Q20/The 600-kg industrial door is a uniform rectangularpanel which rolls along the fixed railD on itshanger-mounted wheels A and B. The door is main-tained in a vertical plane by the floor-mounted guideroller C, which bears against the bottom edge. Forthe position shown compute the horizontal sidethrust on each of the wheels A and B, which must beaccounted for in the design of the brackets.150 mm0.93 m0.9BAD3 m1.5 mDetail ofDoor HangerFig. 20

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