Patent · US Expired

Sifting machine

US4187171A · kind A · utility

1Cited by

6References

6Claims

0Family size

Assignee

Fried Krupp · DE

Inventors

Reinhard Hoffmann · Plockhorst, DE
Jurgen Hoffmann · Untersiggenthal, CH
Norbert Hoffmann · Winsen, DE

Key dates

Filing date	Aug 26, 1975
Grant date	Feb 5, 1980
Priority date	—
Expiry date	Aug 26, 1995

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB07B1/343
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A sifting machine includes a screen; a plurality of spaced leaf springs supported below the screen and extending transversely to the length dimension of the screen; and a drive connected to the leaf springs for causing each leaf spring to periodically bend away from the screen and subsequently move rapidly towards the screen to intermittently beat the latter. The active beating length of each leaf spring is somewhat less than the useful width of the screen. There are further provided a downwardly resiliently yielding support for opposite ends of the active beating length of each leaf spring and a cable or the like attached to the mid portion of each leaf spring. The cable forms part of the drive for agitating each leaf spring.

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