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Table 8

Individual Trolley Loads at Vertical Curves Due to Chain Pull and Carrier Load (Equal Trolley Spacing)

Values of "C" for Various Rail Sizes & Radii
Rail Size	D	R	C
3"	4"	60"	56"
		72"	68"
		96"	92"
4"	6"	96"	90"
		120"	114"
		144"	138"
		192"	186"
6"	7"	144"	137"
		192"	185"
		240"	233"

S = Trolley Spacing in Inches

P = Chain Pull in Pounds

W = Total Weight Carrier & Live Load in Pounds

R = Radius to Centerline of I-Beam Track in Inches

D = Distance from Centerline of I-Beam Track to Centerline of Chain in Inches

C = Radius to Centerline of Chain in Inches (See Schedule)

T = Thrust Load on Trolley Due to Chain Pull = PS/C

Example Problem

Given:

4" I-Beam Track

S = 24 Inch

P = 640 Inch

W = 211.6 lbs.

R = 120 Inches

D = 6 Inches

C = 114 Inches

T = PS/C = 640x24/114 = 135 lbs.

Approximate Maximum Radial Load on Trolley = T + W = 135 + 211.6 = 346.6 lbs.*

Referring to Table 9, this is a safe load for a 4" trolley.

* This approximate solution is adequate in most application. For more accuracy use vector sum of T and W.