Patent · US Active

Method of monitoring a chain pulley block and chain pulley block apparatus

US7422542B2 · kind B2 · utility

1Cited by

8References

18Claims

0Family size

Assignee

Demag Cranes & Components GmbH · DE

Inventors

Holger Freitag · Bochum, DE
Oliver Moll · Solingen, DE
Erik Appel · Wetter, DE
Ralf Eising · Bochum, DE
Udo Gersemsky · Herdecke, DE
Burkhard Hasenack · Hagen, DE
Anton Munzebrock · Dortmund, DE
Giuliano Persico · Wetter, DE

Key dates

Filing date	Aug 24, 2004
Grant date	Sep 9, 2008
Priority date	—
Expiry date	Jun 10, 2026

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB66D1/54
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

A method for monitoring a chain pulley block and a chain pulley block apparatus with an electric actuator motor (2) that is connected at the drive side to a transmission (7) across a sliding clutch (14). In order to achieve a safe operation of the chain pulley block, the speed of the transmission (7) is determined via a sensor (18), the determined speed of the transmission (7) is compared in a control device (19) to the operating speed of the actuator motor (2) as determined from rated duty of the actuator motor (2) and if a deviation is found between the speed of the transmission (7) and the operating speed, allowing for tolerances and any transmission ratio of the transmission (7), the actuator motor (2) is switched off.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.