30
Figure # 20 Safety Block and Shim
DO NOT ENTER THE PIT AREA UNTIL THE PIT PROP
IS SECURELY SET (LOCKED) IN POSITION.
SETTING THE SAFETIES
1) Position yourself on the platform and make sure the four lower guide shoes are loose on
the bolts. It should be possible to manually push the platform toward the shaft wall and
sufficiently open the gap at the back of the safety block to place a 1/16" shim on each
safety block. The shims should remain in position when the pressure is released from the
platform (stop pushing). (See Figure # 20).
2) Instruct your co-worker to pull
the manual lowering valve
while you press down on the
tripping pan.
3) While pressing on it, the
tripping pan will move down
once the platform starts to
descend; the safety block’s
knurled wheels will be forced
into position. This will wedge
the safeties securely against
the rails and prevent any
further descent of the
platform.
4) This also “sets” the distance
of clearance at the back of
the safety blocks, as the
1/16" shims are still in place.
Once the safeties have “set”
(supported the load), instruct your co-worker to release the manual lowering valve.
5) With the safeties “set” and the shims in place, tighten the bolts on the two lower main
guide shoes. This will “set” the clearance.
6) Start the pump and move the elevator in the UP direction a few inches. This will apply
tension to the cables, and the safety device will automatically reset itself to its proper
running position.
7) Remember to check the Safety Operated Switch (S.O.S.). This switch must be checked
every time the safeties trip or the elevator will not operate.
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