In the first Aug. 5 incident, he said, the presence of a foreign object triggered the comb plate impact sensor — near escalator’s “yellow teeth” — shutting off the escalator.

Mr Zhang told China Central Television: "Seven to eight yellow comb plates suddenly burst and trembled... I fell forward, and the escalator was running. It suddenly pulled my feet inside.

But an escalator is a machine and machines break. Accidents happen. Some escalators have a yellow border as an indication not to get too close to the edges, but some do not. All escalators do have ...

which caused cracks in the comb plate." Video of the incident shows the escalator's floor plate breaking away, and Zhang's left foot falling inside the moving staircase. A relative reportedly told ...

A comb-impact switch works by activating the escalator’s brake and stopping the motor if it detects tugging where the steps disappear into the floor – an area known as the comb plate.

Unlike Reno’s design, which was also at the Exposition, Seeberger’s escalator had flat, moving stairs and a smooth step surface without the comb effect seen in modern escalators. Attendees of ...

Otis Elevators changed the name of Reno’s invention to escalator, but they did keep many of Reno’s original features. “[The new owners kept the] rubber-covered chain handrail and a comb of ...

The workers found the escalator’s comb plates and steps were damaged, while a jumper believed to belong to a passenger was found stuck between the steps. The area was sealed off, and engineers ...