US3787051A - Continuous fiber tennis racquet - Google Patents

Continuous fiber tennis racquet Download PDF

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Publication number
US3787051A
US3787051A US00067882A US3787051DA US3787051A US 3787051 A US3787051 A US 3787051A US 00067882 A US00067882 A US 00067882A US 3787051D A US3787051D A US 3787051DA US 3787051 A US3787051 A US 3787051A
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handle
along
throat
around
head
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US00067882A
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Dyke Johns H Van
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DYKE JOHNS H VAN
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DYKE JOHNS H VAN
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    • 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
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • 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
    • 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
    • A63B2209/026—Ratio fibres-total material
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A63B60/08—Handles characterised by the material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S273/00—Amusement devices: games
    • Y10S273/07—Glass fiber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S273/00—Amusement devices: games
    • Y10S273/23—High modulus filaments

Definitions

  • ABSTRACT A tennis racquet composed entirely, except for the strings and a leather handle cover, of resin impregnated glass fibres approximately 25 percent of which extend unbrokenly up one handle, around the bow including the throat, around the head and down the other handle, approximately 50 percent of which extend up one handle around the head and then down the other handle, and approximately 25 percent of which extend up one handle member, across the throat and then down the other handle member. Short fibres are positioned across the throat to make the throat contain a number of fibres equal to that of any other portion of the racquet.
  • This invention relates to a tennis racquet and more particularly to such a racquet the body of which is composed entirely of glass fibres impregnated with a thermosetting resin. For improved strength it is desirable to form the racquet, so far as it is possible, of continuous unbroken fibres. However, due to the peculiar shape of a tennis racquet it is not possible to achieve this ideal. Hence this invention is in essence an attempt to use in the structure of a racquet as many continuous unbroken fibres as possible and yet still make a balanced racquet having a uniform cross-section in all parts of the bow, even including the throat.
  • FIG. 1 is a plan view of a pair of molds suitable for making the racquet of this invention, the molds being shown in their open position.
  • FIG. 2 is a fragmentary cross-section taken along line 2-2 of FIG. 1.
  • FIG. 3 is a view similar to 'FIG. 2, but showing the mold filled and closed.
  • FIGS. 4-6 is a diagram of the position in which approximately 50 percent of the glass fibres are laid in the mold.
  • FIGS. 5-7 is a diagram of the position in which approximately 25 percent of the glass fibres are laid in the mold.
  • FIG. 8 is a diagram of the position in which approximately 25 percent of the glass fibres are laid in the mold.
  • FIG. 1 illustrates a mold formed in two halves l0 and 11 hinged together by a hinge 12.
  • Each half 10 and 11 is provided with a groove 13 or 14 which grooves trace the outline of a tennis racquet frame. That is to say, each groove has a head portion 15, a throat portion 16 and two handle portions 17 and 18.
  • glass fibers are arranged with about 204 unidirectionally extending filaments in a unit known as a sliver.
  • E glass designates the composition and stands for electrical" versus chemical”.
  • K represents a filament-diameter of about 0.00055 inch.
  • the first step comprises laying 50 bundles into the molds in the pattern shown in FIGS. 4-6, that is to say, up one handle, around the headand down the other handle.
  • the second step comprises laying bundles into the molds in the pattern shown in FIGS. 5-7, that is to say, up one handle, completely around the bow, around the head and then down the other handle.
  • the third step comprises laying into the molds 50 bundles in the pattern shown in FIG. 8, that is to say, up one handle, across the throat and down the other handle. Concurrently short bundles are laid across the throat only.
  • the fourth step comprises a repeat of the second step; i.e., an additional 25 fibres are laid in the pattern of FIGS. 5-7.
  • the fifth step is a repeat of the first step; i.e., another 50 bundles are laid in the pattern of FIGS. 4-6. This process is continued until both molds l3 and 14 are filled. The molds are then closed and the material in the molds is cured, preferably by energizing the heating elements 20 and 21 and curing the racquet for 30 minutes at 200-225 F.
  • the racquet After curing the racquet is removed from the molds and is complete except for fitting a handle to the two handle portions formed in portions 17 and 18 of the mold, boring the holes in the head of the racquet and stringing.
  • glass as used herein is defined as fibre glass, or alternately any of the commercially available materials generally described as carbon graphite Boron high modulus glass, or any mixture of the former with the latter.
  • a tennis racquet frame composed entirely of resin impregnated continuous unidirectional reinforcing fibers and having spaced handle portions joined to a head bow and a throat portion extending between said handle portions to complete, with said head bow, a closed head loop, the improvement comprising:
  • a second plurality of unbroken continuous fibers extending along one handle portion, along said throat portion, and along the other handle portion.
  • a tennis racquet as defined in claim 1 including a third plurality of continuous unbroken fibers extending along one handle portion, around said head bow, and then along the other handle portion.
  • a tennis racquet as defined in claim 2 including a fourth plurality of unbroken glass fibers extending along only said throat portion, there being substantially the same number of glass fibers extending along each handle portion, around said head bow, and along said throat portion.

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  • 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)
  • Golf Clubs (AREA)

Abstract

A tennis racquet composed entirely, except for the strings and a leather handle cover, of resin impregnated glass fibres approximately 25 percent of which extend unbrokenly up one handle, around the bow including the throat, around the head and down the other handle, approximately 50 percent of which extend up one handle around the head and then down the other handle, and approximately 25 percent of which extend up one handle member, across the throat and then down the other handle member. Short fibres are positioned across the throat to make the throat contain a number of fibres equal to that of any other portion of the racquet.

Description

H110 Johns States Patent 1191 1 1 CONTINUOUS FIBER TENNIS RACQUET [22] Filed: Aug. 28, I970 21 App1.No.: 67,882
[52] US. Cl 2 73/73 F, 273/D1G. 7 [51] Int. Cl A63b 49/10 [58] Field of Search 273/67 R, 73, DIG. 7; 124/23 [56] References Cited UNITED STATES PATENTS 2,980,158 4/1961 Meyer 273/73 F 3,483,055 12/1969 Eshbaugh 273/73 F X 2,878,020 3/1959 Robinson 273/73 F 2,980,158 4/1961 Meyer 273/73 F FOREIGN PATENTS OR APPLICATIONS 577,560 6/1924 France 273/73 F 962,312 12/1949 France 273/73 K 1,310,470 10/1962 Francelm, 273/73 D 307,157 3/1929 Great Britain 273/73 K 255,039 10/1927 Italy 273/73 K 848,826 8/1970 Canada 273/73 F 17,462 5/1934 Australia 273/73 F AWFQ'G/Vflfffi 50 FEE/Q5 Jan. 22, 1974 Primary Examiner-Richard C. Pinkham Assistant Examiner Richard J. Apley Attorney, Agent, or Firm-Lyon & Lyon [57] ABSTRACT A tennis racquet composed entirely, except for the strings and a leather handle cover, of resin impregnated glass fibres approximately 25 percent of which extend unbrokenly up one handle, around the bow including the throat, around the head and down the other handle, approximately 50 percent of which extend up one handle around the head and then down the other handle, and approximately 25 percent of which extend up one handle member, across the throat and then down the other handle member. Short fibres are positioned across the throat to make the throat contain a number of fibres equal to that of any other portion of the racquet.
3 Claims, 8 Drawing Figures CONTINUOUS FIBER TENNIS RACQUET INTRODUCTION This invention relates to a tennis racquet and more particularly to such a racquet the body of which is composed entirely of glass fibres impregnated with a thermosetting resin. For improved strength it is desirable to form the racquet, so far as it is possible, of continuous unbroken fibres. However, due to the peculiar shape of a tennis racquet it is not possible to achieve this ideal. Hence this invention is in essence an attempt to use in the structure of a racquet as many continuous unbroken fibres as possible and yet still make a balanced racquet having a uniform cross-section in all parts of the bow, even including the throat.
This object and others will be apparent from the following description in which:
FIG. 1 is a plan view of a pair of molds suitable for making the racquet of this invention, the molds being shown in their open position.
FIG. 2 is a fragmentary cross-section taken along line 2-2 of FIG. 1.
FIG. 3 is a view similar to 'FIG. 2, but showing the mold filled and closed.
FIGS. 4-6 is a diagram of the position in which approximately 50 percent of the glass fibres are laid in the mold.
FIGS. 5-7 is a diagram of the position in which approximately 25 percent of the glass fibres are laid in the mold.
FIG. 8 is a diagram of the position in which approximately 25 percent of the glass fibres are laid in the mold.
Referring now more particularly to the drawings, FIG. 1 illustrates a mold formed in two halves l0 and 11 hinged together by a hinge 12. Each half 10 and 11 is provided with a groove 13 or 14 which grooves trace the outline of a tennis racquet frame. That is to say, each groove has a head portion 15, a throat portion 16 and two handle portions 17 and 18.
As known in the art, glass fibers are arranged with about 204 unidirectionally extending filaments in a unit known as a sliver. The term E glass designates the composition and stands for electrical" versus chemical". The term K represents a filament-diameter of about 0.00055 inch. (See Handbook of Reinforced plastics of the SP1, Oleesky and Mohr, pub. 1964 by Reinhold Pub. Corp, pp 117-166).
Glass fibres impregnated with a flexible epoxy resin of the amine type and B staged to a semicured state are laid in the grooves 13 and 1-4 in the following manner:
Bundles of E glass fibres of the K fibre diameter are used with approximately 60 slivers to the bundle. The first step comprises laying 50 bundles into the molds in the pattern shown in FIGS. 4-6, that is to say, up one handle, around the headand down the other handle. The second step comprises laying bundles into the molds in the pattern shown in FIGS. 5-7, that is to say, up one handle, completely around the bow, around the head and then down the other handle. The third step comprises laying into the molds 50 bundles in the pattern shown in FIG. 8, that is to say, up one handle, across the throat and down the other handle. Concurrently short bundles are laid across the throat only. The fourth step comprises a repeat of the second step; i.e., an additional 25 fibres are laid in the pattern of FIGS. 5-7. The fifth step is a repeat of the first step; i.e., another 50 bundles are laid in the pattern of FIGS. 4-6. This process is continued until both molds l3 and 14 are filled. The molds are then closed and the material in the molds is cured, preferably by energizing the heating elements 20 and 21 and curing the racquet for 30 minutes at 200-225 F.
After curing the racquet is removed from the molds and is complete except for fitting a handle to the two handle portions formed in portions 17 and 18 of the mold, boring the holes in the head of the racquet and stringing.
The term glass" as used herein is defined as fibre glass, or alternately any of the commercially available materials generally described as carbon graphite Boron high modulus glass, or any mixture of the former with the latter.
While there has been disclosed what at present is considered a preferred embodiment of the present invention it will be appreciated that various changes and modifications may be made therein without departing from the essence of the invention.
What is claimed is:
1. In a tennis racquet frame composed entirely of resin impregnated continuous unidirectional reinforcing fibers and having spaced handle portions joined to a head bow and a throat portion extending between said handle portions to complete, with said head bow, a closed head loop, the improvement comprising:
a first plurality of continuous unbroken fibers extending along one handle portion, around said head bow, along said throat portion, around said head bow again, and then along said other handle portion; and
a second plurality of unbroken continuous fibers extending along one handle portion, along said throat portion, and along the other handle portion.
2. A tennis racquet as defined in claim 1 including a third plurality of continuous unbroken fibers extending along one handle portion, around said head bow, and then along the other handle portion.
3. A tennis racquet as defined in claim 2 including a fourth plurality of unbroken glass fibers extending along only said throat portion, there being substantially the same number of glass fibers extending along each handle portion, around said head bow, and along said throat portion.

Claims (3)

1. In a tennis racquet frame composed entirely of resin impregnated continuous unidirectional reinforcing fibers and having spaced handle portions joined to a head bow and a throat portion extending between said handle portions to complete, with said head bow, a closed head loop, the improvement comprising: a first plurality of continuous unbroken fibers extending along one handle portion, around said head bow, along said throat portion, around said head bow again, and then along said other handle portion; and a second plurality of unbroken continuous fibers extending along one handle portion, along said throat portion, and along the other handle portion.
2. A tennis racquet as defined in claim 1 including a third plurality of continuous unbroken fibers extending along one handle portion, around said head bow, and then along the other handle portion.
3. A tennis racquet as defined in claim 2 including a fourth plurality of unbroken glass fibers extending along only said throat portion, there being substantially the same number of glass fibers extending along each handle portion, around said head bow, and along said throat portion.
US00067882A 1970-08-28 1970-08-28 Continuous fiber tennis racquet Expired - Lifetime US3787051A (en)

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889951A (en) * 1972-04-05 1975-06-17 Gen Dynamics Corp Laminated reinforcing facing for a game racket
US3892831A (en) * 1970-07-29 1975-07-01 Jacques Andre Robin Method of manufacture of tennis rackets of reinforced synthetic material
US3949988A (en) * 1972-06-08 1976-04-13 Fischer Gesellschaft M.B.H. Racket
US3953637A (en) * 1974-10-31 1976-04-27 United Technologies Corporation Slender rod for fishing rods and method of making the same
US3972529A (en) * 1974-10-07 1976-08-03 Mcneil Walter F Reinforced tubular materials and process
US3981504A (en) * 1974-03-18 1976-09-21 Ppg Industries, Inc. Glass-carbon reinforced foamed resin tennis racket frame
US3993308A (en) * 1968-01-08 1976-11-23 Jenks Herbert R Laminated fiberglass tennis racket
US4023799A (en) * 1974-01-24 1977-05-17 Exxon Research And Engineering Company Game racket
US4061520A (en) * 1975-11-17 1977-12-06 Fansteel Inc. Method of making composite high strength to weight structure
US4070020A (en) * 1976-07-07 1978-01-24 Fansteel Inc. Composite high strength to weight structure with fray resistance
US4070019A (en) * 1975-12-08 1978-01-24 Groves-Kelco Sales, Inc. Laminated game rackets and method of constructing same
US4070021A (en) * 1976-07-07 1978-01-24 Fansteel Inc. Composite high strength to weight structure having shell and sleeved core
US4082274A (en) * 1976-06-22 1978-04-04 Robert Stevens Tennis racket
US4098505A (en) * 1976-11-04 1978-07-04 Thompson Dale F Laminated fiber sport racket
US4099718A (en) * 1976-05-17 1978-07-11 Marcraft Recreation Inc. Racquet frame construction
US4123054A (en) * 1975-03-04 1978-10-31 Jacqueline Septier Tennis racket frame
US4145047A (en) * 1976-05-27 1979-03-20 Nippon Gakki Seizo Kabushiki Kaisha Racket
US4159114A (en) * 1976-03-12 1979-06-26 La Corporation Inglasco Ltee Ice hockey stick
US4192505A (en) * 1977-11-07 1980-03-11 Pepsico, Inc. Game racket
US4324400A (en) * 1979-08-08 1982-04-13 Est Industries, Inc. Table tennis bat blade
US4333643A (en) * 1980-02-19 1982-06-08 Victor Saffire Javelin
US4404053A (en) * 1980-02-19 1983-09-13 Victor Saffire Method of making a javelin
US4473229A (en) * 1982-04-02 1984-09-25 Kloppenburg Jerry K Golf ball utilizing graphite materials
US4489922A (en) * 1980-05-16 1984-12-25 Ford Motor Company Spring leaf comprising pultruded beam
US4506887A (en) * 1977-03-11 1985-03-26 Stanley Trysinsky Racket frame comprised of a single continuous filament and resin
US4579343A (en) * 1981-12-21 1986-04-01 Ektelon Graphite composite racquet
US4614626A (en) * 1984-04-27 1986-09-30 Frerking James R Method for fabricating a tennis racquet frame
US4706965A (en) * 1983-05-12 1987-11-17 John Schaar Arrow and components thereof
EP0432398A1 (en) * 1989-12-05 1991-06-19 Sumitomo Rubber Industries Ltd. Tennis racket frame
USRE34068E (en) * 1983-12-12 1992-09-15 Ektelon Racquetball raquet with increased hitting area
USRE34067E (en) * 1983-12-12 1992-09-15 Ektelon Racquetball racquet with increased hitting area improved racquetball racquet construction
GB2258158A (en) * 1991-08-02 1993-02-03 Kuni Tseng Seamless racket.

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE541831A (en) * 1900-01-01
FR577560A (en) * 1924-02-21 1924-09-08 Toulet Sa Des Ets New racket frame
GB307157A (en) * 1928-01-13 1929-03-07 Guglielmo Poletti Improvements in tennis rackets
GB449362A (en) * 1934-12-31 1936-06-25 Frank Wordsworth Donisthorpe Improvements in or relating to rackets or bats for tennis and like games
FR962312A (en) * 1950-06-07
GB695064A (en) * 1951-05-15 1953-08-05 Hugh Matheson Kerr Improvements in or relating to racquets
US2878020A (en) * 1949-12-16 1959-03-17 Roy H Robinson Racket for batting games
US2980158A (en) * 1958-04-10 1961-04-18 Parallel Products Company Method and mold for producing an archery bow
FR1310470A (en) * 1960-10-27 1962-11-30 Plastic string racket frame
FR1512401A (en) * 1966-12-21 1968-02-09 Tennis racket and device for its realization
US3483055A (en) * 1966-03-28 1969-12-09 Robert Wayne Eshbaugh Method for forming a fiber glass racket frame
CA848826A (en) * 1966-11-22 1970-08-11 Trysinsky Stanley Racket frame and the production methods

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE541831A (en) * 1900-01-01
FR962312A (en) * 1950-06-07
FR577560A (en) * 1924-02-21 1924-09-08 Toulet Sa Des Ets New racket frame
GB307157A (en) * 1928-01-13 1929-03-07 Guglielmo Poletti Improvements in tennis rackets
GB449362A (en) * 1934-12-31 1936-06-25 Frank Wordsworth Donisthorpe Improvements in or relating to rackets or bats for tennis and like games
US2878020A (en) * 1949-12-16 1959-03-17 Roy H Robinson Racket for batting games
GB695064A (en) * 1951-05-15 1953-08-05 Hugh Matheson Kerr Improvements in or relating to racquets
US2980158A (en) * 1958-04-10 1961-04-18 Parallel Products Company Method and mold for producing an archery bow
FR1310470A (en) * 1960-10-27 1962-11-30 Plastic string racket frame
US3483055A (en) * 1966-03-28 1969-12-09 Robert Wayne Eshbaugh Method for forming a fiber glass racket frame
CA848826A (en) * 1966-11-22 1970-08-11 Trysinsky Stanley Racket frame and the production methods
FR1512401A (en) * 1966-12-21 1968-02-09 Tennis racket and device for its realization

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993308A (en) * 1968-01-08 1976-11-23 Jenks Herbert R Laminated fiberglass tennis racket
US3892831A (en) * 1970-07-29 1975-07-01 Jacques Andre Robin Method of manufacture of tennis rackets of reinforced synthetic material
US3889951A (en) * 1972-04-05 1975-06-17 Gen Dynamics Corp Laminated reinforcing facing for a game racket
US3949988A (en) * 1972-06-08 1976-04-13 Fischer Gesellschaft M.B.H. Racket
US4023799A (en) * 1974-01-24 1977-05-17 Exxon Research And Engineering Company Game racket
US3981504A (en) * 1974-03-18 1976-09-21 Ppg Industries, Inc. Glass-carbon reinforced foamed resin tennis racket frame
US3972529A (en) * 1974-10-07 1976-08-03 Mcneil Walter F Reinforced tubular materials and process
US3953637A (en) * 1974-10-31 1976-04-27 United Technologies Corporation Slender rod for fishing rods and method of making the same
US4123054A (en) * 1975-03-04 1978-10-31 Jacqueline Septier Tennis racket frame
US4061520A (en) * 1975-11-17 1977-12-06 Fansteel Inc. Method of making composite high strength to weight structure
US4070019A (en) * 1975-12-08 1978-01-24 Groves-Kelco Sales, Inc. Laminated game rackets and method of constructing same
US4159114A (en) * 1976-03-12 1979-06-26 La Corporation Inglasco Ltee Ice hockey stick
US4099718A (en) * 1976-05-17 1978-07-11 Marcraft Recreation Inc. Racquet frame construction
US4145047A (en) * 1976-05-27 1979-03-20 Nippon Gakki Seizo Kabushiki Kaisha Racket
US4082274A (en) * 1976-06-22 1978-04-04 Robert Stevens Tennis racket
US4070021A (en) * 1976-07-07 1978-01-24 Fansteel Inc. Composite high strength to weight structure having shell and sleeved core
US4070020A (en) * 1976-07-07 1978-01-24 Fansteel Inc. Composite high strength to weight structure with fray resistance
US4098505A (en) * 1976-11-04 1978-07-04 Thompson Dale F Laminated fiber sport racket
US4506887A (en) * 1977-03-11 1985-03-26 Stanley Trysinsky Racket frame comprised of a single continuous filament and resin
US4192505A (en) * 1977-11-07 1980-03-11 Pepsico, Inc. Game racket
US4324400A (en) * 1979-08-08 1982-04-13 Est Industries, Inc. Table tennis bat blade
US4333643A (en) * 1980-02-19 1982-06-08 Victor Saffire Javelin
US4404053A (en) * 1980-02-19 1983-09-13 Victor Saffire Method of making a javelin
US4489922A (en) * 1980-05-16 1984-12-25 Ford Motor Company Spring leaf comprising pultruded beam
US4579343A (en) * 1981-12-21 1986-04-01 Ektelon Graphite composite racquet
US4473229A (en) * 1982-04-02 1984-09-25 Kloppenburg Jerry K Golf ball utilizing graphite materials
US4706965A (en) * 1983-05-12 1987-11-17 John Schaar Arrow and components thereof
USRE34068E (en) * 1983-12-12 1992-09-15 Ektelon Racquetball raquet with increased hitting area
USRE34067E (en) * 1983-12-12 1992-09-15 Ektelon Racquetball racquet with increased hitting area improved racquetball racquet construction
US4614626A (en) * 1984-04-27 1986-09-30 Frerking James R Method for fabricating a tennis racquet frame
EP0432398A1 (en) * 1989-12-05 1991-06-19 Sumitomo Rubber Industries Ltd. Tennis racket frame
GB2258158A (en) * 1991-08-02 1993-02-03 Kuni Tseng Seamless racket.

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