Section 408.7054. Skirt deflector devices.

Section 6.1.3.3.10 of the ASME A17.1 code is amended to read as follows:

6.1.3.3.10 Deflector devices shall be permitted. Where  provided, deflector devices shall extend from skirt panels parallel to the escalator path of travel. Means to secure such deflector devices may be on the exposed surface of the skirt. All fasteners shall be of steel with machine  screw threads.  Any exposed fastener heads shall be of the  tamper-resistant  type and flush to within 1 mm (0.04 inch).

(1)     Rigid elements shall be in compliance with the following conditions:

(a)      Horizontal protrusions extending above the step shall be 18 mm (0.75 inch) maximum.  Corners or changes in profile shall be rounded or  beveled.

The exposed surfaces of such elements shall be smooth and permanently treated with a low-friction material.

(b)     On the incline, the area of any protrusion shall lie entirely  offset outward from a line beginning on the vertical portion of the skirt panel measured 25 mm (1 inch) vertically above  the  step  nose  line.   The  lower surface shall be beveled not less  than

10  degrees  upward   and  the  upper surface shall be beveled not less than 15 degrees downward in compliance with Figure 6.1.3.3.10 of the ASME A17.1 code.

(c)     At the upper and lower landing, any protrusion shall lie entirely above a line beginning on the vertical portion of the skirt panel 50 mm (2 inches) above the step nose line. The lower surface shall be beveled not less than 10 degrees upward and the upper surface shall be beveled not less than 15 degrees downward.  Any rigid elements at the landings shall smoothly blend into the rigid elements along the incline in accordance with the radius of curvature of the transition zone.

(d)     If attached to the skirt, rigid elements shall withstand a force of 900 N (200 lbf) perpendicular to the line of attachment of the element without detachment or permanent deformation. The force shall be applied to an area of 645 mm² (1 inch²).

(2)     Flexible elements shall be in compliance with the following conditions:

(a)     The horizontal protrusion extending from the skirt surface above the step shall be 50 mm (2 inches) maximum.

(b)      Shall be capable of deflecting to an angle of 10 degrees or greater above the horizontal protrusion.

(c)          Noncontinuous flexible elements shall be allowed to deflect to allow a maximum of 9.5 mm (0.375 inch) interference with any point on the step surface.

(d)     Continuous flexible elements shall not deflect such that they can contact the steps.

History: 2003 AACS; 2005 AACS.