Golf club iron set producing flight having consistent angle of descent

Patent metadata

Field	Value
Publication number	US-9387374-B2
Application number	US-201414505707-A
Country	US
Kind code	B2
Filing date	Oct 3, 2014
Priority date	Sep 10, 2012
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

In accordance with the present invention, a set of golf club heads is disclosed. The set includes golf club heads with peripheral weights. The dimensions and configuration of at least the peripheral weights are changed from club-to-club along the set so that the center of gravity rises from the long irons to the short irons. By raising the center of gravity from the long irons to the short irons, a golfer will see a peak trajectory height along a line for each club head that is substantially more consistent along that line throughout the set than prior art clubs provide.

First claim

What is claimed is:

1. A set of golf clubs comprising at least a first golf club, a second golf club, and a third club, wherein
the first, second and third golf clubs each comprising a heel, a toe, an upper surface, a lower surface, a hosel and a front face, and
the first golf club further comprising a first loft angle (LA 1 ) of between 15 and 25 degrees and a first center of gravity height and a first angle of decent (AD) when hitting a ball, using a hitting machine, at a club head speed of 97 mph and an attack angle of −5 degrees,
the second golf club comprising a second loft angle (LA 2 ) of between 26 and 36 degrees and a second center of gravity height that is greater than the first center of gravity height and a second angle of decent (AD) when hitting the ball, using the hitting machine, at a club head speed of 95mph and an attack angle of −6 degrees, and
the third golf club comprising a third loft angle (LA 3 ) of between 37 and 47 degrees and a third center of gravity height that is greater than the second center of gravity height and a third angle of decent (AD) when hitting the ball, using the hitting machine, at a club head speed of 92mph and an attack angle of −7.5degrees,
wherein the set has a best fit linear equation for the first, second and third angle of descent (AD) according to the following formula:
AD=m ( LA ) +z

wherein LA is the iron loft angle, m is less than 0.5 and z is greater than 30 degrees.

2. The set of golf clubs of claim 1 , wherein m is between 0.1 and 0.4 and z is between 35 and 45 degrees.

3. The set of golf clubs of claim 1 , wherein m is between 0.2 and 0.4 and z is between 35 and 40 degrees.

4. The set of golf clubs of claim 1 , wherein z is about 35-40 degrees.

5. The set of golf clubs of claim 1 , wherein z is about 40 degrees.

6. The set of golf clubs of claim 1 , wherein maximum trajectory height for the first, second and third golf clubs are all between about 30 and 35 yards.

7. The set of golf clubs of claim 6 , wherein maximum trajectory height for the first, second and third golf clubs are substantially similar.

8. The set of golf clubs of claim 1 , wherein the first center of gravity height is less than the second center of gravity height by at least 0.1 inch and the second center of gravity height is less than the third center of gravity height by at least 0.1 inch.

9. The set of golf clubs of claim 8 , wherein the lower surface of the first golf club is formed from a material have a specific gravity of greater than 10 g/cc.

10. The set of golf clubs of claim 9 , wherein a portion of the hosel of the first golf club is comprised of a material having a specific gravity of less than 7 g/cc.

11. The set of golf clubs of claim 1 , wherein each of the first, second and third golf clubs has a shaft axis and the distance from the center of gravity to the shaft axis is approximately constant.

12. The set of golf clubs of claim 1 , wherein each of the first, second and third golf clubs has a shaft axis and the distance from the center of gravity to the shaft axis is inversely proportional to the loft angle.

13. The set of golf club heads of claim 1 , wherein the first golf club has a first offset, the second golf club has a second offset and third golf club has a third offset and first offset is less than 0.15 inch and greater than the second offset and the second offset is greater than the third offset.

14. A set of golf clubs comprising at least a first golf club, a second golf club, and a third club, wherein
the first, second and third golf clubs each comprising a heel, a toe, an upper surface, a lower surface, a hosel and a front face, and
the first golf club further comprising a first loft angle (LA 1 ) of about 21 degrees and a first center of gravity height of about 0.7 to 0.75 inch, a first length of about 39 inches and a first offset of about 0.125 to 0.15 inch, and creating a first angle of decent (AD) when hitting a ball, using a hitting machine, at a club head speed of 97 mph and an attack angle of −5 degrees,
the second golf club comprising a second loft angle (LA 2 ) of about 27 degrees and a second center of gravity height of about 0.8 to 0.85 inch, a second length of about 38 inches and a second offset of about 0.115 to 0.12 inch, and creating a second angle of decent (AD) when hitting the ball, using the hitting machine, at a club head speed of 95 mph and an attack angle of −6 degrees, and
the third golf club comprising a third loft angle (LA 3 ) of about 39 degrees and a third center of gravity height of about 0.9 to 0.95 inch, a third length of about 36.5 inches and a third offset of about 0.09 to 0.1 inch and creating a third angle of decent (AD) when hitting the ball, using the hitting machine, at a club head speed of 92 mph and an attack angle of −7.5 degrees,
wherein the set has a best fit linear equation for the first, second and third angle of descent (AD) according to the following formula:
AD=m ( LA )+ z

wherein LA is the iron loft angle, m is less than 0.5 and z is greater than 30 degrees.

15. A set of golf clubs comprising at least a first golf club, a second golf club, and a third club, wherein
the first, second and third golf clubs each comprising a heel, a toe, an upper surface, a lower surface, a hosel and a front face, and
the first golf club further comprising a first loft angle (LA 1 ) of about 21 degrees and a first center of gravity height (CGH l ) of about 0.7 to 0.75 inch and a first angle of decent (AD) when hitting a ball, using a hitting machine, at a club head speed of 97 mph and an attack angle of −5degrees,
the second golf club comprising a second loft angle (LA 2 ) of about 27 degrees and a second center of gravity height (CGH 2 ) of about 0.8 to 0.85 inch and a second angle of decent (AD) when hitting the ball, using the hitting machine, at a club head speed of 95 mph and an attack angle of −6degrees, and
the third golf club comprising a third loft angle (LA 3 ) of about 39 degrees and a third center of gravity height (CGH 3 ) of about 0.9 to 0.95 inch and a third angle of decent (AD) when hitting the ball, using the hitting machine, at a club head speed of 92 mph and an attack angle of −7.5 degrees,
wherein the set has a best fit linear equation for the angle of descent (AD) according to the following formula:
AD =m ( LA ) + z

wherein LA is the iron loft angle, m is less than 0.5 and z is greater than 30 degrees; and
wherein the difference between (LA 1 )/(CGH 1 ) and (LA 3 )/(CGH 3 ) is between 15 and 11.

16. The set of golf club heads of claim 15 , wherein the difference between (LA 1 )/(CGH 1 ) and (LA 2 )/(CGH 2 ) is between 5.8 and 1.8.

Assignees

• Acushnet Co

Inventors

• Golden Charles E
• Harmet Jeffrey A
• Stone Daniel
• Nelson Richard M

Classifications

• A63B53/047 Primary

  iron-type · CPC title

• A63B2053/0408

  Human Necessities · mapped topic

• A63B2053/005

  Human Necessities · mapped topic

• A63B53/0408

  characterised by specific dimensions, e.g. thickness · CPC title

• A63B53/005

  Club sets · CPC title