Bat selector

• US 5,118,102 A
• Filed: 04/19/1989
• Issued: 06/02/1992
• Est. Priority Date: 04/19/1989
• Status: Expired due to Term

• Current Assignee: Andrew T. Bahill, William J. Karnavas
• Original Assignee: Andrew T. Bahill, William J. Karnavas
• Inventors: Karnavas, William J., Bahill, Andrew T.
• Primary Examiner(s): Brown, Theatrice
• Application Number:
  US07/340,486
• Time in Patent Office: 1,140 Days
• Field of Search: 273/26 B, 273/26 R, 273/29 A, 273/186 R, 273/194 R, 273/191 R, 273/191 A, 273/77 A, 273/181 H, 273/67 R, 273/72 R, 273/32 H, 73/13
• US Class Current: 473/564
• CPC Class Codes: A63B 69/0002 for baseball
• CPC Class Codes: G01P 3/00 Measuring linear or angular speed; Measuring differences of linear or angular speeds G01P5/00 - G01P11/00 take precedence; direction and speed indication G01P13/045; counting mechanisms G06M

Abstract

An instrument combining physical and physiological measurements of a person'"'"'s swing of a bat determines the optimum bat weight to provide maximum efficient ball speed after contact. Also a process uses the instrument to obtain data on bat speed, plots a best fit curve to the bat speed data, determines and plots the ball speed after contact and selects the optimum bat weight.

Claims

1. A bat selector comprising, means to obtain data for bat speed before bat collision with a ball for the swing of each bat of a set of diversely weighted bats;

means to plot a point of each corresponding bat weight versus said bat speed data;

means to fit a best fit curve to the plot of points of bat weight versus said bat speed data;

means to use said best fit curve to obtain a mathematical equation for said speed before its collision with a ball;

means to use said before its collision with a ball to obtain a mathematical equation for a batted ball speed after its collision with a bat; and

means to plot a curve of said batted ball speed after collision versus bat weight.

2. The bat selector of claim 1 further comprising, means to select a range of bat weights at predetermined locations on a curve of bat weight versus said ball speed after collision.

3. The bat selector of claim 1 further comprising, means to select an optimum bat weight for maximum ball speed after said collision.

5. The bat selection process of claim 1, in which an optimum bat weight is selected from said range of bat weights.

4. A bat selector process comprising, using an instrument having at least two vertical light beams, said beams being separated by a predetermined distance and each having a associated light detector and a computer;

to record a time between interruption of said light beams by each of a plurality of bats swung by a batter, said bats having predetermined weight;

to calculate the bat speed of the bat before collision with a ball, said bat speed being said predetermined distance divided by the time recorded between said interruptions of said light beams;

to plot points of said bat speed versus bat weight data for a plurality of swings of each of a plurality of predetermined bat weights, said bat speed for each bat weight beige defined by V2b=Am+B, the bat speed before the collision of the bat with a ball equals A times the bat mass plus B, wherein A is a constant and B is a constant V2b is the bat speed;

to apply a best fit curve to said bat speed before said collision versus bat weight data points; and

to use said best fit curve in a combined Momentum and Restitution equation ##EQU6## to an equation for ball speed after said collision.