Platen cover
US4449811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1982 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Mar 8, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/6257
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a platen cover for a copying machine in which the bound volume copying platen is not used for sheet document copying. The cover includes a sheet document transport and handling mechanism with the cover having an independently liftable lid to provide access to the transport and handling mechanism. Substantially uniform counter-balancing of the cover, containing the transport and handling mechanism, or the lid alone, from the closed hold-down position to the raised stay-open position, is provided by a torsional helix spring positioned about the pivotal axis of the lid counterbalancing the lid, and a gas spring acting on the transport and handling mechanism through a lever arm about the same axis, counterbalancing the mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.