U.S. patent application number 11/573441 was filed with the patent office on 2009-02-26 for golf-bat for centrifugal golf swing.
Invention is credited to Hang-Bok Lee.
Application Number | 20090054171 11/573441 |
Document ID | / |
Family ID | 35967665 |
Filed Date | 2009-02-26 |
United States Patent
Application |
20090054171 |
Kind Code |
A1 |
Lee; Hang-Bok |
February 26, 2009 |
GOLF-BAT FOR CENTRIFUGAL GOLF SWING
Abstract
A golf swing practice bat is provided. The bat includes a barrel
(10), a stop (20), and a grip portion (30). The barrel (10) is
disposed on one end of a stick-shaped body of a predetermined
length (a), and has an equal diameter from the end down which
narrows in diameter toward its base and a trajectory indicator
(11). The stop (20) has a predetermined width to rest an outer edge
of a left hand on. The grip portion (30) is disposed between the
barrel (10) and the stop (20). When practicing golf swings using
the bat, a user benefits from the proper grip positioning structure
of the bat, can execute a forceful swing without excessive gripping
force for less stiffness in the arms, and can visually check swing
trajectory using the trajectory indicator (11) to achieve a
powerful, centrifugal, textbook swing.
Inventors: |
Lee; Hang-Bok; (Seoul,
KR) |
Correspondence
Address: |
IPLA P.A.
3580 WILSHIRE BLVD., 17TH FLOOR
LOS ANGELES
CA
90010
US
|
Family ID: |
35967665 |
Appl. No.: |
11/573441 |
Filed: |
August 10, 2005 |
PCT Filed: |
August 10, 2005 |
PCT NO: |
PCT/KR05/02589 |
371 Date: |
February 8, 2007 |
Current U.S.
Class: |
473/203 ;
473/257 |
Current CPC
Class: |
A63B 2071/0625 20130101;
A63B 2071/0694 20130101; A63B 59/50 20151001; A63B 2071/0627
20130101; A63B 2102/32 20151001; A63B 69/3623 20130101; A63B 15/00
20130101; A63B 2102/00 20151001 |
Class at
Publication: |
473/203 ;
473/257 |
International
Class: |
A63B 69/36 20060101
A63B069/36 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 26, 2004 |
KR |
10-2004-0067473 |
Claims
1. A centrifugal golf swing practice bat for practicing a golf grip
and a swing position, comprising: a barrel disposed on one end of a
stick-shaped body of a predetermined length, the barrel having an
equal diameter from an end thereof downward and narrowing in
diameter toward a base thereof; a stop of an asymmetrical shape at
an opposite end of the body having a predetermined width for
resting an outer edge of a left hand on; and a grip portion
disposed between the barrel and the stop for a user to grasp with
both hands.
2. The bat of claim 1, further comprising a trajectory indicator
carved flat on a predetermined upper front surface of the barrel
for visually indicating a trajectory of the bat during different
stages of a swing.
3. The bat of claim 1, wherein the stop includes: a left-hand edge
rest formed on an upper portion thereof for resting an edge of a
left hand thereon; a left-hand palm rest formed on a left portion
of the stop for resting an outer edge of a left palm in an upwardly
diagonal direction thereagainst; and a left-hand finger rest formed
from a lower portion to a right side of the stop for resting an
lateral edge of a left hand little finger horizontally
therealong.
4. The bat of claim 1, wherein the stop includes: a left-hand palm
rest formed on a left portion of the stop for resting an outer edge
of a left palm in an upwardly diagonal direction thereagainst; and
a left-hand finger rest formed from a lower portion to a right side
of the stop for resting an outer lateral edge of a left hand little
finger horizontally therealong.
5. The bat of claim 1, wherein the grip portion has a smaller
diameter than the stop, the diameter gradually decreasing from a
base of the grip portion and increasing again as the grip portion
connects to the barrel.
6. The bat of claim 1 or 5, further comprising: a left-hand grip
line carved flat on a cylindrical surface of the grip portion and
in a direction parallel to a longitudinal direction of the bat, the
left-hand grip line beginning at a frontal central portion of a
juncture of the stop and the grip portion, wherein the left-hand
grip portion gradually spirals to a right when progressing towards
the barrel, maintaining flatness and a parallel disposition to the
longitudinal direction of the bat; a right-hand grip edge formed a
slight distance above an upper end of the left-hand grip line and
carved flat for guiding a right-hand grip and positioning a
proximal phalanx of a right hand index finger thereabove; and a
right-hand thumb positioner formed at a left upper area of the grip
portion directly across from the right-hand grip edge with respect
to a central upper line on the grip portion running in the
longitudinal direction of the bat.
Description
TECHNICAL FIELD
[0001] The present invention relates to a bat for practicing a
centrifugal golf swing, and more particularly, to a centrifugal
golf swing practice bat that helps acquire an understanding of the
proper grasping of a grip and tempers an ideal grasping power of
the grip for a swing as well as an understanding of a complete
trajectory of an ideal swing, in order to acquire a swing
comparable to a professional's.
BACKGROUND ART
[0002] Having recently grown popular among many people, golf is a
sport that provides a unique enjoyment and exercise benefits, and
involves striking a stationary ball with a driver, iron, putter, or
other club towards a hole cup that is a certain distance away.
[0003] In order to enjoy golf and elevate the level of one's game,
it is necessary to have a proper grip that forms the basis for an
accurate swing and to learn to use one's entire body and acquire a
sense of balance for an adequately powerful and centrifugal stroke.
To accomplish this, one must read theory and instruction manuals,
and invest countless hours of practice. This applies to beginners
as well as those of an intermediate level who wish to maintain a
learned golfing stance and stroke or improve thereupon.
[0004] A golf grip consists of joining the left and right hands
together to overlap, interlock, form a baseball grip, etc.,
depending on the preference of a player. An ideal swing involves
both hands moving as one, with a precise grip and grip pressure
unwavering throughout the swing, and transferring the force from a
pivotal movement of a body to a fast, swinging motion of a club
head. When a user does not grip a club properly, it detracts from
the golfer's concentration during a swing, and leads the golfer to
try to execute the swing with the hands and arms. This is a problem
common among amateurs, which often remains uncorrected during a
lifetime. A golfer should, in reality, not even think about the
grip during a swing. Points that require concentration are pivoting
the torso quickly and executing a balanced stroke. The shoulders
and arms should not be stiff, rotation of the torso should be
smooth and supple, and the hands at the ends of the arms should
function as firm anchors to secure the club during the swing. A
point to note here is that concentration should not dwell on the
grip, which is only possible with a complete understanding of the
function of each gripping portion of the hands.
[0005] A golf swing consists of a back swing, a transition, a
downswing, a follow-through, and a finish. The swing is an action
that involves an integrated and dynamic rotation of the lower and
upper torsos from a balanced stance, so that an axis at the center
of the torso can be perceived, the axis being the centripetal locus
of the torso. When a swing is executed with the centripetal locus
in mind, the trajectory of the club head at the tip of the swing
path moves in a circular arc with an even trajectory, and thereby
forms an ideal swing.
[0006] In order for the body to grow accustomed to this type of
swing or for a beginner to improve to an intermediate level,
devices for practicing gripping and swinging are used. Professional
golfers regard practice devices as indispensable tools for
fostering muscle memory and muscular development.
[0007] Conventional gripping practice devices include devices for
guiding proper hand placement only, or in some cases, devices that
foster completely improper hand placement while claiming to be
practice devices for learning a proper grip. These devices, which
focus on only an outwardly proper placement of the hands or a grip
feel, fail to consider the most intricate and difficult aspect of
attaining a proper grip, which is that without an understanding of
the function of each gripping part of the hands, the learning of a
proper grip can be adversely affected. Similarly, conventional grip
practice devices lead to a vague sense of hand positioning that
inhibits the understanding of the function of each gripping part of
the hands.
[0008] Along with the importance of understanding the function of
each gripping part of the hands, the most important aspect of a
good grip is that gripping pressure of the two hands should remain
adequate and unchanging throughout a swing. Conventional grip
practice devices do not foster learning of an adequate and
unchanging gripping pressure by two hands throughout a swing.
Therefore, many golfers need a practice device for mastering a grip
with an unwavering gripping force. Such a device has actually been
proposed, but the results have been unsatisfactory. One such device
in question uses a sensor on the grip to emit a sonic alert if the
grip pressure should change during a swing. However, this device
only outlines the outer form of the grip, and fails to provide an
understanding of each grasping portion and the relationship between
the torso and the arms during a swing, and can therefore be
discounted as a valid practice device for improving a swing.
[0009] Other conventional practice devices that are weighted focus
on muscular development for power or practicing a specific swing
trajectory. However, such devices require a firmer gripping force,
and condition a user to exert varying gripping force during a
swing, leading to swing execution that relies heavily on the hands
and arms so that a centrifugal swing is eluded. This is like
torching a house to catch a bedbug.
[0010] Also, conventional swing practice devices do not easily
allow the checking of a swing trajectory during the stages of the
swing, thereby leading to constant doubt regarding the swing plane.
Even if there are devices for changing one's swing trajectory,
these are reliant upon practice using partial strokes, versus
normal full-speed swings, so that when a real swing is executed, it
seldom resembles the practiced strokes. In addition, many amateurs
fail to realize that a faulty back swing leads to many other
problems.
[0011] Finally, conventional swing practice devices lack an
accompanying manual that is detailed, so that the effects of use
are unclear. Specifically, because most practice devices lack user
manuals, there is little feedback pertaining to the method of use
initially envisioned by the developer and the results of that use.
Such devices are therefore explored by a handful of users and
abandoned before they can become widespread. The latter is a very
important point because golf practice devices should always come
with a manual explaining its use, the theoretical results that can
be derived from using the device, and a detailed explanation. Many
users have ignored this necessity for a long time. A manual should
be based on sound golf theory, which directly relates to the
applicability and value of the enclosed practice device.
DISCLOSURE
Technical Problem
[0012] An object of the present invention is to provide a practice
bat for a golf swing that allows a user to practice a secure
gripping position that aids in understanding the function of each
gripping portion with respect to a two-handed swing.
[0013] Another object of the present invention is to provide a
practice bat for a golf swing that familiarizes a user with the
skill of grasping a grip with both hands using an adequate and
unchanging force.
[0014] A further object of the present invention is to provide a
practice bat for a golf swing that allows a user to check the
trajectory of a swing in stages thereof.
[0015] A still further object of the present invention is to
provide a practice bat for a golf swing that allows a user to
understand a method of utilizing a centripetal locus of the body to
grow naturally accustomed to a powerful, centrifugal swing using
the locus as a rotational pivot.
Technical Solution
[0016] In order to achieve the objects of the present invention, a
centrifugal golf swing practice bat for practicing a golf grip and
a swing position includes: a barrel on one end of a stick-shaped
body of a predetermined length, the barrel having a trajectory
indicator and an equal diameter from the end down and narrowing in
diameter toward a base thereof, a stop of an asymmetrical shape at
an opposite end of the body having a predetermined width for
resting an outer edge of a left hand on, and a grip portion
disposed between the barrel and the stop for a user to grasp with
both hands.
Advantageous Effects
[0017] The above-mentioned bat for practicing a golf grip and a
swinging position includes a barrel, a stop, and a grip portion.
The barrel is a predetermined length and is disposed on one end of
a stick-shaped body, and has a trajectory indicator and an equal
diameter from the end down and narrows in diameter toward its base.
The stop, with an asymmetrical shape at an opposite end of the
body, has a predetermined width to rest an outer edge of a left
hand on. The grip portion is disposed between the barrel and the
stop for a user to grasp with both hands. The golf bat of the
present invention allows a user to visually check swing trajectory
during the stages of a swing using the trajectory indicator to
acquire an ideal swing trajectory. In a two-handed swing, the bat
allows a user to understand the function of each part of the
grasping hands by providing a secure gripping position that lets
the user maintain an adequate and unwavering grip strength. A
centripetal locus of the body can thus be perceived, so that a
powerful, centrifugal swing can be naturally acquired to produce a
better golf game.
DESCRIPTION OF DRAWINGS
[0018] FIG. 1 is a perspective view of a practice bat of the
present invention;
[0019] FIG. 2 is a plan view of a practice bat of the present
invention;
[0020] FIG. 3 is detailed perspective view of the grip portion of a
practice bat of the present invention;
[0021] FIG. 4 is a plan view of the grip portion of a practice bat
of the present invention while the bat is being used;
[0022] FIG. 5 is a plan view of a practice bat according to another
embodiment of the present invention;
[0023] FIG. 6 is a plan view of a practice bat according to yet
another embodiment of the present invention;
[0024] FIG. 7 is a perspective view of a practice bat according to
a further embodiment of the present invention;
[0025] FIG. 8 is a detailed plan view of a grip portion of a bat
according to an embodiment of the present invention, illustrating a
method of gripping the practice bat; and
[0026] FIG. 9 is a perspective view illustrating a method of using
a practice bat according to an embodiment of the present
invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0027] Hereinafter, preferred embodiments of the present invention
will be described in detail with reference to accompanying
drawings.
[0028] FIG. 1 is a perspective view of a practice bat of the
present invention. FIG. 2 is a plan view of a practice bat of the
present invention. FIG. 3 is detailed perspective view of the grip
portion of a practice bat of the present invention. FIG. 4 is a
plan view of the grip portion of a practice bat of the present
invention while the bat is being used. FIG. 5 is a plan view of a
practice bat according to another embodiment of the present
invention. FIG. 6 is a plan view of a practice bat according to yet
another embodiment of the present invention, where the trajectory
indicator and the overall length of the bat is enlarged; and FIG. 7
is a perspective view of a practice bat according to a further
embodiment of the present invention, where the structure of the
stop and the grip portion has been altered.
[0029] As shown in FIGS. 1 and 2, a practice bat for a golf swing
according to the present invention includes: a body (a) with a
barrel 10 forming one end thereof, an asymmetrical and circular
stop 20 formed at the opposite end of the body (a), and a grip
portion 30 formed between the barrel 10 and the stop 20.
[0030] The barrel 10 has a larger diameter than the grip portion 30
or the stop 20, the diameter being uniform until it gradually
tapers and narrows toward its bottom. A trajectory indicator 11 is
formed on a surface of the barrel 10. The trajectory indicator 11,
as with the carved surface forming the left-hand gripping edge 31
beginning at the juncture of the stop 20 and the grip portion 30,
is aligned at the dead center in the frontal portion of the bat
(A). A certain portion of the front of the barrel 10 is carved
flat, as shown in the diagrams, so that a swing trajectory can be
easily verified visually.
[0031] The stop 20 is formed juxtaposed to the grip portion 30, and
has a larger diameter than the grip portion 30 to protrude a
predetermined distance from the grip portion 30. The stop 20 is
divided into three main parts according to function. First, a
left-hand edge rest 21 for resting the edge of a left hand is
formed on the upper portion of the stop 20. Second, a left-hand
palm rest 22 is formed on the left of the stop 20 for guiding the
lower portion of a left palm to press against it in a diagonal
direction. Finally, a left hand finger rest 23 for parallelly
pressing against the edge of a left hand little finger completes
the formation of the stop 20. The stop 20 is thus formed by these
three elements from its lower top portion to its right side.
[0032] The grip portion 30 is formed between the barrel 10 and the
stop 20, and like a normal grip of a golf club, is straight. The
straight grip portion 30 has a smaller diameter than the stop 20,
which gradually narrows from the base to the top and widens again
when the grip portion 30 ends and meets the barrel.
[0033] The grip portion 30, as shown in FIG. 3, includes a
left-hand grip line 31 beginning at the front dead center of the
bat (A) at the juncture of the stop 20 and the grip portion 30 and
being carved flat into the arcuate surface of the grip portion 30,
the flat left-hand grip line 31 gradually twisting to the right as
it rises along the grip portion 30 towards the barrel 10. A
right-hand grip edge 32 is formed slightly above the upper end of
the left-hand grip line 31 (that is, if the left-hand grip line 31
were extended towards the barrel 10, the right-hand grip edge 32
would be along the extension) to be flat and run parallel to the
length of the bat (A). With respect to a central longitudinal line
of the grip portion 30, a right-hand thumb positioner 33 is formed
opposite to the right-hand grip edge 32, and at the upper left
portion of the grip.
[0034] Also, referring to FIG. 7, the structure of the stop 20 and
the grip portion 30 may be partially altered. Specifically, the
left-hand edge rest 21 is not formed on the stop 20, but is formed
as an extension of the grip portion 30. In this case, most of the
centrifugal force during a swing is concentrated on the left-hand
finger rest 23, so that the lack of a left-hand edge rest 21 does
not result in slippage of the hands or fingers.
[0035] As shown in the structure of the above practice bat for a
centrifugal golf swing that includes a barrel 10, stop 20, and grip
portion 30, the components can be formed in a single piece or can
be made capable of disassembly down to a barrel 10, stop 20, grip
portion 30, and further pieces. The structure can be made of wood
or composite material, and be metallic or non-metallic, etc.
[0036] The following explains how the above bat can be used for
practicing gripping and swinging a golf club.
[0037] First, the fleshy edge of the left hand is positioned over
the flat surface at the start of the left hand grip line 31 at the
juncture of the stop 20 and the grip portion 30, and the last three
fingers are wrapped around to grasp the grip portion 30, so that
the edge of the left hand rests against the left-hand edge rest 21
formed at the top of the stop 20. Simultaneously, the bottom
portion of the left palm is positioned to rest against the
left-hand palm rest 22, and the outer lateral edge of the left
hand's little finger is positioned to rest against the left-hand
finger rest 23 that spirals upward towards the right from the top
of the stop 20. When the left hand grasps the grip portion 30 as
described, the outer edge of the left hand fits over the stop 20
like a puzzle, to provide a secure grip.
[0038] Here, the left-hand edge rest 21, as described in the
embodiments of the present invention, is not a necessary structural
component, and can be optionally formed and on the bat. That is,
despite the fact that the left-hand edge rest 21 provides a natural
rest for the edge of the left hand when present, it is not
necessary because most of the centrifugal force during a swing is
imparted on the left-hand finger rest 23. A bat without a left-hand
edge rest 21 is shown in FIG. 7.
[0039] The line along the inside of the left palm extending from
the outer edge of the hand to the thumb is pressed along the
left-hand grip line 31. Next, the index and middle fingers of the
right hand wrap around the grip portion 30, and the base portion of
the right hand wraps around the left hand, so that the proximal
phalanx of the right index finger presses against the right-hand
grip edge 32. For proper hand positioning, the right side of the
right thumb should be positioned to rest over the right-hand thumb
positioner 33 located opposite to the right-hand grip edge 32.
[0040] When the bat (A) is gripped in this manner, with the outer
lateral edge of the left hand fitting like a puzzle over the stop
20, the grip of only the left hand over the grip portion 30 is
secure enough to prevent the bat (A) from coming loose during a
swing, so that the gripping of a club with unnecessary tenacity
(which is a bad habit of many golfers) can be corrected.
[0041] Moreover, by respectively positioning the left and right
hands on the left-hand grip line 31 and the right-hand grip edge 32
and the right-hand thumb positioner 33, not only are the two hands
overtly joined, but the inner portions of both hands used to form a
release line can be easily perceived. That is, the bat allows a
user to perceive the gripping functions of each hand, to facilitate
the completion of a proper grip.
[0042] Although the weight balance of the bat (A) barrel 10 feels
the same as a golf club, the actual weight of the bat (A) is
heavier than a golf club, to aid in muscular development. Despite
its heavier weight than a golf club, the stop 20 allows a user to
yield the bat (A) less forcefully. When a suitable gripping
pressure is combined with appropriate joining of the two hands,
then the grip is finally complete, and a proper setup for a stance
without stiffness in the arms and shoulders can be achieved. In
addition, a user can experience the proper rhythm and tempo for a
swing because (s)he does not have to grasp the bat tightly while
swinging. After this process is repeated, the user will be able to
concentrate on centering the body (maintaining a centripetal locus)
and transfer of body weight while executing a stroke. Specifically,
concentrating on grip execution diverts one's attention from
maintaining a centripetal locus to use as a rotational axis for a
centrifugal swing.
[0043] Bodily rotation around a centripetal locus or the
relationship between extending one's arms and rotating around the
centripetal locus can be better sensed, and the rotational force
inherent from that relationship transferred through two hands to
the bat (A) is centrifugal force. Accordingly, using the inventive
bat provides a scientific and systematic way of learning a
centrifugal golf swing that is taught in textbooks.
[0044] One of the most difficult skills for amateurs to acquire is
the transition from the top of the back swing. A quick method of
learning this skill is to understand the function of the two hands,
and transferring body weight and bodily rotation while maintaining
the same grip pressure through the transition. The practice bat for
a centrifugal swing of the present invention addresses this
problem.
[0045] The trajectory indicator 11 at the upper front portion of
the barrel 10 helps to provide an understanding the trajectory of a
back swing by stages and a proper top of a back swing, and creating
a top of a back swing using the release line formed by two hands
positioned in a proper grip. Similarly, the related top of the back
swing is called a slot position.
[0046] The practice bat for a centrifugal swing of the present
invention allows practicing the downswing using maximum power in
the swing at anytime, in any location, so that strength training
using a proper grip and stance set up with a balanced bodily
rotation can be achieved. The bat can thus be effectively utilized,
not only by amateurs, but also by professional golfers.
[0047] Referring to FIGS. 8 and 9, the practice bat for a golf
swing according to the present invention can be used for practicing
a swing using only the right hand. That is, when practicing with
only the right hand grasping the bat (as shown in FIG. 8), the
left-hand finger rest 23 acts as a rest for the fingers of the
right hand. Here, the outer edge of the right hand rests against
the flat top surface of the stop 20, so that the position of the
right hand is the same as when both hands grasp the bat.
[0048] The above practice bat for a centrifugal golf swing of the
present invention can be made in various sizes and weights. For
instance, a body (a) length of 76 cm with a total weight of 800 g
is suitable for an average adult male, a length of 68 cm with a
weight of 650 g is suitable for an average adult female, and a
length of 60 cm with a weight of 500 g is suitable for juniors.
Because it is important that the diameter of the grip portion 30
must match a user's finger length and palm size, the diameter
should correspond to those of actual golf clubs. This is important
for amateurs who may not know what size grip to use. If they
practice with a bat (A) using a grip size corresponding to actual
clubs, they will know what clubs will fit their hand sizes.
[0049] While the present invention has been described and
illustrated herein with reference to the preferred embodiments
thereof, it will be apparent to those skilled in the art that
various modifications and variations (including a variety of
different forms for the barrel 10, stop 20, and the grip portion
30) can be made therein without departing from the spirit and scope
of the invention. Thus, it is intended that the present invention
covers the modifications and variations of this invention that come
within the scope of the appended claims and their equivalents.
[0050] Also, although the above descriptions relating to the left
and right hands apply to right-handed users, the present invention
is not limited to such usage. For left-handed applications, the
descriptions may simply be switched.
* * * * *