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Publication numberUS20030119602 A1
Publication typeApplication
Application numberUS 10/274,812
Publication dateJun 26, 2003
Filing dateOct 21, 2002
Priority dateJul 13, 2000
Also published asCA2415721A1, WO2002005902A1
Publication number10274812, 274812, US 2003/0119602 A1, US 2003/119602 A1, US 20030119602 A1, US 20030119602A1, US 2003119602 A1, US 2003119602A1, US-A1-20030119602, US-A1-2003119602, US2003/0119602A1, US2003/119602A1, US20030119602 A1, US20030119602A1, US2003119602 A1, US2003119602A1
InventorsThomas Kennedy, Steven Mahaffey
Original AssigneeSpalding Sports Worldwide, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Golf club head with high strength insert
US 20030119602 A1
Abstract
An iron type golf club head includes a forged body having a striking face area containing a recess and a high strength insert secured within the recess with an outer surface of the recess being flush with a non-recessed portion of the striking face area. The bottom of the body portion extends rearwardly and upwardly to define an undercut area in the bottom portion behind the insert. Owing to the recess and the undercut area, the weight of the body is distributed around the perimeter and toward the bottom to increase the moment of inertia and decrease rotation of the club head.
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Claims(14)
What is claimed is:
1. A golf club head of the iron type, comprising
(a) a body having top, bottom, toe, and heel portions and a striking face area containing a recess;
(b) an insert secured within said recess, an outer surface of said insert being substantially flush with a non-recessed portion of said striking face area; and
(c) said body bottom portion extending rearwardly and upwardly to a location below the top portion of said body and spaced from a rear surface of said insert to define an undercut area in said bottom portion behind said insert, the thickness of said rearwardly extending bottom portion at the rear of said insert being less that the thickness of said insert, whereby weight is distributed around the perimeter of the body and toward the bottom portion thereof to increase the moment of inertia and decrease rotation of the club head.
2. A golf club head as defined in claim 1, wherein said upwardly extending bottom portion terminates in a top wall which is below a vertical midpoint of said body.
3. A golf club head as defined in claim 2, wherein said top wall extends between said toe and heel portions of said body.
4. A golf club head as defined in claim 3, wherein said top wall has a convex configuration.
5. A golf club head as defined in claim 1, wherein said body portion is formed of a forged metal.
6. A golf club head as defined in claim 5, wherein said insert is formed of a high strength metal.
7. A golf club head as defined in claim 6, wherein said insert is formed of hardened steel.
8. A golf club head as define in claim 7, wherein said insert is connected with said body by welding.
9. A golf club head of the iron type, comprising
a body having top, bottom, toe, and heel portions and a striking face arranged between said top, bottom, toe and heel portions, said body bottom portion extending rearwardly and upwardly to a location below the top portion of said body and spaced from a rear surface of said striking face portion to define an undercut area in said bottom portion behind said striking face portion, the thickness of said rearwardly extending bottom portion at the rear of said striking face portion being less than the thickness of said striking face portion, whereby weight is distributed around the perimeter of the body and toward the bottom portion thereof to increase the moment of inertia and decrease rotation of the club head.
10. A golf club head as defined in claim 9, wherein said upwardly extending bottom portion terminates in a top wall which is below a vertical midpoint of said body.
11. A gold club head as defined in claim 10, wherein said top wall extends between said toe and heel portions of said body.
12. A golf club head as defined in claim 11, wherein said top wall has a convex configuration.
13. A golf club head as defined in claim 9, wherein said body is formed of a cast metal.
14. A golf club head as defined in claim 9, wherein said body is formed of a forged metal.
Description
  • [0001]
    This application is a continuation-in-part of U.S. application Ser. No. 09/615,034 filed Jul. 13, 2000.
  • BACKGROUND OF THE INVENTION
  • [0002]
    The majority of golf club heads of the iron type are made of metal, and many have recesses for receiving an insert for the striking face. In addition, golf club irons are either blades or have a cavity back defined by redistributing the weight of the club head around the perimeter thereof. Perimeter weighted clubs are recognized as increasing the moment of inertia, which increases head stability and lessens head rotation that imparts side spin on the ball. Accordingly, with perimeter weighted clubs, a golfer can hit a straighter shot, even when the ball is not struck in the center or “sweet spot” of the club face.
  • [0003]
    Metal golf club irons are generally forged or cast in a mold. Forged club heads are generally softer and provide a greater feel to the golfer, while cast club heads are harder because they can be formed of a higher strength metal than forged club heads. The present invention relates to an improved perimeter weighted club head including an insert for the striking face which is formed of a high strength material.
  • BRIEF DESCRIPTION OF THE PRIOR ART
  • [0004]
    It is known in the patented prior art to provide golf club heads with inserts for the striking face as shown by the U.S. Pat. No. 5,827,131 to Mahaffey and Anderson U.S. Pat. Nos. 5,024,437, 5,094,383, 5,344,140, and 5,261,664. The Mahaffey patent, for example discloses a laminated lightweight insert for golf club heads of both the wood and iron type. The Anderson patents disclose iron type golf club heads having a cast metal head and a forged insert for the striking face. While these prior heads perform satisfactorily, they do not afford the golfer with the desired feel when striking a golf ball.
  • [0005]
    Also known in the art are perimeter weighted, cavity back style golf club irons as shown by the U.S. Pat. No. 5,749,795 to Schmidt. As shown therein, an iron golf club head has a first recess extending rearwardly of the striking face and an undercut recess which extends toward the top and bottom wall of the head behind the striking face. Such a head is an improvement over the prior perimeter weighted heads but still lacks a concentration of weight toward the bottom of the head.
  • SUMMARY OF THE INVENTION
  • [0006]
    Accordingly, it is a primary object of the present invention to provide an iron type golf club head including a body having top, bottom, toe and heel portions and a striking face area containing a recess. An insert is secured within the recess, with an outer surface of the insert being flush with a non-recessed portion of the striking face area. The bottom portion of the body comprises the sole of the club head. It extends rearwardly and upwardly from the lower portion of the striking face area in spaced relation from the rear surface of the insert to define an undercut area in the sole behind the insert. The weight of the club head is thus distributed around the perimeter of the body and toward the sole to increase the moment of inertia and decrease rotation of the club head when it strikes a golf ball.
  • [0007]
    According to a further object of the invention, the thickness of the sole behind the insert is less than the thickness of the insert. The upwardly extending portion at the rear of the sole terminates in a top wall which is below the vertical midpoint of the body to concentrate the weight of the head toward the bottom. The sole top wall extends between the toe and heel portions of the body and has a convex configuration.
  • [0008]
    The head body portion is formed of a forged metal such as carbon steel and the insert is formed of a high strength metal such as hardened steel or a rolled sheet material. With such a combination of materials, the golf club head provides improved feel to the golfer and the high strength insert provides maximum distance to the flight of the golf ball.
  • BRIEF DESCRIPTION OF THE FIGURES
  • [0009]
    Other objects and advantages of the invention will become apparent from a study of the following specification when viewed in the light of the accompanying drawings, in which:
  • [0010]
    [0010]FIG. 1 is a front plan view of the iron type golf club head according to the invention;
  • [0011]
    [0011]FIG. 2 is a left side view of the head of FIG. 1;
  • [0012]
    [0012]FIG. 3 is a rear plan view of the head of FIG. 1;
  • [0013]
    [0013]FIG. 4A is a sectional view of the head taken along line 4-4 of FIG. 1
  • [0014]
    [0014]FIGS. 4B and 4C are sectional views of alternate embodiments, respectively, of the head taken along line 4-4 of FIG. 1;
  • [0015]
    [0015]FIG. 5 is a front plan view of an alternate embodiment of the iron type golf club head according to the invention;
  • [0016]
    [0016]FIG. 6 is a sectional view of the head of FIG. 5 taken along line 6-6;
  • [0017]
    [0017]FIG. 7 is a front plan view of a further embodiment of the iron type golf club head according to the invention; and
  • [0018]
    [0018]FIG. 8 is a sectional view of the head of FIG. 7 taken along line 8-8.
  • DETAILED DESCRIPTION
  • [0019]
    As shown in FIGS. 1-3, the golf club head 2 according to the invention includes a frame or body 4 having toe 4 a, heel 4 b, top 4 c and bottom 4 d portions and a striking face area 6 containing a recess 8. An insert 10 is secured within the recess, preferably by welding although other conventional connection methods may be used. The outer surface 10 a of the insert is substantially flush with a non-recessed portion 6 a of the striking face area.
  • [0020]
    The body 4 is preferably formed of a forged metal such as carbon steel having an amorphous microstructure and the insert is formed of a high strength material such as hardened steel. One example of a hardened steel is a high chrome content steel known as alpha Maraging steel. Alternatively, the insert can also be formed of a rolled sheet material or a forged metal.
  • [0021]
    As shown in FIGS. 3 and 4A, the bottom portion 4 d of the body comprises the sole of the club. The bottom portion extends rearwardly 4 e from the front of the club and upwardly 4 f to a location below the top portion 4 c of the body and spaced from the rear surface of the insert. The sole thus defines an undercut area 12 in the bottom portion of the body behind the insert. The thickness t of the body at the intersection of the rearwardly extending sole bottom portion 4 e and the upwardly extending sole bottom portion 4 f is less than the thickness of the insert. Thus, if the thickness of the insert is between 1.0 and 4.0 mm, and preferably between 2.0 and 2.5 mm, the thickness t is less than the insert thickness. The forward surface of the upwardly extending sole bottom portion 4 f is preferably parallel to the rear surface of the insert so that the width of the undercut area defined between the insert 10 and the portion 4 f is constant. Alternatively, the forward surface of the upwardly extending sole bottom portion 4 f may be angled inwardly as shown in phantom in FIG. 4A so that the width of the undercut area tapers toward the bottom thereof.
  • [0022]
    The top wall 4 g of the upwardly extending sole bottom portion 4 f extends between the toe and heel portions of the body and has a convex configuration as shown in FIG. 3. The top wall is arranged below the vertical midpoint of the body so that the weight of the body is concentrated toward the bottom portion of the body. Since the body contains a recess, weight is also distributed about the perimeter of the body. This weight distribution increases the moment of inertia of the club head and decreases rotation of the head when it is used to strike a golf ball.
  • [0023]
    [0023]FIGS. 4B and 4C illustrate alternate arrangements of rearwardly extending sole bottom portion 4 e of the body. In both embodiments, the bottom portion of the insert extends closer to the bottom of the body than in the embodiment of FIG. 4A and the thickness of the rearwardly extending sole bottom portion 4 e is less than in the embodiment of FIG. 4A.
  • [0024]
    In the embodiment of FIG. 4B, a lip 4 h is provided in the rearwardly extending sole bottom portion 4 d to provide a surface against which the back of the insert abuts. Immediately behind the insert, the thickness t of the rearwardly extending sole bottom portion is less than the thickness of the insert. Thus, the deepest portion of the undercut 12 is immediately behind the insert. In the embodiment of FIG. 4A, the deepest portion of the undercut is at the junction of the rearwardly extending sole bottom portion 4 e and the upwardly extending sole bottom portion 4 f.
  • [0025]
    In the embodiment of FIG. 4C, the lip 4 h is more pronounced and extends upwardly into the undercut to provide a greater surface against which the insert abuts. The thinnest portion of the rearwardly extending sole bottom portion is right behind the lip 4 h. The thickness t at this location is less than the thickness of the insert.
  • [0026]
    In FIGS. 5 and 6, there is shown a further embodiment of the invention wherein the insert 110 extends between the top 104 c and bottom 104 d of the head as shown in FIG. 5. In this embodiment, the insert 110 is adhesively secured to the body or welded thereto, with the weld line extending around the perimeter of the insert. As in the embodiments of FIGS. 4B and 4C, the deepest portion of the undercut is immediately behind the insert. This is due to the fact that the thinnest portion of the rearwardly extending sole bottom portion is directly behind the insert, with the thickness t at this location being less than the thickness of the insert.
  • [0027]
    In FIGS. 7 and 8, there is shown a further embodiment of the invention wherein the golf club head has a unitary construction and is preferably formed of a cast metal. The body 204 is similar in configuration to the body of FIGS. 1-3 and thus has toe 204 a, heel 204 b, top 204 c, and bottom 204 d portions. In lieu of an insert, the body has an integral striking face 210. The head bottom portion includes a rearwardly extending sole bottom portion 204 e and an upwardly extending sole bottom portion 204 f which extends between the toe and heel portions to define an undercut region 212 behind the striking face 210. The top wall 204 g of the upwardly extending sole bottom portion 204 f has a convex configuration and is below the vertical midpoint of the body. The thickness t of the sole bottom portion 204 e behind the striking face at the bottom of the undercut portion is less than the thickness of the striking face.
  • [0028]
    The iron type golf club head of the invention provides improved feel to the golfer because the forged body is softer and thus provides feedback to the golfer when a ball is struck. Maximum distance in the flight of the ball is obtained by using the higher strength insert. The perimeter weighting of the club provides a larger “sweet spot” in the club striking face so that less precision is required when hitting the ball. The concentration of weight toward the bottom of the head increases the trajectory of the ball and enables the golfer to get the ball airborne from difficult lies. By reducing the thickness of the sole behind the striking face insert, more weight is available for re-distribution toward the perimeter of the club and/or rearward in the sole.
  • [0029]
    While the club head of the invention has been described as comprising separate body and striking face insert components, it will be appreciated that the body and striking face can be formed as an integral unit, either cast or forged. The integral head would have the same appearances as in the drawings, except that the striking face would not comprise a separate element.
  • [0030]
    While in accordance with the provisions of the patent statute the preferred forms and embodiments of the invention have been illustrated and described, it will be apparent to those of ordinary skill in the art that various changes and modifications may be made without deviating from the inventive concepts set forth above.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US5176384 *May 31, 1989Jan 5, 1993Yamaha CorporationIron type golf club head
US5263717 *Jul 10, 1992Nov 23, 1993Mccallister JohnGolf club with swing directing ridge
US5301946 *Jan 19, 1993Apr 12, 1994Callaway Golf CompanyIron golf club head with dual intersecting recesses and associated slits
US5330187 *Apr 30, 1993Jul 19, 1994Callaway Golf CompanyIron golf club head with dual intersecting recesses
US5437456 *Apr 11, 1994Aug 1, 1995Callaway Golf CompanyIron golf club head with dual intersecting recesses and associated slits
US5485997 *Oct 17, 1994Jan 23, 1996Callaway Golf CompanyGolf putter head with face plate insert having heightened medial portion
US5588923 *Apr 6, 1995Dec 31, 1996Callaway Golf CompanyGolf club head with attached selected swing weight composite
US5776010 *Jan 22, 1997Jul 7, 1998Callaway Golf CompanyWeight structure on a golf club head
US5971868 *Nov 18, 1997Oct 26, 1999Callaway Golf CompanyContoured back surface of golf club face
US6042486 *Nov 4, 1997Mar 28, 2000Gallagher; Kenny A.Golf club head with damping slot and opening to a central cavity behind a floating club face
US6210290 *Jun 11, 1999Apr 3, 2001Callaway Golf CompanyGolf club and weighting system
US6440010 *Nov 29, 2001Aug 27, 2002Callaway Golf CompanyGolf club head with weighting member and method of manufacturing the same
US6517448 *Mar 30, 2000Feb 11, 2003K.K. Endo SeisakushoGolf club and method for manufacturing the same
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6875124 *Jun 2, 2003Apr 5, 2005Acushnet CompanyGolf club iron
US7390270Jul 26, 2005Jun 24, 2008Roger Cleveland Golf Company, Inc.Muscle-back, with insert, iron type golf club head
US7563176Oct 29, 2007Jul 21, 2009Roger Cleveland Golf Company, Inc.Muscle back, with insert, iron type golf club head
US7662050 *Feb 16, 2010Acushnet CompanyIron-type golf clubs
US7731604 *Sep 6, 2007Jun 8, 2010Taylor Made Golf Company, Inc.Golf club iron head
US7771288Aug 13, 2003Aug 10, 2010Acushnet CompanyGolf club head with face insert
US7794333Sep 14, 2010Sri Sports LimitedStrike face insert
US7909708 *Sep 28, 2009Mar 22, 2011Acushnet CompanyGolf club head
US7942757Jul 27, 2010May 17, 2011Sri Sports LimitedStrike face insert
US8083610Dec 27, 2011Sri Sports LimitedMuscle-back, with insert, iron type golf club head
US8105181Jan 31, 2012Sri Sports LimitedStrike face insert
US8128510Mar 16, 2011Mar 6, 2012Acushnet CompanyGolf club head
US8206239Jun 26, 2012Acushnet CompanyGolf club head with face insert
US8328660Dec 11, 2012Sri Sports LimitedMuscle-back, with insert, iron type golf club head
US8419568Apr 16, 2013Sri Sports LimitedMuscle-back, with insert, iron type golf club head
US8535177 *Oct 23, 2007Sep 17, 2013Taylor Made Golf Company, Inc.Golf club head
US8657700Jun 1, 2010Feb 25, 2014Karsten Manufacturing CorporationClub head sets with varying characteristics and related methods
US8690710Jun 1, 2010Apr 8, 2014Karsten Manufacturing CorporationClub head sets with varying characteristics and related methods
US8753230Apr 28, 2011Jun 17, 2014Karsten Manufacturing CorporationClub head sets with varying characteristics
US8821314Mar 13, 2013Sep 2, 2014Dunlop Sports Co. Ltd.Muscle-back, with insert, iron type golf club head
US8840485 *Jul 19, 2013Sep 23, 2014Acushnet CompanyModular golf club
US8956247 *Aug 28, 2012Feb 17, 2015Acushnet CompanyGolf club head with multi-material face
US9005048Apr 4, 2013Apr 14, 2015Karsten Manufacturing CorporationGolf club heads with port structures, tuning elements, and related methods
US9079080Dec 5, 2011Jul 14, 2015Karsten Manufacturing CorporationClub head sets with varying characteristics and related methods
US9220959Jul 19, 2013Dec 29, 2015Cobra Golf IncorporatedGolf club with cellular mass distribution
US20040242339 *Jun 2, 2003Dec 2, 2004Gilbert Peter J.Golf club iron
US20050037859 *Aug 13, 2003Feb 17, 2005Gilbert Peter J.Golf club head with face insert
US20050075191 *Nov 22, 2004Apr 7, 2005Bennett Thomas O.Golf club with vibration dampening pocket
US20060166758 *Jul 26, 2005Jul 27, 2006Roger Cleveland Golf Co., Inc.Muscle-back, with insert, iron type golf club head
US20080058120 *Oct 29, 2007Mar 6, 2008Roger Cleveland Golf Company, Inc.Muscle back, with insert, iron type golf club head
US20080102982 *Sep 6, 2007May 1, 2008Taylor Made Golf Company, Inc.Golf club iron head
US20080207349 *May 6, 2008Aug 28, 2008Acushnet CompanyIron-Type Golf Clubs
US20090239682 *Jun 4, 2009Sep 24, 2009Roger Cleveland Golf Company, Inc.Muscle-back, with insert, iron type golf club head
US20090291774 *Jul 29, 2009Nov 26, 2009Acushnet CompanyGolf club with vibration dampening pocket
US20100029405 *Sep 28, 2009Feb 4, 2010Gilbert Peter JGolf club head
US20100144460 *Feb 11, 2010Jun 10, 2010Gilbert Peter JIron-type golf clubs
US20100292026 *Jul 27, 2010Nov 18, 2010Sri Sports LimitedStrike Face Insert
US20110224016 *Sep 15, 2011Gilbert Peter JGolf club head
US20130040754 *Feb 14, 2013John MorinGolf club head with multi-material face
USD621893Aug 17, 2010Karsten Manufacturing CorporationGolf club head
USD627410Nov 16, 2010Karsten Manufacturing CorporationGolf club head
USD635627Apr 5, 2011Karsten Manufacturing CorporationGolf club head
USD643491Aug 16, 2011Karsten Manufacturing CorporationGolf club head
USD643896Aug 23, 2011Karsten Manufacturing CorporationGolf club head
USD647582Oct 25, 2011Karsten Manufacturing CorporationGolf club head
USD654547Aug 11, 2011Feb 21, 2012Karstern Manufacturing CorporationGolf club head
USD670775Nov 13, 2012Karsten Manufacturing CorporationGolf club head
USD672417Dec 11, 2012Karsten Manufacturing CorporationGolf club head
USD680603Apr 23, 2013Karsten Manufacturing CorporationGolf club head
USD681143Apr 30, 2013Karsten Manufacturing CorporationGolf club head
USD708688May 16, 2013Jul 8, 2014Karsten Manufacturing CorporationGolf club head
USD716883May 29, 2014Nov 4, 2014Karsten Manufacturing CorporationGolf club head
USD720413May 28, 2014Dec 30, 2014Karsten Manufacturing CorporationGolf club head
USD754269Sep 5, 2014Apr 19, 2016Karsten Manufacturing CorporationGolf club head
USD754806Jan 5, 2015Apr 26, 2016Karsten Manufacturing CorporationGolf club head
Classifications
U.S. Classification473/342, 473/349, 473/350
International ClassificationA63B53/04
Cooperative ClassificationA63B53/04, A63B2053/0416, A63B53/047, A63B2209/00
European ClassificationA63B53/04
Legal Events
DateCodeEventDescription
Jan 9, 2003ASAssignment
Owner name: SPALDING SPORTS WORLDWIDE, INC., MASSACHUSETTS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KENNEDY, THOMAS J., III;MAHAFFEY, STEVEN J.;REEL/FRAME:013347/0100;SIGNING DATES FROM 20030108 TO 20030109
Jun 2, 2003ASAssignment
Owner name: THE TOP-FLITE GOLF COMPANY, MASSACHUSETTS
Free format text: CHANGE OF NAME;ASSIGNOR:SPALDING SPORTS WORLDWIDE, INC.;REEL/FRAME:013753/0072
Effective date: 20030528
Sep 26, 2003ASAssignment
Owner name: CALLAWAY GOLF COMPANY, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TOP-FLITE GOLF COMPANY, THE;REEL/FRAME:014007/0688
Effective date: 20030915