Operator`s manual

The Locking Pawls are designed to allow ladder rungs to ride over the top of the pawls during extension,
when the Operating Lever is unlocked by pressing them down under tension of their return springs (11).
When the ladder rung has passed over the Locking Pawl, the pawl is returned to its original position by the
return spring.
When the Lock Balancer (4) rotates forward, it carries the Grooved Roller (3) forward at the same time.
This lengthens the cable (12) which is held vertically over the Wire Lever (10) controlling the Locking Pawl
on ladder Section 2, by the pulley (6). Lengthening cable (12) causes the Wire Lever (10) to rotate under
pressure of the Locking Paul springs, thereby causing the Locking Pawls stored in Section 2 to swing up
between the rails of Section 3. The action of the Locking Pawl Assembly in Section 2 is identical to the
action of the pawl assembly in Section 1, described above, and takes place concurrently.
As cable (12) acts on fittings mounted on both Section 1 and Section 2, it must be long enough to reach
between the Grooved Roller (3) and the pulley (5) when the ladder is fully extended. It must also be
channelled to run from Section 1 to Section 2. This is accomplished by running an appropriate length of
cable, equivalent to the distance between (3) and (5) when the ladder is fully extended, along the outside
of Section 2. The Cable is fastened to Section 2 at (13) and passes around the canted pulley welded to
Section 1 (5) which transfers it to the outside of Section 1 and onto the Grooved Pulley (3). This
arrangement ensures the proper length of cable and acts as a "take-up" to prevent slack during the
operation of the ladder.
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