Anchor Demonstration

We are often asked how this anchor works, and will it stop a vandal from pulling a sign post from the ground.   Also, will this anchor make it more difficult for maintenance crews to replace a sign post?   To answer these questions, we performed a controlled test using a typical 4 inch by 4 inch wood sign post for a simulated vandalism attempt.  

To simulate the upward pull on the sign post, a test stand was erected.   The test stand supported a winch that pulled upward on the installed sign post, applying sufficient load to trip the release mechanism on the PostLock anchor   A dynamometer recorded the maximum upward force.    The purpose of this test was to demonstrate that the PostLock anchor is strong enough to keep signs in the ground.    You can see on the chart below, the PostLock anchors resisted an upward pull of over 500 pounds, which will stop most juvenile vandals.

This release mechanism is a key feature of the PostLock anchor design.    The anchor is nailed securely to the post, but can be unlocked for maintenance.    To release the buried anchor, you simply strike the top surface with a steel bar, and the anchor releases the post.     An alternate method is to use our patented sign post puller, which works especially well on sign posts that are broken off at or below ground level.

Summary results for 10 anchors tested.   The resisting force ranged from 544 pounds (minimum) to 866 pounds (maximum).