A lubricant draining device for draining a lubricant from a closed
mechanical section provided in a machine structure such as a robot, a
machine tool and an injection molding machine. The lubricant draining
device includes a wall defining the mechanical section, the wall
including a drain port communicated with an interior space of the
mechanical section while permitting a lubricant to flow therethrough; a
tube connected at a proximal end thereof to the drain port and permitting
a lubricant to flow therethrough; a blocking member blocking a flow of a
lubricant through the tube in a releasable manner; and a retaining
section retaining the tube at a location adjacent to the wall with the
tube being kept connecting with the drain port. The retaining section may
include a chamber, provided on the wall, for accommodating the tube in
its entirety with the tube being removable from the chamber. The chamber
may be provided with a detachable cover.
