U.S. patent application number 11/455787 was filed with the patent office on 2007-12-20 for back recess balance weight structure for golf club heads.
This patent application is currently assigned to Shanghai Precision Technology Corporation. Invention is credited to Chien-Chi Lai, Li-Yang Lai.
Application Number | 20070293343 11/455787 |
Document ID | / |
Family ID | 38862267 |
Filed Date | 2007-12-20 |
United States Patent
Application |
20070293343 |
Kind Code |
A1 |
Lai; Li-Yang ; et
al. |
December 20, 2007 |
Back recess balance weight structure for golf club heads
Abstract
A back recess balance weight structure for golf club heads is
located on a back side of a golf club head relative to the striking
face and includes a back recess body and a sealing cap. The back
recess body has a back recess with a plurality of cavities formed
therein. The sealing cap covers the back recess by bonding. The
structure consists of simple elements. The sealing cap is made from
a material of a smaller specific gravity to move the weight of the
club head to the optimal position. The adhesive can absorb shock
and vibration to form a tight sealing of the sealing cap and the
back recess body. Thereby optimal stability and striking accuracy
can be achieved during swinging of the golf club.
Inventors: |
Lai; Li-Yang; (Kaohsiung
City, TW) ; Lai; Chien-Chi; (Kaohsiung City,
TW) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
Shanghai Precision Technology
Corporation
|
Family ID: |
38862267 |
Appl. No.: |
11/455787 |
Filed: |
June 20, 2006 |
Current U.S.
Class: |
473/332 ;
473/334; 473/345; 473/350 |
Current CPC
Class: |
A63B 2053/0491 20130101;
A63B 2209/00 20130101; A63B 60/02 20151001; A63B 53/0416 20200801;
A63B 53/0475 20130101; A63B 53/047 20130101; A63B 2209/02 20130101;
A63B 60/54 20151001 |
Class at
Publication: |
473/332 ;
473/334; 473/345; 473/350 |
International
Class: |
A63B 53/00 20060101
A63B053/00 |
Claims
1. A back recess balance weight structure for golf club heads being
located on a back side of a golf club head relative to a striking
face thereof, comprising at least: a back recess body which is
located on the back side relative to the striking face and has a
back recess, the back recess having a plurality of cavities; and a
sealing cap covering the back recess by bonding through an adhesive
to couple with the back recess body in an integrated manner.
2. The back recess balance weight structure of claim 1, wherein the
back recess is formed in a desired profile and located on a desired
location.
3. The back recess balance weight structure of claim 1, wherein the
number and location of the cavities are formed as required in the
back recess.
4. The back recess balance weight structure of claim 1, wherein the
sealing cap is made from a material selected from the group
consisting of aluminum, titanium and high strength fibers.
5. The back recess balance weight structure of claim 1, wherein the
adhesive is selected from the group consisting of Epoxy resin and
EPS blowing granules.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a back recess balance
weight structure for golf club heads and particularly to a back
recess balance weight structure that has a back recess on the back
side of the striking face of a golf club head with a plurality of
cavities formed thereon and covered by a sealing cap to reduce the
weight of the golf club head and move the balance weight to a
required location to shift the gravity center to an optimal
position to achieve accurate striking of the golf ball.
BACKGROUND OF THE INVENTION
[0002] Literature records show that golf was invented in England.
But in China a game called "Hammering ball" similar to the golf was
recorded before the Christian 'era. It is played by hitting a ball
with a wooden hammer into a goal. Where the golf was originated is
not important now. These days golf is a very popular sport, and
even seen as a high-esteemed sport of gentlemen and ladies in many
countries.
[0003] In the past Taiwan was an agricultural society and golf was
not a popular recreational activity. As the society progress
accelerates and quality of life advances, more and more people have
a higher demand on leisure activities. As a result golf becomes
more popular. Golf mainly is an individual sport. The golf club has
to suit each player according to the physical size and use habit of
the player. The design of golf club and club head is especially
important. As the swinging power and habit of the player varies
greatly, the balance weight of the club head affects the striking
result very much.
[0004] The conventional balance weight is mounted in a club head
after the striking face has been formed. To alter the balance
weight after the club head has been formed, the striking face and
the club head have to be disassembled. It takes a lot of time and
the integrity of the striking face could be damaged.
[0005] An approach has been proposed to improve the balance weight
of the golf club head by increasing the balance weight in another
direction on a surface opposite to the striking face. While such an
approach can meet user's requirement in some respect, the gravity
center still cannot be moved to a desired location to suit the
individual user. Swinging of the club also is not desirable. And
the stability and accuracy of club swinging decrease.
[0006] Refer to FIGS. 1 and 2 for a conventional golf club head 10.
It mainly has a head body 11, a striking face (not shown in the
drawings) and a balance weight structure 12. The balance weight
structure 12 is located on a back side of the head body 11. After
assembly of the golf club head 10 the balance weight structure 12
is fixed. As a result altering of the balance weight structure 12
is not easy, and adjusting the gravity center to the required
location is difficult.
SUMMARY OF THE INVENTION
[0007] The primary object of the present invention is to provide a
back recess balance weight structure for golf club heads that has a
simpler structure and a reduced head weight and can move the
balance weight to a required location to shift the gravity center
to an optimal position.
[0008] To achieve the foregoing object, the balance weight
structure of the invention is located on a back side of a golf club
head relative to the striking face. It has a back recess body and a
sealing cap. The back recess body contains a back recess with a
plurality of cavities formed thereon. The sealing cap is formed
with a profile mating the back recess to be coupled with the back
recess to form a sealing by bonding through adhesive.
[0009] The structure set forth above can achieve the following
functions:
[0010] 1. Striking of the ball is more accurate: As the balance
weight structure is located on the back side relative to the
striking face of the golf club head, and the back recess body has a
plurality of cavities formed in the back recess, the weight of the
club head is reduced and the balance weight can be moved to a
required location to shift the gravity center to an optimal
position. Therefore the accuracy of striking the golf ball can be
enhanced.
[0011] 2. Simpler structure: The balance weight consists of the
back recess body and the sealing cap. The gravity center of the
head can be shifted rearwards at the optimal position. As a result,
the stability balance and directional control of swinging of the
golf club can be improved.
[0012] The foregoing, as well as additional objects, features and
advantages of the invention will be more readily apparent from the
following detailed description, which proceeds with reference to
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is a perspective view of a conventional golf club
head.
[0014] FIG. 2 is an exploded view of a conventional golf club head
and a balance weight structure.
[0015] FIG. 3 is a rear exploded view of the present invention.
[0016] FIG. 4A is a rear perspective view of the present
invention.
[0017] FIG. 4B is a cross section taken on line 4B-4B in FIG.
4A.
[0018] FIG. 5 is a front perspective view of the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0019] Please refer to FIGS. 3 and 5, the back recess balance
weight structure for golf club heads according to the invention is
located on a back side of a golf club head 20 relative to a
striking face 25. It includes at least a back recess body 21 and a
sealing cap 24.
[0020] Refer to FIGS. 4A and 4B, the back recess body 21 is coupled
on a back side of the striking face 25 and has a back recess 22 in
which a plurality of cavities 23 are formed to reduce the weight of
the golf club head 20.
[0021] The sealing cap 24 is made from material of a smaller
specific gravity (such as aluminum, titanium, high strength fiber
material or the like). The sealing cap 24 is bonded to the back
recess 22 through adhesive to form a tight sealing.
[0022] The back recess 22 in the back recess body 21 can be formed
in any profile desired, such as various geometric shapes. An
embodiment of an elongate recess is shown in the drawings.
[0023] The sealing cap 24 can also be formed in any profile
desired, such as various geometric shapes. An embodiment shown in
the drawings is a profile mating the back recess 22.
[0024] The back recess 22 also has a plurality of cavities 23. The
number and locations of the cavities 23 are determined by the
weight of the club head 20 to be reduced and required moving
location of the balance weight. In an embodiment of the invention,
the cavities 23 are located on the back recess 22 to shift the
gravity center of the club head 20 to an optimal position.
[0025] The sealing cap 24 is bonded tightly to the back recess 22
through a shock-absorbing adhesive (such as epoxy resin or EPS
blowing granules) to reduce vibration during striking and absorb
vibration.
[0026] FIG. 3 illustrates a balance weight structure located on the
back side of the striking face 25 of the golf club head 20, with a
plurality of cavities 23 formed on the back recess 22 of the back
recess body 21. Such a structure can reduce the weight of the club
head and move the balance weight to the required location and shift
the gravity center to the optimal position. Referring to FIGS. 4A
and 4B, the sealing cap 24 is formed in a profile mating the back
recess 22 to cover and bond to the back recess 22 through adhesive
(such as Epoxy resin or EPS blowing granules) to form a tight
sealing. The shock-absorbing adhesive can reduce vibration during
swinging of the golf club. The weight and width of the bottom of
the club head 20 can also be increased to move the gravity center
rearwards to enhance the accuracy of striking.
[0027] In short, the balance weight structure of the invention is
located on the back side of the golf club head 20 relative to the
striking face 25 with a back recess 22 formed therein and a
plurality of cavities 23 formed in the back recess 22. The back
recess 22 further is covered by a sealing cap 24 of a smaller
specific gravity. The sealing cap 24 can be formed in any profile
desired to reduce the weight of the golf club head 20 and enhance
the aesthetic appeal and expand the sweet spot of the swinging
club. The back recess 22 and the sealing cap 24 are bonded tightly
by a shock-absorbing adhesive. Such a design allows the gravity
center to be shifted to the optimal position of the club head 20.
The width of the bottom of the club head 20 may also be increased
to move the gravity center rearwards to enhance the stability and
accuracy during swinging of the golf club.
* * * * *