Multiple material driver-type golf club head

Abstract

A driver-type golf club head having a composite crown is disclosed herein. The driver-type golf club head includes a subassembly including a cast face component and a stamped sole component, and a compression molded crown component which is bonded to the subassembly. Each of the subassembly and the crown component has a non-overlapping bonding flange that bonds with an interior surface.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]The present application claims priority to U.S. Provisional Patent Application No. 61 / 119,997, filed on Dec. 4, 2008.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not ApplicableBACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]The present invention relates to a method for a multiple material driver-type golf club head.[0005]2. Description of the Related Art[0006]The prior art discloses several methods for forming a golf club head.[0007]One method is full casting which involves casting the entire golf club head, usually with a face pull tool. Duquette et al., U.S. Pat. No. 6,978,976 for a Magnetized Core With Pneumatic Release System For Creating A Wax Mold For A Golf Club Head describes certain aspects of the full casting method. Then a face insert is welded to the golf club head.[0008]Another method is using a full casting method, using a face pull tool and then cutting a crown opening. A graphite cr...

AI Technical Summary

Benefits of technology

[0013]The present invention seeks to reduce the waste from current blacktop manufacturing methods while achieving similar or better performance than the high performance multiple piece golf club heads at a price point that is similar to conventional multiple piece golf club heads.

[0015]Thus, the present invention results in a significant reduction in finishing costs. More specifically, the finishing process for weld polishing requires expensive polishing belts. There are approximately five different belts ranging from very coarse to very fine. Each belt can usually polish around four to five golf club heads.

[0017]The resulting weight of the crown in carbon composite ranges from 15 grams to 35 grams, more preferably from 20 grams to 30 grams and is most preferably 24 grams. The weight of the crown in the high performance multi-piece of the prior art is approximately 31 grams. By using the method of construction of the present invention, a manufacturer obtains at least an additional seven grams of discretionary weight that can be used in other sections of the golf club head to improve mass properties such as moment of inertias (Izz, Iyy and Izz) through the center of gravity of the golf club head, durability (thicker face regions or other regions open to stress during loading), and lower positioning of the center of gravity by shifting the mass of the golf club head.

[0019]This present invention is unique from other composite crown golf club heads or high performance multi-piece construction golf club heads because material is not wasted beyond what is necessary to form the golf club head. In traditional composite crown golf club heads, the whole golf club head is formed (either by casting or welding) and then an opening is cut from this whole golf club head for the composite crown. In the high performance multi-piece construction golf club heads, the crown component material is very expensive relative to conventional stamped or cast materials, and this high performance multi-piece construction golf club head crown component material needs to be chemically milled to achieve its performance. The cutting and chemical milling wastes material and adds cost to achieve performance. The method of the present invention achieves the same performance without adding additional costs.

Problems solved by technology

More specifically, the finishing process for weld polishing requires expensive polishing belts.

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