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Muscle-back iron golf clubs with higher moment of intertia and lower center of gravity

a golf club and muscle back technology, applied in golf clubs, golf, sport apparatus, etc., can solve the problems of reducing the inertia of the club, increasing the difficulty of hitting consistently well, and increasing the difficulty of the average golfer to swing properly, so as to improve the mass properties, improve the inertia, and the effect of reducing the center of gravity

Inactive Publication Date: 2007-12-06
ACUSHNET CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention relates to muscle-back iron golf clubs that have improved mass properties, such as lower center of gravity and higher moments of inertia.

Problems solved by technology

Therefore, the club heads of the long irons have a smaller face surface area than the short irons and are typically more difficult for the average golfer to hit consistently well.
One challenge for the golf club designer when maximizing the size of the club head is to maintain a desirable and effective overall weight of the golf club.
For example, if the club head of a three-iron is increased in size and weight, the club may become more difficult for the average golfer to swing properly.
However, these heavy inserts reduce the inertia of the club.

Method used

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  • Muscle-back iron golf clubs with higher moment of intertia and lower center of gravity
  • Muscle-back iron golf clubs with higher moment of intertia and lower center of gravity
  • Muscle-back iron golf clubs with higher moment of intertia and lower center of gravity

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Embodiment Construction

[0034]Rotational moments of inertia (inertia) in golf clubs are well known in art, and are fully discussed in many references, including U.S. Pat. No. 4,420,156, which is incorporated herein by reference in its entirety. When the inertia is too low, the club head tends to rotate about an axis excessively from off-center hits. Higher inertia indicates higher rotational mass and less rotation from off-center hits, thereby allowing off-center hits to fly farther and closer to the intended path. Inertia is measured about a vertical axis going through the center of gravity (e.g.) of the club head (Iyy), and about a horizontal axis through the c.g. of the club head (Ixx), as shown in FIG. 1. Although not shown, rotational inertia about the z-axis (Izz) is measured about the axis orthogonal to both the x- and y-axis. The tendency of the club head to rotate around the y-axis through the c.g. indicates the amount of rotation that an off-center hit away from the y-axis causes. Similarly, the ...

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Abstract

Disclosed herein are muscle-back iron golf clubs that have improved mass qualities to provide higher rotational moments of inertia and lower center of gravity while retaining the workability of muscle-back irons and the size, shape and dimensions preferred by tour players and low handicap players.

Description

FIELD OF THE INVENTION[0001]This invention generally relates to golf clubs, and, more particularly, to muscle-back iron-type clubs.BACKGROUND OF THE INVENTION[0002]Individual iron club heads in a set typically increase progressively in face surface area and weight as the clubs progress from the long irons to the short irons and wedges. Therefore, the club heads of the long irons have a smaller face surface area than the short irons and are typically more difficult for the average golfer to hit consistently well. For conventional club heads, this arises at least in part due to the smaller sweet spot of the corresponding smaller face surface area.[0003]To help the average golfer consistently hit the sweet spot of a club head, many golf clubs are available with cavity-back constructions for increased perimeter weighting. Perimeter weighting also provides the club head with higher rotational moment of inertia about its center of gravity. Club heads with higher moments of inertia have a ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B53/00
CPCA63B53/0475A63B53/047A63B2053/0454A63B2053/0491A63B53/0454A63B60/02A63B53/04A63B53/0437
Inventor GILBERT, PETER J.JORGENSEN, DOUGLAS C.
Owner ACUSHNET CO
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