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Truss and girders.
9.
Tracks for wheels of stairs.
Factors of safety.
Ventilation
of space in which driving utachinc, etc.
installed.
The truss or girder of every escalator shall be- (a) of sufficient strength to support the stairs and running gear of
the escalator when the same are in use; and
(b) such that, in the event of any failure of the track in which the running gear operates, it will retain such gear in the guides provided therefor,
10. The tracks, in which the wheels of the stairs of an escalator shall be so designed as to prevent such stairs or the running gear from becoming displaced in the event of the breaking of a step chain,
rud.
11. (1) The factor of safety for all structural members of every escalator shall be not less than five.
(2) The factor of safety for every part of the driving machine of every escalator shall-
(4) if such part is constructed of steel or bronze, be not less than
cight; and
(b) if such part is constructed of cast iron or any other material,
be not less than ten.
(3) The factor of safety for the power transmission members of every escalator shall be not less than ten.
(4) The factor of safety shall, in every case, be based on the static load.
12. (1) Any space in which the driving machine or controls of any escalator are installed shall be ventilated by means of a vent.
(2) The area of any such vent shall not exceed two square feet,
13. (1) Any space in which any machinery provided for an of machinery escalator is installed shall be provided with adequate artificial lighting.
Dlumination
Spice.
Escalator to have balustrade.
Balustrade to bave hand
tails.
Prohibition of glass panels is balustrade.
(2) The switch by which such lighting is operated shall be situated adjacent to the door provided to give access to such space.
14. Every escalator shall be provided, on each side of the stairs thereof, with a solid balustrade which shall, on that side facing the stairs of the escalator, be smooth and substantially without projections
15. Every such balustrade shall be provided with a hand rail which shall be so designed as to move in the same direction and al substantially the same speed as the escalator.
16. No such balustrade shall have any glass panels therein.
escalator between
17. (1) Subject to the provisions of paragraph (2), the width width of between the balustrades of any escalator shall, at a level twenty-seven inches above the nose line of the tread surface of the stairs of the balustrades. escalator, be not less than twenty-two inches nor more than forty-eight inches.
(2) The width at such level shall not, in any case, exceed the width between the balustrades, at the level of the tread surface of the swairs, by more than thirteen inches.
18. (1) Every stair of an escalator shall be such that the width, Stairs, in the direction of travel, from the face of one riser to the face of the next riser, is not less than fifteen and three quarter inches.
(2) The rise of any such stair shall be not more than eight and a half inches.
(3) The width of any such stair shall be not less than sixteen inches.
(4) The clearance between every two such stairs shall be such that, on the horizontal run thereof, the distance between them is not more than five-thirty-seconds of an inch.
19. (1) The stairs of every escalator shall be illuminated through- Olumination out their travel.
(2) The intensity of the light on the tread surface of the stairs shall be not less than five lumens per square foot.
of stairs.
30. (1) The tread surface of every stair of an escalator shall be Tread surface slotted in a direction parallel with the direction in which the escalator of stairs to travels.
be slotled, cle
(2) Every such slot shall be not more than a quarter inch in width and not less than three-eighth inch in depth, and the distance from centre to centre of adjoining slots shall be not more than three-eighth inch.
21. (1) There shall be provided, at the entrance to and exit from Combplates, every escalator, a combplate.
(2) Every such combplate shall be such that-
(a) it is adjustable both horizontally and vertically; and
(6) sections forming the same are readily removable in case of
emergency.
(3) The teeth of every combplate shall be so meshed with and set into the slots of the tread surface of the stairs of the escalator that the points of such teeth are always below the upper surface of such tread surface.
12. No escalator shall bave an angle of inclination exceeding 30° Angle of from the horizontal.
inclination.