Game racquet with separate head and handle portions

Information

  • Patent Grant
  • 6537165
  • Patent Number
    6,537,165
  • Date Filed
    Friday, November 2, 2001
    22 years ago
  • Date Issued
    Tuesday, March 25, 2003
    21 years ago
Abstract
A game racquet includes a head portion and a pair of removable handle portions. The head portion is adapted to support racquet strings and includes a pair of side portions which curve downwardly and inwardly at the bottom of the head. Each handle portion includes a substantially straight bottom portion and a curved top portion which is frictionally engaged with, and removable from, one of the side portions of the hoop. Dampening or resilient material is positioned between the frictionally engaged portions of the side portions and the handle portions.
Description




BACKGROUND




This invention relates to game racquets, and, more particularly, to a game racquet which includes separate head and handle portions. In the preferred embodiment shock and/or vibration absorbing material is interposed between the head and the handle.




Game racquets such as tennis racquets, racquetball racquets, and squash racquets include a head portion and a handle portion. The head portion supports a string bed, and the player holds the racquet by the handle portion.




Racquets are commonly provided with different size handles. Each handle size is intended to be used by a player with a particular hand size. There have been some attempts to provide racquets with removable handles so that a particular racquet could be fitted with a handle of the desired size. However, many prior art removable handles are heavy, difficult to replace, and/or are not securely attached to the racquet.




When a racquet impacts a ball, shock and vibration is transmitted from the head portion to the handle and thus to the player's arm. The shock and vibration can cause discomfort and fatigue and may cause injuries to the body.




SUMMARY OF THE INVENTION




The invention provides a game racquet with a lightweight removable handle which can be quickly and easily replaced yet which is securely attached to the racquet. The invention utilizes the conventional wedge-shaped throat portion of the racquet to provide a frictional and/or mechanical interlock between the head and the handle. The head includes a pair of curved throat portions which are frictionally engaged by similarly curved handle portions. In one embodiment the throat portions are tubular, and the handle portions are separate pieces. Each handle portion is inserted into one of the tubular throat portions. In another embodiment the handle portions have tubular ends which are inserted over the throat portions. In the preferred embodiment, elastomeric or polymeric material is inserted between the throat portions and handle portions to reduce shock and/or vibration or to provide comfort to the player when the racquet impacts a ball.




In the preferred embodiment for squash and racquet-ball racquets, each handle portion is inserted into one of the tubular throat portions in such a manner to permit a string hole to be drilled through each member and a grommet inserted through the string hole to allow the string to form an additional mechanical interlock between the head and the handle.











DESCRIPTION OF THE DRAWINGS




The invention will be explained in conjunction with the attached drawing, in which—





FIG. 1

is a front view of one embodiment of a racquet which is formed in accordance with the invention;





FIG. 2

illustrates the racquet of

FIG. 1

with the grip removed;





FIG. 3

illustrates the head portion of the racquet;





FIG. 4

is a side view of the head portion;





FIG. 5

is a view taken along the line


5





5


of

FIG. 3

;





FIG. 6

is a sectional view taken along the line


6





6


of

FIG. 3

;





FIG. 7

is a front view of one of the handles of the racquet;





FIG. 8

is a left side view of the handle of

FIG. 7

;





FIG. 9

is a right side view of the handle of

FIG. 7

;





FIG. 10

is a sectional view taken along the line


10





10


of

FIG. 7

;





FIG. 11

is a sectional view taken along the line


11





11


of

FIG. 7

;





FIG. 12

is a view similar to

FIG. 3

of another embodiment of a racquet head;





FIG. 13

is a side view of the head portion of

FIG. 12

;





FIG. 14

is a sectional view taken along the line


14





14


of

FIG. 12

;





FIG. 15

is a sectional view take along the line


15





15


of

FIG. 12

;





FIG. 16

is a front view of one of the handles for the head portion of

FIG. 12

;





FIG. 17

is a view similar to

FIG. 3

of still another embodiment of a racquet head;





FIG. 18

is a side view of the head portion of

FIG. 17

;





FIG. 19

is a sectional view taken along the line


19





19


of

FIG. 17

;





FIG. 20

is a sectional view taken along the line


20





20


of

FIG. 17

;





FIG. 21

is a sectional view taken along the line


21





21


of

FIG. 17

;





FIG. 22

is a front sectional view of one of the handles for the head portion of

FIG. 17

;





FIG. 23

is a side view of the handle of

FIG. 22

;





FIG. 24

is an end view taken along the line


24





24


of

FIG. 22

;





FIG. 25

is a sectional view taken along the line


25





25


of

FIG. 22

;





FIG. 26

is a sectional view taken along the line


26





26


of

FIG. 22

;





FIG. 27

is a sectional view taken along the line


27





27


of

FIG. 22

;





FIG. 28

is a front view partially broken away, of another embodiment of a racquet which is formed in accordance with the invention;





FIG. 29

is a front view, partially broken away, of the head portion of the racquet of

FIG. 28

;





FIG. 30

is a sectional view taken along the line


30





30


of

FIG. 29

;





FIG. 31

is a front view of one of the handles of

FIG. 28

;





FIG. 32

is a side view of the handle of

FIG. 31

;





FIG. 33

is an end view taken along the line


33





33


of

FIG. 31

;





FIG. 34

is a sectional view taken along the line


34





34


of

FIG. 31

;





FIG. 35

is a sectional view taken along the line


35





35


of

FIG. 31

;





FIG. 36

is a fragmentary view of the handle of

FIG. 7

with bands of shock-absorbing material;





FIGS. 37 and 38

are views similar to

FIG. 36

showing a tube and o-rings, respectively, of shock-absorbing material;





FIG. 39

is a fragmentary view of the handle of

FIG. 31

with bands of shock-absorbing material; and





FIG. 40

is a fragmentary view of the head of

FIG. 17

with bands of shock-absorbing material.











DESCRIPTION OF SPECIFIC EMBODIMENTS




Referring to

FIGS. 1 and 2

, a tennis racquet


25


includes a head portion


26


and a handle portion


27


. The handle is aligned with a longitudinal centerline CL of the racquet. The particular racquet illustrated in

FIGS. 1 and 2

is a tennis racquet. However, it will be understood that the invention can be used with other game racquets such as racquetball racquets and squash racquets.




The head portion includes a hoop


28


and a generally V-shaped or wedge-shaped throat


29


. The hoop includes a top portion


30


, side portions


31


and


32


, and a bottom or yoke portion


33


. The throat includes a pair of arms


34


and


35


which curve downwardly and inwardly from the sides of the hoop and which are formed by the sides of the head. The lower ends of the arms


34


and


35


are joined together at


36


. The yoke


33


extends between the arms


34


and


35


.




A string bed


38


is supported by the hoop


28


in the conventional manner. The string bed includes longitudinally extending main strings


39


and cross strings


40


.




Referring to

FIG. 5

, the lower ends of the arms


34


and


35


are tubular or hollow and have a generally oval shape. However, other shapes could be used. In one specific embodiment the lower end of each arm included a pair of side portions


42


and


43


having a radius of curvature R


1


on the outside surface of 1.125 inch, a pair of curved side portions


44


which extended from side portion


42


and which has a radius of curvature R


2


on the outside surface of 0.349 inch, and a pair of curved side portions


45


which extended from side portion


43


and which had a radius of curvature R


3


of 0.306 inch.




At section


6





6


which is illustrated in

FIG. 6

, the side portions


42


and


43


had radii of curvature R


4


and R


5


of 0.788 and 1.125 inch, respectively, the curved portions


44


had a radius of curvature R


6


of 0.296 inch, and the curved portions


45


had a radius of curvature of 0.272 inch.




Referring to

FIG. 3

, the inside side portion of each of the arms


34


and


35


in one specific embodiment had a radius of curvature R


8


of 21.988 inches. The outside side portion had radii of curvature R


9


-R


13


of 3.406 inches, 9.846 inches, 27.320 inches, 2.645 inches, and 27.654 inches, respectively. The radii R


10


and R


12


provide reverse bends in the outside wall of the arms


34


and


35


.




Referring to

FIG. 4

, the depth of the head portion has a dimension A at the top, a dimension B at the yoke, and a dimension C below the yoke. The lower ends of the arms


34


and


35


flare outwardly at


46


to a dimension D and continue to flare outwardly to a dimension E. In the aforementioned specific embodiment, the dimensions A-E were 0.906 inches, 1.102 inches, 1.025 inches, 1.148 inches, and 1.186 inches, respectively.




The head portion of the racquet can be made in the same manner as conventional composite racquets which are formed from resin and fibers, for example, graphite fibers. A tube or hairpin of fiber and resin forms the top and sides of the hoop and the arms


34


and


35


. The lower ends of the arms may be joined together by a wrap


47


(

FIG. 5

) of fiber and resin (pre-preg) tape. However, other means for connecting the arms together can be used so that the arms do not move relative to each other. The yoke


33


may be formed from a tube of fiber and resin which is filled with a foamable resin. The tube is joined to the arms


34


and


35


by pre-preg tape. The head is inserted into a two-part mold which has a mold cavity in the desired shape of the head. The hairpin is inflated, and the resin is cured under heat and pressure.




The handle portion


27


includes a pair of handle parts


51


and


52


(FIGS.


2


and


7


). Each handle part includes a relatively straight lower portion


53


and a curved upper portion


54


which is inserted into one of the tubular arms


34


and


35


. Referring to

FIG. 11

, each handle part includes five outside side surfaces


55


-


59


and a flat inside side surface


60


.




A pair of rectangular projections


61


and


62


extend beyond the inside surface


60


. Referring to

FIGS. 8 and 9

, the projections are on opposite sides of the longitudinal centerline CL of the handle, and the width of each projection is about one-half of the width of the handle. A recessed portion


63


on the other side of the centerline from each of the projections extends toward the outside surface


57


beyond the surface


60


.




The handle parts


51


and


52


are made from the same mold. When the handle parts


51


and


52


abut each other along their inside surfaces


60


, the projections


61


and


62


of each handle part extend into the recessed portions


63


of the other handle part. The handle parts are thereby prevented from shifting relative to each other.




After the handle parts are inserted into the arms


34


and


35


, the inside surfaces


60


abut each other along the centerline CL of the racquet, and the outside side surfaces


55


-


59


form the conventional hexagonal shape of a racquet handle or pallet. Grip tape


64


(

FIG. 1

) is spirally wound around the handle parts, and the wrapped handle has the same appearance as a conventional handle.




Referring to

FIG. 10

, the upper end


54


of each handle part has a somewhat oval cross section and includes inner and outer curved surfaces


65


and


66


and curved surfaces


67


and


68


which extend from the surfaces


65


and


66


, respectively. In the aforementioned specific embodiment, the inner curved surface


65


had a radius of curvature R


14


of 1.012 inches, and the outer curved surface


66


had a radius curvature R


15


of 0.704 inch. The surfaces


67


and


68


had a radii of curvature and R


17


of 0.150 inch and 0.231 inch, respectively.




Referring to

FIG. 7

, the upper end


54


of each handle part includes inner and outer curved surfaces


69


and


70


. The inner surface


69


curves along radii R


18


and R


19


of 4.295 inches and 28.202 inches. The outer surface curves along radius R


20


of 3.504 inches.




The curvatures of the handle parts


51


and


52


are different than the curvatures of the arms


34


and


35


of the head. When the handle parts are inserted into the arms, they exert forces on the handle parts and the arms which deform the curved surfaces enough to allow the handle parts to be inserted. The deformation creates forces which restrain removal of the handle parts from the arms. However, the handle parts can be removed from the arms by exerting enough force to overcome those forces.




In the preferred embodiment, elastomeric or polymeric material is inserted between the upper ends of the handle parts and the arms


34


and


35


. The elastomeric or polymeric material can be material for dampening or absorbing shock and/or vibration or can be resilient material for providing comfort to the player when the racquet impacts a ball. Specific materials include rubber, epoxidized natural rubber, urethane, EVA, or other material which dampens or absorbs shocks and/or vibrations, and polybutadiene, rubber, or other resilient material. Referring to

FIGS. 36-38

, the elastomeric or polymeric material is advantageously in the shape of a tube or a plurality of bands or o-rings which fit over the end of each handle part. The material separates the head and the handle parts and reduces the transmission of shocks and vibrations from the head to the handle.




In

FIG. 36

a plurality of bands or tubes


70


of shock and/or vibration absorbing material or resilient material are slipped over the curved upper end


54


of the handle parts


51


and


52


.

FIG. 37

illustrates a continuous elongated sleeve or tube


71


of shock-absorbing or resilient material. In

FIG. 38

o-rings


72


of shock-absorbing or resilient material are slipped over the upper end of the handle part.




The dampening or resilient material does not have to extend around the handle. Pieces of the material could be attached to the handle parts, for example, by adhesive, or the material could be molded into the handle parts by inserting the material into the mold for the handle part before the part is molded.




The curved upper ends of the handle parts provide a good mechanical interlock between the handle parts and the arms


34


and


35


. No adhesive bonding is required, and the handle parts will not separate from the arms during normal tennis play. The size and/or shape of the handle of a racquet can be changed by removing one size or shape of handle parts and inserting handle parts of the desired size or shape.




If shock and/or vibration absorbing material or resilient material is inserted between the head and the handle parts, that material provides additional friction which resists separation of the handle parts from the head.




The handle parts can be formed from graphite and can be filled with foamed resin if desired. Other suitable materials for the handle parts include injection molded nylon, thermoplastics, wood, and other structural materials. The weight and balance of the handle can be adjusted by removing material in various locations along the inside surfaces


60


.





FIGS. 12-16

illustrate a racquetball racquet which includes a head


75


and a pair of handle parts


76


. Referring to

FIG. 12

, the head


75


does not include a yoke. Two hollow side portions


76


and


77


of the head curve toward each other to form a throat and are joined at


78


.




Referring to

FIG. 14

, the cross section of the end of each of the side portions


76


and


77


is somewhat D-shaped and includes a curved outer wall


79


and a straight inner wall


80


. The two inner walls


80


are joined together. Referring to

FIG. 15

, the cross section of each of the side portions at section


15


-


15


is substantially oval.




Referring to

FIG. 16

, the two handle parts


76


are similar to the handle parts


51


and


52


. Each handle part includes a straight lower portion


83


and a curved upper portion


84


which is inserted into one of the hollow side portions


76


or


77


of the head. A pair of projections


85


on each handle part fits into a correspondingly shaped recess


86


on the other handle part.




The shapes and curvatures of the hollow side portions


76


and


77


of the head and of the curved upper ends of the handle parts are selected so that the head and arms are deformed when the handle parts are inserted to provide a good mechanical lock.




Dampening or resilient material, for example, in the shape of bands, a tube, or o-rings as illustrated in

FIGS. 36-38

, is advantageously positioned on the curved end portion of each of the handle parts.





FIGS. 17-27

illustrate another embodiment of a racquet which includes a head


90


and a pair of handle parts


91


. The head portion includes a hoop


93


and a pair of side portions or arms


94


and


95


which curve downwardly and inwardly toward the longitudinal centerline CL of the racquet. A yoke


96


extends between the side portions and forms the bottom of the hoop.




Each handle part


91


includes a straight portion


97


and a curved, hollow upper end portion


98


. The inside surfaces of the hollow end portions


98


are sized to permit insertion of the arms


94


and


95


of the head. Before the arms


94


and


95


are inserted into the handle parts, bands


99


of dampening or resilient material (

FIG. 40

) may be ensleeved over the arms


94


and


95


. Alternatively, a tube or o-rings or other shapes of dampening or resilient material can be used.




In one specific embodiment of the head


90


, the arms


94


and


95


of the head flared inwardly from section


19





19


(

FIG. 17

) to section


20





20


to form an attaching portion


101


which terminates at a shoulder


102


. Comparing

FIGS. 18-21

, the attaching portion


101


tapers inwardly from section


20





20


to section


21





21


. The dimensions F and G and the radii of curvature R


21,


R


22,


R


23,


and R


24


at the three sections are listed in inches in Table 1.














TABLE 1









Section 19-19




Section 20-20




Section 21-21




























F




1.155




0.993




0.972







G




0.680




0.552




0.514







R


21






0.775




1.090




1.204







R


22






0.811




1.272




1.485







R


23






0.154




0.187




0.194







R


24






0.179




0.200




0.206















The radius of curvature R


25


of the inside surface


102


(

FIG. 17

) of the arms


94


and


95


was 12.429 inches, and the radius of curvature R


26


of the outside surface


103


was 12.252 inches.




Referring to

FIG. 22

, inside surface


105


of the handle


91


had a radius of curvature R


27


of 12.572 inches, and outside surface


106


had a radius of curvature R


28


of 12.154 inches.




The hollow upper end of the handle had dimensions H and I (

FIG. 24

) of 1.198 inches and 0.719 inch and the following radii of curvature:





















R


29






1.188 inches







R


30






1.370 inches







R


31






0.285 inches







R


32






0.298 inches















The hollow end of the handle tapers inwardly from section


24


to section


25


. Section


25


had dimensions H and I of 1.167 inches and 0.711 inch and the following radii of curvature:





















R


29






1.303 inches







R


30






1.583 inches







R


31






0.293 inch







R


32






0.305 inch















As the arms


94


and


95


of the head are inserted into the upper ends of the handle parts


91


, the differences in the curvatures and the tapers deform the material and provide a wedge fit, and the two parts are firmly secured by frictional forces. However, the handle can be removed when desired by exerting enough pulling force to overcome the frictional retention force.





FIG. 28

illustrates a squash racquet


108


which includes a head


109


and a pair of handle parts


110


and


111


. The head supports main strings


112


and cross strings


113


which provide a planar strung hitting surface.




The head includes tubular side portions


114


and


115


which are joined at the bottom of the head to form a throat. Referring to

FIG. 30

, the bottom ends of the side portions are substantially oval or elliptical. However, other shapes can be used.




Turning to

FIGS. 31 and 32

, each of the handle parts


110


and


111


includes a straight lower portion


116


and a curved upper portion


117


. The lower portion includes a straight inside surface


118


. Projections


119


and


120


extend beyond the surface


118


on one side of the longitudinal centerline CL of the handle, and projection


121


is located on the other side of the centerline. The projections of each handle part fit into recesses


122


in the other handle part.




Bands


123


(

FIG. 39

) of shock and/or vibration absorbing material are slipped over the curved upper end of each handle part. Alternatively, a tube or o-rings or other shapes of absorbing material can be used.




The curved upper ends of the handle parts


110


and


111


are inserted into the hollow side portions


114


and


115


of the head


109


. The shapes and curvatures of the interfitting parts are such that a mechanical interlock is provided which retains the handle parts in the head during normal play. However, the handle parts can be removed when desired.




In the preferred embodiment of the squash racquet, each of the side portions


114


and


115


of the head


109


is provided with string holes


125


(FIG.


29


), and the upper end of each of the handle parts


110


and


111


is provided with string holes


126


(FIG.


32


). The string holes can be drilled in the head and handle parts either before or after the handle parts are inserted into the head. When the racquet is strung, two of the main strings are inserted through the aligned holes in the head and each handle part to form an additional mechanical interlock between the head and the handle. A conventional grommet can be inserted through each string hole before stringing.




Similar string holes can also be provided I the head and handle parts of tennis and racquetball racquets.




While in the foregoing specification a detailed description of specific embodiments of the invention has been set forth for the purpose of illustration, it will be understood that many of the details hereingiven can be varied considerably by those skilled in the art without departing from the spirit and scope of the invention.



Claims
  • 1. A game racquet comprising:a) a head portion, the head portion being adapted to support a string bed and having a top and opposite side portions and a longitudinal centerline, each of the side portions extending downwardly and toward the longitudinal centerline of the head, the head portion having a lower end and at least one opening formed into the lower end of the head portion, and b) a pair of handle portions, each of the handle portions having a substantially straight bottom portion which is positioned adjacent the longitudinal centerline of the head and a curved top portion which curves upwardly and away from the longitudinal centerline of the head and which is frictionally engaged with, and removable from, one of the side portions of the head, the handle portions being inserted into the opening of the head portion.
  • 2. The racquet of claim 1 in which each of the side portions includes a bottom end which is joined to the bottom end of the other side portion.
  • 3. The racquet of claim 1, wherein each of the side portions includes a bottom end, wherein the at least one opening includes a separate bottom end opening defined in the bottom end of each side portion, and wherein the handle portions are inserted into the bottom end openings of the side portions.
  • 4. A game racquet comprising:a) a head portion, the head portion being adapted to support a string bed and having a top and opposite side portions and a longitudinal centerline, each of the side portions extending downwardly and toward the longitudinal centerline of the head, b) a pair of handle portions, each of the handle portions having a substantially straight bottom portion which is positioned adjacent the longitudinal centerline of the head and a curved top portion which curves upwardly and away from the longitudinal centerline of the head and which is frictionally engaged with, and removable from, one of the side portions of the head, each of said side portions being tubular and the handle portions being separate from each other and the curved top portion of each of the handle portions inserted into one of the tubular side portions, each handle portion including a substantially flat inside surface which abuts the inside surface of the other handle portion.
  • 5. The racquet of claim 1 including material selected from the class of dampening material, absorbing material, and resilient material inserted between the side portions and the handle portions.
  • 6. The racquet of claim 5 in which said material is in the form of bands on the curved top portion of each of the handle portions.
  • 7. The racquet of claim 4 further comprising material selected from the class of dampening material, absorbing material, and resilient material inserted between the side portions and the handle portions.
  • 8. The racquet of claim 7 wherein the material is in the form of bands positioned on the curved top portion of each of the handle portions.
  • 9. A game racquet comprising:a) a head portion, the head portion being adapted to support a string bed and having a top and opposite side portions and a longitudinal centerline, each of the side portions extending downwardly and toward the longitudinal centerline of the head, b) a pair of handle portions, each of the handle portions having a substantially straight bottom portion which is positioned adjacent the longitudinal centerline of the head and a curved top portion which curves upwardly and away from the longitudinal centerline of the head and which is frictionally engaged with, and removable from, one of the side portions of the head, and c) material selected from the class of dampening material, absorbing material, and resilient material inserted between the side portions and the handle portions the handle portions being separate from each other and each handle portion including a substantially flat inside surface which abuts the inside surface of the other handle portion.
  • 10. The racquet of claim 9 in which each of the handle portions includes a projection which extends beyond the flat inside surface of the handle portion and into a recess in the other handle portion.
  • 11. A game racquet comprising:a) a head portion, the head portion being adapted to support a string bed and having a top and opposite side portions and a longitudinal centerline, each of the side portions extending downwardly and toward the longitudinal centerline of the head, b) a pair of handle portions, each of the handle portions having a substantially straight bottom portion which is positioned adjacent the longitudinal centerline of the head and a curved top portion which curves upwardly and away from the longitudinal centerline of the head and which is frictionally engaged with, and removable from, one of the side portions of the head, and c) material selected from the class of dampening material, absorbing material, and resilient material inserted between the side portions and the handle portions, said material being in the form of a tube on the curved top portion of each of the handle portions.
  • 12. The racquet of claim 11 in which each of the side portions and each of the handle portions is provided with a string hole for receiving racquet string.
  • 13. A game racquet comprising:a) a head portion, the head portion being adapted to support a string bed and having a top and opposite side portions and a longitudinal centerline, each of the side portions extending downwardly and toward the longitudinal centerline of the head, b) a pair of handle portions, each of the handle portions having a substantially straight bottom portion which is positioned adjacent the longitudinal centerline of the head and a curved top portion which curves upwardly and away from the longitudinal centerline of the head and which is frictionally engaged with, and removable from, one of the side portions of the head, the top portion of each of the handle portions being inserted into the tubular top portion of one of the handle portions.
  • 14. The racquet of claim 13 including material selected from the class of dampening material, absorbing material, and resilient material inserted between the side portions and the handle portions.
  • 15. The racquet of claim 14 in which said material includes at least one band on each of the side portions which separates the side portion from the associated handle portion.
  • 16. A game racquet comprising:a) a head portion, the head portion being adapted to support a string bed and having a top and opposite side portions and a longitudinal centerline, each of the side portions extending downwardly and toward the longitudinal centerline of the head, b) a pair of handle portions, each of the handle portions having a substantially straight bottom portion which is positioned adjacent the longitudinal centerline of the head and a curved top portion which curves upwardly and away from the longitudinal centerline of the head and which is frictionally engaged with, and removable from, one of the side portions of the head, the handle portions being separate from each other and each handle portion including a substantially flat inside surface which abuts the inside surface of the other handle portion.
  • 17. The racquet of claim 16 in which each of the handle portions includes a projection which extends beyond the flat inside surface of the handle portion and into a recess in the other handle portion.
  • 18. The racquet of claim 16 further comprising material selected from the class of dampening material, absorbing material, and resilient material inserted between the side portions and the handle portions.
  • 19. The racquet of claim 18 wherein the material is in the form of bands positioned on the curved top portion of each of the handle portions.
  • 20. A game racquet comprising:a) a head portion, the head portion being adapted to support a string bed and having a top and opposite side portions and a longitudinal centerline, each of the side portions extending downwardly and toward the longitudinal centerline of the head, b) a pair of handle portions, each of the handle portions having a substantially straight bottom portion which is positioned adjacent the longitudinal centerline of the head and a curved top portion which curves upwardly and away from the longitudinal centerline of the head and which is frictionally engaged with, and removable from, one of the side portions of the head, each of the side portions and each of the handle portions being provided with a string hole for receiving a racquet string.
  • 21. The racquet of claim 20 further comprising material selected from the class of dampening material, absorbing material, and resilient material inserted between the side portions and the handle portions.
  • 22. The racquet of claim 21 wherein the material is in the form of bands positioned on the curved top portion of each of the handle portions.
US Referenced Citations (8)
Number Name Date Kind
4139194 Fischer Feb 1979 A
4360202 Lo Nov 1982 A
4609198 Tarr Sep 1986 A
4906002 Goffney et al. Mar 1990 A
4915382 Madsen Apr 1990 A
4988100 Shu et al. Jan 1991 A
5560600 FitzSimons et al. Oct 1996 A
6071203 Janes et al. Jun 2000 A
Foreign Referenced Citations (6)
Number Date Country
3521621 Jan 1986 DE
3923268 Jan 1991 DE
130620 Jan 1985 EP
519312 Dec 1992 EP
531806 Mar 1993 EP
8604251 Jul 1986 WO
Non-Patent Literature Citations (2)
Entry
“The ISIS System” from 1992 Catalog of Dunlop Slazenger Corporation.
“ISIS—Impact Shock Isolation System” from Dunlop 1994 Tennis Catalog.