49
Left: Bentley's patent with corkscrew shape
end on fence post
Right: George Guile patented fence with
“
helical or corkscrew shaped points
”
on posts
More Ideas
Many other inventions can be found which use a
―
corkscrew
‖
to secure something in
the ground such as mailboxes, umbrella anchors, theft proof signs, climbing aids, and
laundry drying hangers.
Bobby Gibson's 1996 Umbrella Anchor - U. S. Patent 6,199,569
