Apparatus for use in variable operating temperatures
US5004095A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1989 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | May 9, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65G33/24
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Conveying apparatus for use in an environment having significant variations in temperature, and having a molded plastic screw conveyor on a metal drive shaft is disclosed. The molded plastic screw conveyor includes a non-circular axial aperture which receives a cooperating drive shaft with a coefficient of expansion different than the plastic screw conveyor. The cross-sectional shapes of the drive shaft and the axial aperture extending through the plastic screw conveyor are such that rotation of the drive shaft results in rotation of the plastic screw conveyor. However, axial motion between the plastic screw conveyor and the drive shaft can occur to accommodate variations in length due to changes in temperature. A journal plug or end means is also included which may receive rotational forces from a motor or other source. The journal plug is joined to the drive shaft such that rotation of the journal plug results in rotation of the drive shaft and consequently in rotation of the plastic screw conveyor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.