Patent ID: 8857918
Filing Date: 2014-10-14
Classification: E21C

Abstract:
1. A cutting tool holding device, comprising: a base, comprising: a positioning tube, comprising: a positioning member positioned in the through hole of the base, wherein the positioning member abuts against the limiting groove of the positioning tube, the positioning member has a cross-sectional area changing gradually along an extending direction thereof which is configured for pressing the positioning tube, the positioning member is substantially formed in a tube shape corresponding to the through hole and is inserted into the through hole from the other end of the through hole, a positioning groove having an inclined plane is disposed on an outside of the positioning member, the positioning groove corresponds to the ridge portion, the inclined plane corresponds to and abuts against the first surface, a tightening thread is disposed on an inner surface of the positioning member for engaging with the threaded body of the screw member, whereby the positioning member is driven by the screw member for changing a pressing degree between the inclined plane and the positioning tube.