| 摘要 |
<p>Provided is a drilling machine comprising: a hollow coupling unit which is integrally mounted in the front end of an electric motor driving axis installed at a main body and on which a latching protrusion is axially protruded long in an inner periphery surface and a locking ball is elasticity-biased and protruded in a groove formed on an inner periphery surface; a tool adapter mounted with a locking groove in which the locking ball of the coupling unit is inserted and a guide slot in which the latching protrusion is inserted in one side, and on which a first screw part is formed on the other side; and a cutting tool on which a second screw part to be coupled in the first screw part of the tool adapter is formed on one end part, and the cutting tool used therein. According to the present invention, various cutting tools are easily connected in the tool adapter by providing the tool adapter to be coupled with the coupling unit of the driving axis, thereby facilitating replacement of the tool, improving convenience of the work, and saving a cost of the product due to the reduction of parts since a conventional drill chuck becomes unnecessary.</p> |
