U.S. patent application number 09/120273 was filed with the patent office on 2002-12-26 for ball bat.
Invention is credited to SNOW, MICHAEL L..
Application Number | 20020198071 09/120273 |
Document ID | / |
Family ID | 22389264 |
Filed Date | 2002-12-26 |
United States Patent
Application |
20020198071 |
Kind Code |
A1 |
SNOW, MICHAEL L. |
December 26, 2002 |
BALL BAT
Abstract
A ball bat having a body comprised of resin impregnated with
five carbon and glass fiber socks, the body having a barrel, a
taper portion and a handle portion, and a central cavity extending
the length of the body. Additionally, an aluminum sleeve is
press-fit along the inside of the barrel, and a flexible end cap is
mounted within the end of the barrel.
Inventors: |
SNOW, MICHAEL L.; (MENOMONEE
FALLS, WI) |
Correspondence
Address: |
SCHWEGMAN, LUNDBERG, WOESSNER & KLUTH, P.A.
P.O. BOX 2938
MINNEAPOLIS
MN
55402
US
|
Family ID: |
22389264 |
Appl. No.: |
09/120273 |
Filed: |
July 22, 1998 |
Current U.S.
Class: |
473/564 ;
473/567 |
Current CPC
Class: |
A63B 60/54 20151001;
A63B 60/16 20151001; A63B 60/50 20151001; A63B 2102/18 20151001;
A63B 2102/182 20151001; A63B 59/50 20151001; A63B 59/54 20151001;
A63B 2209/02 20130101; A63B 2225/01 20130101 |
Class at
Publication: |
473/564 ;
473/567 |
International
Class: |
A63B 059/06 |
Claims
I claim:
1. A ball bat comprising: a body comprising: a plurality of
circumferentially-extending fiber layers impregnated in a resin
matrix; a barrel having a proximal end and a distal end having an
opening adapted to receive an end cap, said barrel further having
an inner surface; a taper portion having a proximal end and a
distal end terminating in said proximal end of said barrel; and a
handle portion having a proximal end and a distal end terminating
in said proximal end of said taper portion, said proximal end
terminating in an integral knob end; and a central cavity extending
along the length of the body.
2. The ball bat according to claim 1 wherein said plurality of
fiber layers impregnated in a resin matrix comprise five fiber
layers, the layers comprising: two fiber outer layers extending
from said distal end of said barrel to said proximal end of said
handle portion; and three fiber inner layers extending from said
distal end of said barrel to said proximal end of said barrel.
3. The ball bat according to claim 1 wherein said resin matrix
comprises bisphenol a/epichlorohydrin-based epoxy resin.
4. The ball bat according to claim 1 further comprising a flexible
end cap fixedly housed within said open distal end of said
barrel.
5. The ball bat according to claim 4 wherein said end cap is
comprised of material selected from the group consisting of rubber
and plastic.
6. The ball bat according to claim 1 further comprising a metallic
sleeve having an inner surface and an outer surface, said outer
surface of said sleeve engaging said inner surface of said barrel,
said sleeve providing a medium for vibration absorption when said
barrel comes into contact with a projectile.
7. The ball bat according to claim 6 wherein said metallic sleeve
is made of material selected from the group consisting of steel,
titanium, iron and aluminum.
8. The ball bat according to claim 2 wherein each said fiber layer
is a cylindrical braid-woven sock.
9. The ball bat according to claim 2 wherein said fiber layers are
comprised of materials selected from the group consisting of carbon
and glass.
10. A ball bat comprising: a body comprising: a barrel having a
proximal end and a distal end having an opening adapted to receive
an end cap, said barrel further having an inner surface; a taper
portion having a proximal end and a distal end terminating in said
proximal end of said barrel; and a handle portion having a proximal
end and a distal end terminating in said proximal end of said taper
portion, said proximal end terminating in an integral knob end; a
layer of five circumferentially-extending fiber braid-woven socks
concentrically arranged and impregnated in a resin matrix, two of
said five fiber braid-woven socks extending from said distal end of
said barrel to said proximal end of said handle portion, three of
said five fiber braid woven-socks extending from said distal end of
said barrel to said proximal end of said barrel and concentrically
disposed within said two of said five fiber braid-woven socks. an
elongated central cavity extending the length of the body; a
flexible end cap fixedly housed within said open distal end of said
barrel; and a metallic sleeve having an inner surface and an outer
surface, said outer surface of said sleeve engaging said inner
surface of said barrel, said sleeve providing a medium for
vibration absorption when said barrel comes into contact with a
projectile.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to athletic bats, and more
specifically to a softball bat comprised of fiber-impregnated resin
for improved hitting distance and reduced vibration.
[0003] 2. Description of the Related Art
[0004] Traditional athletic bats are comprised of wood or metal,
which are expensive and consume valuable natural resources. A
disadvantage of wood bats is that they frequently break during use
and it is exceedingly difficult to design such bats for consistent
performance, given their natural material. Metal bats, while more
durable, have the tendency to transmit vibration down the shaft to
the hands of the user, making hitting a ball an unpleasant
experience.
[0005] Composite bats and related sporting goods are well known in
the related art. U.S. Pat. No. 4,546,976 which issued to T. N.
Jones on Oct. 15, 1985, discloses a reinforced plastic bat with a
separate handle section that is softer than the hitting section.
Similarly, U.S. Pat. No. 4,569,521 which issued to A. W. Mueller on
Feb. 11, 1986, discloses a composite bat having a tapered aluminum
spar encased in polyurethane foam in order to provide exceptional
stiffness while providing freedom from excessive vibrations.
[0006] Sports articles comprised of fiber-resin composites are also
well known in the related art. One such invention, disclosed in
U.S. Pat. No. 4,836,545, teaches a two-piece metallic and composite
golf shaft. This invention comprises a metallic tip that
telescopingly fits into an upper composite section comprised of
high-strength fibers such as carbon-graphite. The two pieces are
bonded together with high-strength epoxy adhesive.
[0007] U.S. Pat. No. 4,848,745 which issued to Bohannon et al. on
Jul. 18, 1989, discloses a fiber-reinforced article such as a
filament-wound bat or bowling pin formed from a thermoplastic
resin. The article comprises at least three layers of fiber
reinforcement sheets, the fibers comprised of material such as
glass or carbon fiber. Each layer comprises fibers that either:
circumferentially, longitudinally or helically extend in relation
to the article.
[0008] U.S. Pat. No. 4,931,247 which issued to C. Yeh on Jun. 5,
1990, discloses a fabrication method of a hollow racket made of
carbon fiber. During this process, a hollow bat is made by coupling
the mounting of a fiber sleeve tube with the cutting of fiber-woven
board. Additionally, adhesive agents are filled into the bat body
and the segments of an air-blowing tube are adhered to the interior
wall of the bat body, where the air is expelled during heating,
thereby preventing cracking of the bat.
[0009] U.S. Pat. No., 5,409,214 which issued to D. C. Cook on Apr.
235, 1995, discloses a baseball bat having a handle and a hitting
portion comprised of wood. The handle may be made of either metal
or fibrous composites. Additionally, U.S. Pat. No. 5,496,027 which
issued to Christian et al. on Mar. 5, 1996, discloses a reinforced
hockey stick blade and method of making same. The blade is
constructed of resin impregnated with a plurality of reinforcement
fibers, and may be placed onto the shaft of a hockey stick.
[0010] U.S. Pat. No. 5,593,158 which issued to Filice et al. on
Jan. 14, 1997, discloses a shock-attenuating ball bat having a
handle that extends into a taper portion and is nested within the
barrel, the handle and the barrel separated by an elastomeric
isolation union, thereby reducing shock transmitted from the barrel
when a batter strikes a ball. The handle and/or the barrel may be
comprised of fiber-impregnated resin.
[0011] Additionally, U.S. Pat. No. 5,624,115 which issued to C. S.
Baum on Apr. 29, 1997 discloses a composite bat with a cavitated
core. The bat has a cellulose outer layer covering a layer of
fiber-reinforced resin, which in turn surrounds a cavitated core
that may also contain foam.
[0012] U.S. Pat. No. 5,722,908 which issued to Feeney et al. on
Mar. 3, 1998, discloses a composite bat with a metal barrel, and a
method of fabricating same. The bat has a frame having a recess and
fabricated of a composite material of fibers in a matrix binder. A
metal sleeve is inserted over the recess of the frame, which forms
a hitting surface.
[0013] U.S. Pat. No. 5,743,811 which issued to G. M. Bird on Apr.
28, 1998, discloses a lightweight golf shaft having an inner and
outer layer, each composed of graphite fiber and cured epoxy resin.
A middle layer is composed of two foam half-forms or a single foam
full form, thereby making the shaft lighter than conventional
shafts. A method for making this shaft is also disclosed.
[0014] French Patent No. 2,462,266 which issued to Technique du
Verre Tisse and was published on Feb. 13, 1981, discloses a
laminated racquet shaft reinforced with parallel and crossed
filaments lain up in separate layers to maintain alignment of the
shaft. These filaments may be constructed of glass, boron, carbon,
silica or aromatic polyamide. Additionally, French Patent No.
2,560,551 which issued to M. Verna and was published on Sep. 6,
1985 discloses a method of making reinforced plastic hollow
articles by wrapping plain or resin-impregnated fibers about a
multi-piece mandrel and modifying the resultant form by means of a
press to obtain a taut profile with tight radial packing of the
layers of fibers.
[0015] Japanese Patent No. 3,247,365 which issued to Mistubishi
Rayon K. K. and was published on Nov. 5, 1991, discloses a
composite bat comprising a foam core material covered by a back up
pipe which is in turn covered by fiber-reinforced plastic. Finally,
Japanese Patent No. 564,671 which issued to Mizuno Corp. and was
published on Mar. 19, 1993, discloses a fiber-reinforced plastic
bat and method of making same. An outer shell member is formed on a
core which is given the shape of a bat when reinforced fiber and
thermoplastic resin fiber is wound about the shaft. The
thermoplastic resin fiber is melted by heat and forms a matrix,
thereby impregnating the reinforced fiber therein.
[0016] None of the above inventions and patents, taken either
singularly or in combination, is seen to describe the instant
invention as claimed. Thus, a ball bat solving the aforementioned
problems is desired.
SUMMARY OF THE INVENTION
[0017] The present invention provides a bat having a body with a
hollow central cavity and having a barrel, a taper portion and a
handle. The body is comprised of resin impregnated with multiple
(e.g., five) braid-woven socks, the socks being constructed of
carbon fiber and glass fiber, some of the socks extending the
length of the body, while others of the socks extend the length of
the barrel. This particular composition allows a slight deformation
of the body, thereby creating a trampoline or springboard effect,
adding to the velocity of a hit ball.
[0018] Additionally, an aluminum sleeve is press-fit inside the
barrel in order to dissipate the kinetic energy when the ball
impacts the bat, energy which would otherwise be transmitted down
the shaft to sting the batter's hands. Additionally, a flexible end
cap is present on the end of the barrel to properly weight the bat,
and to further aid in the deformation of the body, thereby
increasing the trampoline effect of the bat.
[0019] Accordingly, it is a principal object of the invention to
provide a fiber-impregnated resin ball bat having the necessary
strength to withstand the impact forces of a projectile, while
providing a trampoline or springboard effect to for added velocity
of the projectile.
[0020] It is another object of the invention to provide a ball bat
that effectively dissipates the kinetic energy generated by a
collision with a ball, without reducing the effectiveness of the
bat.
[0021] It is a further object of the invention to provide a resin
impregnated bat that may be easily manufactured and marketed.
[0022] It is an object of the invention to provide improved
elements and arrangements thereof for the purposes described which
is inexpensive, dependable and fully effective in accomplishing its
intended purposes.
[0023] These and other objects of the present invention will become
readily apparent upon further review of the following specification
and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 is a perspective view of a ball bat according to the
present invention.
[0025] FIG. 2 is a longitudinal sectional view of the present
invention, with a portion of the aluminum sleeve broken away and
the end cap exploded away.
[0026] FIG. 3 is an enlarged scale section view of the present
invention drawn along lines 3-3 of FIG. 1.
[0027] FIG. 4 is a plan view of the fiber socks of the present
invention.
[0028] Similar reference characters denote corresponding features
consistently throughout the attached drawings.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0029] Referring now to the drawings wherein like numerals
represent like elements, FIGS. 1 and 2 show a bat 10 according to
the preferred embodiment of the present invention. While a softball
bat 10 is shown as the preferred embodiment, the present invention
is not limited to softball bats and extends to similar articles
such as baseball bats, drum sticks, billy clubs, walking sticks,
cricket bats, field hockey sticks, furniture legs and the like.
[0030] The bat 10 consists of a body 12 having a hollow inner
cavity 13, and is radially symmetrical about a center axis, the
body further having a barrel 14, a taper portion 16, and a handle
portion 18. The barrel is configured to receive an end cap 19 and
becomes progressively narrower from the taper portion 16 through
the handle portion 18, which terminates in a knob end 20 integral
to the handle portion. The knob end 20 functions to ensure that the
batter's hands stay on the bat 10 during a swing.
[0031] While many prior art bats have knob ends that are either
screwed on or welded on, the present invention has an integral knob
end 20, greatly reducing the possibility of the knob falling off
the handle portion 18, which would otherwise render the bat 10
unusable under the "Official Rules of Softball." The handle;
portion 18 may be wrapped with grip material 22, commonly found in
aluminum bats, to prevent hand slippage when swinging the bat 10.
The grip material 22 may be formed of rubber, synthetic rubber,
foam, tape or other suitable material.
[0032] The body 12 is comprised of a continuous resin matrix
reinforced with a plurality of circumferentially-extending fiber
socks 24, 26, shown in FIGS. 3 and 4. In the preferred embodiment,
the resin components consist of Shell EPON.RTM. 826 epoxy resin,
DuPont.RTM. DCH-99 hardener, and DuPont DYTEK.RTM.-A flexiblizer,
although other resin components may be used in alternative
embodiments. Also, in the preferred embodiment the fiber socks 24,
26 are cross woven and are comprised of 60% glass fiber and 40%
carbon fiber, although other types of weaves and other fibers may
be used in alternative embodiments.
[0033] This particular combination of resin components and fiber
socks 24, 26 results in a high-strength yet flexible body 12. When
a ball impacts the bat 10 during the batter's swing, the bat
undergoes a localized deformation conforming to the contact area of
the ball, as well as radial or hoop deformation (i.e., the
cylindrical bat temporarily deforms into an ovoid when viewed in
cross section). This deformation provides a springboard or
trampoline effect which further enhances the hitting zone of the
bat 10 and provides maximum velocity to the ball when hit by the
bat.
[0034] In the preferred embodiment, five fiber socks 24, 26 are
used in the body 12 of the bat 10 and are concentrically arranged
within the resin matrix of the body. The five fiber socks 24, 26
comprise two outer socks 24 and three inner socks 26. The two outer
socks 24 substantially extend the entire length of the body 12,
while the three inner socks 26 substantially extend the length of
the barrel 14, as shown in FIG. 4. This configuration provides the
bat 10 with ideal reinforcement properties while at the same time
saving weight.
[0035] Additionally, the preferred embodiment of the bat 10 has a
cylindrical metal sleeve 28 that is press-fit to the inner surface
of the barrel 14. The sleeve 28 functions to dissipate vibration
when the ball is hit, thereby converting kinetic energy that would
otherwise be transferred to the batter's hands in the form of
"stinging", into heat subsequently lost to the environment. In
reducing shock, the sleeve does not reduce the effectiveness of the
bat 10 when the bat imparts an impulse on a ball, as elastomeric
materials often do. The result is that the "sting" felt by the
batter is reduced without adversely affecting the batter's
game.
[0036] In the preferred embodiment, the sleeve 28 is comprised of
aluminum, as this particular metal has ideal vibration-absorbing
properties, but alternative embodiments may utilize sleeves of
other types of metals such as titanium and steel. Having a metal
sleeve 28 on the inside of the barrel 14 is more beneficial than
having a metal sleeve on the outside of the barrel, as the modulus
of elasticity of metal is greater than that of a resin matrix.
Therefore when a ball is hit by a bat having a metal sleeve on the
outside of the barrel, the ball, rather than the bat, deforms,
thereby increasing the aerodynamic drag on the ball and resulting
in reduced velocity of the ball. It is therefore more desirable to
have a barrel having an outer surface of resin matrix, which
contributes to the aforementioned springboard or trampoline effect
of the bat 10.
[0037] The end cap 19 is comprised of urethane in the preferred
embodiment, although end caps constructed of other flexible
materials may be used in alternative embodiments. A urethane end
cap 19, however, maximizes the above-described trampoline effect of
the bat 10, allowing further deformation of the bat upon contact
with a ball. The end cap additionally functions to provide the bat
with the appropriate weight.
[0038] The method of forming the bat 10 will now be described. The
preferred method of forming the bat is described in my copending
U.S. patent application Ser. No. 08/910,100, filed Aug. 13, 1997,
incorporated herein by reference. This method comprises the steps
of concentrically placing the plurality of fiber socks 24, 26 on a
removable mandrel. The mandrel is then placed into a press having
an outer mold having an internal configuration corresponding to the
external configuration of the body 12, whereupon void-free uncured
resin is injected into the mold. The resin is then cured where it
takes the form of the body 12, which is then removed from the mold.
Thereafter, the cylindrical sleeve 28 is press-fit into inside
surface of the barrel. The end cap 19 is then molded in place in
the end of the barrel 14, and a high-gloss epoxy coating is given
to the outside of the body 12. Grip material 22 is then added to
the handle portion 18.
[0039] It is to be understood that the present invention is not
limited to the embodiments described above, but encompasses any and
all embodiments within the scope of the following claims.
* * * * *