US3702701A - Metal tennis racket with plastic throat piece and molded plastic handle - Google Patents
Metal tennis racket with plastic throat piece and molded plastic handle Download PDFInfo
- Publication number
- US3702701A US3702701A US853676A US3702701DA US3702701A US 3702701 A US3702701 A US 3702701A US 853676 A US853676 A US 853676A US 3702701D A US3702701D A US 3702701DA US 3702701 A US3702701 A US 3702701A
- Authority
- US
- United States
- Prior art keywords
- racket
- strip
- plastic
- handle
- metal
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- A63B49/12—Frames made of metal
-
- 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
- A63B49/022—String guides on frames, e.g. grommets
-
- 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
- A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft
-
- 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
- A63B49/08—Frames with special construction of the handle
-
- 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
- A63B49/028—Means for achieving greater mobility of the string bed
Definitions
- FIG. 4A METAL TENNIS RACKET WITH PLASTIC THROAT PIECE AND MOLDED PLASTIC HANDLE Filed Aug. 28, 1969 5 Sheets-Sheet 5 FIG. 4A
- the metal racket is made from an extruded aluminum strip comprising a pair of opposed tubular sections connected by a web, with a strength factor of IY /A in the range of 0.0516Y to 0.058OY
- the metal strip has a first channel in its outer periphery and a second channel in its inner periphery.
- a plastic throat piece is provided with outer surfaces shaped complementarily to the configuration of the inner periphery of the metal strip.
- the racket further having a solid molded plastic handle made of a foamed plastic material molded to the lower extremities of the metal strip.
- This invention relates to metal tennis rackets.
- a final difliculty experienced in the prior art metal frame strip racket structures has been a lack of strength in the throat of the racket.
- rackets of known structure have been subject to deformation in torsion around the throat, which deformation has often resulted in the permanent deformation of the racket material thus misaligning the racket.
- the tennis racket of the invention may include a racket frame having a frame strip defining a stringing section and a handle section, a throat piece and a handle means, wherein the frame strip has a cross-sectional configuration with a strength factor in the range of .0516Y to .05sY,.
- Another aspect of the invention comprises a novel aluminum frame strip for manufacturing tennis rackets, which strip comprises first and second tubular portions separated by a web portion, and wherein the strip is configured in cross-section to provide a strength factor in the range of .0516Y to .05 SOY BRIEF DESCRIPTION OF THE DRAWINGS
- FIG. 1 is a perspective view of a tennis racket according to the invention
- FIG. 2 is a cross-sectional view through the plane 22 of FIG. 1;
- FIGS. 3A-D are a schematic presentation of the steps of manufacturing a tennis racket according to the method of the invention.
- FIGS. 4A and 4B disclose the throat piece.
- a tennis racket according to the invention is designated generally by the reference numeral 10.
- Racket includes a racket frame comprising a frame strip 12 which is bent to form a generally oval stringing section 14 and a handle section 16 defined by the opposed end sections 17, 18 of frame strip 12 extending from stringing section 14 in parallel spaced relationship.
- Throat piece 19 cooperates with oval string section 14 of frame strip 12 to define the generally oval impact area of the racket 10.
- Frame strip 12 comprises a monolithic strip having first and second outer tubular portions 21 and 22, which tubular portions are separated by a web section 23.
- Tubular portions 21 and 22, and web section 23 are cooperatively shaped on their one surface to define a generally rectangular channel 25, and on their their opposed surface to defined a generally trapezoidal channel 26.
- Rectangular channel 25 accommodates the positioning therein of a grommet strip 28 comprising a base strip of material having formed thereon a plurality of integral grommets 29.
- grommets 29 extend through holes 31 formed in the web section 23 of frame strip 12. It is to be recognized that although grommet strip 28 is shown as a single element, more than a single strip can be utilized equally as effectively.
- Throat piece 19 comprises a molded structure having outer curved surfaces which conform in curvature to the desired curve of frame strip 12 in the area of the racket throat so that when assembled, the throat piece 19 and the frame strip 12 are in surface-to-surface engagement.
- the outer surfaces of throat piece 19 are also shaped to conform to the cross-sectional configuration of channel 26 in frame strip 12 so that the surface-tosurface contact and therewith the structural integrity of the racket is enhanced.
- the inner surface 35 of throat piece 19 is provided with a plurality of raised portions 37 adjacent the surface openings of passages 44 as shown in FIG. 4B provided in throat piece 19 to accommodate the passage of racket strings therethrough.
- Raised portions 37 define fillets or curved support surfaces for the strings passing from the throat piece passages to the ball impact area of the racket. Such surfaces are provided to define string support surfaces of relatively large radii so that the problem of excessive string wear discussed 4 above will not be experienced at the passage openings of throat piece 19.
- Handle section 16 of racket 10 comprises the opposed end sections 17 and 18 of frame strip 12 which, because of the bending of the frame strip to define oval stringing section 14, extend in parallel spaced relationship.
- the lower extremities of end sections 17 and 18 are rigidly secured in parallel spaced relationship by being encased in a plastic material such as foamed polyurethane.
- the foamed polyurethane serves the dual function of rigidly securing frame strip end sections 17 and 18 and defining the desired octagonal shape around which a strip of handle material 38 may be wrapped to form a handle 39.
- the racket frame may be strung with suitable stringing material such as gut 41 as shown or other materials known to those skilled in the art.
- a frame strip 12 which has been extruded into the cross-sectional shape shown in FIG. 2 by conventional extrusion methods, is provided with a plurality of holes 31 by punching or similar operations.
- the frame strip 12 may be formed from an aluminum alloy and, in this regard, 6061-T6 aluminum alloy is the material of choice. Holes 31 are formed through web 23 and as such generate no internal sharp edges as has been experienced in holes through tubular shapes as discussed above.
- throat piece 19 is positioned in the throat of frame 12, snugly within channel 26, and secured to the frame strip by self tapping screws 41.
- the piece may be manufactured by molding into the desired shape using a material such as nylon.
- Other materials such as polypropylene and ABS (acrylonitrile-butadiene-styrene) may be used with satisfactory results.
- grommet strip 28 which may be a preformed strip manufactured from suitable material such as nylon, may be inserted in channel 25 of strip 12 in such a manner that grommets 29 extend through holes 31 (FIGS. 2 and 3C). With the grommet strip 28 so positioned, its ends are secured to frame strip 12 by securing with screws 42.
- Ends 17 and 18 of handle section 16- of the racket are then positioned within the die cavity 45 of a molding die 46 shown schematically in FIG. 3C, so that the lower extremity of the end sections 17 and 18 is spaced from the bottom of the cavity 45.
- the particular spacing is considered to be a matter of choice, however spacings of 0.5 to 0.75 inch have been found to be satisfactory.
- the inner surface of die cavity 45 is shaped to define the desired shape of handle 38 which in the racket 10 is octagonal.
- the securing of ends 17 and 18 by molding also accomplishes the formation of structure for handle 38.
- a charge of suitable foamable molding materail such as polyurethane foam is introduced into the die cavity and allowed to expand therein.
- suitable foamable molding materail such as polyurethane foam
- curing is permitted for a suitable period (e.g. twenty minutes) until the handle can be removed from the die 46 without experiencing deformation of the molding material.
- a further curing period e.g. twenty-four hours for allowing the molding material to take on a greater rigidity
- the handle may be wrapped (FIG. 3D) with a suitable handle strip material such as leather which is known to those skilled in the art.
- the racket may be strung.
- One mode of accomplishing this has been to soak the grommet strip material and throat piece material, when made of nylon, in a water bath to increase its water content.
- the racket may be finished for sale by the addition of suitable labels, a surface finish or other finishing touches which are both known by and within the skill of those in the art.
- racket strength factor is equal to I Y /A where I (infi) is the moment of inertia of the frame strip shape around its longitudinal axis, Y (#/in. is the yield stress of the material being used and A (in?) is the area of material exposed by a transverse cross-section of the strip shape, e.g. the area of strip material shown in FIG. 2.
- tennis rackets range in weight from approximately 12.5 ounces to 14.5 ounces, which range defines the light to heavy range generally accepted in the sport. If, in order to provide racket strength, it becomes necessary to utilize substantially the entire weight allowance over strings and handle weight for structural metal, the use of racket life extending devices such as grommets 29 becomes impossible and the racket must either become too heavy or inferior by reason of racket strength.
- the novel extrusion shape for frame strip 12 defines a shape of such high moment of inertia that less structural material is required and devices such as grommets 29 and in particular grommet strip 2 8, which materially simplifies manufacturing procedures, can be utilized.
- the moment of inertia defining shape of frame strip 12 thus becomes a critical shape in taking full advantage of the present invention and, in this regard, the criticality of the shape can best be defined by the racket strength factor which it renders possible.
- the frame strip 12 shown in cross- 5 section in FIG. 2 has enabled the achievement of strength factors in the range of from .0516Y, to .0580Y which factors have not heretofore been achievable in aluminum rackets.
- One example of a frame strip shape such as that shown in FIG. 2 which has provided a strength factor in the above-defined critical range is a strip manufactured from 6061-T 6 aluminum alloy with the following dimensions:
- This strip has been found to be unexpectedly strong, durable and, inter alia, because of the resulting capability to employ grommets therewith, has contributed to the extension of string life in rackets according to the invention by as much as 28 times the life of known rackets.
- the racket of the invention has been tested to demonstrate structural and string reliability when subjected to as many as 40,000 hits. In the same tests, known rackets have failed in the range of 1400 to 20,000 hits.
- the racket of the invention defines a substantial step forward in the art. Among other advantages it is capable of being conventionally strung, i.e. through frame holes, without the incidence of excessive string wear, it provides racket strength factors which are over 20% greater than known first quality aluminum rackets without exceeding the accepted range of total racket weight, it provides a racket which is stronger in torsion than known rackets, and it comprises a racket capable of being manufactured by a novel process which is less complicated and less expensive than any others known in the art.
- a metal racket comprising:
- an extruded metal frame strip comprising a pair of opposed tubular sections connected by a web, said frame strip being formed to partially define a generally oval section and being formed to provide a pair of spaced apart generally parallel handle end sections, and said tubular sections and said web defining a first channel in the outer periphery of said generally oval section and defining a second channel in the inner periphery of said generally oval section, and said web in said generally oval section having a plurality of holes formed therein for receiving string;
- plastic throat piece having outer surfaces formed complementary to said second channel, said plastic throat piece being received within said second channel and being secured to said formed frame strip in said second channel and completing in combination with said generally oval section of said formed strip an oval string section for said racket;
- grommet strip mounted in said first channel, said grommet strip having a plurality of grommets formed thereon and extending through said holes in said web;
- a molded plastic handle molded around said spaced apart generally parallel handle end sections, said molded plastic handle for securing said handle end sections in a fixed spaced apart generally parallel relationship and for defining a hand grip area for said racket.
- a racket according to claim 1 wherein said handle comprises a solid molded plastic handle made of a foamed plastic.
- IY /A racket strength factor
- IY /A racket strength factor
- a metal racket including an extruded metal frame strip having an inner surface of predetermined configuration and being shaped to partially define a generally oval section and also being shaped to provide a pair of spaced apart handle end sections; and a handle secured to said handle end sections; the improvement comprising:
- a plastic throat piece provided with outer surfaces shaped complementarily to said predetermined configuration of said inner surface of said frame strip
- said plastic throat piece secured to said shaped frame strip and completing in combination with said generally oval section of said shaped strip an oval stringing section for said racket;
- said plastic throat piece being flexible and thereby allowing torsional rotation of said metal frame strip in the throat area of said metal racket.
- a metal racket including a metal frame strip including a pair of spaced apart generally parallel end sections having lower extremities about which a handle is to be formed, the improvement comprising: a solid plastic handle secured to said lower extremities of said end sections and being continuously and homogeneously solid throughout, and for fixedly securing said lower extremities of said end sections in said spaced apart generally parallel relationship.
- a metal racket according to claim 13 wherein said molded plastic handle comprises a solid molded plastic handle made of a foamed plastic material.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Pulmonology (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
- Golf Clubs (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US85367669A | 1969-08-28 | 1969-08-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3702701A true US3702701A (en) | 1972-11-14 |
Family
ID=25316627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US853676A Expired - Lifetime US3702701A (en) | 1969-08-28 | 1969-08-28 | Metal tennis racket with plastic throat piece and molded plastic handle |
Country Status (8)
Country | Link |
---|---|
US (1) | US3702701A (ja) |
JP (2) | JPS506975B1 (ja) |
AT (1) | AT321165B (ja) |
CA (1) | CA940957A (ja) |
CH (1) | CH552990A (ja) |
DE (1) | DE2042803C3 (ja) |
FR (1) | FR2099015A1 (ja) |
GB (2) | GB1311925A (ja) |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3814423A (en) * | 1972-06-12 | 1974-06-04 | Reynolds Metals Co | Racquet construction and method of making same |
US3915453A (en) * | 1973-11-13 | 1975-10-28 | Daishiro Nishimura | Metallic racket with reinforcing apparatus |
US3947029A (en) * | 1974-05-31 | 1976-03-30 | N L Industries, Inc. | Low density cast racquet |
US3958805A (en) * | 1975-07-22 | 1976-05-25 | The Babcock & Wilcox Company | Racket yoke |
US4045025A (en) * | 1973-02-13 | 1977-08-30 | Starwin Industries, Inc. | Glass fiber tennis racket frame |
US4046377A (en) * | 1974-02-14 | 1977-09-06 | Regent Sports Corporation | Tennis racquet |
US4049269A (en) * | 1974-03-06 | 1977-09-20 | Robin Michael Blackburne | Rackets |
US4099718A (en) * | 1976-05-17 | 1978-07-11 | Marcraft Recreation Inc. | Racquet frame construction |
US4138109A (en) * | 1976-03-17 | 1979-02-06 | Nobbs John W | Racket and throat piece therefor |
US4147348A (en) * | 1975-12-17 | 1979-04-03 | Lee J Kelly | Tennis racket providing increased hitting power |
US4161813A (en) * | 1977-05-26 | 1979-07-24 | Acro, Inc. | Method of string attaching to game racket handle |
US4166616A (en) * | 1976-05-25 | 1979-09-04 | Nippon Gakki Seizo Kabushiki Kaisha | Tennis racket |
US4176841A (en) * | 1974-04-10 | 1979-12-04 | Reinhold Sommer | Tennis racket |
US4180264A (en) * | 1977-04-25 | 1979-12-25 | Acro, Inc. | Racket handle and method of making same |
US4182512A (en) * | 1975-12-03 | 1980-01-08 | Kuebler & Co. | Racket for playing tennis or similar ball games |
US4196901A (en) * | 1977-03-07 | 1980-04-08 | Durbin Enoch J | Tennis racquet |
US4204681A (en) * | 1978-07-13 | 1980-05-27 | Amf Incorporated | Game ball racket wherein certain racket components are structurally integrated with the racket frame by the string with which the racket is strung |
US4204680A (en) * | 1977-04-20 | 1980-05-27 | Blackburne Robin M | Rackets |
US4205844A (en) * | 1978-02-01 | 1980-06-03 | Gombas Laszlo A | Game racket |
US4209170A (en) * | 1978-03-13 | 1980-06-24 | Garver John P | Tennis racket |
US4247103A (en) * | 1979-04-04 | 1981-01-27 | Garver John P | Tennis racket |
US4247975A (en) * | 1977-05-26 | 1981-02-03 | Acro, Inc. | String attaching to game racket handle |
US4282642A (en) * | 1979-11-01 | 1981-08-11 | Rodgers Jr Robert E | Method of making composite racquet construction |
US4311308A (en) * | 1979-05-31 | 1982-01-19 | Franz Volkl Ohg | Tennis racket |
USRE31224E (en) * | 1976-10-15 | 1983-05-03 | Leach Industries, Inc. | Metal-plastic composite racquet |
US4614341A (en) * | 1984-07-19 | 1986-09-30 | David Fernandez | Tennis racket frame made of metal oxide fibers and ceramic particles |
US4844478A (en) * | 1988-05-24 | 1989-07-04 | Milton Kessler | Racket game for beach and kit therefor |
USRE33011E (en) * | 1984-07-19 | 1989-08-08 | Tennis racket frame made of metal oxide fibers and ceramic particles | |
AU588641B2 (en) * | 1985-10-11 | 1989-09-21 | Fin Sports Limited | Racquet shock absorbing device |
GB2218641A (en) * | 1988-05-16 | 1989-11-22 | Spalding & Evenflo | Tennis racket handle pallet |
GB2218642A (en) * | 1988-05-16 | 1989-11-22 | Spalding & Evenflo | Tennis racket |
US5029859A (en) * | 1989-04-10 | 1991-07-09 | Prince Manufacturing, Inc. | Protective bumper strip, especially for wide body tennis racquets |
US5269516A (en) * | 1991-12-30 | 1993-12-14 | Gencorp Inc. | Racquet handle |
WO1999052605A1 (en) | 1998-04-10 | 1999-10-21 | Ef Composite Technologies | Reinforced racquet with flat string bed |
US5993337A (en) * | 1998-05-08 | 1999-11-30 | Prince Sports Group, Inc. | Multi-hole grommet for sports racquets |
EP1790392A1 (en) * | 2005-11-29 | 2007-05-30 | Prince Sports, Inc. | Sport racqet with insert members for anchoring strings |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5065565U (ja) * | 1973-10-11 | 1975-06-13 | ||
US4119313A (en) * | 1975-07-12 | 1978-10-10 | Dunlop Limited | Games racquets |
FR2321911A1 (fr) * | 1975-08-14 | 1977-03-25 | Creuzet Yvon | Raquette de tennis a ossature metallique |
DE2812647C2 (de) * | 1978-03-22 | 1983-03-24 | Franz Völkl oHG, 8440 Straubing | Tennisschläger mit auslenkbarem Herz |
GB2116435A (en) * | 1982-03-05 | 1983-09-28 | Gray Nicolls Limited | Handles for sporting articles |
AT385901B (de) * | 1985-09-09 | 1988-06-10 | Head Sportgeraete Gmbh | Tennisschlaegerrahmen mit einem herzstueck |
GB2186804B (en) * | 1986-02-25 | 1989-11-08 | Nippon Musical Instruments Mfg | A racket |
AT388106B (de) * | 1987-05-05 | 1989-05-10 | Fischer Gmbh | Rahmen fuer ballschlaeger |
DE4018818C2 (de) * | 1990-06-12 | 1994-03-24 | J Dr Med Reinhardt | Schläger, insbesondere Tennis- oder Squashschläger |
US5082266A (en) * | 1990-08-30 | 1992-01-21 | Lo Kun Nan | Racket head with inner peripheral indentations |
CN2173093Y (zh) * | 1993-11-29 | 1994-08-03 | 赖东汉 | 一种形拍框之金属网球拍 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4827629B1 (ja) * | 1969-12-27 | 1973-08-24 |
-
1969
- 1969-08-28 US US853676A patent/US3702701A/en not_active Expired - Lifetime
-
1970
- 1970-08-21 GB GB4038270A patent/GB1311925A/en not_active Expired
- 1970-08-21 GB GB3689772A patent/GB1311926A/en not_active Expired
- 1970-08-26 CH CH1273670A patent/CH552990A/xx not_active IP Right Cessation
- 1970-08-27 AT AT779070A patent/AT321165B/de not_active IP Right Cessation
- 1970-08-27 FR FR7031391A patent/FR2099015A1/fr active Pending
- 1970-08-28 JP JP45074983A patent/JPS506975B1/ja active Pending
- 1970-08-28 DE DE2042803A patent/DE2042803C3/de not_active Expired
-
1972
- 1972-08-31 CA CA150,681A patent/CA940957A/en not_active Expired
-
1974
- 1974-10-18 JP JP49119492A patent/JPS5214652B1/ja active Pending
Cited By (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3814423A (en) * | 1972-06-12 | 1974-06-04 | Reynolds Metals Co | Racquet construction and method of making same |
US4045025A (en) * | 1973-02-13 | 1977-08-30 | Starwin Industries, Inc. | Glass fiber tennis racket frame |
US3915453A (en) * | 1973-11-13 | 1975-10-28 | Daishiro Nishimura | Metallic racket with reinforcing apparatus |
US4046377A (en) * | 1974-02-14 | 1977-09-06 | Regent Sports Corporation | Tennis racquet |
US4049269A (en) * | 1974-03-06 | 1977-09-20 | Robin Michael Blackburne | Rackets |
US4176841A (en) * | 1974-04-10 | 1979-12-04 | Reinhold Sommer | Tennis racket |
US3947029A (en) * | 1974-05-31 | 1976-03-30 | N L Industries, Inc. | Low density cast racquet |
US3958805A (en) * | 1975-07-22 | 1976-05-25 | The Babcock & Wilcox Company | Racket yoke |
US4182512A (en) * | 1975-12-03 | 1980-01-08 | Kuebler & Co. | Racket for playing tennis or similar ball games |
US4147348A (en) * | 1975-12-17 | 1979-04-03 | Lee J Kelly | Tennis racket providing increased hitting power |
US4138109A (en) * | 1976-03-17 | 1979-02-06 | Nobbs John W | Racket and throat piece therefor |
US4099718A (en) * | 1976-05-17 | 1978-07-11 | Marcraft Recreation Inc. | Racquet frame construction |
US4166616A (en) * | 1976-05-25 | 1979-09-04 | Nippon Gakki Seizo Kabushiki Kaisha | Tennis racket |
USRE31224E (en) * | 1976-10-15 | 1983-05-03 | Leach Industries, Inc. | Metal-plastic composite racquet |
US4196901A (en) * | 1977-03-07 | 1980-04-08 | Durbin Enoch J | Tennis racquet |
US4204680A (en) * | 1977-04-20 | 1980-05-27 | Blackburne Robin M | Rackets |
US4180264A (en) * | 1977-04-25 | 1979-12-25 | Acro, Inc. | Racket handle and method of making same |
US4161813A (en) * | 1977-05-26 | 1979-07-24 | Acro, Inc. | Method of string attaching to game racket handle |
US4247975A (en) * | 1977-05-26 | 1981-02-03 | Acro, Inc. | String attaching to game racket handle |
US4205844A (en) * | 1978-02-01 | 1980-06-03 | Gombas Laszlo A | Game racket |
US4209170A (en) * | 1978-03-13 | 1980-06-24 | Garver John P | Tennis racket |
US4204681A (en) * | 1978-07-13 | 1980-05-27 | Amf Incorporated | Game ball racket wherein certain racket components are structurally integrated with the racket frame by the string with which the racket is strung |
US4247103A (en) * | 1979-04-04 | 1981-01-27 | Garver John P | Tennis racket |
US4311308A (en) * | 1979-05-31 | 1982-01-19 | Franz Volkl Ohg | Tennis racket |
US4282642A (en) * | 1979-11-01 | 1981-08-11 | Rodgers Jr Robert E | Method of making composite racquet construction |
US4614341A (en) * | 1984-07-19 | 1986-09-30 | David Fernandez | Tennis racket frame made of metal oxide fibers and ceramic particles |
USRE33011E (en) * | 1984-07-19 | 1989-08-08 | Tennis racket frame made of metal oxide fibers and ceramic particles | |
AU588641B2 (en) * | 1985-10-11 | 1989-09-21 | Fin Sports Limited | Racquet shock absorbing device |
GB2218641A (en) * | 1988-05-16 | 1989-11-22 | Spalding & Evenflo | Tennis racket handle pallet |
GB2218642A (en) * | 1988-05-16 | 1989-11-22 | Spalding & Evenflo | Tennis racket |
GB2236487A (en) * | 1988-05-16 | 1991-04-10 | Spalding & Evenflo | Tennis racket |
US4844478A (en) * | 1988-05-24 | 1989-07-04 | Milton Kessler | Racket game for beach and kit therefor |
US5029859A (en) * | 1989-04-10 | 1991-07-09 | Prince Manufacturing, Inc. | Protective bumper strip, especially for wide body tennis racquets |
US5269516A (en) * | 1991-12-30 | 1993-12-14 | Gencorp Inc. | Racquet handle |
WO1999052605A1 (en) | 1998-04-10 | 1999-10-21 | Ef Composite Technologies | Reinforced racquet with flat string bed |
US6062994A (en) * | 1998-04-10 | 2000-05-16 | Ef Composite Technologies, L.P. | Reinforced racquet with flat string bed |
US5993337A (en) * | 1998-05-08 | 1999-11-30 | Prince Sports Group, Inc. | Multi-hole grommet for sports racquets |
EP1790392A1 (en) * | 2005-11-29 | 2007-05-30 | Prince Sports, Inc. | Sport racqet with insert members for anchoring strings |
JP2007144187A (ja) * | 2005-11-29 | 2007-06-14 | Prince Sports Inc | ストリングを固定するための挿入部材を有するスポーツラケット |
US20080058131A1 (en) * | 2005-11-29 | 2008-03-06 | Prince Sports, Inc | Sports racquet with insert members for anchoring strings |
US7396303B2 (en) | 2005-11-29 | 2008-07-08 | Prince Sports, Inc. | Sports racquet with insert members for anchoring strings |
CN1973924B (zh) * | 2005-11-29 | 2010-12-01 | 王子体育公司 | 具有用来锚定弦线的插入部件的运动球拍 |
AU2006210337B2 (en) * | 2005-11-29 | 2012-07-12 | Prince Sports Inc. | Sports racquet with insert members for anchoring strings |
Also Published As
Publication number | Publication date |
---|---|
JPS5214652B1 (ja) | 1977-04-23 |
DE2042803B2 (de) | 1977-08-04 |
JPS506975B1 (ja) | 1975-03-19 |
FR2099015A1 (ja) | 1972-03-10 |
GB1311925A (en) | 1973-03-28 |
AT321165B (de) | 1975-03-25 |
CH552990A (de) | 1974-08-30 |
GB1311926A (en) | 1973-03-28 |
CA940957A (en) | 1974-01-29 |
DE2042803A1 (de) | 1971-03-11 |
DE2042803C3 (de) | 1978-03-30 |
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JPH0429624Y2 (ja) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AMF HEAD INC.,COLORADO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMF INCORPORATED, A NJ. CORP.;REEL/FRAME:004688/0110 Effective date: 19870227 Owner name: AMF HEAD INC., 4801 NORTH 63RD ST., BOULDER, CO. 8 Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMF INCORPORATED, A NJ. CORP.;REEL/FRAME:004688/0110 Effective date: 19870227 |