Patent ID: 7156002

Claim:
A tool shaft and tool bit arrangement comprising: a shaft, said shaft having a first axis a hexagonal center through hole axially extending through front and rear ends thereof, a first locating and a second locating groove respectively extending around the periphery near the front and rear ends, a first radial through hole formed in said first locating groove in communication with said hexagonal center through hole, a second radial through hole formed in said second locating groove in communication with said hexagonal center through hole; a plurality of tool bits each having a locating groove located thereon, respectively movably inserted into the hexagonal center through hole of said shaft and arranged in a line; a locating block movably mounted in said first radial through hole of aid shaft for holding down one of said tool bits in the front end of said shaft, said locating block having a beveled bottom edge for engaging into the locating groove of one of said tool bits; a steel ball movably mounted in said second radial through hole of said shaft for holding down one of said tool bits in the rear end of said shaft; a first clamp fastened to said first locating groove to hold down said locating block in said first radial through hole; and a second clamp fastened to said second locating groove to hold down said steel ball in said second radial through hole.