| 摘要 |
PURPOSE:To travel and guide accurately smoothly a chain by providing an unified guide rail to fit and hold a connection between both side rails at the depth for slidably guiding the endless chain. CONSTITUTION:Upper and lower side rail frames 3, 4 mounted on the side of a stay 14, and projecting laterally parallel to each other from the deep wall 16 have recesses in which is received a guide rail 9 prevented from being dropped out by upper and lower lips 18 at a side opening 17 on the projecting end of the rail frame. Lugs 20 provided to project toward a chain roller portion 19 inside respective guide portions 6, 7 of both upper and lower sides of the guide rail 9 regulate the right and left positions of a chain 2 transfer path. The guide rail 9 received in the four frame surfaces of the upper and lower rail frames 3, 4 the deep wall 16 loated right and left and the lip 18 is automatically fitted and held in the upper, lower, right and left surfaces by the elastic force of the guide rail tending to expand. |
