Method and device for a lift
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
May 19, 2005
app pub date -
Oct 27, 2004
filing date -
Oct 30, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method of lowering a lift cage is provided for a motorised lift that has a device for releasing a motor brake included in a drive motor, an actuator operated from the lift cage that from its initial position can drive the brake release mechanism to an active brake release position and back to its initial position, and a catching device that stops the lift cage in case its descent should exceed a predetermined speed limit. For efficient regulation and control of the lowering speed the actuator is arranged to respond to a periodically repeated measure by being moved in a previously defined operating cycle controlled by a signal processing system to an active brake releasing position and then back again to its initial position, and the time it takes for the operating movement of the actuator within the operating cycle can be adapted to the downward acceleration of the lift cage when the motor brakes are released so that it has time to return to its original position before the lift cage has exceeded the predetermined speed limit.
First Claim
Other Claims data not available