BE1011745A6 - Racket - Google Patents

Racket Download PDF

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Publication number
BE1011745A6
BE1011745A6 BE9800113A BE9800113A BE1011745A6 BE 1011745 A6 BE1011745 A6 BE 1011745A6 BE 9800113 A BE9800113 A BE 9800113A BE 9800113 A BE9800113 A BE 9800113A BE 1011745 A6 BE1011745 A6 BE 1011745A6
Authority
BE
Belgium
Prior art keywords
racket
frame
sections
string
parts
Prior art date
Application number
BE9800113A
Other languages
Dutch (nl)
Original Assignee
Struyf Walter Augustinus
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 Struyf Walter Augustinus filed Critical Struyf Walter Augustinus
Priority to BE9800113A priority Critical patent/BE1011745A6/en
Application granted granted Critical
Publication of BE1011745A6 publication Critical patent/BE1011745A6/en

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Classifications

    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00Stringed rackets, e.g. for tennis
    • A63B49/02Frames
    • A63B49/038Frames with head subframes for replacing strings
    • A63B2060/002
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/62Inflatable
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/54Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Abstract

Racket, more especially for playing a ball game, such as tennis or the like, consisting of a frame (2) provided with a string (3) and a handle (4) mounted on the frame (2), characterized in that frame (2) is composed of at least two parts (8-9), respectively a first part (8) which is fixed to the handle (4) and a second part (9) in which the string (3) is fitted and which is connected to the first part (8) by means of connecting means (10), which influence the transfer of forces and vibrations.

Description


   <Desc / Clms Page number 1>
 



  Racket.



  This invention relates to a racket, more particularly to a racket for playing a ball game, such as tennis or the like.



  It is known that such rackets consist of a frame provided with a string and a handle in the form of a handle mounted on the frame.



  The frame of such rackets, which means the whole formed by the frame containing the string, the handle and the so-called neck between the frame and the handle, can be made of different materials such as wood, metal or plastic. The strings of the string can also consist of different materials such as gut or plastic.



  It is clear that, depending on the choice of materials, both of the frame and of the strings, and depending on the dimensions, the racket will exhibit different properties, including in stiffness, impact force and the like.



  The existing versions therefore have the disadvantage that certain choices must inevitably be made when choosing the racket. When one tries with certain embodiments to obtain certain favorable properties, this will usually be at the expense of other favorable properties.



  When making a choice and thus making a compromise, one should include the following typical

 <Desc / Clms Page number 2>

 properties of the known embodiments must be taken into account: - In order to somewhat reduce the efficiency loss due to the deformation of the frame, the frame can be made more rigid. However, this has the disadvantage that the shock of the impact is practically no longer absorbed by the frame but by the player's arm, which can lead to tendonitis or a so-called tennis arm.



   - The heavier arm load inherent in a rigid frame can be absorbed a little by using other string properties or changing the tension in the string, but a precise adjustment of these properties or tension in function of the rigidity of the frame difficult to realize.



   - Greater force can be delivered by means of a heavier and / or longer frame. Disadvantages, however, are the fact that the arm of the player is more heavily loaded, that the fatigue increases more quickly, especially with longer playing time, and that the racket has less mobility.



   - A racket with a light frame has the advantage that greater mobility is obtained and that the arm of the player is less stressed, but has the disadvantage that it is more difficult to achieve powerful strokes. The disadvantage of a light racket is also that the torsional forces that arise in the handle when catching a ball that ends up next to the longitudinal axis of the racket are greater than with a heavier racket.



   - A racket with a short frame has the advantage, in contrast to rackets with a relatively long frame, that the mobility and comfort are greater, but

 <Desc / Clms Page number 3>

 , on the other hand, has the disadvantage that it is more difficult to deliver powerful blows.



     - A higher tension in the string has the advantage that the torque is counteracted, but has the disadvantage that it has to be hit harder to achieve the same ball speed, because the ball is more deformed, which means a greater energy loss.



   - A high tension in the string also causes a lower playing comfort, faster wear and a shorter lifespan of the string.



   - A lower tension of the string at the impact of balls that land next to the longitudinal axis of the racket causes a torsion that causes a longer rotation, as well as a deeper asymmetric deformation of the string, so that the ball bounces under another than the targeted corner.



   - Compared to a more flexible frame, a rigid frame has the advantage that smaller vibration amplitudes occur and consequently the vibrations last less. However, the vibrations are transferred more to the player's arm, which can also give rise to the creation of a tennis arm.



  The known embodiments of rackets also have the drawback that in the event that the stringing is no longer satisfactory, for instance due to wear, stretch or breakage, it is very difficult to provide on the spot and immediately a replacement racket that shows exactly the same playing characteristics.



  The frames according to the known designs of rackets also have the disadvantage that they have to be executed with very stringent manufacturing tolerances, since small deviations very quickly have an adverse effect in terms of undesired deformations and vibrations.

 <Desc / Clms Page number 4>

 



  Another drawback of the known embodiments is that at the impact of a ball the entire frame will deform, which often means a loss of energy.



  The object of the invention is a racket in which one or more of the above-mentioned drawbacks are excluded, or at least minimized.



  More specifically, the invention has a racket as an object which has the advantage that its properties are less bound by the aforementioned compromises.



  In a preferred embodiment, the invention also contemplates a racket which additionally provides the following advantages: - that the properties of the racket can be changed by the user by means of an adjustment or by replacing certain parts; - that the characteristics of the racket can be individually adapted to the wishes of the user; - that harmful vibrations and frame distortion are significantly counteracted or eliminated, such that the arm of the player is less stressed and the risk of a tennis arm is reduced; - that by means of an additional resilience a greater efficiency can be obtained and a greater force can be delivered; - that practically the effective hitting zone is increased.



  For this purpose the invention relates to a racket, more specifically for playing a ball game, such as tennis or the like, consisting of a frame provided with a

 <Desc / Clms Page number 5>

 stringing and a handle mounted on the frame, characterized in that the frame is composed of at least two parts, a first part fixedly attached to the handle and a second part in which the stringing is arranged, and that through means of connecting means, which affect the transfer of forces and vibrations, is connected to the first part, more particularly is suspended from the first part.



  The connecting means preferably consist of means which provide a resilient and / or damping effect.



  It is clear that by means of this construction of the frame it is obtained that the transfer of vibrations and forces that arise when hitting a ball can be influenced to the first part and the handle. More specifically, by using connection means with a resilient and / or damping effect, harmful vibrations and deformations will only be weakened from the second part to the first part, so that they are less tangible for the player.



  The use of a frame consisting of two parts connected by means of connecting means also has the advantage that more technical properties can be combined in one frame and thus less compromises have to be made when choosing the racket.



  This allows, for example, that a very rigid frame can be used without the disadvantages associated with the use of such a frame in classical embodiments being felt.

 <Desc / Clms Page number 6>

 



  Other specific advantages include the following: - The use of two sections with interconnecting means that provide a damping and / or springing effect makes tolerance deviations less likely to occur when using the racket, so that the manufacturer of the frame is no longer bound to very stringent manufacturing tolerances, which in turn means that the rackets can be produced more cheaply.



   - The racket has a higher efficiency, which is obtained both directly and indirectly by the extra resilience offered by the aforementioned connecting means. The direct improvement in return is caused by the rebound of the ball due to the resilience at impact. The indirect efficiency improvement is caused by the fact that the ball is pressed less and the frame deforms less, which means that the greatest possible energy is returned to the ball.



   - Thanks to the high efficiency, faster balls can be hit with lighter rackets and therefore with less effort, or in other words the racket mobility and playing comfort increase.



   - The use of a two-piece frame, where the part with the string is suspended in a fixed part, drastically reduces the torsion in an impact where the ball ends up next to the longitudinal axis of the racket. This provides higher stroke precision and direction control, and unwanted kickback angles become rarer and smaller. It is noted that common interventions such as mass shift and racket blade extension are still possible.

 <Desc / Clms Page number 7>

 



   - Due to the resilient effect, a larger effective hitting zone is obtained when compared with a racket of known design of the same dimensions.



   - With an equal tension in the string, the playing comfort is significantly higher than with a classic racket.



     - With the racket according to the invention the tension in the string remains lower during the ball contact, the elongation at break and break limit are reached less quickly, so that the lifespan of the string is longer.



  In a preferred embodiment, the second partial frame is replaceably mounted in the first partial frame. This has the advantage that the string can be easily renewed by replacing it together with the second partial frame.



  According to a special embodiment, the aforementioned connecting means are replaceable. This allows, by replacing these connecting means with others having different properties, the damping and / or resilient effect created by these connecting means can be changed.



  According to yet a special embodiment, the racket is provided with adjusting means which allow to change the damping and / or resilient effect of the connecting means.



  In the most preferred embodiment, for the connecting means, use is made of one or more inflated or inflatable elements arranged between the parts. In the case of inflatable elements that can be inflated by the users themselves,

 <Desc / Clms Page number 8>

 these elements will preferably be provided with one or more valves arranged for this purpose. In this case, this valve functions as an adjusting means that allows to change the damping and / or resilient effect, since it allows to inflate the inflatable elements harder or less hard.



  With the insight to better demonstrate the features of the invention, some preferred embodiments are described below as examples without any limitation, with reference to the accompanying drawings, in which: figure 1 shows a racket according to the invention; figure 2 shows on a larger scale a section according to line 11-11 in figure 1; figure 3 represents a view similar to that of figure 2, but for a different embodiment; figure 4 represents a variant of a racket according to the invention; figure 5 shows on a larger scale a section according to line V-V in figure 4; figure 6 represents a view similar to that of figure 5, but for another embodiment; figure 7 represents another variant of the invention;

   figures 8 and 9 are cut on a larger scale
 EMI8.1
 represent lines according to lines VIII-VIII and IX-IX in figure 7. figure 10 shows another variant of the invention figures 11 and 12 show cross-sections on a larger scale according to lines XI-XI and XII-XII in figure 10; figure 13 represents another racket according to the invention;

 <Desc / Clms Page number 9>

 figures 14 and 15 show cross-sections on a larger scale along lines XIV-XIV and XV-XV in figure 13; figure 16 represents on a larger scale and in a secluded state the ensemble of inflatable parts which is indicated by arrow F16 in figure 13.



  As shown in figure 1, the racket 1 mainly consists of a frame 2 which is provided with a string 3 and a handle 4 arranged on the frame 2.



  Frame 2 in this case refers to the skeleton that forms the so-called head of racket 1.



  The handle 4 can be arbitrarily connected to the frame 2. Traditionally, this connection consists, as shown, of two arms 5 and 6, between which an opening is formed, which is called the heart 7 of the racket 1.



  The special feature of the invention consists in that the frame 2 is composed of at least two parts 8 and 9, respectively a first part 8, which is fixedly attached to the handle 4 and a second part 9, in which the string 3 is arranged and which, through connecting means 10, which influence the transfer of forces and vibrations, is suspended from the first part 8.



  In the embodiment of figures 1 and 2, the second part 9 is mounted concentrically in the first part 8.



  In this example, the connecting means 10 consist of a strip 11 extending continuously along the entire circumference or almost the entire circumference of the frame 2, of elastic and / or resilient and / or yielding material, which is arranged between the parts 8 and 9. You can do this

 <Desc / Clms Page number 10>

 for example, rubber or an elastic plastic are used.



  The sections 8 and 9 and the strip 11 can be connected in any way. In Figure 2, seats 12-13-14-15 are provided for this purpose on the sections 8-9 in which the strip 11 with collars 16-17-18-19 engages.



  The second part 9 is provided with openings 20 and a slot-shaped seat 21, in which the string 3, which usually consists of one continuous string 22, is attached in a classical manner.



  When using the racket 1 of Figures 1 and 2, at the impact of a ball, the second part 9 will move relative to the first part 8 according to arrows VI and / or V2. The connecting means 10, in particular the strip 11, are deformed here and cause a damping and / or resilient effect, which yields the advantages mentioned in the introduction.



  Figure 3 shows a variant in which the connecting means 10 consist of a hollow element 23 which is inflatable, for instance by means of a valve 24, which, as schematically shown in figure 1, preferably extends into the heart 7.



  By inflating the hollow element 23 harder or less hard, the connecting means 10 obtain a different stiffness and in this way different effects can be created. By "inflating" in this case it is meant that the element 23 is brought to a certain pressure, which does not necessarily mean that this element 23 actually increases in volume.

 <Desc / Clms Page number 11>

 



  If the hollow element 23 is made of a sufficiently rigid material, it can also be simply designed as an element that is not inflatable, the side flanks 25-26 then mainly acting as elastically bendable bridge pieces.



  Figures 4 and 5 show a variant in which the parts 8 and 9 are congruent and are superimposed in cross section. In this case too, the connecting means 10 consist of a strip 11 of an elastic material. The attachment between the part 8 and the strip 11, on the one hand, and between the strip 11 and the part 9, on the other hand, can in this case consist of a glue connection. However, it is not excluded to provide other connections, for example mechanical connecting means which hold the parts 8 and 9 together with the inclusion of the strip 11, but do not affect the effect of the strip 11.



  Figure 6 shows a variant of the embodiment of figure 5, wherein the connecting means 10 consist of a hollow element 23.



  It is noted that the connecting means 10, in the case that they extend continuously along the periphery of the frame 2, between the parts 8 and 9, can be in the form of a closed ring.



  On the other hand, according to another possibility, the aforementioned connecting means 10 need not necessarily be arranged continuously along the full circumference between the sections 8 and 9. After all, as shown in Figures 7 to 9, use can also be made of connecting means 10 which are composed of

 <Desc / Clms Page number 12>

 separate coupling portions 27 which extend only over certain distances and which are preferably arranged intermittently along the periphery of the frame 2, between the portions 8 and 9. Free spaces 28 can be left between these coupling parts 27.



  Figures 10 to 12 show a variant in which the sections 8 and 9 have a shell-shaped cross section and in which these sections 8 and 9 are directed towards each other with their concave sides 29 and 30. This provides the advantages that the hollow sides 29-30 can act as seats for the, for instance strip-shaped elements 31 arranged between them; that the assembly formed by the parts 8 and 9 and the elements 31 is held together in the assembled state without further connecting means; and that this can be carried out with a global cross-section that is comparable to the cross-section of the frame 2 of a classic racket.



  It is noted that the construction according to the invention, at least in embodiments as shown in figures 2-3-8 and 11, also offers the advantage that the slot-shaped seats 21 and the string 22 passing through them no longer extend to the outside of the frame 2, which prevents the contact string / playing floor and the racket 1 is more aesthetic and can be provided with a smooth outer wall 32.



  It is clear that instead of different elements 31 which are arranged along the circumference of the frame 2, between the parts 8 and 9, one continuous element 31 can also be used in a similar manner.

 <Desc / Clms Page number 13>

 



  Figures 13 to 16 show a particularly practical embodiment. The connecting means 10 in this case consist of different inflatable elements 33, for instance elastically expandable tube parts, which are mutually connected by means of channels 34. The whole can be inflated by means of a valve 24.



  The assembly of the racket 1 of figure 13 can easily be realized by arranging the stringed part 9 together with the pressureless or virtually pressureless elements 33 in the part 8 and then pressurizing the elements 33 such that the whole is brought together by the of the different shapes gets stuck together.



  It is noted that the aforementioned inflatable elements 23, 33, respectively, act as controllable means by which the behavior, more particularly the damping effect, of the connecting means 10 can be changed and adapted to the requirements of the manufacturer and / or user.



  It is clear that adjustable means can also be used that are of a different nature, a. W. wherein the control effect is not obtained by means of a medium under pressure, but in a different manner. For example, springs can be arranged between the sections 8 and 9, the spring force of which can be adjusted.



  According to another special feature of the invention, the second part 9 of the frame 2 will be replaceably mounted in the first part 8. By replaceable it is meant that this can be easily replaced by the user himself, with or without the aid of tools.

 <Desc / Clms Page number 14>

 



  Replaceability can be accomplished in several ways. In the embodiments of Figures 2,8 and 11 this can be achieved, for example, by manufacturing the connecting means 10 from a material with an elasticity such that the part 9 can be pressed out of the part 8 when a great force is exerted on it, and also again can be pressed together, the force required for this, however, being so great that the second part 9 cannot come loose from the first part 8 during normal use of the racket 1.



  In the embodiments of figure 3 and of figures 13 to 16, the replaceability can be realized by designing the inflatable elements 23 and 33 in such a way that the whole can be easily disassembled in the pressureless or virtually pressureless state.



  The fact that the second part 9 is replaceable offers the advantage that the string 3 can be replaced in a minimum of time, namely by installing a new part 9, provided with a string 3, in the racket 1, whereby by another choice of string 3 the latter can be adjusted to the wishes of the player.



  Although the connecting means 10 can in principle be fixedly attached to the fixed first part 8 in a replaceable part 9 or could be replaced according to a variant together with the part 9, it is preferred that these connecting means 10 per se are also replaceable, such that by choosing the nature of these connecting means 10 a different damping effect can be obtained.

 <Desc / Clms Page number 15>

 



  It is clear that in all the embodiments shown not only a movement according to the aforementioned arrows VI and V2 is possible, but that the second part 9 can also move a little sideways with respect to the part 8 due to the elasticity of the connecting means 10.



  According to an embodiment not shown, it is not excluded to provide an embodiment in which only one of the two movements is possible, in that case preferably the movement which allows the part 9 to move perpendicular to the plane of the frame. 2.



  It is clear that different variants are possible.



  For example, the racket 1 does not necessarily have to be of the symmetrical type and may, for example, have a deviating shape as shown in the axis of figure 1.



  Where separate coupling portions 27 are used, they may also be provided in local recesses in portions 8 and 9, in other words, the seat for these coupling portions 27 should not extend along the full circumference.



  The present invention is by no means limited to the exemplary embodiments described and shown in the figures, but such racket can be realized in various shapes and sizes without departing from the scope of the invention.

Claims (18)

Conclusions.
  1. - Racket, more especially for playing a ball game, such as tennis or the like, consisting of a frame (2) provided with a string (3) and a handle (4) mounted on the frame (2), thereby characterized in that the frame (2) is composed of at least two parts (8-9), respectively a first part (8) fixedly attached to the handle (4) and a second part (9) in which the string (3) is and which is connected to the first part (8) by means of connecting means (10), which influence the transfer of forces and vibrations.
  Racket according to claim 1, characterized in that the connecting means (10) consist of means which provide a resilient and / or damping effect.  EMI16.1  
According to claim 2, characterized in that the connecting means (10) consist of one or more elastic elements.
  Racket according to claim 3, characterized in that the connecting means (10) consist of a strip of an elastic material which is arranged between the above-mentioned parts (8-9).
  Racket according to any one of claims 1 to 3, characterized in that the connecting means (10) consist of one or more inflated or inflated elements (23 and 33, respectively) which are arranged between the aforementioned parts (8-9). .  <Desc / Clms Page number 17>  
  Racket according to claim 5, characterized in that the inflatable elements (23, 33, respectively) are provided with one or more valves (24) for pressurizing these elements (23, 33, respectively) or for releasing pressure.  EMI17.1  
Racket according to claim 6, characterized in that use is made of one valve (24) and that this valve (24) is arranged at the location of the neck, more particularly in the center (7), of the racket (1) .
Racket according to any one of the preceding claims, characterized in that the connecting means (10) extend continuously along the full circumference or substantially the full circumference of the frame (2), between the above-mentioned parts (8-9).
  Racket according to any one of claims 1 to 7, characterized in that the connecting means (10) are formed in the form of different coupling sections (27-31-33) intermittently along the periphery of the frame (2) between the two parts (8-9) of the frame (2) are fitted.
  Racket according to any one of claims 5 to 7 and according to claim 9, characterized in that the different inflatable elements (33) are mutually connected by means of channels (34).
  Racket according to any one of the preceding claims, characterized in that the second part (9) is mounted replaceably on the first part (8).
  Racket according to claim 11, characterized in that the second part (9) is replaceable in the first part  <Desc / Clms Page number 18>  (8) is mounted by means of the aforementioned connecting means (10), said connecting means (10) being contained in seats (12-13-14-15-29-30) in the sections (8-9) such that the the second part (9) from the first part (8) can be pushed out, or can be pushed back in again.
  Racket according to claim 11, characterized in that the second part (9) is mounted replaceable in the first part (8) by means of the aforementioned connecting means (10), said connecting means (10) consisting of inflatable elements (23, 33) which, in the inflated state, co-operate with seats (29-30) on one or both of the sections (8-9) such that the second section (9) is secured in the first section (8) and allow in the deflated state that the second part (9) can be removed from the first part (8).  EMI18.1  
Racket according to one of the preceding claims, characterized in that the second part (9) is mounted concentrically within the first part (8).
  Racket according to claim 14, characterized in that the sections (8-9) have shell-shaped cross sections and that these sections (8-9) in the assembled state with their  EMI18.2  hollow sides (29-30) face each other.
Racket according to any one of the preceding claims, characterized in that it is provided with adjustable means which allow to change the damping effect of the connecting means (10).  <Desc / Clms Page number 19>    EMI19.1  
Racket according to one of the preceding claims, characterized in that the connecting means (10) are replaceable, such that a different effect is obtained depending on the characteristics of these connecting means (10).
  Racket according to claim 9 or 10, characterized in that the coupling sections (27-31-33) are arranged in local recesses.
BE9800113A 1998-02-17 1998-02-17 Racket BE1011745A6 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE9800113A BE1011745A6 (en) 1998-02-17 1998-02-17 Racket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE9800113A BE1011745A6 (en) 1998-02-17 1998-02-17 Racket

Publications (1)

Publication Number Publication Date
BE1011745A6 true BE1011745A6 (en) 1999-12-07

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ID=3891094

Family Applications (1)

Application Number Title Priority Date Filing Date
BE9800113A BE1011745A6 (en) 1998-02-17 1998-02-17 Racket

Country Status (1)

Country Link
BE (1) BE1011745A6 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2401322A (en) * 2003-03-17 2004-11-10 Dunlop Slazenger Group Ltd Sports racket
GB2438172A (en) * 2006-05-15 2007-11-21 Dunlop Slazenger Group Ltd Racquet frame

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2401322A (en) * 2003-03-17 2004-11-10 Dunlop Slazenger Group Ltd Sports racket
GB2401322B (en) * 2003-03-17 2006-10-11 Dunlop Slazenger Group Ltd Sports racket
GB2438172A (en) * 2006-05-15 2007-11-21 Dunlop Slazenger Group Ltd Racquet frame

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Owner name: STRUYF WALTER AUGUSTINUS

Effective date: 20000228