<p>An apparatus that fits onto a ladder for securing the ladder safely to a circular pole. The apparatus has a pair of curved arms that are each rotatable about a pivot so that they will close onto a pole. The anus are caused to rotate by a lever portion that contacts the pole as the ladder is forced toward the pole such as when it Is set up and when a climber begins to climb the ladder. As the lever portion is forced against the pole the curved arm rotates to enclose the pole. The arms have a symmetrical control element in the form of meshed gears so that they act symmetrically as they are set up initially and as they rotated into the enclosing position.</p>
申请公布号
WO2010011795(A1)
申请公布日期
2010.01.28
申请号
WO2009US51466
申请日期
2009.07.22
申请人
SCHWENKE, DONALD, RICHARD;CINQUEMANI, MICHAEL, RAYMOND
发明人
SCHWENKE, DONALD, RICHARD;CINQUEMANI, MICHAEL, RAYMOND