Patent · US Expired

Step riser profile for curved escalator

US5050721A · kind A · utility

3Cited by

21References

5Claims

0Family size

Assignee

OTIS ELEVATOR COMPANY · US

Inventors

Frank Sansevero · Glastonbury, US
Peter Borchers · Stadthagen, DE
Knut Wallbaum · Wunstorf, DE

Key dates

Filing date	Sep 11, 1990
Grant date	Sep 24, 1991
Priority date	—
Expiry date	Sep 11, 2010

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB66B21/06
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

An escalator which follows a curvilinear path with a fixed center constant radius in plan must have steps with specially configured risers. The step risers will have vertical cleats which mesh with trailing edges of adjacent steps, which meshing must be performed without risk of jamming. The escalator has an outer step chain which changes its effectual length over the path of travel of the escalator, whereby it is shorter in the inclined zone and longer in the landing zones of the escalator. The radii of the step risers, in elevation must thus decrease along the step riser cleats as the cleats descend away from the step tread.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.