| 摘要 |
A ladder sitting on a rack is secured in position by a spring loaded pivoting arm which engages a ladder rung and is secured in position. The pivoting arm is mounted in a housing which is attached to the rack. The pivoting arm is locked into place to prevent removal of the ladder. A second arm engaging a siderail prevents the ladder from being swung out from under the pivoting arm. To release the ladder, the lock is removed and the pivoting arm is raised and rotated clear of the ladder. A second housing can be attached to the rack spaced from the first housing. A spring loaded pivoting arm from the second housing engages a siderail of the ladder and is secured in place.
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