Drilling machine

Abstract

A drilling machine comprises a power motor unit coupled with a spiral rod and a drill bit shaft and assembled in a mounting frame using a positioning disc. The arbor of power motor mounted on the mounting frame directly drives the drill bit shaft. The spiral rod is disposed at the periphery of drill bit shaft. A plurality of cutters are arranged between the drill bit and spiral rod at the outer perimeter of drill bit with a hollow guide notch above the cutters. The spiral rod is mounted in the positioning disc and engage a plurality of planet gears. When the arbor of power motor turns, it directly drives the drill bit shaft, drives the fast turning of drive gear at the periphery of drill bit shaft, resulting in different turning speeds with the drill bit shaft turning slowly and the spiral rod turning fast.

1 . A drilling machine comprising a power motor unit coupled with a spiral rod and a drill bit shaft and assembled in a mounting frame using a positioning disc, the arbor of power motor directly driving the drill bit shaft, a plurality of cutters being arranged at the outer perimeter of drill bit of the drill bit shaft and having a hollow guide notch above, the spiral rod at the periphery of drill bit shaft matching and engaging a drive gear and a plurality of planet gears in the positioning disc and being assembled into one body between two rotating discs, such that when the arbor of power motor turns, it directly drives the drill bit shaft, and at the same time, drives the fast turning of drive gear at the periphery of drill bit shaft; when drilling a hole, the downward drilling of center tip of drill bit in turn guides the peripherally arranged cutters to perform rotary cutting and drilling, thereby achieving smooth drilling while easing the burden on the hands of operator. 
   
   
       2 . A drilling machine as claimed in  claim 1 , wherein the spiral rod is positioned in the positioning disc through a drive gear at its top and engages a plurality of planet gears, which are assembled into one body between two outer rotating discs, such that when the arbor of power motor turns, it directly drives the drill bit shaft, and at the same time, drives the turning of a connecting plate and the rotating discs such that the plurality of planet gears between two rotating discs would travel along the inner annular gear of the positioning disc, leading to the fast turning of drive gear at the periphery of drill bit shaft and resulting in different turning speeds with the drill bit shaft turning slower than the spiral rod. 
   
   
       3 . A drilling machine as claimed in  claim 1 , wherein when drilling a hole at a predetermined position, under the action of spiral rod turning faster than drill bit, the material drilled is continuously and rapidly brought out of a hole through the rotary blades without being stuck or seriously wearing the drill bit, thereby achieving smooth and fast drilling, while easing the burden on the hands of operators which are prone to injury from continuous vibration. 
   
   
       4 . A drilling machine as claimed in  claim 1 , wherein the drill bit is made of different materials in view of the drilling occasion for applications to drilling farm soil, civil work, cement, steel plate, mining or geological survey. 
   
   
       5 . A drilling machine as claimed in  claim 1 , wherein the number of teeth of planet gears traveling along the inner annular gear of positioning disc situated between two rotating discs can be adjusted such that the drive gear at the periphery of drill bit shaft can work under varying turning speeds in cutting and drilling.