Retractable mirror means for cartridge-type motion-picture projector

Claim 1

A cartridge-type motion-picture projector comprising a frame, a cartridge supporting plate having a forward nonoperative position and a backward operative position, a film gate fixed to said frame having an aperture with its centerline parallel to said path of movement of said cartridge supporting plate, a light source on said frame projecting light in a general direction transversely of said path of movement to a location rearwardly disposed relative to said film gate, a mirror pivotally mounted on said frame for pivotal movement between an operative and nonoperative position in which the said mirror is disposed in and without the path of travel of the plate respectively, said mirror being biased in said operative position such that the forward end of said plate upon being displaced from said backward operative position to said forward nonoperative position contacts said mirror to automatically pivot the latter from its operative to its inoperative position, said forward edge of said plate upon the latter being displaced from said forward nonoperative position to said backward position being displaced from contact with said mirror whereby the latter is pivoted to said operative position by said bias.