Patent · US Expired

Closure device for a conveying unit operating in a vacuum

US5575596A · kind A · utility

31Cited by

3References

10Claims

0Family size

Assignee

Filterwerk Mann & Hummel GmbH · DE

Inventors

Michael Bauer · Unterföhring, DE
Otto Brandauer · Rochlitz, DE
Dieter Kemmler · Ludwigsburg, DE

Key dates

Filing date	Mar 24, 1995
Grant date	Nov 19, 1996
Priority date	—
Expiry date	Mar 24, 2015

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB65G53/24
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

A closure device for the discharge outlet of a bulk material conveying unit which operates under vacuum. The outlet has a circular cross-section, and the outlet opening of the conveying unit is closed by means of a freely movable closure element, particularly a ball. The closing effect is achieved by means of a vacuum in the conveying unit. In the open position, i.e. after the vacuum is switched off, the ball moves downward and rests on a supporting device and thereby forms an annular discharge outlet cross-section which is interrupted only by the struts of the supporting device.

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