Slidable control-knob for an apparatus particularly for a hair-cutter set

Claim 1

A CONTROL DEVICE FOR USE IN A DRY SHAVING APPARATUS COMPRISING A SHAVE HOUSING, A SLIDABLE CONTROL KNOB HAVING AN INVERTED HOLLOWED-OUT PORTION, AN INTERMEDIATE WALL PROVIDED WITH A HOLE THEREIN, SAID CONTROL KNOB BEING ADAPTED TO BE DISPLACED ALONG THE OUTER SURFACE OF SAID INTERMEDIATE WALL, A HAIR CUTTER BLADE HAVING AN OPENING THEREIN AND ADAPTED TO BE DISPLACED ALONG THE INNER SURFACE OF SAID INTERMEDIATE WALL, A SPRING IN SAID HOLLOWED-CUT PORTION OF SAID CONTROL KNOB, A CONNECTING PIECE DEPENDING FROM SAID SPRING AND DISPOSED SUBSTANTIALLY PERPENDICULAR THERETO, THE FREE END OF SAID CONNECTING PIECE BEING PROVIDED WITH MEANS WHICH PASSES THROUGH SAID HOLE IN THE INTERMEDIATE WALL AND ENGAGES IN THE OPENING OF SAID CUTTER BLADE WHEREBY IN THE MOUNTED POSITION OF SAID CONTROL DEVICE ON SAID SHAVER HOUSING, SAID MEANS ON THE FREE END OF SAID CONNECTING PIECE HAVING A SIDE SURFACE IN FLAT ENGAGEMENT WITH THE UNDERSIDE OF SAID HAIR CUTTER BLADE, SAID CONTROL KNOB ANDHAIR CUTTER BLADE ARE DRAWN TOWARD EACH OTHER AGAINST THE INTERMEDIATE BLADE ARE OF SAID HOUSING BY MEANS OF SAID SPRING.