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3-4. PULLING AND PIVOTING HOIST AND LOAD.
a. On Pendant Throttle Control models, the valve handle is
supported by a strain cable that is suitable for pulling trolley
suspended hoists when empty or lightly loaded. Use a tag
line or pole to pull or push loads to traverse heavily loaded
hoists. Observe caution to stay clear of loads.
b. To pivot load, push on one corner of load. Lower hook will
swivel through 3600 to permit load to be swung to the desired
position. The upper hook (hook suspension models) is also
designed to rotate so that side pulls will swing hoist to face the
Figure 3-2.
Pendant Throttle Control Handle
b. Pendant Throttle Control.
(1) Depress throttle valve lever
marked “UP” to raise load. See Figure
3-2.
(2) Depress throttle valve lever
marked “DOWN” to lower load.
(3) Release lever being
depressed to stop either lifting or
lowering.
(4) Speed of lifting and lowering
is varied by the position of the throttle
valve lever being depressed.
12003
Figure 3-1. Pull Cord Control Handles.
turned on, hoist is operated in the following manner:
a. Pull Cord Control.
(1) Pull top handle (marked with arrow pointing up) down to
raise load.
(2) Pull bottom handle (marked with arrow pointing down)
down to lower load.
(3) Release handle being used to stop either lifting or
lowering.
(4) Speed of lifting and lowering is varied between slowest
(inching) to full speed by the pull exerted on control handle
being used.
load, thus reducing side thrust.
3-5. UPPER AND LOWER LIMIT STOPS. A lower block and
chain operated limit stop is provided to guard against over
travel of load in either raising or lowering direction, which can
cause damage to hoist. When highest position is reached, the
lower block trips the control lever (Figure 3-3). When lowest
position is reached, the tail end of load chain trips the control
lever (Figure 3-4). The control lever is connected to the control
shaft which actuates inlet valves controlling air pressure to air
motor. Limit stops are intended as safety devices and should
not be used as a routine basis to stop travel of lower block or
shut off hoist.
Equipment covered herein is not designed or suitable
as a power source for lifting or lowering persons.
WARNING
Safe operation of an overhead hoist is the operator’s
responsibility. Listed below are some basic rules that can make
an operator aware of dangerous practices to avoid and
precautions to take for his own safety and the safety of others.
Observance of these rules in addition to frequent examinations
12011A
Figure 3-3. Control Lever Being Tripped by Lower Block.
12012A
Figure 3-4. Control Lever being Tripped by
Tail End of Load Chain.
