Patent Publication Number: US-2019168087-A1

Title: Multi-material golf club head

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     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 INVENTION 
     The 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 INVENTION 
     In 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 INVENTION 
     One 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−mm 2 . 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. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       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. 
         FIG. 1  shows a rear perspective view of a golf club head in accordance with an exemplary embodiment of the present invention; 
         FIG. 2  shows an exploded rear perspective view of a golf club head in accordance with an exemplary embodiment of the present invention; 
         FIG. 3  shows an exploded frontal perspective view of a golf club head in accordance with an exemplary embodiment of the present invention; 
         FIG. 4  shows a cross-sectional view of a golf club head in accordance with an exemplary embodiment of the present invention taken along cross-sectional line  4 - 4 ′ shown in  FIG. 1 ; 
         FIG. 5  shows a cross-sectional view of a golf club head in accordance with an exemplary embodiment of the present invention taken along cross-sectional line  5 - 5 ′ shown in  FIG. 1 ; 
         FIG. 6  shows a cross-sectional view of a golf club head in accordance with an exemplary embodiment of the present invention taken along cross-sectional line  6 - 6 ′ shown in  FIG. 1 ; 
         FIG. 7  shows a rear perspective view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 8  shows an exploded rear perspective view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 9  shows an exploded frontal perspective view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 10  shows a frontal view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 11  shows an exploded rear perspective view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 12  shows another exploded rear perspective view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 13  shows a cross-sectional view of a golf club head in accordance with an alternative embodiment of the present invention taken along cross-sectional line  13 - 13 ′ shown in  FIG. 10 ; and 
         FIG. 14  shows a cross-sectional view of a golf club head in accordance with an alternative embodiment of the present invention taken along cross-sectional line  14 - 14 ′ shown in  FIG. 10 . 
     
    
    
     DETAILED DESCRIPTION OF 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. 
       FIG. 1  of the accompanying drawings shows a perspective view of a golf club head  100  in accordance with an exemplary embodiment of the present invention. More specifically, the golf club head  100  shown here may have a topline portion  102 , a toe portion  104 , a sole portion  106 , and a heel portion  108 . The golf club head  100  shown here may be separated into a metallic portion  110  and a lightweight portion  112  that is separated by a separation line  111 . The separation line  111  is shown in  FIG. 1  in darker and heavier lines, but should be more visible in subsequent view of the invention wherein the different components are exploded to help illustrate the separation line  111 . 
       FIG. 2  of the accompanying drawings shows an exploded perspective view of a golf club head  200  in accordance with an exemplary embodiment of the present invention allowing the relationship between the various components of the golf club head  200  to be shown more clearly. More specifically,  FIG. 2  of the accompanying drawings shows an exploded rear perspective view of the various components. First and foremost, it can be seen that golf club head  200  is comprised out of four major components, a metallic portion  210 , a lightweight portion  212 , a heel weight  214 , and a toe weight  216 . The metallic portion  210  further comprises of a striking face  218 , the topline portion  202 , the sole portion  206 , and a heel portion  208  containing the actual hosel  220 . The lightweight portion  212  in accordance with the current exemplary embodiment of the present invention may be further comprised out of the toe portion  204 , an internal topline support  222 , and internal sole support  226 , and an internal face support (shown later as  328  in  FIG. 3 ). The internal supports shown here allow the metallic portion  210  of the golf club head  200  to be made thinner wherever there is an overlap in material, increasing the discretionary weight available in the golf club head  200 . The internal support achieves this by increasing the structural integrity of the golf club head  200  at those specific locations. The extra amount of discretionary weight achieved by the utilization of internal supports allow the golf club head  200  to include a larger than average sized heel weight  214  and toe weight  216  to increase the moment of inertia of the golf club head  200 . The heel weight  214  in this embodiment of the present invention may generally be placed at a cavity created inside the bottom heel portion of the metallic portion  208 , while the toe weight  216  may generally be located inside the bottom toe portion of the lightweight portion  204 . Finally, although not specifically here, the separation line  111  shown in  FIG. 1  can be seen more clearly in this exploded view of the golf club head  200  as the separation between the metallic portion  210  and the lightweight portion  204 . 
     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  FIG. 1  creates a unique relationship between the two components. More specifically, as shown here in  FIG. 2 , the lightweight portion  212  slides into an opening created by the metallic portion  210  from the toe side after the heel weight  214  is installed in the heel portion. The lightweight portion  212  here is formed with the toe weight  216  already installed, and the entirety of the two components can be installed together in one step. The lightweight portion  212  has an exposed toe portion  204  that takes on the external shape of a golf club head  200 , but also contains internal components such as the internal topline support  222 , internal sole support  226 , and an internal face support (shown later as  328  in  FIG. 3 ). The internal components mentioned above provide internal support for the topline  202 , sole  206 , and striking face  218  of the metallic portion  210  respectively, all while preserving the external cosmetics of the exposed toe portion. It should be noted that the rear portion of the golf club head  200  is only formed by the lightweight portion  212 , and does not contain any metallic portion  210 . This design is intentional, as the rear portion of the golf club head  200  is not subjected to as high of a stress as the other portion of the golf club head  200 ; hence it does not need the structural rigidity of the metallic portion  210 . Alternatively, it can be said that the golf club head  200  comprises of a metallic portion  210  that is further comprised of a topline portion  202 , a sole portion,  206 , a striking face portion  218 , and an opening orientated towards the toe portion of the golf club head. The golf club head  200  also comprises of a lightweight portion  212  that is further comprised of a topline support portion  222 , a sole support portion  226 , and a striking face support portion (shown as  328  in  FIG. 3 ), wherein the lightweight support portion engages the opening of the metallic portion  210  such that the topline support portion  222  engages the topline portion  202 , the sole support portion  226  engages the sole portion  206 , and the striking face support portion (shown as  328  in  FIG. 3 ) engages the striking face portion  218 . Finally, it can be said that the lightweight portion  212  engages the metallic portion  210  by slidably engaging the toe opening created by the metallic portion  210 . 
     Finally,  FIG. 2  also shows an additional feature of the metallic portion  210  that helps structurally support the lightweight portion  212 . More specifically,  FIG. 2  shows that the topline portion  202  and the sole portion  206  may both have a wraparound undercut that spans the major portion of the metallic portion  210 . The wrap around undercut is created by creating a bend in the topline portion  202  and the sole portion  206  as it departs from the striking face  218  plane and wraps around the lightweight portion  212  itself until it becomes substantially planar to that same plane again. This wraparound undercut feature helps retain the lightweight portion  212  as it slides into the opening created for it within the metallic portion  210  and provides structural rigidity to the golf club head  200  itself. 
     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,  FIG. 3  of the accompanying drawings shows an exploded perspective view of a golf club head  300  in accordance with an alternative embodiment of the present invention shown from an different angle. Golf club head  300 , similar to golf club head  200  shown in  FIG. 2 , illustrates a metallic portion  310  containing a hosel  320  and a striking face  318  that is adapted to contact a golf ball. The metallic portion  310  also has a topline portion  302 , a sole portion  306 , a heel portion  308  in addition to the hosel  320  and the striking face  318 . It should be noted that in this view, the opening of the metallic portion  310  is not visible, but is still orientated towards the toe portion. The heel weight  314 , shown here to be exploded out from its position inside the bottom of the heel portion may generally be attached via any attachment means desired without departing from the scope and content of the present invention. The lightweight portion  312  in  FIG. 3  shows the striking face support portion  328  that the previous discussion has referenced being placed at a front of the lightweight portion  312  directly behind the striking face  318  to provide structural support. In addition to the above,  FIG. 3  of the accompanying drawings also shows the lightweight portion with a topline support  322 , a sole support  326 , and a toe portion  304 . Finally,  FIG. 3  also shows the toe weight  316  being extrapolated from its place near the bottom toe portion of the lightweight portion  312  for ease of illustration. As previously discussed, the toe weight  316  may be formed integrally within the lightweight portion  312  during the curing process of the composite material without departing from the scope and content of the present invention. 
     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  FIGS. 2 and 3 , illustrate a complicated geometry that has multiple cutouts and curvatures generally difficult to form using composite type materials. To achieve this type of geometry, the current invention utilizes a 3D printed core lattice that has an internal geometry that matches the desired internal geometry of the lightweight portion  312 . Once the 3D printed core lattice is created, the composite type material may be wrapped around the 3D printed core lattice and subsequently cured to take form. Once the composite material is cured, the internal 3D printed core lattice may be dissolved away to yield a hollow central portion to eliminate any unnecessary weight. However, in alternative embodiments of the present invention, the 3D printed core lattice may be preserved without departing from the scope and content of the present invention if it is suitable to improve the performance or sound of the golf club head  300  itself. 
     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. 
       FIGS. 4, 5, and 6  of the accompanying drawings shows cross-sectional views of golf club heads  400 ,  500 , and  600  respectively taken along cross-sectional lines  4 - 4 ′,  5 - 5 ′, and  6 - 6 ′ shown in  FIG. 1 .  FIG. 4  shows a cross-sectional view of a golf club head  400  in accordance with an alternative embodiment taken along cross-sectional line  4 - 4 ′ to allow the relationship between the various components to be shown more clearly. More specifically,  FIG. 4  of the accompanying drawings shows a metallic portion  410  located at a frontal portion of the golf club head  400  creating the striking face, while the lightweight portion  412  is shown here to be placed and inserted in behind the metallic portion  410 . This cross-sectional line  4 - 4 ′ is drawn across the heel weight  414  to allow the relationship between the heel weight  414  and the other components to be shown more clearly. As it can be seen here in  FIG. 4 , the heel weight  414  is completely enclosed by the metallic portion  410 , and only contacts the lightweight portion  412 , which differs from how the toe weight, which will be shown in more detail in  FIG. 6 . 
       FIG. 5  of the accompanying drawings shows a cross-sectional view of golf club head  500  in accordance with an alternative embodiment of the present invention taken along cross-sectional line  5 - 5 ′ shown in  FIG. 1 . This cross-sectional line taken down the middle of the golf club head  500  allows the various thicknesses of the components at the center of the golf club head  500  to be defined. More specifically the thickness that we are concerned with here are the thickness of the metallic portion  510  at the striking face portion  518  and the lightweight portion  512  at the internal face support  528 . The thickness of the metallic portion  510  at the striking face portion  518  is represented by D 1  in  FIG. 5 , while the thickness of the lightweight portion  512  at the internal face support  528  is represented by D 2 . Thickness D 1  of the striking face portion  518  in accordance with the current exemplary embodiment may generally be between about 1.0 mm and about 1.5 mm, more preferably between about 1.1 mm and about 1.4 mm, and most preferably between about 1.2 mm and about 1.4 mm all without departing from the scope and content of the present invention. The thickness D 2  of the internal face support  528 , on the other hand, may have a thickness of between about 0.8 mm and about 1.2 mm, more preferably between about 0.9 mm and about 1.1 mm, and most preferably about 1.0 mm all without departing from the scope and content of the present invention. The thickness of the striking face portion  518  and the internal face support  528  are critical to the proper functionality of the current inventive golf club head  500 . If the thickness of the striking face is too thick, then the ballspeed performance of the golf club head  500  suffers in addition to wasting weight. On the other hand, if the thickness of the striking face is too thin, then durability of the golf club head  500  suffers. However, the lack of durability can be alleviated by the addition of the internal face support  528 , thus the combination and the right balance of the various thicknesses is of the utmost importance to the present invention. 
     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  FIG. 5 , there could potentially be a viscoelastic layer sandwiched between the striking face portion  518  and the internal face support  528 . The viscoelastic layer could be made out of a viscoelastic tape, a viscoelastic fluid, or any other viscoelastic composition capable of taking up any gaps between the striking face portion  518  and the internal face support  528  that could result from manufacturing tolerance. 
     Finally,  FIG. 6  of the accompanying drawing shows a cross-sectional view of golf club head  600  in accordance with an alternative embodiment of the present invention taken along cross-sectional line  6 - 6 ′ shown in  FIG. 1 . This cross-sectional view taken along the toe weight  616  allows the relationship of the toe weight  616  with the other components to be shown more clearly. More specifically  FIG. 6  shows that the toe weight  616  is generally completely captured and retained by the lightweight portion  612 . The lightweight portion  612  captures the toe weight  616  by curing itself around the toe weight  616  while the lightweight portion  612  is still in the uncured state. This type of co-forming technique allows the toe weight  616  to be pre-incorporated into the lightweight portion  612 , simplifying the final assembly process. 
     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 . 
       FIG. 7  of the accompanying drawings shows a golf club head  700  in accordance with an alternative embodiment of the present invention. Although the final assembled product may not look very different than the golf club head  100  shown in  FIG. 1 , the subtle differences will be evident in the subsequent discussion. More specifically, the lightweight portion  712  in this embodiment may be created using multiple pieces to further simplify the manufacturing method.  FIG. 7  shows the golf club head  700  having a topline portion  702 , a toe portion  704 , a sole portion  706 , and a heel portion  708 . The golf club head  700  shown here may be separated into a metallic portion  710  and a lightweight portion  712  that is separated by a separation line  711 . 
     The exploded view of golf club head  800  shown in  FIG. 8  provides more detail for alternative embodiment of the present invention. Although there are a lot of components shown in this exploded view of the invention shown in  FIG. 8 , it differs from the previous embodiment in that the lightweight portion  812  is further separated into sub-components lightweight face portion  812   a  and lightweight toe portion  812   b . The separation of the lightweight portion  812  into sub-components could potentially make the manufacturing of the lightweight portion  812  easier due to manufacturing constraints of the composite material that involved composite material. By separating the lightweight portion  812  into the lightweight face portion  812   a  and the lightweight toe portion  812   b , it allows the lightweight face portion  812   a  to be created by using unitary plies of composite material that can be wrapped around a core material that can be extracted later without worrying about complex geometries. The formation of the lightweight toe portion  812   b  requires more complex formation techniques, but the stress level experienced at the lightweight toe portion  812   b  is significantly lower, thus numerous types of manufacturing techniques could be used instead that does not need to accommodate high levels of stress. 
     The metallic portion  810  shown in  FIG. 8  is similar to previous discussions, and further comprises of a topline portion  802 , a sole portion  806 , a heel portion  808 , a hosel  820 , and a striking face portion  818 . The heel weight  814  is inserted into the metallic portion  810  at the bottom heel portion of the golf club head  800  similar to the previously illustrated embodiments. The lightweight portion  812  in this embodiment, as previously discussed, is separated into two sub-components, the lightweight face portion  812   a  and the lightweight toe portion  812   b . The lightweight face portion  812   a  comprises a topline support  822 , a sole support  826 , and an internal face support  828 , and these support regions can provide structural support to the metallic portion  810 . The lightweight toe portion  812   b  further comprises a toe portion  804  that will be externally visible once the golf club head  800  is completely assembled. The toe weight  816  in this embodiment can be easily inserted into an opening (not shown) in the lightweight toe portion  812   b , and then assembled together with the lightweight face portion  812   a  to create the entire lightweight portion  812 . Finally, it is worth noting here that in order to help the assembly between the lightweight face portion  812   a  and the lightweight toe portion  812   b , a snap assembly is created using a tab  832  on the lightweight toe portion  812   b  and a snap opening  830  on the lightweight face portion  812   a.    
     In an alternative embodiment of the present invention, the material used to form the lightweight face portion  812   a  and the lightweight toe portion  812   b  could be different from one another without departing from the scope and content of the present invention. In one example, the lightweight toe portion  812   b  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  812   b  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. 
       FIG. 9  of the accompanying drawings shows a frontal exploded view of a golf club head  900  in accordance with an alternative embodiment of the present invention. In this exploded frontal view additional features that were previously not visible from the rear view can be shown more clearly. More specifically,  FIG. 9  of the accompanying drawings shows the lightweight toe portion  912   b  may further contain a cavity  934  to allow the toe weight  916  to be incorporated into the golf club head without the need for complicated forming techniques previously discussed. In addition to showing the cavity  934 ,  FIG. 9  of the accompanying drawings still shows some of the basic components originally shown.  FIG. 9  shows a golf club head  900  being separated into two major components, a metallic portion  910  and a lightweight portion  912 . The metallic portion  910  further comprises a topline portion  902  a sole portion  906 , a heel portion  908 , a hosel  920 , and a striking face  918 . The metallic portion  910  is created to allow a heel weight  914  to be inserted into the bottom heel portion of the golf club head  900 . The lightweight portion  912 , as shown in this current embodiment, can be separated into a lightweight face portion  912   a  and a lightweight toe portion  912   b  similar to the previous embodiment. The lightweight face portion  912   a  has a face support  928  that support the rear portion of the striking face  918 . 
       FIG. 10  of the accompanying drawings shows a frontal view of a metalwood type golf club head incorporating the similar technology shown in  FIGS. 1 through 9  with a metallic portion that forms a frontal portion of the golf club head and a lightweight portion that forms the rear face support for the striking face of the golf club head  1000 . In order to illustrate more detail regarding this relationship, an exploded rear view of this golf club head  1000  is shown in more detail in subsequent figures. 
       FIG. 11  of the accompanying drawings shows a rear exploded perspective view of a golf club head  1100  in accordance with an alternative embodiment of the present invention. More specifically, this embodiment of the present invention shown in  FIG. 11  illustrates a hybrid type golf club head  1100 , but the same technology could be applied to other types of metalwood type golf club head as well such as fairway woods or drivers all without departing from the scope and content of the present invention.  FIG. 11  shows a hybrid type golf club head  1100  having a metallic portion  1110  that contains the striking face  1118  located at a frontal portion of the golf club head  1100 , a hosel portion, a crown portion, a toe portion, a heel portion, and a sole portion  1102 . The golf club head  1100  shown in  FIG. 11  also shows a lightweight portion  1112  providing support to the metallic portion  1110 , especially behind the striking face  1118  via the internal face support  1128 . The golf club head  1100  does this by creating an opening  1119  at the rear crown portion of the golf club head  1100  that extends onto the heel side of the golf club head  1100  to allow easy access for the lightweight portion  1112  to be inserted into the opening  1119 . In this embodiment of the present invention, the hybrid type golf club head may generally have a loft of greater than about 17.5 degrees, more preferably greater than about 18 degrees, and most preferably greater than about 19 degrees. 
     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  FIG. 12  as  1248 ) respectively within the lightweight portion  1112  without departing from the scope and content of the present invention. 
     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−mm 2 , more preferably greater than about 245 kg−mm 2 , and most preferably greater than about 255 kg−mm 2 . 
     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  FIG. 11  also shows two new unique features that are more applicable to metalwood type golf club head constructions, the crown cover  1140  and a cylindrical weighting member  1142 . More specifically,  FIG. 11  also shows a crown cover  1140  that covers the opening in the metallic portion  1110  that is created to accept the lightweight portion  1112 . The opening allows the lightweight portion  1112  to be slidably inserted into the metallic portion  1110  from an angled toe orientation, and subsequently covered by a crown cover  1140  to create an aesthetically pleasing finished product. 
     Finally, the cylindrical weight  1142  shown in  FIG. 11  provides an additional added weighting member that allows for further adjustment of the center of gravity location of the golf club head  1100  to further improve upon the performance of the golf club head  1100 . More information regarding the cylindrical weight may be found in U.S. Patent Publication No. 2017/0354852, filed on Aug. 28, 2017 as well as U.S. Patent Publication No. 2017/0252614, filed on May 18, 2017, the disclosure of which are both incorporated by reference in their entirety. 
       FIG. 12  of the accompanying drawings provide another exploded rear perspective view of a golf club head  1200  in accordance with an alternative embodiment of the present invention. This view of the golf club head  1200  shows the toe cavity  1248  more clearly, indicating that the heel weight  1214  and the toe weight  1216  fit into the lightweight member  1212  before they are inserted into the metallic portion  1210 . Once the two above mentioned pieces are assembled together, the cylindrical weight  1242  is then subsequently inserted into the opening created by the combination of the metallic portion  1210  and the lightweight portion  1212 . Finally, the crown cover  1240  is attached to the top of the crown support region of the lightweight portion  1212 . It is worthwhile to note here while previous embodiments of the present invention involving iron type golf club heads do not require a separate component to cover up the lightweight portion  112  (shown in  FIG. 1 ), the embodiment shown here involving metalwood type construction requires the additional component of a crown cover  1240 . The requirement of this additional piece of a crown cover  1240  is to create a larger opening near the rear of the metallic portion to allow the lightweight portion  1212  to slide into position. The utilization of a crown cover  1240  in this embodiment covers the oversized hole created in the metallic portion  1210  to create a seamless look. Finally,  FIG. 12  also shows the striking face  1218  being supported by the internal face support  1228  like in previous embodiments. 
       FIG. 13  of the accompanying drawings shows a cross-sectional view of a golf club head  1300  in accordance with an alternative embodiment of the present invention taken along cross-sectional line  13 - 13 ′ shown in  FIG. 10 . In additional to showing the relationship between the various components such as the metallic portion  1310  containing a striking face  1318  that is supported by the internal face support  1328  of the lightweight portion  1312 ,  FIG. 13  also shows how the crown cover  1340  works to cover up the oversized opening created by the metallic portion  1310  to create a seamless looking golf club head  1300 . However, this cross-sectional view of golf club head  1300  also allow the various thickness of the important striking face portion  1318  and the internal face support  1328  to provide more contact about how this new dual material construction allows a reduction in thickness and weight of these components. More specifically, the striking face portion  1318  in accordance with this embodiment of the present invention may have a thickness D 3  of between about 1.0 mm and about 1.5 mm, more preferably between about 1.1 mm and about 1.4 mm, and most preferably between about 1.2 mm and about 1.4 mm all without departing from the scope and content of the present invention. The thickness D 4  of the internal face support  1328 , on the other hand, may have a thickness of between about 0.8 mm and about 1.2 mm, more preferably between about 0.9 mm and about 1.1 mm, and most preferably about 1.0 mm all without departing from the scope and content of the present invention. 
     Finally,  FIG. 14  of the accompanying drawings shows another cross-sectional view of a golf club head  1400  in accordance with an alternative embodiment of the present invention taken along cross-sectional line  14 - 14 ′ shown in  FIG. 10 . This cross-sectional view of the golf club head  1400  shown in  FIG. 14  allows the heel weight  1414  and the toe weight  1416  and their location relative to the remainder of the golf club had  1400  to be shown more clearly. More specifically,  FIG. 14  shows the metallic portion  1410  works in conjunction with the lightweight insert  1412  to capture the heel weight  1414  and the toe weight  1416 . Moreover, the cylindrical weight  1442  is also captured by the lightweight portion  1412 . 
     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.