GB2260931A - Method of making a badminton racket with head frame,shaft,and hand grip made integrally into a unitary body - Google Patents

Method of making a badminton racket with head frame,shaft,and hand grip made integrally into a unitary body Download PDF

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Publication number
GB2260931A
GB2260931A GB9123171A GB9123171A GB2260931A GB 2260931 A GB2260931 A GB 2260931A GB 9123171 A GB9123171 A GB 9123171A GB 9123171 A GB9123171 A GB 9123171A GB 2260931 A GB2260931 A GB 2260931A
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United Kingdom
Prior art keywords
cellophane
blow tube
badminton racket
making
tubular piece
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9123171A
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GB9123171D0 (en
GB2260931B (en
Inventor
Pi-Tuan Lo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LO PI TUAN
Original Assignee
LO PI TUAN
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
Application filed by LO PI TUAN filed Critical LO PI TUAN
Priority to GB9123171A priority Critical patent/GB2260931B/en
Publication of GB9123171D0 publication Critical patent/GB9123171D0/en
Publication of GB2260931A publication Critical patent/GB2260931A/en
Application granted granted Critical
Publication of GB2260931B publication Critical patent/GB2260931B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/10—Frames made of non-metallic materials, other than wood
    • A63B49/11—Frames made of non-metallic materials, other than wood with inflatable tubes, e.g. inflatable during fabrication
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • A63B2209/023—Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
    • B29L2031/5245—Rackets

Abstract

The badminton racket is moulded from a carbonaceous fibre reinforced epoxy resin which is wrapped around a cone comprising a rigid tubular piece (51) which forms the shaft, a "cellophane" blow tube (57) e.g. of nylon, of small diameter which forms the head-frame, and "cellophane" blow tube (58) of larger diameter which forms the hand grip. The rigid tubular piece (51) consists of an elongated connection portion (52) located at one end and which at its other end may extend to an air inlet (53) through the larger diameter tube (58) in which it is provided with radial air discharge perforations (55). The small blow tube (57) is fastened at one end thereof to the connection portion (52) of the tubular piece 51 and is sealed tight at other end thereof. The cone wrapped windingly with resin impregnated carbonaceous fiber fabrics (60) is placed in a molding cavity to form a badminton racket under the air pressure within the tubes (57, 58), and heat. <IMAGE>

Description

METHOD OF MAKING A BADMINTON RACKET WITH HEAD FRAME, SHAFT, AND HAND GRIP MADE INTEGRALLY INTO A UNITARY BODY BACKGROUND OF THE INVENTION The present invention relates to the method of making a badminton racket, and more particularly to the method of making a badminton racket which is of unitary construction and is made from carbonaceous fiber.
According to the prior art method of making a badminton racket made from carbonaceous fiber, a cellophane blow tube 12 ( a soft nylon tube resistant to high temperature ) is manually wrapped and encircled with the carbonaceous fiber fabric 11, as shown in FIG. 1, and is then placed in a molding cavity 13 as shown in FIG. 2. After the molding cavity 13 is closed securely, the high-pressure air is blown into the cellophane blow tube 12 so as to cause the carbonaceous fiber fabric 11 to attach intimately to the inner wall of the molding cavity 13. This process is allowed to take place under heat for a predetermined period of time until the resin contained in the carbonaceous fiber fabric 11 has cured to take form of a racket blank 15 , as shown in FIG. 3.Such prior art method described above can not be used to make a badminton racket with shaft 16 and hand grip 18 thereof being made into a unitary body because of the facts that the cellophane blow tube 12 is of a tubular construction having uniform diameter throughout and that the cellophane blow tube 12 can not be made into a tapered one or into a tube having segments different in diameter. In accordance with the prior art method, a cellophane blow tube 12 smaller in diameter than the shaft 16 of the racket blank 15 is wrapped around by a carbonaceous fiber fabric 11 and is subsequently placed into a molding cavity 13, in which the head frame 17 and the shaft 16 are formed into a unitary body. Thereafter, the hand grip 18, which is formed separately, is fitted around the lower end portion of the shaft.
The badminton racket made by the prior art method described above is defective in design in that its hand grip 18 is made separately and is then adhered to the lower end portion of its shaft 16. Therefore, there is an additional work to be done in the process of making such badminton racket. In addition, the hand grip 18 is susceptible to being detached from the shaft 16 after a prolonged usage of the racket. Furthermore, the cellophane blow tube 12, which is a soft nylon tube, can be easily and accidentally folded in the course of being wrapped around manually with the carbonaceous fiber fabric 11, thereby resulting in the cellophane blow tube 12 unable to expand fully when the high-pressure air is blown into it. As a result, the wall of the cellophane blow tube 12 will have uneven thickness, as shown in FIG. 4.The resin contained in the carbonaceous fiber fabric 11 is flowable in its uncured state. Therefore, the high-pressure air blown into the cellophane blow tube 12 will force the folded wall of cellophane blow tube 12 into the inner layer of the carbonaceous fiber fabric 11, thereby causing the resin contained in the carbonaceous fiber fabric 11 to flow around to result in an uneven distribution of resin in the cross section of the racket. Such racket, especially its shaft 16, is structurally weak and is vulnerable to breakage upon hitting a ball.
In order to overcome the shortcomings described above, this inventor has devised a remedy, in which the shaft and the hand grip are made simultaneously into a unitary body by means of the connected cellophane blow tubes of different diameters. However, such method is also defective in design in that it has not truly overcome the shortcomings of the prior art method of wrapping the cellophane blow tube with the carbonaceous fiber fabric, and that it is technically difficult to connect cellophane blow tubes of different diameters in a leakproof manner, and further that the high-pressure air is blown first into the cellophane blow tube which has the largest diameter and is to form the hand grip of the racket, with the cellophane blow tubes of smaller diameters receiving less air pressure.As a result, the racket made by method will have a hand grip, which is superior to the shaft and the head frame in terms of structural integrity.
SUMMARY OF THE INVENTION It is therefore the primary objective of the present invention to provide the method of making a badminton racket with means whcih permits the carbonaceous fiber fabric to wrap around the cellophane blow tube forming the shaft in such a manner that the uniform thickness of the layer of the carbonaceous fiber fabric is attained.
It is another objective of the present invention to provide the method of making a badminton racket with means which permits the cellophane blow tubes of different diameters to be connected securely in a leakproof manner.
It is still another objective of the present invention to provide the method of making a badminton racket with means which permits the high-pressure air to be blown first into the cellopnane blow tube forming the head frame of the racket so as to ensure that the structural integrity of the head frame so made is not compromised.
In keeping with the principles of the present invention, the objectives of the present invention are accomplished by the method making a badminton racket with head frame, shaft, and hand grip thereof made integrally into a unitary body, in which a cellophane blow tube wrapped windingly with the carbonaceous fiber fabric is placed into the molding cavity. Thereafter, the molding cavity is closed securely to allow the high-pressure air to be blown into the cellophane blow tube to cause the outer layer of the carbonaceous fiber fabric to attach intimately to the inner wall of the mold cavity. After the curing process of resin contained in the carbonaceous fiber fabric under heat is completed, the intended badminton racket is produced.Such method is characterized in that the cellophane blow tube is attached at one end thereof to a tubular body made of hard material in such a manner that it communicates with the axial hole of the tubular body wrapped windingly with the carbonaceous fiber fabric. The carbonaceous fiber fabric wrapping windingly the cellophane blow tube forms the head frame, while the carbonaceous fiber fabric wrapping windingly the tubular body is molded into the shaft which has uniform thickness in its cross section and comprises therein the tubular body to reinforce the strength thereof. In addition, the tubular body is attached at other end thereof to another cellophane blow tube, which has a diameter larger than that of the one forming the head frame and is also wrapped windingly with the carbonaceous fiber fabric, in such a manner that its axial hole communicates with the cellophane blow tube. The carbonaceous fiber fabric wrapping around this cellophane blow tube forms the hand grip.
The present invention is further characterized in that the tubular body is attached at one end thereof to the cellophane blow tube having a larger diameter in such a manner that it passes throught and beyond the cellophane blow tube to form an air inlet. In addition, the other end of the large cellophane blow tube is disposed securely on the air inlet of the tubular body so as to form a closed chamber. The tubular body communicates with the closed chamber by means of a plurality of perforations of predetermined size so as to permit the high-pressure air to enter the closed chamber. In the meantime, some of the high-pressure air blown into the tubular body is allowed to enter the small cellophane blow tube.
The air can be blown first into the head frame and then into the hand grip in order to ensure that the structural integrity of the racket is attained.
The objectives, features, and functions of the present invention can be better understood by studying the following detailed description of the preferred embodiments, in conjunction with the drawings provided herewith.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a schematic view of a cellophane blow tube wrapped windingly with the carbonaceous fiber fabric according to the prior art.
FIG. 2 shows a schematic view of a cellophane blow tube which is wrapped windingly with the carbonaceous fiber fabric as shown in FIG. 1 and is placed in the molding cavity.
FIG. 3 shows a three-dimensional view of the racket blank produced by the prior art method.
FIG. 4 is a sectional view of the portion taken along the line 4-4, as shown in FIG. 3, to show the structure of the shaft.
FIG. 5 shows an external three-dimensional view of the blowing and molding apparatus of the first preferred embodiment of the present invention.
FIG. 6 shows a sectional view of the pre-impregnated carbonaceous fiber fabric as shown in FIG. 5.
FIG 7 shows a view of a blowing and molding apparatus which is wrapped windingly with the carbonaceous fiber as shown in FIG. 6 and is placed in the molding tool.
FIG. 8 shows an external three-dimensional view of the blowing and molding apparatus of the second preferred embodiment of the present invention.
FIG. 9 shows a schematic view of blowing and molding according to the second preferred embodiment of the present invention.
FIG. 10 shows an enlarged schematic view of the hand grip and the shaft as shown in FIG. 9.
FIG. 11 shows a partial exploded view of the third preferred embodiment of the present invention.
FIG. 12 shows an external view of the formed racket blank of the third preferred embodiment of the present invention, with the blow tubes having been removed therefrom.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 5, 6, and 7, the first preferred embodiment of the present invention is shown comprising a blowing and molding apparatus 20, which in turn is provided with a tubular piece 21, a cellophane blow tube 22 having a small diameter, a cellophane blow tube 24 having a large diameter. The tubular piece 21 is of an elongated rod-shaped construction with an outer diameter smaller than that of the shaft of racket. The small cellophane blow tube 22 is fastened at one end thereof to one end of the tubular piece 21 in such a manner that it communicates with the axial hole 23 of the tubular piece 21. The other end of the small cellophane blow tube 22 is sealed tight. The other end of the tubular piece 21 is coupled with one end of the large cellophane blow tube 24.The other end of the large cellophane blow tube 24 is provided with an air inlet 25.
The blowing and molding apparatus 20 is wrapped around with the carbonaceous fiber fabric 30 pre-impregnated in the thermosetting epoxy resin, as shown in FIG. 6. The cross section of the hand grip is greater than those of head frame and shaft. For this reason, the hand grip must be provided with an additional expansion allowance when it is wrapped around with the carbonaceous fiber fabric. In addition, the wrapping of the tubular piece 21 with the carbonaceous fiber fabric 30 can be done manually or mechanically, because the tubular piece 21 of the blowing and molding apparatus 20 forms the shaft of racket.
The blowing and molding apparatus 20 wrapped around with the carbonaceous fiber fabric 30 is then placed in the molding tool 40, as shown in FIG. 7. Thereafter, the high-pressure gas on the order of 2-10 kg/cm2 is injected into the tubular piece 21 via the air inlet 25, and the blowing and molding apparatus 20 is treated under heat in the range of 100 to 200 degrees in Celsius for about 30 minutes. The molding tool 40 can be subsequently opened to remove therefrom a racket blank with the tubular piece 21 remaining therein to give an added strength to the shaft.
Now referring to FIGS. 8 to 10, the blowing and molding apparatus 50 of the second preferred embodiment of the present invention is shown comprising a tubular piece 51 made of heat-resistant plastic material or lightweight metal such as aluminum, a cellophane blow tube 57 having a small diameter, and a cellophane blow tube 58 having a large diameter. The tubular piece 51 is provided at one end thereof with a connection portion 52 and at other end thereof with an air inlet 53 comprising insertion grooves 54 arranged circularly along the outer wall thereof. The tubular piece 51 is radially composed of a plurality of perforations 55 in communication with the axial hole 56 thereof.The one end of the small cellophane blow tube 57 is fastened securely to the connection portion 52 and is in communication with the axial hole 56, while the other end of the small cellophane blow tube 57 is sealed tight so that the small cellophane blow tube 57 forms the first air chamber. The one end of the large cellophane blow tube 58 is foled inside out and is fastened securely to a predetermined position of the small cellophane blow tube 57, while the othet end of the large cellophane blow tube 58 is disposed securely on the air inlet 53 so as to form a second gas chamber between the small cellophane blow tube 57 and the large cellophane blow tube 58. The sceond air chamber communicates with the axial hole 56 by means of perforations 55.
The blowing and molding apparatus 50 is wrapped auound with the carbonaceous fiber fabric 60 and is then placed in the molding tool 70 in such a manner that the molding tool 70 engages securely the insertion grooves 54 of the air inlet 53. The molding tool 70 containing the blowing and molding apparatus 50 is placed in the oil-pressured molding machine.The air pressure on the order of 2Q 0.5kg/cm2 is introduced into the first air chamber via the air inlet 53 and through the axial hole 56 so that the small cellophane blow tube 57 is inflated rapidly to cause the carbonaceous fiber fabrid 60 wrapping thereon to take form, while the rest of the introduced high-pressure air enters the second air chamber via perforations 55 so that the large cellophane blow tube 58 expands gradually until such time when the air pressure inside the small cellophane blow tube 57 has reached the point corresponding to the maximum air pressure blown thereinto so that the high pressure air is forced into the second air chamber in a large quantity to cause the second air chamber to expand to take from for about two minutes until the temperature of the molding tool 70 has reached 100 degrees in Celsius.
Thereafter the temperature is further raised to 145-148 degrees in Celsius, while the pressure is increased to 7.5# 0.5kg/cm2 for about 30 minutes until the thermosetting resin contained in the carbonaceous fiber fabric has cured completely. The racket blank so formed can be then removed from the molding tool 70. Of course, the air inlet 53 has to be removed from the racket blank.
As shown in FIGS. 11 and 12, the second preferred embodiment of the present invention described above can be further improved. The tubular piece 80 is provided with a neck portion 81 and a body portion 82, which are detachably connected. The neck portion 81 comprises at free end thereof a connection portion 83 for connecting thereto one end of the small cellophane blow tube 84.
The neck portion 81 further comprises a connection end intended to fasten thereto the large cellophan blow tube 85. The body portion 82 consists of a plurality of perforations 86 and of an air inlet 87 located at the free end thereof for coupling with the large cellophane blow tube 85 Such arrangements as described above are advantageous in that the body porition 82 made of plastic or metal material can be removed from the racket blank for later use again and for reducing the weight of racket, and that the meck portions 81 made of plastic material is kept in the racket to give the shaft an added strength in construction, as shown in FIG. 12.
In conclusion, the advantages of the present invention are further expounded hereinafter.
According to the present invention, the shaft is provided with a round rod made of rigid material so as to facilitate the carbonaceous fiber fabric to wrap around manually or mechanically the neck portion of the blow tube in such a manner that the shaft so made is provided with a uniform thickness in its cross section.
The present invention provides means enabling the cellophane blow tubes of different dimensions to be attached thereto in a leakproof manner.
According to the present invention, the first air chamber forms the head frame of racket while the second air chamber takes the shape of the hand grip of racket. The high-pressure air is blown first into the first air chamber and subsequently into the second air chamber so as to permit the carbonaceous fiber fabric wrapping around the head frame and the shaft to expand first in order to take form. In case the head frame and the shaft are not properly wrapped around with the carbonaceous fiber fabric, the internal stress generated in the head frame and the shaft during the molding process can be gradually transmitted to the hand grip so as to ensure that structural integrity of the head frame and the shaft is not compromised.
In accordance with the present invention, the cellophane blow tubes are folded inside out to be coupled with so that the air pressure inside the air chambers can exert the pressure on the inner side of the connection portion, as shown in FIG. 10. so as to ensure that the connection portions of the blow tubes are sceurely adhered in a leakproof manner.
The present invention provides a blow tube which can be made of lightweight metal such as aluminum alloy and can be removed from the racket blank via the opening end of the hand grip for repeated use later. Furthermore, the blow tube used in the present invention can be made of plastic material and remained in the racket so as to give the shaft an added strength in construction.
The embodiments of the present invention described above are to be considered in all respects as merely illustrative of principles of the present invention, Accordingly, the present invention is to be limited only by the scope of the hereinafter appended claims.

Claims (10)

  1. WHAT I CLAIM IS:
    I. Method of making a badminton racket comprising cellophane blow tube, carbonaceous fiber fabrics, rigid tubular piece baving an axial hole, and molding cavity, said cellophane blow tube and said tubular piece being wrapped windingly with said carbonaceous fiber fabrics and being subsequently placed into said molding cavity in which the high-pressure air is blown into said cellophane blow tube to expand to cause the outer layer of said carbonaceous fiber fabrics to adhere securely to the inner wall of said molding cavity, and in which the resin contained in said carbonaceous fiber fabric is cured under heat so that a badminton racket is formed, with head frame, shaft, and hand grip thereof made integrally into a unitary body, said method being characterized in that said cellophane blow tube is attached at one end thereof to said rigid tubular piece and is in communication with the axial hole of said rigid tubular piece, and that said carbonaceous fiber fabric wrapping said cellophane blow tube forms said head frame, and further that said carbonaceous fiber fabric wrapping said rigid tubular piece forms said shaft having uniform thickness in its cross section.
  2. 2. Method of making a badminton racket according to claim 1, wherein said tubular piece is coupled securely at one end thereof with a cellophane blow tube, which has a diameter greater than that of said cellophane blow tube forming said head frame, in such a manner that its axial hole is in communication with said cellophane blow tube having a larger diameter and being wrapped windingly with a carbonaceous fiber fabric which forms said hand grip.
  3. 3. Method of making a badminton racket according to claim 2, wherein said tubular piece is coupled with said cellophane blow tube in such manners that it passes through and beyond said cellophane blow tube to form an air inlet located outside said cellophane blow tube, and that said cellophane blow tube is disposed at one end thereof on said air inlet so that a sealed air chamber is formed, and further that said tubular piece communicates with said air chamber by means of a plurality of perforations thereof.
  4. 4. Method of making a badminton racket according to claim 2, wherein one end of said cellophane blow tube is fastend to said tubular piece in such a manner that it is foled inside out.
  5. 5. Method of making a badminton racket according to claim 1 comprising a blowing and heating process, which includes an injection of air pressure on the order of 1.5-2.5kg/cm2 into said cellophane blow tube, a subsequent increase in the temperature to 100 degrees in Celsius for a period ranging form 1.5 to 2.5 minutes, and thereafter a further increase in the air pressure to 6-10kg/cm2, preferably 7-8kg/cm2, under the temerature in the range of 100 to 200 degrees in Celsius, preferably 140 to 150 degrees in Celsius, for 20 to 30 minutes.
  6. 6. Method of making a badminton racket according to claim 1, or 2, or 3, or 4, or 5, wherein the part or the whole of said blow tube can be removed from the formed racket immediately after the completion of blowing and heating process so as to reduce the weight of the racket so made.
  7. 7.Method of making a badminton racket, substantially as hereinbefore described with reference to Figures 5, 6 and 7 of the accompanying drawings.
  8. 8. Method of making a badminton racket, substantially as hereinbefore described with reference to Figures 8, 9 and 10 of the accompanying drawings.
  9. 9. Method of making a badminton racket, substantially as hereinbefore described with reference to Figures 11 and 12 of the accompanying drawings.
  10. 10. A badminton racket made by a method according to any one of the preceding claims.
GB9123171A 1991-11-01 1991-11-01 Method of making a badminton racket with head frame,shaft,and hand grip made integrally into a unitary body Expired - Fee Related GB2260931B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9123171A GB2260931B (en) 1991-11-01 1991-11-01 Method of making a badminton racket with head frame,shaft,and hand grip made integrally into a unitary body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9123171A GB2260931B (en) 1991-11-01 1991-11-01 Method of making a badminton racket with head frame,shaft,and hand grip made integrally into a unitary body

Publications (3)

Publication Number Publication Date
GB9123171D0 GB9123171D0 (en) 1991-12-18
GB2260931A true GB2260931A (en) 1993-05-05
GB2260931B GB2260931B (en) 1995-07-05

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GB9123171A Expired - Fee Related GB2260931B (en) 1991-11-01 1991-11-01 Method of making a badminton racket with head frame,shaft,and hand grip made integrally into a unitary body

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB648034A (en) * 1948-11-10 1950-12-28 Halex Ltd Improvements in or relating to table tennis and like bats
GB1498892A (en) * 1974-01-30 1978-01-25 Starwin Ind Inc Racket manufacture
GB1554353A (en) * 1976-07-13 1979-10-17 Bosch Gmbh Robert Tennis rackets
GB2075412A (en) * 1980-05-05 1981-11-18 Kun Nan Lo Producing reinforced composite racket frame
EP0040492A2 (en) * 1980-05-21 1981-11-25 Mitsubishi Rayon Co., Ltd. Moulding material for fibre reinforced plastic tubes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB648034A (en) * 1948-11-10 1950-12-28 Halex Ltd Improvements in or relating to table tennis and like bats
GB1498892A (en) * 1974-01-30 1978-01-25 Starwin Ind Inc Racket manufacture
GB1554353A (en) * 1976-07-13 1979-10-17 Bosch Gmbh Robert Tennis rackets
GB2075412A (en) * 1980-05-05 1981-11-18 Kun Nan Lo Producing reinforced composite racket frame
EP0040492A2 (en) * 1980-05-21 1981-11-25 Mitsubishi Rayon Co., Ltd. Moulding material for fibre reinforced plastic tubes

Also Published As

Publication number Publication date
GB9123171D0 (en) 1991-12-18
GB2260931B (en) 1995-07-05

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19981101