US20030220154A1 - Apparatus for reducing unwanted asymmetric forces on a driver head during a golf swing - Google Patents

Apparatus for reducing unwanted asymmetric forces on a driver head during a golf swing Download PDF

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Publication number
US20030220154A1
US20030220154A1 US10/063,903 US6390302A US2003220154A1 US 20030220154 A1 US20030220154 A1 US 20030220154A1 US 6390302 A US6390302 A US 6390302A US 2003220154 A1 US2003220154 A1 US 2003220154A1
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United States
Prior art keywords
club head
golf club
striking face
discontinuity
trip strip
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Abandoned
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US10/063,903
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Albert Anelli
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Individual
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Individual
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Priority to US10/063,903 priority Critical patent/US20030220154A1/en
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0466—Heads wood-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0437—Heads with special crown configurations
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/10—Characteristics of used materials with adhesive type surfaces, i.e. hook and loop-type fastener
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/01—Special aerodynamic features, e.g. airfoil shapes, wings or air passages
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/006—Surfaces specially adapted for reducing air resistance

Definitions

  • the invention relates to the aerodynamic design of a golf club head and specifically to the reduction of unwanted asymmetric aerodynamic forces on the driver or fairway-wood head just prior to the moment of impact.
  • the reduction of these forces allows the player to hit the ball on the center of percussion, or sweet spot, more easily, which creates longer, more accurate drives off the tee and from the fairway.
  • This invention assists all levels of golfers to improve their performance.
  • the invention does not apply to irons or putters.
  • the present invention is an improvement on prior art golf club heads, and overcomes the problems noted above by providing, at a point sufficiently far forward to cause an abrupt transition of the boundary layer and sufficiently far aft to prevent reattachment, a discontinuity in the surface to cause an aerodynamic disturbance.
  • the discontinuity, or trip strip is approximately equidistant from the club head face and is situated near the maximum thickness point.
  • the trip strip is of sufficient thickness to effect transition without a noticeable rise in drag force.
  • the invention also pertains to the retrofit of trip strip technology on existing golf club heads to bring equivalent benefits to players that do not wish to replace their existing clubs to take advantage of the performance improvement.
  • FIG. 1 is a representation of a golf driver or fairway club head with trip strip technology either built into the club head or attached to an existing club head.
  • FIG. 2 is a side view of a club head with trip strip technology.
  • FIG. 3 is a top view of a club head with trip strip technology.
  • FIG. 4 is a representation of a second embodiment of a golf club head with trip strip technology that is attached to an existing club and twisted around the hosel.
  • FIG. 5 shows a magnified representation of alternate cross-sectional shapes for trip strips.
  • FIG. 6 shows a magnified representation of alternate patterns for trip strips.
  • the golf club head 1 of the present invention is shown as the preferred embodiment in FIGS. 1 through 3.
  • a discontinuity, or trip strip 2 in the surface acts to disrupt the laminar flow over the forward part of the club head 3 .
  • the trip strip lies essentially parallel to the club face 4 near the maximum thickness of the club head cross-section 5 .
  • the airflow is uniformally disturbed around the majority of the surface perimeter and is forced to transition to a turbulent flow which does not reattach to the aft end of the club head 6 .
  • the trip strip 2 can be built into the club as a technical feature or added to existing clubs as a retrofit.
  • FIG. 4 A second embodiment of the golf club head with trip strip technology is shown in FIG. 4, where the trip strip 2 is wrapped around or attached to the hosel 7 to prevent slippage and loss.
  • FIG. 5 shows a magnification of a representation of several variations of other styles of trip strips that could produce an equivalent aerodynamic effect. Cylindrical shapes 12 , gaps 13 , grooves 14 , a step down 15 , surface curvature breaks 16 , or merely higher surface roughness like sandpaper 17 could also create the desired aerodynamic disturbance.
  • trip strip need not be continuous lines. See FIG. 6. Dashes 8 , circles 9 , triangles 10 , or dotted line trip strips 11 would serve the same purpose.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Golf Clubs (AREA)

Abstract

An aerodynamic apparatus that is built into or attached to a body of a golf club head to cause the airflow over the body to transition from smooth to turbulent at a defined length from the striking face of a club. The device reduces asymmetric variations in the boundary layer separation point that cause unsteady forces on the club head and create excess unpredictable cavitation behind the club head. The device is aligned essentially parallel to the intersection of the striking face and the body and is situated near the maximum thickness of the body cross-section. The device is comprised or a small strip of material, a string, a gap, a ridge, a groove, a step up, a step down, a surface curvature breakpoint, or a series of geometric patterns that traverses around the entire perimeter of the body surface either continuously or in broken segments.

Description

    BACKGROUND OF INVENTION
  • The invention relates to the aerodynamic design of a golf club head and specifically to the reduction of unwanted asymmetric aerodynamic forces on the driver or fairway-wood head just prior to the moment of impact. The reduction of these forces allows the player to hit the ball on the center of percussion, or sweet spot, more easily, which creates longer, more accurate drives off the tee and from the fairway. This invention assists all levels of golfers to improve their performance. The invention does not apply to irons or putters. [0001]
  • Many advances have been made in the field of driver or fairway golf club head design including material advances, trampoline effects, and drag reduction, but nothing has been invented to reduce the forward, lateral, asymmetric forces that introduce error at the moment of impact. [0002]
  • At the moment of impact a driver club head travels as high as one hundred and forty miles per hour. The average player creates head speeds of approximately eighty to one hundred miles per hour. Because the distance from the driver head to the club grip creates a long lever, very small forces on the local head translate into much larger moment forces at the players hands. These forces must be continually counteracted to guide the sweet spot of the club head to strike the ball. [0003]
  • In a normal swing the club head twists as it rotates toward the impact area and the club head traverses through a non-uniform wind velocity profile. The twisting creates a changing angle-of-attack between the golf club head and the golf club path. The non-uniform wind velocity is the result of the players' bodies, trees, buildings, spectators, tee boxes, or tee mounds, interfering with the otherwise smooth wind profile. These phenomenon cause the airflow around the face of the club head to transition from a laminar, or attached, condition, to a turbulent, or separated, condition at different lengths from the club head face around the club head. It is this aerodynamic variation that causes excess unwanted lateral forces the club head and excess non-uniform cavitation in the airflow behind the club head. [0004]
  • The prior art contains numerous attempts at reducing drag and turbulent regions behind the club head. U.S. Pat. No. 5,435,558, entitled GOLF CLUB HEAD WITH AERODYNAMIC DESIGN, tries to control the vortices behind the club but does nothing to control the separation distance from the club head face. U.S. Pat. No. 5,529,303, entitled GOLF CLUB HEAD, tries to control the airflow by channeling it through the club head, but does nothing to control the flow on the top, bottom, and side surfaces. U.S. Pat. No. 6,027,414, entitled GOLF CLUB WITH AERODYNAMIC SHAFT AND HEAD, does not address the separation distance from the club head face. These patents, others like them, and the patents cited during the prosecution thereof, do not affect the variation in boundary-layer separation distance around the club head perimeter. Further, technology from the prior art can not be retrofitted on all existing clubs like the present invention. [0005]
    • SUMMARY OF INVENTION
  • The present invention is an improvement on prior art golf club heads, and overcomes the problems noted above by providing, at a point sufficiently far forward to cause an abrupt transition of the boundary layer and sufficiently far aft to prevent reattachment, a discontinuity in the surface to cause an aerodynamic disturbance. The discontinuity, or trip strip, is approximately equidistant from the club head face and is situated near the maximum thickness point. The trip strip is of sufficient thickness to effect transition without a noticeable rise in drag force. [0006]
  • The invention also pertains to the retrofit of trip strip technology on existing golf club heads to bring equivalent benefits to players that do not wish to replace their existing clubs to take advantage of the performance improvement. [0007]
  • Other features and benefits of the present invention, like the satisfaction of golf equipment requirements of regulating bodies, will become apparent from the following description of the invention which refers to the accompanying drawings.[0008]
    • BRIEF DESCRIPTION OF DRAWINGS
  • The invention will be better understood by reference to the accompanying drawings, wherein: [0009]
  • FIG. 1 is a representation of a golf driver or fairway club head with trip strip technology either built into the club head or attached to an existing club head. [0010]
  • FIG. 2 is a side view of a club head with trip strip technology. [0011]
  • FIG. 3 is a top view of a club head with trip strip technology. [0012]
  • FIG. 4 is a representation of a second embodiment of a golf club head with trip strip technology that is attached to an existing club and twisted around the hosel. [0013]
  • FIG. 5 shows a magnified representation of alternate cross-sectional shapes for trip strips. [0014]
  • FIG. 6 shows a magnified representation of alternate patterns for trip strips.[0015]
  • These figures are provided to complete the description given here as an illustration but do not impose any limitation. [0016]
    • DETAILED DESCRIPTION
  • The golf club head [0017] 1 of the present invention is shown as the preferred embodiment in FIGS. 1 through 3. A discontinuity, or trip strip 2 in the surface acts to disrupt the laminar flow over the forward part of the club head 3. The trip strip lies essentially parallel to the club face 4 near the maximum thickness of the club head cross-section 5. The airflow is uniformally disturbed around the majority of the surface perimeter and is forced to transition to a turbulent flow which does not reattach to the aft end of the club head 6. The trip strip 2 can be built into the club as a technical feature or added to existing clubs as a retrofit.
  • A second embodiment of the golf club head with trip strip technology is shown in FIG. 4, where the [0018] trip strip 2 is wrapped around or attached to the hosel 7 to prevent slippage and loss.
  • FIG. 5 shows a magnification of a representation of several variations of other styles of trip strips that could produce an equivalent aerodynamic effect. [0019] Cylindrical shapes 12, gaps 13, grooves 14, a step down 15, surface curvature breaks 16, or merely higher surface roughness like sandpaper 17 could also create the desired aerodynamic disturbance.
  • Further, the trip strip need not be continuous lines. See FIG. 6. [0020] Dashes 8, circles 9, triangles 10, or dotted line trip strips 11 would serve the same purpose.
  • It should also be evident that the thickness and width of the trip strip cross-section could vary in size and still fall within the scope of this patent. [0021]
  • So it is evident that the golf club head with trip strip technology in the present invention has advantages as follows: [0022]
  • 1. Control of the transition point of the airflow around the club perimeter from laminar to turbulent flow. [0023]
  • 2. Reduction in lateral side forces caused by varying airflow transitions while club is undergoing changes in angle-of-attack and being subjected to non-uniform wind velocity profiles. [0024]
  • 3. Reduction in asymmetrical cavitation behind the club head during a swing due to more uniform transition to turbulent flow around club head. [0025]
  • 4. Increased ability of golfers to maintain their intended swing path and club head rotation through reduction of uncontrollable and unpredictable lateral forces. [0026]
  • 5. Increased likelihood of golfer to hit center of percussion, the sweet spot, on club head face with desired club head incidence. [0027]
  • 6. Improved golf driver accuracy and distance off the tee and off the fairway due to golfer hitting sweet spot more often with intended club head alignment. [0028]
  • 7. Applicability of trip strip technology to existing golf clubs through retrofitting clubs with an adhesive, elastic, or other disturbance. [0029]
  • While the preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications which may fall within the spirit and scope of the invention. [0030]

Claims (19)

1. A golf club head comprising a striking face for striking a golf ball, a body attaching to the striking face and extending around the perimeter of the striking face, a discontinuity in the body for controlling a boundary layer transition point on the body, and an aft surface opposite to the striking face and closing the body.
2. The golf club head of claim 1, wherein the discontinuity is essentially parallel to the intersecting edge of the striking face and the body.
3. The golf club head of claim 1, wherein the discontinuity is situated near the maximum thickness point of the cross-section of the body.
4. The golf club head of claim 1, wherein the discontinuity is located one half inch to two inches from the intersecting edge of the striking face and the body.
5. The golf club head of claim 1, wherein the discontinuity is large enough to disrupt the boundary layer but small enough not to contribute a substantial amount of drag force.
6. The golf club head of claim 1, wherein the discontinuity is comprised of an abrupt change in surface curvature, a gap, a step, a grove, or surface roughness.
7. The golf club head of claim 1, wherein the discontinuity is comprised of segments of geometric shapes, circles, triangles, dashes, or dots.
8. A golf club head comprising a striking face for striking a golf ball, a body attaching to the striking face and extending around the perimeter of the striking face, a removable discontinuity on the body for controlling a boundary layer transition point on the body, and an aft surface opposite to the striking face and closing the body.
9. The golf club head of claim 8, wherein the removable discontinuity is essentially parallel to the intersecting edge of the striking face and the body.
10. The golf club head of claim 8, wherein the removable discontinuity is situated near the maximum thickness point of the cross-section of the body.
11. The golf club head of claim 8, wherein the removable discontinuity is located one half inch to two inches from the intersecting edge of the striking face and the body.
12. The golf club head of claim 8, wherein the removable discontinuity is large enough to disrupt the boundary layer but small enough not to contribute a substantial amount of drag force.
13. A trip strip to attach to a body of a golf club head to control a boundary layer transition point on the body.
14. The trip strip of claim 13, wherein the attachment is made by adhesive, adhesive-backing, or elastic tension.
15. The trip strip of claim 13, wherein the trip strip is designed to be applied essentially parallel to a striking face of the golf club at approximately the maximum cross-section thickness of the body.
16. The trip strip of claim 13, being comprised of any number of various cross-sections designed to disrupt the boundary layer on the body.
17. The trip strip of claim 13 wherein the trip strip is large enough to disrupt the boundary layer but small enough to avoid a substantial increase of drag force.
18. The trip strip of claim 13, wherein the trip strip is formed of segments of lines, geometric shapes, circles, triangles, or dashes.
19. The trip strip of claim 13, wherein the trip strip is wrapped around a hosel of the golf club head to reduce slippage and loss.
US10/063,903 2002-05-22 2002-05-22 Apparatus for reducing unwanted asymmetric forces on a driver head during a golf swing Abandoned US20030220154A1 (en)

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Cited By (73)

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US20060014588A1 (en) * 2004-07-19 2006-01-19 Page Mark A T-blade drag reduction device for use with sporting equipment shafts
US20070293333A1 (en) * 2006-06-19 2007-12-20 Young Doo Gwon Golf club
WO2010008962A1 (en) * 2008-07-15 2010-01-21 Adams Golf Ip, Lp Golf club head having trip step feature
US20100016097A1 (en) * 2008-07-15 2010-01-21 Albertsen Jeffrey J High volume aerodynamic golf club head having a post apex attachment promoting region
US20100048316A1 (en) * 2008-01-10 2010-02-25 Justin Honea Fairway wood type golf club
WO2010051407A1 (en) * 2008-10-31 2010-05-06 Nike, Inc. Wrapping element for a golf club
US20100248860A1 (en) * 2009-03-27 2010-09-30 Michael Guerrette Advanced hybrid iron type golf club
US20100292020A1 (en) * 2009-05-13 2010-11-18 Tavares Gary G Golf club assembly and golf club with aerodynamic features
US20100311517A1 (en) * 2009-05-13 2010-12-09 Nike, Inc. Golf club assembly and golf club with aerodynamic features
US20110021284A1 (en) * 2009-07-24 2011-01-27 Nike, Inc. Golf Club Head or Other Ball Striking Device Having Impact-Influencing Body Features
US20110136584A1 (en) * 2009-05-13 2011-06-09 Nike, Inc. Golf club assembly and golf club with aerodynamic hosel
US20120142447A1 (en) * 2010-11-30 2012-06-07 Nike, Inc. Golf Club Heads or Other Ball Striking Devices Having Distributed Impact Response
US8235844B2 (en) 2010-06-01 2012-08-07 Adams Golf Ip, Lp Hollow golf club head
WO2013066429A1 (en) * 2011-10-31 2013-05-10 Karsten Manufacturing Corporation Golf club heads with turbulators and methods to manufacture golf club heads with turbulators
US20130324293A1 (en) * 2012-05-31 2013-12-05 Nike, Inc. Golf Club Head and Golf Club with Aerodynamic Features
US20130324307A1 (en) * 2012-05-31 2013-12-05 Nike, Inc. Golf club and golf club head with a crown recessed feature
KR20140035855A (en) * 2012-09-14 2014-03-24 애쿠쉬네트캄파니 Golf club head with flexure
US8758156B2 (en) 2009-05-13 2014-06-24 Nike, Inc. Golf club assembly and golf club with aerodynamic features
KR20140079741A (en) * 2012-12-19 2014-06-27 애쿠쉬네트캄파니 Golf club head with flexure
US8821309B2 (en) 2009-05-13 2014-09-02 Nike, Inc. Golf club assembly and golf club with aerodynamic features
US8821312B2 (en) 2010-06-01 2014-09-02 Taylor Made Golf Company, Inc. Golf club head having a stress reducing feature with aperture
US8827831B2 (en) 2010-06-01 2014-09-09 Taylor Made Golf Company, Inc. Golf club head having a stress reducing feature
US8834290B2 (en) 2012-09-14 2014-09-16 Acushnet Company Golf club head with flexure
US8858359B2 (en) 2008-07-15 2014-10-14 Taylor Made Golf Company, Inc. High volume aerodynamic golf club head
US8870679B2 (en) 2012-05-31 2014-10-28 Nike, Inc. Golf club assembly and golf club with aerodynamic features
US8932149B2 (en) 2012-05-31 2015-01-13 Nike, Inc. Golf club assembly and golf club with aerodynamic features
US8961332B2 (en) 2012-09-14 2015-02-24 Acushnet Company Golf club head with flexure
US8986133B2 (en) 2012-09-14 2015-03-24 Acushnet Company Golf club head with flexure
US9089749B2 (en) 2010-06-01 2015-07-28 Taylor Made Golf Company, Inc. Golf club head having a shielded stress reducing feature
US9101808B2 (en) 2011-01-27 2015-08-11 Nike, Inc. Golf club head or other ball striking device having impact-influencing body features
US20150238829A1 (en) * 2011-10-31 2015-08-27 Karsten Manufacturing Corporation Golf club heads with turbulators and methods to manufacture golf club heads with turbulators
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US9168435B1 (en) 2014-06-20 2015-10-27 Nike, Inc. Golf club head or other ball striking device having impact-influencing body features
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US9211448B2 (en) 2011-08-10 2015-12-15 Acushnet Company Golf club head with flexure
USD754271S1 (en) 2012-06-28 2016-04-19 Karsten Manufacturing Corporation Golf club head
US9320949B2 (en) 2006-10-25 2016-04-26 Acushnet Company Golf club head with flexure
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US9914026B2 (en) 2014-06-20 2018-03-13 Karsten Manufacturing Corporation Golf club head or other ball striking device having impact-influencing body features
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US10188914B2 (en) 2015-11-06 2019-01-29 Bridgestone Sports Co., Ltd. Golf club head
US10213660B1 (en) * 2017-01-13 2019-02-26 Cobra Golf Incorporated Golf club with aerodynamic features on club face
US10232232B2 (en) 2011-10-31 2019-03-19 Karsten Manufacturing Corporation Golf club heads with turbulators and methods to manufacture golf club heads with turbulators
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US10343032B2 (en) 2012-09-14 2019-07-09 Acushnet Company Golf club with flexure
US20190275386A1 (en) * 2011-10-31 2019-09-12 Karsten Manufacturing Corporation Golf club heads with turbulators and methods to manufacture golf club heads with turbulators
US10413788B2 (en) 2011-10-31 2019-09-17 Karsten Manufacturing Corporation Golf club heads with turbulators and methods to manufacture golf club heads with turbulators
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US20060014588A1 (en) * 2004-07-19 2006-01-19 Page Mark A T-blade drag reduction device for use with sporting equipment shafts
US9682290B2 (en) 2005-08-31 2017-06-20 Acushnet Company Metal wood club
US10576342B2 (en) 2005-08-31 2020-03-03 Acushnet Company Metal wood club
US20070293333A1 (en) * 2006-06-19 2007-12-20 Young Doo Gwon Golf club
US7390266B2 (en) * 2006-06-19 2008-06-24 Young Doo Gwon Golf club
US9636559B2 (en) 2006-10-25 2017-05-02 Acushnet Company Golf club head with depression
US10076694B2 (en) 2006-10-25 2018-09-18 Acushnet Company Golf club head with stiffening member
US10406414B2 (en) 2006-10-25 2019-09-10 Acushnet Company Golf club head with stiffening member
US10076689B2 (en) 2006-10-25 2018-09-18 Acushnet Company Golf club head with depression
US9498688B2 (en) 2006-10-25 2016-11-22 Acushnet Company Golf club head with stiffening member
US9320949B2 (en) 2006-10-25 2016-04-26 Acushnet Company Golf club head with flexure
US10625125B2 (en) 2008-01-10 2020-04-21 Taylor Made Golf Company, Inc. Golf club
US9168431B2 (en) 2008-01-10 2015-10-27 Taylor Made Golf Company, Inc. Fairway wood golf club head
US10058747B2 (en) 2008-01-10 2018-08-28 Taylor Made Golf Company, Inc Golf club
US20100048316A1 (en) * 2008-01-10 2010-02-25 Justin Honea Fairway wood type golf club
US9586103B2 (en) 2008-01-10 2017-03-07 Taylor Made Golf Company, Inc. Golf club head and golf club
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