Anti-backlash means for adjusting enlargers
US4066356A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Oct 7, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1967
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An anti-backlash means, particularly adapted for photographic enlargers including a channel shaped optical bench having a pair of guideways; a frame movable along the guideways, having a pair of tracks, a pair of rack elements, and leaf springs supporting the rack elements in continuous relation; a gear rotatably supported by the optical bench including a pair of gear elements engageable with the rack elements, and wheels riding on the tracks to maintain a fixed minor spacing between the pitch plane of the rack elements at the pitch radius of the gear elements; either the gear elements or the rack elements having offset teeth to eliminate backlash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.