Sliding Extension Ladders: A
Tutorial
Interested in knowing a little more about sliding
extension ladders? This short tutorial about sliding extension ladders should
answer some of your questions.
Extension ladders that slide are classified into different grades by the
American National Standards Institute. This kind of extension ladder is used for
many purposes and the grades help determine these uses. The classifications of
this type of extension ladder also covers weight capacity.
Extension ladders that slide may be made from wood or aluminum. These ladders
consist of telescoping sections. These ladders have rails on the top section
that fit inside the rails of the bottom section. These bottom rails are held to
the top rails by brackets at the top of the bottom section.
The top section of these ladders are usually pulled up by a rope. There is a
ratcheting device that engages the rungs of the bottom section and this prevents
the top section from sliding back down when the extension ladder is in use.
Since the sections of these extension ladders must overlap for the ladder to
operate, the maximum extended length of the ladder is less than its size. Keep
this in mind when you are planning to buy this kind of extension ladder.
Most extension ladders that slide have two sections but there are extension
ladders that have three sections. If you are looking at extension ladders in
Canada or the United States you will find that these ladders are sized by the
sum of the lengths of the sections.
Extension ladders that slide should be used at an angle of 75.5 degrees which is
equivalent to the length of the ladder being four times the horizontal distance
between the point of support and the foot of the ladder.
Refer to this tutorial if you have questions about sliding extension ladders.
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