin comprising a fin blade having a foot pocket
receiving portion; and a fabric foot pocket being joined to an
upper surface of the fin blade at the foot pocket receiving
portion, the fabric foot pocket having an upper portion and a lower
portion, the lower portion having a stretchable fabric bottom layer
defining multiple drain holes, the multiple drain holes including a
primary drain hole and a series of smaller secondary drain holes,
the series of smaller secondary drain holes including drain holes
being defined such that the series of smaller secondary drain holes
extends further toward a toe region and side portions of the
stretchable fabric bottom layer than the primary drain hole
extends.
40. A swim fin comprising a fin blade having a foot pocket
receiving portion, a tip portion, a blade deck, and side ribs
extending from the foot pocket receiving portion to the tip portion
along side portions of the blade deck; a fabric foot pocket being
joined to an upper surface of the fin blade at the foot pocket
receiving portion; and a sole being joined to a lower surface of
the fin blade at the foot pocket receiving portion, the sole having
a base portion extending generally parallel to the blade deck.
41. A swim fin comprising a symmetrical fin blade having a
symmetrical foot pocket receiving portion, a tip portion, a blade
deck, and side ribs extending from the symmetrical foot pocket
receiving portion to the tip portion along side portions of the
blade deck, the symmetrical foot pocket receiving portion having a
support portion extending generally parallel to the blade deck, the
symmetrical fin blade having fillets along intersections of the
side ribs and the blade deck, the symmetrical fin blade having a
plurality of grooves on upper and lower surfaces of the blade deck
extending from the symmetrical foot pocket receiving portion to the
tip portion; a symmetrical fabric foot pocket being joined to an
upper surface of the symmetrical fin blade at the symmetrical foot
pocket receiving portion, the symmetrical fabric foot pocket having
an upper portion and a lower portion, the upper portion having a
first stretchable fabric layer, a second less-stretchable fabric
layer disposed over at least a portion of an upper surface of the
first stretchable fabric layer, and a heel strap portion with a
strap keeper loop and a buckle having a double bar configuration,
the lower portion extending generally parallel to the upper portion
and having a stretchable fabric bottom layer defining multiple
drain holes, the multiple drain holes including a primary drain
hole and a series of smaller secondary drain holes, the series of
smaller secondary drain holes including drain holes being defined
such that the series of smaller secondary drain holes extends
further toward a toe region and side portions of the stretchable
fabric bottom layer than the primary drain hole extends; and a
symmetrical sole being joined to a lower surface of the symmetrical
fin blade at the symmetrical foot pocket receiving portion, the
symmetrical sole having a base portion extending generally parallel
to the blade deck, the symmetrical sole and the symmetrical fin
blade defining multiple drain holes generally corresponding to the
multiple drain holes defined in the stretchable fabric bottom layer
of the lower portion of the symmetrical fabric foot pocket.
42. A method of making a swim fin comprising the steps of: forming
a fin blade having a symmetrical foot pocket receiving portion, a
tip portion, a blade deck, and side ribs extending from the
symmetrical foot pocket receiving portion to the tip portion along
side portions of the blade deck; forming a symmetrical fabric foot
pocket having an upper portion and a lower portion, the upper
portion having a first stretchable fabric layer, a second
less-stretchable fabric layer disposed over at least a portion of
an upper surface of the first stretchable fabric layer, and a heel
strap portion, the lower portion extending generally parallel to
the upper portion and having a stretchable fabric bottom layer; and
joining the symmetrical fabric foot pocket to an upper surface of
the fin blade at the symmetrical foot pocket receiving portion.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates generally to swim fins. More
particularly, the present invention relates to a swim fin with a
fabric foot pocket.
[0003] 2. Description of the Related Art
[0004] Swim fins are used in a variety of water sports and
recreational activities, as well as in many professional endeavors.
A swim fin may be worn on a user's foot while swimming to generate
propulsive forces that are greater than the propulsive forces that
can be generated without a swim fin. The swim fin allows the user
to swim faster and have greater control over the user's movement in
the water. Accordingly, swim fins are popular with many athletes
and professionals.
[0005] Some swim fins are molded from plastic or rubber material.
Some foot holding elements of swim fins are also formed of molded
plastic or rubber material. Some of these foot holding elements are
generally uncomfortable for a user. The foot holding elements may
fit imperfectly or irritate the user's foot after extended use.
[0006] Additionally, some fins are formed with asymmetrical blades
or asymmetrical foot holding elements. Some fins are also formed
with foot holding elements that are angled relative to portions of
the fin blade. Some of these fins may generate unwanted forces on
the user's feet, ankles and knees as the user swims. Additionally,
some of these fins are expensive to produce.
[0007] Additionally, other features of traditional swim fins have
inherent inefficiencies in their construction that reduce
propulsive forces and create drag on the fin.
SUMMARY OF THE INVENTION
[0008] Features of a preferred embodiment of the present invention
improve upon conventional swim fins with the use of a fabric foot
pocket and other improved fin features. Features of a preferred
embodiment of the present invention maximize propulsive forces,
minimize injury to the user and reduce manufacturing and production
costs of swim fins. Some of the applications and configurations of
the improved swim fin will be discussed below. It should be noted
that the following discussion relates to several distinct features
and not all of the features need to be present in any single
embodiment of the present invention. Thus, some of the features may
be used with other features in some applications while other
applications will only reflect one of the features. Moreover, the
features, aspects and advantages of the invention, as recited in
the appended claims, can be applied in still other configurations
within the scope of the invention, which will become apparent to
those of ordinary skill in the art.
[0009] Accordingly, in one embodiment of the invention, a swim fin
comprises a symmetrical fin blade having a foot pocket receiving
portion. A fabric foot pocket is joined to an upper surface of the
symmetrical fin blade at the foot pocket receiving portion.
[0010] In yet another embodiment, a swim fin comprises a fin blade
having a symmetrical foot pocket receiving portion. A symmetrical
fabric foot pocket is joined to an upper surface of the fin blade
at the symmetrical foot pocket receiving portion.
[0011] In still another embodiment, a swim fin comprises a fin
blade having a foot pocket receiving portion, a tip portion, a
blade deck, and side ribs extending from the foot pocket receiving
portion to the tip portion along side portions of the blade deck.
The foot pocket receiving portion has a support portion extending
generally parallel to the blade deck. A fabric foot pocket is
joined to an upper surface of the fin blade at the foot pocket
receiving portion.
[0012] A further embodiment involves a swim fin comprising a fin
blade having a foot pocket receiving portion, a tip portion, a
blade deck, and side ribs extending from the foot pocket receiving
portion to the tip portion along side portions of the blade deck.
The fin blade has fillets along intersections of the side ribs and
the blade deck. A fabric foot pocket is joined to an upper surface
of the fin blade at the foot pocket receiving portion.
[0013] According to another embodiment, a swim fin comprises a fin
blade having a foot pocket receiving portion, a tip portion, a
blade deck, and side ribs extending from the foot pocket receiving
portion to the tip portion along side portions of the blade deck.
The fin blade has a plurality of grooves on upper and lower
surfaces of the blade deck extending from the foot pocket receiving
portion to the tip portion. A fabric foot pocket is joined to an
upper surface of the fin blade at the foot pocket receiving
portion.
[0014] In another embodiment, a swim fin comprises a fin blade
having a foot pocket receiving portion. A fabric foot pocket is
joined to an upper surface of the fin blade at the foot pocket
receiving portion. The fabric foot pocket has an upper portion and
a lower portion. The upper portion has a first stretchable fabric
layer, a second less-stretchable fabric layer disposed over at
least a portion of an upper surface of the first stretchable fabric
layer, and a heel strap portion with a buckle having a double bar
configuration.
[0015] In still another embodiment, a swim fin comprises a fin
blade having a foot pocket receiving portion. A fabric foot pocket
is joined to an upper surface of the fin blade at the foot pocket
receiving portion. The fabric foot pocket has an upper portion and
a lower portion. The upper portion has a first stretchable fabric
layer, a second less-stretchable fabric layer disposed over at
least a portion of an upper surface of the first stretchable fabric
layer, and a heel strap portion with a strap keeper loop.
[0016] In a further embodiment, a swim fin comprises a fin blade
having a foot pocket receiving portion. A fabric foot pocket is
joined to an upper surface of the fin blade at the foot pocket
receiving portion. The fabric foot pocket has an upper portion and
a lower portion. The lower portion extends generally parallel to
the upper portion.
[0017] According to another embodiment, a swim fin comprises a fin
blade having a foot pocket receiving portion. A fabric foot pocket
is joined to an upper surface of the fin blade at the foot pocket
receiving portion. The fabric foot pocket has an upper portion and
a lower portion. The lower portion has a stretchable fabric bottom
layer defining multiple drain holes. The multiple drain holes
include a primary drain hole and a series of smaller secondary
drain holes. The series of smaller secondary drain holes include
drain holes being defined such that the series of smaller secondary
drain holes extends further toward a toe region and side portions
of the stretchable fabric bottom layer than the primary drain hole
extends.
[0018] In yet another embodiment, a swim fin comprises a fin blade
having a foot pocket receiving portion, a tip portion, a blade
deck, and side ribs extending from the foot pocket receiving
portion to the tip portion along side portions of the blade deck. A
fabric foot pocket is joined to an upper surface of the fin blade
at the foot pocket receiving portion. A sole is joined to a lower
surface of the fin blade at the foot pocket receiving portion. The
sole has a base portion extending generally parallel to the blade
deck.
[0019] In another embodiment, a swim fin comprises a symmetrical
fin blade. The symmetrical fin blade has a symmetrical foot pocket
receiving portion, a tip portion, a blade deck, and side ribs
extending from the symmetrical foot pocket receiving portion to the
tip portion along side portions of the blade deck. The symmetrical
foot pocket receiving portion has a support portion extending
generally parallel to the blade deck. The symmetrical fin blade has
fillets along intersections of the side ribs and the blade deck.
The symmetrical fin blade has a plurality of grooves on upper and
lower surfaces of the blade deck extending from the symmetrical
foot pocket receiving portion to the tip portion. A symmetrical
fabric foot pocket is joined to an upper surface of the symmetrical
fin blade at the symmetrical foot-pocket receiving portion. The
symmetrical fabric foot pocket has an upper portion and a lower
portion. The upper portion has a first stretchable fabric layer, a
second less-stretchable fabric layer disposed over at least a
portion of an upper surface of the first stretchable fabric layer,
and a heel strap portion with a strap keeper loop and a buckle
having a double bar configuration. The lower portion extends
generally parallel to the upper portion and has a stretchable
fabric bottom layer defining multiple drain holes. The multiple
drain holes include a primary drain hole and a series of smaller
secondary drain holes. The series of smaller secondary drain holes
include drain holes defined such that the series of smaller
secondary drain holes extends further toward a toe region and side
portions of the stretchable fabric bottom layer than the primary
drain hole extends. A symmetrical sole is joined to a lower surface
of the symmetrical fin blade at the symmetrical foot pocket
receiving portion. The symmetrical sole has a base portion
extending generally parallel to the blade deck. The symmetrical
sole and the symmetrical fin blade define multiple drain holes
generally corresponding to the multiple drain holes defined in the
stretchable fabric bottom layer of the lower portion of the
symmetrical fabric foot pocket.
[0020] According to another embodiment, a method of making a swim
fin comprises the steps of forming a fin blade having a symmetrical
foot pocket receiving portion, a tip portion, a blade deck, and
side ribs extending from the symmetrical foot pocket receiving
portion to the tip portion along side portions of the blade deck.
Forming a symmetrical fabric foot pocket having an upper portion
and a lower portion. The upper portion has a first stretchable
fabric layer, a second less-stretchable fabric layer disposed over
at least a portion of an upper surface of the first stretchable
fabric layer, and a heel strap portion. The lower portion extends
generally parallel to the upper portion and has a stretchable
fabric bottom layer. Joining the symmetrical fabric foot pocket to
an upper surface of the fin blade at the symmetrical foot pocket
receiving portion.
[0021] In another embodiment, a method of making a symmetrical
fabric foot pocket comprises the steps of forming an upper portion
of a symmetrical fabric foot pocket by having a first stretchable
fabric layer with a curved end, and side portions. Placing a second
less-stretchable fabric layer with a curved end, and side portions
over at least part of an upper surface of the first stretchable
fabric layer. Joining the first stretchable fabric layer to the
second less-stretchable fabric layer, and attaching a heel strap to
at least part of the first stretchable fabric layer and at least
part of the second less-stretchable fabric layer. Forming a lower
portion of the symmetrical fabric foot pocket by having a
stretchable fabric bottom layer with a curved end, and side
portions, and defining at least one drain hole in the stretchable
fabric bottom layer. Placing the upper portion of the symmetrical
fabric foot pocket over the lower portion of the symmetrical fabric
foot pocket such that the curved ends of the first and second
layers of the upper portion are aligned with the bottom layer of
the lower portion and such that the upper and lower portions are
generally symmetrical about a longitudinal centerline. Joining the
upper portion of the symmetrical fabric foot pocket with the lower
portion of the symmetrical fabric foot pocket around the curved
ends and along the side portions such that the upper and lower
portions form a pocket having an opening at an end opposite the
curved ends.
[0022] In still another embodiment, a symmetrical fabric foot
pocket for a swim fin comprises an upper symmetrical portion and a
lower symmetrical portion. The upper symmetrical portion has a
first stretchable fabric layer, a second less-stretchable fabric
layer disposed over at least a portion of an upper surface of the
first stretchable fabric layer, and a heel strap. The lower
symmetrical portion has a stretchable fabric bottom layer. The
lower symmetrical portion extends generally parallel to the upper
symmetrical portion.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] These and other features, aspects and advantages of the
present invention are described below with reference to a preferred
embodiment, that is intended to illustrate, but not to limit the
present invention. The drawings contain five figures.
[0024] FIG. 1 is a side elevational view of a swim fin
incorporating features of the present invention;
[0025] FIG. 2 is an exploded perspective view of the bottom of the
swim fin of FIG. 1;
[0026] FIG. 3 is top view of the swim fin of FIG. 1;
[0027] FIG. 4 is a bottom view of the swim fin of FIG. 1, with the
heel strap portion removed; and
[0028] FIG. 5 is a cross-sectional view of the swim fin of FIG. 1,
taken along the cross-sectional line identified by the reference
numeral 5 in FIG. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0029] FIG. 1 illustrates a swim fin 10, including a fabric foot
pocket 12. The swim fin 10 is described herein with reference to
one preferred embodiment. In a preferred embodiment of the present
invention a fabric foot pocket 12, a fin blade 14, and a fin sole
16 are joined together to form a swim fin 10.
[0030] Fabric Foot Pocket
[0031] As shown in FIGS. 1 through 3, the fabric foot pocket 12 has
a fabric pocket portion 18 and a heel strap portion 20. The fabric
pocket portion 18 preferably covers a portion of a user's foot from
the user's toes to about the user's arch and, more desirably, to
about the center of the user's arch. The heel strap portion 20
preferably defines a space for a user's heel, such that when the
swim fin is worn by a user, the user's heel extends beyond the
fabric pocket portion 18 of the foot pocket 12. Additionally, the
user's heel preferably extends beyond the fin blade 14 and fin sole
16. The fabric pocket portion 18 preferably extends over an edge of
the fin blade 14 and fin sole 16 to provide a comfortable fit for
the user. The heel strap portion 20 passes around the back of the
heel of the user and is connected to each side of the fabric pocket
portion 18 to hold the foot of the user within the foot pocket
12.
[0032] The fabric foot pocket 12 has an open heel configuration
that is preferable to foot holding elements used on some other
fins. Closed heel configurations generally fit only one size foot.
The foot of a user may not fit precisely in a fin having a closed
heel configuration, such as, for example, a bootie or fin sock. The
foot holding element may be too large or too small for a user's
foot. Additionally, fins with closed heel configurations may trap
more sand or foreign objects within the foot holding element. An
open heel configuration with an adjustable heel strap portion 20
allows for a precise fit on the user's foot. Additionally, the same
fin may accommodate feet of varying sizes simply by adjusting the
heel strap portion 20. Finally, the open heel configuration is less
likely to trap sand and foreign objects.
[0033] The fabric foot pocket 12 has a closed toe configuration
that is preferable to foot holding elements used on some other
fins. Open toe configurations generally expose a user's toes to
objects in the water that may harm the user, such as, for example,
rocks or coral. Additionally, open toe configurations do not
generally insulate the toes of a user from cold water. The closed
toe configuration of the foot pocket protects the user's toes from
injury and acts to insulate the user's foot from cold water.
[0034] The fabric foot pocket 12 has a comfortable fabric pocket
portion 18 that is preferable to foot holding elements used on some
other fins. Some fins incorporate foot holding elements that have a
generally rigid construction. These types of foot holding elements
may be rigid about the toe region. In some cases, a user may
develop a foot cramp because the toe portion of the rigid foot
holding element may be confining the user's toes. Additionally,
these types of foot holding elements may be rigid on the instep
region or other locations where the foot of the user may rub and
chafe. The comfortable fabric pocket portion 18 of the foot pocket
12 comfortably holds the foot of the user on the fin.
[0035] The foot pocket 12 preferably has a generally symmetrical
shape about a longitudinal centerline. Foot pockets with a
generally symmetrical shape have advantages over asymmetrical foot
pockets, such as foot pockets that are formed to resemble the shape
of a user's foot. Symmetrical pockets help ensure a balanced
distribution of force over the fin blade. Additionally, symmetrical
pockets tend to hold a user's foot in a position that help's
prevent rotation of the fin blade during use. Such rotation can be
the cause of injuries to the user or loss of propulsive force
during use. Furthermore, symmetrical pockets are cheaper and easier
to manufacture and assemble than asymmetrical foot pockets.
Finally, swim fins with symmetrical foot pockets often may be used
interchangeably on either foot providing users with greater
flexibility when dealing with multiple pairs of fins.
[0036] The foot pocket 12 has an upper portion 22 and a lower
portion 24. The lower portion 24 of the foot pocket 12 will be
discussed further below. The upper portion 22 of the foot pocket 12
preferably has a first layer of stretchable fabric 26. The first
layer of stretchable fabric 26 preferably is a stretchable foam
fabric, such as, for example, Neoprene. The first layer of
stretchable fabric 26 preferably is a strip of fabric having at
least one curved end. Preferably, the curved end of the first
fabric layer generally forms an arc. Preferably, the curved end of
the fabric corresponds to the toe region of the foot pocket 12. The
first layer of stretchable fabric preferably provides a comfortable
fit about the toes and arch of the user while holding the foot
snuggly.
[0037] The upper portion 22 of the foot pocket 12 preferably has a
second layer of fabric 28. The second layer of fabric 28 preferably
is less stretchable than the first layer of fabric 26. The second
layer of fabric 28 preferably is made of a fabric such as, for
example, Cordura or Codra. The second layer of fabric 28 preferably
is a strip of fabric having at least one curved end. Preferably,
the curved end of the second fabric layer generally forms an arc.
Preferably, the curved end of the fabric corresponds to the toe
region of the foot pocket 12. The second layer 28 preferably
corresponds in shape with at least a portion of the first layer 26.
Preferably, the curved end of the second layer 28 corresponds with
the curved end of the first layer 26. The second layer 28
preferably is shorter than the first layer 26. The second layer 28
preferably does not extend in a direction opposite its curved end
as far as the first layer 26 extends in a direction opposite its
curved end. The second less stretchable fabric layer 28 provides
increased support to the upper portion 22 of the foot pocket 12
while maintaining flexibility. The extra support is useful to help
transfer force from the user's foot to the fin blade 14 as the user
kicks. Additionally, the second less stretchable fabric layer 28 of
the foot pocket 12 helps prevent tearing of the foot pocket 12.
[0038] The second less stretchable fabric layer 28 of the foot
pocket 12 preferably does not give or flex significantly under the
force generated by the user's kick. The second less stretchable
fabric layer 28 preferably provides a surface that is strong enough
to accommodate the full force of the user's downward stroke and
transfer that force to the fin blade 14, generating increased
propulsion for the user.
[0039] The second layer 28 of the upper portion 22 preferably is
joined to the first layer 26 of the upper portion 22. The second
layer 28 preferably is placed over the first layer 26 such that the
curved ends of the layers are aligned and the first layer 26
extends beyond the second layer 28 in a direction opposite the
curved ends. The second layer 28 preferably is joined to the first
layer 26 at least at a location where the first layer 26 extends
beyond the second layer 28,. The layers preferably are joined
together with at least one strip of tape material 30, such as, for
example, Nylon tape, being placed over the two layers 26, 28 and
sewn down with thread 32, such as, for example, Nylon thread.
Preferably, at least a second strip of tape material 34 is placed
over the two layers 26, 28 and the first strip of tape material 30,
and sewn down with thread 36, to strengthen the connection between
the layers. Preferably, the connection between the first
stretchable layer 26 and the second less stretchable layer 28 is
strong enough, and provides adequate support for the layers 26, 28,
so that the layers 26, 28 do not tear or pucker under the forces
generated by normal use.
[0040] The upper portion 22 of the foot pocket 12 preferably
comprises an instep strap 38, as best seen in the cross sectional
view of FIG. 5. The instep strap 38 preferably is an adjustable
strap. The instep strap 38 provides additional support along the
instep of the foot of the user. By adjusting the instep strap 38 to
fit snuggly over the top of the foot the force generated by the
foot can be transferred to the fin blade more effectively. The
instep strap 38 preferably has a first piece 40 and a second piece
42. The pieces preferably comprise fabric material such as, for
example, Nylon webbing. The first piece 40 of the instep strap 38
preferably has a section of fabric including either hook or loop
fasteners. The second piece 42 of the instep strap 38 preferably
has a section of fabric including either loop or hook fasteners to
releasably join with the hook or loop fasteners of the first piece
40 of the instep strap 38.
[0041] Preferably, a section 44 of the first piece 40 of the instep
strap 38 is attached toward one side 46 of the fabric pocket
portion 18 such that the two ends 48, 50 of the first piece 40
extend toward another side 52 of the fabric pocket portion 18 where
the second piece 42 of the instep strap 38 is attached. The second
piece 42 of the instep strap 38 preferably has the loop or hook
fasteners on upper and lower sides of the piece. The first piece 40
of the instep strap 38 preferably has hook or loop fasteners on the
two ends 48, 50 of the of first piece 40 such that one end 48 is
fastened to the upper side of the second piece 42 and the other end
50 is fastened to the lower side of the second piece 42.
[0042] The first piece 40 of the instep strap 38 preferably also
has a section of material, such as, for example, Nylon tape,
extending from at least one end to form a pull-tab (not shown). The
instep strap 38 preferably is joined to the upper portion 22 of the
foot pocket 12. Preferably the instep strap 38 is joined to the
first layer 40 of the upper portion 22 of the foot pocket 12,
toward side edges 46, 52 of the fabric pocket portion 18, as will
be described further.
[0043] Additionally, in other embodiments, the instep strap 38 may
be a single strap that is joined to one side of the foot pocket 12.
The instep strap 38 may be placed over the instep of the user's
foot and through a loop on another side of the foot pocket 12. The
instep strap 38 may then be adjustably fastened by folding the
instep strap 38 back on itself and releasably attaching one part of
the instep strap 38 to another part of the instep strap 38 using
hook and loop fasteners.
[0044] Referring to FIG. 3, a portion 54 of the first fabric layer
26 of the upper portion 22 of the foot pocket 12 preferably is
folded up and over the instep strap 38. Advantages of folding a
portion 54 of the first fabric layer 26 over the instep strap
include, first, providing a streamlined housing for the instep
strap to reduce drag on the fin that may be caused by the instep
strap as the user travels through the water, and second, providing
a soft rolled edge or surface for contacting the foot of the user
to prevent chaffing and blistering. An end of the folded portion 54
preferably is turned under and stitched forming a finished edge 56.
The folded portion 54 of the first fabric layer 26 covering the
instep strap 38 preferably is joined at least to another portion of
the first fabric layer 26 toward its side edges 46, 52, as will be
described further.
[0045] The foot pocket 12 has a heel strap portion 20 that is
joined to the upper portion 22 of the foot pocket 12 on the fabric
pocket portion 18. Preferably the heel strap portion 20 comprises
side sections 58, 60 that are attached to the upper portion 22 of
the foot pocket 12. The heel strap side sections 58, 60 preferably
comprise a relatively non-stretchable material such as, for
example, Nylon webbing. The heel strap portion 20 has advantages
over heel strap portions of some other swim fins. Some swim fins
have heel straps that are fastened through pins that are molded
into the fin blade. The pins on some of these types of fins may
break through the fin blade. Additionally, some swim fins have heel
straps that have multiple or complicated fitting parts, including
metal parts. These parts may break or corrode after prolonged
exposure to the water. The heel strap portion 20 has the advantage
of distributing force over the foot pocket to reduce the likelihood
of breakage. Additionally, the materials used in the heel strap
portion and foot pocket are less likely to corrode.
[0046] The side sections 58, 60 of the heel strap 20 preferably
extend along sides of the upper portion 22 of the foot pocket 12.
The side sections 58, 60 of the heel strap 20 preferably are
attached to at least part of the second fabric layer 28 of the
upper portion 22. The side sections 58, 60 of the heel strap 20
preferably are also attached to at least part of one or more strips
of tape material 30, 34 joining the first fabric layer 26 with the
second fabric layer 28 of the upper portion 22 of the foot pocket
12. Additionally, each side section 58, 60 of the heel strap 20
preferably is attached to the first fabric layer 26 of the upper
portion 22 and also attached to one of the pieces 40, 42 of the
instep strap 38 toward a respective side edge 46, 52 of the fabric
pocket portion 18.
[0047] One of the side sections 58 of the heel strap 20 preferably
passes under the folded portion 54 of the first fabric layer 26,
through a slit formed near the location where the material is
folded. The other side section 60 of the heel strap 20 preferably
passes over, and is also attached to, the folded portion 54 of the
first fabric layer 26, such that the folded portion 54 is bound, on
that respective side edge, to the side section 60 of the heel strap
20, one of the pieces 42 of the instep strap 38, and the rest of
the first layer 26 of, the upper portion 22.
[0048] The heel strap portion 20 of the foot pocket 12 preferably
comprises a buckle 62. The buckle 62 preferably is attached to the
side section 60 of the heel strap 20 that passes over the folded
portion 54 of the first fabric layer 26 of the upper section 22 of
the fabric foot pocket 12. The buckle 62 preferably has a double
bar configuration. The side section 60 of the heel strap 20 that
passes over the folded portion 54 of the foot pocket 12 preferably
is looped over one of the bars of the buckle 62 and attached to the
upper portion 22 of the foot pocket 12 on both sides of the loop
64. The buckle 62 preferably is a curved tension lock buckle with a
high release. The buckle 62 preferably is made of a plastic
material such as, for example, Acetal or Nylon plastic.
[0049] The heel strap portion 20 of the foot pocket 12 preferably
comprises a central strap section 66 and an extension strap section
68. The central strap section 66 of the heel strap 20 preferably
comprises a pad 70, a stretchable strap segment 72, and a strap
keeper 74. The pad 70 preferably is a stretchable fabric such as,
for example, Neoprene. In order to enhance comfort and distribute
the force acting on the heel, the pad 70 is desirably about an inch
and a half wide. Additionally, the pad is preferably thicker than,
and at least as soft as, the stretchable strap segment 72.
Desirably, the pad is at least about an eighth of an inch thick and
at least as soft as Neoprene. The stretchable strap segment 72
preferably is an elastic strap having a combination of fabrics,
such as, for example, rubber and Nylon, woven together. An
advantage of a stretchable strap segment 72 is that the strap will
fit tightly on the heel of the user and stretch open for ease of
entry or exit of the user's foot.
[0050] The pad 70 preferably is joined to the stretchable strap
segment 72. Preferably, the pad 70 is sewn directly onto the
stretchable strap segment 72. The strap keeper 74 preferably is a
loop of plastic material, such as, for example, Nylon plastic, that
preferably is secured between the pad 70 and the stretchable strap
segment 72, the loop extending away from the pad 70 to receive the
loose end of the extension strap segment 68 described further
below.
[0051] One side of the central strap section 66 is joined to the
side section 58 of the heel strap 20 that passes under the folded
portion 54 of the foot pocket 12. An end 76 of the side section 58
of the heel strap 20 passing under the folded portion 54 extends
beyond an edge of the fabric pocket portion 18 of the foot pocket
12. The end 76 of the side section 54 preferably is joined to both
the stretchable strap segment 72 and the pad 70 of the central
strap section 66 of the heel strap 20. Additionally, an end 78 of
the pad 70 closest the end 76 of the side section 58 preferably
extends beyond the edge of the stretchable strap segment 76, toward
the fabric pocket portion 18 of the foot pocket 12, and preferably
is joined to the first fabric layer 26 of the upper portion 22 of
the foot pocket 12.
[0052] The heel strap portion 20 of the foot pocket 12 preferably
comprises an extension strap section 68. The extension strap
section 68 of the heel strap 20 preferably is a relatively
non-stretchable material such as, for example, Nylon webbing. The
extension strap section 68 preferably is joined to both the
stretchable strap segment 72 and the pad 70 of the central strap
section 66 of the heel strap 20. The extension strap section 68
preferably is sufficiently long to be looped through the buckle 62.
The extension strap section 68 can be moved through the buckle 62
to adjust the effective length of the heel strap portion 20
relative to the ends of the fabric foot pocket 18. The loose end of
the extension strap section 68 can be placed through the loop of
the strap keeper 74 located on the central strap section 66.
[0053] As mentioned previously, the foot pocket 12 has an upper
portion 22 and a lower portion 24. The lower portion 24 of the foot
pocket 12 extends generally parallel to the upper portion 22. The
lower portion 24 of the foot pocket 12 preferably comprises at
least a bottom layer of stretchable fabric 80. The bottom layer of
stretchable fabric 80 preferably is a stretchable foam fabric, such
as, for example, Neoprene. The bottom layer of stretchable fabric
80 preferably is a strip of fabric having at least one curved end.
Preferably, the curved end of the bottom fabric layer 80 generally
forms an arc. Preferably, the curved end of the fabric corresponds
to the toe region of the foot pocket 12.
[0054] The bottom layer 80 preferably corresponds in shape with at
least a portion of the first layer 26 of the upper portion 22 of
the foot pocket 12. Preferably, the curved end of the bottom layer
80 corresponds with the curved ends of the first and second layers
26, 28 of the upper portion 20. The bottom layer 80 preferably is
shorter than the first layer 26 of the upper portion 22 and
preferably longer than the second layer 28 of the upper portion 22.
The bottom layer 80 preferably does not extend in a direction
opposite its curved end as far as the first layer 26 extends in a
direction opposite its curved end, when the first layer 26 is in an
unfolded orientation. However, when the first layer 26 of the upper
portion 22 is folded over, as described previously, the length of
the first layer 26, from the curved end to the fold, preferably is
generally the same as the length of the bottom layer 80 from its
curved end to its opposite end. The bottom layer 80 preferably
extends in a direction opposite its curved end further than the
second layer 28 of the upper portion 22 extends in a direction
opposite its curved end.
[0055] The bottom layer 80 of the lower portion 24 of the foot
pocket 12 preferably defines one or more drain holes 82. The bottom
layer 80 preferably defines at least one relatively larger primary
drain hole 84 and preferably multiple relatively smaller secondary
drain holes 86, of potentially various sizes, preferably located
toward the curved end of the bottom layer 80 and extending toward
the sides 88, 90 of the bottom layer 80. Preferably, a series of
smaller secondary drain holes 86 extend further toward the toe
region and the side portions 88, 90 of the stretchable fabric
bottom layer 80 than the primary drain hole 84 extends toward the
toe region and the side portions 88, 90.
[0056] The sizes of the drain holes 82 may vary depending on the
size of the fin 10. In one embodiment, the primary drain hole 84
preferably is about one half of an inch in diameter, a centrally
located secondary drain hole 86 preferably is about one quarter of
an inch in diameter, and other secondary drain holes 86 preferably
are about one eighth of an inch in diameter. Incorporating multiple
holes 82 in the foot pocket 12 allows for better drainage of sand
and water from the foot pocket while maintaining the strength and
integrity of the foot pocket 12. By increasing the number of holes
defined in the foot pocket, and spreading them out over the toe and
side regions where sand may accumulate, more water is likely to
circulate in the foot pocket 12 to flush out sand and other foreign
objects.
[0057] The upper portion 22 of the foot pocket 12 preferably is
joined to the lower portion 24 of the foot pocket 12 such that a
space 92 is defined between the upper and lower portions 22, 24. As
previously discussed, the upper portion 22, preferably comprises
first and second layers 26, 28 (preferably aligned and joined with
at least one strip of tape material 30), a heel strap portion 20
(preferably having heel strap side sections 58, 60, a buckle 62, a
central strap section 66, and an extension strap section 68), and
an instep strap 38 (preferably covered by a folded over portion 54
of the first layer 26). The lower portion 24 preferably comprises a
bottom layer 80 as described above.
[0058] The upper portion 22 preferably is placed over the lower
portion 24 such that the curved ends of the first and second layers
26, 28 of the upper portion 22 are aligned with the bottom layer 80
of the lower portion 24. The lower portion 24 preferably is joined
to the upper portion 22 at least around the curved ends and along
the side portions 88, 90, the upper and lower portions 22, 24
forming a pocket 92 having an opening at an end opposite the curved
ends. The upper and lower portions 22, 24 preferably are joined
together with at least one strip of webbing material (not shown),
such as, for example, Nylon webbing, being placed around the edges
of the upper and lower portions 22, 24. The upper and lower
portions 22, 24 and upper and lower ends of the webbing material
preferably are sewn together at least around the curved ends and
along the side portions 88, 90 of the upper and lower portions 22,
24 of the foot pocket 12.
[0059] The complete foot pocket 12, including upper and lower
portions 22, 24, preferably is placed on the fin blade 14 and
joined to the fin blade 14 and fin sole 16 as described below.
[0060] Fin Blade
[0061] The fin blade 14 preferably comprises a tip portion 94 at
one end of the blade 14 and a foot pocket receiving portion 96 at
another end of the blade 14. The fin blade 14 also comprises side
ribs 98, 100 extending from the tip portion 94 to the foot pocket
receiving portion 96 along the edges of the blade 14. The fin blade
14 has a blade deck 102 located generally between the tip portion
94 and the foot pocket receiving portion 96 and between the side
portions of the blade 14. The fin blade 14 preferably is a single
molded piece of plastic.
[0062] The fin blade 14 preferably has a generally symmetrical
shape about a longitudinal centerline. The tip 94 of the blade 14
preferably has two side edges 104, 106 that are about equidistant
from a longitudinal centerline and about equidistant from the foot
pocket receiving portion 96. A center section 108 of the tip 94 of
the blade 14 preferably extends beyond the side edges 104, 106 to
form a central tip 108 located along a longitudinal centerline. The
symmetrical shape of the fin blade 14 spreads the force generated
during a user's kick equally across the width of the blade 14.
Accordingly, permanent blade warping and stress on a user's ankles
and knees that may be associated with nonsymmetrical blades are
greatly reduced and more propulsive force is generated.
[0063] Embodiments of the invention may include fins of many
different lengths or structures. The length and shape of a fin
blade preferably may vary depending on the type of activity the fin
is designed for. For example, in one embodiment, the swim fin is a
surf style swim fin designed for use while body surfing or body
boarding. In one embodiment of a surf style swim fin, the fin blade
preferably is from about 10 inches long to about 16 inches long.
Other embodiments of the invention include fitness fins, skin
diving fins, SCUBA diving fins, and many other types of fins. The
length of the fin blade may vary significantly depending on the
type of intended use or the type of user.
[0064] The foot pocket receiving portion 96 of the fin blade 14
preferably has a shape that generally corresponds to the shape of
the fabric foot pocket 12. The foot pocket receiving portion 96
preferably has a generally symmetrical shape about a longitudinal
centerline to correspond with a symmetrical fabric foot pocket 12.
The foot pocket receiving portion 96 preferably has a support
portion 110 for contacting the fabric foot pocket 12.
[0065] The support portion 110 of the foot pocket receiving portion
96 preferably extends generally parallel to the blade deck 102. The
parallel extension of the support portion 110 of the foot pocket
receiving portion 96 relative to the blade deck 102 holds the foot
pocket 12 generally parallel to the blade deck 102. This allows a
user to kick without creating undue stress on the user's foot or
ankle that may be caused if the support portion 110 of the foot
pocket receiving portion 96 is angled relative to the blade deck
102. Some angled configurations of the support portion 110 may tend
to cause a user's foot rotate, potentially injuring the user or
resulting in less propulsive force generated by the user.
[0066] Additionally, the foot pocket receiving portion 96
preferably defines one or more holes 112 corresponding to the holes
82 defined in the bottom layer 80 of the lower portion 24 of the
fabric foot pocket 12. The holes 112 may be the same size and
configuration as the holes 82 in the fabric foot pocket 12, or they
may be of different sizes and configurations. Preferably, the holes
112 are defined and configured such that water and sand can be
flushed from the fabric foot pocket 12 out of the fin 10.
[0067] The sizes of the holes 112 may vary depending on the size of
the fin 10. In one embodiment, one of the holes 112, preferably
corresponding to the primary drain hole 84, desirably is about one
inch in diameter, while other holes 112, corresponding to secondary
drain holes 86, preferably are about one quarter of an inch in
diameter to about three eighths of an inch in diameter. In some
embodiments, holes 112 may be formed during the molding process. In
some embodiments, holes 112 may be punched or drilled following the
molding process.
[0068] The fin blade 14 preferably has fillets 114 along
intersections of the side ribs 98, 100 and the blade deck 102. The
fillets 114 are curved portions of the fin blade 14 that join the
side ribs 98, 100 to the top and bottom surfaces of the blade deck
102. Incorporating fillets 114 along intersections of side ribs 98,
100 and blade decks 102 provides greater strength against bending
than a swim fin having side ribs that join the blade deck at right
angles. The added strength of the blade creates greater propulsion
forces for the user.
[0069] The fin blade 14 preferably has a plurality of grooves 116
defined on a surface of the blade deck 102. Preferably, the grooves
116 are defined on upper and lower surfaces of the blade deck 102.
Preferably, the grooves 116 extend from the foot pocket receiving
portion 96 to the tip portion 94 of the blade 14. The grooves 116
act as water flow channels that direct the water toward the tip 94
of the fin blade 14 as a user moves forward through the water. The
grooves 116 preferably are uninterrupted by surfaces that would
create turbulence. The grooves 116 help to prevent drag on the fin
that can be caused by alternative grooves or waffle designs that
are oriented on the blade so that they interfere with the free flow
of water toward the tip of the blade, which is the end of the blade
as a user moves forward through the water.
[0070] Additionally, the fin blade 14 preferably has a tapered
strut 118 extending out from the blade deck 102 along the bottom
surface of the fin blade 14. The strut 118 provides further support
for the fin blade 14 and keeps it from folding or bending
excessively.
[0071] Fin Sole
[0072] The fin sole 16 has a base portion 120 preferably with tread
122 formed thereon. The tread 122 preferably is diamond shaped and
preferably is distributed uniformly over the sole 16. An advantage
of tread 122 is to assist in preventing a user from slipping when
walking on hard surfaces such as boat docks, rocks or jetties. The
fin sole 16 preferably is a single molded piece of plastic or
rubber material. Additionally, in some other embodiments of the
invention, the fin sole 16 may be formed as an integral part of the
fin blade 14 rather than as a separate piece.
[0073] The fin sole 16 preferably has a shape that generally
corresponds to the shape of the foot pocket receiving portion 96 on
the fin blade 14. The fin sole 16 preferably has a generally
symmetrical shape about a longitudinal centerline to correspond
with a symmetrical foot pocket receiving portion 96. The sole 16
preferably is joined to a lower surface of the fin blade 14 at the
foot pocket receiving portion 96. The sole 16 preferably has a
fabric material, such as, for example, Nylon webbing, attached
along its outer edges. The fabric material preferably is attached
to the upper and lower surfaces of the sole 16 along the edges of
the sole 16. Strips of fabric material preferably extend from the
sole 16 near the side edges of the sole 16 nearest the opening 92
in the foot pocket 12. The strips of fabric material preferably are
folded up around the edge of the fin blade and joined with the foot
pocket in the assembly process.
[0074] Additionally, the fin sole 16 preferably defines one or more
holes 124 corresponding to the holes 82 defined in the bottom layer
80 of the lower portion 24 of the fabric foot pocket 12 or the
holes 112 defined in the foot pocket receiving portion 96 of the
fin blade 14. The holes 124 may be the same size and configuration
as the holes 82, 112 in the fabric foot pocket 12 or fin blade 14,
or they may be of different sizes and configurations. Preferably,
the holes 124 are defined and configured such that water and sand
can be flushed from the fabric foot pocket 112 out of the fin 10.
Additionally, the size and configuration of the holes 82, 112, 124
in the swim fin 10 preferably are sized and configured to allow for
adequate flushing of the foot pocket 12 while maintaining strength
and integrity of the support portion 110 of the foot pocket
receiving portion 96 and the base portion 120 of the fin sole
16.
[0075] The sizes of the holes 124 may vary depending on the size of
the fin 10. In one embodiment, one of the holes 124, preferably
corresponding to the primary drain hole 84, desirably is about one
inch in diameter, while other holes 124, corresponding to secondary
drain holes 86, preferably are about one quarter of an inch in
diameter to about three eighths of an inch in diameter.
Additionally, the support portion 110 of the foot pocket receiving
portion 96 preferably is at least about one sixteenth of an inch
thick and the base portion 120 of the fin sole 16 preferably is
about one eighth of an inch thick. In some embodiments, holes 124
may be formed during a molding process. In some embodiments, holes
124 may be punched or drilled following a molding process.
Incorporating multiple holes of varying sizes spread over a bottom
portion of the fin, as opposed to a single large central hole,
provides drainage to a greater effective area while maintaining the
strength and stability of the foot pocket 12, fin blade 14 and fin
sole 16.
[0076] The base 120 of the fin sole 16 preferably is configured
such that, when the base 120 of the fin sole,16 is joined to the
foot pocket receiving portion 96 of the fin blade 14, the base
portion 120 of the fin sole 16 extends generally parallel to the
blade deck 102. The extension of the base 120 of the fin sole 16
generally parallel to the blade deck 102 allows the user to keep
the fin blade 14 generally parallel with the bottom of the user's
foot. This allows the user to maximize the propulsive force of each
kick. Additionally, the user is better able to walk or run outside
of the water because the fin blade 14 is elevated with respect to
the fin sole 16, and the fin blade 14 is not angled substantially
relative to the fin sole 16. Fin blades that are angled relative to
fin soles may experience increased wear on the blade, and may cause
the user to walk unevenly. Accordingly, a swim fin having a blade
14 that is elevated from, and generally parallel to, the base 120
of the fin sole 16 maximizes propulsion, acts to prevent wear on
the fin blade 14, and facilitates walking or running by the
user.
[0077] Swim Fin
[0078] As best shown in FIGS. 2, 3 and 4, the swim fin 10
preferably is formed by placing the fabric foot pocket 12, having
an upper portion 22 and lower portion 24, over the fin blade 14 at
the foot pocket receiving portion 96. Additionally, the fin sole 16
is placed below the fin blade 14 at the foot pocket receiving
portion 96. The fabric foot pocket 12, and the fin sole 16
preferably have generally corresponding shapes for alignment with
the foot pocket receiving portion 96 of the fin blade 14. The fin
sole 16 preferably is glued onto a bottom portion of the foot
pocket receiving portion 96.
[0079] The fabric foot pocket 22 preferably is sewn to the fin
blade 14 and the fin sole 16 around the curved end and side
portions 88, 90. Preferably, strips of fabric material of the fin
sole 16 are folded up around the edge of the fin blade 14 and
joined with the foot pocket 12 in the assembly process. The lower
portion 24 of the fabric foot pocket 12 preferably is also sewn to
the fin blade 14 and the fin sole 16 along the open edge of the
foot pocket 12. Preferably, the stitch attaching the lower portion
24 of the fabric foot pocket 12 to the fin blade 14 and fin sole 16
does not extend all the way to the side portions 88, 90 of the foot
pocket 12. The spaces on either side of the stitch act to allow
water to enter the fin between the foot pocket 12 and the fin blade
14 and facilitate flushing sand out of the fin. Additionally, the
lower portion 24 of the foot pocket preferably extends slightly
beyond the edge of the fin blade 14 and the fin sole 16 to
comfortably protect the bottom of the user's foot from chaffing or
cuts.
[0080] The embodiments described above include many features that
improve the comfort and performance of a swim fin, and that
effectively reduce manufacturing and production costs. Although
this invention has been disclosed in the context of a preferred
embodiments, it will be understood by those of skill in the art
that the present invention extends beyond the specifically
disclosed embodiments to other alternative embodiments and/or uses
of the invention and obvious modifications and equivalents thereof.
Accordingly, the invention is to be defined solely by the appended
claims.
* * * * *