WO2003018143A1 - Racket being improved elastic and repellent force - Google Patents

Racket being improved elastic and repellent force Download PDF

Info

Publication number
WO2003018143A1
WO2003018143A1 PCT/KR2002/001626 KR0201626W WO03018143A1 WO 2003018143 A1 WO2003018143 A1 WO 2003018143A1 KR 0201626 W KR0201626 W KR 0201626W WO 03018143 A1 WO03018143 A1 WO 03018143A1
Authority
WO
WIPO (PCT)
Prior art keywords
racket
unit
head frame
strings
oblique grooves
Prior art date
Application number
PCT/KR2002/001626
Other languages
French (fr)
Inventor
Sun-Kyum Kim
Original Assignee
Sun-Kyum Kim
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR2020010026450U external-priority patent/KR200256969Y1/en
Priority claimed from KR2020010026449U external-priority patent/KR200256968Y1/en
Application filed by Sun-Kyum Kim filed Critical Sun-Kyum Kim
Priority to US10/487,930 priority Critical patent/US20040209715A1/en
Publication of WO2003018143A1 publication Critical patent/WO2003018143A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00Stringed rackets, e.g. for tennis
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00Stringed rackets, e.g. for tennis
    • A63B49/02Frames
    • A63B49/022String guides on frames, e.g. grommets
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00Stringed rackets, e.g. for tennis
    • A63B49/02Frames
    • A63B49/08Frames with special construction of the handle
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00Stringed rackets, e.g. for tennis
    • A63B49/02Frames
    • A63B49/10Frames made of non-metallic materials, other than wood
    • A63B49/11Frames made of non-metallic materials, other than wood with inflatable tubes, e.g. inflatable during fabrication
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/10Reinforcements for stringing
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06Handles
    • A63B60/16Caps; Ferrules
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/52Details or accessories of golf clubs, bats, rackets or the like with slits

Definitions

  • the present invention relates to a racket being improved elastic and
  • a racket 100 includes an elliptical
  • Rackets are manufactured in a suitable thickness and size for ball games such as tennis, badminton and squash tennis. Especially, researches
  • thrust device which can move in the up/down direction on the racket to
  • this invention fails to provide the racket having high industrial
  • the head frame 124 is weakened.
  • fins 116 are protruded from the support member 114 to
  • a size of the head frame 124 is
  • the strings 132 are inserted into string holes 134, the strings 132 are
  • An object of the present invention is to provide a racket being
  • the head frame a handle unit extended from the neck unit, and oblique
  • the oblique grooves can be consecutively formed
  • Gas is filled in a space unit formed by the head frame, the neck unit
  • the oblique grooves are rounded in the width direction of
  • the racket collides with the ground in tennis and badminton.
  • racket can be maintained 240g, which is smaller than the general racket
  • the racket of the invention does not need the support
  • the racket can be obtained with a small amount of material, to reduce the
  • the high performance racket can be
  • Fig. 1 is a perspective view illustrating one example of a
  • Fig. 2 is a plan view illustrating another example of the conventional
  • Fig. 3 is a partial perspective view illustrating the tennis racket of
  • Fig. 4 is a perspective view illustrating a racket in accordance with a
  • Fig. 5 is an enlarged view illustrating part A of Fig. 4;
  • Fig. 6 is a perspective view illustrating a racket in accordance with a
  • Fig. 7 is an enlarged view illustrating part B of Fig. 6;
  • Fig. 8 is an enlarged view illustrating major parts of a racket in
  • Fig. 9 is a perspective view illustrating a racket in accordance with a
  • Fig. 10 is a cross-sectional view illustrating the racket of Fig. 9.
  • a racket being improved elastic and repellent force in accordance with
  • Figs. 4 and 5 respectively illustrate a racket in accordance with a
  • first embodiment of the present invention including an elliptical head frame, a net unit installed along the inner surface of the head frame, a neck
  • oblique grooves 13 are consecutively
  • the net unit 5 are coated by high elastic tubes 19 in the oblique grooves 13.
  • the present invention provides the racket having the excellent
  • Figs. 6 and 7 respectively illustrate a racket in accordance with a
  • oblique grooves 13 are consecutively
  • the present invention increases the tension in string by
  • gas 18 is filled in a space unit formed by
  • a head frame 3 a neck unit 7 and a handle unit 9, and a lower end unit 11
  • the gas injection unit 16 is formed at the end of the handle unit 9.
  • the gas injection unit 16 is formed at the end of the handle unit 9.
  • elastic tube 23 is adhered to the whole inner surface of the incorporated structure of a head frame 3, a neck unit 7 and a handle unit 9, to increase

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention relates to a racket being improved elastic and repellent force including an elliptical head frame, a net unit installed along the inner surface of the head frame, a neck unit formed in the long axis direction of the head frame, a handle unit extended from the neck unit, and oblique grooves being consecutively formed along the \outer circumference of the head frame so that strings extended from the net unit can be wound on the head frame. Because the tension is improved in string, the strings crossing each other in the net unit can maintain a predetermined interval to improve the elastic and repellent force, and users can enjoy ball games without correcting the strings. Moreover, the present invention provides the racket having the excellent elastic and repellent force and impact absorption force without considering a material of the racket or strings or using a special device, and thus provides the simple and excellent racket which can be applied to various ball games with a low price.

Description

RACKET BEING IMPROVED ELASTIC AND REPELLENT FORCE
TECHNICAL FIELD
The present invention relates to a racket being improved elastic and
repellent force, and more particularly to, a racket being improved elastic
and repellent force which includes an elliptical head frame, a net unit
installed along the inner surface of the head frame, a neck unit formed in
the long axis direction of the head frame, and a handle unit extended from
the neck unit, oblique grooves being consecutively formed along the outer
circumference of the head frame so that strings extended from the net unit
can be wound on the head frame.
BACKGROUND ART
In general, as shown in Fig. 1, a racket 100 includes an elliptical
head frame 200, a net unit 300 installed along the inner surface of the head
frame 200 to pass through the head frame 200, a neck unit 400 formed in
the long axis direction of the head frame 200, a handle unit 500 extended
from the neck unit 400, and a lower end unit 600 formed at the end of the
handle unit 500.
Rackets are manufactured in a suitable thickness and size for ball games such as tennis, badminton and squash tennis. Especially, researches
have been made to improve a strength, an elastic and repellent force and
an impact adsorption force of the racket. There have been a lot of attempts
to improve the strength, elastic and repellent force and impact adsorption
force of the racket by improving a material thereof, which fails to suggest
the most suitable material for the racket.
In addition, the racket price is considerably changed according to
the material. Therefore, to provide the optimal racket by improving the
material results in the high price of the racket. Even if the racket is made of
a high quality material, it cannot completely solve the foregoing problems.
Accordingly, researches have recently been made to improve the property
of the racket by using a special component, less concentrated on the
improvement of the high-priced material.
For example, there has been suggested an invention which intends
to improve an impact adsorption force and an elastic and repellent force of
a racket by inserting a high elastic sponge piece into a net unit. However,
this invention fails to achieve the aforementioned objects because the
sponge piece is easily separated from the net unit due to an impact by a ball
in a tennis game.
As disclosed in the Korea Patent Official Gazette 2000-36629, there has been taught an invention which intends to improve an elastic and
repellent force and an impact adsorption force of a racket by mounting a
thrust device which can move in the up/down direction on the racket to
increase power of the racket.
However, the aforementioned invention using the thrust device
which can move in the up/down direction can only be applied to the tennis
racket due to structural problems. Moreover, the thrust device complicates
the structure of the racket, increases the production price of the racket,
and incurs the maintenance and repair expenses due to its partial damage.
Thus, this invention fails to provide the racket having high industrial
applicability.
The US Patent 6,062,994 as shown in Figs. 2 and 3 mounts a support
member 114 on the outer circumference of a head frame 124 to improve a
strength and an elastic and repellent force of the head frame 124.
However, the support member 114 for reinforcement increases a
weight of a racket 110. Therefore, when the racket 110 maintains a
constant weight, the head frame 124 is weakened.
In addition, fins 116 are protruded from the support member 114 to
the frame 124 to fix strings 123, to relatively increase air resistance. It
reduces racket performance compared with weight. Furthermore, a hitting surface is reduced as large as the protrusion width of the fins 116. In order
to obtain the sufficient hitting surface, a size of the head frame 124 is
increased, to increase the unit cost and weight of the racket 110. Because
the strings 132 are inserted into string holes 134, the strings 132 are
seriously bent in front of and behind the string holes 134 to reduce the
elastic and repellent force, and easily cut to reduce the life span. It is also
difficult to align the strings 132 in the up/down direction.
The formation process of the support member 114 including the fins
116 is complicated, and an additional process for punching the string holes
134 is necessary, to reduce productivity and increase defects. It results in
great production cost.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a racket being
improved elastic and repellent force which shows the same performance in
a variety of ball games including tennis without considering a property of a
material and installing a special device.
In order to achieve the above-described object of the invention,
there is provided a racket being improved elastic and repellent force
comprising an elliptical head frame, a net unit installed along the inner surface of the head frame, a neck unit formed in the long axis direction of
the head frame, a handle unit extended from the neck unit, and oblique
grooves being consecutively formed along the outer circumference of the
head frame so that strings extended from the net unit can be wound on the
head frame. In addition, the oblique grooves can be consecutively formed
in a part of the head frame.
Gas is filled in a space unit formed by the head frame, the neck unit
and the handle unit.
Preferably, the oblique grooves are rounded in the width direction of
the head frame. Differently from the general racket structure which cannot
easily control tension in string because the strings extended from the net
unit are passed through the insertion holes of the head frame and wound in
a "τ= " shape, the strings extended from the net unit are easily strung by
the rounded surface of the oblique grooves of the head frame.
In addition, high elastic tapes are adhered to the outer surfaces of
the oblique grooves, to improve tension in string.
On the other hand, the above-described object of the invention can
be achieved by forming the grooves on the outer circumference of the head
frame in the longitudinal direction, and adhering the high elastic tapes to
the outer circumference of the grooves. According to another aspect of the invention, the strings extended
from the net unit are coated by high elastic tubes in the oblique grooves,
thereby preventing the strings of the head frame from being abraded when
the racket collides with the ground in tennis and badminton.
In accordance with the present invention, the tension of the tennis
strings is improved without using a special component such as a general
support member. Therefore, the strings crossing each other in the net unit
can maintain a predetermined interval to improve the elastic and repellent
force, and users can enjoy ball games without correcting the strings.
Because the excellent elastic and repellent force and impact absorption
force are obtained without using a special device, the weight or size of the
racket or resistance is not increased. As a result, the whole weight of the
racket can be maintained 240g, which is smaller than the general racket
(270g) by 12% and the racket of Fig. 2 (300g) by 25%.
Especially, the racket of the invention does not need the support
member having the string holes, and thus prevents the elastic and repellent
force and the life span from being reduced because the tennis strings are
seriously bent in front of and behind the string holes. Moreover, it is not
necessary to consider which material is suitable for the racket or strings. A
defect rate and a number of processes are decreased by omitting a complicated formation process of the support member, which results in
improved productivity of the racket.
In addition, the elastic and repellent force, impact absorption force
and strength of the racket can be improved by incorporating the frame, the
neck unit and the handle unit, and filling various gases such as helium gas
and compression air in the space unit thereof, without considering the
material of the racket or strings and using a special device. In the case that
the entire elasticity of the racket is remarkably varied according to the
elastic and repellent force of the shaft itself, such as the badminton racket
or squash tennis racket, performance of the racket is sufficiently improved
to increase the entire strength of the racket. That is, the same strength of
the racket can be obtained with a small amount of material, to reduce the
weight of the racket. As a result, the high performance racket can be
manufactured easily with a low price.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view illustrating one example of a
conventional tennis racket;
Fig. 2 is a plan view illustrating another example of the conventional
tennis racket; Fig. 3 is a partial perspective view illustrating the tennis racket of
Fig. 2;
Fig. 4 is a perspective view illustrating a racket in accordance with a
first embodiment of the present invention;
Fig. 5 is an enlarged view illustrating part A of Fig. 4;
Fig. 6 is a perspective view illustrating a racket in accordance with a
second embodiment of the present invention;
Fig. 7 is an enlarged view illustrating part B of Fig. 6;
Fig. 8 is an enlarged view illustrating major parts of a racket in
accordance with a third embodiment of the present invention;
Fig. 9 is a perspective view illustrating a racket in accordance with a
fourth embodiment of the present invention; and
Fig. 10 is a cross-sectional view illustrating the racket of Fig. 9.
BEST MODE FOR CARRYING OUT THE INVENTION
A racket being improved elastic and repellent force in accordance
with the present invention will now be described in detail with reference to
the accompanying drawings.
Figs. 4 and 5 respectively illustrate a racket in accordance with a
first embodiment of the present invention, including an elliptical head frame, a net unit installed along the inner surface of the head frame, a neck
unit formed in the long axis direction of the head frame, and a handle unit
extended from the neck unit. Here, oblique grooves 13 are consecutively
rounded in the width direction of the head frame 3 along the outer
circumference of the head frame 3 so that strings 15 extended from the net
unit 5 can be wound on the head frame 3, and the strings 15 extended from
the net unit 5 are coated by high elastic tubes 19 in the oblique grooves 13.
The present invention provides the racket having the excellent
elastic and repellent force by increasing tension in string, and constantly
maintains the interval of the strings 13 crossing each other in the net unit 5
so that users do not have to adjust the interval of the strings 13 during the
ball game such as tennis.
Figs. 6 and 7 respectively illustrate a racket in accordance with a
second embodiment of the present invention, including an elliptical head
frame, a net unit installed along the inner surface of the head frame, a neck
unit formed in the long axis direction of the head frame, and a handle unit
extended from the neck unit. Here, oblique grooves 13 are consecutively
rounded in the width direction of the head frame 3 along the outer
circumference of the head frame 3 so that strings 15 extended from the net
unit 5 can be wound on the head frame 3, grooves 21 are formed on the outer circumference of the head frame 3 in the longitudinal direction, high
elastic tapes 16 are adhered to the outer surfaces of the grooves 21, and
the strings 15 extended from the net unit 5 are coated by high elastic tubes
19 in the oblique grooves 13.
That is, the present invention increases the tension in string by
forming the grooves 21 on the outer circumference of the head frame 3 in
the longitudinal direction, and adhering the high elastic tapes 17 to the
outer surfaces of the grooves 21. As shown in Fig. 8, oblique grooves 13-1
can be formed at the center portions of oblique protruding units 14
protruded from the outer circumference of the head frame 3 in the same
direction. Accordingly, the grooves 13-1 are prevented from being caved
into the head frame 3 not to reduce the strength of the head frame 3 like
the grooves 13 of Fig. 5.
Referring to Figs. 9 and 10, gas 18 is filled in a space unit formed by
a head frame 3, a neck unit 7 and a handle unit 9, and a lower end unit 11
having a lower end groove formed to be incorporated with a gas injection
unit 16 is formed at the end of the handle unit 9. Here, the gas injection unit
16 is installed on the inwardly-caved surface of the lower end unit 11 not
to be exposed to the outside environment. As illustrated in Fig. 11, a high
elastic tube 23 is adhered to the whole inner surface of the incorporated structure of a head frame 3, a neck unit 7 and a handle unit 9, to increase
elasticity of a racket 1, Even if cracks are generated in the racket 1 due to
poor formation and long time use, internal filling gas is prevented from
being leaked, to maintain elasticity of the racket.

Claims

WHAT IS CLAIMED IS:
1. A racket being improved elastic and repellent force comprising:
an elliptical head frame;
a net unit installed along the inner surface of the head frame;
a neck unit formed in the long axis direction of the head frame;
a handle unit extended from the neck unit; and
oblique grooves being consecutively rounded along the outer
circumference of the head frame in the width direction of the head frame so
that strings extended from the net unit can be wound on the head frame.
2. The racket of claim 1, wherein protruding units are formed on the
outer circumference of the head frame, and oblique grooves are formed at
the center portions of the protruding units.
3. The racket of claim 1 or 2, wherein high elastic tapes are adhered
to the outer surfaces of the oblique grooves.
4. The racket of claim 1 or 2, wherein grooves are formed on the
outer circumference of the head frame in the longitudinal direction, and high elastic tapes are adhered to the outer surfaces of the grooves.
5. The racket of claim 1 or 2, wherein the strings extended from the
net unit are coated by high elastic tubes in the oblique grooves to prevent
abrasion.
6. The racket of claim 3, wherein the strings extended from the net
unit are coated by high elastic tubes in the oblique grooves to prevent
abrasion.
7. The racket of claim 4, wherein the strings extended from the net
unit are coated by high elastic tubes in the oblique grooves to prevent
abrasion.
8. The racket of claim 1, wherein the oblique grooves are formed in
a part of the outer circumference of the head frame.
9. The racket of claim 1, wherein gas is filled in a space unit formed
by the head frame, the neck unit and the handle unit.
10. The racket of claim 9, wherein a high elastic tube is installed in
the space unit, and the gas is filed through the high elastic tube.
11. The racket of claim 9 or 10, wherein the gas filled in the space
unit is helium gas.
12. The racket of claim 9 or 10, wherein the gas filled in the space
unit is compression air.
13. The racket of claim 9 or 10, wherein a lower end unit
incorporated with a gas injection unit is hermetically sealed to the end of
the handle unit.
14. The racket of claim 13, wherein the gas injection unit is a valve
device.
PCT/KR2002/001626 2001-08-30 2002-08-29 Racket being improved elastic and repellent force WO2003018143A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/487,930 US20040209715A1 (en) 2001-08-30 2002-08-29 Racket being improved elastic and repellent force

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR2001-26449U 2001-08-30
KR2020010026450U KR200256969Y1 (en) 2001-08-30 2001-08-30 Racket being improved elastic and repellent force
KR2001-26450U 2001-08-30
KR2020010026449U KR200256968Y1 (en) 2001-08-30 2001-08-30 Racket being improved elastic and repellent force

Publications (1)

Publication Number Publication Date
WO2003018143A1 true WO2003018143A1 (en) 2003-03-06

Family

ID=26639079

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2002/001626 WO2003018143A1 (en) 2001-08-30 2002-08-29 Racket being improved elastic and repellent force

Country Status (3)

Country Link
US (1) US20040209715A1 (en)
CN (1) CN1246054C (en)
WO (1) WO2003018143A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2599009A (en) * 2020-09-07 2022-03-23 Blair Wylde Brown A device for hitting a ball

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201343221A (en) * 2012-04-16 2013-11-01 rong-shi Zhang Suspension type racquet stringing component and racquet comprising the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02264675A (en) * 1989-04-04 1990-10-29 Hiroshi Kikuchi Tennis racket resiliency reinforcing and adjusting, shock absorbing and adjusting, and racket weight decreasing device
US5823899A (en) * 1996-07-24 1998-10-20 Dunlop Slazenger Group Limited Games racket frame
US6062994A (en) * 1998-04-10 2000-05-16 Ef Composite Technologies, L.P. Reinforced racquet with flat string bed

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02264675A (en) * 1989-04-04 1990-10-29 Hiroshi Kikuchi Tennis racket resiliency reinforcing and adjusting, shock absorbing and adjusting, and racket weight decreasing device
US5823899A (en) * 1996-07-24 1998-10-20 Dunlop Slazenger Group Limited Games racket frame
US6062994A (en) * 1998-04-10 2000-05-16 Ef Composite Technologies, L.P. Reinforced racquet with flat string bed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2599009A (en) * 2020-09-07 2022-03-23 Blair Wylde Brown A device for hitting a ball

Also Published As

Publication number Publication date
CN1549735A (en) 2004-11-24
CN1246054C (en) 2006-03-22
US20040209715A1 (en) 2004-10-21

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