Golfer&#39;s swing analysis device
This is a continuation-in-part of my patent, Ser. No. 07/611,683, filed Nov. 7, 1990, entitled: A Repeatable Golf Swing Teaching Device, now U.S. Pat. No. 5,067,717. 
    
    
     BACKGROUND 
     Golf is a sport that has existed for more than a half of century in almost its present form. It is, however, still one of the faster growing sports, possibly because of all the varied possibilities for exercise, socializing, conducting business, etc. At any rate, a great many players are willing to pay a golf pro to teach them how to improve their game. From study of many players actual in-play motion the professional trainers would agree that substantial practice is necessary to achieve a repeatable swing. Further, the pros have amply demonstrated that positioning the body, positioning the hands, shifting weight and many other interrelated factors may affect just how and where the ball travels after club impact. 
     The device of this invention is aimed at determining reproducibility of the path of the club upon backswing and downswing to impact the ball and reproducibility of body placement and weight shift. These are accomplished by determining path of movement of the club during a swing and positioning of the feet and shifting of weight during the swing using pressure sensitive pads and a light in the clubhead striking photo sensitive detectors or light sensors. Light emitted from the clubhead impacts light sensors that communicate with a computer and also directly light display lights adjacent to the sensors. When a golf student, with the aid of a pro, achieves a swing that appears right for him, the computer may be set to lock in the swing paths as a pre-chosen path. On the subsequent swings, the computer, which is an integral part of the device, may activate an alarm such as a flashing red light when the swing deviates too much from the pre-chosen paths. This real time swing comparison causes the golfer to interrupt a non-standard or not pre-chosen swing to reinforce his learning of only a standard swing. Note the pre-chosen path would be a standard swing for the individual golfer. 
     A pressure sensitive pad with multiple sensors and with indicator lights allows the golf student to lock in the computer the chosen foot location. With this unit, the computer may also indicate weight shift. The implicit assumption here is that interrupting or signaling a non-standard swing prevents reinforcing of bad swing habits. Computer analysis of the weight shift, foot placement and clubhead path allow computer &#34;instruction&#34; of the individual golfer. 
     We have examined the following patents: 
     
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U.S. Pat. No.                                                             
            Date          Inventor                                        
______________________________________                                    
4,304,406   12/8/81       J. I. Cromarty                                  
4,254,956   3/10/81       T. L. Rosnak                                    
3,601,408   8/24/71       U. K. Wright                                    
4,327,918   4/4/82        D. B. Foster                                    
4,137,566   1/30/79       S. L. Haas et al                                
4,858,934   8/22/89       R. B. Ladick et al                              
4,451,043   5/29/84       Koji Ogawa et al                                
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     All of these patents are intended to improve a players golf swing but use a different approach than our present device. 
     SUMMARY OF THE INVENTION 
     Using a first battery powered light gun attached inside the golf club with flexible fiber optic cables leading to and emitting light from the club head and a base and upright panels containing light sensors and display lights communicating with a properly programmed computer a light path formed by light emitting from the club head may be stored and recalled from a computer. When a desired swing is achieved this swing path or light path is saved and thereafter illuminated as a pre-chosen path for a particular golfer. The computer may be programmed to activate an alarm or halt light (which may simply be a flashing red light) when subsequent swings produce a light path deviating from the pre-chosen path. 
     A pressure sensitive pad with multiple sensors communicating with a computer allows the user to determine proper foot location and weight shift and lock it in the computer so that on subsequent usage the proper foot location may be indicated in some manner, such as a green light. 
     With inputs from pressure sensors and light sensors, the computer may analyze each swing subsequent to locking in prechosen swing and proper foot location. For example speed of backswing and relative time of shifting of weight could be indicated as a print-out even if each swing were within allowable limit of pre-chosen swing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows a three dimensional view of the equipment and location of student golfer during equipment use. 
     FIG. 2 shows more detail of the golfer instruction panel. 
     FIG. 3 indicates placement of a switch, battery, light and light conducting fibers inside a golf club in a first embodiment. 
     FIG. 4 indicates placement of a switch, battery, light, and light conducting cables to allow retrofitting existing golf clubs. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The preferred embodiment of this invention may best be described from the drawings. Consider first FIG. 1, base panel 1 is hinged at one end to side panel 2 which is hinged on one side to back panel 3. Back panel 3 could be a single panel but a two segment hinged panel is preferred. With proper sizing, these panels may be folded together for easy transportation. 
     In use golfer 7 stands on pressure sensitive pad 5. Multiple sensors in this pad communicate through a wiring channel 24, which is on the back of each panel, to computer 25. Then a desired foot placement is determined and this location is set in the computer 25 and the computer activates a green light 16, FIG. 2 on instruction panel 15. For later analysis, the weight pattern for each foot is saved in the computer and the program is such that weight shift timing may be compared to timing and light path during the swing to indicate proper club head location for the weight shift to occur. This may lead to computer print-out such as &#34;Weight Shift is O.K.&#34; 
     In use as golfer 7 moves club head 8 the light path from light gun 33, FIG. 3, indicating club head movement will contact sensors 10 and red lights 14 and/or green lights 12 shown in detail in front of club head 8 and extending along paths indicated by lines in the drawing will light up according to program in computer 25. Normally after the standard a pre-chosen path is locked in the computer green lights 12 are activated to show proper path and red lights 14 come on with an out-of-standard path swing. An audible alarm 23 included in instruction panel 15 may also be used. 
     FIG. 2 shows golfer instruction panel 15 in more detail. Green light 16 indicates proper foot placement. Light 18 changes from green to red if backswing speed is out of standard and similarly light 20 changes from green to red if downswing speed is out of standard while halt light 21 flashes red if backswing path is out of standard or pre-chosen path. Downswing halt light 22 also flashes red when out of standard or out of a pre-chosen path occurs. Standard or pre-chosen paths are determined as &#34;correct&#34; for each individual golfer, usually with the aid of an instructor. Pre-chosen or standard 7 are locked in the computer and allowable variations are built in the computer golf training program. Read out 19 prints out brief analysis on command after each swing. Analysis relates weight shift and swing light path and swing speed. 
     In FIG. 3 we show a first embodiment with a manually operable switch 31, a battery 30, and a light gun 33 held in place inside a golf club with light conducting means leading from the light gun to emit light from the bottom face of the club head 8. The light may be a laser light or normal incandescent light. Similarly, wires from a battery to a light emitting diode would be within the scope of this invention. 
     In FIG. 4 we show a second embodiment wherein manual switch 31, battery 30, light gun 33, and fiber optic cable 32 are external to the club 29. This embodiment would be useable for retrofitting existing golf clubs. 
     Legend 
     FIG. 1 
     1=base panel 
     2=side panel 
     3=back panel 
     5=pressure sensitive panel pad with multiple sensors 
     7=golfer 
     8=ball on tee 
     10=light sensors 
     12=red display lights 
     14=green display lights 
     15=golfer instruction panel 
     24=wiring channel 
     25=computer 
     FIG. 2 
     15=golfer instruction panel 
     16=foot placement 
     8=backswing speed 
     19=readout 
     20=downswing speed 
     21=backswing path halt light 
     22=downswing path halt light 
     23=audible alarm 
     FIG. 3 
     8=club head 
     29=golf club 
     30=battery in golf club 
     31=light switch 
     32=fiber optic cable 
     33=light 
     FIG. 4 
     8=club head 
     29=golf club 
     30=battery in golf club 
     31=light switch 
     32=fiber optic cable 
     33=light