Shutter system for stage-lighting spotlights
US4210955A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1978 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Sep 20, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2131/406
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A shutter system for stage-lighting spotlights includes a housing having a fixed framing gate therein which has an opening therethrough for the passage of light. Two sets of opposing shutter blades are sandwiched, one on each side of the framing gate, between the framing gate and one of a pair of pressure plates which have means urging them toward the framing gate. Each shutter blade has a neck portion which extends through a slot in the housing and which serves as a handle to which pressure may be applied to move the shutter blade. The blades are normally held in place by the action of the pressure plates against the blades and framing gate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.