Improved putter grip to aid golf club alignment

Abstract

To obtain a system for taking aim by appropriately fitting a putter.SOLUTION: A grip 2506 includes: a butt end 25061 that is adjacent to an end edge part of a shaft when it is attached to a shaft; a distal end 25071 on the opposite side of the butt end; and a front surface part 25081 which is turned in a direction separated from a user in a normal address position. A front part includes a left edge 25087 extending for a length of the grip 2506 and a right edge 25089. The left edge and the right edge are symmetrical along a central line 25009 of the front part. The left edge and the right edge are tapered to be away from the central line of the front part in a direction from the butt end of the grip to the distal end, and then, become thicker toward the central line of the front part. The left edge and the right edge of the front part are useful to improve feeling of the user gripping the grip and positioning.SELECTED DRAWING: Figure 26

Description

[Technical field]

[0001] This invention relates to golf club fitting, and more particularly to an apparatus for properly fitting a putter. [Background technology]

[0002] The point of golf is to put the ball in the hole in the fewest strokes possible. Whether that stroke is a 300-yard drive or a one-foot putt, every stroke counts the same on the scorecard. Not everyone can hit the ball 300 yards, but not everyone can make a one-foot putt. So one of the best ways to improve your golf score is to improve your putting.

[0003] Although practicing is one way to improve your putting, it's not the only way. You can also improve your putting by making sure your putter is properly fitted and properly aligned.

[0004] Even if the putting stroke is technically perfect, if the putter is not fitted properly or does not aim at the intended target, a golfer will struggle to putt towards the hole. There are many ways to adjust a putter to fit a golfer.

[0005] The components of a conventional putter are shown in Figure 1. As shown in Figure 1, the putter 100 includes a striking face 101, a sole 102, and a hosel or neck 103 for connecting a putter head 104 to a shaft 105.

[0006] 1 illustrates several different ways a putter can be oriented at address. Note that like reference numbers have been omitted. The putter 100 is shown leaned forward or delofted (A), in a neutral address position (B), and also leaned back (C).

[0007] Loft is the angle between the striking face and a vertical plane perpendicular to the ground plane G when the putter is held in a normal address position. Effective loft is the angle between the striking face and a vertical plane perpendicular to the ground plane G at the actual address position. Thus, while the loft of the putter 100 is static based on the shape of the putter, the effective loft can change depending on how the putter 100 is tilted when addressing the ball.

[0008] Putters are typically angled about 4° to most effectively roll the golf ball. Noi The putter 100 shown in (A), (B), and (C) each has a loft of about 4 degrees. However, each of the putters 100 shown in (A), (B), and (C) has a different effective loft. The putter 100 shown in (B) is in a normal address position, so the effective loft αB is equal to the putter loft of 4°.

[0009] If the effective loft of a putter is too low, the putted ball will be driven into the ground, as shown by (A) in Figure 1. The putter 100 shown in (A) has an effective loft αA of about -1°. This causes the putted ball to bounce and then roll, making it difficult to hit the ball consistently in terms of distance and direction.

[0010] If the effective loft of the putter is too high, the putted ball will likely be launched into the air with backspin, as shown in (C) of Figure 1. The putter 100 shown in (C) has an effective loft αC of about 9°. These conditions also make it difficult to hit the ball consistently in terms of distance and / or direction.

[0011] Using a putter with the proper loft is important because slight differences in the loft angle can dramatically affect how the putt rolls, but without specialized equipment it can be difficult to correctly identify the proper loft for a putter.

[0012] Figure 2 shows the other side of the conventional putter. Features As shown in Figure 2, the putter 100 also includes a heel 106, a toe 107, and a lie angle.

[0013] The lie angle is the angle between the center of the shaft 105 and the ground plane G when the putter 100 is soled in its normal address position. The effective lie angle is the angle between the center of the shaft and the ground plane G when the putter is held in the actual address position. The Rules of Golf require that a putter's lie angle be less than 80 degrees. Like loft, it is important that a golfer use a putter with a proper lie angle.

[0014] Figure 2 illustrates the effect of lie angle and effective lie angle on a putted golf ball by showing several different ways a putter can be oriented at address. As shown in Figure 2, the putter 100 is shown in a neutral address position (B) with the toe 107 higher than the heel 106 (A) and with the heel 106 higher than the toe 107 (C).

[0015] When putting a ball using a putter 100 with a lie angle that is too upright (A), the putter 100 is oriented with the toe 107 higher than the heel at impact as shown in (A). The putter 100 shown in (A) has an effective lie angle βA of about 65°, which is about 5° less than the actual lie angle of the putter 100. In this position, the loft of the putter 100 will cause the ball to miss to the left of where the putter is aiming. As shown in FIG. 2, the line of sight is shown as a solid black line, and the arrow indicates where the ball will actually be hit.

[0016] When putting a ball using a putter with a correct lie angle (B), the lie angle and the effective lie angle are equal. The putter 100 shown in (B) has an effective lie angle βB of about 70°, which is equal to the lie angle. The putter 100 shown in (B) is oriented substantially parallel to the ground plane G at impact, and the ball rolls in the direction that the putter is aiming.

[0017] When a ball is putted using a putter with a lie angle that is too flat (C), the putter is oriented so that the toe 107 is lower than the heel 106 at impact. The putter 100 shown in (C) has an effective lie angle β of about 75°, which is about 5° greater than the actual lie angle of the putter 100. In this position, the loft of the putter will cause the ball to the right of where the putter is aiming.

[0018] Therefore, it is important to use a putter with the proper lie angle, as even slight differences in lie angle can dramatically affect how the putt rolls, but without special equipment, it can be difficult to correctly identify the proper lie angle.

[0019] FIG. 3 shows the ideal path that the putter head should follow during a putter stroke. It is important to swing the putter properly. Since all putters are required by the rules to have a lie angle, the ideal putting stroke is not a pendulum stroke, but one in which the putter head 104 follows an arcuate path 310 that is influenced by the lie angle of the putter. This deviates from the target line 311. FIG. 3 shows the "toe flow" 312 of the putter, and how the putter head 104 does not remain scare to the target line 311 during the stroke, but rather opens and closes like a gate by remaining scare to the arcuate path 310. The arcuate path 310 can also be facilitated by having a line of sight 313 inside the target line 311. The line of sight 313 corresponds to a vertical plane that extends downward from the eyes to the ground plane G. Swinging the putter without the proper arcuate path requires corrections and adjustments to the putting stroke that make it difficult to accurately hit the putt.

[0020] Properly aiming the putter is also very important when hitting a putt. Even if the putter has the perfect loft and lie angle and is swung along a perfect arcing path, it will still be difficult to putt if the putter is not properly oriented. It is not uncommon for golfers to aim the putter multiple degrees to the right or left of the intended target. The longer the putt, the more such aiming errors will affect the outcome of the putt. For example, aiming just one degree to the right or left of the target from 10 feet away is equivalent to missing the target by 2.1 inches. Since a standard golf cup is only 4.25 inches wide, this one degree error is enough to be the difference between a putt for par or a missed putt that results in a bogey.

[0021] Therefore, there is a need for a system for properly fitting and aiming a putter. The present invention provides such a system and fitting method. [Prior art documents] [Patent documents]

[0022] [Patent Document 1] US Patent Application Publication No. 2021 / 0154552 Summary of the Invention

[0023] The systems, methods, and devices described herein have several innovative aspects, no one of which is, alone, essential to or solely responsible for their desirable attributes. Without limiting the scope of the claims, some advantageous features will now be summarized.

[0024] The present technology relates generally to club fitting devices and methods for fitting golf clubs, and more particularly to devices and methods relating to putter-type golf clubs. More specifically, the present invention relates to systems and methods that allow a player to adjust the putter or putter orientation to achieve an optimal set-up position. By improving the set-up position, a player essentially improves their putting efficiency.

[0025] One aspect of the invention relates to a fitting device for golf clubs, the fitting device may include a first device body having a first opening formed therein for receiving a shaft of a golf club, a first angle indicator coupled to the first device body and exposed on an upper surface of the first device body, a second angle indicator coupled to the first device body and exposed on the upper surface of the first device body, and a stroke plane indicator coupled to the first device body and exposed through a lower surface of the first device body.

[0026] According to an embodiment, a first opening may be formed in a first device body at a first predetermined angle relative to a normal to a lower surface of the device.

[0027] The first predetermined angle may be between about 0° and about 30° relative to a normal to the lower surface of the first device body.

[0028] The first predetermined angle may preferably be between about 15° and about 25° relative to a normal to the lower surface of the first device body.

[0029] The first predetermined angle is most preferably approximately 20 degrees relative to a normal to the lower surface of the first device body and corresponds to the lie angle of a golf club.

[0030] The first angle indicator may be configured to measure a change corresponding to an effective lie angle of the golf club, where the effective lie angle of the golf club is the angle between the shaft of the golf club and the ground when the club is held in an address position.

[0031] The second angle indicator can be configured to measure a change corresponding to the effective loft angle of the golf club, which is the angle between the striking face of the golf club and a normal to the ground when the club is held in an address position.

[0032] The fitting device may further include a second opening formed in the first device body at the first predetermined angle, the second opening configured to receive the stroke plane indicator therein.

[0033] The stroke surface indicator may include a collimated light source, which when received within the second opening may emit collimated light.

[0034] The fitting device may include a fastener securable through a side of the first device body adjacent the first opening.

[0035] The fastener may be securable through a side of the first device body at a complement of the first predetermined angle.

[0036] Another aspect of the invention is directed to a system for fitting a putter, the system including a putter having a body, a striking face, a back surface opposite the striking face, a heel, a toe opposite the heel, a sole, an upper surface opposite the sole, and a shaft coupled to the golf club head, the system may further include a fitting device including a first device body, a first opening formed in the first device body for receiving the shaft of the putter, the first opening being formed at a first predetermined angle, a fastener configured to apply a force to the shaft in the first opening, the fastener being attachable through an exterior surface of the first device body adjacent the first opening, and a first angle indicator coupled to the first device body and exposed on an upper surface of the first device body, the first angle indicator configured to adjust the angle of the putter when the putter is held in an address position. a first angle indicator coupled to the first device body and exposed on the upper surface of the first device body, the second angle indicator configured to measure the difference between the effective loft angle of the putter and the prescribed loft angle of the putter when the putter is held in the address position, a first groove formed in the lower surface of the first device body, the first groove configured to receive the collimated light source, and a reflective member removably attached to the striking face. In a first configuration, the fitting device is coupled to the shaft of the putter such that the collimated light source projects a light beam toward the ground in a direction parallel to the shaft, and in a second configuration, the collimated light source projects a light beam in a direction parallel to a target line toward the reflective member.

[0037] The first predetermined angle may be between about 0° and about 30° relative to the vertical direction of the lower surface of the first device body.

[0038] The first predetermined angle may be between about 15° and about 25° with respect to the vertical direction of the lower surface of the first device body.

[0039] A first predetermined angle may be approximately 20° from the vertical of the lower surface of the first device body and may correspond to a lie angle of the golf club.

[0040] A fastener may be attachable through the exterior surface of the first device body at a complement to the first predetermined angle.

[0041] According to another aspect of the invention, a method of fitting a putter using a fitting device may include the steps of attaching the fitting device to a shaft of the putter; measuring at least one of an effective lie angle, an effective loft angle, and a stroke plane of the putter with the fitting device while the putter is held in an address position; and modifying the putter and at least one of the address position to modify at least one of the effective lie angle, the effective loft angle, and the stroke plane.

[0042] The effective loft angle may be measured using a first angle indicator exposed through an upper surface of the fitting device, the effective lie angle is measured using a second angle indicator exposed through an upper surface of the fitting device, and the stroke plane is measured using a collimated light source exposed through a lower surface of the fitting device to project a beam of collimated light in a direction parallel to the shaft.

[0043] The method of fitting a putter using a fitting device further includes the steps of removing the fitting device from the shaft, positioning the fitting device on a ground plane, mounting the collimated light source on the fitting device so as to project a beam of collimated light in a direction substantially parallel to the ground plane, orienting the putter toward the collimated light source so that the beam of collimated light projected parallel to an upper ground plane contacts a reflective surface disposed on a striking face of the putter, measuring a position of the reflected beam from the reflective surface, and adjusting at least one of the putter and the address position to adjust the position of the collimated beam reflected from the reflective surface.

[0044] According to another aspect of the invention, a fitting device for a golf club including a shaft defining a shaft axis, a golf club head coupled to a first end of the shaft, and a golf club grip coupled to a second end of the shaft opposite the first end, the fitting device having a first device body having a lower surface, an upper surface opposite the lower surface, and an outer surface connecting the lower surface and the upper surface, and an angle indicator coupled to the first device body and exposed at the upper surface of the first device body, the first device body being coupled to the grip such that the lower surface of the first device body contacts a tip of the grip, and the first device body being positioned at a predetermined angle with respect to a plane extending perpendicular to the shaft axis such that the angle indicator is in a neutral position when the golf club is in a normal address position.

[0045] According to another aspect of the invention, a method of adjusting a putter using a fitting device includes attaching the fitting device to a grip of the putter, measuring with the fitting device an effective lie angle and an effective loft angle of the putter when the putter is held in an address position, and modifying at least one of the putter and the address position to adjust at least one of the effective lie angle and the effective loft angle.

[0046] According to another aspect of the invention, there is provided a grip for a golf club including a shaft defining a shaft axis and a golf club head connected to a first end of the shaft, the grip coupled to a second end of the shaft opposite the first end, the grip having a butt end furthest from the golf club head and a distal end opposite the butt end, the butt end and / or the distal end of the grip being angled with respect to a plane perpendicular to the shaft axis such that a top surface of the butt end and / or a bottom surface of the distal end are substantially parallel to the ground when the golf club is in a normal address position.

[0047] According to another aspect of the invention, a grip having a butt end and / or a distal end angled relative to the plane perpendicular to the shaft axis can be combined with a device body, the device body being combined with the grip such that a lower surface of the device body contacts the butt end of the grip and an upper surface of the device body is substantially parallel to the upper surface of the butt end of the grip such that an angle indicator positioned on the grip is in a neutral position when the golf club is in a normal address position.

[0048] According to another aspect of the invention, a grip for a golf club including a shaft defining a shaft axis and a golf club head connected to a first end of the shaft, the grip connected to a second end of the shaft opposite the first end, the grip including a butt end furthest from the golf club head, a distal end opposite the butt end, a front portion, a rear portion, a left portion, and a right portion, the front portion, the rear portion, the left portion, and the right portion extending along a length of the grip from the butt end to the distal end, the front portion including left and right edges extending along the length of the grip, the left and right edges being symmetrical to one another along a center line of the front portion, the left and right edges gradually moving away from the center line of the front portion and then gradually approaching the center line of the front portion near the distal end of the grip, and a plane including the right and left edges may be formed parallel to a target line in a normal address position. [Brief description of the drawings]

[0049] The foregoing and other features and advantages of the present invention will become apparent from the following description of the invention as illustrated in the accompanying drawings, which are incorporated herein and form a part of the specification, and further serve to explain the principles of the invention and enable one skilled in the relevant art to make and use the invention.

[0050] [Figure 1] A putter is shown with varying shaft tilt angles which alter its effective loft. [Diagram 2] A putter is shown with varying shaft lean angles that change its effective lie angle. [Diagram 3] Shows an arcuate putting stroke. [Figure 4] 1 shows an exploded perspective view of a golf club fitting device according to an exemplary embodiment of the present invention. [Diagram 5] 1 shows a perspective view of a golf club fitting device according to an exemplary embodiment of the present invention. [Figure 6] 1 shows an overhead view of a golf club fitting device according to an exemplary embodiment of the present invention. [Figure 7] 1 illustrates a side view of a golf club fitting device attached to a shaft according to an exemplary embodiment of the present invention. [Figure 8] 1 illustrates an overhead view of a golf club fitting device attached to a right-handed golf club according to an exemplary embodiment of the present invention. [Figure 9] 1 illustrates an overhead view of a golf club fitting device attached to a left-handed golf club according to an exemplary embodiment of the present invention. [Figure 10] 1 illustrates a side view of a golf club fitting device attached to a golf club according to an exemplary embodiment of the present invention. [Figure 11] 1 illustrates a front view of a golf club fitting device attached to a golf club according to an exemplary embodiment of the present invention. [Figure 12] 1 illustrates an exploded perspective view of a bottom portion of a golf club fitting device according to an exemplary embodiment of the present invention. [Figure 13] 1 shows a side view of a golf club fitting device according to an exemplary embodiment of the present invention. [Figure 14] 1 shows a side view of a putter with a reflective member attached for use in conjunction with a golf club fitting device according to one embodiment of the present invention. [Figure 15] 2 illustrates a flow chart of a method for fitting a putter with a golf club fitting device according to an exemplary embodiment of the present invention. [Figure 16] 1 illustrates a side view of a golf club fitting device attached to a golf club in accordance with an exemplary embodiment of the present invention. [Figure 17] 1 shows a side view of a golf club fitting device attached to a grip according to an exemplary embodiment of the present invention. [Figure 18] 1 shows a perspective view of a golf club fitting device according to an exemplary embodiment of the present invention. [Figure 19] 2 illustrates a flow chart of a method for fitting a putter with a golf club fitting device according to an exemplary embodiment of the present invention. [Figure 20] FIG. 20 shows a side view of a grip attached to a golf club in accordance with an exemplary embodiment of the present invention. [Figure 21] FIG. 21 illustrates a side view of a grip according to an exemplary embodiment of the present invention. [Figure 22] FIG. 22 illustrates a side view of a golf club fitting device attached to a golf club in accordance with an exemplary embodiment of the present invention. [Figure 23] FIG. 23 shows a side view of a golf club fitting device attached to a grip in accordance with an exemplary embodiment of the present invention. [Figure 24] FIG. 24 shows a perspective view of a golf club fitting device according to one embodiment of the present invention. [Diagram 25] FIG. 25 illustrates a perspective view of a grip according to an exemplary embodiment of the present invention. [Figure 26] FIG. 26 illustrates a front view of a grip in accordance with an exemplary embodiment of the present invention. [Figure 27] FIG. 27 illustrates a top view of a grip according to an exemplary embodiment of the present invention. [Figure 28] FIG. 28 illustrates a top view of a grip according to an exemplary embodiment of the present invention. [Figure 29] FIG. 29 illustrates a top view of a grip according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0051] In the following detailed description, reference is made to the accompanying drawings, which form a part of this disclosure. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are expressly contemplated and form a part of the disclosure. For example, a system or device may be implemented, or a method may be practiced, using any number of the aspects described herein. Furthermore, such a system or device may be implemented, or such a method may be practiced, using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects described herein. Alterations and further modifications of the features of the invention as set forth herein, and additional applications of the principles of the invention as set forth in this disclosure, may be effected by one skilled in the relevant art and in possession of this disclosure, and should be considered within the scope of the invention.

[0052] Other than in the working examples, or unless otherwise stated, all numerical ranges, amounts, values, and percentages, such as amounts of materials, moments of inertia, center of gravity locations, loft and bounce angles, power spectrum, frequency, etc., may be read as if preceded by the word "about," even if the term "about" is not explicitly stated in the value, amount, or range. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the 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 be construed at least in light of the number of reported significant digits and by applying ordinary rounding techniques.

[0053] 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. However, numerical values ​​inherently contain certain errors resulting from the standard deviation found in their respective testing measurements. Moreover, when numerical ranges of various scopes are set forth herein, it is noted that any combination of these values ​​inclusive of the recited values ​​may be used.

[0054] In describing the present technology, the following terms may be used: The singular forms (corresponding to the original terms "a", "an", and "the") include plural referents unless the context clearly dictates otherwise. Thus, for example, a reference to an item includes a reference to one or more items. The term "plurality" refers to two or more items. The term "substantially" means that the described characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including, for example, tolerances, measurement errors, limitations of measurement accuracy, and other factors known to those skilled in the art, may occur in amounts that do not preclude the effect that the characteristic is intended to provide. For convenience, multiple items may be presented in a common list. However, these lists should be construed as if each member of the list were individually identified as a separate and unique member. Thus, individual members of such lists should not be construed as being effectively equivalent to other members of the same list solely based on presentation in a common group, without indication to the contrary. Furthermore, when the terms "and" and "or" are used in conjunction with a list of items, they should be construed broadly, such that any one or more of the listed items may be used alone or in combination with the other listed items. The term "alternatively" refers to the selection of one of two or more options and is not intended to limit the selection of only listed options at a time or to only one of the listed options, unless the context clearly indicates otherwise.

[0055] Features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. After considering this discussion, and particularly after reading the section entitled "Detailed Description," one will appreciate how the illustrated features serve to explain certain principles of the present disclosure.

[0056] 4-7, an embodiment of a golf club fitting device 400 is disclosed in accordance with the present invention. Fig. 4 is an exploded view of the golf club fitting device 400. Fig. 5 is a perspective view of the golf club fitting device 400. Fig. 6 is an overhead view of the golf club fitting device, and Fig. 7 is a side view of the golf club fitting device 400.

[0057] As shown in FIGS. 4 and 5 , the golf club fitting device 400 can include a first device body 401, a first opening 402, a first angle indicator 403, a second angle indicator 404, one or more second openings 405, one or more third openings 406, a stroke plane indicator 407, a fastener 408, and a first groove 410.

[0058] As shown in FIG. 5, the first opening 402 is formed through the upper surface 412 and the lower surface 413 of the golf club fitting device 400 and includes a slot portion 402a formed through a side 414 of the golf club fitting device 400, and an arcuate portion 402b connected to an end of the slot portion 402a.

[0059] 6, an upper surface of the golf club fitting device 400 is shown to better illustrate the relative dimensions. According to one embodiment of the present invention, the golf club fitting device 400 may have a width W of between about 2.0 inches and 5.0 inches. Preferably, the width W of the golf club fitting device 400 is between about 2.5 inches and about 3.5 inches. The golf club fitting device 400 may have a length L of between about 1.5 inches and about 4.0 inches. Preferably, the length L of the golf club fitting device 400 is between about 2.0 inches and about 3.0 inches.

[0060] The slot portion 402a of the first opening 402 can have a width W1 that is between about 0.5 inches and about 1.0 inches to accommodate insertion of a shaft. Preferably, the slot portion 402a has a width W1 that is between about 0.5 inches and about 0.75 inches.

[0061] The arcuate portion 402b may have a width greater than the width of the slot portion 402a to facilitate proper alignment of the golf club fitting device 400 onto the shaft. According to one embodiment of the present invention, the arcuate portion 402b of the first opening 402 may have a width W2 that is between about 0.75 inches and 1.5 inches. Preferably, the arcuate portion 402b has a width W2 that is between about 0.75 inches and 1.0 inch.

[0062] The second opening 405 can have a diameter D between about 0.1 inches and about 1.0 inches. Preferably, the diameter D of the second opening 405 is between 0.25 inches and about 0.75 inches.

[0063] According to an embodiment of the present invention as shown in FIG. 7, the golf club fitting device 400 may have a height H of between about 0.1 inches and about 1.5 inches. Preferably, the height H of the golf club fitting device 400 is between about 0.25 inches and about 1.0 inches. Most preferably, the height H of the golf club fitting device is about 0.5 inches.

[0064] The first device body 401 of the golf club fitting device 400 may be formed of any suitable material. Preferably, the first device body 401 of the golf club fitting device 400 is formed of a lightweight material so as not to unduly affect the balance of the golf club when installed. The first device body 401 of the golf club fitting device 400 may be formed of metal, wood, plastic, or a composite material. According to an illustrative example, the first device body 401 of the golf club fitting device 400 may be formed of anodized 6061 aluminum.

[0065] Referring to FIG. 7, the golf club fitting device 400 is shown from the side to clearly show the unique aspects of the first opening 402. As shown in FIG. 7, both the slot portion 402a and the arcuate portion 402b of the first opening 402 may be formed at a first angle θ with respect to a normal to a lower surface 413 of the golf club fitting device 400. The first angle θ ensures that the golf club fitting device 400 is substantially parallel to the ground plane G when the golf club fitting device 400 is attached to the shaft 105 of a putter held in a normal address position. The first angle θ may range from about 0° to about 30° with respect to a normal to the lower surface 413 of the golf club fitting device 400. Preferably, the first angle θ may range from about 15° to about 25° with respect to a normal to the lower surface 413 of the golf club fitting device 400. Most preferably, the first angle θ may be approximately 20° relative to a normal to the lower surface 413 of the golf club fitting device 400, which is the lie angle α of the putter.

[0066] 5 and 7, the fastener 408 is configured to protrude into the first opening 402 and apply a force to secure the shaft 105 within the arcuate portion 402b of the first opening 402. According to an embodiment of the invention, the fastener 408 may be a threaded fastener that mates with corresponding threads on the golf club fitting device 400. Alternatively, the fastener 408 may be a friction fit into a corresponding opening formed in the golf club fitting device 400.

[0067] According to one embodiment, as shown in FIG. 7, the fastener 408 may pass through the side 414 of the golf club fitting device 400 at an angle that is complementary to the first angle θ. That is, the central axis of the fastener 408 may extend in a direction that is substantially perpendicular to the inclined surface of the first opening 402. Alternatively, the fastener 408 may pass through the side 414 of the golf club fitting device 400 at an angle that is not complementary to the first angle θ. For example, as shown in FIG. 5, the fastener 408 may pass through the side 414 of the golf club fitting device 400 at an angle that is substantially perpendicular to the side 414 of the golf club fitting device 400.

[0068] 7, when the shaft is secured within the golf club fitting device 400, the fastener 408 applies a force to the shaft 105 such that the shaft 105 contacts the angled surface of the arcuate portion 402b opposite the fastener 408. The first angle θ of the surface of the arcuate portion 402b ensures that the golf club fitting device 400 is substantially parallel to the ground plane G when secured to the shaft 105.

[0069] 4 and 5, the second opening 405 is formed through the upper surface 412 and the lower surface 413 of the golf club fitting device 400. The stroke plane indicator 407 may be secured within the second opening 405 and exposed through the lower surface 413 of the golf club fitting device 400 by any number of known fastening methods. For example, the stroke plane indicator 407 may include an increased diameter portion that is greater than the diameter of the second opening 405 such that the stroke plane indicator 407 cannot pass completely through the second opening 405. Alternatively, the stroke plane indicator 407 may have a tapered diameter and the second opening 405 may have either a uniform diameter or a corresponding tapered diameter to prevent the stroke plane indicator 407 from passing completely therethrough.

[0070] The second opening 405 may be formed at a first angle θ and positioned such that an axis passing through the center of the stroke plane indicator 407 is substantially parallel to the shaft angle of the putter secured within the first opening 402 and intersects the ground plane G in front of the striking face. According to one embodiment, the stroke plane indicator 407 may be a collimated light source such as that emitted by a laser (i.e., solid state laser, laser pointer) with minimal power, typically less than about 3 mW. The axis passing through the center of the stroke plane indicator 407 may be a beam of the laser.

[0071] According to one embodiment of the present invention, the golf club fitting device 400 may include two second openings 405 to accommodate both right-handed and left-handed putters. As shown in Figures 8 and 9, one of the second openings 405 is located to the left of where the shaft contacts the arcuate portion 402b of the first opening 402, and the other of the second openings is located to the right of where the shaft contacts the arcuate portion 402b of the first opening 402.

[0072] As shown in FIG. 8, when the golf club fitting device 400 is attached to a right-handed putter, the shaft 105 of the right-handed putter is secured within the first opening 402 and the stroke plane indicator 407 is secured within the second opening 405 located to the left of where the shaft 105 contacts the arcuate portion 402b of the first opening 402.

[0073] As shown in FIG. 9, when the golf club fitting device 400 is attached to a left-handed putter, the shaft 105 of the left-handed putter is secured within the first opening 402 and the stroke plane indicator 407 is secured within the second opening 405 located to the right of where the shaft 105 contacts the arcuate portion 402b of the first opening 402.

[0074] 8-11, whether the golf club fitting device 400 is attached to a right-handed or left-handed golf club, an axis passing through the center of the stroke plane indicator 407 is substantially parallel to the shaft 105 secured within the first opening 402 and intersects the ground plane G in front of the striking face at or near the center of the striking face. This relationship is independent of the height at which the golf club fitting device 400 is attached to the shaft. Although various shapes of putter shafts and putter necks / hoses may result in the axis passing through the center of the stroke plane indicator 407 and intersecting the ground plane G at slightly different locations, the advantages of the invention remain, as will be explained below.

[0075] 4-6, the golf club fitting device 400 may include one or more angle indicators. According to one embodiment, the golf club fitting device 400 includes a first angle indicator 403 and a second angle indicator 404. As shown in FIG. 6, the first angle indicator 403 and the second angle indicator 404 may be positioned substantially perpendicular to one another. The first angle indicator 403 may be positioned to be parallel to a leading edge of a striking face of the putter when the putter shaft is secured within the first opening 402. The second angle indicator 404 may be positioned to be parallel to a line of sight when the putter shaft is secured within the first opening 402.

[0076] According to one embodiment, the first angle indicator 403 and the second angle indicator 404 may be secured within the third opening 406 such that they are exposed through an upper surface 412 of the golf club fitting device 400. The third opening 406 may be formed partially or completely through the first device body 401 of the golf club fitting device 400. Preferably, the third opening 406 is formed completely through the first device body 401 of the golf club fitting device 400. The first angle indicator 403 and the second angle indicator 404 may be secured within the third opening 406 either from above through the upper surface 412 of the golf club fitting device 400 or from below through the lower surface 413 of the putter fitting device 400. Preferably, the first angle indicator 403 and the second angle indicator 404 are secured within the third opening 406 through the lower surface 413 of the golf club fitting device 400 by press-fitting or snap-fitting.

[0077] As shown in Figures 8 and 9, when the golf club fitting device 400 is attached to a right-handed or left-handed putter, the first angle indicator 403 can indicate the effective lie angle of the putter, and the second angle indicator 404 can indicate the effective loft angle of the putter.

[0078] 6, the markings 409 may be formed on the first device body 401 of the golf club fitting device 400 proximate the first angle indicator 403 and the second angle indicator 404. The markings 409 may be formed on the first device body 401 in any suitable manner, including but not limited to, etched, embossed, or engraved on the first device body 401 of the golf club fitting device 400. The markings 409 preferably indicate the effective lie and loft angles in fractions of a degree over a range of greater than 10 degrees. Alternatively, the markings 409 may be formed directly on the first angle indicator 403 and the second angle indicator 404.

[0079] Additionally, the first angle indicator 403 and the second angle indicator 404 may be provided in a number of different configurations such that the scale and range of the markings 409 may vary depending on the precision required for a particular fitting. For example, as a golfer's skill level changes, different first angle indicators 403 and / or second angle indicators 404 measuring a smaller or larger overall range of angles may be utilized and thus the markings 409 may represent larger or smaller increments, respectively.

[0080] As an example, if the putter shaft 105 is secured within the first opening 402, when the putter shown in Figure 8 is tilted more vertically, or "more upright," the first angle indicator 403 will indicate this change in angle. Similarly, when the putter shown in Figure 7 is tilted downward, or "flatter," the first angle indicator 403 will indicate this change in angle.

[0081] Similarly, if the putter shaft is secured within the first opening 402, and the putter shown in Figure 7 is tilted to the left or "pushed forward," the second angle indicator 404 will indicate this change in angle. Similarly, if the putter shown in Figure 8 is tilted to the right or "reverse tilt," the second angle indicator 404 will indicate this change in angle.

[0082] 9, the golf club fitting device 400 is shown when attached to a left-handed putter. The shaft of the left-handed putter is secured within the first opening 402, and the first angle indicator 403 and the second angle indicator 404 are used to indicate the effective lie angle and effective loft angle, respectively. In this configuration, the effective lie angle can be measured on the same scale as the right-handed configuration, but the effective loft angle is measured using a second set of markings due to the opposite loft angles for right-handed and left-handed clubs.

[0083] The first angle indicator 403 and the second angle indicator 404 may be any angle indicator, including, but not limited to, a spirit level, a tilt sensor, a tilt indicator, a tilt meter, a tilt gauge, a grade meter, a grade gauge, a level meter, a level gauge, a curved gas-filled inclinometer, and a curved fluid-filled inclinometer. Preferably, the first angle indicator 403 and the second angle indicator 404 are curved vial-type fluid-filled inclinometers having a radius of curvature and filled with a damping fluid to ensure a smooth response angle indication. The radius of curvature of the inclinometer affects the measurement range of the inclinometer. Thus, the curvature may be adjusted according to a desired range, for example, based on the player's skill.

[0084] If the inclinometer includes a bubble indicator, the ends of the first angle indicator 403 and the second angle indicator 404 are oriented lower than their central portions. Conversely, if the inclinometer includes a ball indicator, the ends of the first angle indicator 403 and the second angle indicator 404 are oriented higher than their central portions.

[0085] 10 and 11, a golf club fitting device 400 according to the present invention is shown attached to a golf club shaft 105. Figure 10 is a front view of golf club fitting device 400 implemented in accordance with an embodiment of the present invention, and Figure 11 is a side view of golf club fitting device 400.

[0086] As a result of the unique structure of the golf club fitting device 400, the golf club fitting device 400 can be installed on any straight portion of the shaft 105. As shown in FIGS. 9 and 10, the golf club fitting device is mounted progressively lower on each of the golf clubs (A), (B), and (C). However, despite the different configurations, the axis of the stroke path indicator 407 intersects the ground plane G at substantially the same location. It should be noted that putters may include different types of shafts with different bending profiles. However, regardless of the bending profile of the shaft, or the mounting location on the shaft, the axis of the stroke path indicator 407 intersects the ground plane G at substantially the same location for a given putter. If the putter is held to deviate from the proper address position, the intersection point will also move slightly, which provides an additional way for the golf club fitting device 400 to assist in ensuring that the putter is properly fitted.

[0087] 12 and 13, the golf club fitting device 400 is shown in a second configuration. In the second configuration, the golf club fitting device 400 is positioned on the ground and a collimated light source is attached to the golf club fitting device such that an axis passing through its center is emitted substantially parallel to the ground plane G. The collimated light source may be the stroke plane indicator 407 or may be a different collimated light source. Preferably, the collimated light source is the stroke plane indicator 407 and is positioned within a first groove 410 defined in a lower surface 413 of the golf club fitting device 400 when the golf club fitting device 400 is inverted as shown in FIGS. 12 and 13.

[0088] Referring to FIG. 14, the light emitted by the stroke plane indicator 407 can be directed toward the striking face of the putter to ensure proper alignment of the putter with respect to the putting line. The stroke plane indicator 407 is oriented perpendicular to the striking face of the putter head 104. The putter head 104 includes a reflective surface 1401 attached to the striking face 101. The incident beam 1301 emitted by the stroke plane indicator 407 strikes the reflective surface 1401 and returns as a reflected beam 1302 away from the reflective surface 1401 toward an indexed reference device such as an opaque surface, such as a ruler or paper, a grid, such as graph paper, or a photodetector, such as a charge-coupled device ("CCD"). The reflective surface 1401 can be any reflective surface, but is preferably a mirror or highly polished glass fused silica. Spacers or shims can be used to orient the reflective surface at the appropriate angle to return the collimated light source to the reference device.

[0089] When the golfer addresses the golf ball before making a putting stroke, the reflected beam 1302 is reflected back to the reference device. The location of the reflected beam 1302 on the reference device assists the golfer in determining the orientation of the putter face before making a putting stroke. For example, if the putter face of a right-handed putter is held in an "open" orientation, the laser beam spot is reflected to the right of center on the reference device. Conversely, if the putter face of a right-handed putter is held in a closed orientation, the laser beam spot is reflected to the left of center on the reference device. Of course, if the putter face is square, the laser beam spot is reflected directly to the center of the reference device.

[0090] The present invention also relates to a method of fitting and aligning a golf club, the method including providing a golf club having a head with a loft angle and a shaft extending from the head at a lie angle, attaching a golf club fitting device to the shaft of the golf club, measuring an effective loft, an effective lie angle, and adjusting the length and / or position of the golf club based on the effective lie angle and the effective loft. The method also includes swinging the club, measuring a swing plane of the golf club using the golf club fitting device, and adjusting the swing plane in response to the measured swing plane. The method also includes aiming the golf club at a target, measuring an actual aim point of the golf club, and adjusting the aim based on the measured aim point.

[0091] Referring to Figure 15, a flow chart diagram illustrates a preferred method of mounting and adjusting a club in accordance with the present invention. The approaches and techniques illustrated by the flow chart are sufficient to describe at least one implementation of the method. However, other implementations of the method may utilize approaches and techniques derived from those shown. It should be understood that the steps of the method outlined in the flow chart are not limited to the order described, rather, the steps may be performed in any order and still be within the scope of this disclosure.

[0092] First, at 1501, the club fitting device 400 is attached to the shaft 105 of a golf club, as shown in Figure 15. The club fitting device 400 may be secured to the shaft 105 with fasteners. The golf club fitting device 400 is positioned on the shaft 105 such that its leading edge (left edge in Figure 8, right edge in Figure 9) is substantially parallel to the leading edge of the striking face of the putter.

[0093] Next, at 1502, a stroke plane indicator 407 is secured to the golf club fitting device. The stroke plane indicator may be a collimated light source, such as a laser, that emits a collimated beam. The stroke plane indicator 407 may be mounted differently based on whether the putter is right-handed or left-handed.

[0094] Next, at 1503, the golf club is held in an address position and the first angle indicator 403 and the second angle indicator 404 are read to determine the effective lie angle and effective loft angle of the putter. In particular, the first angle indicator 403 and the second angle indicator 404 indicate the degree of deviation of the putter from the normal address position.

[0095] Next, at 1504, the position of the putter and / or the putter itself may be adjusted based on the readings of 1503. For example, if the readings of the first angle indicator 403 and the second angle indicator 404 indicate that at least either the effective lie angle and the effective loft angle are not at the prescribed levels, the putter may be repositioned so that the effective lie angle and the effective loft angle are at the prescribed levels. If the golfer is uncomfortable addressing the ball in a manner that ensures that the effective lie angle and the effective loft angle are at the prescribed levels, the actual putter may be adjusted or replaced. Adjusting or replacing the putter may include either changing the lie angle of the putter, changing the loft angle of the putter, or changing the length of the putter shaft so that the effective lie angle and the effective loft angle are at the prescribed levels.

[0096] Next, at 1505, the swing plane of the putter is evaluated. In particular, the stroke plane indicator 407 is turned on and the light emitted therefrom is focused on or near an area in front of the striking face of the putter. While the light is being emitted from the stroke plane indicator 407, the putter is swung as if in use. As the putter is swung, the light emitted from the stroke plane indicator 407 indicates the swing plane on the ground. If the putter is swung on a proper plane, the path that the stroke plane indicator 407 follows on the ground will be parallel to the intended target line. For example, as shown in FIG. 8, if the light emitted by the stroke plane indicator 407 is focused on the target line 311 at address, the stroke plane indicator 407 will trace the target line 311 during the backswing and follow-through with a proper arc-shaped path 310. It will be appreciated that depending on the type of shaft attached to the putter, the stroke plane indicator 407 may be focused on the target line, a heel direction of the target line, or a toe direction of the target line. Regardless of where the stroke plane indicator 407 is focused, the stroke plane indicator 407 will trace a substantially straight line that is substantially parallel to the target line 311 when the stroke lies on a plane and follows the appropriate arcuate path 310.

[0097] Next, at 1506, the stroke and / or putter may be adjusted based on the tracing of the stroke plane indicator 407 at 1505. Many different adjustments may be made based on the tracing, including the golfer's eye movement, body alignment, grip, weight distribution, the shape of the putter itself, etc.

[0098] The golf club fitting device 400 is then removed from the shaft and placed on the ground at 1507. A stroke plane indicator 407 is placed on the golf club fitting device 400.

[0099] Next, at 1508, the putter is placed in an address position such that the stroke plane indicator 407 illuminates toward the striking face 101 of the putter 100 while the stroke plane indicator 407 is illuminated. As the golfer addresses the golf ball before making a putting stroke, the beam emitted from the stroke plane indicator 407 is reflected back to the reference device. The position of the reflected beam on the reference device helps the golfer determine the orientation of the putter face before making a putting stroke. For example, if a right-handed putter face is held in an "open" orientation, the laser beam spot will be reflected to the right of center of the reference device. Conversely, if the putter face of a right-handed putter is held in a closed orientation, the laser beam spot will be reflected to the left of center of the reference device. Of course, if the putter face is square, the laser beam spot will be reflected directly to the center of the reference device.

[0100] Then, at 1509, the setup position and / or the putter can be adjusted based on how the laser beam spot is reflected. These adjustments can include the golfer's eye movement, body alignment, grip, weight distribution, and the shape of the putter itself.

[0101] A golf club fitting device according to one embodiment of the present invention is disclosed in Figures 16 to 18. Figure 16 is a side view of the golf club fitting device attached to the grip of a golf club. Figure 17 is a side view of the grip and the golf club fitting device. Figure 18 is a perspective view of the golf club fitting device attached to the grip of a golf club.

[0102] As shown in FIG. 16, the putter 160 includes a putter head 1604. A shaft 1605 is attached to the putter head 1604. A shaft axis 1609 extends from the putter head 1604 through the center of the shaft 1605. When the putter is held in a normal address position (e.g., held so that the prescribed loft and lie angles of the putter are equal to the effective loft and lie angles of the putter), the shaft axis 1609 is disposed at a lie angle β relative to the ground plane G. A grip 1606 is attached to the end of the shaft 1605 opposite the putter head 1604. A golf club fitting device 1600 is attached to the putter 160 at the butting end of the grip 1606.

[0103] 17, the grip 1606 and the golf club fitting device 1600 attached thereto are shown in greater detail to explain some of the unique features of the golf club fitting device 1600 in greater detail.

[0104] 17, the grip 1606 includes a head 16061 at its terminal end. The head 16061 of the grip 1606 may be formed at any angle relative to the shaft axis 1609, however, preferably, the head 16061 of the grip 1606 is formed substantially perpendicular to the shaft axis 1609. The golf club fitting device 1600 includes a second device body 1601. The second device body 1601 may be formed from metal, wood, plastic, or a composite material. According to an exemplary embodiment, the second device body 1601 of the golf club fitting device 1600 may be formed from anodized 6061 aluminum.

[0105] The second device body 1601 includes a lower surface 16013, an upper surface 16012 opposite the lower surface 16013, and a side 16014 connecting the lower surface 16013 and the upper surface 16012. The lower surface 16013 of the second device body 1601 is in contact with a headend 16061 of the grip 1606 when the golf club fitting device 1600 is attached thereto. According to one embodiment of the invention, the lower surface 16013 and the headend 16061 of the grip 1606 may be configured to substantially conform to one another such that the transition from the grip 1606 to the golf club fitting device 1600 is substantially seamless.

[0106] 17, the lower surface 16013 and the upper surface 16012 of the second device body 1601 may be configured to be angularly offset from one another, i.e., the lower surface 16013 of the second device body 1601 may be substantially parallel to the head 16061 of the grip 1606, and the upper surface 16012 of the second device body 1601 may be substantially parallel to the ground plane G when the putter 160 is held in a normal address position.

[0107] Although the lower surface 16013 and the upper surface 16012 of the second device body 1601 may be offset from one another, the critical dimension is actually the first angle θ between the upper surface 16012 of the second device body 1601 and a plane 1611 perpendicular to the shaft axis 1609. According to an embodiment of the present invention, the first angle θ may be between about 0° and about 30°, preferably, the first angle θ may be between about 15° and about 25°, and most preferably, the first angle θ may be about 20°, and may be a complement of the lie angle β.

[0108] When the first angle θ is in this range, the upper surface 16012 of the second device body 1601 is substantially parallel to the ground plane G when the putter 160 is held in a normal address position.

[0109] It should be noted here that the first angle θ is the same as the first angle θ described above with respect to Figure 7. The first angle θ, as shown in Figure 16, is measured relative to the shaft axis 1609 rather than the lower surface 413 of the golf club fitting device 400, and the first angle θ ultimately controls the orientation of the golf club fitting device 400 and the golf club fitting device 1600 relative to the ground G in a similar manner.

[0110] Note that the shaft axis 1609 may not pass exactly through the center of the grip 1606. In accordance with the Rules of Golf, a putter grip may be asymmetric. For example, as shown in FIG 17, the grip 1606 may be pistol shaped, where the circumference of the grip 1606 is greatest near the head 16061, where the majority of the grip 1606 is located below the grip 1606 from the golfer's perspective.

[0111] 18, a perspective view of the golf club fitting device 1600 allows some additional features to be more clearly shown. As shown in FIG 18, the angle indicator 1603 is coupled to the second device body 1601 and exposed on an upper surface 16012 of the second device body 1601. The angle indicator 1603 may be secured to the second device body 1601 by a press fit, a snap fit, adhesive, mechanical fastening, or the like.

[0112] The angle indicator 1603 may further include a level indicator 16034. The angle indicator 1603 may be any angle indicator, including, but not limited to, a bubble level, a tilt sensor, a tilt indicator, a slope meter, a slope gauge, a gradient meter, a gradiometer, a level gauge, and a level meter.

[0113] Preferably, the level indicator 16034 is a ball or bubble configured to move around the angle indicator 1603 to indicate both the effective loft angle and the effective lie angle of the putter 160.

[0114] The angle indicator 1603 is configured to indicate both the effective loft angle and the effective lie angle of the putter. The angle indicator 1603 may further include markings 16033 defined thereon to provide scales for measuring the effective lie angle and the effective loft angle of the putter 160 when held at address. The markings 16033 may be formed by any suitable method, including, but not limited to, etching, molding, printing, or painting onto the angle indicator 1603.

[0115] 18, according to an example embodiment, the markings 16033 may include a first axis 16031 and a second axis 16032. The first axis 16031 may be oriented such that an imaginary vertical plane including the first axis 16031 extends parallel to the leading edge of the striking face of the putter 160 when the golf club fitting device 1600 is attached. The second axis 16032 may be perpendicular to the first axis 16031 such that an imaginary vertical plane including the second axis 16032 extends parallel to the line of sight when the golf club fitting device 1600 is attached to the putter 160.

[0116] The intersection of the first axis 16031 and the second axis 16032 represents a neutral position of the putter 160 when the effective lie angle and effective loft angle are equal to the prescribed lie angle and prescribed loft angle, respectively. When the level indicator 16034 is located at the intersection of the first axis 16031 and the second axis 16032, the putter 160 can be said to be located in a normal address position and exhibit both the prescribed lie angle and the prescribed loft angle.

[0117] Movement of the level indicator 16034 along the first axis 16031 corresponds to a change in the effective lie angle of the putter 160. Movement of the level indicator 16034 along the second axis 16032 corresponds to a change in the effective loft angle of the putter 160. Thus, movement of the level indicator 16034 in the other direction corresponds to a change in both the effective loft angle and the effective lie angle of the putter 160.

[0118] As an example, the level indicator 16034 as shown in Fig. 18 is not centered on the intersection of the first axis 16031 and the second axis 16032. From the golfer's perspective, in Fig. 18 the level indicator 16034 is offset from the second axis 16032 and is therefore positioned such that the effective lie angle of the putter is too large (i.e., the putter is too upright). The level indicator 16034 is also offset from the first axis 16031 and is therefore positioned such that the effective loft angle is too small (i.e., the putter is pushed too far forward and the grip is too close to the target).

[0119] By adjusting the address position of the putter 160 to center the level indicator 16034 about the intersection of the first axis 16031 and the second axis 16032, the putter 160 can be consistently positioned in a normal address position. By practicing positioning the putter 160 in this manner, a golfer can become skilled at consistently and accurately addressing the golf ball. As detailed above, even slight deviations from the normal address position can result in a missed putt. Thus, the golf club fitting device 1600 greatly aids in improving a golfer's set-up and therefore their performance.

[0120] 18 , in addition to or as an alternative to the first axis 16031 and the second axis 16032, the markings 16033 may include one or more concentric circles centered on the intersection of the first axis 16031 and the second axis 16032. The markings 16033 may include a grid centered on the intersection of the first axis 16031 and the second axis 16032, or a series of individual marks arranged along the first axis 16031 and the second axis 16032. As yet another example, the markings 16033 may include a single point corresponding to a point corresponding to the intersection of the first axis 16031 and the second axis 16032.

[0121] The markings 16033 of the angle indicator 1603 may be configured to indicate a range of deviations from a normal address position for both lie and loft angles of between about -10 degrees to about 10 degrees, preferably between about -5 degrees to about 5 degrees, and most preferably between about -3 degrees to about 3 degrees.

[0122] Another feature of the present invention is a protrusion 16015, which is more clearly shown in FIG. 18, extending from the lower surface 16013 of the second device body 1601. The protrusion 16015 is configured to secure the golf club fitting device 1600 to the head end 16061 of the grip 1606. The protrusion 16015 may be tapered or have a constant diameter. It may include one or more ribs 16016 that are increased in diameter relative to adjacent portions of the protrusion 16015. The protrusion 16015 is sized to fit snugly within a hole formed in the head end 16061 of a conventional golf grip, such as the grip 1606.

[0123] Although not shown in the drawings, in accordance with an alternative embodiment of the present invention, a first magnet may be fixedly attached to the lower surface 16013 of the second device body 1601 and a second magnet may be attached to or integrally formed with the head 16061 of the grip 1606. The first and second magnets may have opposite polarities such that the golf club fitting device 1600 may be removably coupled to the head 16061 of the grip 1606 via magnetic forces.

[0124] According to other alternative embodiments, the golf club fitting device 1600 may be removably coupled to the head end 16061 of the grip 1606 using adhesive or mechanical fasteners such as screws.

[0125] According to an embodiment of the present invention, since the Rules of Golf do not permit moving parts to be attached to a golf club during play, the golf club fitting device may be quickly and easily installed on a golf club for use during practice. The configuration of the golf club fitting device, specifically the angular offset between the upper and lower surfaces of the second device body, offsets the lie angle of the golf club so that the angle indicator may be centered with respect to the ground when installed. The central location of the angle indicator allows for accurate and consistent installation, and allows for accurate and consistent measurement of both the effective loft angle and the effective lie angle by the angle indicator. As a result, a golf club fitting device according to an embodiment of the present invention may uniquely improve a golfer's accuracy and consistency in set-up and therefore in play.

[0126] The present invention also relates to a method of fitting a golf club, the method including the steps of providing a golf club having a head with a loft angle and a shaft extending from the head with a lie angle, attaching a golf club fitting device to a grip of the golf club, measuring an effective loft angle, an effective lie angle, and adjusting the length and / or position of the golf club based on the effective lie angle and the effective loft angle.

[0127] Referring to FIG. 19, a flow chart diagram illustrates a preferred method of club fitting and adjustment in accordance with the present invention. The approaches and techniques illustrated by the flow chart are sufficient to describe at least one implementation of the method. However, other implementations of the method may utilize approaches and techniques different from those shown. It should be understood that the steps of the method outlined in the flow chart are not limited to the order described, rather the steps may be performed in any order and still be within the scope of the present disclosure.

[0128] As shown in FIG. 19 and understood with reference to the golf club fitting device of FIGS. 16-18, first, at 1901, the club fitting device 1600 is attached to the grip 1606 of the putter 160. The club fitting device 1600 may be secured to the grip 1606 with a protrusion 16015, adhesive, or another mechanical fastener, as described in detail above. The golf club fitting device 1600 is positioned on the head 16061 of the grip 1606 such that the upper surface 16012 of the second device body 1601 is parallel to the ground when the putter 160 is held in a normal address position.

[0129] Next, at 1902, the putter 160 is held in the address position and the angle indicators 1603 are read to determine the effective lie angle and effective loft angle of the putter 160. In particular, the angle indicators 1603 may indicate a deviation of the putter 160 from the normal address position.

[0130] Next, at 1903, the position of the putter 160 and / or the putter 160 itself may be adjusted based on the reading at 1902. For example, if the reading of the angle indicator 1603 indicates that at least one of the effective lie angle and the effective loft angle is not at a predetermined level, the putter 160 may be repositioned to ensure that the effective lie angle and the effective loft angle are at a prescribed level. If the golfer is uncomfortable addressing the ball in a manner that ensures that the effective lie angle and the effective loft angle are at a prescribed level, the actual putter 160 may be adjusted or replaced. Adjusting or replacing the putter 160 may include either changing the lie angle of the putter 160, changing the loft angle of the putter 160, or changing the shaft length of the putter 160 to ensure that the effective lie angle and the effective loft angle are at a prescribed level.

[0131] 20 and 21, a grip in accordance with one embodiment of the present invention is disclosed to aid in golf club fitting. Figure 20 is a side view of the grip attached to a golf club in a normal address position. Figure 21 is a side view of the grip.

[0132] As shown in FIG. 20 , the putter 200 includes a putter head 2004. A shaft 2005 is attached to the putter head 2004. A shaft axis 2009 extends from the putter head 2004 through the center of the shaft 2005. When the putter 200 is held in a normal address position (e.g., the predetermined loft and lie angles of the putter are held equal to the effective loft and lie angles of the putter), the shaft axis 2009 is disposed at a lie angle β with respect to the ground plane G. A grip 2006 is attached to the end of the shaft 2005 opposite the putter head 2004. The grip 2006 includes a butt end 20061 adjacent a terminal portion of the shaft 2005 and a distal end 20071 opposite the butt end 20061. The butt end 20061 includes an upper surface 20063 that is substantially planar. The distal end 20071 of the grip 2006 includes a bottom surface 20073 that is substantially planar.

[0133] 21, grip 2006 is shown in greater detail to detail some of its unique features.

[0134] As shown in FIG. 21 , the grip 2006 includes a butt end 20061 at its terminal end. An upper surface 20063 of the butt end 20061 is angled relative to a plane 2011 extending perpendicular to the shaft axis 2009. A bottom surface 20073 of the distal end 20071 may be angled relative to a plane 2021 extending perpendicular to the shaft axis 2009. When the putter 200 is held in a normal address position, the upper surface 20063 of the butt end 20061 may be substantially parallel to the ground plane G, and when the putter 200 is held in a normal address position, the bottom surface 20073 of the distal end 20071 may be substantially parallel to the ground plane G. The upper surface 20063 of the butt end 20061 provides a visual indication as to the effective lie angle and effective loft angle of the putter head 2004. Similarly, the bottom surface 20073 of the distal end 20071 provides a visual indication as to the effective lie angle of the putter head 2004 .

[0135] When the upper surface 20063 of the butt end 20061 and / or the lower surface 20073 of the distal end 20071 are parallel to the ground plane G, the putter 200 is positioned in a normal address position and can be said to achieve both the prescribed lie angle and the prescribed loft angle.

[0136] 21, the critical dimension is a first angle θ1 between a top surface 20063 of the butt end 20061 and a plane 2011 extending perpendicular to the shaft axis 2009. According to an embodiment of the present invention, the angle θ1 can be between about 10° and about 30°, preferably, the first angle θ1 can be between about 15° and about 25°, and most preferably, the first angle θ1 is about 20° and can be complementary to the lie angle β.

[0137] If the first angle θ1 is within this range, the top surface 20063 of the butt end 20061 will be approximately parallel to the ground plane G when the putter 200 is in a normal address position.

[0138] The bottom surface 20073 of the distal end 20071 of the grip 2006 may be oriented such that a second angle θ2 is formed between the bottom surface 20073 of the distal end 20071 of the grip 2006 and a plane 2021 extending perpendicular to the shaft axis 2009. According to an embodiment of the present invention, the second angle θ2 may be between about 10° and about 30°, preferably, the second angle θ2 may be between about 15° and about 25°, and most preferably, the second angle θ2 may be complementary to the lie angle β, β, of about 20°. Thus, the top surface 20063 of the butt end 20061 and the bottom surface 20073 of the distal end 20071 may be parallel to one another.

[0139] 22-24, a golf club fitting device according to an embodiment of the present invention is disclosed. Fig. 22 is a side view of the golf club fitting device attached to a grip of a golf club. Fig. 23 is a side view of the grip and the golf club fitting device. Fig. 24 is a perspective view of the golf club fitting device.

[0140] As shown in FIG. 22, the putter 220 includes a putter head 2204. A shaft 2205 is attached to the putter head 2204. A shaft axis 2209 extends from the putter head 2204 through the center of the shaft 2205. When the putter 220 is held in a normal position (e.g., the putter's prescribed loft and lie angles are held equal to the putter's effective loft and lie angles), the shaft axis 2209 is disposed at a lie angle β with respect to the ground plane G. A grip 2206 is attached to an end of the shaft 2205 opposite the putter head 2204. The grip 2206 includes a butt end 22061 adjacent a terminal portion of the shaft 2205 and a distal end 22071 opposite the butt end 22061. The butt end 22061 includes an upper surface 22063 that is substantially planar. The distal end 22071 of the grip 2206 includes a substantially planar bottom surface 22073. The golf club fitting device 2200 is attached to the putter 220 at the butt end 22061 of the grip 2206.

[0141] 23, the grip 2206 and attached golf club fitting device 2200 are shown in greater detail to elaborate on some of the unique features of the grip 2206 and the golf club fitting device 2200.

[0142] As shown in FIG. 23 , the grip 2206 includes a butt end 22061 at its terminal end. The top surface 22063 of the butt end 22061 is angled relative to a plane 2211 extending perpendicular to the shaft axis 2209. The bottom surface 22073 of the distal end 22071 may be angled relative to a plane 2221 extending perpendicular to the shaft axis 2209. The top surface 22063 of the butt end 22061 may be substantially parallel to the ground plane G when the putter 220 is held in a normal address position, and the bottom surface 22073 of the distal end 22071 may be substantially parallel to the ground plane G when the putter 220 is held in a normal address position. The bottom surface 22073 of the distal end 22071 may provide a visual indication of the effective lie angle and the effective loft angle of the putter head 2204. The golf club fitting device 2200 includes a device body 2201. The device body 2201 may be formed from metal, wood, plastic, or a composite material. According to an exemplary embodiment, the device body 2201 of the golf club fitting device 2200 may be formed from anodized 6061 aluminum.

[0143] The device body 2201 includes a lower surface 22013, an upper surface 22012 opposite the lower surface 22013, and a side surface 22014 connecting the lower surface 22013 and the upper surface 22012. When the golf club fitting device 2200 is attached to the grip 2206, the lower surface 22013 of the device body 2201 may contact an upper surface 22063 of a butt end 22061 of the grip 2206. According to an embodiment of the present invention, the lower surface 22013 of the device body 2201 and the upper surface 22063 of the butt end 22061 may be configured to substantially match one another such that there is little or no gap between the grip 2206 and the golf club fitting device 2200.

[0144] 23, the lower surface 22013 and the upper surface 22012 of the device body 2201 may be formed approximately parallel. Further, the lower surface 22013 of the device body 2201 may be substantially parallel to the upper surface 22063 of the butt end 22061 of the grip 2206. Therefore, when the putter 220 is held in a normal address position, the upper surface 22012 of the device body 2201 may be substantially parallel to the ground plane G.

[0145] Since the lower surface 22013 and the upper surface 22012 of the device body 2201 and the upper surface 22063 of the butt end 22061 of the grip 2206 are substantially parallel, the critical dimension is a first angle θ21 between the surface 22063 of the butt end 22061 and a plane 2211 extending perpendicular to the shaft axis 2209. According to an embodiment of the present invention, the first angle θ21 may be about 10° to about 30°, preferably the first angle θ21 may be about 15° to about 25°, and most preferably the first angle θ21 may be about 20°, and is complementary to the lie angle β.

[0146] If the first angle θ21 is in this range, when the putter 220 is in a normal address position, the top surface 22012 of the device body 2201 is approximately parallel to the ground plane G. The first angle θ21 ultimately controls the orientation of the golf club fitting device 2200 with respect to the ground plane G.

[0147] The bottom surface 22073 of the distal end 22071 of the grip 2206 may be oriented such that a second angle θ22 is formed between the bottom surface 22073 of the distal end 22071 of the grip 2206 and a plane 2221 extending perpendicular to the shaft axis 2209. According to an embodiment of the present invention, the second angle θ22 may be between about 10° and about 30°, preferably the second angle θ22 may be between about 15° and about 25°, and most preferably the second angle θ22 may be about 20°, and is complementary to the lie angle β. Thus, the top surface 22063 of the butt end 22061 and the bottom surface 22073 of the distal end 22071 may be parallel to one another.

[0148] Note that the shaft axis 2209 may not pass exactly through the center of the grip 2206. According to the rules of golf, a putter grip may be asymmetric. For example, as shown in FIG 23, the grip 2206 may have a pistol shape where the circumference of the grip 2206 is greatest near the butt end 22061, where a greater percentage of the grip 2206 is located below the grip 2206 from the golfer's perspective.

[0149] 24, a perspective view of the golf club fitting device 2200 more clearly illustrates some additional features. As shown in FIG 24, the angular indicia 2203 is coupled to the device body 2201 and exposed on a top surface 22012 of the device body 2201. The angular indicia 2203 may be secured to the device body 2201 by a press fit, a snap fit, adhesives, mechanical fasteners, or the like.

[0150] The angle indicator 2203 may further include a level indicator 22034. The angle indicator 2203 may be any angle indicator, including, but not limited to, a bubble level, a tilt sensor, a tilt indicator, a slope meter, a slope gauge, a gradient meter, a gradient meter, a level gauge, and a level meter.

[0151] Preferably, the level indicator 22034 is a ball or bubble configured to move around the angle indicator 2203 to indicate both the effective loft angle and the effective lie angle of the putter 220.

[0152] The angle indicator 2203 is configured to indicate both the effective loft angle and the effective lie angle of the putter. The angle indicator 2203 may further include markings 22033 formed thereon to provide a scale for measuring the effective lie angle and the effective loft angle of the putter 220 at address. The markings 22033 may be formed by any suitable method, including, but not limited to, etching, molding, printing, or painting onto the angle indicator 2203.

[0153] 24, the markings 22033 may include a first axis 22031 and a second axis 22032. The first axis 22031 may be oriented such that an imaginary vertical plane including the first axis 22031 extends parallel to a leading edge of a striking face of the putter 220 when the golf club fitting device 2200 is attached. The second axis 22032 may be perpendicular to the first axis 22031 such that an imaginary vertical plane including the second axis 22032 extends parallel to a line of sight when the golf club fitting device 2200 is attached to the putter 220.

[0154] The intersection of the first axis 22031 and the second axis 22032 represents a neutral position of the putter 220 where the effective lie angle and effective loft angle are equal to the prescribed lie angle and prescribed loft angle, respectively. When the level 22034 is located at the intersection of the first axis 22031 and the second axis 22032, the putter 220 is said to be in a normal address position and exhibits both the prescribed lie angle and the prescribed loft angle.

[0155] Movement of the level indicator 22034 along the first axis 22031 corresponds to a change in the effective lie angle of the putter 220. Movement of the level indicator 22034 along the second axis 22032 corresponds to a change in the effective loft angle of the putter 220. Thus, movement of the level indicator 22034 in the other direction corresponds to a change in both the effective loft angle and the effective lie angle of the putter 220.

[0156] As an example, the level indicator 22034 shown in Figure 24 is not centered on the intersection of the first axis 22031 and the second axis 22032. From a golfer's perspective, the level indicator 22034 in Figure 24 is offset from the second axis 22032 and therefore positioned such that the effective lie angle of the putter is too large (i.e., the putter is too upright). The level indicator 22034 is also offset from the first axis 22031 and therefore positioned such that the effective loft angle is too small (i.e., the putter is pushed too far forward and the grip is too close to the target).

[0157] By adjusting the address position of the putter 220 to center the level indicator 22034 about the intersection of the first axis 22031 and the second axis 22032, the putter 220 can be consistently positioned in a normal address position. By practicing the positioning of the putter 220 in this manner, a golfer can become more adept at consistently and accurately addressing a golf ball. As detailed above, even slight deviations from the normal address position can lead to missed putts. Thus, the golf club fitting device 2200 may be of great help in improving a golfer's set-up and therefore his or her performance.

[0158] 24 , in addition to or instead of the first axis 22031 and the second axis 22032, the markings 22033 may include one or more concentric circles centered on the intersection of the first axis 22031 and the second axis 22032. As another example, the markings 22033 may include a grid centered on the intersection of the first axis 22031 and the second axis 22032, or a series of discrete marks disposed along the first axis 22031 and the second axis 22032. As yet another example, the markings 22033 may include a single point corresponding to the intersection of the first axis 22031 and the second axis 22032.

[0159] The markings 22033 of the angle indicator 2203 may be configured to indicate a range of deviation from a normal address position for both lie and loft angles of between about -10 degrees to about 10 degrees, preferably between about -5 degrees to about 5 degrees, and most preferably between about -3 degrees to about 3 degrees.

[0160] Another feature of the present invention is a protrusion 22015 extending from the underside 22013 of the device body 2201, as shown more clearly in FIG. 24. The protrusion 22015 is configured to secure the golf club fitting device 2200 to the butt end 22061 of the grip 2206. The protrusion 22015 may be tapered or may have a constant diameter and may include one or more ribs 22016 of increased diameter compared to adjacent portions of the protrusion 22015. The protrusion 22015 is sized to fit securely within a hole formed in the butt end 22061 of the grip 2206.

[0161] Although not shown, in accordance with an alternative embodiment of the present invention, a first magnet may be fixedly attached to the underside 22013 of the device body 2201 and a second magnet may be attached to or integrally formed with the underside 22013 of the device body 2201. The first and second magnets may have opposite polarities such that the golf club fitting device 2200 may be removably coupled to the butt end 22061 of the grip 2206 via magnetic forces.

[0162] According to other alternative embodiments, the golf club fitting device 2200 may be removably coupled to the butt end 22061 of the grip 2206 using adhesives or mechanical fasteners such as screws.

[0163] With reference to Figures 25-29, a grip in accordance with one embodiment of the present invention is disclosed for assisting in fitting a golf club. Figure 25 is a perspective view of the grip, Figure 26 is a front view of the grip, Figure 27 is a top view of the grip, Figure 28 is a top view of the grip in a first offset orientation, and Figure 29 is a top view of the grip in a second offset orientation.

[0164] As shown in FIG. 25, a grip 2506 configured for attachment to a shaft having a shaft axis includes a butt end 25061 adjacent a terminal portion of the shaft when attached to the shaft, a distal end 25071 opposite the butt end 25061, and a front portion 25081 facing away from the user in a normal address position.

[0165] 26 and 27, the grip further includes a rear portion 25083, a left portion 25084, and a right portion 25085. The front portion 25081, rear portion 25083, left portion 25084, and right portion 25085 extend along the length of the grip 2506 from the butt end 25061 to the distal end 25071. The front portion 25081 includes a left edge 25087 and a right edge 25089 that extend the length of the grip 2506. The left edge 25087 and the right edge 25089 are symmetrical to one another along a centerline 25009 of the front portion 25081. Moving from the butt end 25061 toward the distal end 25071 of the grip 2506, the left edge 25087 and right edge 25089 taper away from the centerline 25009 of the front portion 25081 and then taper toward the centerline 25009 of the front portion. The left edge 25087 and right edge 25089 of the front portion 25081 serve to improve the feel and alignment of a user gripping the grip 2506. The left edge 25087 and right edge 25089 of the front portion 25081 may be smooth and continuous along the length of the grip 2506.

[0166] 27, a plane 25011 can be formed that includes at least a portion of the left edge 25087 and at least a portion of the right edge 25089. The plane 25011 is parallel to the target line 25022 at a normal address position. The grip 2506 can be attached to the putter such that the plane 25011 is perpendicular to a plane that includes the leading edge of the striking face of the putter. The orientation of the plane 25011 relative to the target line 25022 provides a visual indication of whether the striking face of the putter is perpendicular to the target line, open, or closed.

[0167] As shown in Figure 28, the plane 25011 is angled relative to the target line 25022. This orientation represents a closed position for a right handed golfer with the striking face of the putter causing the ball to be struck to the left of the target line 25022. For a left handed golfer, the orientation shown in Figure 28 represents an open position causing the ball to be struck to the left of the target line 25022.

[0168] As shown in Figure 29, the plane 25011 is angled in the opposite direction relative to the target line 25022 from that shown in Figure 28. The orientation shown in Figure 29 represents the striking face of the putter in an open position for a right handed golfer, which will result in the ball being struck to the right of the target line 25022. For a left handed golfer, the orientation shown in Figure 29 represents a closed position, which will result in the ball being struck to the right of the target line 25022.

[0169] According to another embodiment of the present invention, in the grips described in Figures 25-29, the butt end may have a substantially flat upper surface and be angled with respect to a plane perpendicular to the shaft axis, as shown in Figures 20-21. Additionally, the grips described in Figures 25-29 may be butt ends, which are illustrated in Figures 16-18 or Figures 22-24.

[0170] According to an embodiment of the present invention, since the rules of golf do not permit moving parts to be attached to a golf club during play, the golf club fitting device can be quickly and easily attached to a golf club during practice and used. The configuration of the golf club fitting device, specifically the top surface of the device body that is substantially parallel to the ground in a normal address position, offsets the lie angle of the golf club when attached such that the angle indicator is centered relative to the ground. The centered location of the angle indicator allows for accurate and consistent installation, which in turn allows for accurate and consistent measurement of both the effective loft angle and the effective lie angle by the angle indicator. As a result, the golf club fitting device according to an embodiment of the present invention can uniquely improve the accuracy and consistency of a golfer's setup, and therefore the golfer's accuracy and consistency during play.

[0171] In describing the technology herein, certain features that are described in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various functions that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although technology features may be described above as acting in a particular combination and may initially be claimed as such, one or more features from the claimed combination may in some cases be carved out of the combination, and the claimed combination may be directed to a subcombination or modification of the subcombination.

[0172] Various modifications to the implementations disclosed herein will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other implementations without departing from the spirit or scope of the present disclosure. Thus, the claims are not intended to be limited to the implementations shown herein, but are to be accorded the widest scope consistent with this disclosure and the principles and novel features disclosed herein. The technical features described herein are explained below. [Technical feature 1] 1. A grip for a golf club including a shaft defining a shaft axis and a golf club head connected to a first end of the shaft, the grip being connected to a second end of the shaft opposite the first end, a butt end adjacent a terminal portion of the second end of the shaft, the butt end having a substantially planar upper surface; a distal end opposite the butt end, the top surface of the butt end is formed at a first angle with respect to a first plane perpendicular to the shaft axis, the first angle being between about 10° and about 30°; A grip wherein the top surface of the butt end is substantially parallel to the ground when the golf club is held in a normal address position. [Technical feature 2] The grip described in Technical Feature 1, wherein the first angle is approximately 20°. [Technical feature 3] The grip described in Technical Feature 1, wherein the first angle is complementary to a predetermined lie angle of the shaft axis. [Technical feature 4] the distal end has a substantially flat bottom surface, the bottom surface of the distal end being formed at a second angle relative to a second plane perpendicular to the shaft axis, the second angle being between about 10° and about 30°; The grip according to Technical Feature 1, wherein the bottom surface of the distal end is substantially parallel to the ground when the golf club is held in the normal address position. [Technical feature 5] The grip according to technical feature 4, wherein the second angle is about 20°. [Technical feature 6] A golf club fitting device is attached to the butt end, The golf club fitting device is a device body including a lower surface, an upper surface opposite to the lower surface, and a side surface connecting the upper surface and the lower surface; an angle indicator coupled to the device body and exposed on a top surface of the device body; the device body is adapted to be coupled to the grip such that the lower surface of the device body is adjacent to an upper surface of the butt end; the top surface of the device body is oriented substantially parallel to the ground when the golf club is held in the normal address position; The grip according to Technical Feature 1, wherein the angle indicator is in a neutral position when the golf club is in the normal address position. [Technical feature 7] The grip described in Technical Feature 6, wherein the angle indicator is configured to measure both the effective lie angle of the golf club head and the effective loft angle of the golf club head. [Technical feature 8] The device body further includes a protrusion extending from the lower surface, A grip according to technical feature 6, wherein the protrusion is adapted to removably connect the device body to the butt end. [Technical feature 9] A grip as described in Technical Feature 6, wherein a first magnet is fixedly attached to the underside of the device body, and the first magnet removably couples the device body to the butt end via magnetic force. [Technical feature 10] The grip according to technical feature 6, wherein the angle indicator is a bubble level. [Technical feature 11] The grip described in Technical Feature 6, wherein the angle indicator includes a bubble level, the bubble level being a ball. [Technical feature 12] A grip configured to be attached to a shaft having a shaft axis, a butt end adjacent a distal portion of the shaft; a distal end opposite the butt end; and a front portion, a rear portion, a left portion, and a right portion extending a length of the grip from the butt end to the distal end; left and right edges of the front portion extending the length of the grip; the left edge and the right edge are symmetrical with respect to one another along a centerline of the front portion; a grip wherein, moving in a direction from the butt end to the distal end, the left edge and the right edge move gradually away from the center line of the front portion and then move toward the center line of the front portion. [Technical feature 13] A grip as described in Technical Feature 12, wherein a plane including at least a portion of the left edge and at least a portion of the right edge is parallel to a target line in a normal address position. [Technical feature 14] 13. A grip as described in Technical Feature 12, wherein the left edge and the right edge are smooth and continuous along the length of the grip. [Technical feature 15] A grip as described in Technical Feature 12, wherein when moving in the direction from the butt end to the distal end, the left edge and the right edge gradually approach the center line of the front portion at a position closer to the distal end than to the butt end. [Technical feature 16] the butt end having a substantially planar upper surface; the top surface of the butt end is at a first angle relative to a first plane perpendicular to the shaft axis, the first angle being between about 10° and about 30°; A grip as described in Technical Feature 12, wherein the top surface of the butt end is substantially parallel to the ground plane when the grip is held in a normal address position. [Technical feature 17] The grip described in technical feature 16, wherein the first angle is approximately 20°. [Technical feature 18] 17. The grip of claim 16, wherein the first angle is complementary to a predetermined lie angle of the shaft axis. [Technical feature 19] the distal end has a bottom surface that is substantially planar, the bottom surface of the distal end being formed at a second angle relative to a second plane perpendicular to the shaft axis, the second angle being between about 10° and about 30°; A grip as described in technical feature 16, wherein the bottom surface of the distal end is substantially parallel to the ground plane when the grip is held in the normal address position. [Technical feature 20] 20. The grip of claim 19, wherein the second angle is about 20°. [Explanation of symbols]

[0173] 1600 Golf Club Fitting Device 1601 Device body 16012 Upper surface 16013 Lower surface 16014 Side 16015 Protrusion 16016 Rib 1603 Angle Indicator 16031 First axis 16032 Second axis 16033 Marking 16034 Level indicator 1604 Putter Head 1605 Shaft 1606 Grip 16061 Tip 1609 Shaft axis 1611 A plane perpendicular to the shaft axis 1609

Claims

1. A grip configured to be attached to a shaft having a shaft axis, a butt end adjacent a distal portion of the shaft; a distal end opposite the butt end; and a front portion, a rear portion, a left portion, and a right portion extending a length of the grip from the butt end to the distal end; left and right edges of the front portion extending the length of the grip; the left edge and the right edge are symmetrical with respect to one another along a centerline of the front portion; moving in a direction from the butt end to the distal end, the left edge and the right edge move gradually away from the centerline of the front portion and then toward the centerline of the front portion; the butt end having a substantially planar upper surface; the top surface of the butt end is formed at a first angle with respect to a first plane perpendicular to the shaft axis, the first angle being between 10° and 30°; when the grip is held in a normal address position, the top surface of the butt end is substantially parallel to a ground plane; the distal end has a bottom surface that is substantially planar, the bottom surface of the distal end being formed at a second angle relative to a second plane perpendicular to the shaft axis, the second angle being between 10° and 30°; A grip, wherein the bottom surface of the distal end is substantially parallel to the ground plane when the grip is held in the normal address position.

2. 2. The grip of claim 1, wherein a plane including at least a portion of the left edge and at least a portion of the right edge is parallel to a target line in a normal address position.

3. The grip of claim 1 , wherein the left edge and the right edge are smooth and continuous along the length of the grip.

4. 2. The grip of claim 1, wherein moving in the direction from the butt end to the distal end, the left edge and the right edge converge toward the centerline of the front portion closer to the distal end than to the butt end.

5. The grip of claim 1 , wherein the first angle is 20°.

6. 2. The grip of claim 1, wherein the first angle is complementary to a defined predetermined lie angle of the shaft axis.

7. The grip of claim 1 , wherein the second angle is approximately 20°.

Images