| 摘要 |
The safety of a user of an extension ladder may be increased by a method of testing whether a fly section has been properly extended and locked into position, which method also impedes inadvertent descent of the fly section. The method of increasing safety of using an extension ladder involves the use of a locking device, comprising an insertion pin designed to be inserted into an insertion hole extending from side to side of a rail on one section of the ladder. The insertion pin is attached to the side of a corresponding rail on the other section of the ladder. The attachment of the insertion pin and the location of the insertion hole are designed so that the insertion pin may be inserted into the insertion hole only when the fly section is properly positioned with respect to the base section, to ensure that rung locks are engaged to hold the fly section in place.
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