U.S. patent application number 09/995091 was filed with the patent office on 2003-05-29 for face-balanced golf putter.
Invention is credited to D'Eath, Roger Allen.
Application Number | 20030100380 09/995091 |
Document ID | / |
Family ID | 25541383 |
Filed Date | 2003-05-29 |
United States Patent
Application |
20030100380 |
Kind Code |
A1 |
D'Eath, Roger Allen |
May 29, 2003 |
Face-balanced golf putter
Abstract
The present invention is a golf putter having an offset shaft
and balanced putter head which enables a golfer to accurately putt
a golf ball towards a hole. The putter includes a shaft and a
putter head. The shaft defines the toe portion and a heel portion
of the putter head. The putter head includes a front surface, a
back surface, a top surface, a bottom surface, and a receptacle
defined by the putter head. The receptacle is preferably formed in
the bottom surface of the putter head and receives a corresponding
weighted plug. The center transverse axis of the weighted plug is
axially aligned with the center transverse axis of the shaft along
the longitudinal axis of the putter head to exactly balance, or at
least approximately balance, the toe and heel portions of the
putter head. The weighted plug is preferably inserted in the
receptacle to balance the golf putter. In another embodiment, the
weighted plug is attached to a surface of the putter head.
Inventors: |
D'Eath, Roger Allen; (North
Port, FL) |
Correspondence
Address: |
BELL, BOYD & LLOYD, LLC
PO BOX 1135
CHICAGO
IL
60690-1135
US
|
Family ID: |
25541383 |
Appl. No.: |
09/995091 |
Filed: |
November 26, 2001 |
Current U.S.
Class: |
473/340 |
Current CPC
Class: |
A63B 60/02 20151001;
A63B 53/0487 20130101; A63B 53/0433 20200801; A63B 2053/0491
20130101 |
Class at
Publication: |
473/340 |
International
Class: |
A63B 053/04 |
Claims
The invention is claimed as follows:
1. A golf putter comprising: a putter head having a center
transverse axis; a shaft attached to said putter head, said shaft
being offset from the center transverse axis of the putter head and
defining a toe portion having a weight and a heel portion having a
weight; and a weighted plug attached to the heel portion of the
putter head, wherein the weighted plug approximately balances the
weight of the toe portion and the weight of the heel portion of the
putter head.
2. The golf putter of claim 1, wherein the heel portion defines a
receptacle for receiving the weighted plug and the weighted plug is
secured in the receptacle.
3. The golf putter of claim 2, wherein the approximate weight of
the weighted plug is D which is calculated based on the following
formula: D=Y-(Z-C), wherein Y is the weight of the toe portion, Z
is the weight of the heel portion and C is the weight of an amount
of material of the putter head which would be needed to fill the
receptacle.
4. The golf putter of claim 1, wherein the weighted plug is
attached to a surface of the heel portion of the putter head.
5. The golf putter of claim 1, wherein the shaft and the weighted
plug are positioned on a longitudinal axis of the putter head.
6. The golf putter of claim 1, wherein the shaft and the weighted
plug are positioned on a center longitudinal axis of the putter
head.
7. The golf putter of claim 1, wherein the shaft includes a curved
portion of a predetermined length that is formed on one end of the
shaft.
8. The golf putter of claim 1, wherein the density of the material
of the weighted plug is greater than the density of the material of
the putter head.
9. The golf putter of claim 1, wherein the putter head includes a
top surface with at least one sight line for aligning the putter
head with a golf hole.
10. The golf putter of claim 1, wherein the weighted plug exactly
balances the weight of the toe portion and the weight of the heel
portion of the putter head.
11. A golf putter comprising: a putter head including a center
transverse axis and a center longitudinal axis; a shaft attached to
the putter head along the center longitudinal axis of the putter
head, said shaft being offset from the center transverse axis and
defining a transverse shaft axis, a first portion of the putter
head on one side of the transverse shaft axis and a second portion
of the putter head on the opposite side of the transverse shaft
axis; and a weighted plug attached to the second portion of the
putter head along the center longitudinal axis such that the weight
of the first portion is substantially equal to a combined weight of
the second portion and the weighted plug.
12. The golf putter of claim 11, wherein the second portion defines
a receptacle for receiving the weighted plug and the weighted plug
is secured in the receptacle.
13. The golf putter of claim 12, wherein the approximate weight of
the weighted plug is D which is calculated based on the following
formula: D=Y-(Z-C), wherein Y is the weight of the first portion, Z
is the weight of the second portion without the weighted plug and C
is the weight of an amount of material of the putter head which
would be needed to fill the receptacle.
14. The golf putter of claim 11, wherein the weighted plug is
attached to a surface of the second portion of the putter head.
15. The golf putter of claim 11, wherein the shaft includes a
curved portion of a predetermined length that is formed on one end
of the shaft.
16. The golf putter of claim 11, wherein the density of the
material of the weighted plug is greater than the density of the
material of the putter head.
17. The golf putter of claim 11, wherein the putter head includes a
top surface with at least one sight line for aligning the putter
head with a golf hole.
18. The golf putter of claim 11, wherein the weighted plug exactly
balances the weight of the first portion and the weight of the
second portion of the putter head.
19. A golf putter comprising: a putter head having a center
transverse axis; a shaft attached to the putter head, said shaft
being offset from the center transverse axis of the putter head and
defining a shaft transverse axis, a heel portion having a weight Y
on one side of the shaft transverse axis, and a toe portion having
a weight Z on an opposite side of the shaft transverse axis; a
receptacle defined by said heel portion wherein an amount of
material needed to fill the receptacle has a weight C; and a
weighted plug attached to the putter head and having a weight which
balances the weights of the toe and heel portions of the putter
head, said weighted plug having a weight approximately equal to
Y-(Z-C).
20. The golf putter of claim 19, wherein the density of the
material of the weighted plug is greater than the density of the
material of the putter head.
21. The golf putter of claim 19, wherein the putter head includes a
top surface with at least one sight line for aligning the putter
head with a golf hole.
22. The golf putter of claim 19, wherein the weighted plug exactly
balances the weight of the toe portion and the weight of the heel
portion of the putter head.
23. A method for making a golf putter, said method comprising the
steps of: (a) attaching a shaft to a putter head offset from a
center transverse axis of the putter head to define a toe portion
having a weight Y and a heel portion having a weight Z; (b)
calculating a weight D for a weighted plug to be attached to the
heel portion to balance the toe portion and the heel portion,
wherein D=Y-Z; and (c) attaching said weighted plug of weight D to
the heel portion of the putter head to face balance the golf
putter.
24. The method of claim 23, wherein the density of the material of
the weighted plug is greater than the density of the material of
the putter head.
25. The method of claim 23, which includes the step of forming at
least one sight line in a top surface of the putter head for
aligning the putter head with a desired location on a green.
Description
BACKGROUND OF THE INVENTION
[0001] Golf putting is an essential part of any golfer's game. For
many golfers, putting is the most difficult aspect of the game.
Putting greens vary in dampness, softness, length and texture of
grass, and several other factors that affect a putt. All putting
greens are different, and therefore a golfer must adjust to each
green. Additionally, a golfer's own putting stroke may vary and
affect the alignment and accuracy of the golfer's putts. As a
result, golf club manufacturers have designed several different
styles and types of golf putters to help golfers overcome their own
putting deficiencies as well as other difficulties of putting.
[0002] Putting performance greatly depends on a golfer's ability to
correctly align the putter with a hole and then hit the golf ball
effectively and sufficiently so that the golf ball travels the
correct distance to the hole. The angle of the shaft and the weight
balance of the putter head are two factors that affect a golfer's
putting stroke and follow-through. Thus, golf putter designs have,
in part, focused on the angle of the golf putter shaft and on the
weight distribution in the golf putter head.
[0003] The angle of the golf putter shaft is one factor that
affects the alignment and control of the putter. The optimum angle
is zero degrees, or no angle, between the shaft and the vertical
axis. In this case, the shaft is attached directly to the center of
the putter head and extends straight up from the head or along the
vertical axis from the center of the putter head. This style of
golf putter enables a golfer to have substantial control over a
putt because the straight, centered shaft improves the golfer's
balance and control over the putter. This style of putter, however,
enables a golfer to have too much control of a putt and the
accuracy of the putt. Therefore, to make putting more difficult and
to increase the use of a golfer's skill to make a putt, the United
States Golfer's Association (USGA) formed rules that govern the
shaft design of a putter as well as other parts of the putter such
as the putter head. According to USGA rules, the projection of the
straight part of the putter shaft must diverge from the vertical
axis by at least ten degrees. Several known putter designs have
accordingly altered the angle between the putter shaft and the
vertical axis that extends from the center of the putter head.
Thus, golfers must adjust their putting stance and strokes based on
the slanted shaft designs required by the USGA rules.
[0004] The weight distribution or balance of the putter head also
affects a putt. Generally, there are three types of balance
associated with the weight distribution of a putter. Putters are
generally toe-weighted, face-balanced or somewhere between
toe-weighted and face-balanced. These design terms refer mainly to
the putter head. If a person lays a putter on a table and the toe
portion of the putter head hangs straight down while the heel
portion is pointing up, the putter is considered toe-weighted.
Toe-weighted putters are typically better for golfers who have a
putting stroke that moves in a gentle arc around the golfer's body
because a toe-weighted putter closes the angle of the putter face
as it moves through a putting stroke. Thus, a golfer who has a
pendulum style, or back and forth stroke, will be less likely to
contact or hit a golf ball in the "sweet spot," or optimum spot, of
the golf ball during a putt using a toe-weighted putter. The golfer
will more likely hit the ball off center instead, which causes
excessive face movement across the face or front surface of the
putter head. Excessive face movement causes a putted ball to travel
off target and miss the hole.
[0005] A face-balanced putter employs an even and uniform weight
distribution about the vertical axis formed by the putter shaft.
The weight distribution of a face-balanced putter is uniform
because the weight of the toe and heel portions of the putter head
are approximately equal. Generally, golfers that have pendulum-like
putting strokes will benefit from face-balanced putters because the
even weight distribution of the putter head maintains a square and
fluid putting stroke through the impact of the golf ball.
Therefore, a face-balanced putter is more likely to contact a golf
ball squarely and direct the ball towards a hole based on the
alignment of the putter with the hole.
[0006] The remaining types of balance use putter heads and shaft
designs that create a putter that falls between the face-balanced
position and the toe-weighted position. The intermediate balanced
putters are balanced so that the face of the putter head ranges
from fifteen to eighty degrees from the horizontal axis when the
putter is laid upon a flat surface. These putters are used by
golfers having various putting styles and strokes.
[0007] Examples of such putter designs are provided in U.S. Pat.
Nos. 5,603,666; 5,795,239; and 6,083,115. U.S. Pat. No. 5,603,666,
entitled "Golf Putter," which issued on Feb. 18, 1997, discloses a
golf putter having an adjustable shaft and weighting system. The
shaft is adjustable using three set screws 36 and 38 which tighten
the end of the shaft that is inserted into the putter head. The
putter is adjustable by filling bore receptacles, which are aligned
perpendicular to the swing path of the putter, with steel balls.
The bore receptacles contain screws 36 and are sealed at the toe
and heel portions of the putter head with plugs. The weights in the
weighting system are mounted on both sides of the putter head and
on both sides of the shaft. The weights are said to enable a golfer
to alter the weight distribution of the putter to accommodate
different putting strokes and styles.
[0008] U.S. Pat. No. 5,795,239, entitled "Golf Putter," which
issued on Aug. 18, 1998 discloses an improved putter design for
increasing putting accuracy. The increase in putting accuracy is
accomplished by aligning the center of gravity of the putter with
the swing path and striking point of the putter head. Aligning the
center of gravity is said to reduce the putter head rotation when
the ball is not contacted directly with the center of the putter
head. An adjustable counter weight and specifically, a weighted
screw, is incorporated into the front surface of the putter head.
The counter weight may be adjusted to suit the preferences of a
user. The putter further includes a removable putting surface and
shaft.
[0009] U.S. Pat. No. 6,083,115, entitled "Golf Putter," which
issued on Jul. 4, 2000 discloses a putter including a weight member
positioned directly behind the front surface or putting surface of
the putter. The weight member has a center of gravity in front of
the longitudinal axis of the putter head that extends from the toe
portion to the heel portion of the putter. The positioning of the
weight member is said to improve the follow-through of a golfer's
stroke during a putt. However, this putter design creates an uneven
weight distribution between the front and back surfaces of the
putter head. The weighting member may be replaceable with other
weights to accommodate the putting preferences of different
golfers.
[0010] The above described patents generally disclose how to change
the weight of a putter to accommodate a golfer's comfort and feel
of a putter during a golf stroke, but do not disclose a
face-balanced putter. U.S. Pat. No. 3,954,265, entitled "Balanced
Golf Club," which issued on May 4, 1976 disclose a face-balanced
putter. The putter includes a shaft and head where the shaft has
compound reverse curves 25 and 26 located above the attachment
point to the head. The putter head 11 is positioned on the end of
the shaft 12 so that the putter head and shaft are approximately
balanced. The putter is balanced at a point 31 that is adjacent to,
but spaced from, the putter head. This putter does not balance the
putter head itself and does not use weights or other attachments to
evenly distribute the weight in the putter head.
[0011] As indicated above, face-balanced putters enable certain
golfers to level their putting stroke and to consistently and
accurately hit a golf ball during a putt. As a result, golfers can
improve their putting skills and increase their level of enjoyment
with the game of golf. Existing face-balanced putters, however, use
curved shafts or a similar shaft configuration to adjust the
balance point of the putters. These types of putters are difficult
to balance because the curve of the putter shaft and the attachment
point of the shaft must be repeatedly adjusted until the proper
balancing is achieved. Therefore, there is a need for an improved
golf putter which balances the putter head and enables golfers to
consistently and accurately putt golf balls.
SUMMARY OF THE INVENTION
[0012] The present invention provides a face-balanced golf putter
having a putter head, a shaft attached in an offset position along
the longitudinal axis of the putter head and a weight or weighted
plug positioned along the longitudinal axis of the putter head to
provide golfers with the maximum moment during a putting stroke.
The face-balanced golf putter of the present invention enables a
golfer to consistently and accurately putt a golf ball to a desired
location such as a hole. The golf putter of the present invention,
which is alternatively referred to as a putter, includes a shaft, a
putter head and at least one balancing weight or weighted plug
having the exact weight necessary to face balance the putter head,
based on the dimensions of the putter head, the shape of the putter
head, the material of the putter head and the position of the
shaft.
[0013] In one embodiment, the shaft is inserted into the top of the
putter head along the longitudinal axis of the putter head.
Alternatively, the shaft may be attached to the putter head using
any suitable conventional fastening methods. The shaft is
preferably cylindrically shaped and is positioned on the
longitudinal axis offset from the center transverse axis. A
conventional grip is attached to the opposite end of the shaft. The
grip is adapted to be grasped by the golfer to provide better
handling and control of the shaft. The weighted plug is attached to
or inserted in the putter head to evenly distribute the weight
between the toe and heel portions of the putter head. The
face-balanced putter thus enables a golfer to squarely contact a
golf ball and to adjust the follow-through of the golfer during a
putting stroke to accurately hit and direct the golf ball towards a
desired location such as a hole.
[0014] More specifically, the putter head includes a body having a
top surface or top, a bottom surface or bottom opposite the top
surface, a front surface or face which laterally extends between
the top surface and the bottom surface, and a back surface or back,
opposite the front surface and laterally extending between the top
surface and the bottom surface of the head. The outer end or
portion of the putter head that does not include the shaft is
generally referred to as the toe portion, and the fixed end or
portion of the head to which the shaft is attached is generally
referred to as the heel portion.
[0015] In one embodiment, the putter head defines a receptacle in
the heel portion (i.e., on the same side as the offset shaft). The
receptacle extends from the bottom surface vertically upwardly
inside the heel portion of the head. The receptacle is positioned
on the same longitudinal axis of the putter head as the shaft. The
receptacle is suitably sized and shaped to receive at least one
weighted plug, which balances or equalizes the weight of toe and
heel portions of the putter head.
[0016] The weighted plug is inserted into and secured in the
receptacle and provides the exact amount of weight to the heel
portion of the putter head to counterbalance or offset the weight
of the toe portion. Thus, the weight of the weighted plug depends
on the factors listed above as well as the style and type of golf
putter. Accordingly, it should be appreciated that the exact weight
of the plug must be specifically calculated for each putter type
and that the density of the weight or weighted plug will be greater
or substantially greater than the density of the material used for
the putter head. The weight of the putter head is also preferably
distributed directly on the same longitudinal axis as the shaft.
Accordingly, the present invention provides a face-balanced putter,
which is balanced in two different directions, between the front
and back surfaces of the putter head and between the toe and heel
of the putter head. The balancing of the putter head in two
directions is achieved because the weighted plug is centered on the
same longitudinal axis as the center of the offset shaft and the
weighted plug provides the exact or approximately exact weight
necessary to balance the toe and heel portions of the putter head
along the longitudinal axis and perpendicular or transverse to that
axis.
[0017] In another embodiment, the putter head includes sight lines,
which aid a golfer in lining up a putt with a desired location such
as a hole. The sight lines are formed in the top surface of the
putter and are viewable from above by a golfer. Preferably, the
sight lines are lines formed across the top surface of the putter
head and are substantially perpendicular or transverse to the front
and back surfaces of the head.
[0018] It is therefore an advantage of the present invention to
provide a golf putter having an offset shaft and a center aligned
weight positioned in the putter head that face-balances the
putter.
[0019] Another advantage of the present invention to provide a golf
putter having an offset shaft and a weight that is inserted into a
putter head to exactly balance the toe and heel portions of the
putter head.
[0020] A further advantage of the present invention is to provide a
golf putter having a putter head that maximizes the moment during a
putting stroke.
[0021] Another advantage of the present invention is to provide a
golf putter having a putter head that enables a golfer to
consistently and accurately direct a golf ball during a putt.
[0022] Additional features and advantages of the present invention
are described in, and will be apparent from, the following Detailed
Description of the Invention and the figures.
BRIEF DESCRIPTION OF THE FIGURES
[0023] FIG. 1 is a perspective view of one embodiment of the
present invention illustrating a golf putter having a putter head
with a v-shaped bottom surface and an offset shaft mounted to the
putter head.
[0024] FIG. 2 is an exploded perspective view of the golf putter of
FIG. 1 illustrating the weighted plug removed from the putter head
and the position and location of the receptacle (shown in phantom)
in the putter head which receives the weighted plug.
[0025] FIG. 3 is a front elevation view of the golf putter of FIG.
1 illustrating the weighted plug (shown in phantom) in the putter
head.
[0026] FIG. 4 is a top view of the golf putter of FIG. 1
illustrating the offset shaft insertion point and the weighted plug
(shown in phantom) in the putter head aligned along the center
longitudinal axis of the putter head.
[0027] FIG. 5 is an elevation view of the back side of the golf
putter of FIG. 1 illustrating the offset shaft (partially in
phantom) and the weighted plug (in phantom).
[0028] FIG. 6 is a schematic view of a center-shaft putter
illustrating the weight of the toe portion, A, and the weight of
the heel portion, B, of the putter head.
[0029] FIG. 7 is a schematic view of an offset shaft putter
illustrating the weight of the toe portion, A+X, and the weight of
the heel portion, Z.
[0030] FIG. 8A is schematic view of the present invention shown in
FIG. 1 illustrating the weight of the toe portion, A+X, the weight
of the heel portion, Z-C, and a weight C which is the weight of the
material removed to form the receptacle in the heel portion of the
present invention.
[0031] FIG. 8B is a schematic view of the present invention shown
in FIG. 1 illustrating the weight of the toe portion, A+X, the
weight of the heel portion, (Z-C), and a weight D which is the
weight of the weighted plug.
[0032] FIG. 9 is a side perspective view of the golf putter of FIG.
1 positioned on a level table top illustrating the face-balanced
feature of the present invention.
[0033] FIG. 10 is a perspective view of another embodiment of the
present invention illustrating the weighted plug inserted in the
top surface of the body of the putter head.
[0034] FIG. 11 is a perspective view of another embodiment of the
present invention illustrating the weighted plug attached to a
surface of the heel portion of the putter head.
[0035] FIG. 12 is a top view of another embodiment of the present
invention illustrating sight lines formed on the top surface of the
putter head.
DETAILED DESCRIPTION OF THE INVENTION
[0036] The face balanced golf putter of the present invention
enables a golfer to more accurately and consistently putt a golf
ball. Generally, putter heads are not evenly weighted. The toe
portion of the putter head is typically heavier than the heel
portion of the putter head because the putter shaft is mounted in
an offset position closer to the heel of the putter head than the
toe of the putter head. The offset shaft is the pivoting axis for
the putter head and thus, the putter head naturally turns or pivots
towards the heavier toe portion of the head. Therefore, the weight
of the toe portion pulls the face or front surface of the putter
head inward and causes uneven contact between a golf ball and the
front surface of the putter head during a putt.
[0037] In one embodiment, the present invention eliminates the
uneven weight distribution between the toe and heel portions caused
by or defined by the position of the offset shaft by positioning a
relatively heavy weight or weighted plug in the heel portion of the
putter head. The weighted plug increases the weight of the heel
portion of the putter head so that the weight of the heel portion
exactly or approximately equals the weight of the toe portion of
the putter head. The weight of the weighted plug is specifically
determined based on the material of the putter, the dimensions or
size of the putter, the shape of the putter head, the style and
type of the putter head and the offset position of the putter
shaft. Furthermore, the weighted plug is centered and positioned on
the longitudinal axis of the putter head that passes through the
center of the offset shaft. Thus, the weights of the toe and heel
portions of the putter head are exactly equal or approximately
equal, and balanced along the longitudinal axis and perpendicular
to that axis, to enable a golfer to consistently and accurately
putt a golf ball.
[0038] Referring now to FIGS. 1 through 5, a golf putter of one
embodiment of the present invention is shown and generally
designated by numeral 50. Throughout the description, the golf
putter 50 will be alternately referred to as the golf club putter
or the putter. The golf putter 50 generally includes: a shaft 60
for holding and controlling the putter; a putter head 62 mounted to
one end of the shaft 60 for aligning and contacting a golf ball and
a weight or weighted plug 88 for balancing the head 62.
[0039] The putter head 62 includes a toe portion 64 and a heel
portion 66. For purposes of this application, the toe portion is
generally the outer portion of the head 62 that does not include
the shaft. The heel portion 66 is generally the inner portion of
the head 62 to which the shaft is attached. In the illustrated
embodiment, the head includes an elongated top surface or top 68
and a v-shaped bottom surface or bottom 70 that is opposite to the
top surface 68. It should be appreciated that the bottom surface
and other surfaces may be any suitable shape. The bottom surface 70
faces downward and is the closest surface to the ground when a
golfer is putting a golf ball. The bottom or bottom surface 70
includes in one embodiment a sole portion 80, which is made of a
suitable durable material such as stainless steel. The sole portion
80 is v-shaped and conforms to the bottom surface 70. The v-shaped
design enables a golfer to pivot the golf putter 50 to adjust the
positioning of the putter with respect to the golf ball and
minimizes the friction between the bottom contact surface of the
putter and the ground during a putt. It should be appreciated that
the putter head itself may be made with any suitable material.
[0040] A front surface or front 72 extends laterally downward from
one edge of the top surface 68 and is connected to the top surface
68 to the bottom surface 70. The front surface 72 is the
forward-facing surface or face of the putter head 62, which
contacts or impacts a golf ball during a putt. A back surface or
back 74 extends laterally downward from the edge of the top surface
68 that is opposite to the front surface 72, and is connected to
the top surface 68 with the bottom surface 70.
[0041] A receptacle 78 is defined by the putter head. In one
embodiment, the receptacle 78 is formed in the bottom surface 70 of
the heel portion of the putter head 62 and extends upwardly from
the bottom surface 70 towards the top surface 68. It should be
appreciated that the receptacle 78 may be formed in the top surface
68 and extend downwardly into the putter head as illustrated in
FIG. 10 and described below. Preferably, the receptacle 78 does not
extend completely through to the top surface of the putter head 62.
In one embodiment, the receptacle 78 is cylindrically shaped and
has an opening adapted to receive a similarly shaped weight or
weighted plug 88. It should be appreciated that the weighted plug
88 and the receptacle 78 may be any suitable shape. The receptacle
78 is formed in the heel portion 66 of the putter head 62 to
balance the weight of the putter head 62 as further described
below. It should be appreciated that the weight or weighted plug is
positioned so that the plug surface is flush or even with the
corresponding surface of the putter head. In order to create an
equally balanced putter head, the receptacle 78 is directly aligned
along the center longitudinal axis of the head. The shaft is also
aligned along the center longitudinal axis. This alignment along
the longitudinal axis also works to achieve an exactly or
substantially equal weight balance between the toe portion 64 and
the heel portion 66 of the putter head 62. The weighted plug 88 is
shaped similarly to the shape of the receptacle 78 so that the
weighted plug 88 may be inserted into and secured in the receptacle
78. In one embodiment, the diameter of the weighted plug 88 is
approximately the same diameter of the receptacle 78 so that the
weighted plug 88 fits securely into the receptacle 78. In another
embodiment, the receptacle 78 and the weighted plug 88 are threaded
so that the weighted plug may be screwed into the receptacle 78. It
should be appreciated that any suitable fastening methods may be
used to secure the weighted plug 88 into the receptacle 78.
[0042] As indicated above, the weight of the weighted plug 88 is
based on the putter head size, shape and material in addition to
the position of the shaft as described below. The weighted plug 88
is preferably made of a suitable durable material such as metal,
and in one embodiment is made of Tungsten which has a greater
density than other materials. In one example embodiment, the total
weight of the head is 335 grams and the weight of the plug is
approximately 70 grams to properly balance the weight between the
heavier toe portion of the putter head 62 and the heel portion. The
density of the material that forms the weighted plug is preferably
greater than or substantially greater than the density of the
material that forms the putter head. The density and positioning of
the weighted plug 88 in the receptacle 78 on the heel portion 66 of
the putter head 62 enables the weight of the weighted plug 88 to
balance or counteract the weight of the generally larger toe
portion 64 of the putter head about the axis created by the shaft
60 as further discussed below. Preferably, the weighted plug 88 is
inserted so that the center transverse axis 86 of the weighted plug
88 is parallel to the center transverse axis 94 of the shaft 60. It
should be appreciated, however, that the weighted plug 88 may be
positioned at any angle desired inside the putter head provided
that the center of the weighted plug is positioned on the
longitudinal axis of the putter head.
[0043] The sole portion 80 is formed on the bottom surface 70 of
the putter head 62 to protect the putter head 62 from damage and
enable a golfer to adjust the position of the putter. Also, the
sole portion reduces the friction of the putter with the ground
during a putting stroke because the v-shaped sole reduces the
surface area that contacts the ground during a putt. The sole
portion 80 is preferably made of a durable material such as
stainless steel. However, it should be appreciated that any
suitable material may be used to form the sole portion 80. The sole
portion 80 is preferably integrally formed with the bottom surface
70 of the putter head. It should be appreciated that the sole
portion 80 may also be a separate component that is secured to the
bottom surface 70 using suitable fasteners. Preferably, the sole
portion evenly distributes weight about the transverse axis 84 such
that the weighted plug 88 does not need to compensate for the sole
portion.
[0044] The shaft 60 is in one embodiment cylindrically shaped and
is connected to the putter head 62 at an offset position from the
center of the top surface 68 of the putter head. In one embodiment,
the shaft 60 is inserted into the putter head 62. It should be
appreciated that the shaft may be made of any suitable material. It
should also be appreciated that the shaft may be formed into any
suitable shape or size that complies with the USGA rules. The shaft
is offset from the center of the top surface 68 of the putter head
62 and extends upwardly and backwardly away from the insertion
point on the putter head as illustrated in FIGS. 1, 2, 3 and 5. It
should be appreciated that the angle formed between the shaft and
the transverse axis that extends from the center of the putter head
is equal to or greater than the angle specified by the USGA rules.
In one embodiment, the shaft 60 includes a grip 61, as shown in
FIG. 9, to help a golfer further control the putter during a putt.
The grip is preferably made of rubber or similar material and
enables a golfer to grasp and handle the shaft 60. The grip may be
made out of any suitable material as desired by the
manufacturer.
[0045] The offset nature of the shaft 60 causes the weight of the
toe and heel portions of the putter head to be unequal. Typically,
the unevenly weighted putter head causes the putter head to be
toe-weighted as described in detail above and makes a golfer have a
less consistent and accurate putting stroke. The shaft 60 forms the
transverse axis 94 of the putter about which the weight of the toe
and heel portions of the putter head act or pivot. Thus, the forces
caused by the weight of the toe and heel portions of the putter
head 62 cause the putter head to rotate about the transverse axis
formed by the shaft. The present invention provides the weighted
plug 88 in the heel portion of the putter head and centered along
the same longitudinal axis as the center of the insertion point of
the offset shaft to exactly, substantially or approximately balance
the toe and heel portions of the head. Therefore, the putter is
exactly, substantially or approximately balanced about the vertical
axis 94 of the shaft. It should be appreciated that the weight
distribution between the toe and heel portions of the putter head
will change based on the positioning of the offset shaft on the
putter head.
[0046] As indicated above, the weight of the weighted plug 88 will
vary based on the type, size and style of putter as well as the
position of the shaft on the putter head. The weight of the
weighted plug 88 is selected based on the amount of weight that is
needed to exactly balance the weight of the heel portion 66 with
the weight of the toe portion 64 of the putter head about the
offset shaft axis.
[0047] The facially-balanced putter head 62 of the present
invention evenly distributes the weight between the toe portion and
the heel portion about the offset shaft axis using the weighted
plug 88 so that the stroke direction of the front surface 72 is
perpendicular to the contact point of the golf ball. Thus, a golfer
will regularly strike or contact the golf ball evenly and squarely
and thereby enables the golfer to consistently and accurately aim
and hit a golf ball towards a desired location such as a hole on a
green.
[0048] The face-balanced putter 50 also enables a golfer to have a
more uniform and consistent putting motion. Because the putter head
62 is evenly weighted, the putter will not move or change angles
during the motion of the golfer's putting stroke. Therefore, a
golfer can make adjustments and align the putter head 62 with a
desired area or hole and accurately direct the golf ball to that
desired location with a consistent and fluid putting motion.
[0049] Referring now to FIG. 6, a schematic of a golf putter 50 is
illustrated where the putter head 62 includes a toe portion 64 and
a heel portion 66. In this example, the weight of the toe portion
is designated by the letter A and the weight of the heel portion is
designated by the letter B. The putter shaft 60 is attached to the
center of the top of the putter head 62. The transverse axis 94 of
the shaft 60 is exactly aligned with the transverse axis 84 that
extends from the center of the putter head. The transverse axis 94
formed by the shaft 60 divides the putter head 62 into two halves
so that the size and shape of the toe portion 64 is approximately
equal to the size and shape of the heel portion 66. The toe and
heel portions of the putter head 62 are made from the same material
and therefore the weight A of the toe portion is approximately
equal to the weight B of the heel portion. The putter head 62 is
balanced about the center transverse axis 84 because weight A
equals weight B. The weight distribution of the putter head 62
becomes unequal, however, when the shaft 60 is offset or attached
to the putter head at a different point than the center point shown
in FIG. 6.
[0050] Referring now to FIG. 7, in this embodiment, the shaft 60 is
attached to the putter head 62 at a point that is offset from the
center transverse axis of the putter head. The center transverse
axis 84 extends from the center of the putter head 62. The shaft
transverse axis 94 is the axis extending from the center of the
insertion point of the shaft 60 in the putter head. The shaft
transverse axis 94 is the point about which the putter head pivots
or rotates based on the weight distribution between the toe and
heel portions of the putter head. In FIG. 6, the shaft transverse
axis 94 of the shaft is equal to the center transverse axis 84 of
the putter head and therefore, the weights A and B of the toe and
heel portions balance about the shaft axis (i.e., A=B). In FIG. 7,
the shaft transverse axis 94 and the center transverse axis 84 are
not in the same location on the putter head. The offset shaft 60,
thus, causes the putter head 62 to be unevenly divided where the
toe portion 64 is larger than the heel portion 66. Now, the toe
portion 64 includes the weight A of the original toe portion shown
in FIG. 7, plus an additional weight X, which represents the extra
weight of the toe portion that was created when the shaft 60 was
offset from the center transverse axis of the putter head. Now the
combined or total weight of the toe portion 64, weight A plus
weight X (i.e., Y), is greater than the new weight Z of the heel
portion 66 (i.e., (A+X)>Z). Also note that X plus Z equals A.
The heavier toe portion 64 causes the angle of the putter head 62
to close during a putting stroke and increases the likelihood that
a golfer will not squarely contact a golf ball during a putt.
[0051] One embodiment of the present invention is schematically
illustrated in FIGS. 8A and 8B, where the weighted plug 88 having a
weight D is inserted and attached to the putter head 62 to add
weight to the heel portion 66 and balance the putter head. As
described above, a receptacle 78 is formed in the bottom surface of
the putter head 62 so that the weighted plug 88 (shown in FIG. 8B)
may be inserted into the head. The weight of the removed material
to form the receptacle in the heel portion 66 of the putter head is
represented by the letter C. Because material is removed from the
putter head 62, the weight of the heel portion 66 becomes (Z-C),
which is the weight of the heel portion Z minus the weight of the
removed portion C. Therefore, to balance the putter head 62, the
weight D of the weighted plug 88 shown in FIG. 8B, must be
sufficient to add enough weight to the weight (Z-C) of the heel
portion to equal the weight of the toe portion 64, which is A+X.
Thus, the putter head in the present invention balances where the
weight of the toe portion, A+X, equals the weight of the heel
portion, Z-C+D (i.e., A+X=(Z-C)+D.)
[0052] The weight D of the weighted plug 88, thus, must equal the
weight of the toe portion (A+X) minus the weight of the heel
portion (Z-C). Thus, the total weight D of the weighted plug 88 is
generally calculated using the following formula: D=(A+X)-(Z-C).
The density of the material that forms the weighted plug 88 is
therefore preferably greater than the density of the material that
forms the putter head. It should be appreciated that D=Y-(Z-C),
where Y is the weight of the toe portion, Z is the weight of the
heel portion, and C is the weight of the removed portion of the
body of the putter head, if any.
[0053] Referring to FIG. 8B, the weighted plug 88 is positioned on
the putter head 62 so that the transverse axis 86 extending from
the center of the plug 88 is on the same longitudinal axis as the
transverse axis 94 of the offset shaft 60 (as illustrated in FIG.
4). The alignment of the transverse axes of the shaft and the
weighted plug enables the present invention to exactly balance the
weight between the toe and heel portions of the putter head in two
directions. If the weighted plug 88 or the shaft 60 are slightly
off center and shift towards the front or back of the putter head
62, the weight distribution between the front and back surfaces
becomes uneven and causes the putter head to be unbalanced along
the axis that is perpendicular to the longitudinal axis of the
putter head. Therefore, to exactly balance the toe and heel
portions of the putter head in two directions, the center
transverse axis 86 of the weighted plug 88 must be aligned on the
same longitudinal axis as the center of the shaft.
[0054] Referring now to FIG. 9, the golf putter of the present
invention is shown lying on a table 90. The front surface or face
72 of the putter head 62 is facing upward away the table 90. This
is known as a face-balanced putter. The weight of the toe portion
64 and the heel portion 66 of a putter head 62 balance about the
center transverse axis of the offset shaft due to the insertion of
the weight or weighted plug (not shown) in the heel portion of the
putter head. Therefore, the face or front surface 72 of the
face-balanced putter head is parallel to the ground and faces
upward.
[0055] Referring now to FIG. 10, a further embodiment of the
present invention is illustrated where the golf putter 50a of the
present invention includes a weighted plug 88a that is inserted and
attached to the top 68 of the putter head 62a. The center
transverse axis 86 of the weighted plug 88a is positioned along the
same longitudinal axis 79 as the center transverse axis 84 of the
offset shaft 60. In this position, the weighted plug 88a adds
exactly, substantially or approximately the necessary amount of
weight to the heel portion 66 to balance the toe and heel portions
of the putter head. It should be appreciated that the weighted plug
may be positioned on the toe portion of the putter head where the
shaft is offset to the toe portion side of the center transverse
axis of the putter head.
[0056] Referring now to FIG. 11, another embodiment of the present
invention is illustrated where the golf putter 50b includes a
weighted plug 88b that is attached to the exterior surface of the
heel portion of the putter head 62. In this illustration, the
weighted plug 88b is attached to the end surface 75 of the heel
portion of the putter head. To exactly, substantially or
approximately balance the toe and heel portions of the putter head,
the weighted plug 88b is positioned such that the center of the
weighted plug (i.e. which in this example is the center
longitudinal axis) is parallel to and in the same plane as the
longitudinal axis 79 that intersects the center transverse axis 94
of the shaft 60. It should be appreciated that the weighted plug
88b may also be positioned on the top and bottom surfaces of the
putter head.
[0057] Referring now to FIG. 12, another embodiment of the golf
putter 50c of the present invention is illustrated where the putter
head 62c includes sight lines 92. The sight lines 92 are etched or
formed in the top surface 68c of the putter head 62c. One or more
sight lines may be formed in the putter head 62c as desired by the
manufacturer. It should be appreciated that the sight lines may be
lines, circles or any other suitable shape that enables a golfer to
align a putt with a hole. The sight lines 92 enable a golfer to
better align and adjust the front surface 72c of the putter head
62c to face a desired putt location or hole. In this manner, the
golfer will be able to contact and direct a golf ball to a desired
location on a green.
[0058] It should be understood that various changes and
modifications to the presently preferred embodiments described
herein will be apparent to those skilled in the art. Such changes
and modifications can be made without departing from the spirit and
scope of the present invention and without diminishing its intended
advantages. It is therefore intended that such changes and
modifications be covered by the appended claims.
* * * * *