US3921979A - Intermediate members for the crossing points of tennis racket stringings - Google Patents

Intermediate members for the crossing points of tennis racket stringings Download PDF

Info

Publication number
US3921979A
US3921979A US420520A US42052073A US3921979A US 3921979 A US3921979 A US 3921979A US 420520 A US420520 A US 420520A US 42052073 A US42052073 A US 42052073A US 3921979 A US3921979 A US 3921979A
Authority
US
United States
Prior art keywords
improvement
wings
synthetic material
strings
gutstrings
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
Application number
US420520A
Other languages
English (en)
Inventor
Gebhard Dischinger
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.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19722258872 external-priority patent/DE2258872C3/de
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3921979A publication Critical patent/US3921979A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/10—Reinforcements for stringing
    • A63B51/11—Intermediate members for the cross-points of the strings
    • 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
    • Y10S273/04—Ethylene

Definitions

  • FIG.1 A first figure.
  • Self Lubricating Moleriol e.g.Polyformoldehyde, Polyleirofluoroelhylene, Polypropylene,
  • Low Friction j Self-Lubricahng Material e.g. Polyformuldehyde, Polytetrafluoroethflene Polypropylene,
  • FIG.8 1 A first figure.
  • the present invention relates to intermediate members for the string cross points of tennis racket stringings, and with the intermediate members including recess on both sides thereof adapted to receive the mutually crossed strings.
  • the intermediate members are formed as crosspiece guides having crossing tubular or, respectively, grooveshaped portions, which at least partly encompass the strings by means of suitable wings, and which are constituted of a relatively lowfriction, self-lubricating plastic or synthetic material.
  • the inventive tennis racket stringing utilizes the collective advantages of the gutstrings, namely in particular, their outstanding elastic characteristics to the fullest extent, while concurrently preventing damage by a considerable reduction in the friction at the crossing points through the satisfactory guidance of the individual strings. From the foregoing there isachieved an outstanding elastic playing characteristic with a good traction capacity of the upper surface of the tennis racket stringing and thereby a better, and for the same load requirement. accelerated ball conveyance.
  • inventive intermediate members or crosspiece guides are, above all, particularly suited for tennis racket stringings employing gutstrings, they may also be advantageously employed in connection with plastic or synthetic material strings so as to improve either the elasticity and/or the contact properties of the stringing,.as well as playing characteristics of the tennis racket.
  • FIG. 1 illustrates a perspective, partly sectioned and enlarged fragmentary view of a typical tennis racket stringing showing the impact load thereon during impact by a tennis ball;
  • FIG. 2 is a schematic representation of sequential wear or chafing-through conditions of two crossed-over strings
  • FIG. 3 shows a perspective representation of a crossing point provided with a crosspiece guide formed in accordance with a first embodiment of the invention
  • FIG. 3a is a sectional view similar to FIG. 3 showing a crosspiece guide constructed according to a second embodiment
  • FIG. 4 is a sectional view similar to FIG. 3 showing a crosspiece guide constructed according to a third embodiment
  • FIG. 5 is a plan view of a portion of a tennis racket stringing having mounted thereon crosspiece guides constructed according to the embodiment of FIG. 3;
  • FIG. 6 is a sectional view taken along line VIVI in FIG. 5;
  • FIG. 7 is a side elevational view of a fourth embodiment of a crosspiece guide constructed according to the invention.
  • FIG. 7a is a bottom plan view of the crosspiece guide of FIG. 7;
  • FIG. 8 is a side elevational view similar to FIG. 7 of a slightly modified fifth embodiment of a crosspiece guide according to the invention.
  • FIG. 8a is a bottom plan view of the crosspiece guide of FIG. 8;
  • FIG. 9 is a plan view of a portion of a tennis racket stringing having mounted thereon crosspiece guides constructed according to the embodiment of FIGS. 7 and 7a;
  • FIG. 10 is a sectional view taken along line X-X in FIG. 9.
  • FIG. 1 illustrates in a fragmentary enlarged view, partly in section, a standard type of tennis racket stringing showing the deformation of the strings in the direction of arrow 10 upon impact by an oncoming tennis ball.
  • a standard type of tennis racket stringing showing the deformation of the strings in the direction of arrow 10 upon impact by an oncoming tennis ball.
  • the impact of the tennis ball 12 deforms the strings at the impact point approximately into the configuration schematically illustrated by string 16, in which the impulse of the tennis ball in the direction of the arrow 18 is transmitted to the strings, as is illustrated by the intermediate string 20.
  • each string which is positioned above at the crossing point is compressed against the there-below positioned string (in the illustrated example against the string 16). Consequently, the approximately point-shaped contact surface between two crossing-over strings is widened into a larger contact surface having, for example, a width x.
  • FIGS. 3, 3a and 4 illustrate crosspiece guides 28, which are introduced between two crossing-over strings 16 and 20.
  • this crosspiece guide comprises two perpendicularly extending tubularly or trough-shaped members 30, 32 which, by means of two symmetrical mirror-image shaped wings or side walls 34 and 36, encompass the strings l6 and 20 for about one-half their circumferences, and which then extend substantially parallel to each and tangential relative to the respective strings beyond the latter.
  • This construction forms essentially groove-like depressions, in which the strings 16, 20 extend in side wall-contact with the contact wings 34, 36.
  • This first embodiment is of particularly simple construction, and facilitates the rapid and uncomplicated insertion of the individual strings into the crosspiece guides. I
  • FIG. 3a of the drawin'g' ge'nerally corresponds with that of FIG. 3, howv er., in this modification the tubular-like portions 430,32 only extend so as to encompass the strings 16, 20
  • a crosspiece guide 28 of the type described is in itself adequate to obtain an adequate guide and securing of the various strings 16, 20 in the region of the cross over points.
  • the wings of the tubular-like members 30, 32 may be, according to any particular requirement, either shortened or lengthened.
  • FIG. 4 there is illustrated a third embodiment of a crosspiece guide 28 in which the tubular-like members 30, 32 almost entirely encompass the strings 16, 20.
  • the respective wing portions as in the other embodiments, are symmetrically mirror-image shaped relative to each other, and their free ends bend into proximity to each other at the upper surface of each of the strings 16, 20.
  • the wing portions of the tubularlike members 30, 32 are preferably elastically constructed so that the strings 16, 20, after bending open of the wings, are clampingly encompassed by the latter upon snapping shut of the wings.
  • FIGS. 3 and 4 are in particular also adapted to prevent any direct impact contact by the oncoming tennis balls, which provides for a considerable reduction in mechanical wear
  • the embodiment of FIG. 3a is particularly simple in construction and in material savings.
  • the various strings 16, 20 may be displaced relative to each other in an unhindered manner in response to any load or rotation imparted thereto.
  • FIG. 5 there is illustrated a portion of a tennis racket stringing in which there are positioned crosspiece guides 28 constructed according to FIG. 3 a tithe cross-over points of the crossing strings 14, 16.
  • FIG. 6 which shows a sectional view of the stringing of FIG. 5 taken along line VI-VI, there may be clearly ascertained the inter-weaving of the individual strings l4 and 16.
  • FIGS. 7 and 7a there is ascertained in, respectively, side and plan views, a fourth embodiment of crosspiece guide 37.
  • This crosspiece'guide structure includes relatively perpendicularly extending tubular-like members 38 and 40, which closely adhere to the string at the cross-over point and which are mutually reinforced through flanges 42.
  • the tubular-like members 38 and 40 are, in the longitudinal direction of the recesses or bores 44 which are adapted to receive the strings, provided with a slot 46, by means of which they may elastically be bent apart so as to facilitate insertion of the string into the recess 44. Subsequently, the tubularlike member snaps closed and thereby fixedly retains the string in that position.
  • FIGS. 7, 7a A fifth embodiment which largely corresponds with the fourth embodiment illustrated in FIGS. 7, 7a, i's ascertained from FIGS. 8 and 8a.
  • the crosspiece guide crossing elements 37a shown therein comprises, in lieu of the tubular-like members, two mutually perpendicularly extending ridge-like members 38a, 40a which, in a manner similar to that of the embodiment of FIG. 3, serve as guide grooves for the strings (not shown).
  • the outwardly projecting wings of the rigde-like members 38a and 40a may be formed as high as required, and
  • crosspiece guides 37a of this embodiment are somewhat simpler in construction than the crosspiece guides 37 of the fourth embodiment, since the ridge-like members 38a, 40a do not include ring-like closed and consequently elastically formed regions.
  • FIGS. 7, 7a A section of a tennis racket stringing having crosspiece guides 37a of the type shown in FIGS. 7, 7a may be ascertained from FIG. 9 of the drawings.
  • the tubular-like closed, and with suitable longitudinal slots provided portions 38, 40 encompass perpendicular to each other extending strings 14, 16, so as to guide and protect these in the regions of their cross-over points.
  • These slots 46 extend in longitudinal directions in conformance with the re spective strings 14, 16.
  • FIG. 9 there is shown a sectional view taken along line X-X in FIG. 9, and from which there may be ascertained the sinuous interweaving of the individual strings 14, 16. Further, therein is illustrated the manner in which the tubular-like members 38, 40 adhere against the strings.
  • the wings 34, 36 and/or the ridge-like members 380, 40a be profiled at the ends thereof for enhancing their gripping ability. Thereby, as indicated it becomes still simpler to impart a spin to the tennis ball during play and to improvedly guide the latter.
  • the low-friction, self-lubricating synthetic or plastic material for the crosspiece guides be constituted of polyformaldehyde or polytetrafluoroethylene (Teflon).
  • Teflon polyformaldehyde or polytetrafluoroethylene
  • the plastic material be constituted of a polypropylene or polyamide base with a molybdenum or graphite additive.
  • the elasticity of the novel gutstring stringing is considerably increased above the elasticity for prior art tennis racket stringings.
  • the player receives a considerably improved playing advantage due to the higher level of employment of the maximum elasticity characteristics of the gutstrings since, for example, by applying the same degree of force, the play is considerably accelerated.
  • the crosspiece guides in the regions of the crossover points provide a good support for the individual strings and a satisfactory guide while concurrently preventing friction which would tend to cause damage, and allow for the sliding-through movement of the individual strings so as to render possible the unhindered use of their elastic characteristics.
  • the crosspiece guides employed in the stringing allow for the use of thinner gutstrings, which additionally enhances the elasticity, and reduces the cost of the tennis racket stringing.
  • An intermediate crosspiece guide member formed of a low-friction self-lubricating synthetic material for use in a tennis racket stringing having crossing gutstrings, said member adapted to be mounted intermediate the gutstrings at the crossings thereof, said member comprising first and second recessed portions on opposite sides thereof, said recessed portions each including groove-forming pairs of upstanding wings adapted to extend along and engage at least part of the outer surface of gutstrings adapted to be received in said recessed portions, the groove-forming wings of said first recessed portion extending in a parallel spaced plane and transversely of the groove-forming wings of said second recessed portion adapted to prevent contact between adjacent gutstrings at the crossing thereof and to concurrently guide said gutstrings in coplanar and transverse directions.
  • said synthetic material being constituted of a polyamide base and a graphite additive.
  • each wing of said pair of upstanding wings being arcuately bent towards the other wing of said pair so as to form a substantially tubular configuration having a slot between the adjacent free ends of said wings.
  • each said pair of wings comprising symmetrical mirror-image shaped wings.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Lubricants (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Stringed Musical Instruments (AREA)
  • Laminated Bodies (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
US420520A 1972-12-01 1973-11-30 Intermediate members for the crossing points of tennis racket stringings Expired - Lifetime US3921979A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722258872 DE2258872C3 (de) 1972-12-01 Zwischenglieder für Tennisschlägerbespannungen

Publications (1)

Publication Number Publication Date
US3921979A true US3921979A (en) 1975-11-25

Family

ID=5863250

Family Applications (1)

Application Number Title Priority Date Filing Date
US420520A Expired - Lifetime US3921979A (en) 1972-12-01 1973-11-30 Intermediate members for the crossing points of tennis racket stringings

Country Status (15)

Country Link
US (1) US3921979A (de)
JP (1) JPS49135731A (de)
AT (1) AT332270B (de)
AU (1) AU474748B2 (de)
BE (1) BE807971A (de)
BR (1) BR7309484D0 (de)
CA (1) CA993467A (de)
CH (1) CH570176A5 (de)
ES (1) ES421043A1 (de)
FR (1) FR2208689B1 (de)
GB (1) GB1437505A (de)
IT (1) IT1002049B (de)
NL (1) NL7316483A (de)
SE (1) SE388782B (de)
ZA (1) ZA739134B (de)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078796A (en) * 1975-12-04 1978-03-14 Selcom-Camsa S.A.S. Di Carlo Gibello & C. Insert device for application to the intersections of tennis racket strings
US4095790A (en) * 1977-04-08 1978-06-20 Bronislaw Swiecicki Tennis racket with tensioned one-piece ball-striking friction imparting grid
US4168065A (en) * 1976-04-02 1979-09-18 Goransson Gunnar P M Racket
US4190249A (en) * 1976-07-31 1980-02-26 Werner Fischer Tennis racket and method of making same
US4249731A (en) * 1977-10-31 1981-02-10 Amster Harlan D Game racket
US4273331A (en) * 1976-12-10 1981-06-16 Werner Fischer Tennis-racket
US4368886A (en) * 1980-07-18 1983-01-18 Roland Graf Inserts for the crossing points of tennis racket stringing
US4377620A (en) * 1982-06-21 1983-03-22 Edward Alexander Gut for tennis racket and the like and method of making same
US4458898A (en) * 1982-04-19 1984-07-10 Boden Robert O Racquet with string positioning elements
US4589662A (en) * 1983-11-16 1986-05-20 Robaldo Aldo Michele Plug for damping vibrations of tennis racket cords
US4685676A (en) * 1986-01-30 1987-08-11 Boden Robert O Racquet structure
US4913430A (en) * 1988-01-20 1990-04-03 Leo Lichtenstein Tennis racket strings having orthogonally directed protrusions for enhancing the grip when in contact with a tennis ball
US5054779A (en) * 1987-12-03 1991-10-08 Hugo Marrello Tennis racquet
US5327714A (en) * 1992-07-30 1994-07-12 Prince Manufacturing, Inc. Synthetic string for sporting application
US5470066A (en) * 1993-07-15 1995-11-28 Soong; Tsai C. String fixer in sports racket
US6132325A (en) * 1997-06-25 2000-10-17 Bertolotti; Fabio P Interlocking string network for sport rackets
EP1078655A2 (de) 1999-08-25 2001-02-28 E.I. Du Pont De Nemours & Co. (Inc.) Reibungsverminderungselemente für Sportschlägersaiten
US6234922B1 (en) * 1998-07-06 2001-05-22 Craig C. White Fielding practice bat
US6280354B1 (en) 2000-03-27 2001-08-28 Fabio P Bertolotti Monolithic string network for sport rackets
US6506134B2 (en) 1997-06-25 2003-01-14 Fabio Paolo Bertolotti Interlocking string network for sports rackets
US20170282030A1 (en) * 2014-08-28 2017-10-05 Limpet Sports Management B.V. A bat for playing ball games
CN109276862A (zh) * 2018-12-07 2019-01-29 邬惠林 羽毛球十字拍线垫
CN110507968A (zh) * 2019-08-24 2019-11-29 邬惠林 防止拍线跑线走位的方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT352590B (de) * 1977-03-31 1979-09-25 Fischer Gmbh Einrichtung zur tilgung von schwingungen bei ballschlaegern
JPS5462458U (de) * 1977-10-11 1979-05-01
DE2922631C2 (de) * 1979-06-02 1985-12-05 Werner 8313 Vilsbiburg Fischer Saitenschutzteilchen für eine Tennisschlägerbespannung
DE2954073C2 (de) * 1979-06-02 1986-04-03 Werner 8313 Vilsbiburg Fischer Saitenschutzteilchen für eine Tennisschlägerbespannung
JPS5918633Y2 (ja) * 1979-07-30 1984-05-29 日本電気ホームエレクトロニクス株式会社 放電灯点灯装置
US4377288A (en) * 1981-04-13 1983-03-22 Sulprizio Michael S Tennis racket
JPS6131469U (ja) * 1984-07-31 1986-02-25 森商事株式会社 ラケツト用振動防止具
AU2913300A (en) * 1999-02-22 2000-09-14 Kirschbaum Sportartikel Gmbh Racket for ball games

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682199A (en) * 1928-08-28 Egbert h
US2542661A (en) * 1947-01-15 1951-02-20 Charles L Godfrey String anchoring fitment for tennis rackets
US3065567A (en) * 1959-02-27 1962-11-27 Jerome H Lemelson Inflatable toy
US3190032A (en) * 1958-10-17 1965-06-22 Green William Porter Hula hoop carrying vaned spinning part
US3232286A (en) * 1962-05-11 1966-02-01 Glen B Guyton Arrow rest
US3252241A (en) * 1963-05-17 1966-05-24 Gould Albert Pin wheel and propellor toys
US3375815A (en) * 1965-02-03 1968-04-02 Stanley J. Novak Bow with inflexible tubular nocking member
US3381959A (en) * 1965-02-16 1968-05-07 Le Fiell Mfg Company Billiard cue and method of manufacturing same
US3612545A (en) * 1968-06-10 1971-10-12 Duriron Co Restrainer ring seal assembly
US3769956A (en) * 1972-01-13 1973-11-06 M Simo Arrow rest for archery bow

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682199A (en) * 1928-08-28 Egbert h
US2542661A (en) * 1947-01-15 1951-02-20 Charles L Godfrey String anchoring fitment for tennis rackets
US3190032A (en) * 1958-10-17 1965-06-22 Green William Porter Hula hoop carrying vaned spinning part
US3065567A (en) * 1959-02-27 1962-11-27 Jerome H Lemelson Inflatable toy
US3232286A (en) * 1962-05-11 1966-02-01 Glen B Guyton Arrow rest
US3252241A (en) * 1963-05-17 1966-05-24 Gould Albert Pin wheel and propellor toys
US3375815A (en) * 1965-02-03 1968-04-02 Stanley J. Novak Bow with inflexible tubular nocking member
US3381959A (en) * 1965-02-16 1968-05-07 Le Fiell Mfg Company Billiard cue and method of manufacturing same
US3612545A (en) * 1968-06-10 1971-10-12 Duriron Co Restrainer ring seal assembly
US3769956A (en) * 1972-01-13 1973-11-06 M Simo Arrow rest for archery bow

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078796A (en) * 1975-12-04 1978-03-14 Selcom-Camsa S.A.S. Di Carlo Gibello & C. Insert device for application to the intersections of tennis racket strings
US4168065A (en) * 1976-04-02 1979-09-18 Goransson Gunnar P M Racket
US4190249A (en) * 1976-07-31 1980-02-26 Werner Fischer Tennis racket and method of making same
US4273331A (en) * 1976-12-10 1981-06-16 Werner Fischer Tennis-racket
US4095790A (en) * 1977-04-08 1978-06-20 Bronislaw Swiecicki Tennis racket with tensioned one-piece ball-striking friction imparting grid
US4249731A (en) * 1977-10-31 1981-02-10 Amster Harlan D Game racket
US4368886A (en) * 1980-07-18 1983-01-18 Roland Graf Inserts for the crossing points of tennis racket stringing
US4458898A (en) * 1982-04-19 1984-07-10 Boden Robert O Racquet with string positioning elements
US4377620A (en) * 1982-06-21 1983-03-22 Edward Alexander Gut for tennis racket and the like and method of making same
US4589662A (en) * 1983-11-16 1986-05-20 Robaldo Aldo Michele Plug for damping vibrations of tennis racket cords
US4685676A (en) * 1986-01-30 1987-08-11 Boden Robert O Racquet structure
US5054779A (en) * 1987-12-03 1991-10-08 Hugo Marrello Tennis racquet
US4913430A (en) * 1988-01-20 1990-04-03 Leo Lichtenstein Tennis racket strings having orthogonally directed protrusions for enhancing the grip when in contact with a tennis ball
US5327714A (en) * 1992-07-30 1994-07-12 Prince Manufacturing, Inc. Synthetic string for sporting application
US5470066A (en) * 1993-07-15 1995-11-28 Soong; Tsai C. String fixer in sports racket
US6132325A (en) * 1997-06-25 2000-10-17 Bertolotti; Fabio P Interlocking string network for sport rackets
US6506134B2 (en) 1997-06-25 2003-01-14 Fabio Paolo Bertolotti Interlocking string network for sports rackets
US6234922B1 (en) * 1998-07-06 2001-05-22 Craig C. White Fielding practice bat
US6386999B2 (en) * 1998-07-06 2002-05-14 Craig C. White Method of using a forming grid with a fielding practice bat
EP1078655A2 (de) 1999-08-25 2001-02-28 E.I. Du Pont De Nemours & Co. (Inc.) Reibungsverminderungselemente für Sportschlägersaiten
US6280354B1 (en) 2000-03-27 2001-08-28 Fabio P Bertolotti Monolithic string network for sport rackets
US20170282030A1 (en) * 2014-08-28 2017-10-05 Limpet Sports Management B.V. A bat for playing ball games
CN109276862A (zh) * 2018-12-07 2019-01-29 邬惠林 羽毛球十字拍线垫
CN110507968A (zh) * 2019-08-24 2019-11-29 邬惠林 防止拍线跑线走位的方法

Also Published As

Publication number Publication date
CA993467A (en) 1976-07-20
ZA739134B (en) 1974-10-30
IT1002049B (it) 1976-05-20
ATA991473A (de) 1975-12-15
AU474748B2 (en) 1976-07-29
DE2258872A1 (de) 1974-06-20
FR2208689A1 (de) 1974-06-28
NL7316483A (de) 1974-06-05
BR7309484D0 (pt) 1974-09-05
GB1437505A (en) 1976-05-26
CH570176A5 (de) 1975-12-15
ES421043A1 (es) 1976-05-01
BE807971A (fr) 1974-03-15
SE388782B (sv) 1976-10-18
AT332270B (de) 1976-09-27
DE2258872B2 (de) 1976-09-30
AU6306673A (en) 1975-06-05
JPS49135731A (de) 1974-12-27
FR2208689B1 (de) 1978-02-24

Similar Documents

Publication Publication Date Title
US3921979A (en) Intermediate members for the crossing points of tennis racket stringings
US3884467A (en) Device for hitting a ball, shuttlecock or the like
US3889950A (en) Flexible geodesic-type toys
US6506134B2 (en) Interlocking string network for sports rackets
US4249731A (en) Game racket
JPS59501099A (ja) テニスまたはスカツシユラケツト
US4190249A (en) Tennis racket and method of making same
KR910009207B1 (ko) 테니스라켓
US3926431A (en) Racket
US5150896A (en) Game racket with incurvate contact surfaces
CA1239160A (en) Racquet for playing a ball game
JP2002537004A (ja) フレーム側で窪んだラケットストリング案内
US4253269A (en) Reversible flexible aerodynamic disc
US4377288A (en) Tennis racket
US5536005A (en) Means for racket to return strings to original position after ball impact
US5562283A (en) Sports racquet having power ring
US3513588A (en) Toy assembly kit
US5005834A (en) Multi-frame racket
US4913430A (en) Tennis racket strings having orthogonally directed protrusions for enhancing the grip when in contact with a tennis ball
US4597576A (en) Sports racquet utilizing non-circular strings
US4565061A (en) String for rackets
US5158288A (en) Tennis racket frame with multiple cross-sectional shapes
US4903967A (en) Racket frame having holes for tailoring frame stiffness
US5568923A (en) Roller hockey puck
BE903697A (nl) Snaarsportracket met een snaarspanning overbrengende inrichting.