EP1080746A1 - Dispositif amortisseur de vibrations d'une raquette - Google Patents

Dispositif amortisseur de vibrations d'une raquette Download PDF

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Publication number
EP1080746A1
EP1080746A1 EP99890282A EP99890282A EP1080746A1 EP 1080746 A1 EP1080746 A1 EP 1080746A1 EP 99890282 A EP99890282 A EP 99890282A EP 99890282 A EP99890282 A EP 99890282A EP 1080746 A1 EP1080746 A1 EP 1080746A1
Authority
EP
European Patent Office
Prior art keywords
racket
free
piezoelectric
damping
area
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Withdrawn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
EP99890282A
Other languages
German (de)
English (en)
Inventor
Herfried Dipl.-Ing. Lammer
Iris Dipl.-Ing. Köstinger
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.)
Head Sport GmbH
Original Assignee
Head Sport 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 Head Sport GmbH filed Critical Head Sport GmbH
Priority to EP99890282A priority Critical patent/EP1080746A1/fr
Publication of EP1080746A1 publication Critical patent/EP1080746A1/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Withdrawn legal-status Critical Current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
    • A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Definitions

  • the invention relates to a device for damping the Vibrations of a ball racket, especially a tennis racket.
  • Conventional devices for damping vibrations Tennis rackets rely on energy absorption through friction or internal friction of materials between the handle shell a racket handle and the frame bars of the racket frame were ordered. To absorb significant energy relatively heavy components are usually required. This applies all the more if the club weight is relatively low, so that the damping elements to be provided for the absorption of energy a significant proportion of the total weight of the racket to reach. Because such damping components abound in usually arranged in the grip area, a Handle-heavyness of the racket. To subsequently be top-heavy To make rackets, compensation weights must be in the head area be arranged, which increases the total weight of the Racket in turn increased.
  • the natural frequency of modern rackets with relatively light weight and especially with a weight between 200 and 250 g is depending on the choice of material
  • Racket frame at frequencies of about 180 to 280 Hz, where this natural frequency is the first mode of a free-free oscillation, where the racket is not clamped.
  • Characteristic for such a free-free vibration is the Circumstance that a maximum amplitude of the vibration on head end and at the handle end as well as in a middle Area is present.
  • the area of the covered area also lies like the end area of the handle facing the covered surface in a vibration node.
  • the arrangement of damping elements leads in the area of covering whenever this element is located near a vibration node relative to one little impact and thus a relatively small one Damping.
  • the invention now aims with the least possible additional Effective cushioning of rackets with to achieve particularly low weight and coordination the damping exactly to the requirements of an effective To be able to adjust damping.
  • the training according to the invention essentially consists in that in or on the frame bars in the area of the covering, on Club head and / or piezoelectric crystals in the grip area are arranged, their electrical voltage when vibrating via at least one ohmic resistor and / or at least a coil is short-circuited.
  • Piezoelectric crystals as known for example from crystal sound recorders are, when they are excited to vibrate, electrical voltages.
  • the resistance is particularly advantageous as low-resistance resistor with a value of about 200 ⁇ .
  • a particularly selective and efficient damping succeeds if the training is done so that the capacity of the piezoelectric crystal and the inductance of the coil so are chosen so that the resonance frequency of the LC element on the free-free-natural vibration of the racket is tuned, whereby for easier tuning the coil in a particularly advantageous Formed trimmable.
  • Piezoelectric crystals show a defined capacity, which corresponds to the excitation frequency changes. Knowing the chosen piezoelectric Crystals and thus also in knowledge of the capacity can particularly effective and efficient damping achieved be that the resonance frequency of an LC element, which in addition the capacitance of the piezoelectric crystal an inductance a coil includes, exactly on a certain natural vibration of the Racket is tuned.
  • the training according to the invention is further developed that the piezoelectric crystals in cross sections of the Frame spars are arranged in which a belly of vibration free-free-natural vibration of the ball racket lies.
  • FIG. 1 shows a plan view of a racket
  • 2 is a side view in the direction of arrow II of FIG. 1st with the schematic representation of the free-free natural frequency first order
  • Fig. 3 is a schematic arrangement of the device for dampening the vibrations of a ball racket with a piezoelectric crystal and a low resistance
  • FIG. 4 shows a modified embodiment of FIG. 3 of a device with a piezoelectric crystal and a coil.
  • FIG. 1 shows a tennis racket 1 with a string oval 2 and a handle 3 shown.
  • the frame bars 4 are in Area of covering on the connection to the handle parts, on Club head and in the area of the handle 3 piezoelectric Means 5 for damping the vibrations of the ball racket arranged, the arrangement corresponding to that in FIG. 2 with 6 designated free-free vibration of the first order.
  • the vibration node 7 of this free-free vibration first Order enforce the covering oval 2 and the handle 3 where on the other hand, the maximum amplitudes a in the region of the antinode each at the head end and at the handle end the ball racket, as well as in the chosen representation in the lower Area of the covering oval 2 lie.
  • the piezoelectric damping devices 5 are arranged.
  • FIG. 3 shows a piezoelectric damping device, which consists of a piezoelectric crystal 8, the Electrodes 9 short-circuited via a low-resistance resistor 10 are.
  • the piezoelectric crystal creates when it is vibrated by the tennis racket 1, an electrical voltage, which over the low-resistance 10 is short-circuited, whereby vibration energy into thermal Energy is converted and damping one accordingly broad frequency band effectively.
  • Fig. 4 is a modified form of Fig. 3 is a Piezoelectric damping device shown, in which the Electrodes 9 of the piezoelectric crystal 8 via a trimmable Coil 11 are short-circuited.
  • the resonance frequency of the LC element can be adjusted the determination of the capacitance of the piezoelectric crystal 8 can be adjusted by trimming the coil 11.
  • Attenuation means a selective attenuation of individual frequencies can be achieved, with which an extremely efficient damping of the Tennis racket succeeds.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Vibration Prevention Devices (AREA)
EP99890282A 1999-09-01 1999-09-01 Dispositif amortisseur de vibrations d'une raquette Withdrawn EP1080746A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99890282A EP1080746A1 (fr) 1999-09-01 1999-09-01 Dispositif amortisseur de vibrations d'une raquette

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99890282A EP1080746A1 (fr) 1999-09-01 1999-09-01 Dispositif amortisseur de vibrations d'une raquette

Publications (1)

Publication Number Publication Date
EP1080746A1 true EP1080746A1 (fr) 2001-03-07

Family

ID=8244009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99890282A Withdrawn EP1080746A1 (fr) 1999-09-01 1999-09-01 Dispositif amortisseur de vibrations d'une raquette

Country Status (1)

Country Link
EP (1) EP1080746A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6974397B2 (en) * 2000-08-01 2005-12-13 Head Sport Aktiengesellschaft Racket with self-powered piezoelectric damping system
US7080849B2 (en) 2002-01-14 2006-07-25 Head Sport Ag Ski, method of stiffening the ski and method of manufacturing the ski

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011756A1 (fr) * 1995-09-29 1997-04-03 Active Control Experts, Inc. Materiel de sport adaptable
US5651545A (en) 1995-06-07 1997-07-29 Roush Anatrol, Inc. Vibration damping device for stringed racquets
US5775715A (en) * 1995-08-01 1998-07-07 K-2 Corporation Piezoelectric damper for a board such as a snow ski or snowboard
WO1998034689A1 (fr) * 1997-02-07 1998-08-13 Active Control Experts, Inc. Article adaptatif de sport dont l'amortissement peut etre selectionne ou adapte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651545A (en) 1995-06-07 1997-07-29 Roush Anatrol, Inc. Vibration damping device for stringed racquets
US5775715A (en) * 1995-08-01 1998-07-07 K-2 Corporation Piezoelectric damper for a board such as a snow ski or snowboard
WO1997011756A1 (fr) * 1995-09-29 1997-04-03 Active Control Experts, Inc. Materiel de sport adaptable
WO1998034689A1 (fr) * 1997-02-07 1998-08-13 Active Control Experts, Inc. Article adaptatif de sport dont l'amortissement peut etre selectionne ou adapte

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6974397B2 (en) * 2000-08-01 2005-12-13 Head Sport Aktiengesellschaft Racket with self-powered piezoelectric damping system
US7160286B2 (en) 2000-08-01 2007-01-09 Head Sport Ag Racket with self-powered piezoelectric damping system
US7080849B2 (en) 2002-01-14 2006-07-25 Head Sport Ag Ski, method of stiffening the ski and method of manufacturing the ski

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