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re: Human error blamed in elevator accident that killed Boston University teacher
Posted on 10/26/20 at 5:26 pm to John88
Posted on 10/26/20 at 5:26 pm to John88
quote:
nspectors said O'Connor was moving a large package into the elevator when it struck a gate switch at the top of the car.
A maintenance person was in the basement and had called for the elevator.
Inspectors said O'Connor hit the "go" button in the old-fashioned elevator, which cause the accident. When the package struck the gate switch, the elevator began moving towards the basement.
She then became pinned between the wall and the elevator. Police said O'Connor died of traumatic asphyxia.
I don't think I'm any closer after reading that to understanding what happened.
2
Posted on 10/26/20 at 5:56 pm to shutterspeed
quote:
I don't think I'm any closer after reading that to understanding what happened
Big arse package she had hit the interlock switch that indicates the gate is closed so it's safe for the car to move.... in reality it was not, when the car went down she fell and was pinned and ultimately killed.
Posted on 10/26/20 at 6:43 pm to shutterspeed
Elevators are simple for the most part and work off an inputn of switches.
In this case the elevator is called down and the instruction in the relay logic holds that command until the door switch (closed in this case) makes/breaks to satisfy the line or "rung" in the relay "ladder" logic. The next line of command is executed.
The maintenance guy pushed the button in the basement to call the elevator. When her large package hit the closed button at the top of the cage as she was entering/exiting the elevator... The relay/switch logic saw the input come in and executed the next command and the elevator moved down to it's next instruction. She would have been pinned.
In this case the elevator is called down and the instruction in the relay logic holds that command until the door switch (closed in this case) makes/breaks to satisfy the line or "rung" in the relay "ladder" logic. The next line of command is executed.
The maintenance guy pushed the button in the basement to call the elevator. When her large package hit the closed button at the top of the cage as she was entering/exiting the elevator... The relay/switch logic saw the input come in and executed the next command and the elevator moved down to it's next instruction. She would have been pinned.
This post was edited on 10/26/20 at 6:44 pm
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