Patent ID: 7883269

Claim:
A combination, comprising: a track rail of a guide device having a rail mounting hole therein, and a closing cap including a fitting portion having an outer diameter larger than an inner diameter of the rail mounting hole, to be press-fitted into the rail mounting hole; and a leading end portion to be inserted into the rail mounting hole before press-fitting the fitting portion into the rail mounting hole, for provisionally positioning the closing cap with respect to the rail mounting hole; wherein the leading end portion is provided with a positioning protrusion having a tip edge portion, protruding from a periphery of the leading end portion, the tip edge portion having an outer diameter which is the same or slightly larger than the inner diameter of the rail mounting hole, wherein the fitting portion comprises a first fitting portion and a second fitting portion each having a disc shape, the first fitting portion and the second fitting portion being coupled with each other through a columnar spacer portion having an outer diameter smaller than the inner diameter of the rail mounting hole, and wherein the first fitting portion is positioned between the leading end portion and the second fitting portion, the first fitting portion having an outer diameter larger than the inner diameter of the rail mounting hole, and the second fitting portion having an outer diameter which is smaller than the outer diameter of the first fitting portion and is larger than the inner diameter of the rail mounting hole.