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:
Aug. 11, 1992
Filed:
Mar. 13, 1991
Kurt Pietsch, Minden, DE;
Hans-Jirgen Langer, Hespe, DE;
Otis Elevator Company, Farmington, CT (US);
Abstract
The step chain rollers for an escalator or moving walkway are provided with an annular elastomeric tread mounted on the rim of the roller. The roller rim is formed with a recess or groove which receives the tread. The main body of the roller is metal, and the side edges of the roller contact a side part of the escalator roller track as the roller moves along the track. Lateral guidance for the step chain is thus provided. By recessing the tread in the roller rim, an increase in the metal-to-metal side contact zone between the roller and track is provided resulting in longer roller lift. The sides of the tread are preferably offset from the sides of the roller recess to allow crack-free expansion of the tread to occur.