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Forged iron-type golf clubs

a golf club and iron-type technology, applied in the field of golf clubs, can solve the problems of low yield strength, more difficult for the average golfer to consistently hit well, and more difficult for the average golfer to swing properly,

Inactive Publication Date: 2005-04-28
ACUSHNET CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] The present invention is directed to golf club head comprising a hosel and a bore extending from the ho...

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.
On the other hand, forgeable alloys are malleable and typically have low yield strengths.
For forged clubs, the face of the club cannot heretofore be made thin, because of this drawback.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Muscle-Back Comparison

[0071] Table 5 compares the location of the CG in conventional muscle-back irons with muscle-back irons made in accordance with the embodiment of the present invention as shown in FIGS. 16-20. The conventional club is a Titleist 690 MB, a forged stainless steel muscle-back club. Three club numbers were compared: the 3-iron, the 6-iron, and the 9-iron.

[0072] As is indicated in Table 5, the CG of the inventive muscle-back clubs are now generally closer to the FC than the conventional club due to the redistribution of mass from the bore and pin.

TABLE 5Center of Gravity Location for Conventional, Inventive MB ClubsClub andCG-ACG-BCG-CCG-x-fcCG-y-fcCG-z-fcCG-y-gType(mm)(mm)(mm)(mm)(mm)(mm)(mm)690MB 367.333.04−5.514.424.54−4.2819.54Inventive62.6134.29−6.011.523.98−4.9518.98MB Club 3Difference4.82−1.250.512.900.560.670.56690MB 665.9833.22−7.963.923.99−4.3218.99Inventive61.5934.81−7.690.333.71−5.5318.71MB Club 6Difference4.39−1.59−0.273.590.284.5726.52690MB 965.883...

example 2

Cavity Back Comparison

[0074] Table 7 compares the location of the CG in a cavity back iron with a cavity back iron made in accordance with the embodiment of the present invention as shown in FIGS. 16-20. The comparative club is a Titleist® 704CB, a forged stainless steel cavity back club. The 3-iron for each club set was tested for comparison.

[0075] As is indicated in Table 7, the CG of the inventive cavity back club is now generally closer to the FC than that of the 704CB club due to the redistribution of mass from the bore and pin.

TABLE 7Center of Gravity Location for 704CB, Inventive ClubsClub andCG-ACG-BCG-CCG-x-fcCG-y-fcCG-z-fcCG-y-gType(mm)(mm)(mm)(mm)(mm)(mm)(mm)704CB 365.5634.19−6.872.853.64−4.8818.64Inventive62.8335.26−6.881.473.47−4.9618.47CB Club 3Difference2.731.070.010.38−0.170.08−0.17

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Abstract

Forged cavity back iron-type clubs and oversize clubs are disclosed. These forged clubs have thin, durable hitting face and relatively large cavity volumes. These clubs have high rotational moments of inertia to minimize distance and accuracy penalties associated with off-center hits. Long irons with hitting face of about 0.100 inch thick are achievable by the present invention. Also disclosed are forged irons made from stainless steels and annealed to achieve the desired hardness and ductility. Further, an interchangeable pin suitable for use in the manufacture of any of a set of iron-type clubs without re-tooling is disclosed. The pin is sized and configured to fit within a through-bore such that an adhesive such as a flexible epoxy may be placed within the gaps to provide a vibration dampening effect.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] The present application is a continuation-in-part of co-pending U.S. patent application Ser. No. 10 / 640,537 filed on Aug. 13, 2003, the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002] This invention generally relates to golf clubs, and, more particularly, to iron-type clubs. BACKGROUND OF THE INVENTION [0003] 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. [0004] To help the average golfer consistently hit the sweet spot of a club head, many golf club...

Claims

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Application Information

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IPC IPC(8): A63B53/04
CPCA63B53/02A63B53/04A63B2053/0408A63B59/0092A63B2209/00A63B53/047A63B60/54A63B53/0408
Inventor GILBERT, PETER J.BURNETT, MICHAEL SCOTTBENNETT, THOMAS ORRIN
Owner ACUSHNET CO
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