Single-lens reflex camera

Claim 1

PHOTOGRAPHIC SINGLE-LENS REFLEX CAMERA HAVING A SHUTTER MEANS, DIAPHRAGM MEANS, A FRAME AND A POVOTALLY DISPLACEABLE VIEWING MIRROR, WHICH COMPRISES A BASIC MEMBER OPERATIVELY CONNECTED TO THE VIEWING MIRROR, AND AN AUXILLARY MEMBER, STRAIGHT LINE PATH MEANS PROVIDED IN SAID FRAME HAVING TWO ENDS, SAID BASIC AND AUXILIARY MEMBERS BEING POSITIONED IN END-TO-END RELATIONSHIP ALONG SAID STRAIGHT LINE PATH MEANS AND BEING RESPECTIVELY MOVABLE ALONG SAID STRAIGHT LINE PATH, A FIRST SPRING MEANS CONNECTING SAID MEMBERS TO BIAS SAID MEMBERS TOWARD EACH OTHER, A SECOND SPRING MEANS CONNECTING SAID AUXILIARY MEMBER AND A FIXED POINT ON SAID FRAME AT A POINT REMOTE FROM SAID AUXILIARY MEMBER IN THE DIRECTION OF SAID BASIC MEMBER, AND A COCKING MEANS FOR DISPLACING SAID AUXILIARY MEMBER ALONG SAID PATH MEANS TO ONE END OF ITS MOVABLE RANGE, SAID FIRST AND SECOND SPRING MEANS BEING SIMULTANEOUSLY TENSIONED BY SAID DISPLACEMENT BY SAID COCKING MEANS AND SAID MEMBERS, MEANS TO RELEASE SAID BASIC MEMBER AND MEANS TO RELEASE SAID AUXILIARY MEMBER, SAID FIRST AND SECOND SPRING MEANS AND SAID BASIC AND AUXILIARY MEMBERS BEING SO RELATED THAT WHEN SAID BASIC MEMBER IS RELEASED SAID BASIC MEMBER IS MADE TO MOVE BY SAID FIRST SPRING MEANS TOWARD SAID AUXILIARY MEMBER IN ONE DIRECTION, AND WHEN SAID AUXILIARY MEMBER IS RELEASED SAID BASIC MEMBER IS MADE TO MOVE IN THE OTHER DIRECTION BY THE MOVEMENT OF SAID AUXILIARY MEMBER UNDER THE INFLUENCE OF THE SAID SECOND SPRING MEANS, THUS ACHIEVING THE RECIPROCATING MOTION OF SAID BASIC MEMBER AND ENABLING SAID MIRROR FOR VIEWING TO RISE AND FALL AND TAKE A PHOTOGRAPH.