Types of elevators
We install, repair and maintain both hydraulic elevators and traction (roped) elevators.
Traditional overhead roped elevators have machine rooms which are situated directly above the elevator hoistway. While other traction elevator types like machineroomless (MRLs), have gained popularity, overhead traction elevators have some significant post construction advantages. With the key elevator equipment easily accessible, including controllers, elevator machines and braking systems, maintenance technicians can easily access for preventative maintenance.
While less frequent, in certain applications it makes sense to have the key traction elevator equipment in a basement machine room. Again, the advantage of this configuration over an MRL, is post construction where equipment is easily accessible to maintenance technicians.
Machineroomless (MRL) traction elevators have gained popularity in the past decade. Architects, in particular, appreciate this technology because the aesthetically displeasing machine room at the top of a building is no longer needed. The key elevator equipment is found inside the elevator hoistway. The disadvantage of MRLs is that much of the equipment is proprietary to the installing manufacturer leading to challenges post installation.
Traditional hydraulic elevator have an inground hydraulic cylinder that is attached below the elevator cab. The advantage to this technology is a quieter ride and the required hoistway size is smaller than a holeless hydraulic elevator where the cylinders are attached to the outside of the cab. The disadvantage of this technology can be high drilling costs (depending on the ground type such as rock) or difficult drilling due to water issues.
As the name suggests, a holeless hydraulic elevator does not require that a hole be drilled for the cylinder. Typically, a holeless hydraulic elevator will have cylinders that are attached to the outside of the elevator cab. The advantage to this technology is that contractors do not need to coordinate hole drilling very early in the building project, and ground type is not an issue.
MRL hydraulic elevators are a relatively new technology. With this technology the required machine room (which houses the hydraulic tank) is no longer needed because it is situated within the hoistway. The disadvantages of this technology is that the equipment is generally very proprietary and very difficult to access for maintenance, thus increasing maintenance costs.