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Forums13
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Most Online117 Jan 16th, 2020
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#3496 - 05/09/12 10:15 PM
Re: Saftey Over 40 Years
[Re: Vic]
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Joined: Apr 2011
Posts: 565
Vic
jack of all depts
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jack of all depts
Joined: Apr 2011
Posts: 565
orange county, CA
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Just heard this one today, I'll share it, then take a break!
The fire department rescued someone from a hydro, and blew the doors off the cab. One of the door panels was resting on the hall sill. While the elevator was shut off, waiting for the elevator company to repair it, it drifted downward, wedging that wayward car door panel in between the cab header, and the hall sill.
The piston was not bolted to the platen, and it drifted nearly all the way down. The car was now hanging in space only by virtue of that one car door panel, precariously wedged between the car and shaft, like a jackstand.
An elevator man got on top of the car, and jostled the cab enough to disturb the car door panel. The car fell, and the guy broke some bones, if I heard it right. But he lived.
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#3544 - 05/14/12 04:13 AM
Re: Saftey Over 40 Years
[Re: ifrratedpilot]
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Joined: Apr 2011
Posts: 565
Vic
jack of all depts
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jack of all depts
Joined: Apr 2011
Posts: 565
orange county, CA
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On a fairly large construction job, a helper gets in the pit of an elevator to do something. He hits the stop switch before entering, with a 24' extension ladder propped up against the rail, facing away from the side counterweight.
As he's at the top of the ladder, he notices the car coming down on him. He screams on the radio at the adjustor, who is in the machine room, putting the car through it's paces. After momentary confusion, the proper mainline is turned off, just in time to take out the top few steps of the extension ladder. The car would have killed him for sure.
So much wrong here...No communication before entering the pit, adjustor didn't verify the safety circuit before getting the car up to speed, etc, etc.
Last edited by Vic; 05/14/12 04:17 AM.
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#3660 - 05/24/12 03:15 PM
Re: Saftey Over 40 Years
[Re: Vic]
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Joined: Jan 2012
Posts: 422
christycollett
addict
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addict
Joined: Jan 2012
Posts: 422
Monterey, CA
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We had just completed Phase One recall on the service car at First National Bank and it was back in service and running fine until … a few months down the line.
I was on call when an overtime call came in on this very elevator. I checked in with the security guard and went looking for the elevator. The PI lights were out so it was a simple matter of picking a couple of locks to find the car. I picked the lock at the bottom floor and no elevator. I traveled to the top floor, picked that lock and still no elevator. I went to mid travel, picked that lock and still no car. But something else was missing … the Comp Ropes. I went back to the top floor for another look, picked the lock again and checked out the hoistway. The traveling cables were there OK, but wait a minute … this is the top landing. This time looked up and there it was, way up in the top of the hoistway. It was time to go to the machine room. I looked down the cable block out in the machine room floor and two inches below the slab was the two to one sheave. By now it was midnight and there was nothing that could be done anyway. I gave the security guard the bad tidings and headed for home.
Because his job was hanging by a thread to begin with, Russ was always acutely aware of his profit and loss statement. Overtime calls on full maintenance jobs stretched that thread a little tighter. So every morning when he hit the office he checked the log for overtime callbacks. If there had been a call you could bet on getting a page at 7:30 am on the dot. The twenty question routine could get a little irritating before the start of the work day. So with his hand on his wallet the questions would begin. “What happened at First National last night?” “DC Overload was tripped.” “What caused that?” “The overhead.” “Gasp” then “What overhead?” “The overhead at the top of the hoistway.” “Did you get the car running again?” “No.” “Why not?” “It was on the safeties.” “What stopped you from running the car up to release them?” “The machine beams.” Phone hits carpet. Fumbling noise. “Where are you?” “First National.” Dial Tone.
Russ didn’t show at First National for some time, probably because the Gin Joint near the shop didn’t open until eight. It was time to check out the damage a little further. I knew the comp ropes were missing so I started at the pit. The comp sheave was lying on its side over in a corner. The comp sheave had safeties so the guide rail mounting hardware had pulled out of the pit floor. There was a lot of rope piled up in the pit, but not all of it. The ropes were hanging off something up near the top of the hoistway. Picking the lock up on the twentieth floor solved the mystery of why all the comp ropes weren’t in the pit. When the comp hitch pulled off the safety plank, somehow one of the ropes looped itself over a leveling vane bracket and after sawing it nearly in half, hit its center of gravity and slid to a halt.
Tommy and I started the repair by picking locks, pulling out about 20 feet of rope, cutting it off and piling it on a cart. Needless to say the building personnel were a little concerned about all this chopped up cable lying on a four wheel dolly. With all the comp rope removed from the hoistway we had to get the car off the safeties. About this time Russ shows up, looks around, and shakes his head and heads back to where he had spent the morning.
There was about four inches of clearance between the car and the overhead so there was enough travel left to get the car off its flex guide safeties. The last landing for the car was a mechanical space that had a 25’ high ceiling. To get into the car we used an extension latter to get high enough to cut a hole in the wall above the cars entrance.
Backing up here … a few months back we had installed Phase One and Two on the six passenger cars. There was a new console in the lobby for the security guard. The console had the Fire Service switches along with some security features. The guard that manned this station was, to say the least, overwhelmed by all the switches and lights and had little or no training. We had a ladder up and were in the process of cutting a hole in the wall when something caught our eye. There was a smoke detector on the wall just above the elevator entrance. You guessed it … the dust from our excavation activated the sensor right in front of our eyes.
The six passenger cars were now sitting at the lobby, doors open on Phase One. The guard panicked, hit the evacuation alarm and called the fire department. By the time I hit the stairs, making the 25 floor descent, all the while squeezing by fleeing building occupants, there were 200 evacuees in front of the building when the San Diego Fire Department pulled up. With a sheepish grin and a turn of the By-Pass switch, normalcy was resumed and it was back to work.
This time I hijacked one of the passenger cars for our personal use, just in case of another disaster. We were able to get inside the car and go through the escape hatch to set up our rigging. We set up an A-Frame in the machine room and with about a ½” to spare, hoisted the car off its safeties. From that point on it was a matter of replacing the comp hitch, repairing the pit equipment and replacing the comp ropes. While cleaning down the hoistway the second smoke detector was activated. This time I was able to get to the Guard Console and prevent him from touching anything. The turn of a key switch and a vanishing act prevented another fiasco without anyone even noticing.
We knew what happened, but not why? The car had so much overhead that when it traveled up into the overhead it didn’t break traction. There was so much overhead that the car traveled right on past the end of the hoistway normal limit cam. The final limit cam mounted on the car ended up above the final limit switch. There it sat stuck in the overhead, grinding away until finally the DC overload tripped, shutting down the whole deal. By rights the car should have broken traction when the counter weights bottomed out on the buffer. Haughton had had problems in the past with traction and never really addressed the issue. We did install cam extensions and the car was returned to service. I answered another call on this elevator a few months later. The car was in the upper final limit and stayed there this time. By chance I started checking the running circuit and felt a faint buzz on one of the relays. There should be no buzz here. This relay had a 220 VDC coil and with the safety circuit open there should be no voltage present whatsoever. The meter indicated around a 140 VAC. This car was an older Haughton ALNC with 220 VDC running circuit and above ground 208 VAC for most of the other logic. This was a throwback to the “Good Old Exciter” days. Fortunately the problem was right out in front of me; I just had to find it. I started pulling controller wire and checking the wiring diagram and low and behold there was a wire that didn’t belong on the DCLB relay. During the Fire Service upgrade we had added a new wire on top of an old wiring change. This wiring change was buried under a pile of old black controller wiring. It also wasn’t on the as-builts that engineering used to engineer the Fire Service revisions. This field wiring mistake plugged 100 VAC into the 220 VDC running circuit. This was not enough to energize the 220 DVC running circuit, but under certain conditions, this stray voltage could keep the running circuit powered up when it shouldn’t happen at all. This was a wake-up call. It took several months for this problem to show up. All of the above makes you stop and think about all the wiring changes made on dozens of elevators still out there in service. What about that jumper that’s missing from your tool box. Anyone who has worked on hundreds of elevators has found that missing jumper left by some other guy. I know I have.
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