The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 1991
Filed:
Aug. 31, 1990
Frank Sansevero, West Hartford, CT (US);
Klaus Seehausen, Niedernwohren, DE;
James A Rivera, Bristol, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
The curved escalator has inner and outer step chains that are entrained on inner and outer sprockets which have different diameters, the outer sprocket having a larger diameter than the inner sprocket. The steps of the escalator reverse their direction of movement at the sprockets and pass from the passenger bearing run to a return run beneath the passenger bearing run. One of the sprocket sets is the power or driving set and the other is an idler set, which will be spring biased to maintain chain tension. In order to reverse the steps, they must tip or dip sideways because of the different sized sprockets. The dip zone of the roller tracks has an S curve to minimize noise and allow location of the track splice on the tensioned end of the escalator to be placed over the axis of rotation of the tensioned sprockets.