METHODS AND APPARATUS FOR FORCE MANAGEMENT IN FALL PROTECTION APPARATUS

摘要

Methods of force management for a force management anchor (FMA) include apparatus between a post and a base plate that resist post rotation under fall loads, the apparatus resisting said rotation at a constant torque. A peak constant torque is less than a torsional “tear-out” capacity of a surface for maximizing energy absorption. While the fall force vector remains generally parallel to the base plate during a fall, the post is movable between an upstanding and a lowered orientation resulting in a variable moment arm and a resisting force that also varies for maintaining the torque substantially constant. Apparatus can include devices between the post and the base plate such as a torsion rod, a friction clutch or a cam arrangement. Other approached include designed deformation of the post itself, such as a through tapered post.

主权项

1. A method for managing forces of a fall using a fall management anchor anchored to a surface, the method comprising:
directing a fall force vector into a distal end of an upstanding post secured at a proximal end to a base plate anchored to the surface, the fall force vector being oriented generally parallel to the base plate; applying a substantially constant resisting torque to the post for absorbing energy as a distal end of the post rotates in response to the fall force vector and a moment arm of the post varies from an initial upright position towards a tipped position; and transferring the constant resisting torque into the base plate, the resulting moment at the base plate being at or less than a threshold tear-off torque.