Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people – By stairway having steps forming an endless member
Reexamination Certificate
2006-07-04
2006-07-04
Crawford, Gene O. (Department: 3651)
Conveyors: power-driven
Conveyor or accessory therefor specialized to convey people
By stairway having steps forming an endless member
C198S321000
Reexamination Certificate
active
07070038
ABSTRACT:
An escalator having a twin chain drive. Each chain10, 11comprises links13consisting of two side plates14interconnected by hollow sleeves15, 23. The links are pivotally connected together to form a chain by linking plates18and pins19that are inserted through holes in the linking plates18and the bores of first hollow sleeves15. A rotatably mounted load bearing roller21, 29is mounted on each sleeve15, 23. Second hollow sleeves23are provided at spaced intervals along the length of the chains and have a bore that is provided with a double tapered surface24, 25that converges at a radial plane26midway between the side plates14of the respective link13. An axle20is provided at spaced intervals along the chains and comprises a spindle37located in the tapered bores of the second hollow sleeve23of each chain and a spacer assembly39, 39a,39b,39clocated between the pairs of second sleeves23. Means38are provided for clamping the chains11, 12and said spacer assemblies39, 39a,39b,39ctogether axially thereby to hold the chains11, 12a predetermined distance apart. Abutting surfaces40, 41respectively of the second sleeves23and the spacer assemblies29are of complementary curved shapes that permit relative movement between the spacer assembly29and the second sleeves23whilst maintaining the alignment of the axis of each second sleeve23orthogonal to the sides of the links14. The second sleeves23having a rotatable guide wheel33on at least one end of the axle20. In use there is a guide rail36provided adjacent only one side of one of the chains wherein only one guide wheel33on each axle20locates on a said rail36to provide lateral restraint to the chains11, 12.
REFERENCES:
patent: 5295568 (1994-03-01), Saito et al.
patent: 5415265 (1995-05-01), Kubota
patent: 2 310 185 (1997-08-01), None
Caesar Rivise Bernstein Cohen & Pokotilow Ltd.
Crawford Gene O.
Deuble Mark A.
Precision Chains Limited
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