U.S. patent number 3,582,081 [Application Number 04/852,960] was granted by the patent office on 1971-06-01 for golf club with adjustable weights and recessed face plate.
This patent grant is currently assigned to AMF Incorporated. Invention is credited to David Morton Caplan.
United States Patent |
3,582,081 |
Caplan |
June 1, 1971 |
GOLF CLUB WITH ADJUSTABLE WEIGHTS AND RECESSED FACE PLATE
Abstract
A golf club comprising a core having a sole plate register hole
formed on the bottom portion thereof, a hosel hole formed on a side
portion thereof and a cutaway section on the face portion thereof
forming a rear face, a rear face plate mounted within the cutaway
portion, said rear faceplate including a base portion and a
projecting portion consisting of two sidewalls and an apertured
center portion extending outwardly from the base portion, a weight
mounted within the sole plate register hole, a sole plate mounted
to the bottom portion of the core, said sole plate having an
apertured projecting portion extending outwardly therefrom to
engage the sole plate register hole, a predetermined swing weight
mounted within the apertured portion of the sole plate, and a shaft
having one end portion mounted within the hosel hole in the
core.
Inventors: |
Caplan; David Morton (Los
Angeles, CA) |
Assignee: |
AMF Incorporated (N/A)
|
Family
ID: |
25314658 |
Appl.
No.: |
04/852,960 |
Filed: |
July 18, 1969 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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602691 |
Dec 19, 1966 |
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Current U.S.
Class: |
473/338;
273/DIG.3; 273/DIG.16; 273/DIG.1; 273/DIG.8 |
Current CPC
Class: |
A63B
53/04 (20130101); A63B 60/00 (20151001); A63B
53/0466 (20130101); A63B 53/0425 (20200801); Y10S
273/03 (20130101); A63B 53/0433 (20200801); Y10S
273/08 (20130101); Y10S 273/01 (20130101); A63B
53/0441 (20200801); A63B 53/0458 (20200801); Y10S
273/16 (20130101); A63B 53/0416 (20200801) |
Current International
Class: |
A63B
53/04 (20060101); A63b 053/04 (); A63b
053/08 () |
Field of
Search: |
;273/169,171,173 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Oechsle; Anton O.
Assistant Examiner: Shapiro; Paul E.
Parent Case Text
This application is a continuation of application, Ser. No. 602,691
filed Dec. 19, 1966 and now abandoned.
Claims
I claim:
1. A golf club comprising:
a core having a sole plate register hole formed on the bottom
portion thereof, a hosel hole formed on a side portion thereof and
a cutaway section on the face portion thereof forming a rear face
and a pair of opposed sidewalls,
a rear face plate mounted within the cutaway portion, said rear
face plate including a base portion and a projecting portion
extending outwardly therefrom,
a weight mounted within the sole plate register hole,
a sole plate mounted to the bottom portion of the core, said sole
plate having an apertured projecting portion extending outwardly
therefrom to engage the sole plate register hole,
a predetermined swing weight mounted within the apertured portion
of the sole plate,
a shaft having one end portion mounted within the hosel hole in the
core, and
a plastic envelope surrounding the exposed core except for the face
portion and filling the cutaway section to provide a striking face
for the club in conjunction with the face portion of the core and
the projecting portion of the rear face plate, wherein:
the rear face plate comprises a base portion having a plurality of
apertures extending therethrough, a pair of sidewalls which engage
the walls of the cutaway core portion said projecting portion
extending outwardly from the base portion and having an aperture
extending therethrough, and further including:
a plastic material positioned within the aperture in the projecting
portion of the face plate and bonding to the rear face of the
core.
2. A golf club comprising:
a core having a cutaway face portion,
a face plate mounted within the cutaway face portion,
a sole plate mounted to the bottom portion of the core,
means mounted to the core to provide a predetermined swing
weight,
a shaft mounted to the core at one end thereof, and
an outer plastic layer surrounding the core and filling the cutaway
portion to provide a durable surface for the club, wherein:
the core includes at least two apertures formed therein and a face
portion comprising an end-grain wood surface,
the face plate comprises a base member mounted to the rear face of
the cutaway portion, a pair of arms extending outwardly from the
base member, and an intermediate member extending outwardly from
the base and having an aperture extending therethrough, and
the sole plate includes an aperture extending therethrough in
alignment with one of the apertures in the core and a plurality of
projecting members which abut against the core.
3. A golf club in accordance with claim 2 wherein:
the means mounted to the core to provide a predetermined swing
weight comprises a weight mounted within the aperture in the core
in alignment with the sole plate hole and a removable weight
mounted in engagement with the sole plate hole to provide a sole
plate adjustment, and
the outer plastic layer comprises a thermoplastic resin.
Description
This invention relates to golf equipment and particularly to a new
and improved golf club and the method of making said club.
The club head of a conventional "wood" or "driver" comprises a
suitably shaped laminated or solid wood block having a face insert
mounted thereto and a sole plate mounted on the bottom portion
thereof. A metal shaft is then secured within a reamed hole in the
hosel portion of the head and pinned through the head. The golf
club head is then finished in a number of separate steps by the
application of a variety of sealing agents, paints, lacquers, and
waxes. Further assembly steps include the addition of the swing
weight, the application of a wound thread or one-piece ferrule at
the neck of the head and the provision of a suitable grip on the
upper end of the shaft.
The foregoing conventional club requires considerable handwork to
exacting dimensional requirements. Furthermore, the manufacture of
the club necessitates a great number of separate operations with a
corresponding increase in labor costs. The typical club is, in
essence, a hand-crafted product with the quality variances and high
unit costs attendant upon such products. It is also extremely
difficult because of the multiplicity of hand sanding and finishing
operations to duplicate performance characteristics in the finished
golf clubs.
Solid clubs molded from synthetic resins have been produced
commercially, but by preferred standards of golf club performance
they have not been satisfactory. Major disadvantages of this
construction are that they do not produce the desired sound on
impact, and its dynamic characteristics, particularly in terms of
driving distance, are not as good as those of a conventional wood
club.
In the prior art, and particularly in U.S. Pat. application, Ser.
No. 441,519 filed Mar. 22, 1965 and assigned to applicant's
assignee, now U.S. Pat. No. 3,390,881, it has been proposed to
manufacture a golf club having a wood core and a plastic shell
mounted thereabout. The present invention, however, while having a
plastic encased wood core, represents a distant improvement over
the prior art both in structure and method of manufacture. The
unique golf club of the present invention is highly resistant to
moisture, maintains a predetermined swing weight and will neither
swell nor change its shape over a period of time. Also, the new
club uses the full end grain of the wood as the driving surface of
the club, thereby enabling better transmission of the swing energy
into impact against the ball.
Accordingly, it is an object of this invention to provide a new and
improved golf club.
Another object of this invention is to provide a superior golf club
at a lower cost.
A further object of this invention is to provide a golf club having
superior characteristics and appearance and in particular having an
outer surface which is resistant to wear.
A still further object of this invention is to provide a new type
golf club having a wood core enclosed within a plastic shell, said
club also including a face insert and sole plate assembled thereto
to produce a novel golf club construction.
A more specific object of this invention is to provide a new type
of golf club in which all vital components -- core, shaft, sole
plate, striking face, and weight are completely assembled in
correct relationship to each other before being enclosed in a
plastic shell.
With the above and other objects and advantages in view, the
present invention relates to a new and improved golf club which
includes a suitably shaped wood core having a sole plate register
hole and a hosel hole formed therein, and a cutaway section or
notch on the face portion thereof. A rear face plate having a
projecting portion including an aperture extending therethrough is
mounted within the face notch and bonded to the wood core by an
epoxy compound. The epoxy can also be used to fill the aperture and
flowing therethrough bond to the core face. A predetermined amount
of lead is positioned within the sole plate hole and the sole plate
is mounted to the bottom of the core. A shaft which may have a
dimpled end portion is bonded within the hosel hole. The assembly
is surrounded by a plastic shell and then subjected to a plurality
of finishing operations.
The method of manufacturing the above golf club comprises basically
the steps of forming a wood core on an automatic core lathe and
then drilling the sole plate register hole and the shaft hole. A
face notch is then cut in the face portion of the core. A
predetermined amount of lead is added to the insert and pounded
therein. After the sole plate holes have been drilled, the rear
face plate is mounted within the notch. The aperture or "eye" of
the projecting face plate portion is filled with epoxy in order to
bond the plate to the core face, or the "eye" can be filled with
plastic simultaneous with the encasing of the core assembly with an
auxiliary gate and runner so provided and adjusted that the plastic
completes the filling of the "eye" just as the exterior of the
"eye" is encased in plastic. By this method the interior pressure
matches the exterior pressure and the "eye" shape is not distorted.
The sole plate and associated plug are then mounted to the bottom
of the core. The shaft is sandblasted and then inserted and bonded
within the hosel hole. The club assembly is then positioned within
a mold and surrounded with an injection molded coating of plastic.
After molding, the head is cut and scored with a predetermined
spherical radius. The club is then finished by a procedure which
includes removing mold marks, labeling, stamping the serial number
on the hosel and coating with a tough durable coating of
polyurethane.
Other objects and advantages of the invention will become more
apparent from the following detailed description when read in
conjunction with the accompanying drawings wherein:
FIG. 1 illustrates the new improved golf club produced by the
method of the present invention;
FIG. 2 illustrates the subject golf club with portions removed to
illustrate the construction thereof;
FIG. 3 is a sectional view taken along the line 3-3 of FIG. 1.
FIGS. 4--16 illustrate in sequence the method of manufacturing the
subject golf club wherein:
FIG. 4 illustrates the wood core which is formed by an automatic
lathe turning apparatus;
FIG. 5 shows the completed wood core;
FIG. 6 shows the wood core with the sole plate hole and shaft hole
drilled therein;
FIG. 7 illustrates the wood core after the face notch has been
formed therein;
FIG. 8 shows the wood core with a lead weight inserted in the sole
plate register hole;
FIG. 9 shows the wood core with the mounting holes for the sole
plate drilled therein;
FIG. 10 is an exploded view showing the mounting of the rear
striking face to the wood core;
FIG. 11 shows the striking face mounted to the core and an epoxy
compound filling the eye of the striking face;
FIG. 12 is an exploded view showing the mounting of the sole plate
to the bottom portion of the wood core;
FIG. 13 is a side view showing the sole plate assembled to the wood
core and a swing weight in threaded engagement with the aperture in
the sole plate;
FIG. 14 shows the shaft being mounted to the wood core;
FIG. 15 shows the subject golf club after molding; and
FIG. 16 shows the finished golf club.
Referring now to the drawings, the invention comprises a new and
unique golf club 10 which includes a wood core 11 such as a hard
eastern maple. The core 11 is machined to include a sole plate
register hole 12 on the bottom portion 13 thereof and a cutaway
portion or notch 14 on the face portion 16 thereof. A rear face
plate 17 having a base portion 18, a pair of sidewalls 19 which
engage the walls 21 of the notch 14 and a projecting portion 22
including an aperture 23 extending therethrough is mounted within
the face notch 14. The aperture 23 in the projecting portion or
"eye" 22 is filled with epoxy which bonds to the rear face 24 of
the notch 14.
The club 10 also includes a lead weight 26 which is inserted or
poured into the hole 12 and forced into the undercut portion 27. A
sole plate 28 having a plurality of mounting apertures 29 and a
threaded hole 31 is mounted by means of screws 32 to the core 11.
The sole plate outer edges 33 and 34 are shaped to the contour of
the respective front and rear edges of the bottom portion of the
club 10 while the projecting portions 35 and 36 surrounding the
corresponding apertures 29 are designed to provide a support for
the mounting elements or screws 32 and to aid in anchoring the sole
plate 28 within the plastic envelope 37. The front projecting
portions 35 include enlarged flat forward faces 38 to resist the
club impact and to increase the surface area in contact with the
core 11 to facilitate the molding operation. Additional members 39
project at predetermined intervals from the sole plate 28 to aid in
achieving a permanent bond with the outer plastic surface 37 and to
prevent the molding pressure from forcing the spacer collars into
the core 11. The threaded aperture 31 includes a cylindrical wall
41 which engages the sole plate register hole 12 and is designed to
receive a predetermined adjustable swing weight plug 42. The plug
42 may be selected to provide the desired swing weight in
combination with weight 26 without removing the sole plate as
required in conventional woods.
A shaft 43 having an end portion 44 with a plurality of depressions
or dimples 46 is bonded within the shaft hole 47. The club head is
encased within an injection molded envelope 37 of a plastic or
thermoplastic resin material such as the
acrylonitrile-butadiene-styrene polymers. The resultant club 10 is
highly resistant to moisture and hence will neither swell nor
change its weight. As further advantages, the hosels will not crack
as in clubs of the prior art and sole plate slippage is eliminated.
Thus, the present invention involves new and improved golf club 10
which retains its solid, lively performance under the toughest
playing conditions.
The subject golf club 10 is produced by a unique process which
results in a virtually moisture proof and totally balanced club.
The construction process guarantees uniformity of size, shape and
weight in order to provide the balance and feel for consistent
accuracy and power.
The method of manufacturing the golf club 10 is illustrated
sequentially in FIGS. 4--16. FIG. 4 depicts the start of the
manufacturing process wherein a wood core 11 (FIG. 5) is formed
from 6 to 14 foot sections 48 of approximately two-by-fours on an
automatic wood lathe. The cutting tool follows a template as it
shapes the wood section 48 and then cuts the finished turned core
11. The lathe (not shown) then automatically indexes and feeds the
wood section 48 forward for another forming operation. Since there
is no hosel in the present design, it is possible to use a better
wood such as kiln dry hard maple and to employ a direct end grain
for the percussion face 16. The end grain provides superior
striking power and better sealing through the head as the plastic
envelope 37 is applied thereover.
The wood core 11 is fed to a drilling apparatus where the hosel or
shaft hole 47 and the sole plate register and lead receiver hole 12
are drilled simultaneously, see FIG. 6. The lead hole 12 is also
undercut for better lead hold. The face notch 14 is then milled in
the core face 16 in a conventional manner. As shown in FIG. 8, a
predetermined amount of lead 26 is inserted or cast into the hole
12 and "pounded" to fill the hole well and expand the lead 26 into
the undercut 27. Next, the sole plate holes 49 are drilled using a
drill jig.
The rear face plate 17 is mounted within the notch 14 by means of
screws 50 while a matching color epoxy is used to bond the
sidewalls 19 to the respective walls 21 of the notch 14. The rear
face plate 17 may be composed of either metal or an
acrylonitrile-butadiene-styrene-polycarbonate blend which provides
a high impact and tensile strength, and readily bonds to the
plastics envelope 37. The plate 17 also includes a pair of channels
51 which fill with plastic during the injection molding operation
to provide a locking arrangement.
The aperture 23 within the "eye" is filled with epoxy 25 which
bonds to the wood core 11 through the rear portion of the aperture
23. The insert 17 is then shaped to the exterior wood profile where
necessary in order to produce the assembly depicted in FIG. 11. In
another embodiment the aperture 23 is filled with plastic during
the molding operation and a separate step is thereby
eliminated.
As illustrated in FIG. 12, a die cast sole plate 28 is mounted to
the bottom portion 13 of the core 11 by means of screws 32. The
sole plate 28 conforms to the finished contour of the club bottom
and is spaced a predetermined distance from the core surface by the
bosses 35, 36 and 39. This provides a locking space for the plastic
during the molding operation and prevents sole plate slippage in
the finished club 10.
A shaft 43 having a sandblasted end portion 44 for better adhesion
is inserted in the hole 47 and bonded to the core 11 by means of an
epoxy binder. The detents 46 aid in anchoring the shaft 43 within
the hole 47 and within the plastic envelope 37 thereby eliminating
the need for a conventional pin arrangement. Furthermore, the
present shaft design prevents the hosel breakage which formerly
occurred.
FIG. 13 shows the sole plate 28 assembled to the core 11 and the
sole plate plug 42 which is mounted in threaded engagement within
the aperture 31. The sole plate plug 31 is removable to permit
swing weight changes, by adding to or removing lead in combination
with weight 26. Thus, it is possible to custom fit the club
characteristics to a particular individual.
FIG. 15 illustrates the club 10 after it has been removed from the
mold after an injection molding operation. The club 10 is
surrounded with a tough durable layer of material such as that sold
under the trademark "Cycolac" by the Marbon Chemical Division of
The Borg-Warner Company. The club head 52 and shaft 42 are located
precisely within the mold to obtain the desired configuration and
then the club illustrated in FIG. 15 is cut and scored to provide
the finished contour. The striking faces 16 and the "eye" 22 are
cut along a predetermined face angle while the plastic and wood
surface is rounded with a spherical radius of approximately 91/2
inches.
The club 10 is then rough sanded on a belt and finished in a number
of separate operations which include fine-sanding the head, filling
the scoring, labeling, hosel stamping and spraying. The finished
head 52 is sprayed with several coats of a material such as
polyurethane and buffed to provide an attractive appearance. A wood
sealant may be applied to the wood faces 16 prior to spraying.
The new and improved club 10 thus produced is totally balanced and
completely uniform in size, shape and weight. The club 10 is
superior in performance and endurance and is more reasonable to
produce due to the elimination of a plurality of separate hand
operations.
It is to be understood that the above-described arrangements are
simply illustrative examples of the application of the principles
of the invention. Numerous other arrangements may be readily
devised by those skilled in the art which will embody the
principles of the invention and fall within the spirit and scope
thereof.
* * * * *