Handrails, stair rail systems, and guardrail systems are provided in accordance with § 1910.28; 1910.25(b)(2) Vertical clearance above any stair tread to any overhead obstruction is at least 6 feet, 8 inches (203 cm), as measured from the leading edge of the tread. outward. Risers shall be permitted to slope under the tread at an angle of 30 degrees maximum from vertical. 6. Coning of Wheels in Railways : Theory and Purpose Theory. The Surface of wheels are made in cone shape at an inclination of 1 in 20, and the same slope is provided in the rails (see fig), this is known as coning of wheels. It maintains the vehicle in the central position with respect to the track. Stair tread slope (out of level on walking surface) – (slope or “rise” must be <= 1 in 48) A walking-surface that provides a coefficient of friction of 1.02 dry and 0.98 wet will comply with ADA, OSHA, and most local building codes and insurance requirements. An adhesion railway relies on adhesion traction to move the train. Primary wheel restraining devices are secured to the support surface on outward sides of pairs of wheels of each road vehicle adjacent the thread surface of the wheels. Thus, in coning of wheel the tread or rim of wheels of railway vehicles is made in the shape of a cone with the slope of about 1 in 20. The tread of wheels is provided an outward slope of 1 in ___ Option A: 10 Option B: 15 Option C: 20 Option D: 25 Q5. Adhesion traction is the friction between the drive wheels and the steel rail. The slope of cone is: (a) 1 in 5 (b) 1 in 20 (c) 1 in 10 (d) 1 in 15. While I like the diamond tires aesthetically, I think the straight tread is a little closer looking to the no-tread Luftwaffe wheels. I've decided to use Robart Scale wheels with the straight tread, and ordered 3.5" for the mains, 2.5" for the nose. An outward slope provided on the tread of the wheel is: (a) 1 in 5 (b) 1 in 10 (c) 1 in 20 ... are coned to prevent from rubbing the inside face of the rail head and to prevent lateral movement of the axle with its wheels. The greater the tread angle the larger the portion of the weight that will be applied sideward. This sideways force is, in effect, trying to move the rail over. When a loaded wheel and tyre is compelled to roll in a given direction, the tyre carcass at the ground interface will be deflected due to a combination of the vertical load and the forward rolling effect on the tyre carcass (Fig. The distance that the wheel can stay in contact with the rail in the section with maximum flange angle during flange climb depends on the length of L0, wheel L/V ratio, and wheelset AOA. The permitted projection of the nosing shall be 1 1/2 inches (38 mm) maximum over the tread … 1995 CABO 314.2 allows a maximum 2% slope on stair treads themselves - this is the slope of the tread surface, not the slope of the stairway. A catcher tire abutment device is described for restraining road vehicles transported on a support surface of a transport vehicle. To help visualize this consider the taper of both of the wheels acting as a wedge to spread apart the rails. For this reason Oh, and the 2.5" diamond tread wheels appear to be out of stock everywhere. On straight track, portions of wheels running on track have the same diameter. The 1:48 (2%) max. I also agree that UBC 1003.3.3.5 applies. will also comply with the accessibility requirements of ICC/ANSI A117.1-1998. Ans:- B . Oh, and the 2.5 '' diamond tread wheels appear to be out of stock everywhere wheels in Railways Theory. Be permitted to slope under the tread angle the larger the portion of the weight that will applied! 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