MULTI-MATERIAL GOLF CLUB HEAD
A multi-material type golf club head is disclosed. More specifically, the golf club head in accordance with the present invention may have a metallic portion and a lightweight portion, wherein the entirety of the striking face is made out of a metallic material while a majority of the chassis is made out of a lightweight material that serves to reduce the overall weight of the golf club head. The lightweight material, in addition to reducing the overall weight of the golf club head, may be comprised of an interior face support to at least partially support the metallic striking face portion to improve the performance and feel of the golf club head.
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This application is a continuation-in-part (CIP) of U.S. patent application Ser. No. 15/833,935, filed on Dec. 6, 2017, the disclosure of which is incorporated by reference in its entirety.
FIELD OF THE INVENTIONThe present invention relates generally to a multi-material iron golf club head. More specifically, the present invention relates to a multi-material iron golf club head wherein the entirety of the striking face is made out of a metallic material while a majority of the rear chassis is made out of a lightweight material that serves to reduce the amount of mass associated with the metallic portion. In addition to the above, the present invention can further improve upon the performance of the golf club head by at least partially supporting the metallic striking face portion of the golf club head with the lightweight material used for the rear chassis, providing structural support to the striking face, reduce stress, and improve the feel of the golf club head.
BACKGROUND OF THE INVENTIONIn order to keep up with the increasing demands of the golfing public for more technology and performance from their iron type golf club heads, golf club designers have been forced to change the design of iron type golf club heads away from traditional muscle back construction in order to keep up with this trend.
One of the earliest attempts to improve the performance of the iron was to improve the moment of inertia of a golf club head by adding weight to the perimeter of the golf club head to create more forgiveness in off-center shots. U.S. Pat. No. 4,826,172 to Antonious provides an illustration of this technology by showing a perimeter weighted iron-type golf club head with a recessed or cavity back and a peripheral mass having an improved weight configuration.
Another way to improve the forgiveness of an iron type golf club head in addition to removing weight from the central portion and moving it out on the perimeter as illustrated above is to use exotic materials that are heavier than steel. The utilization of exotic materials that are heavier than steel allows more discretionary weight to be created in the same footprint, further improving the performance of an iron type golf club head. U.S. Pat. No. 3,845,960 to Thompson illustrates this principle by placing tungsten powder at the heel and toe end of the golf club head to improve the moment of inertia of the golf club head.
With the development of more advanced materials, the infatuation with lightweight materials such as carbon fiber composite has also worked its way into golf club design, creating yet another way to improve upon the forgiveness of an iron type golf club head. U.S. Pat. No. 4,664,383 to Aizawa provides an early example of this by creating a golf club with resin with woven material as well as resin with non-oriented fibers to create a golf club head.
In addition to making the golf club more forgiving as shown by the three above examples, another way to improve the performance of an iron type golf club head is to improve the ballspeed of the iron type golf club head. One way to achieve this is to decrease the thickness of the striking face of the golf club head. U.S. Pat. No. 6,592,469 to Gilbert provides an example of this technology by teaching a golf club with a thin front face for striking a golf ball and a peripheral weighting surrounding the back of the front face and defining a cavity.
Despite all the attempts to improve the performance of an iron type golf club, none of the designs have been able to combine all of the best characteristics of each individual technology in one compact convenient package. More specifically, none of the designs incorporate advanced material technology to increase the forgiveness and ballspeed of the iron type golf club head in one unitary golf club chassis without sacrificing the aesthetic appeal of the golf club.
BRIEF SUMMARY OF THE INVENTIONOne aspect of the present invention is an iron golf club head comprising of a metallic portion and a lightweight portion. The metallic portion further comprises of a hosel, a heel portion, a topline portion, a sole portion, a striking face, and wherein the metallic portion creates an opening near a toe side of the metallic portion. The lightweight portion further comprises an exposed toe portion, a topline support, a sole support, and an internal face support, wherein the lightweight portion slidably engages the opening near the toe side of the metallic portion. The metallic portion conceals the internal face support, the topline support, and the sole support, and the exposed toe portion of the lightweight portion is exposed externally and forms an external portion of the iron golf club head.
In another aspect of the present invention is an iron golf club head comprising of a metallic portion, a lightweight portion, a heel weight, and a toe weight. The metallic portion further comprises of a hosel, a heel portion, a topline portion, a sole portion, a striking face, and wherein the metallic portion creates an opening near a toe side of the metallic portion. The heel weight is located at a bottom heel portion of the iron golf club head while the toe weight is located at a bottom toe portion of the iron golf club head. The heel weight being retained in the iron golf club head by the metallic portion and the toe weight being retained in the iron golf club head by the lightweight portion.
In another aspect of the present invention is a metalwood golf club head comprising of a metallic portion and a lightweight portion. The metallic portion further comprises a hosel, a sole portion, and a striking face, wherein the metallic portion creates an opening near a top crown portion of the metallic portion that extends into a heel portion of the metalwood golf club head. The lightweight portion further comprises an internal crown support, an internal sole support, and an internal face support, wherein the lightweight portion slidably engages the opening near the top crown portion of the metallic portion. The metallic portion conceals the internal face support and the sole support, and the internal face support contacts a rear surface of the striking face.
In another aspect of the present invention is a hybrid metalwood golf club head comprising of a metallic portion and a lightweight portion. The metallic portion further comprises a hosel, a sole portion, and a striking face, wherein the metallic portion creates an opening near a top crown portion of the metallic portion that extends into a heel portion of the metalwood golf club head. The lightweight portion further comprises an internal crown support, an internal sole support, and an internal face support, wherein the lightweight portion slidably engages the opening near the top crown portion of the metallic portion. The hybrid metalwood has a loft of greater than 17.5 degrees. The hybrid metalwood golf club head has a moment of inertia greater than about 235 kg−mm2. The metallic portion conceal the internal face support and the sole support, and the internal face support contacts a rear surface of the striking face.
These and other features, aspects and advantages of the present invention will become better understood with reference to the following drawings, description and claims.
The foregoing and other features and advantages of the invention will be apparent from the following description of the invention as illustrated in the accompanying drawings. The accompanying drawings, which are incorporated herein and form a part of the specification, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the invention.
The following detailed description describes the best currently contemplated modes of carrying out the invention. The description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention, since the scope of the invention is best defined by the appended claims.
Various inventive features are described below and each can be used independently of one another or in combination with other features. However, any single inventive feature may not address any or all of the problems discussed above or may only address one of the problems discussed above. Further, one or more of the problems discussed above may not be fully addressed by any of the features described below.
It is worth noting here how the separation between the metallic portion 210 and the lightweight portion 212 as illustrated by separation line 111 in
Finally,
In the current exemplary embodiment, the metallic portion 210 may generally be made out of a steel material having higher strength properties. In one exemplary embodiment of the present invention, high strength steel such as Custom 455 Stainless Steel is used for its high strength properties, however numerous other types of high strength steel such as K301 steel, Aeromet 340 steel, SUP-10, or even 17-4 steel may be used without departing from the scope and content of the present invention so long as it can meet the high strength properties required for the present invention. The metallic portion 210 in accordance with an exemplary embodiment of the present invention may generally have a density of greater than about 7.0 g/cc, more preferably greater than about 7.3 g/cc, and most preferably greater than about 7.6 g/cc. The lightweight portion 212 of the present invention may generally be made out of a carbon fiber type composite material that offers lightweight characteristics as well as relative high strength. However, in alternative embodiments, the lightweight material could be created out of aluminum, plastic, rubber, or any other type of lightweight material without departing from the scope and content of the present invention. The lightweight portion 212 in accordance with an exemplary embodiment of the present invention may generally have a density less than about 3.0 g/cc, more preferably less than about 2.5 g/cc, and most preferably less than about 2.0 g/cc. Finally the toe weight 214 and the heel weight 216 shown in this embodiment may generally be made out of a tungsten type material capable of increasing the moment of inertia of the golf club head based on their strategic placement. The tungsten material used for the toe weight 214 and the heel weight 216 may have a density greater than about 12.0 g/cc more preferably greater than about 14.0 g/cc and more preferably greater than about 17.0 g/cc.
In order to provide a more complete illustration of the relationship between the various components,
It is worthwhile here to mention that the lightweight portion 312 of the golf club head 300 in accordance with this exemplary embodiment is unique in its construction, geometry, and shape. To the untrained eye, the lightweight portion 312 may not possess any unique features because most golf clubs utilizes a metallic material to form the lightweight portion 312, and this geometry is easily achieved by casting a metallic part of into this shape. However, as mentioned earlier, the lightweight portion 312 in accordance with this exemplary embodiment of the present invention is formed out of a lightweight composite type material that is usually formed in layers and cured to take on its final shape. Taking a closer look at the geometry, it can be seen that the lightweight portion 312, both from the frontal and rear views shown in
It should be noted that the 3D printed core is only one preferred embodiment used to form the complicated geometry in the lightweight portion 312. Numerous other types of manufacturing methods could be used without departing from the scope and content of the present invention so long as it is capable of achieving the geometry needed. One alternative manufacturing method is the utilization of an inflatable bladder. In this alternative manufacturing method, the composite material could be applied to the internal component of the metallic portion, and the internal geometry of the composite material could be formed using an inflatable bladder; wherein the entire structure may be cured before the bladder is deflated.
It is worth noting here that although the thickness of the striking face portion 518 is capable of getting so thin is mainly because of the structural support provided by the internal face support 528, the internal face support 528 also improves the feel of the golf club head 500 as well. As modern golf club faces get thinner and thinner to improve the performance of the golf club head 500, the thinner metallic striking face portion 518 can often feel too “clicky”. The internal face support 528 that is made out of the composite type material in this embodiment of the invention helps alleviate that problem by providing a more rigid and solid feel, allowing the striking face portion 518 to get achieve this thickness.
Finally, it is worth noting here that although not specifically shown in
Finally,
The lightweight portion 612 here creates a gap 617 between the internal face support 628 and the wrap around the toe weight 616. This gap 617 is important to the proper functionality of golf club head 600 because it allows the striking face 618 to flex upon impact with a golf ball. Without this very important gap 617, the performance of the golf club head 600 could be limited towards the toe portion of the golf club head 600.
The exploded view of golf club head 800 shown in
The metallic portion 810 shown in
In an alternative embodiment of the present invention, the material used to form the lightweight face portion 812a and the lightweight toe portion 812b could be different from one another without departing from the scope and content of the present invention. In one example, the lightweight toe portion 812b could be made out of chopped fiber composite, solid composite, aluminum, magnesium or even some 3D printed material all without departing from the scope and content of the present invention. One of the reason that the lightweight toe portion 812b could be made from these alternative materials is because the toe portion 804 is not generally used for impacting a golf ball, hence the stress level experienced by the golf club head at those locations are generally lower.
The lightweight portion 1112 in this embodiment may have some structural integrity to essentially provide support to various other parts of the metallic portion 1110 like the previous embodiment has shown. In fact, the lightweight portion 1112 may have an internal crown support 1122 and an internal sole support 1126 in addition to the internal face support 1128 in keeping with the spirit of the present invention. Similar to previous discussion, the incorporation of lightweight portion 1112 together with the metallic portion 1110 allows the metallic portion of the striking face 1118 to be made out of a thinner material, generating more discretionary weight that can be placed at other strategic locations in the golf club head 1100. The present embodiment distributes this discretionary weight by incorporating a large heel weight 1114 and a large toe weight 1116 that can improve the center of gravity location as well as improve the moment of inertia of the golf club head 1100. The heel weight 1114 and the toe weight 1116 are placed into a heel cavity 1146 and a toe cavity (shown in
The heel weight 1214 in accordance with this embodiment of the present invention may generally be made out of a tungsten type material having a density of greater than about 17 grams/cc yielding a mass of greater than about 12 grams, more preferably greater than about 15 grams, and most preferably greater than about 18 grams. The toe weight 1216 in accordance with this embodiment of the present invention may also be made out of a tungsten type material having a density of greater than about 17 grams/cc yielding a total mass of greater than about 15 grams, more preferably greater than about 18 grams, and most preferably greater than about 20 grams. With the oversized heel weight 1214 and the toe weight 1216, the golf club head 1200 may generally be capable of achieving a moment of inertia about the y-axis of greater than about 235 kg−mm2, more preferably greater than about 245 kg−mm2, and most preferably greater than about 255 kg−mm2.
In addition to having a metallic portion 1110, a lightweight portion 1112, a heel weight 1114, and a toe weight 1116, the embodiment of the present invention shown in
Finally, the cylindrical weight 1142 shown in
Finally,
Other than in the operating example, or unless otherwise expressly specified, all of the numerical ranges, amounts, values and percentages such as those for amounts of materials, moment of inertias, center of gravity locations, loft, draft angles, various performance ratios, and others in the aforementioned portions of the specification may be read as if prefaced by the word “about” even though the term “about” may not expressly appear in the value, amount, or range. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the above specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. Furthermore, when numerical ranges of varying scope are set forth herein, it is contemplated that any combination of these values inclusive of the recited values may be used.
It should be understood, of course, that the foregoing relates to exemplary embodiments of the present invention and that modifications may be made without departing from the spirit and scope of the invention as set forth in the following claims.
Claims
1. A metalwood golf club head comprising:
- a metallic portion further comprising a hosel, a sole portion, and a striking face, wherein said metallic portion creates an opening near a top crown portion of said metallic portion that extends into a heel portion of said metalwood golf club head,
- a lightweight portion further comprising an internal crown support, an internal sole support, and an internal face support, wherein said lightweight portion slidably engages said opening near said top crown portion of said metallic portion,
- wherein said metallic portion conceals said internal face support and said sole support, and
- wherein said internal face support contacts a rear surface of said striking face.
2. The metalwood golf club head of claim 1, wherein said striking face has a thickness of between about 1.0 mm and about 1.5 mm, and said internal face support has a thickness of between 0.8 mm and about 1.2 mm.
3. The metalwood golf club head of claim 2, wherein said striking face has a thickness of between about 1.1 mm and about 1.4 mm, and said internal face support has a thickness of between about 0.9 mm and about 1.1 mm.
4. The metalwood golf club head of claim 3, wherein said striking face has a thickness of between about 1.2 mm and about 1.4 mm, and said internal face support has a thickness of about 1.0 mm.
5. The metalwood golf club head of claim 2, further comprising a crown cover, concealing said lightweight portion.
6. The metalwood golf club head of claim 2, wherein said lightweight portion further comprises a heel cavity adapted to receive a heel weight, and a toe cavity adapted to receive a toe weight.
7. The metalwood golf club head of claim 6, further comprising a heel weight located within said heel cavity, and a toe weight located within said toe cavity.
8. The metalwood golf club head of claim 2, wherein said metallic portion is made out of a steel material having a density greater than about 7.0 g/cc and said lightweight portion is made out of a composite type material having a density less than about 3.0 g/cc.
9. The metalwood golf club head of claim 8, wherein said metallic portion is made out of a steel material having a density greater than about 7.3 g/cc and said lightweight portion is made out of a composite type material having a density less than about 2.5 g/cc.
10. The metalwood golf club head of claim 9, wherein said metallic portion is made out of a steel material having a density greater than about 7.6 g/cc and said lightweight portion is made out of a composite type material having a density less than about 2.0 g/cc.
11. The metalwood golf club head of claim 8, wherein said metalwood golf club head is a hybrid type golf club head having a loft of greater than about 17.5 degrees, and wherein said metalwood golf club head has a moment of inertia greater than about 235 kg−mm2.
12. The metalwood golf club head of claim 11, wherein said metalwood golf club head has a moment of inertia greater than about 245 kg−mm2.
13. The metalwood golf club head of claim 12, wherein said metalwood golf club head has a moment of inertia greater than about 255 kg−mm2.
14. A hybrid metalwood golf club head comprising:
- a metallic portion further comprising a hosel, a sole portion, and a striking face, wherein said metallic portion creates an opening near a top crown portion of said metallic portion that extends into a heel portion of said metalwood golf club head,
- a lightweight portion further comprising an internal crown support, an internal sole support, and an internal face support, wherein said lightweight portion slidably engages said opening near said top crown portion of said metallic portion,
- wherein said hybrid metalwood golf club head has a loft of greater than 17.5 degrees,
- wherein said hybrid metalwood golf club head has a moment of inertia greater than about 235 kg−mm2,
- wherein said metallic portion conceals said internal face support and said sole support, and
- wherein said internal face support contacts a rear surface of said striking face.
15. The hybrid metalwood golf club head of claim 14, wherein said metalwood golf club head has a moment of inertia greater than about 245 kg−mm2.
16. The hybrid metalwood golf club head of claim 15, wherein said metalwood golf club head has a moment of inertia greater than about 255 kg−mm2.
17. The hybrid metalwood golf club head of claim 14, wherein said lightweight portion further comprises a heel cavity adapted to receive a heel weight, and a toe cavity adapted to receive a toe weight, and wherein said hybrid metalwood golf club head further comprises a heel weight located within said heel cavity, and a toe weight located within said toe cavity.
18. The hybrid metalwood golf club head of claim 17, wherein said heel weight has a mass of greater than about 12 grams and said toe weight has a mass of greater than about 15 grams.
19. The hybrid metalwood golf club head of claim 18, wherein said heel weight has a mass of greater than about 15 grams and said toe weight has a mass of greater than about 18 grams.
20. The hybrid metalwood golf club head of claim 19, wherein said heel weight has a mass of greater than about 18 grams and said toe weight has a mass of greater than about 20 grams.
Type: Application
Filed: Mar 20, 2018
Publication Date: Jun 6, 2019
Applicant: Acushnet Company (Fairhaven, MA)
Inventors: Grant M. Martens (San Diego, CA), Uday V. Deshmukh (Carlsbad, CA)
Application Number: 15/926,565