| 摘要 |
A track support structure (30) for a sectional overhead garage door (10) having rollers (16) for guiding the door (10) between open and closed positions. The track support structure (30) has a track (38) and a track support beam (40). Track (38) has an upper horizontal flange (38) and a lower trough (72). The free edge of the trough (72) has an inturned tubular bead (74) and the free edge of upper flange (38) has an inturned tubular bead (74). An angle-shaped track support beam (40) has legs (88 and 90). The free edges of legs (88 and 90) have respective tubular beads (92 and 94). Tubular beads (92, 94) have a diameter between 1,5 and 2,5 times the diameter of beads (74, 76) on track (38). |
