Golf club head with adjustable center of gravity

Abstract

A golf club head comprising a slidable weight for adjusting the location of the club head center of gravity is disclosed herein. The club head has an S-shaped channel disposed in its sole and a slidable weight assembly comprising a retention plate, at least one bolt, and a weighted base. The weighted base comprises at least one spherical portion extending from its underside to permit the slidable weight assembly to slide smoothly within the channel, which preferably has a partially tubular cross-section along a vertical Z-axis. The bolt, when tightened, reversibly fixes the slidable weight assembly to a pair of rails extending into the channel from the channel's walls.

Claims

1. A golf club head comprising: a body comprising a hosel, a striking face, a heel side, a toe side, a rear side, a sole, and a channel in the sole; and a slidable weight assembly comprising a retention plate, a weighted base, and at least one bolt having a head portion and a threaded extension portion, wherein the channel comprises a curved floor, a first wall, a second wall, a first rail extending from the first wall, and a second rail extending from the second wall, wherein the channel comprises a first length, wherein the first and second rails each comprise a second length, wherein the first length is greater than the second length, wherein the retention plate comprises a first lower surface, at least one first through-bore, and at least one ledge having a second lower surface that is offset from the first lower surface, wherein the weighted base comprises an upper surface, first and second threaded bores, and first and second spherical portions, wherein the first spherical portion is centered around the first threaded bore, wherein the second spherical portion is centered around the second threaded bore, wherein the head portion rests against the at least one ledge within the first through-bore when the bolt is engaged with the retention plate, wherein the threaded extension portion is sized to engage at least one of the first and second threaded bores, wherein the bolt reversibly fixes the slidable weight to the rails, and wherein the retention plate does not make contact with the weighted base when the slidable weight assembly is fixed within the channel.

2. The golf club head of claim 1, wherein the golf club head is selected from the group consisting of a driver-type head, a fairway wood-type head, and a hybrid-type head.

3. The golf club head of claim 1, wherein the channel extends from the heel side to the toe side and from a location proximate the striking face to a location proximate the rear side.

4. The golf club head of claim 1, wherein the channel has a cross-section along a vertical Z axis that is partially tubular in shape.

5. The golf club head of claim 1, further comprising a composite crown, wherein the body is composed of a metal alloy.

6. The golf club head of claim 5, wherein the metal alloy is selected from the group consisting of titanium alloy and steel.

7. The golf club head of claim 1, wherein the slidable weight assembly is approximately oval in shape.

8. A golf club head comprising: a body comprising a hosel, a striking face, a heel side, a toe side, a rear side, a sole, and a channel in the sole; and a slidable weight assembly comprising a retention plate, a weighted base, and at least one bolt having a head portion and a threaded extension portion, wherein the channel comprises a curved floor, a first wall, a second wall, a first rail extending from the first wall, and a second rail extending from the second wall, wherein the channel comprises a first length, wherein the first and second rails each comprise a second length, wherein the first length is greater than the second length, wherein the retention plate comprises a first lower surface, at least one first through-bore, and at least one ledge having a second lower surface that is offset from the first lower surface, wherein the weighted base comprises an upper surface, at least one threaded bore, and at least one spherical portion centered around the at least one threaded bore, wherein the head portion rests against the at least one ledge within the first through-bore when the bolt is engaged with the retention plate, wherein the threaded extension portion is sized to engage the at least one threaded bore, wherein the bolt reversibly fixes the slidable weight to the rails, wherein the retention plate does not make contact with the weighted base when the slidable weight assembly is fixed within the channel, wherein the hosel comprises a second through-bore, and wherein the second through-bore communicates with the channel in the sole.

9. A golf club head comprising: a body comprising a hosel, a striking face, a heel side, a toe side, a rear side, a sole, and an S-shaped channel in the sole; and a slidable weight assembly comprising a retention plate, a weighted base, and at least one bolt having a head portion and a threaded extension portion, wherein the channel comprises a curved floor, a first wall, a second wall, a first rail extending from the first wall, and a second rail extending from the second wall, wherein the channel comprises a first length, wherein the first and second rails each comprise a second length, wherein the first length is greater than the second length, wherein the retention plate comprises a first lower surface, at least one first through-bore, and at least one ledge having a second lower surface that is offset from the first lower surface, wherein the weighted base comprises an upper surface, at least one threaded bore, and at least one spherical portion centered around the at least one threaded bore, wherein the head portion rests against the at least one ledge within the first through-bore when the bolt is engaged with the retention plate, wherein the threaded extension portion is sized to engage the at least one threaded bore, wherein the bolt reversibly fixes the slidable weight to the rails, and wherein the retention plate does not make contact with the weighted base when the slidable weight assembly is fixed within the channel.

10. A golf club head comprising: a body comprising a hosel, a striking face, a heel side, a toe side, a rear side, a sole, and a channel in the sole; and a slidable weight assembly comprising a retention plate, a weighted base, and at least one bolt having a head portion and a threaded extension portion, wherein the channel comprises a curved floor, a first wall, a second wall, a first rail extending from the first wall, and a second rail extending from the second wall, wherein each of the first and second rails is angled towards the sole with respect to the curved floor of the channel, wherein the channel comprises a first length, wherein the first and second rails each comprise a second length, wherein the first length is greater than the second length, wherein the retention plate comprises a first lower surface, at least one first through-bore, and at least one ledge having a second lower surface that is offset from the first lower surface, wherein the weighted base comprises an upper surface, at least one threaded bore, and at least one spherical portion centered around the at least one threaded bore, wherein the head portion rests against the at least one ledge within the first through-bore when the bolt is engaged with the retention plate, wherein the threaded extension portion is sized to engage the at least one threaded bore, wherein the bolt reversibly fixes the slidable weight to the rails, and wherein the retention plate does not make contact with the weighted base when the slidable weight assembly is fixed within the channel.

11. A golf club head comprising: a body comprising a hosel, a striking face, a heel side, a toe side, a rear side, a sole, and a channel in the sole; and a slidable weight assembly comprising a weighted base composed of a tungsten alloy, a retention plate composed of stainless steel, and at least one bolt having a head portion and a threaded extension portion, wherein the channel comprises a curved floor, a first wall, a second wall, a first rail extending from the first wall, and a second rail extending from the second wall, wherein the channel comprises a first length, wherein the first and second rails each comprise a second length, wherein the first length is greater than the second length, wherein the retention plate comprises a first lower surface, at least one first through-bore, and at least one ledge having a second lower surface that is offset from the first lower surface, wherein the weighted base comprises an upper surface, at least one threaded bore, and at least one spherical portion centered around the at least one threaded bore, wherein the head portion rests against the at least one ledge within the first through-bore when the bolt is engaged with the retention plate, wherein the threaded extension portion is sized to engage the at least one threaded bore, wherein the bolt reversibly fixes the slidable weight to the rails, and wherein the retention plate does not make contact with the weighted base when the slidable weight assembly is fixed within the channel.

12. A golf club head comprising: a body comprising a hosel, a striking face, a heel side, a toe side, a rear side, a sole, and a channel in the sole; and a slidable weight assembly comprising a retention plate, a weighted base, and at least one bolt having a head portion and a threaded extension portion, wherein the channel comprises a curved floor, a first wall, a second wall, a first rail extending from the first wall, and a second rail extending from the second wall, wherein the channel comprises a first length, wherein the first and second rails each comprise a second length, wherein the first length is greater than the second length, wherein the retention plate comprises a first lower surface, at least one first through-bore, and at least one ledge having a second lower surface that is offset from the first lower surface, wherein the weighted base comprises an upper surface, at least one threaded bore, and at least one spherical portion centered around the at least one threaded bore, wherein the head portion rests against the at least one ledge within the first through-bore when the bolt is engaged with the retention plate, wherein the threaded extension portion is sized to engage the at least one threaded bore, wherein the bolt reversibly fixes the slidable weight to the rails, wherein the retention plate does not make contact with the weighted base when the slidable weight assembly is fixed within the channel, wherein the slidable weight assembly comprises a receiving opening between the first lower surface of the retention plate and the upper surface of the weighted base, and wherein the receiving opening is sized to receive at least a portion of the first and second rails.

13. A wood-type golf club head comprising: a metal body comprising a hosel, a striking face, a heel side, a toe side, a rear side, a sole, and an S-shaped channel in the sole; a composite crown; and an oval-shaped slidable weight assembly comprising a retention plate, a weighted base, and at least one bolt having a head portion and a threaded extension portion, wherein the channel comprises a curved floor, a first wall, a second wall, a first rail extending from the first wall at an angle with respect to the curved floor, and a second rail extending from the second wall at an angle with respect to the curved floor, wherein the weighted base comprises at least one threaded bore and at least one spherical portion centered around the at least one threaded bore, wherein the retention plate comprises at least one first through-bore, wherein the hosel comprises a second through-bore, wherein the second through-bore communicates with the channel in the sole, wherein the threaded extension portion is sized to engage the at least one threaded bore, wherein the bolt reversibly fixes the slidable weight to the rails, and wherein the retention plate does not make contact with the weighted base when the slidable weight assembly is fixed within the channel.

14. The wood-type golf club head of claim 13, wherein the at least one threaded bore comprises first and second threaded bores, wherein the at least one spherical portion comprises first and second spherical portions, wherein the first spherical portion is centered around the first threaded bore, and wherein the second spherical portion is centered around the second threaded bore.

15. The wood-type golf club head of claim 13, wherein the weighted base is composed of a first material having a first density, wherein the retention plate is composed of a second material having a second density, and wherein the first density is greater than the second density.

16. The wood-type golf club head of claim 15, wherein the first material is a tungsten alloy and wherein the second material is stainless steel.

17. The wood-type golf club head of claim 13, wherein a first portion of the channel extends from the heel side to the toe side, wherein a second portion of the channel extends from the toe side towards the rear side, wherein a third portion of the channel extends from a location proximate the rear side towards the striking surface, and wherein a fourth portion of the channel extends from a location proximate the heel side towards the rear side.

18. The wood-type golf club head of claim 13, wherein the channel comprises a first length, wherein the first and second rails each comprise a second length, and wherein the first length is greater than the second length.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 is a top plan view of a golf club head of the present invention.

(2) FIG. 2 is a sole perspective view of the embodiment shown in FIG. 1.

(3) FIG. 3 is a sole elevational view of the embodiment shown in FIG. 1.

(4) FIG. 4 is a cross-sectional view of the embodiment shown in FIG. 3 along lines 4-4.

(5) FIG. 5 is a perspective view of the slidable weight shown in FIGS. 2-4.

(6) FIG. 6 is a partially translucent view of the slidable weight shown in FIG. 5.

(7) FIG. 7 is an exploded view of the slidable weight shown in FIG. 5.

(8) FIG. 8 is another exploded view of the slidable weight shown in FIG. 5.

DETAILED DESCRIPTION OF THE INVENTION

(9) The design approaches described herein are based on a construction used in a driver head characterized by a composite crown adhesively bonded to a cast titanium body. This particular construction approach permits the crown configuration to be adapted to the inventive weighting scheme with minimal impact on weight and function. However, the weighting embodiments disclosed herein can be used with other constructions, including all titanium, all composite, and a composite body with metal face cup. The embodiments may also work in conjunction with at least one adjustable weight port on the club head. Shifting weight along the channel described herein allows for control of center of gravity location and adjustment of other mass properties.

(10) A preferred embodiment of the present invention is shown in FIGS. 1-8. The golf club head 10, which preferably is a driver or a large fairway wood, comprises a body 20 having a face 22, a heel side 23 proximate a hosel 26, a toe side 25, a rear edge 28, a sole 40, and an upper opening (not shown) that is covered by a separately formed crown 30. The hosel 26 has a through-bore 27 that extends into the sole 40 and connects with an elongated, S-shaped channel 50. The hosel 26 preferably has a structure that permits loft, lie, and face angle adjustability, including any of the structures disclosed in U.S. Pat. Nos. 8,641,554, 8,684,859, 8,696,486, 8,715,103, 8,715,104, 8,727,906, and 8,801,537, the disclosure of each of which is hereby incorporated by reference in its entirety herein.

(11) As shown in FIGS. 2 and 3, the channel 50 extends from the heel side 23 to the toe side 25 and then doubles back across the sole 40, though in alternative embodiments the channel 50 may extend onto a ribbon or skirt portion or even onto the crown 30 of the golf club head 10. The S-shape of the channel 50 allows the weight to be moved along both the Y axis (heel side 23 to toe side 25) and the X axis (face 22 to rear edge 28) without having multiple channels—in other words, the single channel 50 of the present invention allows for greater mass property, and particularly center of gravity, adjustability than other club heads having only a single channel 50. If the channel 50 extends onto the ribbon or crown 30, then the mass properties of the club head 10 can be adjusted along the vertical Z axis as well.

(12) The channel 50 includes a pair of rails 52, 54 that extend away from the side walls 51, 53 of the channel 50 parallel to one another. The rails 52, 54 terminate less than 1 inch from the end of the channel 50 to form an open area 55 located proximate the through-bore 27, thereby creating an entry region where a slidable weight assembly 100 can be inserted into the channel 50. In an alternative embodiment, however, the rails 52, 54 may extend the entire length of the channel 50 and the slidable weight assembly 100 can be inserted piecemeal into the channel 50. As shown in FIG. 4, the channel 50 has a smoothly rounded cross-section, such that it is partially tubular in shape, and the rails 52, 54 are angled slightly towards the sole 40 with respect to the rounded floor 56 of the channel 50.

(13) The slidable weight assembly 100 of the present invention is unique in its curvature and shape. As shown in FIGS. 4-8, the slidable weight assembly 100 has an approximately oval shape and includes a weighted base 110 with two threaded bores 112, 114 and two spherical portions 116, 118 disposed around the threaded bores 112, 114. The spherical portions 116, 118 approximate the curvature of the channel 50 to allow the slidable weight assembly 100 to glide easily within the channel 50 during adjustment without getting snagged in the channel 50 at corners 57 where the channel 50 doubles back across the sole 40. The slidable weight assembly 100 also includes pair of bolts 130, each having a head portion 132 and a threaded extension portion 134, and a retention plate 120 with two through-bores 122, 124, each including a ledge 123, 125 against which the head portion 132 abuts when the threaded extension portions 134 are fully engaged with the threaded bores 112, 114 of the weighted base 110. As shown in FIG. 8, the ledges 123, 125 preferably form a ledge lower surface 126 that is offset from a main lower surface 128 of the retention plate 120. This offset feature creates a receiving opening 129 where the rails 52, 54 can fit between the retention plate 120 and the weighted base 110, so that the bolts 130 need only be loosened a small amount to allow the slidable weight assembly 100 to move along the rails 52, 54.

(14) Once the slidable weight assembly 100 has been moved to a desired location on the rails 52, 54 within the channel 50, the slidable weight assembly 100 is semi-permanently fixed in place with the bolts 130, which pull the retention plate 120 and weighted base 110 towards each other, thus creating a clamping force on the rails 52, 54. Preferably, as shown in FIG. 4, neither the lower ledge surface 126 or the main lower surface 128 of the retention plate 120 makes contact with an upper surface 115 of the weighted base 110, such that there is a small gap 105 between these two pieces when the bolts 130 are fully tightened within the threaded bores 112, 114. This spacing prevents the retention plate 120 from ratting against the weighted base 110 when the golf club head 10 is in use.

(15) In the first and second embodiments disclosed herein, the body 20 of the golf club head 10 preferably is formed from a metal material, while the crown 30 is formed from a non-metal material such as composite. In other embodiments, the golf club head 10 may have a multi-material composition such as any of those disclosed in U.S. Pat. Nos. 6,244,976, 6,332,847, 6,386,990, 6,406,378, 6,440,008, 6,471,604, 6,491,592, 6,527,650, 6,565,452, 6,575,845, 6,478,692, 6,582,323, 6,508,978, 6,592,466, 6,602,149, 6,607,452, 6,612,398, 6,663,504, 6,669,578, 6,739,982, 6,758,763, 6,860,824, 6,994,637, 7,025,692, 7,070,517, 7,112,148, 7,118,493, 7,121,957, 7,125,344, 7,128,661, 7,163,470, 7,226,366, 7,252,600, 7,258,631, 7,314,418, 7,320,646, 7,387,577, 7,396,296, 7,402,112, 7,407,448, 7,413,520, 7,431,667, 7,438,647, 7,455,598, 7,476,161, 7,491,134, 7,497,787, 7,549,935, 7,578,751, 7,717,807, 7,749,096, and 7,749,097, the disclosure of each of which is hereby incorporated in its entirety herein.

(16) From the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof, and other embodiments illustrated in the accompanying drawings, numerous changes, modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claims. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.