Elevation-adjustable baseball batting-training apparatus

Abstract

A baseball batting-training apparatus includes a base plate having a plurality of upright stub tubes, a telescopic stick selectively inserted into one of the upright stub tubes and adapted to hold a ball for batting, and a lock nut threaded onto the selected upright stub tube to lock the telescopic stick in position.

What the invention claimed is:  
     
         1 . A baseball batting-training apparatus comprising: 
 a base plate, said base plate comprising a plurality of upright stub tubes, said upright stub tubes each having an axially extended center hole and an externally threaded split top neck around said center hole;    a telescopic stick selectively fastened to one of said upright stub tubes of said base plate, said telescopic stick having a top end terminating in a ball cup adapted to hold a ball for batting; and    a lock nut coupled to said telescopic stick and threaded onto the externally threaded split top neck of the selected upright stub tube of said base plate to lock said telescopic stick.    
     
     
         2 . The baseball batting-training apparatus as claimed in  claim 1  wherein said telescopic stick comprises a sleeve fitting the axially extended center hole of said upright stub tubes, said sleeve having an externally threaded split neck at one end thereof, a sliding tube inserted into said sleeve, and a lock nut threaded onto the externally threaded split neck of said sleeve to lock said sliding tube in said sleeve at the desired elevation.  
     
     
         3 . The baseball batting-training apparatus as claimed in  claim 2  wherein said sleeve has a longitudinal row of retaining holes, and said sliding tube has a spring element mounted on the inside near a bottom end thereof, said spring element having a retaining rod extended out of said sliding tube for engagement into one of the retaining holes of said sleeve.  
     
     
         4 . The baseball batting-training apparatus as claimed in  claim 3  wherein said spring element is a compression spring.  
     
     
         5 . The baseball batting-training apparatus as claimed in  claim 3  wherein said spring element is a plate spring.  
     
     
         6 . The baseball batting-training apparatus as claimed in  claim 3  wherein said spring element is made of rubber.