Weight of Unit
Weight is a major factor, particularly if the evacuation equipment needs to be carried to the passenger, or simply removed from its securing location. Since the EVAC+CHAIR requires only one operator, the chair must be light enough to be lifted by a single individual yet strong enough to support the average passenger. The EVAC+CHAIR is only 18 pounds and has a carrying capacity of 330 pounds.
Ease of Transfer
An evacuation chair must be designed for easy transfer. People of reduced mobility may require assistance, thus the evacuation chair must be stable, low, open on both sides and provide passenger safety at all times by not moving during transfer.
Stability
The EVAC+CHAIR has an easy fold out two wheel trolley which allows for flat surface stability. Even with this stability, passengers should never be left unattended in any evacuation chair.
Speed and Control of Descent
An able-bodied person can descend stairs at normal walking pace at a rate of 2.46 feet per second. An evacuation chair should be able to match this without jeopardizing safety. The Evac+Chair can safely descend two flights of stairs in 15 seconds without blocking the stairs for other users by using the Egen Polymatic v-belt as a friction breaking device. This system uses gravity and the leverage of the operator to create friction and stop the chair. Some chair types have no friction and, therefore, no controlled speed of descent. Other devices require a cable brake and release mechanism. Virtually all cable brake mechanisms use the “dead man brake” principle and are either “on” or “off”; they do not provide a graduated increase or decrease of pressure experienced with a bicycle.
Restraints and Comfort
In emergencies, the passenger may not be conscious or have control. The seat pocket “cups” the body securely and the rider is strapped into the chair. The sliding head rest and padded back allow for passenger comfort. |
