U.S. patent application number 11/889948 was filed with the patent office on 2008-02-21 for putter head having means for adjustment of the centre of gravity and weight.
Invention is credited to Donald Joseph Drew.
Application Number | 20080045354 11/889948 |
Document ID | / |
Family ID | 39102035 |
Filed Date | 2008-02-21 |
United States Patent
Application |
20080045354 |
Kind Code |
A1 |
Drew; Donald Joseph |
February 21, 2008 |
Putter head having means for adjustment of the centre of gravity
and weight
Abstract
The putter head is symmetrical about a plane and includes a toe
member having an elongated striking surface and a heel member which
extends to the rear of the toe member. In one embodiment of the
putter head, a cavity extends inward from a rear or upper wall of
the heel member. In another embodiment, a nut is attached to the
rear or upper wall of the heel member. Plugs of differing weights
are each adapted to be screwed into the cavity or into the central
opening of the nut.
Inventors: |
Drew; Donald Joseph;
(Oshawa, CA) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
39102035 |
Appl. No.: |
11/889948 |
Filed: |
August 17, 2007 |
Current U.S.
Class: |
473/337 ;
473/340 |
Current CPC
Class: |
A63B 53/007 20130101;
A63B 53/0487 20130101; A63B 2053/0491 20130101; A63B 60/02
20151001 |
Class at
Publication: |
473/337 ;
473/340 |
International
Class: |
A63B 53/06 20060101
A63B053/06 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 17, 2006 |
CA |
2,556,513 |
Claims
1. A putter head having means for adjusting the weight and centre
of gravity thereof, said putter head being symmetrical about a
first plane of symmetry and including: a toe member having an
elongated striking surface which lies in a second plane oriented
normal to said first plane of symmetry, a heel member extending to
the rear of said toe member and terminating at a rear surface, a
plurality of differing weights each being symmetrical about a
separate third plane of symmetry; and means for attachment of each
said weight to said head such that said first plane of symmetry and
said third plane of symmetry of said weight so attached are
co-planar.
2. In combination with the putter head of claim 1, a shaft for a
handle which extends upwardly from said head, said shaft having a
longitudinal axis which lies on said first plane of symmetry, said
axis being spaced apart from an imaginary parallel line which
intersects said second plane, said second plane being oriented such
that the angle between said second plane and said line is between 0
degree and about 3 degrees, said angle, when greater than 0 degree,
being downwardly opening.
3. The putter head of claim 1 wherein said toe member and heel
member have an upper surface, said attachment means including a
cavity formed in one of said rear surface and said upper surface,
said weights each adapted to be separately accommodated in said
cavity.
4. The putter head of claim 3 wherein said cavity is defined by a
threaded cylindrical inner wall and each said weight is cylindrical
and has a threaded outer wall for threadable mating with said inner
wall.
5. In combination with the putter head of claim 3, a shaft for a
handle which extends upwardly from said head, said shaft having a
longitudinal axis which lies on said first plane of symmetry, said
axis being spaced apart from an imaginary parallel line which
intersects said second plane, said second plane being oriented such
that the angle between said second plane and said line is between 0
degree and about 3 degrees, said angle, when greater than 0 degree,
being downwardly opening.
6. A putter head of claim 1 wherein said toe member and heel member
have an upper surface, said attachment means being disposed on one
of said rear surface and said upper surface and extending outwardly
therefrom, said weights being of differing weights and lengths and
each being adapted to be separately attached to said attachment
means.
7. The putter head of claim 6 wherein said attachment means has a
threaded opening and each said weight is cylindrical and has a
threaded outer wall for threadable mating with said threaded
opening.
8. In combination with the putter head of claim 6, a shaft for a
handle which extends upwardly from said head, said shaft having a
longitudinal axis, which lies on said first plane of symmetry, said
axis being spaced apart from an imaginary parallel line which
intersects said second plane, said second plane being oriented such
that the angle between said second plane and said line is between 0
degree and about 3 degrees, said angle, when greater than 0 degree,
being downwardly opening.
Description
FIELD OF THE INVENTION
[0001] This invention relates to golf clubs and more particularly
to the head of a golf putter having provision for altering the
overall weight and the distribution of the weight of the
putter.
BACKGROUND OF THE INVENTION
[0002] The weight of the head of a golf club and the location of
its centre of gravity are well known to affect a golfer's swing.
The weight of the head for example, affects the force of impact of
the swing which in turn affects the distance that a ball travels
assuming that the ball is hit squarely. The greater the force of
impact of the head at the time of impact with the ball, the longer
will be the length of a shot, again assuming that the ball is hit
squarely. The force of impact is governed by the strength of the
player and the weight of the head. For a given player the weight of
a head is the governing factor for obtaining the maximum possible
distance.
[0003] The weight and centre of gravity can be customized at the
time of manufacture of the golf head to take into account such
variables as the position of a golf club, the angle of swing of a
club, the length of the handle of the club and the particular
strength and ability of a golfer.
[0004] Some known golf clubs have provision for adjustment of the
weight and centre of gravity of their heads so that a golfer can
made adjustments between swings and, as needed, to take into
account any changes that may occur in his swing. An example of such
a golf club is described in U.S. Pat. No. 6,923,734 to Meyer where
the head of the club is provided with internal tubular passages for
receipt of weighted rods. The weight and centre of gravity of the
head can be adjusted by altering the position of the rods.
[0005] A shortcoming of the Meyer golf head is that it has a
complicated structure owing to its internal passages. As a result,
the manufacture of the head is time consuming and expensive. An
additional shortcoming is that adjustment in the position of the
weighted rods is not a simple matter. Adjustment requires a tools
and a significant amount of time.
[0006] SUMMARY OF THE INVENTION
[0007] I have invented a putter in which adjustments to the weight
and centre of gravity of its head can be made quickly and without
special tools. Moreover the head has a very simple structure and is
very economical to construct. Briefly the putter head of my
invention, is symmetrical about a plane of symmetry and includes a
toe member having an elongated striking surface oriented normal to
the plane of symmetry and to the direction in which the head is
adapted to swing. A heel member extends to the rear of the toe
member and terminates at a rear surface.
[0008] One embodiment of the putter of my invention has a cavity in
its rear surface or its upper surface. The cavity has a cylindrical
inner wall, the longitudinal axis of which coincides with the plane
of symmetry of the putter head. A number of differing weights is
each adapted to be accommodated in the cavity.
[0009] Another embodiment of my putter has provision for the
attachment or a number of differing weights to the outside surface
of the rear or upper surfaces of the putter head. Each weight is
symmetrical about a plane and that plane is co-planar to the plan
of symmetry of the putter head when the weight is attached to the
putter head.
DESCRIPTION OF THE DRAWINGS
[0010] The putter head of the invention is described with reference
to the drawings in which:
[0011] FIG. 1 is a perspective view of the front of the head of the
putter in conjunction with a shaft for a handle;
[0012] FIG. 2 is an elevation of the putter head and shaft;
[0013] FIG. 3 is a perspective view of the rear of the putter head
and shaft;
[0014] FIG. 4 is a plan view of the position of the golfer's feet
and the position of the putter head immediately prior to being
swung.
[0015] FIG. 5 is a perspective view of a second embodiment of the
putter head and shaft;
[0016] FIG. 6 is an enlarged perspective view of a third embodiment
of the heel member of the putter head.
[0017] Like reference characters refer to like parts throughout the
description of the drawings.
DESCRIPTION OF PREFERRED EMBODIMENTS
[0018] With reference to FIG. 1, the head of the putter, generally
10 includes a toe member 12 and a heel member 14 which extends from
the rear of the toe member. A shaft 20 of a handle extends upwardly
from the putter head.
[0019] The toe member has an elongated striking surface 22 on its
front wall. The surface is flat and lies on a plane 24. The upper
edge 22a of the striking surface is straight while the lower edge
22b has a flat central portion 22c and flat upwardly sloping side
edges 22d,e.
[0020] With reference to FIG. 2, the shaft has a longitudinal axis
20a-20a. That axis is parallel to and spaced apart from an
imaginary line 26 which, intersects plane 24 of the striking
surface. Plane 24 is oriented such that the angle 28 between that
plane and line 26 is between 0 degree and about 3 degrees. It will
be observed that when the angle is greater than 0 degree, the angle
is downwardly opening so that the lower edge 22b of the striking
surface is ahead of the upper edge 22a.
[0021] With reference to FIG. 3, the head of the putter is
symmetrical about a plane 30 referred to below as the "plane of
symmetry" of the head. The longitudinal axis 20-20 of the shaft
lies on that plane.
[0022] A cavity or passageway 34 extends downwardly into the body
of the heel member from its upper surface 36. The cavity is defined
by a cylindrical inner wall 38, the longitudinal axis 38a-38a of
which lies on the plane of symmetry 30 of the head.
[0023] Cavity 34 is adapted to receive a weight or plug 40. Threads
are formed on the outer wall of the plug for threadable mating with
the threads on the inside wall of the cavity.
[0024] With reference to FIG. 5, a cavity 44 is formed on the rear
wall 46 of the heel member. That cavity, like cavity 34, has a
threaded cylindrical inside wall in which a weight or plug 50 is
received. The longitudinal axis of the plug lies on the plane of
symmetry 30 of the head.
[0025] Both plugs 40, 50 can be rotated by means of an Allen key in
order to advance or retract the plug from the cavity.
[0026] With reference to FIG. 6, a nut or attachment means 60 is
attached by welding to the rear wall 46 of the heel member. The nut
has a central threaded opening for threadable receipt of a weight
or threaded plug 62 which extends to the rear of the heel member.
The longitudinal axis 62 of the plug lies on the plane of symmetry
30 of the head.
[0027] Nut 60 may also be welded to the upper surface 36 of the
heel member. It is located such that the longitudinal axis of the
plug when threadably advanced onto the nut lies on the plane of
symmetry 30 of the head.
[0028] The nut, being cylindrical, is symmetrical about a plane 66
which may be rotated 360 degrees. Plugs 40 and 50 are the same in
this respect. However the plugs need not be cylindrical; they may
be other shapes so long as they are symmetrical about a plane. That
plane, in relation to the plugs is referred to as the "third plane
of symmetry" in the claims. The plane of symmetry 30 of the head is
referred to as the "first plane of symmetry" while plane 24 of the
striking surface is referred to as the "second plane" in the
claims.
[0029] The plug be made of plastic but preferably is composed of a
heavier metallic material such as steel. Such material will add
significantly to the overall weight of the head.
[0030] The weight of the putter head can be adjusted to the
particular needs of a golfer by obvious means such as by increasing
or decreasing the length of the plug or by forming the plug of
lighter material such as nickel, copper and alloys of these metals.
Where a heavier head is required, the plug can be composed of lead
or alloys of lead.
[0031] The centre of gravity of the head can be adjusted simply by
rotating the plug to cause it to move further into or further out
of the cavity or further toward and away from the toe member in the
case where the plug is attached to the nut. Since the longitudinal
axis of the plug lies on the plane of symmetry of the head, such
movement of the plug will not affect the balance of the head.
[0032] It will be understood that plugs of different material and
lengths can be used to tailor the weight of the head to the
specific needs or wishes of an individual golfer.
[0033] FIG. 4 illustrates the golfer's stance immediately prior to
striking the golf ball. The golfer is striking from the left side
of his body and his left foot 70 is behind his right foot 72. The
head 74 of the putter is to the left of his left foot and the
golfer has twisted his body slightly counter-clockwise so that he
can grasp the handle of the putter with both hands. The golfer will
use his left hand to strike the ball 76 and his right hand to
steady the putter.
[0034] The position of the feet and the function of the hands will
be reversed should the golfer strike the ball from the right of his
body.
[0035] It will also be understood that other modifications can be
made in the structure of the putter head of the invention without
departing from the scope and purview of the invention as defined in
the appended claims.
* * * * *