GOLF CLUB WITH VERTICALLY ADJUSTABLE CENTER OF GRAVITY
The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity in a vertical direction. Changing a center of gravity in the vertical direction can be done without substantially changing the center of a gravity in other directions.
This application is a non-provisional of 61/655,669 filed Jun. 5, 2012, the contents of which are incorporated by reference.
FIELD OF THE INVENTIONThe invention generally relates to golf clubs with adjustable mass properties.
BACKGROUNDWhen a golfer hits a golf ball, he would like for the ball to go a great distance. The total distance the ball travels is influenced by initial conditions such as ball speed, launch angle, and spin. Every golfer hits uniquely, and to get the best distance, each golfer must strive for that combination of launch angle, ball speed, and spin that produces the greatest carry distance. A golfer can influence those initial conditions by changing their club head speed, their stroke, or their golf club. For example, all other things being equal, using a golf club with a higher loft will produce a higher launch angle.
Unfortunately, changing a golf club to optimize one of those initial conditions can compromise others. For example, a golfer who starts using a driver with a certain loft to obtain just the right launch angle may find that their ball launches with too much spin. Changing the loft angle to control the spin then compromises the launch angle. As such, the golfer may have to settle for a loft angle that reflects a least-objectionable compromise in which neither the launch angle nor the spin is wrong, but neither is just right.
SUMMARYThe invention provides a golf club head with a mechanism that can be operated to adjust a height of a club head center of gravity, allowing initial conditions such as spin and launch angle to be adjusted independently of one another. A golfer can have a club head with a loft angle that optimizes spin and then can raise or lower the center of gravity of the club head to decrease or increase, respectively, the launch angle. A club head in which the location of the center of gravity can be adjusted in a direction with a component that is vertical when the club head is at address may uncouple spin and launch angle. Since a golfer may control initial conditions of ball flight independently of one another due to the fact that they are uncoupled, the golfer may optimize those initial conditions to get the combination that produces the greatest carry distance. Thus using a club head of the invention, when the golfer hits a ball, the ball will go a great distance.
The invention includes the insights that adjusting physical parameters of a club head can influence initial ball flight conditions in various ways. While different golfers may get their own unique results from a club head, it may be found for some golfers that lowering the center of gravity can increase launch angle, increasing loft may increase spin, distance is highest at a certain medium-high spin rate, or a combination thereof.
Adjusting the center of gravity in the vertical direction solves problems presented by one-size-fits-all clubs. A golfer who needs a more forgiving club can lower the center of gravity while a golfer who desires greater distance can raise the center of gravity. One insight of the invention is that, in one club, all other things being equal, a high center of gravity aids in making a shot that bores forward. A low center of gravity tends to impart high loft to a ball. Some players find that golf club head with a low center of gravity is more forgiving to off-center hits. While some very skilled players prefer a high center of gravity because they find they can make shots with great distance. The application of this insight is in the provision of golf clubs that include a mechanism by which to adjust a center of gravity in a vertical direction when a club is at address.
An unexpected benefit of the invention is that by providing a mechanism that allows for the adjustment of center of gravity in the vertical direction, a golf club can include a mechanism that can accommodate unwanted changes that result from adjusting some other property of the club head, such as moment of inertia, loft angle, face angle, heel-toe center of gravity, or face-back center of gravity.
Further, mechanisms are provided that allow a club to have a varied center of gravity without requiring separate manufacturing of manufacturing tools. Since a single club head form factor can be manufactured that provides varied centers of gravity, production costs and times are reduced even where club makers want to provide a variety of clubs with different vertical centers of gravity.
In certain aspects, the invention provides a golf club head having a face, a hosel, and an aft body, and further includes a mechanism operable to change a position of a center of gravity of the club head in a direction that has a substantial component that is vertical when the club head is at address. The mechanism may include an openable cap (e.g., to provide access to weight ports, or a non-uniformly weighed cap that can be opened and closed back in different orientation); a reversible member (e.g., such as a strap, dowel, or screw that has a non-uniform density along its length); or a separable cartridge member (e.g., non-uniformly weighted and loadable in different orientations, with ports for weights, interchangeable with other such cartridges, or a combination thereof). The mechanism may operate by including repositionable weights, a non-uniformly weighted member, a track for weight travel, or other features. In some embodiments, the mechanism comprises weights accessible at an exterior surface of a club head. In certain embodiments, the mechanism is substantially concealed within the club head. Alternatively, the mechanism could be both accessible at an exterior surface and substantially contained within the club head.
In related aspects, the invention provides a golf club head that includes a mechanism for adjusting a center of gravity in a vertical direction without substantially changing the center of a gravity in a direction orthogonal to the vertical direction. The mechanism may use a separable member that can be attached to the club head in at least two different orientations. In some embodiments, the club head includes a separable bent strap that can be attached in a corresponding recess in an aft portion of the club head. The mechanism may include numerous ports that each receive and retain a weight (e.g., accessible from an outer surface or by opening a single hatch on the club head). Alternatively or additionally, the mechanism can use an aft portion of the club head that is moveable relative to the rest of the club head.
In certain embodiments, the invention provides an internal elevator that includes a threaded shaft, rotation of which changes a height of the center of gravity substantially only in the vertical direction.
In some embodiments, a hole in a surface of the club head is configured to receive a weight pylon (e.g., one of a set) that attaches to the surface and positions a weight member within the club head spaced away from the surface.
Aspects of the invention provide a method for changing a vertical center of gravity of a golf club head by adjusting a center of gravity in a golf club head in a vertical direction without substantially changing the center of gravity in a direction orthogonal to the vertical direction.
The method may include repositioning a separable member (a separable member that can be attached to the club head in at least two different orientations; a separable member with a non-uniform mass distribution; a separable member that can be attached to the club head in a corresponding recess in an aft portion of the club head; a separable member with a tab on one end dimensioned to be received by a slot on the club head; a separable member that can be attached to the club head in two orientations related by a 180° rotation of the separable member, or a threaded member).
In certain aspects, the invention provides a golf club head with a mechanism for adjusting a center of gravity in a vertical direction. Changing a center of gravity in the vertical direction can be done without substantially changing the center of a gravity in other directions. Clubs included in the invention include all types (e.g., putters, irons, woods, hybrids, drivers, and wedges). The mechanism can operate according to a variety of principles and can include a mechanistic device such as a hinge, truss, spoke, door, port, pylon, separable member, or repositionable weight.
In certain embodiments, a club head is provided with a separable member that can be mounted on the club head in more than one position (e.g., rotated 180°) or that can be replaced with another member having a similar shape but different mass properties. If the separable member has a non-uniform weight distribution, mounting it in a different orientation can change a center of gravity in a vertical direction. In some embodiments, a separable member can be attached to the club head in a corresponding recess in an aft portion of the club head.
In certain embodiments, a mechanism involves a threaded member (e.g., a removable rod with a non-uniform weight distribution or an elevator mechanism). Elevator mechanisms may include a threaded member configured to rotate to cause the weight member to change position in a vertical direction within the club head. In certain embodiments, an elevator mechanism comprises a threaded member and a post member that extend through a weight member.
In some embodiments, a club head includes a door that can be opened or closed and/or a port adapted to receive a weight (e.g., one or more ports dimensioned to receive weights can be provided within or behind the door). The door can be provided, for example, as an aft portion of a club head.
In certain aspects, the invention provides a kit for adjusting a center of gravity that includes two members, each of which is adapted to be attached to a club head. In some embodiments, each of the two members has a non-uniform mass distribution, each of the two members has a mass distribution different from the other, or both. Other features provided by the members in various embodiments include threaded surfaces, truss-mountable weights, and interchangeable pylons.
A kit can further include printed matter such as, for example, information about center of gravity in golf clubs, tools for interchanging the members, or both.
In certain aspects, the invention provides a method for changing a vertical center of gravity of a golf club head. Methods may include adjusting a center of gravity in a golf club head in a vertical direction without substantially changing the center of gravity in a direction orthogonal to the vertical direction. Methods may further include use of any of the embodiments described herein.
In certain aspects, the invention provides a method of providing golf clubs by obtaining two or more golf clubs that are substantially the same and that are configured so a center of gravity of each golf club can be independently adjusted in a vertical direction optionally without substantially changing the center of gravity in a direction orthogonal to the vertical. The golf clubs can be provided, for example, to a retail store or to an end-user (e.g., customer golfer). Methods of the invention allow a greater variety of clubs to be provided through commercial distribution channels without requiring a dedicated manufacturing process for each club with a unique center of gravity.
The invention provides methods and mechanisms for adjusting a center of gravity of a golf club head. As used herein throughout, reference to a direction or orientation of a center of gravity, such as vertical, is made with reference to a club head at address. The invention further provides golf club heads with a center of gravity that is adjustable in a vertical direction. In certain embodiments, a golf club head of the invention has a center of gravity that can be adjusted in a vertical direction without simultaneously substantially changing the center of gravity in a direction orthogonal to the vertical direction.
As shown in
The body of club head 1, member 3, or any other club head or member disclosed herein, can include any suitable materials known in the art such as a metal (e.g., titanium, aluminum, stainless steel) or a plastic, a polymer, or a composite (e.g., carbon fiber, various hard plastics, etc.). Member 3 can couple to club head 1 in any suitable way such as, for example, a screw, a snap-together construction, or an adhesive. In some embodiments, member 3 includes one or more pins protruding from a forward-facing (when club at address) surface and club head 1 includes corresponding holes. The arrangement of pins and holes is symmetrical in the vertical direction (i.e., across a horizontal line). Member 3 is mated to and fixed on club head 1 by pushing the pins into the holes.
Member 3 in
In some embodiments, a port 11 is only visible and only accessible from an inside surface of cap 15. In certain embodiments, port 11 are open to, and accessible from, an inside surface of cap 15, but further include a viewing window so that a golfer may see which of port 11 are occupied. A viewing window can include an open void space dimensioned so that weight members do not fall out or can include a clear material (such as a plastic or other polymer like poly(methyl methacrylate), polyvinyl chloride, PDMS, etc.).
In some embodiments, one or more of port 11 are open to, and accessible from, an outside surface of cap 15.
A golfer can remove cap 15 from club head 4, as shown in
A cap may be taken to refer to a cover or panel that cooperates with a remainder of a club head to provide an overall shape of the club head. For example, FIGS. 9 and 11A-11C depict a cap on an aft end of a club head;
In some embodiments, the invention provides a club head with a center of gravity that is adjustable in a vertical direction based on one or more repositionable weight inserts fixably connectable to the club head.
Club head 60 can further be provided with “blanks” —cosmetic cover pieces that take the place of a weight insert to give club head 60 a finished appearance without substantially affecting a mass distribution.
In some embodiments as pictured in
In alternative embodiments, cap member 105, base member 121, and bar 109 are fixed together with no motion possible between or among them. Shaft 125 is rotatably mounted as shown in
Mechanisms like the one pictured in
In some embodiments, hole 141 includes one or more of a set hole 143 configured to match to mounting mechanism 157 on a base of a pylon. Mounting mechanism 157 can include a hole and a screw that threads through the pylon into hole 143. In certain embodiments, mounting mechanism 157 on a pylon is a barbed pointer that clips through hole 143.
One benefit of the mechanism for adjusting vertical center of gravity as shown in
In some embodiments, threaded member 181 is generally made to include a low or neutral density material such as a plastic or a composite. In certain embodiment, to facilitate insertion or removal of member 181, it includes a low-friction material such as a polymer like PTFE. Positioning member 181 in club head 160 can adjust a center of gravity of the club head in a vertical direction. For example, member 181 can include a weight mass 185 located at an off-center position. A golfer can mount member 181 in club head 160 in either orientation to change a vertical center of gravity. Further, a club head 160 can be provided with one of or a set of member 181. In a set, each of member 181 can include different mass distribution properties. For example, weight mass 185 can be progressively more distant from a center of member 181 within members of a set.
Member 181 can further include a mechanism to aid in insertion or removal. In certain embodiments, member 181 includes a screwing slot 177 that allows for rotating member 181 about an axis through the use of a tool. In some embodiments, slot 177 is dimensioned to receive an edge of a coin, such as a nickel or penny.
Club head 190 includes a center of gravity that is adjustable in a vertical direction. In some embodiments, high port 205 and low port 209 are provided as recesses in door 201 (e.g., on an inside surface so that they are not visible when club head 190 is in a closed configuration). One or more weight members may be provided that mount in any of the ports. A weight member may be retained in a port by any suitable method. Suitable methods for retaining a weight member in a port include: dimensioning the weight and club head so that a back of the body member 191 holds the weight in place when club head 190 is in a closed configuration; adhesives; magnets (e.g., high powered magnets such as rare earth elements); a press-fit construction; a snap fit construction; one or more of a screw or similar fastener; spot-welding; or other similar methods.
By repositioning weight members among the ports depicted in
In certain embodiments, member 229 is a separable cartridge with ports 209 (e.g., as shown in
In certain embodiments, member 229 includes an indicator window (e.g., positioned off-center) in a position to correspond to indicia printed on club head 220 to indicate a presently effective mass property setting. Suitable setting indicator windows are disclosed in U.S. patent application Ser. No. 13/363,886, filed Feb. 1, 2012, and titled SETTING INDICATOR FOR GOLF CLUB, the contents of which are hereby incorporated by reference in their entirety.
Member 229 can be attached to club head 220 as shown by arrow F in
Club head 220 generally includes a recess for receiving member 229. One or more of pocket 241 is separated by bridge 245. In some embodiments, bridge 245 and member 229 include a ferromagnetic material, at least one of which is a permanent magnet (i.e., magnetized). In some embodiments, either or both use a strong magnet such as a rare earth element magnet.
One or more of truss element 252 can include one more of weight 257 repositionably mounted thereon. In some embodiments, weight 257 slides a long a length of truss element 252. In some elements, weight 257 can be separated from, and reattached to, truss element 252. Weight 257 can be fixed into position on truss member 252 by any suitable means, such as a clamp-on mechanism, a set-screw, or other means.
In certain embodiments, weight members 345 slide into or out of receiving wells 347. Since this attachment is not threaded, weight members 345 and wells 347 need not be circular. Thus, the weight provided by members 345 can be concentrated into certain locations (e.g., close to a fore-aft plane) and thus using weight members 345 need not substantially influence mass distribution properties of club head 341 other than a vertical position of a center of gravity of club head 341. Club head 341 may be provided with a plurality of weight members 345, such as two, or three, or seven, or twenty, or any number—so that a golfer can personalize their golf club.
In certain embodiments, cartridge 425 includes a tool engagement surface 437. Cartridge 425 and receiving chamber 445 may interact through a combination of tabs 431 and slots 451 (which may each be on either of cartridge 425 and receiving chamber 445). Club head 441 can be caused to have a center of gravity with a different height when the club head is at address by removing and interchanging slugs 429 in cartridge 425.
In certain aspects, the invention provides a cavity-backed wood-type club head that employs a surface of the club head that has a vertical component when the club head is at address.
Club head 461 includes a slot 471 in cavity 467 oriented to include a component that is substantially vertical when club head 461 is at address. Club head 461 includes slider 473 that can be repositioned along slot 471 to adjust a height of a center of gravity of club head 461. Slider 473 may include a tool engagement surface that requires a tool to slide the slider (e.g., most of slider 473 is within club head 461 and only a portion of slider 473 is accessible through slot 471, that portion bearing a special feature for engagement with a special tool).
A slot and slider (e.g., as shown in
Slider 511 may be linked to member 519 via linkage arm 523, which may preferably include a material with some stiffness and optionally stiffness with just a bit of pliability, such as a metal (like aluminum or titanium) or a plastic or other polymer (e.g., TEFLON). Track 515 may be rigid and may have a form for extra strength, such as a cross-sectional I-beam profile. Track 515 may be disposed in club head 501 with a desired positioning such as predominantly up-and-down or angled. As shown in
It may be found that changing the position of the center of gravity of the golf club head for different golf clubs may compensate for the swing characteristics of certain golfers so as to optimize initial ball flight conditions. For example, increasing loft may increase launch angle, decreasing total distance. So, a golfer may want a low-loft club head. However, a golfer may find that a high spin increases distance, so the golfer may want a club head with a high center of gravity. While every different golfer is unique, some may find that the ideal driver is one in which a point on the face directly in line with a club head center of gravity is also the point on the face which has the correct loft angle to generate the golfer's optimum launch angle. Such a golfer may procure a driver of the invention with a given loft angle and strike point and adjust the center of gravity accordingly.
A mechanism for adjusting a vertical component of a position of a club head of center of gravity may have particular benefit in a club head that also includes a mechanism for adjusting or configuring another physical parameter such as a loft angle.
Adjustable or configurable golf clubs are discussed further in U.S. Pat. No. 8,262,507; U.S. Pat. No. 7,771,291; U.S. Pat. No. 7,147,573; U.S. Pat. No. 6,015,354; U.S. Pat. No. 5,947,840; U.S. Pat. No. 4,052,075; U.S. Pub. 2011/0151990; U.S. Pub. 2010/0331102; and U.S. Pub. 2010/0075773, the contents of which are hereby incorporated by reference for all purposes.
A golf club head that includes a mechanism for adjusting a position of a club head center of gravity in a direction that includes a component that is substantially vertical when the club head is at address may be characterized by one or a combination of categories of features. Categories include: reversible member; separable cartridge member; repositionable/interchangeable weights; openable hatch; non-uniformly weighted member; track for weight travel; others; and combinations thereof. Embodiments that employ a reversible member are depicted, for example, in
References and citations to other documents, such as patents and patent publications, are hereby incorporated herein by reference in their entirety for all purposes.
EQUIVALENTSVarious modifications of the invention and many further embodiments thereof, in addition to those shown and described herein, will become apparent to those skilled in the art from the full contents of this document, including references to the scientific and patent literature cited herein. The subject matter herein contains important information, exemplification and guidance that can be adapted to the practice of this invention in its various embodiments and equivalents thereof.
Claims
1. A golf club head comprising:
- a face, a hosel, an aft body, and a mechanism operable to change a position of a center of gravity of the club head in a direction that has a substantial component that is vertical when the club head is at address.
2. The golf club of claim 1, wherein the mechanism comprises an openable cap.
3. The golf club head of claim 1, wherein the mechanism comprises a reversible member.
4. The golf club head of claim 1, wherein the mechanism comprises a separable cartridge member.
5. The golf club head of claim 1, wherein the mechanism comprises repositionable weights.
6. The golf club head of claim 1, wherein the mechanism comprises a non-uniformly weighted member.
7. The golf club head of claim 1, wherein the mechanism comprises a track for weight travel.
8. The golf club head of claim 1, wherein the mechanism comprises weights accessible at an exterior surface of a club head.
9. The golf club head of claim 1, wherein the mechanism is substantially concealed within the club head.
10. The golf club head of claim 1, wherein the mechanism is both accessible at an exterior surface and substantially contained within the club head.
11. A golf club head comprising:
- a mechanism for adjusting a center of gravity in a vertical direction without substantially changing the center of a gravity in a direction orthogonal to the vertical direction.
12. The club head of claim 11, wherein the mechanism comprises a separable member that can be attached to the club head in at least two different orientations.
13. The club head of claim 11, wherein the mechanism comprises a separable bent strap that can be attached to the club head in a corresponding recess in an aft portion of the club head.
14. The club head of claim 11, wherein the mechanism comprises an elevator member that includes a threaded shaft, rotation of which changes a height of the center of gravity substantially only in the vertical direction.
15. The club head of claim 11, wherein the mechanism comprises a plurality of ports, each configured to receive and retain a weight.
16. The club head of claim 15, wherein the plurality of ports are accessible by opening a single hatch on the club head.
17. The club head of claim 11, wherein the mechanism comprises a hole in a surface of the club head, the hole being configured to receive a weight pylon that attaches to the surface and positions a weight member within the club head spaced away from the surface.
18. The club head of claim 11, wherein the mechanism comprises an aft portion of the club head that is moveable relative to the rest of the club head.
19. A method for changing a vertical center of gravity of a golf club head, the method comprising:
- adjusting a center of gravity in a golf club head in a vertical direction without substantially changing the center of gravity in a direction orthogonal to the vertical direction.
20. The method of claim 19, further comprising repositioning a separable member, wherein the separable member is one selected from the list consisting of:
- a separable member that can be attached to the club head in at least two different orientations,
- a separable member with a non-uniform mass distribution,
- a separable member that can be attached to the club head in a corresponding recess in an aft portion of the club head,
- a separable member with a tab on one end dimensioned to be received by a slot on the club head,
- a separable member that can be attached to the club head in two orientations related by a 180° rotation of the separable member, and
- a threaded member.
Type: Application
Filed: Jun 3, 2013
Publication Date: Dec 5, 2013
Inventors: Karl A. Clausen (Carlsbad, CA), Peter L. Soracco (Carlsbad, CA), Richard Romo Sanchez (Temecula, CA), Joshua G. Breier (Vista, CA), Ryan L. Roach (Carlsbad, CA), Tim A. Beno (San Diego, CA), Andrew Curtis (Solana Beach, CA), Bret A. Newmiller (Oceanside, CA), David Morelock (San Clemente, CA)
Application Number: 13/908,269
International Classification: A63B 53/06 (20060101); A63B 59/00 (20060101); A63B 53/04 (20060101);