Patent ID: 8491235

Claim:
A rail drilling machine for drilling coupling holes in the web of a rail, wherein a head and a foot are formed in an upper portion and a lower portion of the rail, respectively, so as to extend along the longitudinal direction of the rail, the web being formed between the head and the foot so as to extend along the head and the foot, wherein the rail drilling machine includes a drive source, a cutter support mechanism, and a support base, the cutter support mechanism having a cutter attaching portion that is driven by the drive source to rotate, and the support base supporting the drive source and the cutter support mechanism, wherein, in a state where the rail drilling machine is attached to the rail, the drive source, the cutter support mechanism, and the support base are located on one side in the widthwise direction of the head, foot, and web of the rail, wherein a support plate having an upper support surface and a lower support surface is provided at each of both ends of the support base in a longitudinal direction, and wherein the upper support surface and the lower support surface of each support plate contact a lower surface of the rail head and an upper surface of the rail foot, respectively, so that the support base is prevented from moving vertically with respect to the rail, wherein the support base has a magnetic sticking portion located between the support plates, the magnetic sticking portion having a sticking surface that is stuck to a side surface of the rail web, wherein, in a state where the sticking surface of the magnetic sticking portion is stuck to the side surface of the web, the cutter attaching portion of the cutter support mechanism is arranged in such a manner that a rotation axis of the cutter attaching portion extends, on an outer side of the support base, toward the web, and wherein each support plate has two side surfaces that contact a side surface of the rail head and a side surface of the rail foot, respectively, in a state where the sticking surface of the magnetic sticking portion is stuck to the side surface of the web.