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:
Feb. 10, 1998
Filed:
May. 08, 1996
Julio C Ramos, Lake Hiawatha, NJ (US);
Inventio AG, Hergiswil NW, CH;
Abstract
An apparatus and a method for controlling an elevator brake assembly (1) includes a control circuit (CM) for selectively connecting an electrical power supply (28) to a brake armature coil (9) to move an armature plate (4) between a brake actuated rest position against a brake friction lining (5) and a brake released hold position adjacent a brake housing (2). The control circuit (CM) applies a first voltage to the coil (9) to move the armature plate (4) against a force applied by a spring (3) from the rest position to the hold position in response to a signal on a brake pick signal line (BP). The control circuit (CM) applies a second voltage to the coil (9) to control the movement of the armature plate (4) by the spring (3) from the hold position to the rest position in accordance with a predetermined velocity versus distance curve to achieve minimum impact on the lining (5) at the rest position. A position sensor (11,12) is moved by the armature plate (4) to generate an actual position signal for adjusting the second voltage and a microswitch (10) is actuated by the armature plate (4) to signal the hold position. The control circuit (CM) self-calibrates by minimizing the position signal at the rest position and adjusting the velocity versus distance curve based upon the position signal at the hold position.