Basic Identification of Passenger Elevator II


The hydraulic elevator or the “hydro,” comes in two basic styles. The rule of thumb here is that the piston will not be longer than five to seven stories in height. The piston has two styles, solid or telescopic, depending on what’s in the ground. The telescopic is used in areas with a shallow water table, tunnels below, ledge in the ground and things of that nature. The “pump” room can be next to the shaftway or many yards away and in some cases, even on different floors all together.

The freight elevator has five classes, but again for this article we will discuss the basics. A true freight elevator will usually be of the geared traction style. The doorway at the hoistway will have the tell tale signs of the vertical bi-parting doors.

The residential elevator, or “swing door” style, is what you would find in a commercial business. In some cases, the hoistway is built outside the building and in others, it’s added to the interior of the building. You can also find the “swing door” elevator in many high end homes. Some of these home elevators have the elevator interlock, while most do not.

Something to think about, responding to a home fire, you are searching in low or no visibility and you eagerly need to open a door, make sure that you sound for a floor. Because you could have forced open a basic house door that lead to an elevator shaft, which in turn could lead to a substantial fall. This shows the dangers of some homes with elevators that do not meet codes for safety standards for the elevator interlock.

Generally speaking, all updated and newly installed elevators will be compliant with the standards. I would bet that everyone has been in a compliant elevator at least once, but did not know it or really give it a second thought.

The machine room-less (MRL) elevator, as referenced in the beginning of the article is worded as “the new kid on the block,” but in reality these have been around for many years. These were designed to replace the “hydro.” The pros to this are lower insurance ratings due to the building owner not storing a few hundred gallons of flammable liquid in the building. The machine room takes up less area, meaning more rentable space for the building owner. The lack of hydraulic oil smell in the building and thus no over spill or broken lines to ruin anything in the building and that with no spills, is less chance of a worker or civilian slipping or falling, equaling no law suits. The other benefit is the system uses less power.

The cons to this unit is that it costs more for the installation and it is somewhat new, therefore, good installations and technicians are far and few between. The motor unit is made up of three electric motors with two being the main pulling power units and the third for heavier loads and for the use of lowering the car. The cables are replaced with belts. The unit is mounted on the rails just above the last upper floor served.

Now you should be able to identify the different types of passenger elevator. In the future, we will discuss ways to better understand the use of elevators at high rise alarms, fire,s and troubleshooting the call with stuck elevator cars.

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