Q20/The 600-kg industrial door is a uniform rectangular panel which rolls along the fixed rail D on its hanger-mounted wheels A and B. The door is main- tained in a vertical plane by the floor-mounted guide roller C, which bears against the bottom edge. For the position shown compute the horizontal side thrust on each of the wheels A and B, which must be accounted for in the design of the brackets.

Q20/The 600-kg industrial door is a uniform rectangular panel which rolls along the fixed rail D on its hanger-mounted wheels A and B. The door is main- tained in a vertical plane by the floor-mounted guide roller C, which bears against the bottom edge. For the position shown compute the horizontal side thrust on each of the wheels A and B, which must be accounted for in the design of the brackets.