US3752478A - Racket frame - Google Patents
Racket frame Download PDFInfo
- Publication number
- US3752478A US3752478A US00128232A US3752478DA US3752478A US 3752478 A US3752478 A US 3752478A US 00128232 A US00128232 A US 00128232A US 3752478D A US3752478D A US 3752478DA US 3752478 A US3752478 A US 3752478A
- Authority
- US
- United States
- Prior art keywords
- unit
- ribs
- edge sections
- section
- webs
- 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
Links
Images
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
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
Definitions
- the present invention overcomes these difficulties by providing an extruded aluminum frame unit which has a novel cross-section resulting in a frame which is lighter in weight while having the required strength to prevent damage to the frame in use, and also one which can be more readily bent and accurately drilled to provide the stringing holes therein.
- an extruded unit having tubular edge portions connected by spaced inner and outer webs, which webs are connected by a pair of longitudinal ribs disposed on opposite sides of the longitudinal axis of the unit, thus forming a central, substantially rigid thin-walled box section connecting the tubular edge portions.
- the extrusion is made as a flat strip and is thereafter bent to provide a stringr eceiving bow section and an integral handle-receiving section.
- the outer web is recessed in the unit to provide a string-protecting channel around the bow and the string-receiving holes are drilled in the webs while the unit is in flat condition.
- the accuracy of the drilling operation is enhanced, according to the present invention, by providing the opposite faces of the longitudinal ribs with drill centering and guiding surfaces which accurately control the drill as it forms the stringing holes.
- a further advantage of the tri-hollow unit of the present invention resides in the fact that the wall thickness of the curved edge portions of the tubular edges can be made thicker than heretofore, while the walls of the webs and ribs can be made thinner.
- FIG. 1 shows a plan view of a tennis racket having a frame of the present invention.
- FIG. 2 is a sectional view through the extruded frame taken along lines 2-2 of FIG. 1.
- FIG. 3 is a view similar to FIG. 2 taken through the bow section of the racket showing a stringing hole formed therein.
- FIG. 4 is a section of the prior art racket (Type A).
- the tennis racket of the present invention comprises a frame formed by a unit extruded as an elongate strip and bent to have a bow section 11 shaped to receive theus usual strings l2 and continuations 11a of the frame extending down to receive a hand grip 13 to form the handle section for the racket.
- the unit 10 is formed as a flat strip of exturded aluminum or an alloy thereof having a cross-section, such as shown in FIG. 2, which has tubular edge sections 14, 15 integrally joined together by spaced inner and outer web sections l6, 17.
- the two web sections 16, 17 are joined by spaced longitudinal ribs 18, 19 integral therewith and disposed on opposite sides of the longitudinal axis of the extruded unit.
- the racket thus formed provides a tri-ho'llow frame unit having tubular edge sections 20, 21 connected by a substantially rigid hollow box section 22.
- the outer web 17 can be recessed in the unit to provide a straight-walled protecting channel -C for the strings.
- the unit has a plurality of string-receiving holes 23 drilled in the webs in the bow section while the unit is in flat form. Thereafter the unit is bent to provide the required shape of the bow, as shown in FIG. 1, with the throat sections of the bow connected to a yoke 24- by rivets 25. The extending ends of the unit are in parallel relation, as shown in FIG. 1, and are connected to the suitable hand grip structure 13. i
- a feature of the invention resides in the fact that the unit, when extruded with the cross-section as shown in FIG. 2, is substantially lighter in weight than the extruded units heretofore used having a solid web connecting the tubular edge portions. Specifically, theunit was reduced in weight from 10.6 oz. minimum for prior units to a weight of about 9.7 oz. for the present construction.
- the walls forming the curved surfaces 26 of the sections of the tubular edge portions to be reinforced and be thicker than the webs and the longitudinal ribs, as is clear from FIG. 2.
- the thickness of the walls of the curve can be a minimum of 0.048 inch while the thickness of the webs and ribs are a minimum of 0.033 inch.
- the ribs 18, 19 connecting the two webs are shaped as shown in FIG. 2 with the opposed surfaces 30, 31 converging and forming centering and guiding surfaces for the drill (not shown) which provides the string-receiving holes in the bow. It will be seen from FIG. 3 that these surfaces will contact and guide the sides of the drill as it drills the holes 23, thus controlling the drill and preventing shifting of the drill and more accurate guiding and drilling of the holes. If desired, the edges of the holes are chamfered at 33 to prevent damage to the string.
- the tri-hollow frame of the present racket is not only lighter in weight than heretofore used, but that it is strengthened and will stand up under the stress of play as tested on a whacking machine (not shown) in which the rackets are mounted on two opposing arms rotated about a common axis by a motor at a rotational speed of 240 rpm with the distance of impact from the point of axis of rotation at 44 inches.
- the velocity at impact is 92 feet per second and the rackets are subjected to approximately 1,350 impacts per hour for a period of approximately 2% hours.
- the maximum permissible set is six thirty-seconds inch under this test. It had been found that rackets of the present invention when subjected to this test showed no damage.
- Type A Type B Permanent Permanent Test Set (Net) Set (Net) No. Test Time RH LH RH LH (inches) (inches) (inches) (inches) 1. 30 min. 8/32 9/32 3/32 2/32 2/32 2. 30 min. 7/32 6/32 0 3. 30 min. 7/32 /32 0 2/32 4. 45 min. 5/32 6/32 0 0 5. 2% hrs. 5/32 H32 1/32 Permanent Test Frame Weight Set (Net) No. in Oz.
- the tri-hollow unit of the present invention solves a long standing problem in the art of extruded metal frame rackets in that it permits the weight of the frame to be reduced so that playable frames of varying weights can be made and at the same time have the required strength to withstand the strains in use so as to provide an acceptable aluminum tennis racket.
- a game racket frame including a string receiving bow section and an integral handle receiving section, said frame comprising a hollow elongated seamless extruded unit, said unit having a cross section comprising tubular edge sections,
- each of said ribs being connected between said inner and outer webs, said longitudinal ribs being disposed on opposite sides of the longitudinal axis of said extruded unit so as to form a central hollow box and two hollow edge sections within said extruded unit;
- the inner surface ofeach of said ribs having a geometrical. configuration such that said inner surfaces converge toward each other so as to provide guiding and centering surfaces adapted to guide a drill for drilling string openings through said webs between said ribs.
- a game racket frame including a string receiving bow section and an integral handle receiving section, said frame comprising a hollow elongated seamless extruded unit, said unit having a cross section comprising tubular edge sections,
- each of said ribs being connected between said inner and outer webs, said longitudinal ribs being disposed on opposite sides of the longitudinal axis of said extruded unit so as to form a central hollow box and two hollow edge sections within said extruded unit;
- the portions of the unit forming an outer wall of the tubular edge sections being thicker than the webs and the longitudinal ribs.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Fishing Rods (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12823271A | 1971-03-26 | 1971-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3752478A true US3752478A (en) | 1973-08-14 |
Family
ID=22434296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00128232A Expired - Lifetime US3752478A (en) | 1971-03-26 | 1971-03-26 | Racket frame |
Country Status (4)
Country | Link |
---|---|
US (1) | US3752478A (en) |
JP (1) | JPS48101226A (en) |
AU (1) | AU460236B2 (en) |
CA (1) | CA938628A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3908995A (en) * | 1972-06-21 | 1975-09-30 | True Temper Corp | Yoke for game racket |
US4165071A (en) * | 1976-01-05 | 1979-08-21 | Frolow Jack L | Tennis racket |
DE2819174A1 (en) * | 1978-05-02 | 1979-11-08 | Ulrich Hofmann | Racquet with air and perspiration ducts - has hollow handle and shaft, with cavities in hollow tubular piece |
DE2908872A1 (en) * | 1978-03-07 | 1980-01-31 | Dunlop Ltd | PLAY RACKET AND METHOD FOR THE PRODUCTION THEREOF |
WO1980002510A1 (en) * | 1979-05-17 | 1980-11-27 | J Frolow | Tennis racket |
US4291574A (en) * | 1976-01-05 | 1981-09-29 | Frolow Jack L | Tennis racket |
US4367874A (en) * | 1979-01-04 | 1983-01-11 | Starwin Industries, Inc. | Tennis racquet and method of making same |
USRE31419E (en) * | 1976-01-05 | 1983-10-18 | Tennis racket | |
DE3609453A1 (en) * | 1986-03-20 | 1987-10-01 | Erbsloeh Julius & August | Tennis racket |
US5184818A (en) * | 1991-11-14 | 1993-02-09 | Lo Kun Nan | Metal racket |
DE9416119U1 (en) * | 1993-11-29 | 1995-02-16 | Lu Lai, Ling-Ling, Taichung, Shi-Tung | Racket construction |
US5642881A (en) * | 1996-02-02 | 1997-07-01 | Lisco, Inc. | Tri-hollow racket with traverse ribs |
US20050266940A1 (en) * | 2004-05-27 | 2005-12-01 | Ef Composite Technologies, L.P. | Composite racquet with double tube head frame |
EP2609970A1 (en) * | 2011-12-28 | 2013-07-03 | Dunlop Sports Co., Ltd. | Racket frame |
CN105031894A (en) * | 2015-09-02 | 2015-11-11 | 陈正盛 | Racket and manufacturing method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6171166U (en) * | 1984-10-17 | 1986-05-15 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1588140A (en) * | 1923-02-16 | 1926-06-08 | Spalding & Bros Ag | Reenforced game frame |
US1937787A (en) * | 1928-06-13 | 1933-12-05 | Roy H Robinson | Tennis or squash racket |
US2668682A (en) * | 1949-08-22 | 1954-02-09 | Houston Fearless Corp | Folding tripod construction |
US2742289A (en) * | 1953-12-09 | 1956-04-17 | George A Allward | Game racket construction |
US3540728A (en) * | 1967-11-08 | 1970-11-17 | George R Palmer | Racket with metal frame welded to handle sleeve |
US3625512A (en) * | 1968-01-26 | 1971-12-07 | Peter A Latham | Extruded racket having two seamless hollow tubes formed with an interconnecting web |
-
1971
- 1971-03-26 US US00128232A patent/US3752478A/en not_active Expired - Lifetime
-
1972
- 1972-03-23 CA CA137945A patent/CA938628A/en not_active Expired
- 1972-03-23 JP JP47028602A patent/JPS48101226A/ja active Pending
- 1972-03-24 AU AU40385/72A patent/AU460236B2/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1588140A (en) * | 1923-02-16 | 1926-06-08 | Spalding & Bros Ag | Reenforced game frame |
US1937787A (en) * | 1928-06-13 | 1933-12-05 | Roy H Robinson | Tennis or squash racket |
US2668682A (en) * | 1949-08-22 | 1954-02-09 | Houston Fearless Corp | Folding tripod construction |
US2742289A (en) * | 1953-12-09 | 1956-04-17 | George A Allward | Game racket construction |
US3540728A (en) * | 1967-11-08 | 1970-11-17 | George R Palmer | Racket with metal frame welded to handle sleeve |
US3625512A (en) * | 1968-01-26 | 1971-12-07 | Peter A Latham | Extruded racket having two seamless hollow tubes formed with an interconnecting web |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3908995A (en) * | 1972-06-21 | 1975-09-30 | True Temper Corp | Yoke for game racket |
US4165071A (en) * | 1976-01-05 | 1979-08-21 | Frolow Jack L | Tennis racket |
US4291574A (en) * | 1976-01-05 | 1981-09-29 | Frolow Jack L | Tennis racket |
USRE31419E (en) * | 1976-01-05 | 1983-10-18 | Tennis racket | |
DE2908872A1 (en) * | 1978-03-07 | 1980-01-31 | Dunlop Ltd | PLAY RACKET AND METHOD FOR THE PRODUCTION THEREOF |
US4297308A (en) * | 1978-03-07 | 1981-10-27 | Dunlop Limited | Method of manufacturing games rackets |
US4440392A (en) * | 1978-03-07 | 1984-04-03 | Dunlop Limited | One piece molded games racket |
DE2819174A1 (en) * | 1978-05-02 | 1979-11-08 | Ulrich Hofmann | Racquet with air and perspiration ducts - has hollow handle and shaft, with cavities in hollow tubular piece |
US4367874A (en) * | 1979-01-04 | 1983-01-11 | Starwin Industries, Inc. | Tennis racquet and method of making same |
WO1980002510A1 (en) * | 1979-05-17 | 1980-11-27 | J Frolow | Tennis racket |
DE3609453A1 (en) * | 1986-03-20 | 1987-10-01 | Erbsloeh Julius & August | Tennis racket |
US5184818A (en) * | 1991-11-14 | 1993-02-09 | Lo Kun Nan | Metal racket |
FR2684884A1 (en) * | 1991-11-14 | 1993-06-18 | Lo Kun Nan | Metallic racket |
DE9416119U1 (en) * | 1993-11-29 | 1995-02-16 | Lu Lai, Ling-Ling, Taichung, Shi-Tung | Racket construction |
US5460370A (en) * | 1993-11-29 | 1995-10-24 | Tung-Han; Lai | Structure of racket |
US5642881A (en) * | 1996-02-02 | 1997-07-01 | Lisco, Inc. | Tri-hollow racket with traverse ribs |
US20050266940A1 (en) * | 2004-05-27 | 2005-12-01 | Ef Composite Technologies, L.P. | Composite racquet with double tube head frame |
US7077768B2 (en) | 2004-05-27 | 2006-07-18 | Ef Composite Technologies, L.P. | Composite racquet with double tube head frame |
US20060223659A1 (en) * | 2004-05-27 | 2006-10-05 | Ef Composite Technologies L.P. | Composite racquet with double tube head frame |
EP2609970A1 (en) * | 2011-12-28 | 2013-07-03 | Dunlop Sports Co., Ltd. | Racket frame |
US8651985B2 (en) | 2011-12-28 | 2014-02-18 | Dunlop Sports Co. Ltd. | Racket frame |
CN105031894A (en) * | 2015-09-02 | 2015-11-11 | 陈正盛 | Racket and manufacturing method thereof |
CN105031894B (en) * | 2015-09-02 | 2018-06-19 | 陈正盛 | A kind of racket and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
AU460236B2 (en) | 1975-03-21 |
CA938628A (en) | 1973-12-18 |
JPS48101226A (en) | 1973-12-20 |
AU4038572A (en) | 1973-09-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |
|
AS | Assignment |
Owner name: SPALDING CORPORATION Free format text: MERGER;ASSIGNOR:QUESTOR CORPORATION;REEL/FRAME:004309/0474 Effective date: 19831228 |
|
AS | Assignment |
Owner name: Q HOLDINGS CORP. Free format text: MERGER;ASSIGNOR:SPALDING CORPORATION;REEL/FRAME:004330/0768 Effective date: 19840910 Owner name: Q HOLDINGS CORP., FLORIDA Free format text: MERGER;ASSIGNOR:SPALDING CORPORATION;REEL/FRAME:004330/0768 Effective date: 19840910 |
|
AS | Assignment |
Owner name: SPALDING & EVENFLO COMPANIES, INC Free format text: ASSIGNS THE ENTIRE INTEREST AS OF SEPTEMBER 12,1984;ASSIGNOR:Q HOLDINGS CORP.;REEL/FRAME:004334/0562 Effective date: 19840912 |
|
AS | Assignment |
Owner name: LUFKIN DAN W. AGENT Free format text: SECURITY INTEREST;ASSIGNOR:SPALDING & EVENFLO COMPANIES, INC., A DE CORP.;REEL/FRAME:004343/0948 Effective date: 19840912 Owner name: Q HOLDINGS CORP., A DE CORP. NOTEHOLDER Free format text: SECURITY INTEREST;ASSIGNOR:SPALDING & EVENFLO COMPANIES, INC., A DE CORP.;REEL/FRAME:004343/0948 Effective date: 19840912 Owner name: CITICORP INDUSTRIAL CREDIT,IN. A DEL CORP. Free format text: SECURITY INTEREST;ASSIGNOR:SPALDING & EVENFLO COMPANIES,INC. A CORP . OF DEL;REEL/FRAME:004358/0361 Effective date: 19840912 Owner name: CITICORP INDUSTRIAL CREDIT,ILLINOIS Free format text: SECURITY INTEREST;ASSIGNOR:SPALDING & EVENFLO COMPANIES, INC.;REEL/FRAME:004358/0361 Effective date: 19840912 Owner name: Q HOLDINGS CORP., NOTEHOLDER, FLORIDA Free format text: SECURITY INTEREST;ASSIGNOR:SPALDING & EVENFLO COMPANIES, INC.;REEL/FRAME:004343/0948 Effective date: 19840912 Owner name: LUFKIN, DAN W., AGENT, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:SPALDING & EVENFLO COMPANIES, INC.;REEL/FRAME:004343/0948 Effective date: 19840912 |
|
AS | Assignment |
Owner name: Q HOLDINGS CORP., FLORIDA Free format text: MERGER;ASSIGNOR:SPALDING CORPORATION;REEL/FRAME:004542/0414 Effective date: 19840910 Owner name: Q HOLDINGS CORP. A CORP. OF DE. Free format text: MERGER;ASSIGNOR:SPALDING CORPORATION;REEL/FRAME:004542/0414 Effective date: 19840910 |
|
AS | Assignment |
Owner name: Q HOLDINGS CORPORATION, FLORIDA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:LUFKIN, DAN W., AS AGENT;REEL/FRAME:005000/0804 Effective date: 19880929 Owner name: SPALDING & EVENFLO COMPANIES, INC., FLORIDA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:LUFKIN, DAN W., AS AGENT;REEL/FRAME:005000/0804 Effective date: 19880929 Owner name: Q HOLDINGS CORPORATION, A DE CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:LUFKIN, DAN W., AS AGENT;REEL/FRAME:005000/0804 Effective date: 19880929 Owner name: SPALDING & EVENFLO COMPANIES, INC., A DE CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:LUFKIN, DAN W., AS AGENT;REEL/FRAME:005000/0804 Effective date: 19880929 |