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. 09, 2009
Filed:
Apr. 15, 2003
Richard Kulak, Bristol, CT (US);
Michael Tracey, Cromwell, CT (US);
Richard Kulak, Bristol, CT (US);
Michael Tracey, Cromwell, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
An elevator system includes a roller () having a hardness that varies responsive to a magnetic field (). The roller () rolls along a guide rail () to maintain a desired orientation of the elevator car (). In one example, the roller () includes a membrane () defining a generally annular chamber () containing fluid () that changes viscosity responsive to changes in the magnetic field (). The rollers () are associated with at least one magnetic field generator () that generates a magnetic field () of a selected strength. Varying the magnetic field varies the hardness of each roller () to control vibrations of the elevator car () to improve ride quality.