Patent · US Expired

Safety device for a door system

US4803807A · kind A · utility

11Cited by

1References

9Claims

0Family size

Assignee

Messerschmitt Bolkow Blohm GmbH · DE

Inventors

Horst Stockermann · Sauerlach, DE
Herman Bohm · Augsburg, DE
Josef Grober · Munich, DE
Wolfgang David · Aachen, DE

Key dates

Filing date	Jul 10, 1987
Grant date	Feb 14, 1989
Priority date	—
Expiry date	Jul 10, 2007

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE05Y2900/531
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

To provide, for a sliding door with a pneumatically operated door panel servomotor, a safety device which operates independently of the usual reversing device and which limits the maximally active door closing force to an exactly settable value in a simple and reliable manner, there is associated with the servomotor, a limit value control circuit with a closing force sensor which senses the reaction force of the servomotor acting on the door jamb side during the closing process and a sensor-controlled three-position control valve which freely vents the closing pressure side of the servomotor above a given response value of the closing force sensor.

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