EP0407631A1 - Méthode pour la mesure de la qualité de raquettes de sport et dispositif - Google Patents

Méthode pour la mesure de la qualité de raquettes de sport et dispositif Download PDF

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Publication number
EP0407631A1
EP0407631A1 EP89112628A EP89112628A EP0407631A1 EP 0407631 A1 EP0407631 A1 EP 0407631A1 EP 89112628 A EP89112628 A EP 89112628A EP 89112628 A EP89112628 A EP 89112628A EP 0407631 A1 EP0407631 A1 EP 0407631A1
Authority
EP
European Patent Office
Prior art keywords
handle
force
head
deflection
racket
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.)
Withdrawn
Application number
EP89112628A
Other languages
German (de)
English (en)
Inventor
Hans Zinner
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.)
Tegro Gross- und Einzelhandel fur Tennisartikel GmbH
Original Assignee
Tegro Gross- und Einzelhandel fur Tennisartikel GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tegro Gross- und Einzelhandel fur Tennisartikel GmbH filed Critical Tegro Gross- und Einzelhandel fur Tennisartikel GmbH
Publication of EP0407631A1 publication Critical patent/EP0407631A1/fr
Withdrawn legal-status Critical Current

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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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/42—Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand

Definitions

  • the invention relates to a method for measuring the quality of sports racquets with a handle and an associated head delimited by a frame, such as e.g. Tennis and squash rackets, and a device for performing this method.
  • RA value is determined by the following method: the racket is placed in the area of its racket heart on a web running perpendicular to its longitudinal axis, in the area of the handle from the opposite side, i.e. from supported above and at the same time, also from above, to the club head forming the frame at the point opposite the handle with a certain, previously adjustable force and the resulting deflection is measured downwards.
  • the invention has set itself the task of creating a method by means of which the quality of sports rackets can be measured.
  • the racket loaded by the impacting and reflected ball does not experience any deflections and deflections, so that the impacting ball is released in accordance with the laws of reflection.
  • the club head is moved out of its rest position by the not inconsiderable forces, which results in deviations of the hit ball up to a few meters from the desired point of impact. The player loses control of the ball.
  • the entire deflection of the racket consists of three components.
  • One component is the deflection of the racket in the direction of the impacting ball, which means a rotation about an axis running in the plane of the head.
  • Another movement occurs when the ball is outside the center line determined by the handle, so that the club head and the club undergoes a torsion about the longitudinal axis, which then represents the axis of rotation.
  • the third remaining option occurs when the racket is subjected to tangential loads, as occurs in a special way when the balls are cut to produce a twist. The racket then undergoes deformation about an axis perpendicular to the head.
  • the measurement method according to the invention includes the determination of a triplet of measured values that fully describes the properties of the sports racket, although in principle the acquisition of a single value is also possible.
  • the procedure is as follows: For all measurements, the racket is only fixed with the handle. In order to detect the deflection about the axis running perpendicular to the longitudinal axis in the plane of the head, a force is exerted on the frame at the position of the head opposite the handle and the deflection caused thereby is detected as a function of the respective force. To measure the torsion around the longitudinal axis, the force is applied with the handle fixed approximately in the middle of the head, i.e. at its maximum diameter measured perpendicular to the longitudinal axis and perpendicular to the plane of tension, and here too the deflection is determined as a function of the force. Force relationships are obtained, as are the case with off-axis balls.
  • the third measurement is made by one Axis running perpendicular to the covering plane.
  • the frame is loaded approximately in the middle of the head, that is also at maximum diameter, perpendicular to the longitudinal axis, now in the direction of the surface defined by the head.
  • Such force components occur especially when balls with a twist are to be generated, that is to say so-called slice and topspin balls.
  • the quality of the racket measured in each case is more favorable the lower the respective deflections are. It is basically irrelevant for the measurement whether it is carried out with or without the head covered.
  • the buyer then has to select the racket that is optimal for him from the entire range based on the measured values determined in an exact and physical way. If there is little need to play slice or topspin balls, he will attach less importance to the latter measurement and concentrate primarily on the first two.
  • the decisive advantage of the method according to the invention is that for the first time the realistic gaming behavior is reproduced on the basis of objectively precisely determined measured values.
  • the deflection is to be recorded as a function of the force applied, it being important to ensure that the elastic limits of the racket are not exceeded and that no permanent deformations, deformations or other res inelastic behavior occur.
  • the following devices which consists of a fastening device for fixing the handle and a plunger which applies force to the frame and thereby experiences a displacement in accordance with the deflection.
  • a fastening device for fixing the handle
  • a plunger which applies force to the frame and thereby experiences a displacement in accordance with the deflection.
  • the force exerted by the plunger is limited and the deflection that occurs when it is reached is measured by a measuring device.
  • the concrete constructional realization can take place in that the force limiter is a ratchet which simply "slips" when the set and usually also changeable value is reached and does not allow any further power transmission. The rash present at this moment must be recorded. Strain gauges which are known per se and which generate electrical measured values as a function of the deflection can be used to measure them.
  • Another form of implementation of the device according to the invention has a stop limiter and a measuring device which serves to detect the force exerted when the maximum deflection is reached.
  • the fastening device serving to fix the handle spatially adjustable in order to release the handle after each measurement when determining the measurement value triple and then to fix it again in another fastening device in which the club head is then in relation to the plunger takes the desired position.
  • the handle only has to be fixed once when determining the triplet of measured values and can be moved in three desired positions relative to the plunger by appropriate spatial adjustment.
  • the sports racket (1) shown has a handle (2) in a manner known per se, a shaft (3) adjoining it in the axial direction and serving as a connection to the head, and the head (5) delimited by the frame (4), through which the covering perpendicular to the plane of the drawing is absorbed.
  • the handle (2) is spatially fixed via a fastening device (6).
  • the frame (4) is loaded in the directions indicated by the arrows (7) and (8), the point of application of the force indicated by the arrow (7) lying opposite the handle (2) and thus on the longitudinal axis defined by it.
  • the racket (1) then experiences a movement about an axis running perpendicular to the plane of the drawing.
  • the point indicated by the arrow (8) lies approximately in the middle of the head between the point indicated by the arrow (7) and the shaft (3) extending outwards.
  • the racket When loaded in the direction of arrow (8), the racket is twisted about its longitudinal axis defined by the handle (2).
  • FIG. 2 The structure of the racket shown there is identical to that shown in FIG. 1.
  • positions identified by positions (7) and (8) represent the points of application of the force effects shown by the arrows (7) and (8) in FIG. 1.
  • the point of application of the force acting perpendicular to the plane of the drawing which was designated by the arrow (9) in FIG. 2, is provided with the reference symbol (9) in FIG. 1.
  • the direction of action of the forces indicated by arrows in the one figure and the point of application of the respective force in the other figure are identified by the same reference number.
  • the swing of the racket (1) takes place in the direction indicated by the respective arrows (7), (8), (9) and serves as a measure of the quality of the racket.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Golf Clubs (AREA)
EP89112628A 1988-07-04 1989-07-11 Méthode pour la mesure de la qualité de raquettes de sport et dispositif Withdrawn EP0407631A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3822521A DE3822521A1 (de) 1988-07-04 1988-07-04 Verfahren zur messung der qualitaet von sportschlaegern sowie vorrichtung

Publications (1)

Publication Number Publication Date
EP0407631A1 true EP0407631A1 (fr) 1991-01-16

Family

ID=6357881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89112628A Withdrawn EP0407631A1 (fr) 1988-07-04 1989-07-11 Méthode pour la mesure de la qualité de raquettes de sport et dispositif

Country Status (2)

Country Link
EP (1) EP0407631A1 (fr)
DE (1) DE3822521A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003074137A1 (fr) 2002-03-07 2003-09-12 Radder, Arjen, Martijn Procede de mesure de parametres et de dispositif de frappe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102657932A (zh) * 2012-05-24 2012-09-12 西南石油大学 网球拍响应在线检测器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291574A (en) * 1976-01-05 1981-09-29 Frolow Jack L Tennis racket
GB2203953A (en) * 1987-04-28 1988-11-02 Yamaha Corp Racket frames

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291574A (en) * 1976-01-05 1981-09-29 Frolow Jack L Tennis racket
GB2203953A (en) * 1987-04-28 1988-11-02 Yamaha Corp Racket frames

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003074137A1 (fr) 2002-03-07 2003-09-12 Radder, Arjen, Martijn Procede de mesure de parametres et de dispositif de frappe

Also Published As

Publication number Publication date
DE3822521A1 (de) 1990-01-11

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