|Publication number||US3888484 A|
|Publication date||Jun 10, 1975|
|Filing date||Dec 23, 1968|
|Priority date||Dec 23, 1968|
|Publication number||US 3888484 A, US 3888484A, US-A-3888484, US3888484 A, US3888484A|
|Inventors||Zitko Henry D|
|Original Assignee||Zitko Henry D|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (16), Referenced by (38), Classifications (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Zitko 1 1 June 10, 1975 [541 GOLF CLUB 3.448.981 6/1969 Anweiler 273/80 C 3.459.426 8/1969 Sherwood 273/164 X [761 lnvemo" Henry 33 Ave-i D149.156 3/1948 Weatherington 273 164 X Vancouver Bmlsh columblai 0183.180 7/1958 Phillips 273/164 0x Canada D186,522 1 1/1959 Schneider 273/164 X Filed: Dec. 1968 D196.736 10/1963 DcCarlo 273/164 } pp No: 785,894 FOREIGN PATENTS O11 APPLICATIONS 3.118 1908 United Kmgdom 273/80 899,562 6/1962 United Kingdom.....  0.5. CI 273/80 C; 273/813; 273/164; 255080 12/1964 Australia 273/167 O 3.118 2/1908 United Kingdom... 511 lm. c1 A63b 53/00 7271151 3/1955 United Kingdom 173/80 C [581 Field of Search 273/77 R, 81 R, 163 R, OTHER PUBLICATIONS 273/164,8:)6l781(')7; 2 "Schaums Outline Series: Theory of Engineering Me- /5 chanics Statics and Dynamics" by McLean and Nel- 1962, .232 d 233.  References Cited pp an UNITED STATES PATENTS Primary ExaminerRichard D. Apley 837,030 1 1/1906 Blanchard 273/164 Attorney, Agent, or FirmFetherstonhaugh & C0. 1,585,190 5/1926 Girdwood 1 1 1 273/80 1,683,639 9/1928 Vaile t t t 273/169 X 57 ST C 2,066,962 1/1937 Cross .1 273/80 A 2.088.095 7/1937 Sargent et a1 273/80 golf Club adapted be Played 9" 2.231.847 2/1941 Dickson et a1 .1 273/808 x P b dy rather 1 through 8 1 4 of 2320638 1 1953 Morrison H 2 0 X the kind WhlCh 1s swung 1n a plane incllned to the ver- 2,926,913 3/1960 Stecher 273/80 tical, having a shaft with an elongated hand grip at one 295 .6 /1960 w potas 273/164 end and a club head with a generally planar ball strik- 9 11/196?- Dude" 273/813 ing surface at the other end, in which the hand grip E sl; 4 4 4 axis lies in a plane normal to the striking surface and OTB 3C 1 1 4 3 9 5/1967 Summers 273/164 including the center of merna of the club. 3.399.898 9/1968 Burkland 273/80 X 9 Claims, 3 Drawing Figures Ill/ER TIA CENTRE OF PATENTEDJUH 10 m5 3,888,484
CENTRE OF INE R TIA I9 c wmeor' INE'R TIA luv/mm? HENRY D. Z I TK 0 GOLF CLUB BACKGROUND OF THE INVENTION This invention is concerned with golf clubs. particularly, but not necessarily exclusively, with putters. It is exclusively concerned with the type of club which is intended to be played in the conventional fashion rather than in the croquet mallet fashion through the legs. In other words, it is concerned with a club of the kind which is swung in a plane inclined to the vertical. The common golf club with a hand grip. a shaft and a head has the head projecting outwardly and downwardly from the shaft and has its center of inertia laterally offset from the axis of the hand grip, i.e. from the axial center line of the hand grip. This offset produces a force tending to twist the clubhead about that axis as the club is accelerated during the swing and consequently it is only by resisting this tendency or by taking it into account that a player can cause the head to strike the ball in the attitude which is intended.
SUMMARY OF THE INVENTION It has been discovered that by eliminating this tendency to twist a very much improved reliability in accu racy can be obtained. To overcome the tendency it is proposed according to this invention that the axis of the hand grip should, during a proper swing, generate a plane which includes the center of inertia (center of percussion) of the club.
In a particular embodiment it is proposed that the hand grip axis lie in a plane including the point on the ball striking surface of the club head at which a ball is intended to be struck and the center of inertia of the club and that plane should be normal to the ball strik ing surface.
Preferably the hand grip axis passes through the club head and desirably it passes through the ball striking surface.
It is desirable to have the club head extended rearwardly from the ball striking surface and to mark that extension with a sighting line. The sighting line can be formed between two inclined surfaces meeting at a ridge which would constitute the sighting line.
It will be appreciated that in many instances the hand grip and the shaft can be coaxial but it may be convenient to crank the shaft to offset the hand grip axis from that of the shaft to suit a particular players needs and give an unobscured view of the ball striking surface and the ball.
Alternatively, a hand grip can be utilized with its axis misaligned with the shaft axis to the degree that maintains alignment with the centre of inertia without cranking the shaft.
BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the invention is illustrated in the accompanying drawings in which,
FIG. 1 is a front view of a putter according to this Invention,
FIG. 2 is a side view of the putter of FIG. 1, and
FIG. 3 is a plan view of the putter of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawings the lower part of the shaft of the club is indicated by numeral I and the head by numeral 11. The hand grip 12 has its axial center line 12a coincidental with the major part of the shaft as shown in the drawings but the lower end of the shaft is cranked as at 13. By cranking the shaft in this manner the player is afforded a substantially unobscured view of the club head and ball whilst the axial center line of the hand grip is, as described hereinafter, in a plane including the center of inertia of the club. It will be appreciated that were a straight shaft aligned with the center of inertia and passed through the ball striking surface of the club head the player's view would be slightly obscured and whilst this is not considered to be a major drawback as far as the use of the club is concerned to some players it can tend to be a problem.
The club head has a generally planar ball striking sur' face 16 of which the center point is the point intended to strike the ball.
The club has a rearwardly extending portion 17 which constitutes a flat sole serving as a rest during the address of the ball. The club head tapers upwardly from the flat sole to the ball striking surface 16 as can be seen at 17a particularly in FIG. 2 to provide a skid to reduce the effect of any high spots on the ground immediately behind the ball. At the rear end 21 of the club head, i.e., that end most remote from the surface I6, the head tapers upwardly and rearwardly as can be seen at 17b in FIG. 2 particularly. The upward inclination of the rear end 2] of the club head gives clearance for the follow through of the swing.
The view of the club head presented to the player is of two inclined surfaces I8 and 19 which come together at a ridge 20 which is the center line of the club head. This ridge 20 provides a sighting line which aids the player in aiming.
The center of inertia of the club will lie in some position displaced from the center of gravity of the club as that marked C in the drawings. The center line 12a of the hand grip lies in a plane normal to striking surface 16 and passing through said center of inertia, and in this embodiment said plane also passes through a line normal to the surface 16 and passing through the center point 16a of that surface.
It will be appreciated that by arranging the hand grip axis to lie in the plane including the center of inertia of the club and the intended line of travel of the ball there will be no tendency for the club head to pivot about that axis as it is swung as would be the case where the handgrip is in line with the center of gravity of the club head or club.
It is appreciated that it will in some circumstances be difficult to determine where the center of inertia lies but a relatively simple test which can be used during manufacture is to mount the club with the hand grip clamped to a rotatable bearing which is in turn pivotally mounted so that the swing of the club through a vertical plane can be reproduced. If the hand grip axis is not in the plane of the center of inertia then there will be a tendency for the club to rotate about the hand grip axis within the bearing. This rotation can be observed fairly readily by noticing the deflection of a beam of light directed on to a mirror secured to the ball striking surface of the club. If there is a deviation from this alignment then corrections can be made by cranking the shaft of the club.
I. A golf club of the kind which is swung in a plane inclined to the vertical, comprising a shaft, an elongated hand grip on one end of the shaft, a club head on the opposite end of the shaft and having a wide substantially planar ball striking surface, said shaft being inclined relative to the head when the latter is in a normal ball-striking position. said club having a center of inertia when swung through a ballstriking stroke. and said hand grip having an axis lying in a plane normal to the striking surface and including said center of inertia.
2. A golf club as claimed in claim 1, in which the hand grip axis passes through the club head.
3. A golf club as claimed in claim 1, in which the club head has an extension rearwardly away from the ball striking face and a sighting line formed on that exten- 4. A golf club as claimed in claim 1, in which the club head has a rearward extension including two inclined surfaces meeting in a ridge to form a sighting line.
5. A golf club as claimed in claim 1 in which said opposite end ofthe shaft is cranked downwardly from said shaft to the club head.
6. A golf club as claimed in claim 1 in which said striking surface of the club head is wider than the height of said surface.
7. A golf club as claimed in claim 6 in which said club head is formed with a flat bottom sole, said head tapering upwardly and forwardly from the sole to the striking surface and tapering upwardly and rearwardly from said sole.
8. A golf club as claimed in claim 6 in which the club head has an extension rearwardly away from the ball striking face and a sighting line formed on said exten- 9. A golf club of the kind which is swung in a plane inclined to the vertical, comprising a shaft, an elongated hand grip on one end of the shaft, a club head on the opposite end of the shaft and having a wide substantially planar ball striking surface and a point on the striking surface at which a ball is intended to be struck, said shaft being inclined relative to the head when the latter is in a normal ball-striking position, said club having a center of inertia when swung through a ballstriking stroke, and said hand grip having an axis lying in a plane normal to the striking surface and including said center of inertia.
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|U.S. Classification||473/252, 473/255, 473/313|
|International Classification||A63B53/00, A63B53/04|