| 摘要 |
<p>A cylindrical winch tube cover is placed over the rear end of the hoist shaft for blocking access to the rear end of the hoist shaft. A lock bracket is mounted on the winch tube cover, and a padlock secures the lock bracket to the winch tube cover and prevents removal of the winch tube cover from the hoist shaft. The shackle of the padlock passes through a pair of aligned holes in the lock bracket and a groove in the winch tube cover.</p> |
