Normally they are suspended on an overhead track. This elevator used to have regular mechanical bumpers until they were replaced by this current door sensor type. Knee-level electric eye door sensors on a 1990s Lift Munich elevator.
The door will slowly close followed by continuous beep or buzzer.
Retrieved from " https: The automatic doors at grocery stores and office buildings are mainly there for convenience and as an aid for handicapped people. When the motor turns the wheel, it rotates the first metal arm, which pulls the second metal arm and the attached door to the left.
Most of those have been weeded out through modernization and diligent state inspectors. PLease continue publishing helpful topics like this. Unlike the conventional locking system though, you do not need to insert the key in the lock to manually open the lock. Wednesday, October 12, 2011 Elevator Doors.
More to Explore. Elevators use two different sets of doors: Contents [ show ]. These are non contact edges and are mostly what we see in elevators today. The door sensors will not work on the fire service mode , hence the fireman's elevator still need mechanical safety edges when the sensor not working.
After a set period of time an alarm sounds and the door will begin to close slowly.
This type of door is used to minimize the size of the hoistway while maximizing the width of the doorway. The reason that we call them two, three and four speed doors is because each panel is moving at a different speed. These are known as single, two, three and four speed doors. The electric motor turns a wheel, which is attached to a long metal arm.
They operate on a mechanical basis and they have to be checked regularly by a technician to insure that they generate no more than thirty pounds of force before the door motion is reversed. I feel that doors are the most important part in the whole system for the simple reason that they are just about the only system the public interfaces with on a constant basis that can cause significant injuries.
This door sensor was manufactured by T. The clutch sticks out just a bit from the car door and when the car descends the clutch engages two small rubber rollers that stick out from the hoistway door. You can see how a typical door-opener system works in the diagram below.
The nudging feature is utilized in the event that the door is blocked by something or someone or mainly if the beam is obscured by smoke from a fire. There are also center opening doors and they can be either two single panels moving in opposite directions or two, three, and four panels on each side moving in opposite directions. Post Comments Atom. Think about it, for your elevator to operate the car door has to be closed completely and the contacts in the safety circuit providing a closed loop.