No person who is the owner, lessee or occupant of any premises adjoining any street, parking field or parking field walk shall place or keep, or permit to be placed or kept, on any sidewalk in front of, adjoining or adjacent to such premises, any goods, wares or merchandise. Nothing contained herein shall prohibit persons from temporarily placing goods, wares or merchandise or household furniture on the sidewalks for purposes of loading or unloading, provided that the same are removed within a reasonable time, and provided that sufficient safe passage room for pedestrians is maintained.