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US 4,374,558 AGranted
Steps of passenger conveyor
AssigneeHitachi, Ltd.
InventorCyuichi Saito
Life of this patent
Estimating the term…
Abstract
Steps of a passenger conveyor are designed to include a tread with a multiplicity of cleats and grooves disposed in alignment with teeth of comb plates at the entrance and exit areas. A riser is connected to one end of the tread and frames attached to other ends of the tread. The t read is formed of steel sheet and has cleats and grooves in the center and planar surface portions at the edges. Side pieces extending in the direction of movement of the steps are adjustably attached to the tread.
Claims4
Steps of a passenger conveyor each comprising:
- a tread formed with a multiplicity of cleats and grooves alternately disposed and extending in a direction of movement of the steps in alignment with teeth of comb plates mounted at embarkation and disembarkation areas of the passenger conveyor;
- a riser connected to one end of said tread;
- and
- a plurality of frames each attached to one of opposite ends of said tread;
- wherein the improvement comprises:
- reinforcing members interposed between said plurality of frames, said reinforcing members being joined by spot welding to an undersurface of said tread, said tread is formed of a steel sheet bent in such a manner so as to provide plannar steel sheet side edge surface portions with said cleats and grooves being located in a central portion of the tread between the plannar side edge surface portions said spot welding being effected by utilizing said grooves;
- and
- a plurality of side pieces disposed on said plannar side edge surface portions and extending in a direction of movement of the steps, said side pieces are transversely adjustably secured to said planar side edge surface portions by fastening means so as to enable a compensation of tolerance variations occuring during the bending of the steel sheet.
5 more elements
Dependencies are inferred from the claim text.