Shutter system for stage-lighting spotlights
AssigneeElectro Controls Inc.
InventorJoseph H. Labrum
Life of this patent
Estimating the term…
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.
Claims10
A shutter system for stage-lighting spotlights comprising a housing;
- a fixed framing gate in said housing having an opening therein for the passage of light;
- two sets of opposing slots in said housing, one set located on each side of said framing gate;
- two sets of opposing shutter blades, each set of blades being associated with a set of slots and each shutter blade having a neck portion thereof extending through one of the slots of its associated set of slots and being adapted to be moved into or out of the open portion of said framing gate to restrict to any desired degree the size of the opening through which light passes;
- two pressure plates, one on each side of said framing gate and each having a central opening corresponding to said opening in the framing gate, each set of shutter blades being sandwiched between a pressure plate and said framing gate so as to hold the respective pressure plates separated from the framing gate by spaces corresponding to the thickness of a shutter blade;
- and means located completely outside of said spaces for resiliently and constantly urging the pressure plates toward said framing gate so that the shutter blades are held securely in place between the pressure plate and framing gate but are movable under force applied to the blades.
Dependencies are inferred from the claim text.