US20090017936A1 - Golf putter - Google Patents
Golf putter Download PDFInfo
- Publication number
- US20090017936A1 US20090017936A1 US12/214,282 US21428208A US2009017936A1 US 20090017936 A1 US20090017936 A1 US 20090017936A1 US 21428208 A US21428208 A US 21428208A US 2009017936 A1 US2009017936 A1 US 2009017936A1
- Authority
- US
- United States
- Prior art keywords
- putter
- center
- shaft
- grip
- putter head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/007—Putters
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/02—Joint structures between the head and the shaft
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/42—Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B2053/0491—Heads with added weights, e.g. changeable, replaceable
Definitions
- the present invention relates to a putter in which a center of impact of a shaft is shifted toward the putter grip and more preferably to a putter in which a torsional moment of a putter head is balanced between the toe side and heel side.
- the putters according to the prior art have been designed to prevent off-center hitting of the putter head, but the designs could't have been applied sufficiently to the putters. Furthermore, there was no consideration of off-direction moving of the putter head and the grip in the designs, thus the putters according to the prior art had only an advantage of some static balance of head.
- the present invention provides a golf putter free from off-center hitting of the putter head and off-direction moving of the putter head and grip at putting a golf ball.
- the present inventors found that a dynamically balanced design is important in comparison with a statically balanced design to solve the problems such as off-center hitting of a putter head, moving the putter grip and twist of the putter head.
- off-center hitting of a putter head is caused when a torsional moment around a shaft axis centered on an intersection point between the putter head and the shaft axis is not balanced each other.
- Off-direction moving of the putter head and the grip is caused when a center of impact does not exist in the vicinity of a putter grip position.
- a golf putter includes a weighting member W having a weight of 20 g or more that is positioned at a distance of 1 cm or more away from an upper face of the putter head toward the shaft.
- the weighting member performs a function of shifting a center of gravity of the putter toward the heel of putter head and shifting a center of impact of the shaft toward the putter grip.
- a golf putter includes a weighting member W that is positioned at a distance of 1 cm or more away from an upper face of the putter head toward the shaft.
- the weighting member performs a function of balancing a torsional moment around the shaft axis of the toe side from an intersection point between the shaft axis and the putter head and a torsional moment around the shaft axis of the heel side from the intersection point and shifting a center of impact of the shaft toward the putter grip.
- the golf putter according to the first or second aspect of the invention is improved in the following ways. (1) By balancing the torsional moment around the shaft axis of the toe side from the intersection point between the shaft axis and the putter head and the torsional moment around the shaft axis of the heel side from the intersection point, off-center hitting of the putter head can be suppressed. (2) By shifting the center of impact of the shaft toward the putter grip, and preferably by positioning the center of impact of the shaft at the putter grip or in the vicinity of the putter grip, off-direction moving of the putter head and the grip can be suppressed.
- FIG. 1 is a perspective view illustrating a putter club according to a first embodiment of the invention.
- FIGS. 2 ( a ) and 2 ( b ) are explanatory views illustrating torsional moment balance of the putter club according to the first embodiment of the invention.
- FIGS. 3 ( a ) and 3 ( b ) are explanatory views illustrating a center of force of the putter club according to the first embodiment of the invention.
- FIG. 4 is a schematic perspective view illustrating a putter club according to a second embodiment.
- FIG. 5 is a side view illustrating a putter head and a weighting member according to the second embodiment.
- a leading end of the shaft S is connected to a putter head H at a position on a heel side apart from a center of gravity of the putter head H.
- the shaft straightly extends from the leading end to a curved point at a height of 3 cm in a vertical direction.
- the shaft is slightly inclined backward from the curved point.
- a putter grip G is provided on the trailing end of the shaft.
- a rectangular weighting member W having a weight of 15 g, preferably a weight of 15 to 100 g is provided at a position above the curved point of the shaft axis.
- the torsional moment balance (Twist Moment Balance) is represented by
- ⁇ is rotational angle acceleration
- h is translational acceleration
- Ww, Rw, and tw are selected.
- an inertia moment I is defined as a moment around a center of force CF of the putter
- a distance LH is defined as a distance from the center of force CF of the putter to the putter head.
- the center of force CF is referred to as a balance point of a moment of a shaft axis when the putter is rotated and is translated by being swung.
- the weighting member W shifts a center of impact of the putter by a distance of Lsh from the center of force CF of the putter toward the putter grip, preferably, to a position of the putter grip or in the vicinity thereof.
- the shaft may straightly extend without a curved point and be directly attached.
- the center of gravity of the putter head is slightly shifted, but the center of impact is shifted to the putter grip position or in the vicinity thereof similarly to the case mentioned above.
- a center of force RCF is represented by the following expression.
- a point at which a RCF (center of force) rotation moment Ms is equal to 0 is defined as a center of force.
- the inertia moment I is represented by the following expression.
- FIGS. 4 and 5 show a second embodiment.
- the weighting member W is formed to extend in a front and back direction of the putter head H instead of a widthwise direction (a direction connecting the toe and the heel) of the putter head H as shown in the first embodiment.
Abstract
The present invention improves putting performance of a golf putter by balancing a torsional moment of the putter head.
Golf putter includes a weighting member (W) having a weight of 15 g or more that is positioned at a distance of 1 cm or more away from an upper face of a putter head (H) toward a shaft (S). The weighting member performs a function of shifting a center of gravity of the putter toward a heel thereof and shifting a center of impact of the shaft toward a putter grip (G). Thereby, the weighting member enables a better putting by preventing off-center hitting of a putting face of the putter and preventing off-direction moving of the putter head and grip (G) at the time of putting.
Description
- The present invention relates to a putter in which a center of impact of a shaft is shifted toward the putter grip and more preferably to a putter in which a torsional moment of a putter head is balanced between the toe side and heel side.
- In a golf putter, it is important that a golf ball is hit without off-center hitting of the putter head and off-direction moving of the putter head and the grip at putting the golf ball.
- The putters according to the prior art have been designed to prevent off-center hitting of the putter head, but the designs couldn't have been applied sufficiently to the putters. Furthermore, there was no consideration of off-direction moving of the putter head and the grip in the designs, thus the putters according to the prior art had only an advantage of some static balance of head.
- Japanese Unexamined Patent Publication No. 2000-271253
- Japanese Unexamined Patent Publication No. H10-314351
- Japanese Unexamined Patent Publication No. H08-196667
- Japanese Utility Model Registration No. 3100487
- The present invention provides a golf putter free from off-center hitting of the putter head and off-direction moving of the putter head and grip at putting a golf ball.
- The present inventors found that a dynamically balanced design is important in comparison with a statically balanced design to solve the problems such as off-center hitting of a putter head, moving the putter grip and twist of the putter head.
- In other words, off-center hitting of a putter head is caused when a torsional moment around a shaft axis centered on an intersection point between the putter head and the shaft axis is not balanced each other. Off-direction moving of the putter head and the grip is caused when a center of impact does not exist in the vicinity of a putter grip position. In consideration of the above-mentioned facts, the present invention has been accomplished.
- According to the first aspect of the present invention, a golf putter includes a weighting member W having a weight of 20 g or more that is positioned at a distance of 1 cm or more away from an upper face of the putter head toward the shaft. The weighting member performs a function of shifting a center of gravity of the putter toward the heel of putter head and shifting a center of impact of the shaft toward the putter grip.
- According to the second aspect of the invention, a golf putter includes a weighting member W that is positioned at a distance of 1 cm or more away from an upper face of the putter head toward the shaft. The weighting member performs a function of balancing a torsional moment around the shaft axis of the toe side from an intersection point between the shaft axis and the putter head and a torsional moment around the shaft axis of the heel side from the intersection point and shifting a center of impact of the shaft toward the putter grip.
- The golf putter according to the first or second aspect of the invention is improved in the following ways. (1) By balancing the torsional moment around the shaft axis of the toe side from the intersection point between the shaft axis and the putter head and the torsional moment around the shaft axis of the heel side from the intersection point, off-center hitting of the putter head can be suppressed. (2) By shifting the center of impact of the shaft toward the putter grip, and preferably by positioning the center of impact of the shaft at the putter grip or in the vicinity of the putter grip, off-direction moving of the putter head and the grip can be suppressed.
-
FIG. 1 is a perspective view illustrating a putter club according to a first embodiment of the invention. -
FIGS. 2 (a) and 2(b) are explanatory views illustrating torsional moment balance of the putter club according to the first embodiment of the invention. -
FIGS. 3 (a) and 3(b) are explanatory views illustrating a center of force of the putter club according to the first embodiment of the invention. -
FIG. 4 is a schematic perspective view illustrating a putter club according to a second embodiment. -
FIG. 5 is a side view illustrating a putter head and a weighting member according to the second embodiment. - W: WEIGHTING MEMBER
- H: PUTTER HEAD
- G: PUTTER GRIP
- S: SHAFT
- Hereinafter, embodiments of the invention will be described with reference to detailed examples.
- As shown in
FIG. 1 , a leading end of the shaft S is connected to a putter head H at a position on a heel side apart from a center of gravity of the putter head H. The shaft straightly extends from the leading end to a curved point at a height of 3 cm in a vertical direction. The shaft is slightly inclined backward from the curved point. On the trailing end of the shaft, a putter grip G is provided. In the embodiment of the invention, a rectangular weighting member W having a weight of 15 g, preferably a weight of 15 to 100 g is provided at a position above the curved point of the shaft axis. - With such a configuration, it is possible to shift a center of gravity of the putter head toward a heel side, and balance a torsional moment of a toe side from an intersection point J between the shaft axis and the putter head and a torsional moment of a heel side from the intersection point by a torsional moment of the weighting member so as to offset difference between the torsional moment of the toe side and the torsional moment of the heel side in a preferred case as shown in
FIGS. 2( a) and 2(b). Furthermore, inFIG. 2 , motion of the putter grip G is represented by h=−RGΘ when xG=RGΘ+h=0. - The torsional moment balance (Twist Moment Balance) is represented by
-
- where
- Θ is rotational angle acceleration, and
- h is translational acceleration.
- To satisfy the equation mentioned above, Ww, Rw, and tw are selected.
- Furthermore, as shown in
FIGS. 3( a) and 3(b), an inertia moment I is defined as a moment around a center of force CF of the putter, and a distance LH is defined as a distance from the center of force CF of the putter to the putter head. The center of force CF is referred to as a balance point of a moment of a shaft axis when the putter is rotated and is translated by being swung. In consideration of the above-mentioned factors, the weighting member W shifts a center of impact of the putter by a distance of Lsh from the center of force CF of the putter toward the putter grip, preferably, to a position of the putter grip or in the vicinity thereof. - The shaft may straightly extend without a curved point and be directly attached. In this case, the center of gravity of the putter head is slightly shifted, but the center of impact is shifted to the putter grip position or in the vicinity thereof similarly to the case mentioned above.
- The center of impact is defined as a position X2 in which is free from off-center hitting by balancing a translational acceleration h2 and a rotational acceleration θ2, X2=h2−θ2×Ls=0, where Ls is a distance from the center of force to the putter grip. Furthermore, a distance from the center of force CF of the putter to the center of impact of the putter is represented by Ls=I/W×LH, where I is the inertia moment around the center of force, W is a total weight of the putter, and LH is a distance from the center of force to the putter head.
- In addition, a center of force RCF is represented by the following expression.
- A point at which a RCF (center of force) rotation moment Ms is equal to 0 is defined as a center of force.
- The inertia moment I is represented by the following expression.
-
- Furthermore, LH=(RH−RCE), and LIC=Ig/WLh.
-
FIGS. 4 and 5 show a second embodiment. In the embodiment, the weighting member W is formed to extend in a front and back direction of the putter head H instead of a widthwise direction (a direction connecting the toe and the heel) of the putter head H as shown in the first embodiment.
Claims (3)
1. A golf putter comprising a weighting member (W) having a weight of 15 g or more that is positioned at a distance of 1 cm or more away from an upper face of a putter head (H) toward a shaft (S) so as to shift a center of gravity of the putter head toward a heel thereof and shift a center of impact of the shaft (S) toward a putter grip (G).
2. A golf putter comprising a weighting member (W) that is positioned at a distance of 1 cm or more away from an upper face of a putter head (H) toward a shaft (S) so as to balance a torsional moment around the shaft axis of a toe side from an intersection point between the shaft (S) axis and the putter head (H) and a torsional moment around the shaft axis of a heel side from the intersection point and shift a center of impact of the shaft (S) toward a putter grip (G).
3. The golf putter according to claim 1 or 2 , wherein the center of impact of the shaft (S) is positioned at the putter grip (G) or in the vicinity of the putter grip (G).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPJP2007-162800 | 2007-06-20 | ||
JP2007162800 | 2007-06-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090017936A1 true US20090017936A1 (en) | 2009-01-15 |
Family
ID=40253619
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/214,282 Abandoned US20090017936A1 (en) | 2007-06-20 | 2008-06-18 | Golf putter |
Country Status (2)
Country | Link |
---|---|
US (1) | US20090017936A1 (en) |
JP (1) | JP2009022748A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160175665A1 (en) * | 2013-04-18 | 2016-06-23 | Bottom of the Cup, LLC | Self-Balancing Golf Club With Rearward Leaning Shaft |
US20160193666A1 (en) * | 2012-12-21 | 2016-07-07 | Franz Haimer Maschinenbau Kg | Tool holder with built-in cavities |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101184046B1 (en) | 2010-10-22 | 2012-09-18 | 장정녀 | Golf putter having a shaft structure for enhancing the putting performance |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3625517A (en) * | 1969-11-10 | 1971-12-07 | John E Durnack | Golf putter with center of mass aligned with shaft axis |
US4693478A (en) * | 1986-03-17 | 1987-09-15 | Macgregor Golf Company | Golf putter head |
US5133555A (en) * | 1991-12-16 | 1992-07-28 | Bailey Howard L | Golf putter |
US6358162B1 (en) * | 2000-02-14 | 2002-03-19 | John Piotrowski | Golf putter with green-reading features |
US20060281578A1 (en) * | 2005-06-10 | 2006-12-14 | Luis Pedraza | Golf club |
US20070042832A1 (en) * | 2005-08-18 | 2007-02-22 | Hjaltason Thor D | Golf club |
-
2008
- 2008-06-18 US US12/214,282 patent/US20090017936A1/en not_active Abandoned
- 2008-06-20 JP JP2008161897A patent/JP2009022748A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3625517A (en) * | 1969-11-10 | 1971-12-07 | John E Durnack | Golf putter with center of mass aligned with shaft axis |
US4693478A (en) * | 1986-03-17 | 1987-09-15 | Macgregor Golf Company | Golf putter head |
US5133555A (en) * | 1991-12-16 | 1992-07-28 | Bailey Howard L | Golf putter |
US6358162B1 (en) * | 2000-02-14 | 2002-03-19 | John Piotrowski | Golf putter with green-reading features |
US20060281578A1 (en) * | 2005-06-10 | 2006-12-14 | Luis Pedraza | Golf club |
US20070042832A1 (en) * | 2005-08-18 | 2007-02-22 | Hjaltason Thor D | Golf club |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160193666A1 (en) * | 2012-12-21 | 2016-07-07 | Franz Haimer Maschinenbau Kg | Tool holder with built-in cavities |
US20160175665A1 (en) * | 2013-04-18 | 2016-06-23 | Bottom of the Cup, LLC | Self-Balancing Golf Club With Rearward Leaning Shaft |
Also Published As
Publication number | Publication date |
---|---|
JP2009022748A (en) | 2009-02-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |