The bat's form has become more refined over time. In the mid-19th century, baseball batters were known to shape or
whittle their own bats by hand, which resulted in a wide range of shapes, sizes, and weights. For example, there were flat bats, round bats, short bats, and fat bats. Earlier bats were known to be much heavier and larger than modern regulated ones. During the 19th century, many experimental shapes and handle designs were tried. Modern bats are much more uniform in design.
Innovations • On June 17, 1890, Emile Kinst received the ball-bat, or banana bat. The bat is shaped with a curve, hence the name banana bat. The creator of the bat, Kinst wrote: "The object of my invention is to provide a ball-bat which shall produce a rotary or spinning motion of the ball in its flight to a higher degree than is possible with any present known form of ball-bat, and thus to make it more difficult to catch the ball, or if caught, to hold it, and thus further to modify the conditions of the game". • The mushroom bat, made in 1906 by
Spalding. With baseball bats being larger in the 1900s the Spalding company designed a larger bat with a mushroom-shaped knob on the handle. This enabled the batter to get a better distribution of weight over the entire length of the bat. • The Wright & Ditson Lajoie baseball bat. This bat had a normal size barrel but had two knobs on the handle. The lower knob was at the bottom of the handle and the other knob, also called the shoulder, was three inches above the lower knob. This was designed to have better spacing between the hands due to the shoulder being in the middle of the grip. This also gave batters an advantage when they choked up on the bat, because the second knob provided a better grip. • In 1990, Bruce Leinert came up with the idea of putting an
axe handle on a baseball bat. He filed a patent application for the "Axe Bat" in 2007 and the bat started being used in the college and pro ranks over the following years. In 2012, the
Marietta College Pioneers baseball team won the
NCAA Division III World Series using axe-handled bats. Several
Major League Baseball players have adopted the bat handle including
Mookie Betts,
Dustin Pedroia,
George Springer,
Kurt Suzuki and
Dansby Swanson. • In 2025, the
New York Yankees popularized a "torpedo bat" design, which was made to increase
contact hitting. The widest diameter of the bat is lower down than on standard bats, making the bat look more like a
bowling pin. The bat quickly generated media coverage as the Yankees hit a franchise record nine home runs in their second game, the first three home runs being hit on the first three pitches. MLB stated the new design was legal as it did not exceed the maximum allowed diameter of 2.61 inches (6.6 cm) nor technically go against anything stated in the rules. The "torpedo bat" was designed by Aaron Leanhardt, a field coordinator with the
Miami Marlins. File:Banana bat.gif|Patent No. 430,388 (June 17, 1890) awarded to Emile Kinst for an "improved ball-bat" File:Bottle bat.jpg|
Heinie Groh and his signature "bottle bat" File:Torpedo bat.png|Diagram of a 'Torpedo bat'. The maximum diameter and the length of a torpedo bat are equal to the dimensions of a standard bat == Materials and manufacture ==