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WO1993013832A2 - Procede et dispositif de detection des forces de traction lors du cordage de raquettes - Google Patents

Procede et dispositif de detection des forces de traction lors du cordage de raquettes Download PDF

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Publication number
WO1993013832A2
WO1993013832A2 PCT/EP1993/000092 EP9300092W WO9313832A2 WO 1993013832 A2 WO1993013832 A2 WO 1993013832A2 EP 9300092 W EP9300092 W EP 9300092W WO 9313832 A2 WO9313832 A2 WO 9313832A2
Authority
WO
WIPO (PCT)
Prior art keywords
strings
kpl
szl
szq
factor
Prior art date
Application number
PCT/EP1993/000092
Other languages
German (de)
English (en)
Other versions
WO1993013832A3 (fr
Inventor
Ulrich Kühnel
Original Assignee
Kuehnel Ulrich
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 Kuehnel Ulrich filed Critical Kuehnel Ulrich
Priority to JP5512152A priority Critical patent/JPH06508790A/ja
Publication of WO1993013832A2 publication Critical patent/WO1993013832A2/fr
Publication of WO1993013832A3 publication Critical patent/WO1993013832A3/fr

Links

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
    • A63B51/14—Arrangements for stringing, e.g. for controlling the tension of the strings during stringing

Definitions

  • the invention relates to a method for determining the tensile forces for stringing rackets, the string bed of which has parallel main strings and cross strings which are parallel to one another.
  • the invention relates in particular to the stringing of tennis racquets and is used to tension the stringing with an optimal tensile force for the sport to be practiced.
  • an oval frame attaches to the shaft of the racket, which is usually provided with a grip band, the base of which forms the heart of the frame on the shaft.
  • the area enclosed by the frame is filled with the strings, the relevant lengths of the cross and main strings being understood as the clear distance between the frame boundaries over which the respective string lengths run.
  • the invention has for its object to use a method and a device to determine the tensile forces for stringing the racket so that inhomogeneities in the stringing bed are largely avoided in stringing and the stringing hardness can be individually adjusted to the player.
  • KPQ [N] KPL * LQ [mm]: LL [mm], is determined, and that the tensile force KPL with factors for the number of strings of the main strings SZL and / or the tension level SN and / or the impact type ST and / or the Frame hardness RH is multiplied, which are stored and can be selected by the user.
  • ⁇ A and ⁇ B are to be understood as tolerance limits, which are approx. + 5%, however, as a rule, ⁇ A and ⁇ B apply to zero.
  • An advantageous embodiment of the method according to the invention is characterized in that the tensile force KPQ is multiplied by factors for the number of strings of the cross strings SZQ and / or the type of beating ST, which are stored and can be selected by the user.
  • Characteristics of the cross string covering can thus be taken into account in an advantageous manner.
  • the device according to the invention for carrying out the method with a display unit, a microprocessor and a keyboard is characterized in that the keyboard keys for directly calling up the factors for the number of strings of the main strings SZL and / or the number of strings of the cross strings SZQ and / or the tension level SN and / or the impact type ST and / or and the frame hardness RH and for entering the values of LL, LQ, SZL and SZQ.
  • This configuration of the device according to the invention advantageously ensures that the tensile forces can be calculated simply and quickly.
  • An advantageous embodiment of the device according to the invention is characterized in that a measuring tape is integrated in the device and that an input device is provided which comprises an interface between the measuring tape and the microprocessor and an input key, the values LL and LQ being entered via the input key in enter the microprocessor.
  • the values LL and LQ can thus be entered into the microprocessor in a simple manner and no measurement errors can occur.
  • Fig. 2 is a plan view of an embodiment of the device according to the invention.
  • step c) multiplication KPL by the factor for SZL for the number of strings of the main strings, d) multiplying the result of step c) by the factor SN for the voltage level,
  • step d) multiplying the result of step d) by the factor ST for the type of stroke
  • step f) multiplying the result of step e) by the factor RH for the frame hardness
  • KPQ KPL KOR * (LQ: LL),
  • step i) adding a factor ⁇ ST to the result of step i) with players who strokes with topspin.
  • Fig. 1 shows a diagram for explaining the method according to the invention, the course of the calculations can be seen. The following factors are used, which are stored in a memory of the microprocessor and can be called up by it:
  • RH FLE is a flexible racket and RH ST is a rigid racket
  • ST STR is chosen for a player who prefers straight strokes and ST TOP is chosen for a player who prefers topspin strokes
  • the KPQ KOR value is rounded as follows:
  • LQ: LL 0.75 is selected if LQ: LL is less than 0.75.
  • a string diameter can be suggested so that the choice of strings can also be made optimally.
  • the corresponding string diameters can be stored in a table in the microprocessor.
  • the device 2 according to FIG. 2 for determining the tensile forces for stringing rackets has a display unit 4, a microprocessor and a keyboard 6, the keyboard 6 keys for directly calling up the factors for the number of strings of the main strings SZL and / or the number of strings of the cross strings SZQ and / or the voltage level SN and / or the impact type ST and / or and the frame hardness RH and for entering the values of LL, LQ, SZL and SZQ.
  • a measuring tape is integrated in the device.
  • An input device is provided which comprises an interface between the measuring tape and the microprocessor and an input key, wherein the values LL and LQ can be input to the microprocessor via the input key.
  • the longest main string LL and the longest cross string are first made using the measuring tape. LQ measured and the values entered. 2, these values are 320 mm and 245 mm, respectively. The entry is made via the enter key 8, which is pressed when the measuring tape is applied to the longest main string or longest cross string. The device is switched on the first time a key on the keyboard is pressed. Next, one key each of the SZL and SZQ keys is pressed, depending on the number of main strings and the number of cross strings. In Fig. 2, the key for SZL 14 for 14 main strings and SZQ 16 for 16 cross strings was pressed, which can be seen from the display.
  • RH FLE flexible racket
  • RH STI rigid racket
  • the flexible club button has been pressed and FLE appears on the display.
  • press one of the SN keys to enter one of the factors SN MIN , SN OPT or SN MAX .
  • the factor SN OPT was entered and OPT appears in the display.
  • ST STR straight strokes
  • ST TOP topsin strokes
  • the device calculates the optimal tensioning forces, in the case shown in FIG. 2, as 29.5 kp for the main strings and 23.0 kp for the cross strings.
  • the device can perform the required arithmetic operations simultaneously with the input of the factors.
  • the factor to be entered next is requested by lighting up a marking in the relevant field of the display.
  • the display LL can first light up in the field provided for the length of the longest main string, which is then replaced by the number after the corresponding value has been entered. Next, LQ lights up in the relevant field, etc. This results in user guidance in relation to the sequence of the parameters to be entered.
  • the clamping forces are displayed in kp and the length dimensions in mm.
  • the display can also be set to lb (pound) and inch. This setting can be made by the manufacturer or by an additional button (not shown).
  • the outer shape of the device 2 shown in FIG. 2 is adjusted so that the device is easy to use as a hand-held device.
  • the device has the shape of a handle in the lower area, while the upper area is swinging out and semicircular in order to provide enough space for the display on the one hand and enough space for the measuring tape inside the device on the other hand.
  • a string diameter is also to be displayed after the tension forces have been determined, a corresponding field is provided in the display (not shown).

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

Selon un procédé de détection des forces de traction lors du cordage de raquettes dont le lit de cordes comprend des cordes longitudinales parallèles à des cordes transversales parallèles, la force de traction KPL des cordes longitudinales KPL est déterminée en fonction de la longueur LL du côté longitudinal le plus long entre la tête de la raquette et le c÷ur du cadre dans le lit de cordes et la force de traction KPQ des cordes transversales est déterminée en fonction de la longueur de la plus longue corde transversale LQ dans le lit de cordes, de la longueur du côté longitudinal le plus long LL et de la force de traction KPL. La force de traction KPL est multipliée par des facteurs représentant le nombre de cordes longitudinales SZL, le niveau de tension SN, le type de frappe ST et la dureté du cadre RH. La force de traction KPQ est multipliée par des facteurs représentant le nombre de cordes transversales SZQ et le type de frappe ST. Les facteurs sont mémorisés et peuvent être sélectionnés par l'utilisateur. Le dispositif de détection des forces de traction lors du cordage de raquettes comprend une unité d'affichage, un microprocesseur et un clavier avec des touches permettant de sélectionner directement les facteurs représentant le nombre de cordes longitudinales SZL, le nombre de cordes transversales SZQ, le niveau de tension SN, le type de frappe ST et/ou la dureté du cadre RH, et de saisir les valeurs de LL, LQ, SZL et SZQ.
PCT/EP1993/000092 1992-01-17 1993-01-15 Procede et dispositif de detection des forces de traction lors du cordage de raquettes WO1993013832A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5512152A JPH06508790A (ja) 1992-01-17 1993-01-15 ガット張りラケットの引張力の決定方法及び装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4201144A DE4201144A1 (de) 1992-01-17 1992-01-17 Verfahren und vorrichtung zur bestimmung der zugkraefte zum besaiten von schlaegern
DEP4201144.2 1992-01-17

Publications (2)

Publication Number Publication Date
WO1993013832A2 true WO1993013832A2 (fr) 1993-07-22
WO1993013832A3 WO1993013832A3 (fr) 1994-04-14

Family

ID=6449719

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1993/000092 WO1993013832A2 (fr) 1992-01-17 1993-01-15 Procede et dispositif de detection des forces de traction lors du cordage de raquettes

Country Status (6)

Country Link
EP (1) EP0576654A1 (fr)
JP (1) JPH06508790A (fr)
AU (1) AU3410393A (fr)
CA (1) CA2106101A1 (fr)
DE (1) DE4201144A1 (fr)
WO (1) WO1993013832A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3279456D1 (en) * 1982-04-29 1989-03-30 Soong Tsai C String load apportioned racket
WO1992006748A1 (fr) * 1990-10-16 1992-04-30 Kuehnel Ulrich Procede de cordage de raquettes
DE9016980U1 (de) * 1990-12-17 1991-03-07 Korte-Jungermann, Hans-Werner, 4156 Willich Schläger für Ballspiele

Also Published As

Publication number Publication date
JPH06508790A (ja) 1994-10-06
AU3410393A (en) 1993-08-03
EP0576654A1 (fr) 1994-01-05
CA2106101A1 (fr) 1993-07-18
DE4201144A1 (de) 1993-07-22
WO1993013832A3 (fr) 1994-04-14

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