Device for mounting sign of direction to post

A device for mounting a sign to a post, comprising:

• a cylindrical connector mounted on the post, said connector being exteriorly stepped at its middle portion, thus having a small-diameter part and a large-diameter part at its upper and lower parts, respectively;
• an annular locking member fitted over said small-diameter part of the connector, said locking member having a plurality of longitudinal locking grooves on its external surface at regularly spaced positions, said locking grooves individually having a T-shaped cross-section;
• and
• a sign holder slidably and detachably locked to said locking grooves of the locking member and used for holding the sign on the post, said sign holder being provided with both a slide insert part and a sign holding part, so that the sign holder is locked to the locking member at the insert part while holding the sign at the sign holding part, with said insert part having the same cross-section as that of each of said locking grooves and said sign holding part being slitted to receive the sign and being holed to fix the sign.