U.S. patent application number 11/949617 was filed with the patent office on 2009-06-04 for shaft structure with configurable bending, weight, moment-of-inertia and torque profile.
Invention is credited to Gregory K. Qualizza.
Application Number | 20090143161 11/949617 |
Document ID | / |
Family ID | 40676315 |
Filed Date | 2009-06-04 |
United States Patent
Application |
20090143161 |
Kind Code |
A1 |
Qualizza; Gregory K. |
June 4, 2009 |
Shaft Structure with Configurable Bending, Weight,
Moment-of-Inertia and Torque Profile
Abstract
A shaft structure with a configurable bending, weight, torque
and moment-of-inertia profile is provided for golf clubs, fishing
rods, and the like. The shaft structure employs an innovative inner
and outer shaft structure. The golfer, in practice, configures the
profile of a golf shaft by choosing from a plurality of different
inner shaft structures each having a unique bending, weight,
moment-of-inertia and torque profile. The inner shaft is securely
fastened within the outer shaft. The combination of the inner shaft
with the outer shaft results in an advantageous bending, weight,
torque and moment-of-inertia profile. The golfer can, at any time
and very easily, change the profile of the golf shaft according to
their physical, course and weather conditions for any given
day.
Inventors: |
Qualizza; Gregory K.;
(Orland Park, IL) |
Correspondence
Address: |
WILSON DANIEL SWAYZE, JR.
3804 CLEARWATER CT.
PLANO
TX
75025
US
|
Family ID: |
40676315 |
Appl. No.: |
11/949617 |
Filed: |
December 3, 2007 |
Current U.S.
Class: |
473/288 ;
473/289; 473/318 |
Current CPC
Class: |
A63B 60/10 20151001;
A63B 60/002 20200801; A01K 87/00 20130101; A63B 60/08 20151001;
A63B 53/005 20200801; A63B 60/0081 20200801; A63B 60/42 20151001;
A63B 53/08 20130101; A63B 53/10 20130101; A63B 53/00 20130101; A63B
60/06 20151001 |
Class at
Publication: |
473/288 ;
473/318; 473/289 |
International
Class: |
A63B 53/10 20060101
A63B053/10 |
Claims
1. A configurable shaft structure, comprising an outer shaft
structure and an interchangeable inner shaft structure; said
interchangeable inner shaft structure being detachably connected to
said outer shaft structure.
2. The shaft structure as in claim 1, wherein said interchangeable
inner shaft structure includes a characteristic of a stiffness.
3. The shaft structure as in claim 2, wherein said stiffness of
said interchangeable inner shaft structure varies along the
longitudinal axis of said interchangeable inner shaft
structure.
4. The shaft structure as in claim 1, wherein said interchangeable
inner shaft structure includes a characteristic of a weight.
5. The shaft structure as in claim 4, wherein said weight of said
interchangeable inner shaft structure varies along the longitudinal
axis of said interchangeable inner shaft structure.
6. The shaft structure as in claim 1, wherein said interchangeable
inner shaft structure includes a characteristic of a torsional
rigidity about the longitudinal axis.
7. The shaft structure as in claim 6, wherein said torsional
rigidity of said interchangeable inner shaft structure varies along
the longitudinal axis of said interchangeable inner shaft
structure.
8. A configurable shaft structure as in claim 1, wherein said
interchangeable inner shaft structure includes a male coupling
device and said outer shaft section includes a female coupling
device wherein said female coupling device receives said male
coupling device in mechanical cooperation to mechanically convey
rotational motion thereof.
9. A configurable shaft structure as in claim 8, wherein said male
coupling device and said female coupling device include a locking
mechanism.
10. A modifiable shaft structure, comprising an outer shaft
structure and a plurality of interchangeable inner shaft
structures; wherein at least one said interchangeable inner shaft
structure being in mechanical cooperation with said outer shaft
structure whereby the loading of said outer shaft structure
transfers same said loading upon said interchangeable inner shaft
structure such that the combination of resistance to said loading
is generated from the reaction of said outer shaft structure and
said interchangeable inner shaft structure to said loading; whereby
the weight of said modifiable shaft structure is derived from the
weight of said outer shaft structure and the weight of said
interchangeable inner shaft structure in aggregate; whereby the
distribution of weight of said modifiable shaft structure is
derived from the distribution of weight of said outer shaft
structure and the distribution of weight of said interchangeable
inner shaft structure in aggregate; whereby the torsional rigidity
about the longitudinal axis of said modifiable shaft structure is
derived from the torsional rigidity of said outer shaft structure
and torsional rigidity of said interchangeable inner shaft
structure in aggregate; each said interchangeable inner shaft
structure comprising a stiffness, weight, distribution of weight
and torsional rigidity wherein the stiffness, weight, distribution
of weight and torsional rigidity may vary.
Description
FIELD OF THE INVENTION
[0001] This invention relates to shafts for golf clubs, fishing
rods and the like and more particularly where the overall bending,
weight, torque and moment-of-inertia profiles of these devices can
be configured by the user to match their physical abilities as well
as course and weather conditions.
BACKGROUND OF THE INVENTION
[0002] Golf shafts are typically manufactured with a predetermined
bending, weight, torque and moment-of-inertia profile. The "bending
profile" of a golf shaft refers to a distinct flex pattern that a
conventional golf shaft exhibits when subjected to a force. The
flex pattern is typically measured as the amount of deflection the
shaft experiences when the shaft is positioned horizontally and
subjected to a constant force.
[0003] Previous knowledge of golf shaft dynamics resulted in a
general understanding that the overall stiffness of a golf shaft
played a role in the performance of a golf club. However, it has
been discovered that the overall bending profile of the shaft has
much more to do with the performance of a golf club than merely its
overall stiffness. The bending profile directly contributes to ball
launch angle and spin, both of which can directly affect shot
distance and accuracy. Additionally, the bending profile can
influence club-head reaction and orientation before the clubface
makes contact with the ball. Presently, golf shafts are mass
produced with a predefined and fixed bending profile without regard
for a golfer's individual swing mechanics. Typically, these
parameters are designed in an attempt to accommodate a vast
multitude of golfers.
[0004] Prevailing weather conditions can also affect optimum ball
flight. For example, on a windy day, a golfer might choose to
reconfigure their shaft for a bending profile that promotes a lower
penetrating ball flight which reduces the affects of the wind.
Conversely, on a day with little or no wind, a golfer may choose to
configure the bending profile to promote a higher launch angle.
[0005] Course conditions can also dictate shot choice and
performance. On a course with narrow fairways a golfer may choose a
stiffer shaft so as to improve accuracy whereas a course that has
wider fairways but is longer would dictate a less stiffer shaft so
as to maximize distance.
[0006] The overall weight of a golf shaft plays a crucial part in
the performance of the golf club. The lighter the golf shaft the
more head speed a golfer can generate which translates into more
distance. However, some golfers find that a lighter shaft does not
allow them to "feel" the position of the head through the swing and
as result there is a loss of control. Therefore, some golfers
prefer a heavier golf shaft. The weight of the golf shaft is a
function of a golfer's preferences and can enhance performance.
[0007] The torque of a golf shaft directly relates to the
performance of a golf shaft. Torque is generally defined as
torsional resistance. As such, torque also relates to the amount
and type of feedback the golfer receives when the golf ball is
struck. A golf ball which strikes the toe or the heel of the golf
club causes the golf club head to rotate about its center of
gravity. This action causes the golf ball to drastically alter
course from the intended target line. Additionally, off center hits
generate vibrational energy that is then transmitted via the golf
shaft to the golfer's hands resulting in a "stinging" sensation.
Golf shafts with a relatively high torque rating can cause the golf
club head to rotate more thereby less energy is translated into
vibrational energy. As a result less vibrational energy is
transmitted to the golfer's hands. Conversely, a golf shaft that
has a low torque rating necessarily causes the golf club head to
rotate less thereby more energy is converted to vibrational energy
which is then transmitted to the golfer's hands. The torque of the
golf shaft is a function of a golfer's preferences and can enhance
performance.
[0008] The moment-of-inertia of a golf club can be directly
attributable to the "feel" of the golf club and with that the
performance by increasing the confidence level of the golfer. In
lieu of configuring a moment-of-inertia the golfer may choose to
configure the swing-weight of the golf club as indicated by a
swing-weight machine.
[0009] Various proposals to provide variable stiffness for a golf
club shaft (or even a fishing pole) have previously been made that
involve using a hollow shaft charged with a gas or liquid fluid
that can be pressurized and by mechanical devices such as rods,
jackscrews and the like. Increasing the fluid pressure in the shaft
increases the shaft stiffness. Increasing the length of the rod
increases the tension and hence shaft stiffness.
[0010] Such pressurizable shafts are illustrated, for example, by
Menzies U.S. Pat. No. 1,831,255, Sears U.S. Pat. No. 2,432,450,
Busch U.S. Pat. No. 3,037,775, Burrough U.S. Pat. No. 4,800,668 (a
fishing rod), Simmons U.S. Pat. No. 5,316,300, Koch et al. U.S.
Pat. No. 5,540,625, Painter U.S. Pat. No. 5,632,693 and Qualizza
U.S. Pat. No. 7,226,365.
[0011] So far as is known, these variable stiffness, hollow shaft
structures of the prior art do not address changing a shaft's
bending profile but rather have defined a device which
indiscriminately promotes a stiffness change across the entire
shaft and never addresses the ability to adjust the bending
characteristics of the golf shaft. Additionally, the prior art does
not address being able to change a shaft's overall weight, torque
or moment-of-inertia.
SUMMARY OF THE INVENTION
[0012] In order for a golf club to be effective and ultimately
configured for a golfer by the golfer without requiring the golfer
to have intimate knowledge or club-building skills, the present
invention provides for a device that can be easily changed to
accommodate the golfer's abilities, weather and course condition
for any given day. The device can also be adapted for use in
existing golf shafts.
[0013] The present invention overcomes the inability of prior art
shafts to create a unique bending, weight, torque and
moment-of-inertia profile. The present invention also overcomes the
inability of the prior art to be able to effect a change in the
performance of the golf shaft by providing a device which does not
serve to present an axial stress force to a conventional shaft but
rather provides a device which combines a shaft-in-a-shaft
structure where an outer shaft is complimented by an inner,
configurable bending, weight, torque and moment-of-inertia profile
shaft. The inner shaft structure is placed within an outer shaft
structure, in effect forming a shaft within a shaft. The bending,
weight, torque and moment-of-inertia profile of the overall shaft
structure is born form the compounded action of both the inner and
outer shaft structures. Given this arrangement, new shafts as well
as existing shaft's bending, weight, torque and moment-of-inertia
profiles can be readily changed that will match the golfer's
abilities so as to maximize both shot accuracy and distance.
[0014] The inner shaft structure can easily be exchanged with
another thereby in effect changing the overall shaft bending,
weight, torque and moment-of-inertia profile. Each unique inner
shaft structure has a unique bending, weight, weight distribution
and torque rating. The configurable profile shaft does not require
special tools or skills to affect the configuration of the bending,
weight, moment-of-inertia or torque profile of an overall shaft
structure.
[0015] By choosing different inner shaft structures with each
having their own bending, weight, weight distribution and torque
parameters, an overall shaft structure can be built by the golfer
to accommodate their individual physical abilities as well as to
match course and weather conditions for an individual day. In
practice, the golfer extracts the inner shaft structure from the
outer shaft structure, chooses a new inner shaft structure and then
securely places the inner shaft structure back within the outer
shaft structure.
[0016] An object of the present invention is to provide an overall
shaft structure which allows a golfer to change the bending profile
of a golf shaft to suit their needs, physical abilities, course and
weather conditions.
[0017] Another object of the present invention is to provide an
overall shaft structure which allows a golfer to change the overall
weight of a golf shaft to suit their needs, physical abilities,
course and weather conditions.
[0018] Yet another object of the present invention is to provide an
overall shaft structure which allows a golfer to change the
moment-of-inertia of the shaft structure and hence "feel" of a golf
club to suit their preferences.
[0019] Another object of the present invention is to provide an
overall shaft structure which allows a golfer to change the torque
of a golf shaft to suit their preferences and physical needs.
[0020] Another object of the present invention is to provide a
shaft structure that has a selectable bending profile. Hence, a
single assembled shaft structure can replace many different
combinations and permutations of golf shafts, golf clubs, fishing
poles and manufacturing procedures and can avoid the need for large
inventories of golf clubs with golf club shafts pre-set to
different stiffness values, thereby effecting a saving of what
would otherwise be an expenditure of substantial amounts of
money.
[0021] Another object of the present invention is to provide a
shaft structure which allows a golfer to customize the bending
profile of each shaft of an entire set of clubs, or of fishing
poles, according to his ability or wishes without being dependent
upon the shaft stiffness, weight, torque and moment-of-inertia that
happens as a result from shaft manufacturing procedures as in the
prior art.
[0022] Yet another object of the current invention is to provide a
device which can be easily adapted to an existing shaft structure
so as to provide a golfer the ability to adjust the bending profile
of their existing golf shaft.
[0023] Yet another object of the current invention is to provide a
device which can be easily adapted to an existing shaft structure
so as to provide a golfer the ability to adjust the
moment-of-inertia profile of their existing golf shaft to match
that of their favorite club. Therefore, all the clubs in the bag
can have the same "feel" as their favorite club.
[0024] Another object of the present invention is to provide a
fishing rod structure which allows a fisherman to configure the
bending profile a fishing rod.
[0025] Another object of the current invention is to provide for a
device that can easily replicate the physical and hence performance
characteristics of any given shaft on the market. If a golfer
chooses they or a manufacturer of the current invention can
interrogate other golf shafts on the market in order to gather the
variable bending, weight, moment-of-inertia and torque
characteristics of the shaft. In this manner the resultant
behavioral characteristics can be duplicated by the present
invention. As such the present invention can replicate the
performance of virtually any other shaft on the market.
[0026] Other and further objects, aims, features, advantages,
applications, embodiments and the like regarding the present
invention will be apparent to those skilled in the art from the
present specification, attached drawings, and appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The invention may be understood by reference to the
following description taken in conjunction with the accompanying
drawings, in which, like reference numerals identify like elements,
and in which:
[0028] FIG. 1 illustrates a perspective view of one embodiment of a
golf club which incorporates a shaft structure of the present
invention;
[0029] FIG. 2 illustrates a view of the proximal end of inner shaft
structure of the shaft structure of FIG. 1;
[0030] FIG. 3 illustrates a more detailed view of the inner shaft
structure of the shaft structure of FIG. 1;
[0031] FIG. 4 illustrates a cross-sectional view of the connection
apparatus of the coupling section of the shaft structure shown in
FIG. 3;
[0032] FIG. 5 view of the distal end of inner shaft structure of
the shaft structure of FIG. 1;
[0033] FIG. 6 illustrates an alternative embodiment of the current
invention that reveals segmented inner shaft structure;
[0034] FIG. 7 illustrates a cross-sectional view of the segments of
the shaft structure shown in FIG. 6;
[0035] FIG. 8 illustrates a locking mechanism of the shaft
structure shown in FIG. 6;
[0036] FIG. 9 illustrates the nomenclature for displaying
stiffness, weight and torque for a segment for the shaft structure
shown in FIG. 6;
[0037] FIG. 10 illustrates an alternative embodiment of the current
invention using separate components for the bending profile,
weight, weight distribution and torque;
[0038] FIG. 11 illustrates yet another embodiment of the current
invention whereby the inner and outer shaft structures are in full
contact in effect forming one shaft with out the need for
spacers;
[0039] FIG. 12 illustrates another alternative embodiment of the
current invention that utilizes a thin layer of fluid to transmit
the bending profile of the outer shaft structure to the inner shaft
structure.
DETAILED DESCRIPTION
[0040] FIG. 1 reveals an illustrative golf club 10 that
incorporates an embodiment of an overall shaft structure 12 of the
present invention. In the preferred embodiment, overall shaft
structure 12 includes an outer shaft structure 18 and an inner
shaft structure 16. Both the outer shaft structure 18 and the inner
shaft structure 16 are defined by a proximal and distal end. In the
matter of a golf club the proximal end is accompanied by a
conventional golf grip 25 whereas the distal end is accompanied by
a conventional golf club-head 30. Shaft structure 12 is defined as
having an overall unique bending, weight, moment-of-inertia and
torque profile. The overall moment-of-inertia of shaft structure 12
is defined by the unique distribution of weight of both the outer
shaft structure 18 and the inner shaft structure 16. The bending,
weight, weight distribution and torque profile of the outer shaft
structure 18 remains constant and fixed. The inner shaft structure
16 exhibits a bending, weight, weight distribution and torque
profile as well but can be exchanged with a different inner shaft
structure 16 that exhibits a different bending, weight, weight
distribution and torque profile thereby in effect allowing the
golfer to modify the profile of the shaft structure 12 to their
preference. Both outer shaft structure 18 and inner shaft structure
16 can be fashioned from graphite, ferrous and non-ferrous metals,
plastics and the like and need not be of the same material. Those
skilled in that art will recognize that a vast multitude and
combinations of materials may be used for both the outer shaft
structure 18 and the inner shaft structure 16 and that the use of
alternate materials does not deviate from the scope or the spirit
of the present invention.
[0041] In the present invention both the outer shaft structure 18
and inner shaft structure 16 exhibit a bending profile that is
defined by a unique pattern of stiffness that traverses the inner
shaft structure 16 from the proximal end to the distal end
longitudinally. The pattern of stiffness allows for a unique
bending pattern for shaft structure 12 that is born from the
convoluted bending patterns of the inner shaft structure 16 and
outer shaft structure 18 which are in mechanical cooperation. The
outer shaft structure 18 is defined by a stiffness pattern that may
be constant from proximal to distal end or in other embodiments it
may change. In the preferred embodiment the inner shaft structure
16 has a stiffness pattern that changes from proximal to distal
end. In another embodiment and with an existing golf shaft 12 the
outer shaft structure 18 stiffness varies and defines the bending
pattern. In this mode the inner shaft structure 16 bending profile
would be profiled as a constant stiffness from proximal to distal
end. As a result the overall bending profile would remain constant
but the stiffness would increase. Those skilled in the art will
recognize that a multitude of combinations of bending patterns can
occur for the inner shaft structure, outer shaft structure or both
and that these various combinations do not deviate from the spirit
or scope of the present invention. This pattern defines, among
other things, the kick-point of the overall shaft structure 12. As
is well known in the industry the kick-point of the overall shaft
structure 12 is a major determinant in golf ball trajectory. For
instance, a high kick-point will cause a low golf ball trajectory
while a low kick-point will cause a high golf ball trajectory. A
mid kick-point will cause a mid golf ball trajectory.
[0042] In the present invention the overall weight of the shaft
structure 12 is defined by the weight of the outer shaft structure
18 in additive combination with the weight of the inner shaft
structure 16. The weight of the shaft structure 12 plays an
important role in the performance of a golf club 10 whereas a
lighter overall shaft structure 12 weight allows the golfer to
swing the golf club 10 faster thereby increasing club-head 30 speed
which translates into more distance. Although a heavier shaft
structure 12 and hence a heavier golf club 10 allows for less
club-head 30 speed there is a benefit that relates to accuracy
derived from being able to better control the golf club 10 due to
the lower swing speed. Additionally, as the golfer becomes older he
or she can regain swing-speed by making the overall shaft structure
12 lighter by exchanging the inner shaft structure 16 with one that
has less weight thereby reducing the overall weight of the golf
club 10.
[0043] In the present invention the weight profile or rather the
distribution of weight longitudinally is defined by the
distribution of weight of the outer shaft structure 18 in additive
combination with the distribution of weight of the inner shaft
structure 16. The weight distribution of the outer shaft structure
18 may be constant from proximal to distal end or in other
embodiments it may change. The weight distribution of the inner
shaft structure 16 is unique and can be distributed so as to effect
the overall moment-of-inertia of the golf club 10. In another
embodiment and with an existing golf shaft 12 the outer shaft
structure 18 weight distribution varies. In this mode the inner
shaft structure 16 weight distribution would be constant from
proximal to distal end. As a result the overall weight of the shaft
structure 12 would increase but not the distribution of weight.
Those skilled in the art will recognize that a multitude of
combinations of weight distributions can occur for the inner shaft
structure, outer shaft structure or both and that these various
distributions do not deviate from the spirit or scope of the
present invention. In more generic terms the moment-of-inertia
relates to the "feel" of the golf club 10 such as it is described
by a golfer as the golf club 10 being "heavy" or "light". A proxy
for moment-of-inertia is swing-weight of the golf club 10 as is
well known in the industry. In general terms the moment-of-inertia
will increase when more weight is placed toward the distal end of
the golf club 10 and will decrease as more weight is placed toward
the proximal end. In this regard weight distribution within the
inner shaft structure 16 can effect the moment-of-inertia.
[0044] The torque of a golf shaft 12 directly relates to the
performance of a golf shaft 12. The torque profile of the outer
shaft structure 18 is constant from proximal to distal end. The
torque profile of the inner shaft structure 16 is unique and can be
distributed so as to affect the torque profile of the overall shaft
12. As is well known torque relates to the amount and type of
feedback the golfer receives when the golf ball is struck.
Additionally, a golf ball which strikes the toe or the heel of the
golf club 10 causes the golf club head 30 to rotate about its
center of gravity. Off center hits also tend to generate
vibrational energy that is then transmitted via the golf shaft 12
to the golfers hands resulting in a "stinging" sensation. Golf
shafts 12 with a relatively high torque rating can cause the golf
club head 30 to rotate more. As a result less vibrational energy is
transmitted to the golfer's hands. Conversely, a golf shaft 12 that
has a low torque rating necessarily causes the golf club head 30 to
rotate less in which more energy is converted to vibrational energy
and on to the golfer's hands. The torque of the golf shaft 12 is a
function of a golfer's preference and can enhance performance.
[0045] In the preferred embodiment and referring to FIG. 2, inner
shaft structure 16 includes select bending, weight, weight
distribution and torque parameters and further includes a proximal
and distal end. Inner shaft structure 16 is held in place at the
proximal end by threaded cap 19. Threaded cap 19 cooperatively
engages threaded cup 21 of outer shaft structure 18 which is firmly
affixed to the inner diameter of outer shaft structure 18 by
conventional means. The proximal end of inner shaft structure 16
includes disk 25. Disk 25 includes longitudinal lands 3 and 5 which
cooperatively engage slots 7 and 9 respectively of threaded cup 21.
The cooperative engagement of lands 3 and 5 with slots 7 and 9
serve to anchor the torque as it is transmitted from the golf
club-head 30 to the inner shaft structure 16.
[0046] With reference to FIG. 3 inner shaft 16 is comprised of main
body 22, spacer 15, spacer 17, and spacer 19. Main body 22 is
designed so as to provide a distinct bending, weight, weight
distribution and torque profile. The distinct bending pattern for
main body 22 is driven from the material, diameter and wall
thickness. Weight is a function of density of material and wall
thickness. Torque is a function of material, diameter and wall
thickness. Those skilled in the art will recognize that initially
the bending, weight, weight distribution and torque profile are all
co-dependent upon the material, wall thickness and diameter of the
main body 22 of the inner shaft structure 16. As such the inner
shaft structure 16 will be designed taking into account of the
design parameters such as material type, wall thickness and
diameter. Distal end of inner shaft structure 16 is comprised of
coupler 26. In another embodiment an inner shaft structure system
may be designed that incorporates a plurality of inner shaft
structure such that each inner shaft structure would accommodate
one or more particular parameters. For instance, there may be an
inner shaft structure 16 for addressing the bending profile and
another inner shaft structure 16 that would address weight
distribution.
[0047] Spacers 15, 17 and 19 serve to support inner shaft structure
16 by virtue of mechanical communication with the outer shaft
structure 18 at strategic locations. The number and placement of
spacers 15, 17 and 19 are defined so as to transfer the bending
pattern of the outer shaft structure 18, when under load, to the
inner shaft structure 16. In this manner inner shaft structure 16
is then able to influence the bending profile of the overall shaft
structure 12 by virtue of its configurable arrangement. Those
skilled in the art will recognize that a multitude of different
types and means of support and location may be provided and these
alternative means and locations do not deviate from the scope or
spirit of the present invention.
[0048] Referring to FIG. 4, male coupling device 28 of coupler 26
includes platen 23 and cross member 24. Platen 23 has a diameter
that cooperates and is firmly affixed to the internal diameter of
the distal end of inner shaft structure 16. Cross member 24
includes male cross pattern which cooperates and is received by the
female cross pattern of the female coupling device 29. The diameter
of the female coupling device 29 cooperates and is affixed to the
inside diameter of outer shaft structure 18 by conventional means.
Further, coupler 26 serves to convey the torque that is imposed by
the club head 30 to inner shaft structure 16.
[0049] With further reference to FIG. 5 outer shaft structure 18 is
affixed to the inside diameter of hosel 35 of club-head 30. Inner
shaft structure 16 is placed within the outer shaft structure 18.
Upon the introduction of inner shaft structure 16 to outer shaft
structure 18 the golfer will choose to rotate the inner shaft
structure 16 so as to align the cross member 24 of male coupling
device 28 with female coupling device 29 of coupler 26. Once
aligned the inner shaft structure 16 of the male coupling device 28
engages with female coupling device 29 thus allowing the inner
shaft structure 16 to be fully seated. In this manner inner shaft
structure 16 is allowed to "float" or move axially but yet still
retain torque integrity generated at the club-head 30 due to the
arrangement of coupler 26. Those skilled in the art will recognize
that a multitude of designs can occur for the transferring of
torque from the club head 30 to the outer shaft structure 18 and
then to the inner shaft structure 16 and that these various other
designs do not deviate from the spirit or scope of the present
invention.
[0050] Female coupling device 29 receives and cooperates with male
coupling device 28 to form a structurally sound mechanical
detachably connection that, by design, structurally transitions,
homogenously, the characteristic torque generated at the club-head
30 to the inner shaft structure 16. Male coupling device 28 and
female coupling device 29 can be fabricated from lightweight
material such as carbon fiber or ultra-high-molecular weight (UHMW)
plastic.
[0051] FIG. 6 reveals an alternative embodiment including an outer
shaft structure 18 and inner shaft structure 16 wherein inner shaft
structure 16 is comprised of separate, mechanically connected
sections. Each section may have a unique stiffness, weight and
torque rating. Three separate sections 22, 23 and 24 are shown to
illustrate the present invention. With respect to the inner shaft
structure 16, section 22 is typically referred to as the tip
section; section 23 is often referred to as the mid section and
section 24 is often referred to as the butt section. Fewer or
additional sections are within the scope of the present invention.
Both the outer shaft structure 18 and inner shaft structure 16 may
be formed from various materials such as graphite, ferrous and
non-ferrous metals, plastics and the like. Those skilled in the art
will recognize that a multitude of material can be used for both
the inner shaft structure 16 and outer shaft structure 18 and using
other materials does deviate from the spirit or scope of the
present invention.
[0052] The variable bending profile of the overall shaft structure
12 includes the variable bending properties of both the inner shaft
structure 16 and outer shaft structure 18 working in tandem. The
overall bending profile of outer shaft 18 is substantially constant
while the overall bending profile of the inner shaft structure 16
is modifiable by virtue of the stiffness contributions of each of
the sections 22, 23 and 24.
[0053] The overall weight of shaft structure 12 includes weight of
the outer shaft structure 18, which may be substantially constant,
as well as the overall configurable weight contributed by assembled
sections 22, 23 and 24 that define the inner shaft structure
16.
[0054] The moment-of-inertia of shaft structure 12 and as well the
golf club 10 itself, includes the moment-of-inertia of the outer
shaft structure 18, which is substantially constant, as well as the
total configurable moment-of-inertia as contributed by the
distribution of weight of assembled sections 22, 23 and 24 that
define the inner shaft structure 16.
[0055] The overall shaft structure 12 is detachably affixed at one
end of a conventional club head 30 (not detailed structurally) and
at the opposite end with a circumferentially extending,
conventional golf grip 25 (not detailed structurally).
[0056] With reference to FIG. 7, the proximal end of the mid
section 23 is detachably engaged with coupler 26 and with coupler
31 at the distal end of the mid section 23. Tip section 22 may be
detachably engaged at the proximal end of the tip section 24 with
coupler 31 and by coupler 50 at the distal end of tip section 24.
Inner shaft structure 16 is held in place at the distal end by the
cooperative engagement of coupler 50. Those skilled in the art will
recognize and appreciate that a plurality of sections as well as a
plurality of different types of coupling devices can be
incorporated and that such an arrangement does not deviate from the
scope and the spirit of the present invention. Mechanical
connection of the individual sections occurs via a quick disconnect
coupler.
[0057] Spacers 15, 17 and 19 of section 22, 23 and 24 respectively
serve to support inner shaft structure 16 relative to outer shaft
structure 18 at strategic locations. The number and placement of
spacers 15, 17 and 19 are defined so as to transfer the distinct
bending pattern of the outer shaft structure 18, when under load,
to the inner shaft structure 16. In this manner inner shaft
structure 16 is then able to influence the bending profile of the
overall shaft structure 12 by virtue of its configurable
arrangement. Additionally, the length of tip section 22, mid
section 23 and butt section 24 can be chosen to advantageously
place the kick-point anywhere along the shaft. For instance, in
addition to the stiffness chosen for mid section 23 mid section 23
can be configured to be exceptionally long with spacers 17 located
near the ends of mid section 24 so that maximum bending would occur
at mid shaft thereby creating a mid kick-point.
[0058] FIG. 8 reveals a typical quick disconnect coupler 35.
Locking mechanism 35 including locking tab 36 cooperating with
loading spring 37. Loading spring 37 is located within channel 38.
As an example, during assembly of mid section 23 with butt section
24, the golfer introduces the male coupling device 28 to the female
coupling device 29. Pushing down firmly causes locking tab 36 of
locking mechanism 35 to retract into channel 38 thusly loading
spring 37 and allowing cross member 34 to fully engage female
coupling device 29. The pushing action causes locking tab 36 of
locking mechanism 35 to retract into channel 38 thus granting the
ability to fully insert male cross member 34 of male coupling
device 28 into female coupling device 29. Both male coupling device
28 and female coupling device 29 become fully engaged when locking
tab 36 of locking member 35 protrudes past the bottom of female
coupling device 29. At this time, locking tab 36 springs back to
the initial position and the top of locking tab 36 engages the
bottom of female coupling device 29 thereby creating a detachable
rigid and firmly affixed structural connection. Conversely, upon
disassembly, the golfer inserts special tool 50 into acceptance
hole 52. Upon activation of the tool, scrawl end 54 inserts into
acceptance hole 52 and reaches locking tab 36. Further prosecution
of the scrawl end 54 inward causes locking tab 36 to retract into
channel 37 thereby compressing spring device 37. When locking tab
36 is fully retracted into channels 38 the golfer is than able to
disconnect mid section 23 from butt section 24.
[0059] FIG. 9 depicts a typical mid section 23 that displays
markings 70 that identify the particular characteristics of
stiffness, weight and torque. The stiffness marking 72 refers to
the stiffness of mid section 23 in a 200 to 300 scale with 300
being the stiffest. The weight marking 74 refers to the overall
weight of the mid section 23 in grams, i.e. 30 grams. The torque
marking 76 of the mid section 23 is depicts as 1.0 to 5.0 scale
where 1.0 equals the lowest torque while 5.0 represents the highest
torque rating of the tip section 23. Those skilled in the art will
appreciate that any marking nomenclature such as color-coding and
other decipherable markings could be use in lieu of the enclosed
markings and that doing so will not deviate from the teachings
herein. In practice, a golfer would have a multitude of sections
22, 23 and 24 as spares and then would choose the sections that
would best obtain the performance that they are looking for.
[0060] Configuring a variable bending profile is defined by the
choice and then detachable assembly of tip section 22, mid section
23 and butt section 24. For instance, a golfer may choose a bending
profile that promotes a strong mid section 23 and butt section 24
with a weak tip section 22. This arrangement would facilitate a low
kick-point. In this manner tip section 22 would be chosen with the
lowest stiffness rating as compared to mid section 23 and butt
section 24. Mid section 23 and butt section 24 would be chosen with
a higher stiffness than tip section 22. Conversely, if a golfer
chooses to configure a bending profile with a mid kick-point then
the golfer would choose a mid section 23 with stiffness rating that
is lower than tip section 22 and butt section 24. As well choosing
a high kick-point would dictate that the golfer would choose a butt
section 24 with stiffness rating that is less than the stiffness
rating for tip sections 22 and mid section 23. It should be noted
that the overall stiffness as defined by the contribution of the
assembled tip section 22, mid section 23 and butt section 24
constitute a stiffness profile.
[0061] Additionally, in practice, the golfer would decide upon an
overall target weight of the golf shaft 12. The golfer would then
choose the weight of each section which has the required stiffness
so that the total combined weight of the assembled inner shaft
structure 16 in conjunction with the weight of the outer shaft
structure 18 would achieve the desired target weight of the overall
golf shaft 12.
[0062] In addition to choosing the correct overall weight the
golfer would also choose which section 22, 23 or 24 would
contribute the greater weight to the overall weight of the inner
shaft structure 16 such that the placement of the weight would
cause the moment-of-inertia to be to their liking. For instance, if
a golfer chooses to decrease the moment-of-inertia they would
choose a butt section 24 whose weight is greater than tip section
22 and mid section 23. Conversely, if they choose to increase the
moment-of-inertia they would necessarily choose a tip section 22
weight that is greater than mid section 23 and butt section 24
weight.
[0063] In practice and when a golfer chooses to adjust the bending
profile the golfer will first remove the inner shaft structure 16
by removing hex cap 19 via a hex wrench. Once removed the inner
shaft structure 16 is then disassembled and either/or tip section
22, mid section 23 or butt section 24 is replaced. The inner shaft
structure 16 is then placed back within the outer shaft structure
18. The hex cap 19 is then threaded back on and tightened.
[0064] Although in the preferred embodiment three sections are
shown those skilled in the art will readily recognize and
appreciate that a plurality of sections can be used and in doing so
will not deviate from the scope or the spirit of the present
invention. Those skilled in the art would also appreciate that
using a plurality of independent shaft structures would allow for a
finer tuning of the overall bending profile.
[0065] FIG. 10 reveals an alternative embodiment of the inner shaft
structure 16. Inner shaft structure 16 includes a single support
member 84 which is used to accommodate and support spacers 72, 74,
76 and 78 as well as stiffening sleeve 82 and weights 80. Support
member 84 can be chosen to achieve a certain torque rating by
virtue of the diameter and material chosen. In this embodiment, a
precise bending profile is achieved by the combination and
placement of spacers 72, 74, 76 and 78 in combination with the
placement, length and stiffness of stiffening sleeves 82. The
overall target weight of shaft 12 can be tuned by the choice of
weights 80. The moment-of-inertia can be tuned by the location of
the weights 80.
[0066] In practice, the golfer would choose the spacers 72, 74, 76
and 78 and location to affect the position of the kick-point of the
overall shaft 12. For instance, to achieve a mid kick-point spacers
72, 74 76 and 78 would be placed at the proximal end of support
member 84. To further affect the bending profile a golfer would
choose the number, length, stiffness and placement of any number of
stiffening sleeves 82 on support member 84. After placement of both
the spacers 72, 74, 76 and 78 as well as stiffening sleeve 82 a
final target weight would be achieved by virtue of weights 80. A
final moment-of-inertia would be achieved by placing the weights 80
along support member 84 to affect the choice of moment-of-inertia
required. Support spacers 72, 74, 76 and 78 are locked in place
along support member 84 by virtue of a set screw arrangement.
[0067] FIG. 11 reveals yet another embodiment of the current
invention wherein the inner shaft 16 is in direct contact with the
outer shaft 18 serving to eliminate the need for spacers 15, 17 and
19. The combination of the inner shaft 16 structure with the outer
shaft structure 18 forms in effect a complete golf shaft 12 whose
combined bending profile, wall thickness, weight and torque are
identical to a typical golf shaft 12. In this manner the bending
profile of the outer shaft 18 directly influences the inner shaft
structure 16 since the outer surface of the inner shaft structure
16 is in direct contact with the inner surface of the outer shaft
structure 18.
[0068] FIG. 12 reveals yet another embodiment of the current
invention where in lieu of spacers 15, 17 and 19 a thin layer of
fluid 32 is provided between outer shaft structure 18 and inner
shaft structure 16 in order to mechanically convey the loading of
the outer shaft structure 18 to inner shaft structure 16. Those
skilled in the art will recognize that virtually any fluid or
material can be used in lieu of fluid 32 and that in doing so does
not deviate from the spirit or intent of the current invention.
* * * * *