Badminton racket

A badminton racket comprises a head, a shaft, and a hand grip. The hand grip is provided axially with a receiving hole of an appropriate depth for fastening the shaft with the hand grip. The receiving hole is provided at the bottom thereof with a conical portion becoming gradually smaller in dimension toward the upper end thereof from the lower end thereof. The hand grip is further provided axially with an elongate through hole extending from the upper end of the conical portion through the lower end wall of the hand grip. The adhesive coated on the inner wall of the receiving hole of the hand grip can not be therefore forced out by the shaft being inserted into the receiving hole of the hand grip during the process of fastening the shaft and the hand grip together.

BACKGROUND OF THE INVENTION 
The present invention relates generally to a badminton racket, and more 
particularly to the improved shaft and hand grip of the badminton racket. 
As shown in FIGS. 1 and 2, a badminton racket 10 of the prior art comprises 
a head 11, a shaft 12 and a hand grip 13. The head 11 is provided with a 
strung surface for hitting a shuttlecock. The shaft 12 is fastened at the 
upper end thereof with the lower end of the head 11. The shaft 12 has a 
lower end that is fastened with a receiving hole 131 disposed axially in 
the hand grip 13. 
The shortcomings inherent in the prior art badminton racket 10 described 
above are described hereinafter. 
In the process of fastening the shaft 12 with the hand grip 13, the inner 
wall surface of the receiving hole 131 of the hand grip 13 is first coated 
with an adhesive, such as a heavy duty glue, the shaft hole 131 in the 
direction indicated by an arrow 14 as shown in FIG. 1. The shaft 12 has an 
outer diameter which is only slightly smaller than the diameter of the 
receiving hole 131. As a result, some of the coated adhesive in the 
receiving hole 131 of the hand grip 13 is often forced out of the 
receiving hole 131 by the air pressure in the midst of the process of 
inserting the shaft 12 into the receiving hole 131 of the hand grip 13. An 
additional work is called for to clean up the messy hand grip 13. In 
addition, such a prior art method of fastening the shaft 12 and the hand 
grip 13 can only be characterized as inefficient in view of the fact that 
the method is time consuming and that some of the coated adhesive in the 
receiving hole 131 is squeezed out, thereby undermining the fastening 
effect. 
SUMMARY OF THE INVENTION 
It is, therefore, the primary objective of the present invention to provide 
a badminton racket with a shaft and a hand grip, which are fastened 
together in such a way that the adhesive coated on the inner wall of the 
receiving hole of the hand grip is not squeezed out at the time when the 
process of inserting the shaft into the receiving hole of the hand grip is 
under way. As a result, the fastening effect of the coated adhesive in the 
receiving hole of the hand grip is not undermined. 
In keeping with the principle of the present invention, the foregoing 
objective of the present invention is achieved by a badminton racket 
comprising a head, a shaft and a hand grip. The hand grip is provided 
axially with a receiving hole of an appropriate depth for fastening the 
hand grip and the shaft. The receiving hole is provided at the bottom 
thereof with a conical portion becoming gradually smaller in dimension 
toward the top thereof from the bottom thereof. The hand grip is further 
provided axially with an elongate through hole extending form the top of 
the conical portion through the bottom wall of the hand grip. The adhesive 
coated on the inner wall of the receiving hole of the hand grip can not be 
therefore squeezed out by the shaft being inserted into the receiving hole 
of the hand grip.

DETAILED DESCRIPTION OF THE INVENTION 
Referring to FIGS. 3 and 4, a badminton racket of the present invention is 
shown to comprise a head 20, a shaft 30, and a hand grip 40. 
The head 20 has a strung surface 21 for hitting the shuttlecock. The shaft 
30 of aluminium has an upper end that is fastened to the lower end of the 
head 20. The hand grip 40 is made of a material having an appropriate 
elasticity. The hand grip 40 embodied in the present invention is made of 
a plastic material. The hand grip 40 is provided axially with a receiving 
hole 41 extending from the upper end thereof. The receiving hole 41 of a 
predetermined depth is provided on the bottom wall thereof with a conical 
portion 42. The hand grip 40 is further provided axially with an elongate 
through hole 43 extending from the upper end of the conical portion 42 
through the lower end wall 44 of the hand grip 40. The receiving hole 41 
is provided axially on the inner wall thereof with a plurality of recessed 
strips 45 spaced at a predetermined interval. 
In the process of fastening the shaft 30 with the hand grip 40, the inner 
wall of the receiving hole 41 is first coated with an appropriate quantity 
of adhesive before the lower end of the shaft 30 is inserted into the 
receiving hole 41. As the shaft 30 is slowly inserted in the direction 
indicated by an arrow A as shown in FIG. 3 into the receiving hole 41, the 
air in the receiving hole 41 is forced out via the elongate through hole 
43, as illustrated by an arrow 50 in FIG. 5. As a result, the coated 
adhesive of the receiving hole 41 will not be squeezed out through the 
upper end opening of the receiving hole 41. In other words, all the coated 
adhesive remains inside the receiving hole 41 so that the shaft 30 is 
adhered securely to the inner wall of the receiving hole 41 of the hand 
grip 40. The construction of the conical portion 42 is such that it 
becomes gradually smaller in dimension from the lower end thereof toward 
the upper end thereof, so as to ensure that the coated adhesive in the 
receiving hole 41 is prevented from being forced into the elongate through 
hole 43. The recessed strips 45 of the receiving hole 41 serve to enhance 
torsional strength of the shaft 30 and the hand grip 40. The hand grip 40 
is provided at the lower end thereof with a cap 60. 
The embodiment of the present invention described above is to be regarded 
in all respects as merely illustrative and not restrictive. Accordingly, 
the present invention may be embodied in other specific forms without 
deviating from the spirit thereof. The present invention is therefore to 
be limited only by the scope of the following appended claim.