Golf club heads with undercuts and inserts

Abstract

We provide an iron-type golf club head with a rear cavity and a rear cavity insert. [Solution] The rear outer circumference of the iron-type golf club head and the rear surface of the striking surface cooperate to form a rear cavity. The rear outer circumference can constitute any edge or percentage around the rear cavity. The insert 200 may be positioned within the rear cavity so as to cover at least 60 to 100 percent of the rear surface area of ​​the striking surface. When the insert is attached to the rear surface of the striking surface of the iron-type golf club head, the insert interacts with the striking surface of the iron-type golf club head as the striking surface deforms and rebounds.

Claims

1. It is an iron-type golf club head, Iron-type golf club head body, Insert and, Equipped with, The aforementioned iron-type golf club head body, Front and, The rear and, The upper part including the upper rail, The bottom part including the sole, The striking surface and, Equipped with, The striking surface includes a striking surface front located at the front and a striking surface rear located opposite to the striking surface front toward the rear, The striking surface further includes the geometric center of the striking surface, the periphery of the striking surface, and the thickness measured from the front surface to the back surface of the striking surface, The rear outer peripheral extension extends rearward from the periphery of the striking surface, The rear surface of the striking surface and the rear outer peripheral extension cooperate to define the rear cavity. The insert is Adhesive layer, Elastomer layer and The cap and Equipped with, The insert is configured to be housed in the rear cavity and attached to the rear surface of the striking surface by adhesive bonding. The adhesive layer consists of a single, continuous portion. The elastomer layer includes a first plurality of portions, The cap includes a second plurality of parts, The first plurality of portions of the elastomer layer are aligned with the second plurality of portions of the cap. One elastomer layer portion and one cap portion form an insert portion, each of the multiple elastomer layer portions is paired with a different cap portion, and each of the multiple cap portions is paired with an individual elastomer core portion such that the insert comprises a third or multiple insert portions. The third plurality of insert portions are separated from each other by gaps such that none of the third plurality of portions are directly connected to each other. Iron-type golf club head.

2. The insert further includes a maximum insert length measured from the front to the rear end and a maximum insert height measured from the bottom to the top. The aforementioned maximum insert length is in the range of 2.80 inches to 3.00 inches. The maximum insert height is in the range of 1.20 inches to 1.30 inches. The iron-type golf club head according to claim 1.

3. The iron-type golf club head according to claim 1, wherein each of the insert portions is fixed to the adhesive layer.

4. The iron-type golf club head according to claim 1, wherein the insert further includes a gap width that includes a minimum gap width in a stationary state and a maximum gap width in an extended state.

5. The iron-type golf club head according to claim 4, wherein the minimum gap width is in the range of 0.005 inches to 0.010 inches.

6. When the golf club head strikes the golf ball, the striking surface flexes and displaces backward. When the striking surface flexes and displaces backward, the insert, which is attached with adhesive, also flexes and displaces due to the rear surface of the striking surface, and the gap width increases. The maximum gap width is up to 0.010 inches larger than the minimum gap width. The iron-type golf club head according to claim 5.

7. The iron-type golf club head according to claim 1, wherein the plurality of parts comprises seven parts.

8. The iron-type golf club head according to claim 7, wherein the seven parts further include two front-end parts, three central parts, and two rear-end parts.

9. The two aforementioned tip portions include an upper tip portion and a lower tip portion, The two rear end portions include an upper rear end portion and a lower rear end portion, The iron-type golf club head according to claim 8, wherein the three central portions include an upper central portion, a central portion on the rear end side of the bottom, and a central portion on the front end side of the bottom.

10. The two rear end portions are adjacent to the central upper portion and the central rear end portion of the bottom, The iron-type golf club head according to claim 9, wherein the two tip portions are adjacent to the central upper portion and the central tip portion of the bottom.

11. The iron-type golf club head according to claim 1, wherein the adhesive layer is formed from a foam-based ultra-high-bonding (VHB) tape.

12. The iron-type golf club head according to claim 1, wherein the elastomer layer portion includes a Shore D hardness in the range of 70 to 100.

13. The iron-type golf club head according to claim 1, wherein the cap portion is made of metal.

14. The iron-type golf club head according to claim 1, wherein the elastomer layer comprises a flexible polymer material or a rubber material.

15. It is an iron-type golf club head, Iron-type golf club head body, Insert and, Equipped with, The aforementioned iron-type golf club head body, Front and, The rear and, The upper part including the upper rail, The bottom part including the sole, The striking surface and, Equipped with, The striking surface includes a striking surface front located at the front and a striking surface rear located opposite to the striking surface front toward the rear, The striking surface further includes the geometric center of the striking surface, the periphery of the striking surface, and the thickness measured from the front surface to the back surface of the striking surface, The rear outer peripheral extension extends rearward from the periphery of the striking surface, The rear surface of the striking surface and the rear outer peripheral extension cooperate to define the rear cavity. The insert is Adhesive layer, The cap and Equipped with, The insert is configured to be housed in the rear cavity and attached to the rear surface of the striking surface by adhesive bonding. The adhesive layer consists of a single continuous piece, The cap includes multiple parts, The plurality of cap portions are separated from each other by gaps so that the plurality of portions are not directly connected to each other. Iron-type golf club head.

16. The iron-type golf club head according to claim 15, wherein the insert further includes a gap width that includes a minimum gap width in a stationary state and a maximum gap width in an extended state.

17. The iron-type golf club head according to claim 16, wherein the minimum gap width is in the range of 0.005 inches to 0.010 inches.

18. When the golf club head strikes the golf ball, the striking surface flexes and displaces backward. When the striking surface flexes and displaces backward, the insert, which is attached with adhesive, also flexes and displaces due to the rear surface of the striking surface, and the gap width increases. The maximum gap width is up to 0.010 inches larger than the minimum gap width. The iron-type golf club head according to claim 17.

19. The iron-type golf club head according to claim 15, wherein the plurality of cap portions include four cap portions.

20. The iron-type golf club head according to claim 19, wherein the plurality of cap portions include an upper cap portion, a tip cap portion, a lower cap portion, and a rear end cap portion.

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