| 摘要 |
An escalator having a twin chain drive. Each chain (10, 11) comprises links (13) consisting of two side plates (14) interconnected by hollow sleeves (15, 23). The links are pivotally connected together to form a chain by linking plates (18) and pins (19) that are inserted through holes in the linking plates (18) and the bores of first hollow sleeves (15). A rotatably mounted load bearing roller (21, 29) is mounted on each sleeve (15, 23). Second hollow sleeves (23) are provided at spaced intervals along the length of the chains and have a bore that is provided with a double tapered surface (24, 25) that converges at a radial plane (26) midway between the side plates (14) of the respective link (13). An axle (20) is provided at spaced intervals along the chains and comprises a spindle (37) located in the tapered bores of the second hollow sleeve (23) of each chain and a spacer assembly (39, 39a, 39b, 39c) located between the pairs of second sleeves (23). Means (38) are provided for clamping the chains (11, 12) and said spacer assemblies (39, 39a, 39b, 39c) together axially thereby to hold the chains (11, 12) a predetermined distance apart. Abutting surfaces (40, 41) respectively of the second sleeves (23) and the spacer assemblies (29) are of complementary curved shapes that permit relative movement between the spacer assembly (29) and the second sleeves (23) whilst maintaining the alignment of the axis of each second sleeve (23) orthogonal to the sides of the links (14). The second sleeves (23) having a rotatable guide wheel (33) on at least one end of the axle (20). In use there is a guide rail (36) provided adjacent only one side of one of the chains wherein only one guide wheel (33) on each axle (20) locates on a said rail (36) to provide lateral restraint to the chains (11, 12).
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