US3918721A - Golf club swing training device and method - Google Patents

Golf club swing training device and method Download PDF

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Publication number
US3918721A
US3918721A US426435A US42643573A US3918721A US 3918721 A US3918721 A US 3918721A US 426435 A US426435 A US 426435A US 42643573 A US42643573 A US 42643573A US 3918721 A US3918721 A US 3918721A
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United States
Prior art keywords
feeler
club
forearm
user
contact
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US426435A
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English (en)
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Jr John B Trask
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TRASK JOHN B JR
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Individual
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Publication date
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Priority to US426435A priority Critical patent/US3918721A/en
Priority to JP49112664A priority patent/JPS5095041A/ja
Application granted granted Critical
Publication of US3918721A publication Critical patent/US3918721A/en
Priority to JP1979016781U priority patent/JPS54132372U/ja
Assigned to GRIMM, JOHN reassignment GRIMM, JOHN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TRASK, JOHN B. JR.
Assigned to TRASK, JOHN, B. JR., reassignment TRASK, JOHN, B. JR., ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GRIMM, JOHN
Assigned to ROSEWOODS INTERNATIONAL, INC., D/B/U SCIENTIFIC TECHNOLOGIES, , , ., , . reassignment ROSEWOODS INTERNATIONAL, INC., D/B/U SCIENTIFIC TECHNOLOGIES, , , ., , . LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: TRASK, JOHN, JR.
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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
    • A63B69/00—Training appliances or apparatus for special sports
    • A63B69/36—Training appliances or apparatus for special sports for golf
    • A63B69/3623—Training appliances or apparatus for special sports for golf for driving
    • A63B69/3632—Clubs or attachments on clubs, e.g. for measuring, aligning

Definitions

  • ABSTRACT A flexible. shapeable extension or feeler attachable to extend from the end of the handle of a golf or other club used to strike a ball or like projectile is positionable to cause it to barely miss contact with the left forearm of a user in addressing the ball.
  • the long feeler can contact the arm if the wrists are broken excessively.
  • the end of the feeler will contact the arm only if hands are not properly ahead of the club and such contact tells the user he has swung improperly.
  • the feeler will contact the arm only if there is not proper wrist pronation and again the contact will advise the user.
  • Electrical sensory signal members may be incorporated.
  • the device is also useful in similar fashion with clubs, bats. or rackets other than golf clubs.
  • a specific object is to provide a device of this kind which embodies a flexible, positionable extension that can be attached to a golf club to lie alongside the players forearm and to produce contact with the forearm of the wearer only when the wrists are improperly broken on a backswing.
  • a similar object is to provide such a device which produces contact only when the arms have an improper relationship to the club at point of impact with the ball. Another object is to provide such a device that provides contact unless there is a proper pronation of the wrists of the player on followthrough.
  • Another object is to provide such a device which can be readily attached to a club and readily adjusted on the club. Also it is not excessively large or heavy and can be counter-balanced. Another object is to provide such a device that can be incorporated with an electrical means carried by the user to produce a sensory signal, either audible or visual or both, when an improper swing is made.
  • a device of this kind particularly usable in connection with the golf club which produces contact with the forearm of the wearer in the event of an improper swing, thereby signalling the condition, and which device does not contact the forearm of the user when the swing is proper.
  • FIG. 1 is an elevation partly in section of the device clamped on the handle of a golf club
  • FIG. 2 is a section on the line 2-2 of FIG. 1 showing a modification of the clamping means
  • FIGS. 3 through 9 are stick diagrams of the body and arm positions of golf swings, the present device being indicated by dashed lines, specifically;
  • FIG. 3 is a diagram of the way the present invention acts on a proper backswing
  • FIG. 4 is a view similarly showing the condition with an improper backswing having excessive wrist break;
  • FIG. 5 is a view showing the position of the device with a proper point of impact relationship
  • FIG. 6 is a diagram of the situation with an improper point of impact position
  • FIG. 7 shows the condition of the device with proper pronation of the wrists on a follow-through
  • FIG. 8 shows the contact condition with absence of pronation
  • FIG. 9 shows the aligning position a player may take in addressing the ball for correct position of the feeler
  • FIG. 10 is a sketch of the device showing the left arm properly positioned at the upper part of a backswing
  • FIG. 11 is a sketch of the left arm properly positioned at the approximate point of contact, the electrical signal device being attached to his arm;
  • FIG. 12 is a view of the left forearm at follow-through with proper pronation
  • FIGS. 13 and 14 are views showing the effect ofproperly held wrists in the backswing (FIG. 13) and backwardly rolled wrists (FIG. 14);
  • FIGS. 15 and 16 are views of proper wrist and finger grip during backswing (FIG. 15) and the effect of broken wrists (FIG. 16);
  • FIG. 17 is a view of a wrist wrap for an electrical signalling device.
  • FIG. 18 is a wiring diagram of such an electrical device.
  • the device comprises a flexible feeler 20, attachable to the handle of a golf club 21.
  • An appropriate adjustable band 22 is used to attach this device releasably to the club 21.
  • this is shown as being a strap of the hose clamp type with a worm wheel adjustment device 23 having a wing-nut 24 by which it may be turned, the worm wheel engaging in the slots 25 to loosen or tighten the strap 22, in the known manner.
  • the feeler 20 may be attached directly to the strap as by a ferrule 28 secured directly to the strap and to the end of the feeler.
  • the feeler 20 is embraced between the jaws ofa clamp 30 that can be tightened by a screw 31 and a wing nut 32, the screw 31 being attached to the strap 22.
  • the feeler may be permanently attached, as by solder or welding, to the clamp.
  • the advantage of this arrangement is that the clamp 30 is swivelled on the screw 31 so that when the wing nut 32 is loosened, the feeler may be swung about the axis of the screw 31 and then secured in adjusted position by tightening the wing nut 32. This is particularly useful where ,the feeler 20 is rigid and not bendable.
  • the feeler 20 is made up of metal spiral that is wrapped in a loose coil around an inner reinforcing wire. It can be readily shaped to extend in a desired direction or combination of directions but will stay in its adjusted shape with resistance against unintended distortion therefrom. Preferably it has an end tip 34 on it.
  • feeler 20 has been described in its preferred form of being flexible, it may be made rigid for certain types of use or where it is to be used by one person.
  • the feeler device may be used in connection with an electrical signalling means.
  • an electrical signalling means there is a strap 40 that can be wrapped around the wrist of the user.
  • the ends of the strap may have Velcro fasteners 41 so that the strap can be securely attached around the forearm of any user, with adjustable snugness.
  • the strap is of nonconductive fiber material. It has on its surface a conducting sheet 43 which is to be on the outside of the wrist when this device is used.
  • the conductive sheet 43 has a very flexible wire 44 leading from it to a base 45.
  • This base or pad 45 can have signal devices and a small dry cell battery mounted on it.
  • a buzzer 46 and a light 47 have been illustrated as connected in parallel to one end of a battery 50.
  • the other end of the battery is connected by a light wire 51 to the end of the feeler 20 which is of conductive metal.
  • Hooks 52 are attached to the pad 45 to enable the assembly to be hung onto the belt or waist band of the user.
  • the feeler device is initially assembled on the club by applying the strap 22 around the club and tightening the wing nut 24 until the strap is secure.
  • the feeler 20 is extended generally coaxially with the club and the wing nut 32 tightened.
  • the angle between the feeler and the club may be adjusted in the embodiment of FIG. 2. If the feeler is rigidly secured to the strap, this last adjustment is made unnecessary, and the positioning of the feeler extension must be made by shaping the feeler 20.
  • the swivel clamp is especially important with an inflexible feeler 20.
  • the user then grips the club with his left hand (assuming he is a right-handed golfer). He closes his right eye and looks along the left forearm and golf shaft, as diagrammatically illustrated in FIG. 9.
  • the left forearm should be approximately in line with the golf club shaft. In this position (See FIG. the hands are ahead of the club head.
  • the player with his right hand bends the flexible tubing so that it comes around his left wrist and forearm approximately to the position indicated in FIG. 10. It should be just out of contact with his forearm.
  • the attachment point of the feeler to the strap is about at the bottom side of the club, from which point the feeler extends up the arm, then bends around the outside of the arm, to bring its outer or free end portion adjacent the outer forearm of the wearer.
  • the feeler is formed of rigid tubing or rod, the positioning is produced by a combination of turning the whole strap 22 about the axis of the golf club and by turning the clamp 30 about the axis of the screw 31 as heretofore explained.
  • the feeler may be relatively shorter or longer. In the event of the shorter feeler 20, it simply comes up to contact with the outer part of the forearm a bit above the wristwatch position, If a longer type feeler is used as is suggested in FIGS. 3 and 4, the feeler may cross over the forearm just out of contact with the forearm and hook in beyond the inner side of the forearm. It should be out of contact with the arm at all points. The feeler positioned this way retains its position and shape, since the tubing is relatively stiff, when shaped, or is actually rigid.
  • FIGS. 3 and 4 diagrammatically representing a user facing the reader, the conditions of the backswing near the top, where the wrists are normal (FIG. 3) and are brokenexcessively (FIG. 4) are illustrated.
  • the backswing in these illustrations is not made as high as a normal backswing.
  • FIG. 3 where the extended feeler 20 is shown in dashed lines, with proper wrist position, ab sent excessive wrist break, the feeler is clear of the left forearm. However, if the wrists are excessively broken as shown in FIG. 4, the free end of the feeler 20 is,
  • FIG. 5 shows the proper swing at point of impact
  • FIGS. 7 and 8 the use of the feeler to indicate whether proper pronation of the wrist has been made is illustrated.
  • This twisting, or pronation, of the wrists requires the right wrist to be twisted over theleftplt' should begin approximately at the time of, or slightly.
  • FIG. 7 the wrists have been pronated and as is evident, this has twisted the feeler 20 around so that there is a substantial distance between it and the left forearm of the player.
  • FIG. 8 where there has been no pronation of the wrists, the feeler 20 is again in pres- I sure contact with the forearm of the player, warning him that'he has failed to perform the pronation.
  • FIG. 11 shows a view facing a players left hand when proper pronation has been effected. I
  • the feeler may be set for sensing improper wrist action at maximum backswing. In such case it is curved somewhat around the left wrist, as shown in FIGS. 13
  • the swing will not be significantly disturbed by such contact, as the feeler will yield readily enough to avoid interference.
  • it is somewhat resilient, so as to return to a preset position and shape, and resistingly pliable so that it can be shaped by hand and yet will retain that shape or return to it upon mild deformation as by the contact mentioned.
  • the device can be used with an electrical means to produce a sensory signal, audible or visual or both.
  • the pad 45 with the signal de vices and small battery is hooked over the waist of the wearer. out of the way of his arms.
  • the fine andflexible wires 44 and 51 are connected to the conductive sheet 43 and to the feeler 20, respectively. Preferably, these wires are led to the shoulder of the user and down his arm.
  • the flexible conductor sheet 43 is large enough to be contacted by the feeler (which is formed of or with an electrical conductor) in each of the positions of error, in FIGS. 4, 6 and 8. The user will be signalled at what point the mistake was made.
  • this device can aid in correcting the main causes of improper swinging.
  • one of the worst tendencies is to bring the club head to strike the ball before the hands are past the imaginary vertical plane dissecting the ball. Since the downswing and follow-through occur in so short a period of time, it is difficult for the golfer to determine when and whether his hands or the golf club head have first passed the critical plane. Yet with the present device, he is given a sensory warning in the event his swing is improper in this respect. The same may be said for the other two swing errors, namely, overbreaking of the wrists at the backswing, and failure to pronate the wrists at the time of impact and follow-through.
  • this invention provides a device which is light in weight and not cumbersome so that it can be easily attached to the golf club or other sporting device.
  • the manufacturer can provide a selection of clubs with their swing weights and total weights adjusted so that this device is compensated for when it is attached. A golfer can swing these clubs and easily determine which club produces the best results for him.
  • the device can be used by any person, male or female, lefthanded or right handed, since it is adjustable to any size. It ispreferred to have it removable from the club so that the club can be used without it when the player has corrected his swing, but a club can be made with the feeler permanently attached to and extending from its handle.
  • the player can practice swings very slowly because the device itself will indicate whether his swing is proper. In fact, this can be done whether or not he is on a golf course and whether or not he has a golf ball.
  • sensate signal producing means including an elongated feeler and means for attaching it to the club handle adjacent the hand grip, so that it can extend adjacent the arm of the user; the feeler being connected onto the attaching means, and the device having a shape and length to extend the feeler from the attaching means at the back side of the forearm of the user to lie adjacent the front side of the forearm of the user and to be in close relation but out of contact thereto when the users wrists are held at a proper angle with respect to the club for a given position of swinging the club, the device providing a structure sufficiently rigid that it can maintain such predetermined shape during the swinging of the club in a normal swing, and so that if the user's wrists become positioned at an improper angle with respect to the club, the forearm will contact the feeler and produce a sensate signal.
  • the free end of the feeler away from the attaching means being bent forwardly from the attaching means and then across the forearm whereby the free end portion may be contacted by the forearm upon the aforesaid improper club swinging movement.
  • the feeler device of claim 2 being bent for extending across the front of the forearm and then backward at its free end portion so that it may hook onto the inside of the forearm, the free end portion being bent to a position wherein it can contact the inside of the users forearm as upon excessive wrist break on a backswing.
  • the feeler being flexible to enable it to be shaped by intentional bending, but relatively firm when shaped so that it will retain the shape to which it is bent unless directly inpinged upon.
  • the feeler comprising a helically coiled sheath surrounding a wire core.
  • the means to secure the feeler to the club being a removable clip having releasable means for attachment or removal of the device.
  • the removable clip comprising a band engageable around a club handle and the releasable means comprising a device to shorten or lengthen the band.
  • the means to secure the feeler to the club comprising a releasable clamp swivelly attachable to the club, and means to secure it in a desired swivelled position, the feeler being attached to and extending from the clamp so as to be pivotally positionable on the club.
  • an electrical conductor means for mounting on the forearm of the user, having an exposed conductor; means comprising a batteryoperated sensing signal, for connecting the signal to a battery, and to the exposed conductor and to the feeler, the feeler being electrically conductive, so that the sensory signal may be operated when the conductor is mounted on the forearm at the point where the feelers contacts on an improper swing.
  • the conductor means comprising a band and securing means for attaching it around the forearm, and the conductor comprising a conductive sheet of material securedto the band.
  • a method to improve a swing of an athletic club such as a golf club at a ball or like projectile comprising: providing a feeler extending outwardly beyond the end of the club, to lie adjacent the forearm of the user,

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
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US426435A 1973-12-19 1973-12-19 Golf club swing training device and method Expired - Lifetime US3918721A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US426435A US3918721A (en) 1973-12-19 1973-12-19 Golf club swing training device and method
JP49112664A JPS5095041A (enrdf_load_stackoverflow) 1973-12-19 1974-09-30
JP1979016781U JPS54132372U (enrdf_load_stackoverflow) 1973-12-19 1979-02-14

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US426435A US3918721A (en) 1973-12-19 1973-12-19 Golf club swing training device and method

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US3918721A true US3918721A (en) 1975-11-11

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023812A (en) * 1976-03-15 1977-05-17 Lorang Walter R Golf swing wrist action training apparatus
US4145054A (en) * 1977-06-17 1979-03-20 Stewart Phil D Golf swing training aid
US4595204A (en) * 1985-07-02 1986-06-17 Patterson George H Device for practicing golf club swing
WO1988003042A1 (en) * 1986-10-27 1988-05-05 Robert William Cox Golf club guide means
GB2218915A (en) * 1986-10-27 1989-11-29 Kenmore Squash Centre Golf club guide means
US5108103A (en) * 1991-03-20 1992-04-28 Golf Research Technology, Inc. Wrist release trainer
US5125657A (en) * 1991-05-06 1992-06-30 Richard D. Beil Putter with pendulum action
US5149085A (en) * 1992-01-22 1992-09-22 William Sanchez Training aid for shooting a basketball
US5184826A (en) * 1992-05-07 1993-02-09 Hall Jr Carroll L Golf swing training device
US5226650A (en) * 1989-09-05 1993-07-13 Wolfgang Suttner Tennis racket
US5308072A (en) * 1993-04-12 1994-05-03 Pettinelli Anthony J Golf club counterweight apparatus
USD347673S (en) 1992-05-18 1994-06-07 Wally Armstrong Golf, Inc. Golf swing aid
US5324038A (en) * 1991-07-10 1994-06-28 Thurman Sasser Golfer's monitoring system
US5607361A (en) * 1994-11-18 1997-03-04 Back Swing Management, Inc. Electronic device for signaling wrist position during a golfer's swing
US5772523A (en) * 1997-04-03 1998-06-30 Sheftic; Ted Golf training device
US5803840A (en) * 1995-08-08 1998-09-08 Young; Gary Sound producing baseball bat
US5846143A (en) * 1995-01-31 1998-12-08 Golf Inventions Pty Ltd. Golfing aid
WO2004020053A1 (en) * 2002-08-28 2004-03-11 Roger John Brooks Golf putting training device
US6719639B2 (en) 2001-06-13 2004-04-13 John Michael Novosel, Sr. Golf wrist trainer
WO2004067114A1 (en) 2003-02-01 2004-08-12 Jeffrey Robert Hall Golf training aid
US20060073920A1 (en) * 2004-10-05 2006-04-06 Martin Kunsman Tennis training apparatus and method of use thereof
US7462116B2 (en) 2004-10-05 2008-12-09 Martin Kunsman Tennis training apparatus and method of use thereof
US8128507B1 (en) 2011-01-05 2012-03-06 Martin Chuck Training tool for maintaining proper hand position through a golf swing and method of use
US9573040B1 (en) * 2016-05-02 2017-02-21 Michael Metz Short game golf swing training aid
US20170080313A1 (en) * 2015-09-23 2017-03-23 Davinci Corporate Holdings, Llc Biomechanical movement training device
USD782589S1 (en) * 2015-05-04 2017-03-28 Joshua Burdick Gripping device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6343573U (enrdf_load_stackoverflow) * 1986-09-09 1988-03-23

Citations (10)

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US932988A (en) * 1909-04-29 1909-08-31 John Ernst Lind Larson Oscillating toy.
US1446835A (en) * 1921-07-20 1923-02-27 Cook William Jardine Vibrating toy
US1727700A (en) * 1928-12-14 1929-09-10 Anna P Dickson Artificial butterfly
US2204974A (en) * 1938-09-26 1940-06-18 Strasser Robert Golf club
US2482630A (en) * 1947-08-07 1949-09-20 Mastromarino Vincent Automobile curb guide
US3101209A (en) * 1959-09-30 1963-08-20 Wiremold Co Collapsible tubing with integral clamp
US3443811A (en) * 1966-04-14 1969-05-13 Ernest J Brooks Practice device for golfers
US3494058A (en) * 1968-06-17 1970-02-10 Bjorksten Research Lab Inc Firefly simulator
US3698720A (en) * 1971-01-20 1972-10-17 Austin Gudmundsen Golf ball retriever
US3729199A (en) * 1970-12-23 1973-04-24 E Granberg Sighting device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB916700A (en) * 1960-11-23 1963-01-23 Ian Campbell An improved device for the use of golfers
JPS5032061B2 (enrdf_load_stackoverflow) * 1971-10-02 1975-10-17
JPS529545B2 (enrdf_load_stackoverflow) * 1973-07-25 1977-03-16

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US932988A (en) * 1909-04-29 1909-08-31 John Ernst Lind Larson Oscillating toy.
US1446835A (en) * 1921-07-20 1923-02-27 Cook William Jardine Vibrating toy
US1727700A (en) * 1928-12-14 1929-09-10 Anna P Dickson Artificial butterfly
US2204974A (en) * 1938-09-26 1940-06-18 Strasser Robert Golf club
US2482630A (en) * 1947-08-07 1949-09-20 Mastromarino Vincent Automobile curb guide
US3101209A (en) * 1959-09-30 1963-08-20 Wiremold Co Collapsible tubing with integral clamp
US3443811A (en) * 1966-04-14 1969-05-13 Ernest J Brooks Practice device for golfers
US3494058A (en) * 1968-06-17 1970-02-10 Bjorksten Research Lab Inc Firefly simulator
US3729199A (en) * 1970-12-23 1973-04-24 E Granberg Sighting device
US3698720A (en) * 1971-01-20 1972-10-17 Austin Gudmundsen Golf ball retriever

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023812A (en) * 1976-03-15 1977-05-17 Lorang Walter R Golf swing wrist action training apparatus
US4145054A (en) * 1977-06-17 1979-03-20 Stewart Phil D Golf swing training aid
US4595204A (en) * 1985-07-02 1986-06-17 Patterson George H Device for practicing golf club swing
WO1988003042A1 (en) * 1986-10-27 1988-05-05 Robert William Cox Golf club guide means
GB2218915A (en) * 1986-10-27 1989-11-29 Kenmore Squash Centre Golf club guide means
GB2218915B (en) * 1986-10-27 1990-09-19 Kenmore Squash Centre Golf club guide means
US5009426A (en) * 1986-10-27 1991-04-23 Cox Robert W Golf club guide means
US5226650A (en) * 1989-09-05 1993-07-13 Wolfgang Suttner Tennis racket
US5108103A (en) * 1991-03-20 1992-04-28 Golf Research Technology, Inc. Wrist release trainer
US5125657A (en) * 1991-05-06 1992-06-30 Richard D. Beil Putter with pendulum action
US5324038A (en) * 1991-07-10 1994-06-28 Thurman Sasser Golfer's monitoring system
US5149085A (en) * 1992-01-22 1992-09-22 William Sanchez Training aid for shooting a basketball
US5184826A (en) * 1992-05-07 1993-02-09 Hall Jr Carroll L Golf swing training device
USD347673S (en) 1992-05-18 1994-06-07 Wally Armstrong Golf, Inc. Golf swing aid
US5308072A (en) * 1993-04-12 1994-05-03 Pettinelli Anthony J Golf club counterweight apparatus
US5607361A (en) * 1994-11-18 1997-03-04 Back Swing Management, Inc. Electronic device for signaling wrist position during a golfer's swing
US6251025B1 (en) 1995-01-31 2001-06-26 Golf Inventions Pty Ltd Golfing aid
US5846143A (en) * 1995-01-31 1998-12-08 Golf Inventions Pty Ltd. Golfing aid
US5803840A (en) * 1995-08-08 1998-09-08 Young; Gary Sound producing baseball bat
US5772523A (en) * 1997-04-03 1998-06-30 Sheftic; Ted Golf training device
US6719639B2 (en) 2001-06-13 2004-04-13 John Michael Novosel, Sr. Golf wrist trainer
US7244187B2 (en) * 2002-08-28 2007-07-17 Roger John Brooks golf putting training device
US20060035716A1 (en) * 2002-08-28 2006-02-16 Brooks Roger J Golf putting training device
WO2004020053A1 (en) * 2002-08-28 2004-03-11 Roger John Brooks Golf putting training device
WO2004067114A1 (en) 2003-02-01 2004-08-12 Jeffrey Robert Hall Golf training aid
US7419444B2 (en) 2004-10-05 2008-09-02 Martin Kunsman Tennis training apparatus and method of use thereof
US20060073920A1 (en) * 2004-10-05 2006-04-06 Martin Kunsman Tennis training apparatus and method of use thereof
US7462116B2 (en) 2004-10-05 2008-12-09 Martin Kunsman Tennis training apparatus and method of use thereof
US8128507B1 (en) 2011-01-05 2012-03-06 Martin Chuck Training tool for maintaining proper hand position through a golf swing and method of use
USD782589S1 (en) * 2015-05-04 2017-03-28 Joshua Burdick Gripping device
US20170080313A1 (en) * 2015-09-23 2017-03-23 Davinci Corporate Holdings, Llc Biomechanical movement training device
US20170084194A1 (en) * 2015-09-23 2017-03-23 Davinci Corporate Holdings, Llc Methods for biomechanical movement training
US9573040B1 (en) * 2016-05-02 2017-02-21 Michael Metz Short game golf swing training aid

Also Published As

Publication number Publication date
JPS5095041A (enrdf_load_stackoverflow) 1975-07-29
JPS54132372U (enrdf_load_stackoverflow) 1979-09-13

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Owner name: GRIMM, JOHN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRASK, JOHN B. JR.;REEL/FRAME:004560/0643

Effective date: 19860509

AS Assignment

Owner name: TRASK, JOHN, B. JR.,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GRIMM, JOHN;REEL/FRAME:004691/0260

Effective date: 19870403

AS Assignment

Owner name: ROSEWOODS INTERNATIONAL, INC., D/B/U SCIENTIFIC TE

Free format text: LICENSE;ASSIGNOR:TRASK, JOHN, JR.;REEL/FRAME:004691/0564

Effective date: 19870406