Golf swing training club
a swing training and swing technology, applied in the field of golf swing training clubs, can solve the problems of many users not improving their swing motion,
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example 1
[0073]Measurement Procedure: Extensive Shear Modulus
[0074]Shear modulus as an extensive property for golf clubs can be characterized by a shaft torque analyzer, e.g., an apparatus that measures the angular deflection of the shaft under standard and repeatable conditions. Commercially available apparatus for this purpose include the Auditor® 050312 digital shaft torque measuring machine.
[0075]Such shaft torque measuring machines are typically equipped with a torsion control head having a cradle adapted to receive a golf shaft. The torsion control head has a torsion arm, and may be adapted to receive a torsion weight at a predetermined position along the arm, so as to exert a predetermined load. In the measurement procedure used herein, the predetermined load is 1 pound / foot. When properly inserted, the shaft should protrude past the back (inwardly disposed) side of the torsion control head clamp by 1.5 inches.
[0076]The shaft torque measuring machine includes a shaft butt clamp, which...
example 2
[0080]Measurement: Extensive Shear Modulus
[0081]The standard extensive shear modulus (expressed as angular deflection, in degrees) for various training golf clubs of the present invention was found to be at most 15°. More typically, the angular deflection was at most 12°, or at most 10°, at most 8°, or at most 6°. The angular deflection was at least 2°. The angular deflection was typically within a range of 2° to 15°, 2° to 12°, 2° to 10°, 2° to 8°, 3° to 15, 2°, 3° to 12°, 3° to 10°, 3° to 8°, 4° to 12°, 4° to 10°, 4° to 8°, 5° to 12°, or 5° to 10°.
[0082]Utilizing thicker wires for the braiding, utilizing stiffer materials of construction, and utilizing more than one layer of braiding all contribute to a reduction in the angular deflection.
example 3
[0083]Measurement Procedure: Extensive Bending
[0084]Extensive longitudinal (i.e., along the length of the shaft axis) bending of the shaft may be characterized by the angle the shaft makes when held horizontally, using a putting head of standard weight—350 grams.
[0085]The shaft is held or supported solely on the handgrip side, such that the length of the free beam between the hold position and the putting head is 20 inches. The downward bend or vertical dip (“DIP LENGTH”, or Ldip) from horizontal is measured, in inches, as is the resultant horizontal extension (“HORIZONTAL LENGTH”, or Lhor). The standard shaft bending angle (in degrees) may be calculated by the following formula:
standard longitudinal shaft bending angle (β)=tan−1 (Ldip / Lhor)
[0086]Thus, for an idealized, non-bending shaft, Ldip=0 and Lhor=20, such that the standard longitudinal shaft bending angle (β)=0°. For an idealized, fully-bending shaft, Ldip=20 and Lhor=0, such that the standard longitudinal shaft bending angl...
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