Elevator Door System Parts
There are a variety of parts that make up the elevator door system. Some of them are easy to replace or fix, while others can be more complex and require a professional elevator technician.
The doors on the cars and the hatch doors opening into the elevator shaft are mechanically operated by an electric impulse from the elevator controller. However, there are also other things that happen behind the closed doors that we do not see.
Rollers
A pair of rollers is an essential part of the elevator door system. They are important because they are responsible for controlling the movement of doors, and they also prevent them from getting caught in the track and falling over.
A set of these rollers is made up of a pair of wheels that are attached to the rail of the elevator. Each wheel has a rim that is fabricated from a material such as aluminum or carbon steel. The rim contains a bearing and fastener that is adapted to attach the roller to the door hanger.
Each roller has a thermal barrier applied to it. The thermal barrier is designed to prevent heat from transferring from the tire material to the rail. In this way, the roller is able to perform its task efficiently and without any trouble.
This is especially important in a fire situation, when the doors and the header may be exposed to heat, which would then transfer the heat to the track, hanger, and any other component that is directly in contact with it. Alternatively, the air around the doors could also become heated and rise under natural convection. This would heat the track, hanger, and other components that are in contact with it, which could then heat the rollers and further increase the temperature of the doors and header.
In addition, the thermal barriers are designed to reduce the amount of space that is required for the rollers to be positioned in front of the header or wall of the elevator. This can be an important consideration since it means that the door assembly can fit more closely to the elevator car while maintaining code clearances.
These thermal barriers are preferably coated with a material that is very low in thermal conductivity, such as a coating of carbon steel or aluminum. This type of material is very thin and will reduce the amount of heat that is transferred to the roller from the header or the wall.
In order to achieve the purpose of this invention, it is necessary for the elevator door to have a pair of vertical links that are able to link the rollers to each other. These links are preferably designed with diverging end flanges. This will allow them to be reengaged after manual disengagement for maintenance purposes.
Cables
Cables are an important part of the elevator door system. They provide support to the rollers that carry the car and maintain the door at a true, perpendicular position throughout its travel. They also guide the doors and thereby help prevent them from moving or opening prematurely.
The cables that support the rollers and keep the doors at a constant, perpendicular position are made of steel wires. They are typically between four and eight cables that are wound around Elevator Door System Parts one another. This ensures that the elevator can still operate in case of a cable failure.
In order to maintain the reliability of the locking system, the wires must be able to withstand repeated bending. The wires must also be able to withstand the repeated sharp bends that can occur when the rocker mechanism moves between being engaged and disengaged.
To achieve this, the bending of the wires is kept to a very low level. This is achieved by a curved bearing surface that acts to flex the wires at pinch points where they are most likely to be bent.
This flexing keeps the stress on the wires lower than would be achieved with six strand ropes. The rounder cross section of the wires also allows for easier adjustments to worn grooves, as well as better fatigue bending properties.
A hold-down is mounted to the door of the elevator to retain the cable housing in close proximity to the door while permitting movement parallel with the door in response to adjustment of the path length between the driving end of cable 20 and bracket 27. As shown in FIGS. 4 and 5, when adjusting head 31 is turned for increasing insertion into bracket 27, then cable housing section 26 shifts upward as indicated by arrow A in FIGS.
Elevators also have a number of safety mechanisms that are designed to shut the elevator down in the event of a mechanical failure. These include a machine break, an overspeed governor, safety brakes, buffers at the bottom of the hoistway, and multiple suspension cables. Depending on the type of elevator, they may also have electrical circuits that detect a door open or closed and relay that information to the controller. In some cases, these systems are also linked to a shut-down switch, which will cut power to the elevator when a fault occurs.
Gibs
The bottom of your elevator door has a number of devices that aid in its sexy vertical lift operation. The most common is the roller, which is attached to a pair of arms that move the door down the track. There are a few other components in the elevator door system that require periodic maintenance to keep them working at their peak efficiency.
The most important is the door Elevator Door System Parts lining itself which needs to be kept clean to avoid rust and corrosion. Keeping the door and its related equipment in tip top shape will not only save you money down the road, but it may also prevent an expensive call to the fire department or emergency room should something go wrong.
The best way to keep your prized possession in tiptop condition is to have a professional perform periodic inspections, including a gander at the gibs and rollers. This will help you spot potential problems before they become biggies. The best time to do this is around 20 years of use, when the elevator is at its most efficient and safest.
Frames
Frames play an important role in the elevator door system. They provide the framework for other parts, such as guide rails and cables. In addition, they help to ensure that the door opens and closes correctly and safely.
There are several types of frames in the elevator door system. They may be either welded or bolted together.
A common type of frame is the entrance door assembly, which has a frame that includes, viewed from the hallway, a left post, a right post and a top header connecting the left post to the top post (or a center post optionally). It also includes a transom panel, if desired, attached to the center post.
Another type of frame is the sliding entrance door assembly, which has a frame having (as viewed from the hallway) a left post, a right post, and a top header that connects the left post to the right post. It also has a transom panel and a stationary side panel positioned on one side of the frame.
This elevator entrance door assembly also has a sill and a slide sill (saddle). The sill is positioned on the floor between the left post and the right post. The slide sill is fabricated of metal with a slip resistant surface, and has a groove that defines a lower track for the sliding entrance door.
An exemplary method of installing an elevator system including door frames that each have a header member, a sill member and jamb members in selected locations along a selected wall of a hoistway involves securing guide rail brackets to at least one of the frame sill member, frame header member or the frame jamb member. The guide rail brackets are supported to the at least one of the frame sill member, the frame header member or the frame jamb member so that each of the brackets is arranged to receive a guide rail section in a desired position relative to the door frame.
The guide rail brackets are arranged to receive a first portion of the guide rail section that remains in a fixed position relative to the door frame. The guide rail brackets are also arranged to receive a second portion of the guide rail section that is moveable relative to the first portion of the guide rail section. The second portion of the guide rail section is movable so that it spans a gap or spacing between adjacent guide rail sections associated with adjacent door frames 30. When the second portion of the guide rail section is moved into position aligned with the corresponding first portion of the guide rail section, the guide rail brackets are automatically secured in place.
