Baseball practice bat

• US 4,274,631 A
• Filed: 03/08/1979
• Issued: 06/23/1981
• Est. Priority Date: 03/08/1978
• Status: Expired due to Term

• Current Assignee: Tadao Hayazaki
• Original Assignee: Tadao Hayazaki
• Inventors: Hayazaki, Tadao
• Primary Examiner(s): Pinkham, Richard C.
• Assistant Examiner(s): BROWN, THEATRICE
• Application Number:
  US06/018,788
• Time in Patent Office: 838 Days
• Field of Search: 273/26 B, 273/81 R, 273/81 D, 273/26 R, 273/183 R, 273/183 D, 273/186 A, 273/186 R, 273/194 R, 273/186 C, 273/81.2, 273/29 R, 273/193 R , 273/193 A
• US Class Current: 473/457
• CPC Class Codes: A63B 2069/0008 for batting
• CPC Class Codes: A63B 2102/18 Baseball, rounders or similar games
• CPC Class Codes: A63B 59/50 Substantially rod-shaped bats for hitting a ball in the air, e.g. for baseball
• CPC Class Codes: A63B 59/59 with sound generators, e.g. with internal movable members therefor
• CPC Class Codes: A63B 60/04 Movable ballast means A63B15/005 takes precedence
• CPC Class Codes: A63B 60/06 Handles
• CPC Class Codes: A63B 60/08 characterised by the material
• CPC Class Codes: A63B 60/10 with means for indicating correct holding positions A63B60/12 takes precedence
• CPC Class Codes: A63B 60/16 Caps; Ferrules
• CPC Class Codes: A63B 60/50 with through-holes A63B60/18 takes precedence; for stringing purposes A63B49/00
• CPC Class Codes: A63B 69/0002 for baseball

Abstract

A baseball practice bat to emit hitting sounds upon swinging is disclosed. The bat comprises a bat body with a hollow interior, a pipe fastened within the body with its top end fitting into a top cap and with its bottom end fitting into a grip, guide slits longitudinally formed in the pipe, a ring-shaped weight slidably mounted around the pipe, a supporting pin extending through the slits with its ends fixed to the weight, and an elastic member extending inside the pipe with its top end fixed to the weight at the pin.

Claims

1. A baseball practice bat comprising a body with a hollow interior, a pipe fastened within the body with one of its ends fitting into a cap at one end of said bat and its other end fitting into the handle at the other end of said bat, a pair of diametrically opposed, guide slits longitudinally formed in said pipe, a weight slidably mounted exteriorly around said pipe, a supporting pin extending through said guide slits and said weight and slidably fixing said weight to said pipe, and an elongated elastic member extending inside the pipe having one of its ends fixed to the weight at the pin and its other end fixed at the handle of the bat.

2. A baseball bat according to claim 1, wherein said body is made of aluminum.

3. A baseball bat according to claim 1, wherein said elastic member is a spring coil.

4. A baseball bat according to claim 3, wherein said spring coil is connected to a nut movably disposed around an elongated member, said elongated member extending from said grip into said spring coil, said stick having a groove on the bottom surface thereof, whereby said stick can be rotated to cause the nut to move for adjusting said spring coil.