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Counterclockwise/Down direction (unscrewing the clamping force on the brake). This puts the
unit in "Free Chain Mode" allowing the chain to be pulled through the hoist in either direction for
easy "set up". Note: In free chain mode, if the speed or acceleration of the chain passing
through is excessive then the brake will set. The selector knob must be reset to continue free
chaining.
Label Located
on the
Free Chain
Hand wheel
Applying a Load; The brake will automatically engage in response to a load being applied.
Simply move the lever ratchet selector (26) to the "UP" position and begin cranking the lever
handle (44). The selector is in no way connected to the brake mechanism, it simply switches the
ratchet direction of the lever, in a similar way as the common ratchet wrench found in most tool
boxes.
Improved Safety: The user can not confuse the operation as engaging the load automatically
sets the brake. This design will apply the brake in response to a falling load even if left in "free
chain mode" with the lever selector in neutral. However, the hoist brake may not respond to loads
less than 2% of rated capacity as they cannot be distinguished from the normal forces applied in
free chaining.
Competitors demonstrate against this brake design, by lifting a very light load, then
moving the ratchet selector to neutral position and giving the free chain selector knob a twist or
slap in the down direction. The light load may descend convincing some safety concerned persons
that light load dropping is a hazard with this design. In fact, if a falling load is applied to most
competitive lever hoist, if mistakenly left in free chain mode at "set up", there is nothing to resist a
load from falling.
Ease of maintenance is a virtue as the parts are simple and few. Nothing is spring loaded
requiring caution while disassembling. Brake Parts do not require timing or special positioning
during assembly.
Locked Brake Release: A locked brake will occur if a hoist is suddenly relieved of the load off of
the lower hook by some other means or if used in some applications like pulling down walls. The
brake may also lock if abused by "Two Blocking", a nautical rigging term for pulling the lower hook
block tightly against the hoist frame. In any event, to release a locked brake, turn the directional
lever to the "Down" position and pull sharply on the lever handle.
ALL MATERIAL HANDLING INC. ● 900 N. Franklin, Suite # 401 ● Chicago, IL 60610
Web: www.allmaterialhandling.com ● E-Mail: Sales@allmaterialhandling.com
PH# (312) 698-8658 ● Toll Free# (877) LIFT AMH ● FAX # (312) 274 9780
Lever Chain Hoist
Automatic Load Brake Operation
AMH
Lever Ratchet Selector
Shown in the UP Position
TM
29
SB002
Bulletin:
Date: 03/23/09
Page:
2
of 2
By: T. Gagnet
26
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