Quantcast Normal Terminal Stopping Devices - mo1180219

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At each stop, note the relation of the car platform sill to the landing sill. Note any tendency of
operating push buttons to stick. When an automatic leveling device is provided, the accuracy of
stopping in both directions of travel should be noted at landings to determine whether any
readjustments are necessary.
9.4 CAR TOP INSPECTION
9.4.1 Counterweight
If provided, examine the nuts and cotter pins at the top and bottom of the rods and the frame
rods to determine if they are in place and that filler weights are securely held in place. Determine
that the counterweight guide shoes are securely fastened to the frame and that the guiding
members are not worn excessively. Also determine if swivel-type or roller-type guide shoes are
free to move as intended. Inspect the counterweight suspension fastenings.
9.4.2 Suspension And Fastenings
Examine the condition of the fastenings at the car and machine or counterweight ends to
determine if they have been properly made up. The A10.4 Code requires that cars and
counterweights, except for Hoists having direct-plunger hydraulic or rack and pinion machines,
shall be suspended by two wire hoisting ropes for drum machines and three for traction machines
secured to the car or counterweight or rope hitch by babbitted sockets, rope clamps, or equally
substantial fastenings. Wire ropes shall not be lengthened or repaired by splicing. The winding
drum ends of car and counterweight ropes shall be secured inside the drum, and there shall be not
less than three turns of the rope on the drum when the car or counterweight has reached the
extreme limit of its overtravel.
9.4.3 Normal Terminal Stopping Devices
Run the car to the top of its travel at slow speed to examine the normal terminal stopping
device. On traction hoists and on most winding drum type installations, this device usually
consists of a switch or switches installed in hoistway actuated by cams on the car. In some cases,
however, normal terminal stopping devices of traction hoists may be located in the machine room
or overhead machinery space and be mechanically connected to and driven by the car. Where the
normal terminal stopping device of traction hoists is so located and the required broken-drive
device is located on top of the car, manually open it with the car at rest. The opening of this
switch should prevent the car from starting. In the case of some winding drum machine
installations, the device is part of an automatic stop-motion switch mounted on and operated
directly by the driving machine. Determine that stopping switches and cams are in correct
alignment and are securely fastened in place. Also determine the condition of the limit
switch rollers, as reduction of the effective roller diameter due to either wear or loss of the tires
9-5





 


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