Games using tangible projectile – Player held and powered – nonmechanical projector – per se,... – Racket or paddle; accessory therefor
Reexamination Certificate
2000-09-13
2001-11-20
Chiu, Raleigh W. (Department: 3711)
Games using tangible projectile
Player held and powered, nonmechanical projector, per se,...
Racket or paddle; accessory therefor
Reexamination Certificate
active
06319160
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to the tennis rackets and more particularly to a string attachment which dampens the striking stress and absorbs the vibration on the string surface in order to prevent a tennis elbow may be caused to the player. Besides, this string attachment is replaceable to maintain the durability of the racket.
Recently, a pretty sum of tennis rackets having damping ability of vibration have been appeared in the market, But few of them can scatter the vibrations on the string surface or has an attachment for suspending the strings which is replaceable.
FIGS. 1
,
2
,
3
and
4
shows a typical tennis racket
10
which includes a head
11
, a groove in the outer periphery of the frame, a plurality of stringing holes
12
formed spaced apart in the groove, a plurality of aligned thru holes
13
formed spaced apart in the lateral walls of the groove positioned alternately with the stringing holes
12
for securing a plurality of shafts
14
therein and a plurality of rotors
15
rotatably secured on the shafts
14
. The rotor
15
has an axial hole
151
engaged with the shaft
14
and a string groove
152
centrally formed in outer periphery for suspending from the strings
16
therein. The shafts
14
are reinforced with paintings. So that is not durable. Besides, a plurality of aligned thru holes
13
in the lateral walls of the groove may cause cracks on the frame or cause the shaft to break so that the racket becomes useless.
SUMMARY OF THE PRESENT INVENTION
The present invention has a main object to provide an attachment for a tennis racket by which the strings suspended from the rollers of saddle outer periphery can move thereabout to improve the damping ability of the string surface against the vibration on a striking of a ball.
Another object of the present invention is to provide an attachment for a tennis racket which attachment is replaceable and can be adapted as a balance weight to the frame. So that the racket may be durable and feasible.
The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.
REFERENCES:
patent: 240183 (1881-04-01), Richardson
patent: 2206548 (1940-07-01), Goerke
patent: 4057249 (1977-11-01), Reedhead et al.
patent: 4203597 (1980-05-01), Reedhead et al.
patent: 4441712 (1984-04-01), Guthke
patent: 4681319 (1987-07-01), Zilinskas
patent: 4765621 (1988-08-01), Game
patent: 5054779 (1991-10-01), Marrello
patent: 3714571 (1988-12-01), None
patent: 4100081 (1992-07-01), None
patent: 2587903 (1987-04-01), None
patent: 5358 (1889-01-01), None
patent: 4305 (1914-01-01), None
patent: 2267220 (1993-12-01), None
patent: 80/01757 (1980-09-01), None
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