Illuminated sign apparatus with arrow-shaped snap-in elements for covering arrow-shaped through-holes in a stencil

Abstract From the Canadian patent

An illuminated sign, such as an emergency exit sign, includes a stencil in which a pair of oppositelydirected, arrow-shaped through-holes are disposed. At least one arrow-shaped snap-in element is provided which is inserted into either of the through-holes to block the passage of light therethrough. The snap-in element includes elastic spring fingers having hookshaped ends adapted to engage a rear end of a ridge which borders a rear side of a respective through-hole thereby yieldably retaining the snap-in element within the through-hole. All of the spring-fingers are movable simultaneously through a respective through-hole.