Patent Grant
8480514
The present invention relates generally to a golf club head having an improved face insert. More specifically, the present invention relates to a golf club head with a face insert that improves the performance of the golf club head by removing unnecessary weight near the top surface of the face insert while preserving the structural integrity of the face insert near the bottom surface of the face insert, where the golf club head impacts a golf ball. The face insert disclosed by the present invention may generally have a cavity beginning near a top surface of the face insert that extends vertically into the body of the face insert terminating short of the bottom surface of the face insert; wherein the cavity may be filled with a secondary material having a second density lower than the first density of the first material used to construct the remainder of the face insert.
In order to improve the performance of a golf club, golf club designers constantly struggle with ways to design a golf club that could hit a golf ball longer and straighter. Despite all the benefit generally associated with being able to hit a golf ball the longer, most golfers will agree that it is the ability to hit a golf ball straighter that most dramatically increases a golfer's ability to obtain a low score. Hence, in order to hit a golf ball straighter, golf club designers have struggled with the ability of a golf club to produce a relatively straight flight even when the golf ball is not struck at the center of the golf club head; as a golf ball struck at the center of the face of the golf club head tends to already have a relatively straight flight path. In order to design a golf club that tends to be more forgiving on off-center hits, the Center of Gravity (CG) location of the golf club head as well as the Moment of Inertia (MOI) are often two of the most important factors that can help achieve such a straighter flight.
Although numerous methods can be used to improve the CG and MOI of a golf club head, one of the most effective ways to improve such a performance is by removing weight from unnecessary areas of the golf club head and placing it at alternative locations within the golf club head. U.S. Pat. No. 5,407,202 to Igarashi ('202 Patent) gives one example of such an attempt by disclosing a golf club head having a face insert that is made of a high strength lightweight metals such as titanium, allowing the weight saved to be distributed around the perimeter of the golf club head to improve the MOI of the golf club head.
U.S. Pat. No. 5,405,137 to Vincent et al. ('137 Patent) further demonstrates the applicability of this concept into a metal wood type golf club head to increase the performance of such a metal wood type golf club head. More specifically, the '137 Patent discloses a golf club head comprising a body and a face insert that is positioned in a recess provided on the front part of the body, wherein the recess comprises of a plurality of abutments so as to create a stable support for the insert in the recess.
In an alternative situation, U.S. Pat. No. 6,814,674 to Clausen et al. ('674 Patent) shows how a face insert could be used in a iron type golf club head to improve the performance of a golf club head. More specifically, the '674 Patent discloses an iron type golf club head composed of three main components: a periphery member, a central member, and a face plate; wherein the iron type golf club head has a high moment of inertia.
Despite all the advancements in incorporating a face insert within a golf club head to improve the performance of a golf club head, the current art fails to truly maximize the opportunity to manipulate the composition and geometry of the face insert itself to further improve the performance of the golf club head. Even though replacing the striking face of the golf club with a face insert with a different insert that is constructed out of a lighter material will allow for significant weight savings, further weight savings and optimization of weight location could be accomplished by adjusting composition and geometry of the face insert itself.
U.S. Pat. No. 5,766,094 to Mahaffey et al. ('094 Patent) discloses an example of an early attempt to improve the performance of a golf club head by reducing unnecessary weight within the face insert itself. However, the method disclosed in '094 Patent may not be optimal as it uniformly removes weight from the face insert by creating cavity throughout the entire face insert itself. Uniformly moving weight from a face insert is undesirable because it fails to consider the strength and durability needs of the face insert itself. Because the face insert of a golf club head is the portion of the golf club head that is subjected to the most stress, sacrificing strength and durability at such a location may generally be an undesirable solution to save weight.
Hence, as it can be seen from above, despite all the advancement in golf club technology, the current art has been unable to sufficiently improve upon the performance advantages achievable by utilizing a face insert within a golf club head. Furthermore, the current art's attempt to improve upon the performance of a golf club head by focusing on the face insert itself is undesirable because it does so by uniformly taking away material within the face insert itself at the expense of sacrificing strength and durability. Ultimately, it can be seen from above that there is a need in the art to further improve upon the performance of a golf club head by focusing on improving the face insert without sacrificing the strength and durability of such a face insert.
One aspect of the present invention is a golf club head comprising a face insert located at a frontal portion of the golf club head for striking a golf ball together with a body located at an aft portion of the golf club head. The body portion has a recessed portion wherein the recessed portion delimits the face insert such that the face insert rests within the recessed portion of the body. The face insert further comprises a core member and a cavity. The cavity is located at the top surface of the face insert extending into the face insert towards the bottom surface of the face insert, terminating short of the bottom surface.
In another aspect of the present invention is a golf club head comprising a body located at an aft portion of the golf club head having a recessed portion near a frontal portion of the body, and a face insert being of a similar size and shape to said recessed portion connected to the body within the recessed portion. The face insert further comprises a core member and a filler member. The core member, made out of a first material, has a cavity near a top surface of the face insert; while the filler member, made out of a second material, fills in the cavity of the core member. The first material has a first density and the second material has a second density, wherein the second density is lower than the first density.
In a further aspect of the present invention is a set of iron-type golf clubs comprising a first golf club head and a second golf club head. The first golf club head has a first loft wherein the first golf club head further comprises a first face insert having a first density, wherein the first cavity has a first volume. The second golf club head has a second loft wherein the second golf club head further comprises a second face insert having a second density, wherein the second cavity has a second volume. The first loft is greater than the second loft and the second volume is greater than the first volume.
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.
a shows an cross-sectional view of a golf club head having a loft α in accordance with an exemplary embodiment of the present invention taken along the middle of the golf club head;
b shows an cross-sectional view of a golf club head having a loft β in accordance with an exemplary embodiment of the present invention taken along the middle of the golf club head;
c shows an cross-sectional view of a golf club head having a loft Φ in accordance with an exemplary embodiment of the present invention taken along the middle of the golf club head;
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.
Although the perspective view of the golf club head 100 shown in
The exploded view of golf club head 200 shown in
In order to provide a clearer view of the relationship between the core member 310 and the cavity 312 of the face insert 302,
In order to quantify the bifurcation of the face insert 402 into the core member 410 and the cavity 412, a relative thickness ratio is created to determine that is derived from the relative thicknesses of the core member 410 to the cavity 412. More specifically, the relative thickness ratio may be defined as the thickness of the cavity 412 divided by the thickness of the core member 410 at a distance d1 of ½ an inch away from the top surface 424 of the golf club head shown below in Eq. (1):
In one exemplary embodiment of the present invention, the face insert 402 of the golf club head may have a thickness ratio of greater than about 0.20 and less than about 0.80, more preferably greater than about 0.30 and less than about 0.80, and most preferably greater than about 0.40 and less than about 0.80.
Although the thickness ratio discussed above may shed an insight on the amount of weight that can be removed from the cavity 412 of the face insert 402, it may also help in quantifying the size and shape of the cavity 412. More specifically, the cavity 412 shown in this embodiment of the present invention may generally be the thickest near the top surface 424, while constantly decreasing in thickness as it gets closer to the bottom surface 426. Alternatively speaking, the thickness ratio of the face insert 402 is the highest near the top surface 424 and the thickness ratio of the face insert 402 changes and decreases from the top surface 424 towards the bottom surface 426. It should also be noted that in this exemplary embodiment of the present invention, the thickness ratio of the face insert 402 may decreases linearly starting from said top surface 424 towards said bottom surface 426 to smooth transition the change in the thickness ratio.
Although the cavity 412 shown in
Because the first material may generally need to strong enough to withstand the impact forces with a golf ball, the first material may generally have a higher density, while the second material used to remove weight near the top surface 524 of the face insert may generally have a lower density. More specifically, the first material, as disclosed in this current exemplary embodiment, may generally be steel or titanium for its strength and durability characteristics; however, numerous other materials may be used so long as it provides sufficient strength to withstand the impact forces with a golf ball all without departing from the scope and content of the present invention. The second material used to create the filler member 513 within the cavity 512, on the other hand, may generally be a composite type material, an aluminum type material, a rubber type material, a plastic type material, or any other type of material that has a lower density than the first material without departing from the scope and content of the present invention. This filler member 513, in addition to provide significant weight savings, could also provide additional benefit that could also provide vibration dampening characteristics without departing from the scope and content of the present invention.
a, 6b, and 6c of the accompanying drawings show cross-sectional views of a plurality of golf club head included in a set of irons in accordance with an alternative embodiment of the present invention. More specifically,
For example, the long iron golf club 630 shown in
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.
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