U.S. patent number 3,761,095 [Application Number 05/217,393] was granted by the patent office on 1973-09-25 for golf club head with sole plate-keel attachment.
Invention is credited to Stanley C. Thompson.
United States Patent |
3,761,095 |
Thompson |
September 25, 1973 |
**Please see images for:
( Certificate of Correction ) ** |
GOLF CLUB HEAD WITH SOLE PLATE-KEEL ATTACHMENT
Abstract
A head for a golf club includes a wood body with a cutout in the
lower surface thereof for receiving a sole plate, having a
longitudinal keel with concave sides, to lower the center of
gravity, to provide minimum ground contact, to stabilize the line
of travel and to set up a favorable air flow along the bottom of
the head for separating the grass as the club is swung. The sole
plate may be provided with three upwardly opening cavities above
the keel into which plugs may be inserted during manufacture to
selectively vary the weight of the completed head. SP This is a
continuation of application Ser. No. 6,443, filed Jan. 28, 1970 and
now abandoned.
Inventors: |
Thompson; Stanley C. (Culver
City, CA) |
Family
ID: |
22810887 |
Appl.
No.: |
05/217,393 |
Filed: |
January 12, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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6443 |
Dec 28, 1970 |
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Current U.S.
Class: |
473/327; 473/328;
473/338 |
Current CPC
Class: |
A63B
53/0466 (20130101); A63B 53/04 (20130101); A63B
60/00 (20151001); A63B 53/0416 (20200801); A63B
2225/01 (20130101); A63B 53/0433 (20200801) |
Current International
Class: |
A63B
53/04 (20060101); A63b 053/04 () |
Field of
Search: |
;273/77R,78,8C,80.2,164,167-175 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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242,756 |
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Nov 1925 |
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GB |
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386,269 |
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Jan 1933 |
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GB |
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452,389 |
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Aug 1936 |
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GB |
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Primary Examiner: Pinkham; Richard C.
Assistant Examiner: Apley; Richard J.
Claims
I claim:
1. In combination with a golf club head comprising a non-metallic
body having a heel portion, a toe portion, a ball striking forward
face and a substantially flat underside containing a recess sunk
upwardly therein to extend laterally forwardly and intersect said
forward face, said face being longitudinally elongated between the
heel and toe portions of the club, the improvement comprising
a. a metallic insert received and fitted in the recess in
interlocking relation with the body,
b. the insert also having a ball striking forward face which
extends in co-planar relation with the body forward face to define
therewith a combination forward face which is upwardly and
rearwardly inclined, the insert increasing in longitudinal width
dimension toward forward wingtip portions of the insert closest the
toe and heel portions of the head, the insert front face having a
lower apex portion which is downwardly convexly rounded, said
combination forward face having lower edges which extend upwardly
and longitudinally oppositely in generally diverging relation from
said lower apex portion and respectively toward the toe and heel
portions of the head,
c. the insert having a downwardly facing keel extending from said
apex portion as a laterally rearwardly elongated extension thereof
whereby the keel is also downwardly convexly rounded along its
length, and
d. the insert having underside faces at longitudinally opposite
sides of the keel, each said underside face having downward
concavity which remains substantially the same throughout the
lateral length of said underside face and longitudinally blends
with said substantially flat underside of said body at said toe and
heel portions , said underside faces also extending forwardly
toward the insert front face and presenting forwardly rounding edge
portions merging with the upwardly diverging lower edges of the
insert front face.
Description
BACKGROUND OF THE INVENTION
This invention relates to golf clubs and more particularly to a
head for such clubs.
Golf clubs known as woods are used for hitting the ball off the
tee, from the fairway and possibly from the rough. The number 1
wood or driver has a straight or substantially vertical face and is
used primarily at the tee for straight ahead distance. The number 2
wood or brassie has a face slightly inclined from the vertical and
is used for hitting the ball from the fairway for distance with a
very little loft to only slightly raise the ball off the ground.
The number 3 wood or spoon has a face with a more incline and is
used for hitting the ball from the fairway for less distance but
with more loft to raise the ball possibly over a obstruction or
trap. The number 4 wood or cleek and the number 5 wood or baffy
continue this trend towards more loft and less distance as do the
number 6-10 woods which give so much loft as to be of little use on
the fairway and are therefore reserved for use in the rough where
the loft is needed to pick the ball out of the tall grass.
Normally the woods with the exception of a driver are used to hit
the ball from its location on the grass or ground in the fairway or
the rough. With conventional woods, the lower surface is flat to
engage the ground over its entire surface and thereby flattens the
grass while hitting the ball. It is well understood that to get the
most distance for a given effort in a golf shot, the golf club head
must have its maximum momentum just as the face of the golf club
head and the ball engage. However, the engagement of the ground and
the flattening of the grass by a conventional head slows the speed
of the head and lowers the momentum just at this critical time. Of
course this problem is greatest when the ball is lying in the
"rough" where high grass absorbs more of the momentum of the head
than is desirable.
Therefore it is an object of this invention to probide a novel golf
club head with a lower keel which gives a minimum of surface area
to engage the ground, and to hold the line of travel as the head
contacts the turf and which has concave sides to set up a favorable
air flow pattern over the lower surface to separate the blades of
grass.
Other and additional objects of this invention are to provide a
golf club head having a wooden body with a cutout for a sole plate
having such a keel, to provide such a head with such a sole plate
having a series of upwardly opening cavities over the keel to
lighten the head, and to provide such a head with a sole plate
having plugs in the upwardly opening cavities to selectively vary
the weight of the head.
SUMMARY OF THE INVENTION
The improved golf club head according to this invention for
attachment to a conventional shaft and grip to form an improved
golf club includes a body having a longitudinal keel downwardly
extending to provide a comparatively small lowermost surface area
for a minimum ground contact. The sides of the keel may be concave
to give a favorable air flow over the lower surface to separate the
grass. The body may have a cutout receiving a sole plate with the
keel and having upwardly opening cavities which may be filled with
plugs to vary the weight of the head.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevational view of a golfer swinging a golf club
having a golf club head according to this invention, mounted
thereon with the club being shown just prior to hitting a ball
lying in the rough.
FIG. 2 is a front elevational view on an enlarged scale of the golf
club head.
FIG. 3 is a bottom view taken along the plane III--III of FIG.
2
FIG. 4 is a sectional view taken along the plane IV--IV of FIG.
2.
FIG. 5 is an exploded perspective view of the sole plate and the
plugs therefor.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT:
Referring now to the drawings and particularly to FIG. 1, a golf
club head embodying the present invention is generally indicated at
10 and is shown secured to a shaft 11 having for example a number 4
wood shaft length for maximum swing arc and having a conventional
grip 12 to form an improved golf club 13. The club 13 is shown in
hands of an expert golfer 14, just as the head 10 is about to
engage the ball.
As best seen in FIG. 3, the golf club head 10 generally includes a
upwardly extending shaft receiving neck 15, a body 16, a sole plate
25.
The improved golf club head 10 is shown in the preferred embodiment
as being a "wood" and includes a wooden body 16 with a front face
17. The front face 17 may be of any incline to the vertical with an
exemplary incline being shown which would approximate that of a
number 7 wood. The front face 17 has a centrally located cutout 18
for a trapezoidal panel. The body 16 is bulged at 19 behind the
front face 17 as is conventional for a wood. The body 16 has a
lower surface 20 having a cutout 21 for receiving a sole plate 25.
The cutout 21 follows the shape of the sole plate 25 to be fitted
therein, and has centrally located opposed peninsulas 22 to locate
the sole plate 25 with respect to the body 16.
As best seen in FIG. 3, the sole plate 25 is shaped to mate with
cutout 21 in the lower surface 20 of the body 16. The sole plate 25
has a front face 26 which when the sole plate 25 is located in the
cutout 21, provides an extension of the front face 17 of the body
16. The front face 26 is relatively wide and the sole plate 25
extends rearwardly therefrom to narrow into a waist 27 before
spreading again at the rear end 28. The waist 27 mates with the
centrally located opposed peninsulas 22 to locate the sole plate 25
with respect to the body 16. The sole plate 25 is secured within
the cutout 21 in the lower surface 20 of the body 16 by epoxy to
bond the sole plate 25 and the body 16 together.
As seen in FIG. 1, the sole plate 25 has a major portion 29 of the
lower surface from which a longitudinal keel 30 protrudes
downwardly. In FIG. 3, the longitudinal keel 30 extends from
generally centrally from the front face 26 rearwardly along a line
that will be the path of swing of the front face of the golf club
head 10 on the golf club 13. The bottom of the keel 30, being
lowermost, contacts the ground before the ball is struck to space
the major portion 29 of the lower surface of the plate 25 and lower
surface 20 of the body 16. Thus the area of contact with the ground
is only the bottom of the keel 30.
The preferred embodiment has a keel 30 with concave sides 31. (See
FIG. 2). The concave sides 31 blend smoothly with the keel 30 and
the major portion 29 of the lower surface of plate 25. The purpose
of providing the concave sides 31 to the longitudinal keel 30 is to
set up a favorable air flow over the lower surfaces 29 and 30 of
the club head 10 as the club 13 is swung through the air. As the
head 10 passes through the air, the keel 30splits the air ahead of
the club head 10 and the concave sides 31 direct the air outwardly
as it passes over the lower surfaces 29 and 20. This pattern of air
flow tends to separate and bend the grass as the head 10 approaches
the ball (See FIG. 1) rather than crush the grass as the
conventional flat bottomed head does.
As seen in FIG. 3, the sole plate 25 is also provided with a recess
32 in the lower surface 29 in which can be inserted the golfer's
initials or a manufactured trademark.
The golf club head 10 is completed by the insertion of a
trapezoidal panel 35 in the cutout 18 on the front face 17 of the
body 16. The panel 35 is made of a plastic material which can
engage a ball repeatedly without becoming dented or worn as the
wood of the body 16 will become if such a panel 35 were not
provided.
As seen in FIG. 5, if a variation in the weight of the golf club
head 10 is desired, a series of cavities 33 may be drilled in the
upper surface 34 of the sole plate 25. Preferably the cavities 33
will be located along the axis of the keel 30 to permit greater
depth without opening to the major portion 29 of the lower surface
which for reasons of appearance should be smooth. In the preferred
embodiment shown, three such cavities 33 are provided.
Plugs 37 are provided for the cavities 33 in the upper surface 34
of the sole plate 25. These plugs 37 may be made of the same
material as the sole plate 25 and mate with the cavities 33 to
enable the manufacture of golf club head 10 with different weights.
If a light golf club head is desired, the plugs 37 are omitted
entirely, and if a heavy golf club head is desired all the plugs 37
are inserted in the cavities 33 with variations therebetween having
different numbers of plugs 37 in respective cavities 33.
As an example of the advantages to be gained by using the golf club
13 with the improved head 10 over a golf club with a conventional
flat bottomed head, consider the situation of a ball lie in the
"rough" having thick grass several inches high such as is shown in
FIG. 1. The ball is not resting on the ground but is supported by
the grass. Directly behind the ball, the grass stands generally
straight to obstruct the planned path of the head 10 to the ball.
As the golf club 13 is swung, the head 10 passing through the air
sets up the favorable air flow across the lower surface, as
explained earlier, to sweep the blades of grass toward the outside.
If the approach of the head 10 is not exact, the head 10 may engage
the growing prior to striking the ball. If the head 10 does engage
the ground, the keel 30 will act to space the major portion 29 of
the lower surface from the ground with the only engagement being
between the bottom of the keel 30 and the ground. The engagement of
the keel with the ground or the turf may help the golfer hold the
line of travel of the head. With the separation of the grass and
the minimum ground engagement, a minimum of head speed will be lost
thereby at the critical time prior to front face 35 of the head 10
striking the ball to deliver a greater momentum to the ball at
impact, for both distance and lift.
While the improved golf club head 10 in the preferred embodiment is
shown as being a "wood" the invention as disclosed is equally
applicable to other types of heads to give the described
advantages.
Thus, the improved golf club head according to this invention
provides a downwardly extending longitudinal keel with concave
sides for a minimum ground contact, for holding the line of travel
through the turf and for a favorable air flow over the lower
surface to reduce the loss of momentum of the head. The reduction
in the loss of momentum just prior to the ball being struck gives
greater distance and loft to the golf shot.
* * * * *