Information
-
Patent Grant
-
6319160
-
Patent Number
6,319,160
-
Date Filed
Wednesday, September 13, 200024 years ago
-
Date Issued
Tuesday, November 20, 200123 years ago
-
CPC
-
US Classifications
Field of Search
US
- 473 539
- 473 540
- 473 541
- 473 543
- 473 524
- 473 534
- 473 537
- 473 522
-
International Classifications
-
Abstract
An attachment for a tennis racket is provided. The attachment has a curvature capable of engaging with a U-shaped groove of the frame of the racket, a pair of first and second lateral walls connected by two end portions without a bottom, a plurality of shafts disposed spaced apart in the attachment and connected at their two ends to the inner surfaces of the lateral walls, a plurality of rollers of saddle outer periphery rotatably engaged on the shafts on pair by pair basis and a plurality of partition posts projected transversely from the inner surface of the first lateral wall and positioned spaced apart between each pair of the rollers. A string comes in and out of the string holes in the groove and suspends from each pair of the rollers.
Description
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.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1
to
4
show a tennis racket according to a prior art,
FIG. 5
is an elevational view to show a tennis racket of the preferred embodiment according to the present invention,
FIG. 6
is an exploded perspective view to show an attachment engageable with a frame of the racket,
FIG. 7
is a perspective view to show an attachment in the frame suspended from a series of strings,
FIG. 8
is a sectional view of
FIG. 7
,
FIG. 9
is a sectional view to show a vertical position of the attachment,
FIG. 10
is a plane and partially perspective view to show a horizontal position of the attachment,
FIG. 11
is a plane view to show a racket head being unused,
FIG. 12
is a sectional view to show the string surface of the racket under a striking, and
FIG. 13
shows the string surface of the racket against a tennis ball on a striking.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to
FIGS. 5
to
7
of the drawings, the attachment for a tennis racket of the present invention comprises generally a racket
20
having a head and a handle (not shown). The head has an oval frame
21
of U-shaped section, a groove
22
in the outer periphery and a plurality of string holes
23
formed spaced apart in the groove
22
for stringing the strings
24
to make a string surface
25
inside the frame
21
.
An attachment
30
of U-shaped section which has a curvature similar to that of the groove
22
, a pair of lateral walls
31
and
32
without a bottom and connected by two end portions between which are a plurality of shafts
352
for rotatably engaging with a plurality of rollers
35
. The rollers
35
each has a saddle outer periphery
351
and are positioned on pair by pair basis. Each pair of the rollers
35
suspend from a string
24
which comes in and out from the string holes
23
beside the pair of rollers
35
, and plurality of partition posts
34
projected transversely from the inner surface of the lateral wall
31
positioned between each pair of the rollers
35
.
When the attachments
30
are engaged within the groove
22
of the frame
21
, each pair of the rollers
35
should be positioned between each pair of adjacent string holes
23
. So that a string surface can be made and strings
24
may be able to suspend from each pair of the rollers
35
(as shown in
FIGS. 7
,
8
,
9
,
10
and
11
).
Referring to
FIGS. 12 and 13
when the racket is unused, the string surface
25
is in a proper tension. When under a striking, the strings
24
move about the saddle outer periphery
351
of the roller
35
to dampen the vibration which a big proportion will remain in the strings
24
and the rollers
35
without transferring to the handle of the racket.
Further, the attachment
30
of the present invention is replaceable to keep the durability of the racket and can be made in different weight to balance the weight of the racket.
The specification relating to the above embodiment should be construed as exemplary rather than as limitative of the present invention, with many variations and modifications being readily attainable by a person of average skill in the art without departing from the sprit or scope thereof as defined by the appended claims and their legal equivalents,
Claims
- 1. A tennis racket with paired rollers comprising:a tennis racket comprising an oval head and a handle, said head including a frame of U-shaped section, a groove formed in outer periphery of the frame and a pluralilty of string holes formed spaced apart in a bottom of the groove; an attachment engaged with the groove of the frame having a curvature similar to that of the groove, a pair of first and second lateral wall connected by two end portions without a bottom, a plurality of shaft spacedly disposed in the attachment and connected at their two ends to the inner surfaces of the first and second lateral walls, a plurality of rollers rotatably engaged on the shafts and positioned on pair by pair basis and a plurality of partition posts projected spaced apart from the inner wall of the first lateral wall and positioned between each pair of the rollers; a string coming in and out of the string holes and suspended from each pair of the rollers; whereby a string surface is made inside said frame.
- 2. A tennis racket as recited in claim 1 wherein said roller each has a saddle outer periphery.
- 3. A tennis racket as recited in claim 1 wherein said attachment can be made in different weight.
US Referenced Citations (8)
Foreign Referenced Citations (7)
Number |
Date |
Country |
3714571 |
Dec 1988 |
DE |
4100081 |
Jul 1992 |
DE |
2587903 |
Apr 1987 |
FR |
5358 |
Jan 1889 |
GB |
4305 |
Jan 1914 |
GB |
2267220 |
Dec 1993 |
GB |
8001757 |
Sep 1980 |
WO |