Method and apparatus for active control of golf club impact

• US 20050037862A1
• Filed: 08/09/2004
• Published: 02/17/2005
• Est. Priority Date: 08/14/2003
• Status: Active Grant

• Current Assignee: Head Technology Gmbh, Ltd.
• Original Assignee: Head Technology Gmbh, Ltd.
• Inventors: Hagood, Nesbitt W., Horodezky, Jason
• Granted Patent: US 7,780,535 B2
• Time in Patent Office: Days
• US Class Current: 473/222
• CPC Class Codes: A63B 2209/14 with form or shape memory materials
• CPC Class Codes: A63B 2220/10 Positions
• CPC Class Codes: A63B 2220/30 Speed
• CPC Class Codes: A63B 2220/40 Acceleration
• CPC Class Codes: A63B 2220/53 Force of an impact, e.g. blow or punch
• CPC Class Codes: A63B 2225/50 Wireless data transmission, e.g. by radio transmitters or telemetry
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/045 Strengthening ribs
• CPC Class Codes: A63B 53/0454 Strengthening ribs on the rear surface of the impact face plate
• CPC Class Codes: A63B 53/0458 with non-uniform thickness of the impact face plate
• CPC Class Codes: A63B 53/0462 characterised by tapering thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 53/0487 for putters A63B53/065 takes precedence
• CPC Class Codes: A63B 53/08 with special arrangements for obtaining a variable impact
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like
• CPC Class Codes: A63B 60/42 Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
• CPC Class Codes: A63B 60/54 with means for damping vibrations
• CPC Class Codes: A63B 69/362 electrical or electronic
• CPC Class Codes: A63B 69/3632 : Clubs or attachments on clubs, e.g. for measuring, aligning A63B69/3614 takes precedence; clubs for swinging exercises in general A63B15/00
• CPC Class Codes: A63B 69/3685 : Putters or attachments on putters, e.g. for measuring, aligning A63B69/3614 takes precedence

Abstract

A method and apparatus for actively controlling the impact between a club head and a golf ball. A golf club head has a face with an actuator material or device mechanically coupled to influence face motion. The face actuation controls impact parameters, impact properties, or resulting ball parameters such as speed, direction and spin rates resulting from the impact event between the face of the club and the golf ball. Further, the apparatus has a control device for determining the actuation of the face. Several embodiments are presented for controlling parameters such as ball speed and direction. The invention can use energy derived from the ball impact, converted into electrical energy, and then reapplied in a controlled fashion to influence an aspect of the face, such as position, velocity, deformation, stiffness, vibration, motion, temperature, or other physical parameter.

Claims

1. A golf club head having a hitting surface for impacting a golf ball;

the head comprising;

a transducer for converting mechanical energy from said surface impacting a golf ball to an electrical energy;

a circuit for selectively steering and applying said electrical energy; and

an actuator mechanically coupled to said hitting surface and responsive to said electrical energy for affecting said hitting surface and altering golf ball impact in response to said electrical energy.

2. The golf club head recited in claim 1 wherein said transducer comprises a piezoelectric element.

3. The golf club head recited in claim 1 wherein said actuator comprises a piezoelectric element.

4. The golf club head recited in claim 1 wherein said transducer and said actuator both comprise a common piezoelectric element.

5. The golf club head recited in claim 4 wherein said piezoelectric element is affixed to said hitting surface.

6. The golf club head recited in claim 4 wherein said piezoelectric element is coupled to said hitting surface.

7. The golf club head recited in claim 4 wherein said piezoelectric element is interconnected to said hitting surface by an intermediate member.

8. The golf club head recited in claim 4 wherein said piezoelectric element is braced against said hitting surface.

9. The golf club head recited in claim 1 further comprising a structural member within said head, said structural member maintaining firm contact between said hitting surface and said actuator.

10. The golf club head recited in claim 4 further comprising a structural member within said head, said structural member maintaining firm contact between said hitting surface and said piezoelectric element.

11. The golf club head recited in claim 9 wherein said structural member comprises a conically shaped housing.

12. The golf club head recited in claim 10 wherein said structural member comprises a conically shaped housing.

13. The golf club head recited in claim 1 wherein said actuator is configured to cause said hitting surface to vibrate at a selected frequency while said golf ball is being impacted by said hitting surface.

14. The golf club head recited in claim 1 wherein said actuator is configured to cause said hitting surface to vibrate at an ultra-sonic frequency.

15. The golf club head recited in claim 1 wherein said actuator is configured to cause said hitting surface to vibrate at a frequency and with an amplitude sufficient to interrupt contact between said hitting surface and said golf ball.

16. The golf club head recited in claim 1 wherein said circuit comprises a reactive impedance for storing said electrical energy

17. The golf club head recited in claim 1 wherein said circuit comprises a reactance for storing said electrical energy.

18. The golf club head recited in claim 1 wherein said circuit comprises an inductor for storing said electrical energy.

19. The golf club head recited in claim 1 wherein said circuit comprises an inductor and a capacitor for storing said electrical energy.

20. The golf club head recited in claim 1 wherein said circuit comprises a switch for selectively applying said electrical energy in response to a threshold parameter of said hitting surface impacting said golf ball.

21. The golf club head recited in claim 20 wherein said parameter is the magnitude of an electrical voltage produced by said transducer in response to said impacting.

30. The method recited in claim 20 wherein said converting steps are each carried out using a piezoelectric element mechanically coupled to said face.

22. A golf club head having a ball impacting face for hitting a stationary golf ball, the head comprising;

a transducer for converting first mechanical energy of golf ball impact into input electrical energy and for converting output electrical energy into second mechanical energy; and

a circuit for receiving said input electrical energy and supplying said output electrical energy;

said input electrical energy being a pulse signal responsive to the first mechanical energy and said output electrical energy being an oscillating signal.

23. The golf club head recited in claim 22 wherein said second mechanical energy is a vibration having a frequency of said oscillating signal.

24. The golf club head recited in claim 22 wherein said transducer comprises a piezoelectric element.

25. The golf club head recited in claim 24 wherein said piezoelectric element is mechanically coupled to said face.

26. The golf club head recited in claim 24 further comprising a housing within said head, said housing affixed internally to said face and enclosing said piezoelectric element.

27. The golf club head recited in claim 23 wherein said vibration is applied to said face to intermittently interrupt contact between said face and said golf ball.

28. A method of reducing the effective coefficient of friction between the face of a golf club head and a golf ball;

the method comprising the step of;

converting the energy of ball impact with said face into an ultra-sonic vibration of said face to affect the interaction of said face and said ball during said impact.

29. The method recited in claim 28 wherein said converting step comprises the steps of:

converting said ball impact energy into electrical energy; and

converting said electrical energy into said ultra-sonic vibration.

31. A method of altering the interaction between a golf club head hitting surface and a golf ball being impacted by the hitting surface;

the method comprising the steps of;

coupling a piezoelectric element to said hitting surface to generate a first electrical signal in response to said hitting surface impacting said golf ball;

converting said first electrical signal into a selected second electrical signal;

selectively connecting said second electrical signal to said piezoelectric element to create a mechanical effect on said hitting surface to alter the behavior of said golf ball.

32. The method recited in claim 31 wherein said mechanical effect is a vibration of selected frequency and wherein said behavior is the induced rate of spin of said golf ball.

33. A golf club head having a hitting surface and comprising a device responsive to impact of said hitting surface with a golf ball for stiffening said hitting surface when the force of said impact exceeds a selected threshold.

34. The golf club head recited in claim 33 wherein said device comprises a sensor for sensing said force of said impact and a transducer in contact with said hitting surface and having at least two distinct levels of stiffness depending upon whether said impact force is above or below said threshold.

35. The golf club head recited in claim 34 wherein said sensor comprises a piezoelectric element.

36. The golf club head recited in claim 34 wherein said transducer comprises a piezoelectric element.

37. The golf club head recited in claim 34 wherein said sensor and said transducer each comprise a piezoelectric element.

38. The golf club head recited in claim 34 wherein said sensor and said transducer comprise a common piezoelectric element.

39. A golf club head comprising a variable stiffening element for selectively increasing and decreasing the stiffness of a hitting surface of said head.

40. The golf club head recited in claim 39 wherein said stiffening element comprises a piezoelectric element having a first level of stiffness in a short circuit configuration and a second level of stiffness in an open circuit configuration.

41. The golf club head recited in claim 40 wherein the configuration of said piezoelectric element is determined by a switch.

42. The golf club head recited in claim 41 wherein said switch is controlled by a sensor responsive to the level of impact of said golf club head with a golf ball.