Games using tangible projectile – Player held and powered – nonmechanical projector – per se,... – Racket or paddle; accessory therefor
Reexamination Certificate
2001-08-16
2002-08-27
Chiu, Raleigh W. (Department: 3711)
Games using tangible projectile
Player held and powered, nonmechanical projector, per se,...
Racket or paddle; accessory therefor
C473S539000
Reexamination Certificate
active
06440015
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a string fastener for a racket, particularly to one possible to protect the strings of the racket from cut off with their friction against a racket frame lessened.
A known conventional string fastener, as shown in
FIG. 7
, includes a racket frame
1
having a string fastener
2
closely fixed on its outer side. The string fastener
2
is provided with a plurality of short tubes
4
spaced apart around its inner wall and inserted in the racket frame
1
, with each tube
4
having a string hole
3
for a string to pass through. The string fastener
2
with the tubes
4
is formed integral by means of injection molding, and these tubes
4
are inserted in holes bored in the racket frame
1
, and then strings
5
are orderly inserted through these tubes
4
to be protected inside.
However, referring to
FIG. 6
, in the known conventional racket mentioned above, the strings
5
are made to pass through each tube
4
first and then bent tightly in a right angle and pass through another tube
4
and so on, with the strings
5
compressing every two adjacent tubes and pushing against their inner walls. Additionally, every hole of the racket frame
1
is formed into an acute-angled edge
6
, and after a string
5
is inserted through a tube
4
, it is bent tightly in a right angle to rest against the aforesaid acute-angled edge
6
of each hole and then passes through another tube
4
along the bottom of the string fastener
2
.
Thus, when the strings
5
are netted on a racket, the acute-angled edges
6
of the holes are liable to render the tube
4
broken by excessive force and even cut off the strings
5
.
Further, when a string
5
is inserted through the tube
4
, it leans closely on its inner wall A and then is bent in a right angle to rest against the aforesaid acute-angled edge
6
of each hole of the racket frame
1
and subsequently is pulled along the bottom of the string fastener
2
and passes through another tube
4
to push against its inner wall A. Under such condition, the contact area between each string
5
and the string fastener
2
is large and the friction of the string
5
on this contact area increases so that the string
5
is likely to be cut off by aforesaid friction.
SUMMARY OF THE INVENTION
The main objective of this invention is to offer a string fastener for a racket, possible to protect the strings of a racket from cut off and reduce the friction coefficient of the strings.
The feature of the invention is the string fastener having a plurality of tubes provided spaced apart equidistantly on its inner wall, with each tube having a string hole for a string to pass through and inserted in the racket frame. The string fastener has a U-shaped wall formed integral on upper portion, and the same number of string support members as the tubes are formed integral between two vertical inner surfaces of the U-shaped wall, with each support member for each string of a racket to rest thereon after inserted through the tubes .
Another objective is to offer a string fastener, which needs only to modify its structure, but with the structure of a racket frame unchanged.
REFERENCES:
patent: 4681319 (1987-07-01), Zilinskas
patent: 5762570 (1998-06-01), Shaw
patent: 6319160 (2001-11-01), Hsu
patent: 6336877 (2002-01-01), Arroyo et al.
patent: 2196537 (1988-05-01), None
Chiu Raleigh W.
Troxell Law Offices PLLC
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