™ "Overcomes Wind Velocity"

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Patent Number US 8,353,079 B2

"SmarTork™ Elevator Hoistway Door Closer saves money, energy, eliminates noise and increases profits for building owners and elevator supply companies."

SmarTork™ spirator employs a conical helix design that puts the cable closer to the center of the hub at the critical stage of the windup cycle, yielding greater tension for a given torque. The vulnerable point on existing spirators is that the torque tension ratio is in direct relation to each other. When the door is open, the spring is wound up to its tightest point, and the tension is at its highest, when the door closes the spring torque decreases as well as the tension on the cable. Obviously at the closing is where more tension is required.

In addition, over a period of time, this spring wears down and a mechanic is sent to “wind it up again.” This results in a loss of time and money for elevator companies and ultimately prompted the invention of the SmarTork ™.

Elevator hoistways are, in essence, wind shaft tunnels. Constant airflow creates great pressure in these wind shafts. The only escape for it is through the hoistway doors when they open and close. A door operator on the elevator cab opens them, but the closing of the exterior doors is assisted by a reel closure. This is the most vulnerable point with existing spirators. Air pressure rushes in and out trying to prevent closing which usually prevents proper latching of the interlocks and keeps contacts from matching up. The result of this is a broken safety circuit; thus, failure to the elevator system and operation. This is the number-one call-back in the industry today. SmarTork™ meets or exceeds ASME A17.1 and related codes. Read more about SmarTork™....