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:
Nov. 07, 1995
Filed:
Oct. 27, 1993
Wolfgang Muller, Meggen, CH;
Inventio AG, Hergiswil NW, CH;
Abstract
A self-propelled elevator car for vertical and horizontal travel in an elevator shaft has a plurality of driven friction wheels which are pressed against associated running surfaces by a passive contact force which produces the necessary friction and is influenced by a load-dependent gravitational force and an additional regulated active force. The friction wheels are rotatably mounted at free ends of guide arms having opposite ends pivotally connected to a lifting carriage attached to the bottom of the car. The guide arms extend downwardly and outwardly at a defined angle to the horizontal of a straight line between the pivot point and a contact point of the friction wheels with the running surface such that the gravitational force acting on the car forces the wheels outwardly. The active force can be applied by setting elements connected between the carriage and the guide arms. A force sensor mounted at the pivot point senses the passive force and is connected to a processor control which controls the active force applied by the setting elements in accordance with the value of the passive force.